Journal of East China Normal University(Natural Science)

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Phytoremediation of heavy metals and rhizosphere detection of bacteria in a drainage river sediment

WANG Lei， QI Pei-shi， XIN Ming

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 1-10, 36.

Abstract （3086）

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Concentrations of heavy metals (Pb, Zn, Cr, As, Ni, Cu and Cd) in a drainage river sediment were determined from the industrial area of Harbin city in Heilongjiang Province. Pot experiment was conducted to evaluate the potential of four spontaneous plants, 〖WTBX〗Zea mays 〖WTBZ〗L., 〖WTBX〗Polygonum lapathifolium 〖WTBZ〗L., 〖WTBX〗Solanum nigrum〖WTBZ〗 L. and 〖WTBX〗Rumex patientia〖WTBZ〗 L. for heavy metals phytoremediation in the drainage river sediment contaminated with industrial effluent. The results revealed that the sediment was polluted by heavy metals. The contents of residual fractions of the 7 heavy metals decreased, while the Fe-Mn oxide fractions and exchangeable fractions consistently increased via two-season cultivations. Sequential extraction results confirmed the capability of the four plants to increase the bioavailability of these heavy metals. The concentrations of heavy metals in sediments and plants were in the same trend: Zn＞Pb ＞Ni＞Cr＞Cu＞As＞Cd, which reflected the biomonitoring potentialities of the tested plants. The heavy metals accumulations and translocations of the four plants were investigated. The results showed that the plants accumulated more Zn and Ni than the other metals; and the concentrations of Cu in shoots were low. Zinc and Ni levels in plant samples ranged from 108.4 mg/kg in shoots to 543.92 mg/kg in roots and 36.8 mg/kg in shoots to 246.91 mg/kg in roots of different species, respectively. Generally, the four species excluded multiple metals from the shoot tissues and accumulated in root zones, behaving as tolerant plants. However, polygonum lapathifolium L., Rumex patientia L. and Solanum nigrum L. showed high Pb, Zn and Cd shoot accumulation with high metal translocation factor (TF>1), respectively. It suggested the three species had phytoextraction potentialities. In addition, florescence in situ hybridization (FISH) was used to analyze the amount and distribution of bacteria in the rhizosphere sediment. It suggested the four plants have effect on bacterial activations.

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Influence of nitrogen and phosphorus concentrations on the growth characteristics of Microcystis aeruginosa

ZHENG Xiao-yu, JIN Yan, REN Xiang-yu, GU Yong-jie,ZHU Yong-qing, YANG yi-fan

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 11-18.

Abstract （2983）

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Microystis aeruginosa was cultured in solutions of different initial nitrogen and phosphorus concentrations. The semi-saturation constants (Ks) of Microystis aeruginosa to P and N were calculated respectively by using the Monod equation. The results show that the Microystis aeruginosa grew normally when the concentrations of N and P were greater than 4.0 mg·L^-1 and mg·L^-1 respectively. The optimum concentration ranges of N and P for Microystis aeruginosa growth were 32.0~64.0 mg·L^-1 and 1.0~1.50 mg·L^-1 respectively. Ks_N is higher than Ks_p, which indicates that the affinity of P to Microystis aeruginosa is higher than N. When the concentration ranges of N and P were 0.20~64.0 mg·L^-1 and 0.02~1.50 mg·L^-1 respectively，they had high liner correlation with the largest extent quantity of Microystis aeruginosa. The special growth rate increases continuously when the concentration ranges of N and P are 0.20~1.60 mg·L^-1 and 0.02~0.50 mg·L^-1respectively.

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Experimental study on the adaptability of juvenile Myxocyprinus asiaticus to the estuarine waters

WANG Feng-yi, LU Jian-jian

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 19-26.

Abstract （2107）

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The adaptability of juvenile Myxocyprinus asiaticus to the estuarine waters was experimentally studied by investigating the survival ratios, the superoxide dismutase (SOD) activities in its' liver, the Na⁺/K⁺-ATPase activities response in its’ gill to different salinity stresses and joint stresses of nitrate and phosphate. The result showed that, the survival was 100% when the salinity was below 10.There were not significant differences of the SOD activities and the Na⁺/K⁺-ATPase activities between salinities 3 and 0 （p>0.05）, respectively. The survival was 100% when the water quality was better than Ⅳ. The SOD activities and the Na⁺/K⁺-ATPase activities in water quality Ⅳ was higher than that in Ⅱ and Ⅲ (p<0.05). In conclusion, juvenile Myxocyprinus asiaticus have strong adaptability when the salinity is below than 3 and water quality is superior to Ⅲ, and that means that the current environmental situation at the upper section of Yangtze Estuary can provide juvenile Myxocyprinus asiaticus with adaptive water quality to live.

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Chlorinity distribution and water intake operation of the Chenhang Reservoir during saltwater intrusions in the Yangtze Estuary

SHEN Yi-chen, LI Lu, ZHU Jian-rong

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 27-36.

Abstract （2179）

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In order to supply water during severe saltwater intrusions in the Yangtze Estuary, the Chenhang Reservoir sometimes took brackish water. The chlorinity in the reservoir was measured during November 27 in 2009 to March 12 in 2010. Combined with the river discharge, water level, wind stress, chlorinity at the upstream station and its inlet，the saltwater intrusion in the estuary, the way of water intake operation, and temporal/spatial variations of the chlorinity in the reservoir were analyzed. The simulated results showed that, the upstream was tended to be present around its eastern coastline under westward wind. Before the brackish water reached the reservoir, the amount of the water intake was increased to make it to high water level. At the beginning of a saltwater intrusion, the reservoir took the brackish water to keep its higher water level. In the later of the saltwater intrusion, some freshwater was taken from the Baogang Reservoir and the amount depended on the intensity of saltwater intrusion. Furthermore, the water intake from the Yangtze River must be paused when the chlorinity at the supply outlet in the reservoir was close to 250 mg/L. The measured data indicated that the chlorinity of the reservoir was increased when the brackish water in-taking was conducted and experienced a spatial variation under different wind stresses. The water intake operation of the Chenhang Reservoir was dependent on the chlorinity inside/outside it. In addition, its water level, the chlorinity in its upstream as well as the wind stress should also be taken into account. This study can bring experience to the reservoirs built in estuaries for better operation.

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Modeling of seawater reflectance in the Yangtze Estuary and the adjacent sea

HONG Guan-lin, SHEN Fang, SHEN Hong

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 37-46.

Abstract （2916）

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The optical properties of the Yangtze Estuarine waters were discussed based on two investigations conducted respectively in August and November of 2009. It was found that the water-leaving reflectance spectra in August and November presented four types caused by different chlorophyll-a concentrations, suspended sediment concentrations and colored dissolved organic matters (CDOM). The relationships between chlorophyll-a concentration and absorption coefficient of the pigment particles were built by two ways, and two models used to simulate the reflectance spectra were established by using the parameterized optical properties, the RMSE of these models being 0.004 4 and 0.004 5, respectively. The accuracy of the model can be improved by classifying the concentrations of chlorophyll-a and suspended sediment, the RMSE was improved to 0.003 5.

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Long-term potentiation of prefrontal cortex in NR1 knockout mice

YANG Li-guo, ZENG Qing-wen, ZHANG Xu-liang, CAO Xiao-hua

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 47-53.

Abstract （2800）

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This study investigated the prefrontal synaptic plasticity of forebrain-specific NR1 knockout mice by using the vitro field potential recording technique. The results from the input-output and paired pulse depression curves suggest that the basal synaptic transmission is normal in the prefrontal cortex of NR1 knockout mice. Prefrontal long-term potentiation (LTP) induced by high frequency stimulation (two trains of 100 Hz with 1 s duration and 30 s interval) was abolished in slices of NR1 knockout mice. These results indicate that NR1 is critical in the induction of long-term potentiation in prefrontal cortex.

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βCaMKII overexpression impairs long-term depression in dentate gyrus of mice

XU Hao, WANG Bo, DUAN Yan-hong, CAO Xiao-hua

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 54-62.

Abstract （2585）

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This experiment was designed to investigate the effects of the βCaMKII on the long-term depression (LTD) in dentate gyrus（DG）by using the transgenic mice in which the overexpression of βCaMKII is restricted to the DG area. Compared to the control group, the paired-pulse depression curve and voltage-current response in DG of transgenic mice didn’t change, but the LTD was significantly reduced. These results suggest that overexpression of the βCaMKII may impair the long-term depression without effect on the presynaptic function and passive properties of granule cells in DG area.

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$\lambda$ point and $\lambda$ property in generalized Orlicz spaces with Luxemburg norm

SHI Zhong-rui, ZHAI Jia-yu

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 63-73.

Abstract （2204）

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In this paper, we gave the sufficient and necessary conditions of $\lambda$ point in a generalized Orlicz function space equipped with the Luxemburg norm, by methods used in classical Orlicz spaces and new methods introduced especially for generalized ones. The results indicate the difference between points in the unit balls of classical and that of generalized Orlicz spaces: all of the classical spaces are $\lambda$ points, but some of the generalized spaces are not. Finally, we gave the criteria of the $\lambda$ property and the uniform $\lambda$ property of generalized spaces.

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System of variational inclusions with ${(\emph{\textbf{H}},{\bm\phi})}$-$\bm\eta$-monotone operators in Banach spaces

ZHANG Chao

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 74-83.

Abstract （2806）

PDF （202KB）（2268）

This paper introduced a new system of variational inclusions with $(H,\phi)$-$\eta$-monotone operators in real uniformly smooth Banach spaces. By using the proximal mapping technique associated with $(H,\phi)$-$\eta$-monotone operators, we proved the existence and uniqueness of solution for this new system and construct a new iterative algorithm for approximating the solution of this system. The convergence of the iterative sequence generated by the iterative algorithm was also discussed. The results extend and improve some known results in the literature.

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A graph \emph{G} is said to be \emph{determined by its spectrum} if any graph having the same spectrum as that of \emph{G} is isomorphic to \emph{G}. In this paper, it was proved that $K_{n}-E(lP_{2}) $ and $K_{n}-E(K_{1,l})$ are determined by their spectra, respectively.

WU Ting-zeng, HU Sheng-biao

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 84-87.

Abstract （2279）

PDF （162KB）（2145）

A graph \emph{G} is said to be \emph{determined by its spectrum} if any graph having the same spectrum as that of \emph{G} is isomorphic to \emph{G}. In this paper, it was proved that $K_{n}-E(lP_{2}) $ and $K_{n}-E(K_{1,l})$ are determined by their spectra, respectively.

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Proofs and applications for a combinatorial identity

SHI Jian-yi, WANG Wei

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 88-96.

Abstract （2417）

PDF （408KB）（2185）

This paper considered a combinatorial identity related to some combinatorial enumeration problems involving the number $n^{n-2}$. The identity was proved in three different ways, which were in the theory of functions of complex variables, in graph theory, and in combinatorics, respectively. Finally, the identity was applied to enumerate certain kind of graphs and also the admissible sign types of type A.

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Property of an orthogonal projection matrix

DU Kun, GU Gui-ding

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 97-99.

Abstract （7849）

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In this paper we showed that for an orthogonal projection matrix with rank $k$, there exists an principal submatrix with order $k$ of the matrix, such that its Rayleigh quotient has a positive lower bound. The proof was made by using the relation of the singular values, eigenvalues and norm of matrices, as well as the properties of unitary matrix and compound matrix.

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Prolongation structure of the coupled nonlinear evolution equation

JIA Yang-jie

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 100-105.

Abstract （2218）

PDF （238KB）（2273）

The coupled KdV equation proposed by is investigated in the framework of prolongation structure theory. Its Lax representation of prolongation algebra is constructed.

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Subspace-supercyclicity and common subspace-supercyclic vectors

ZHAO Xian-feng, SHU Yong-lu, ZHOU Yun-hua

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 106-112, 120.

Abstract （2446）

PDF （247KB）（2999）

A bounded linear operator $T$ on Banach space is subspace-supercyclic for a nonzero subspace $M$ if there exists a vector whose projective orbit intersects the subspace $M$ in a relatively dense set. We constructed examples to show that subspace-supercyclic is not a strictly infinite dimensional
phenomenon, and that some subspace-supercyclic operators are not supercyclic. We provided a subspace-supercyclicity criterion and offered two necessary and sufficient conditions for a path of bounded linear operators to have a dense $G_\delta$ set of common subspace-hypercyclic vectors and common subspace-supercyclic vectors.

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Oscillations of a class of third order nonlinear neutral functional differential

HAN Zhong-yue

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 113-120.

Abstract （1983）

PDF （190KB）（2407）

The oscillations of a class of third order nonlinear neutral functional differential equations was discussed, by using the generalized Riccati transformation and the integral averaging technique; and some new sufficient conditions for oscillations or tends to zero of all solutions of the equations were obtained. The
example to illustrate the main results were given. The results extend and improve some known results.

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Numerical solution of a non-arbitrage liquidity model based on uncertain volatility

NIU Cheng-hu, ZHOU Sheng-wu

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 121-129, 137.

Abstract （2280）

PDF （546KB）（2308）

The option pricing model in illiquidity markets was expanded to general situations by introducing two kinds of uncertain volatility models. As it is difficulty to get analytical solutions for the model in complicated cases, a numerical solution was discussed by establishing corresponding differential equations; and the stability and consistency of the sdution were proved. Finally, the influence of some parameters to the solution was provided in numerical examples. The results show that the algorithm reduced the restriction on step-length requirements, and satisfactory approximation can be found with less computation.

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One-dimensional BSDEs with monotonic, H\"{o}lder continuous and Integrable parameters

XIAO Li-shun,LI Hui-ying,FAN Sheng-jun

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 130-137.

Abstract （2137）

PDF （228KB）（2392）

This paper established a new existence and uniqueness result for solutions to one-dimensional backward stochastic differential equations (BSDEs) with only integrable parameters, where the generator $g$ is monotonic in $y$ and $\alpha$-H\"{o}lder ($0<\alpha<1$) continuous in $z$. By Tanaka's formula and Girsanov's theorem we established a comparison theorem for solutions in $L^1$ to BSDEs, from which the uniqueness follows. By convolution technique we obtained a uniform approximation sequence of the generator $g$ and then constructed a sequence of solutions in $L^1$ for BSDEs. Finally, we proved the limitation of this sequence of solutions is the desired solution. This proved the existence.

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Singular perturbation of BVP for third-order nonlinear VDE

LIN Su-rong, NI Ming-Kang

Journal of East China Normal University(Natural Sc 2012, 2012 (1): 138-150.

Abstract （2555）

PDF （354KB）（2101）

The singularly perturbations for the vector boundary value problem of nonlinear third-order ordinary differential equations were studied. Under certain conditions, the given differential equation was transformed into a diagonalized system, and then the equivalent integral equations was solved. By using the method of succesive approximation and the theorem of fixed point, the existence of the solution of singular perturbation problem was proved and the asymptotic estimation was obtained. Finally, several examples of application were given.

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Innovative e-Learning: information technology and standards, a current and future perspective

B. E. PEOPLES

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 1-12.

Abstract （2281）

PDF （360KB）（2356）

We are living in extraordinary times. Emerging Information Communication Technology (ICT) is ushering in a new age of a “shared knowledge society” on a global scale. But what does a “shared knowledge society” mean? How does the incorporation of emerging ICT allow our global society to evolve and in what ways? How can we describe the unique blend of technologies allowing this dynamic transformation? What ICT emerging components are important in allowing us to effectively communicate and learn on a global scale? What standards are needed to support the implementation of these ICTs in allowing our global civilization to evolve into a “shared knowledge society”? In this paper, we’ll explore how our global society is evolving e-Learning through the use of ICT, look at a few key current and emerging technologies involved, and related emerging standards.

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Using industrial digital assets to build learning environments: a new approach to serious gaming

B. BLANDIN

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 13-24.

Abstract （2325）

PDF （2086KB）（2170）

In this paper, I present a vision of a new approach to develop serious gaming applications. This approach is currently supported by some French Higher Education and Training Institutions and by a major provider of Product Lifecycle Management solutions, simulation and CAD systems for industries. This paper will introduce the proposed concept, and present the questions raised by the development of the concept and the responses the consortium can provide so far. The conclusion opens discussions about potential developments or extension of this project.

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Problematizing the way we do standards: focussing more on scope and rationale

T. HOEL, J. MASON

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 25-34,41.

Abstract （2168）

PDF （372KB）（2390）

This paper brings together two perspectives on current developments in information and communications technology (ICT) utilized for the purposes of learning, education, and training (LET). One perspective is concerned with governance and legitimacy issues regarding the process and relevance of standards development; the other, is concerned with the role of discerning relevant questions in LET and the potential scope for innovation that might develop tools to support such discernment. Discussion of information systems architecture is introduced as a means to set the context and provide a framework for bringing together an overall narrative and coherence to these two perspectives. Questions initiated by “why” are of particular interest because they typically demand an explanation in natural language to satisfy the questioner. By focusing on “why” as a key “primitive” of enquiry the authors present an approach that might inform improved processes of ICT for LET (a.k.a ITLET) standardization.

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Inclusive learning:OER and cloud services

Jutta TREVIRANUS, Erlend VERBY

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 35-41.

Abstract （2373）

PDF （256KB）（2111）

For many years the promise of technology-enabled education has been the potential to adapt the learning experience to each individual learner. If an IT-enabled learning environment is aware of each learner’s learning preferences, the learning environment can potentially supply each learner with an individually optimized learning experience. The aggregation capabilities of cloud services, intelligent systems that transform, augment and replace resources with more suitable equivalents, combined with federated repositories of sharable, appropriately designed and labelled resources make this possible. However to achieve this we need a new take on how we view, produce and deliver educational learning resources.

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Research on the standards for the Internet of Things in education

FENG Xiang， JIANG Xin， WU Yong-he

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 42-51.

Abstract （3481）

PDF （799KB）（3925）

This paper introduced the concept and history of the Internet of Things and analyzed its application in education and proposed research ideas. Based on the perspective of a typical three-tier, collection of the standards and key technology were summarized . Finally, combining the features and application mode in education, we summarized the metedata of intelligent educational terminals and established uniform standards. The results will be useful to educational service industries.

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Using ArchiMate to design learning environment architectures

W.G.KRAAN

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 52-69.

Abstract （2242）

PDF （2682KB）（2070）

A desire to customise and personalise learning experiences, combined with the rise of a number of new tool integration technologies has led to a move away from monolithic Virtual Learning Environments (VLEs; a.k.a. Learning Management Systems, ‘LMSs’) towards more open and Distributed Learning Environments (DLEs). The various DLE architectures can have very different properties, however, and choosing between them can be difficult.The Open Group’s ArchiMate standard may help in that regard. It was designed to facilitate communication about architectures between all stakeholders in an organisation. It is a visual language that aims to help conversations about IT systems, business processes, organisational structure and strategy. This paper will present a number of DLE patterns that illustrate the range of possible architectures. Both the potential of these patterns as well as the utility of the ArchiMate language in explicating them will be evaluated.

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Research on the framework of specification for e-Textbook and e-Schoolbag

WU Yong-he， ZHU Zhi-ting， HE Chao

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 70-80.

Abstract （5454）

PDF （2795KB）（4879）

With the development of information technology, the e-Textbook and e-Schoolbag is received more concerns from the community, its promotion and popularization is becoming the trend. First, this paper analyzes the demand of e-Textbook and e-Schoolbag from perspective of research on framework of standards. Then it describes the framework of e-Textbook and e-Schoolbag, including conceptual model, system framework model, hierarchy diagram for e-Textbook and e-Schoolbag system and function model. At last, it gives architecture of standards for e-Textbook and e-Schoolbag and profiles of related standards for e-Textbook and e-schoolbag.

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Connecting reading and learning: design of the information model of e-Textbook

GU Xiao-qing, FU Wei, QI Gui-chao

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 81-90.

Abstract （3533）

PDF （1053KB）（3051）

With the development of personal digital terminal and the popularity of e-reading, “e-Schoolbag” has once again become a hot topic in the field of e-Learning. In this paper, we firstly analyze the demands of e-Textbook in the instrunction context, and then proposed the design of e-Text book information model which aims at connecting reading and learning, and hopefully to guide the design and developmentof e-Learningtextbooks.

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Design of the technical specification for e-Schoolbag terminal

QIAN Dong-ming, GUAN Jue-qi, GUO Wei

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 91-98.

Abstract （4046）

PDF （832KB）（3828）

With the development of information technology, e-Schoolbag has become a popular research and application field in digital education. Through the evolution of concept, the change of attention and the development of education, the paper gives a new understanding of e-Schoolbag and focuses on the design of the technical specification for e-Schoolbag terminal. On the basis of the research situation in domestic and international, it concerns for the usage of users, security of applications, reliability of terminal, universal design and builds technical specification for e-Schoolbag terminal from the three aspects of terminal hardware, operating system and instructional function. Finally, from the perspectives of manufacturer, related industry with e-Schoolbag and the reform of education, it gives the forecast of the significance of technical specification for e-Schoolbag terminal.

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Research on the workflow standards for virtual experiment systems

XUE Yao-feng, WU Yong-he, WU Di, JIANG Wen-bin

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 99-105.

Abstract （2170）

PDF （1246KB）（2379）

This paper researches on the structure description problem of workflow of a virtual experiment system (VER). It also defines the information model and the interface standard of workflow of VER. The detailed work procedures and operation cases of VER are presented. It will give the valuable references for researchers and developers of VER.

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On the research and implementation of the multi-domain virtual experiment standard framework

WU Di, XU Jian, ZHANG Cheng-wei

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 106-114.

Abstract （2866）

In this paper, a new multi-domain virtual experiment standard framework is introduced, which provides a general framework to support the standardization of virtual experiment teaching, learning and management. To make it possible for multi-domain application, the standard framework’s structure is designed based on multi-domain modeling concepts and general e-Learning standards.

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Competences and skills for learning-outcome orientation: competence development, modelling, and standards for human resources development, education and training

Christian M. STRACKE

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 115-130.

Abstract （2619）

PDF （1449KB）（2175）

This paper will summarize the potential use cases and impacts of competences and skills in the new area, often called “Digital Age”: It will highlight the roles and benefits of standards and metadata for HR development and points out the special support that competence models can provide for the quality development in learning, education, and training. In this regard, the main characteristics of this innovative approach called competence modelling and its relevance in vocational education and training (VET) can only be summarized. A general competence model with a standardized competence structure and taxonomy of levels is introduced and discussed for the general application scenarios and for the specific use cases in vocational education and training. It can be shown that competence modelling and the presented competence model lead to an improvement of the working places, of the organizational and individual development, to an increase of the mobility worldwide as well as to a higher transparency and recognition of competences and skills. Finally leading European initiatives on competence modelling are introduced and the current standardization activities are highlighted.

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E-Learning technology standard promotion activities in Japan

Kiyoshi NAKABAYASHI

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 131-136.

Abstract （2281）

PDF （537KB）（2053）

Open technology and open standards play important roles in the progress of e-Learning. Japanese e-Learning industry, being aware of this importance, has paid a lot of attention and made various efforts to disseminate open technology and open standards in e-Learning. Among these efforts, e-Learning Consortium Japan, a group of Japanese e-Learning providers and user institutes, has implemented and operated several programs to facilitate e-Learning technology standards promotion in terms of technical resource development and engineers’ skill development. This paper describes such programs including development of software modules for SCORM implementation and SCORM engineer certification program.

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Application of ISO/IEC 19796 Standard in the Project of Teacher Education’s Innovation Platform

ZHANG Yi, SHAN Li-ming, YANG Zong-kai

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 137-145.

Abstract （2315）

Firstly, this paper introduced the project and the Reference Framework for the Description of Quality Approaches (RFDQ) which was proposed by ISO/IEC 19796 Standard. Secondly, it described the application and guidance of need analysis and framework analysis in the project. Lastly, in order to provide tuition-free normal college students and primary and secondary school teachers with excellent learning and teaching resources, it ensured innovation project′s construction quality from the standpoint of products, services and solutions.

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Comparitive research on distance education quality management systems based on ISO 9001 and ISO/IEC 19796 Standards

SU Xiao-bing, HE Bin

Journal of East China Normal University(Natural Sc 2012, 2012 (2): 146-152.

Abstract （2279）

This paper studied the relationship & difference about the ISO 9001 and ISO/IEC 19796 Standards, and compare the Reference Framework for the Description of Quality Management with Descriptive Model of Quality Approach. From the analyzation the article believes that ISO 9000 Standard pay more attention to macro-level organization and operation management, and ISO/IEC 19796 to micro-level design, development, and implement of educational products.

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Least Q-eigenvalue of a graph

HE Chang-xiang, ZHOU Min

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 1-5.

Abstract （2169）

PDF （250KB）（2457）

We showed that: If $G$ is a non-bipartite connected graph, then $q(G)\geqslant \frac{1}{n(D+1)}$, where $g(G)$ is the least $Q$-eigenvalue of $G$, and $D$ is the diameter of $G$. Some relations between the least $Q$-eigenvalue of $G$ and that of its subgraph were given.

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Toroidal embeddings of K₇

ZHAO Wen-zhou, SHI Li-hua, WU Hao, REN Han

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 6-12,40.

Abstract （2168）

PDF （2280KB）（2514）

In this paper, we showed that there are exactly $2\times5!$ embeddings of $K_7$ in the torus. All of such embeddings are triangular permitting $Gr\ddot{u}nbaum$ coloring.

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Star edge coloring of $d$-dimensional grids

DENG Kai, LIU Xin-sheng, TIAN Shuang-liang

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 13-16.

Abstract （2345）

PDF （243KB）（2592）

The star chromatic index of graph $G$ is denoted by $\chi_{s}^{\prime}(G)$. In this paper, we studied the relationship between $\chi_{s}^{\prime}(G)$, $|V(G)|=\nu$, and $|E(G)|=\varepsilon$, and proved that $\lceil\frac{8\varepsilon}{3\nu}\rceil\leqslant\chi_{s}^{\prime}(G)$ for $\Delta(G)\geqslant2$. The star chromatic index of 2-dimensional grid was obtained. We also got the attainable bounds for the star chromatic index of hypercubes and $d$-dimensional grids.

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Oscillation criteria of a class of second-order dynamic equations on time scales

YANG Jia-shan

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 17-23.

Abstract （2688）

PDF （267KB）（2234）

The oscillation for a class of second-order nonlinear variable delay dynamic equations on time scales with nonlinear neutral term was discussed. Using the time scales theory and some necessary analytic techniques, and by introducing parameter function and the generalized Riccati transformation, some sufficient
conditions for the oscillation of the equations were obtained. Some existing results in the literature are improved and extended.

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Right-passage probabilities of $\emph{\textbf{SLE}}_{\bm {\kappa}}$ and critical percolation

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 24-29.

Abstract （2834）

PDF （544KB）（2495）

This paper derived the probability formula for a chordal $SLE_{\kappa}$ trace across a given point in upper half plane $\mathbb{H}$. And on the basis of the left-passage probability, established the probability formula for a critical percolation in a closed unit circle without a given point. Finally, according to the relationship of exploration process and $SLE_{6}$, got that with the same starting and ending point, the trace of $SLE_{6}$ has the same distribution of self-avoiding walk.

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Pricing extendible option under jump-fraction process

PENG Bin, PENG Fei

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 30-40.

Abstract （2309）

PDF （238KB）（2722）

A valuation framework for extendible options is constructed when the underlying asset obeys a fractional process with jump. Under the risk neutral environment, an analytic formula for the call option with one extendible maturity is derived by solving the expected present value of cashflow and conditioning jumps for the underlying asset. Moreover, some special cases of the formula are discussed. These results are generalized to the option with$ M $extendible maturity. Its value will converge in the limit to the value of perpetual extendible option as the number of extendible maturity increases to infinite. Extrapolated technique with two
points is presented to yield a simple and efficient computation procedure to calculate the limit. Numerical results are provided to illustrate provided that our pricing expressions are easy to implement.

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Weighted finite difference methods for two-sided space-time fractional diffusion equations

MA Wei-yuan, LIU Hua

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 41-48,70.

Abstract （3495）

PDF （315KB）（3305）

A weighted finite difference scheme was proposed in order to solve initial-boundary value problems of space-time fractional diffusion equations. Their stability was analyzed by means of discrete energy method. Using mathematical induction, we proved that the scheme was convergent under the same condition. Illustrative
example was included to demonstrate the validity and applicability of the scheme.

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Two formulations and solutions of the inverse problems for Lie symmetries in dynamics of a Birkhoffian system

LONG Zi-xuan, ZHANG Yi

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 49-55.

Abstract （2168）

PDF （251KB）（2591）

First, the determining equations, the structure equations and the conserved quantities of Lie symmetries for a Birkhoffian system were given; then two formulations and solutions of the inverse problems of Lie symmetries for the system were presented. The results show that the same Birkhoffian(Birkhoff's functions) and
first integral can correspond to different Birkhoff's functions(Birkhoffian) and different Lie symmetries, and can also correspond to the same Lie symmetry and different Birkhoff's functions(Birkhoffian).

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Limit theorems in infinitesimal non-commutative probability spaces

CUI Han-zhe, XUE Yi-feng

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 56-60,96.

Abstract （2718）

PDF （322KB）（2392）

This paper proved the central limit theorems in infinitesimal non-commutative probability spaces using $R$ transform under both one-dimension and multi-dimension cases. Also Poisson limit theorem was proved using the moments-cumulants formula. Lastly, the relation between the standard semicircular elements and free poisson elements was figured out by combinatorial analysis.

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Normal criterion concerning differential polynomials and omitted functions

WANG Xue, LIU Xiao-jun, CHEN Qiao-yu

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 61-70.

Abstract （1974）

PDF （282KB）（2261）

In this paper, we proved: Let $k\geqslant 2$ be a positive integer, $\mathcal{F}$ be a family of holomorphic functions, all of whose zeros have multiplicities at least $k$, and let $h(z)$, $a_1(z)$, $a_2(z)$, $\cdots$, $a_k(z)$ are all nonequivalent to $0$ on $D$. If for any $f\in\mathcal{F}$, the following two conditions are satisfied: (a)~$f(z)=0\Rightarrow |f^{(k)}(z)+a_1(z)f^{(k-1)}(z)+\cdots+a_k(z)f(z)|<|h(z)|$; (b)~$f^{(k)}(z)+a_1(z)f^{(k-1)}(z)+\cdots+a_k(z)f(z)\neq h(z),$~ where ~$a_1(z), a_2(z),\cdots ,a_k(z)$ and $f$ have no common zeros, then $\mathcal{F}$ is normal on $D$.

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Direct sum decomposition of $\overline{\emph{\textbf{U}}}_{{\bm r},{\bm s}}\textbf{(}{\bm s}{\bm l}_{\bf 2}\textbf{)}$ about principal indecomposable modules

TONG Zhao-jia, HU Nai-hong

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 71-84,96.

Abstract （4318）

PDF （444KB）（2340）

This paper described a class of irreducible modules of the restricted two-parameter quantum group $\overline{U}_{r,s}(sl_2)$, and constructed all its principal indecomposable modules. Finally, the minimal polynomial of the action of the Casimir element on $\overline{U}_{r,s}(sl_2)$ and all the conjugate classes of the
primitive idempotents of $\overline{U}_{r,s}(sl_2)$ were obtained.

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Realization of ${\bm B}_{\bm 2}$ type finite W-algebras

ZENG Yang, SHU Bin

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 85-96.

Abstract （3141）

PDF （357KB）（2445）

In this paper we constructed an explicit set of generators for the finite W-algebras associated to all nilpotent orbits of $B_{2}$ type Lie algebras. We also computed the relations for these generators. The results give realization of $B_{2}$ type finite W-algebras.

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Research of codec and geometric correction method for true 3D volumetric display images

TIAN Feng, CAI Wen, ZHAO Fan, CHEN Ming, ZHANG Wen-jun

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 97-102.

Abstract （2444）

PDF （1076KB）（2322）

By introducing a true 3D display model, volumetric display technique based on visual voxel was explained. To solve the low-resolution problem of true 3D LED displayer, multi-machine synchronization projection method was proposed. With serial section images of true 3D display, the codec algorithm for true 3D display was studied and geometric correction model based on ray tracing method was built. The experiment proves that this method can build a practical and high-resolution true 3D displayer and can display the object exactly.

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Accurate eye location in near-infrared images based on ellipse fitting

JIN Jun-cai， TONG Wei-qing， LIANG Xiao-ni， CHEN Qiang， MEI Yue-ping， LIU Dan

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 103-110.

Abstract （2815）

PDF （3011KB）（4157）

This paper presents a novel approach to precisely locate eye position in near-infrared facial images. In this approach, we first determine the face region and initial eye position using face detection classifier based on Haar features and AdaBoost algorithm. Then we detect the eye edge in the eye region using Sobel operator, fit it into an elliptical contour. Finally, the center point of eye is located by the center of the fitted ellipse. With 120×120 normalized face images, the experiments show that the proposed approach is accurate. The average error is less than 1.5 pixels and the processing time is about 7 ms.

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Analysis of tidal characteristics of the tide gauges in the Changjiang Estuary

YANG Zheng-dong, ZHU Jian-rong, WANG Biao, LIN Tang-yu

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 111-119.

Abstract （6912）

PDF （1190KB）（5126）

Based on the measured water levels at Hengsha, Majiagang, Baozhen and Yonglongsha tide gauges in 2009, the tidal temporal and spatial variations, tidal constituents, tidal form and distortion at these gauges in the Changjiang Estuary were analyzed. There exist tidal daily inequalities that mainly occur during high tide levels, and are more significant during neap tides than spring tides in March and September while are more significant during spring tides than neap tides in June and December. The monthly maximum and minimum tidal ranges in each month at the tide gauges were given out statistically. The tidal range in the estuary varies monthly with two peaks: the maximum tidal range reaches the maximum values in March and September, and reaches the minimum values in June and December. The minimum tidal range reaches the maximum values in June and December, and reaches the minimum values in March and September. The tidal range in the South Branch reduced toward upstream due to the river discharge and friction. The tidal range at Yonglongsha tidal gauge is the largest among the 4 tidal gauges because the North Branch has small river discharge division ratio and funnel shape bathymetry. The tide is mainly composed by the 4 semi-diurnal tidal constituent (M ₂、S ₂、N ₂、K ₂), 4 diurnal tidal constituent (K ₁、O ₁、P ₁、Q ₁) and 3 shallow water tidal constituent (M ₄、MS ₄、M₆). The semi-diurnal tidal constituents M ₂ and S ₂ are the predominant ones, and the shallow water tidal constituents M ₄ and MS ₄ are apparent due to the shallow water in the estuary. The tidal form number in the South Branch is larger than 0.25, indicating where the tide is an irregular semi-diurnal tide type there, and is smaller than 0.25 in the North Branch, indicating where the tide is a regular semi-diurnal tide type. The tidal distortion coefficients in the 4 tidal gauges are all larger than 0.1, indicating that the tide at the tide gauges has significant distortion in the Changjiang Estuary, especially at Yonglongsha in the North Branch with tidal distortion coefficient 0.173.

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Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors

MA Hong-lei, ZHANG Wei-guo, HU Zhong-xing, JIA Tie-fei, DONG Chen-yin, LIU Ying

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 120-129,153.

Abstract （2452）

PDF （2400KB）（2191）

Core CX21(122°30′ E，30°00′ N) is 340 cm in length, obtained off the Yangtze Estuary, China. In this study, magnetic, geochemical and particle size analyses were conducted on sediments from the core CX21 to determine the major factors (including early diagenesis, particle size and sediment provenance) that control the down-core variations of magnetic properties. Results indicate that there are strong positive relationships between χ_ARM, χ_ARM/SIRM and χ_ARM/χ and the fractions finer than 16 μm. χ, SIRM, χ_fd and χ_fd% display relatively weak, but positive correlations with the finer fractions (2—4 μm and 4—8 μm). This suggests that particle size plays an important role in the variation of magnetic properties. Iron species analysis using the BCR method indicates that sediments below 170 cm experienced more reducing environment than that above, which is consistent with the phenomena of stronger reductive diagenesis of magnetic minerals. Ti, an element insensitive to redox conditions, reveals sediment provenance changes in the core CX21. The increase of Ti toward the surface is accompanied by an increase of concentration related magnetic parameters (χ and SIRM), suggesting that sediment source is also a main factor influencing magnetic properties. In spite of the difference in sedimentation rate and particle size composition, CX21 and the previously studied core Y7 show similar down core variations of magnetic properties, implying that magnetic properties can be used as a tool for core correlation in area off the Yangtze Estuary.

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Application of RBPs for the habitat assessment of Suzhou Creek

CAO Min, WU E-nuo, CHE Yue, CHEN Ting

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 130-137.

Abstract （4733）

PDF （1371KB）（2780）

As an important part of river health evaluations, habitat assessment has received more and more attention. Practice progresses of foreign river habitat assessment are reviewed and the basic thinking with working procedure of habitat assessment in American Rapid Bioassessment Protocols (RBPs) is introduced in this paper. Then, an empirical study has been carried out on Suzhou Creek in Shanghai. The result indicates that: Suzhou Creek has been strongly affected by human activity, and its habitat quality varies mostly between better to bad levels. Scores of the habitat quality of main streams are close to that of branches, while habitat quality of upstream areas is better than that of lower-middle reaches areas, and rural areas is better than urban areas. Result shows that Rapid Bioassessment Protocols (RBPs) has important referential value to the river habitat assessment in China.

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Discharge pattern of rural domestic sewage and the efficiency of soil infiltration in Shanghai

REN Xiang-yu, SHANG Zhao-yi, CHE Yue, YANG Kai, ZHONG Chun-jie

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 138-144.

Abstract （2639）

PDF （1722KB）（2569）

A field investigation was made in respect of the volume and quality of domestic sewage in 3 villages in Baoshan District of Shanghai, where pilot experiments of domestic sewage treating system had been performed. Meanwhile, a study on the water usage and discharge pattern in rural areas and an assessment of efficiency of soil infiltration system were made by continuous monitoring data. And an evaluation of the contribution by septic tank and treating system was also made. Finally, suggestions on the promotion and management of domestic sewage treating system in Shanghai was provided.

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Screening the ecological toxicity of sediments in black-odors rivers using Xenopus tropicalis embryos

YANG Bo, ZHU Pan, YUAN Jing, LIU Zhen, HUANG Min-sheng, SHI hua-hong

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 145-153.

Abstract （2418）

PDF （1237KB）（2362）

To assess the pollution and management effects of the black-odors rivers from Wenzhou, we screened the toxocity of aqueous sediment extracts and interstitial water of rivers using Xenopus tropicalis embryos. The surface sediment samples were collected for 5 times from September to December in 2010. The embryos were exposed to the extracting solution of the sediments (1∶4) for the first to the fourth tests and in the interstitial water for the fifth test for 48 h. Our results showed that all the embryos treated with samples from S1 died after 48 h of exposure during the 5 tests. This suggested that the sediments in S1 showed very high toxicity. Compared with the control, the body length of embryos treated with aqueous sediments extracts from Shanxia River was significantly decreased, but the body length of embryos treated with those from Jiushan River was decreased only in the third test. The percent of malformations were higher in Shanxia River than that in Jiushan River. Especially, the percent of malforation was up to 100% in S2-S4, but the highest of percent of malformations was only 70% (J2) and 40 (J1) in Jiushan River. The interstitial water of sediments in Shanxia River led to the death of all embryos. These results suggested that the toxicity of sediments in Shanxia River was generally higher than that in Jiushan River, and that the interstitial water was more toxic than aqueous sediments extracts. Our study indicates that the sediments of the black-odors rivers have adverse effects on the development of X. tropicalis embryos and show significant ecological toxicity. In addition, X. tropicalis embryos can be used for screening the hazards of sediments effectively.

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Computational and experimental identification of novel microRNAs in rats

WANG Lin, ZHANG Shuang, DONG Su-zhen

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 154-160,170.

Abstract （2077）

PDF （893KB）（2782）

The number of miRNAs in rat genome in miRBase is much less than that of mouse and human. One effective method to identify new miRNAs is to utilize the homolog- based bioinformatrical method. In this report, this method was applied to predict new miRNAs of rats. The known miRNAs sequences were downloaded from miRBase, and used as query sequences to search the rat genome at UCSC Genome Bioinformatics by BLAT analysis. New miRNAs were selected based on commonly- used miRNA standards. As a result, 45 new miRNAs were obtained. Nine of them were chosen to be validated by RT- PCR, and most of them were found expressed in brain, heart, lung, kidney, muscle, spleen, testis and liver. Based on the results, miRNA cluster analysis and miRNA gene family analysis were performed in rat genome.

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Antiproliferative and apoptotic activities of novel curcumin analogs in human liver cancer cell lines

LI Yu-bo, WEN Ying, MA Ming-liang, WU Liang-chun, WEN Ke, ZHAO Zheng

Journal of East China Normal University(Natural Sc 2012, 2012 (3): 161-170.

Abstract （2762）

PDF （2235KB）（4191）

Antiproliverative and apoptotic activities of the novel curcumin analogs (CCM series) against human liver carcinoma Bal-7402 and SMMC-7721 cells were investigated by MTT assay. The cell cycle distribution and apoptosis of SMMC-7721 cells induced by CCM-5 and CCM-14 were analyzed using flow cytometry. The expressions of caspase-3 and its activated form p17 in SMMC-7721 cells were further determined by western blot. CCM-5 and CCM-14 exhibited, in a concentration-dependent manner, the stronger antiproliferative role than those of curcumin and the other CCM compounds. Their apoptotic effects on the SMMC-7721 cells were also found to be significantly elevated as compared with the control group (P<0.01). Cell cycle distribution appeared that, as the concentrations of the compounds increased in SMMC-7721 cells, the G0/G1 phase cells decreased while the S phase and the G2/M phase cells, and the SubG1 peak increased. Furthermore, both CCM-5 and CCM-14 could activate caspase-3 expression in the SMMC-7721 cells. Collectively, our data suggest that CCM-5 and CCM-14 can restrain proliferation and promote apoptosis in SMMC-7721 cell, and the molecular mechanism underlying these actions against the cancer cells of the compounds may involve in the activation of caspase-3.

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Finite element computation and analysis on complex contact boundary

HOU Lei, LI Han-ling, LIN De-zhi, ZHANG Min, Daglish GEORGE

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 1-11,26.

Abstract （2218）

PDF （4332KB）（2464）

The safety test of transportation devices, including impact test and plastoelastic deformation, is simulated both in laboratory and by computer. Contact deformation algorithm is an international standard method to simulate the skid control on complex 3-D areas. In this paper, coupled non-Newtonian fluid equations with initial boundary value are used to solve the 3-D layer structure. A finite element method (FEM) based on the variation principle is used to solve the perturbation problem, and data mining is processed by high performance software. According to the embedding principle, a stratified element division is processed, and the complex boundary is divided into several mutual connected yet not overlapped hexahedral and square elements. After building a FEM model of both macro scale and micro scale, varying curves of parameters including energy and velocity can be obtained. On the other hand, the boundary layer theory of asymptotic perturbation method is also a way to study the complex boundary problem. The characteristic function space gained can be used both to optimize the primary function of FEM, and to establish a new asymptotic method to solve the nonlinear eigen problem. It can be used to estimate the specific parameters of materials as well. The stochastic analysis of artificial boundary conditions is then used to study the resulting data.

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Application of RBPs for the Habitat Assessment of Suzhou Creek

CAO Min, WU E-nuo, CHE Yue, CHEN Ting

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 1-8.

Abstract （106）

PDF （1978KB）（2）

As an important part of river health evaluation, habitat assessment has received more and more attention from scientists, the public, and government agencies. Practice progresses of foreign river habitat assessment are reviewed and basic thinking with working procedure of habitat assessment in American Rapid Bioassessment Protocols (RBPs) is introduced in this paper. Then, an empirical study has been carried out on Suzhou Creek in Shanghai. The result indicates that: Suzhou Creek has been strongly affected by human activity, and its habitat quality is mostly in better to bad level. Scores of habitat quality of main streams are close to scores of branches, while habitat quality of upstream areas is better than lower-middle reaches areas, and that of rural areas is better than urban areas. Result shows that Rapid Bioassessment Protocols (RBPs) has referential value to river habitat assessment in China and can be improved to a river habitat assessment method with local characteristics.

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Young type inequalities for matrices

HU Xing-kai

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 12-17.

Abstract （3274）

PDF （144KB）（4922）

First, some Young type inequalities for scalars were given. Then on the base of them, corresponding Young type inequalities for matrices were established.

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Some sharp lower bounds for spectral radius of connected graphs

GONG He-lin

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 18-26.

Abstract （2149）

PDF （201KB）（2404）

This paper studied lower bounds on the spectral radius of connected simple graphs and proved an useful inequality for the number of walks. Furthermore, some new lower bounds on the spectral radius of graphs were provided in terms of the maximum and minimum degree, the average degree, the 2-degree and the number of $k$-walks(with $k$ vertexes). By applying the properties of similar matrices and the Weyl inequalities, another lower bound was obtained by means of the number of $k$-walks. Simultaneously, all extremal graphs which achieve above bounds were also characterized.

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Numerical method for option pricing under jump-diffusion process

LI Wei, ZHOU Sheng-wu

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 27-35.

Abstract （3034）

PDF （471KB）（2532）

Numerical method for partial integro-differential equation (PIDE) resulting from option value under jump-diffusion process was studied. A non-homogeneous linear system was obtained by discretizing the spatial derivatives utilizing the fourth-order difference and extending boundary using fourth-order Lagrange interpolating polynomial. Based on $\mathrm{Pad\acute{e}}$\ approximations and partial fraction version of the matrix exponential, a high-order smoothing Crank-Nicolson scheme was constructed. Numerical calculation discussed the influence of jump intensity on vanilla option value and barrier option value, showed that the algorithm was efficient. Compared with classic Crank-Nicolson scheme, the numerical scheme avoided the spurious oscillation near the strike price and barrier value. The algorithm also can be used in the general linear boundary value problem which has non-smooth boundary.

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Harnack estimate for the Schrodinger equation under Ricci flow

WANG Jian-Hong

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 36-42.

Abstract （2330）

PDF （241KB）（2259）

This paper established the gradient estimate and Harnack inequalities of the Schrodinger equation when the metric is evolved by Ricci flow, and extended the results ofthe heat equation by C.M.Guenther

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Electrical conductivity properties of P(MMA-St)/MWNTs composites

ZHI Hui, XU Xue-cheng

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 43-49, 60.

Abstract （2299）

PDF （2515KB）（2112）

Methyl methacrylate-styrene copolymer-encapsulated multiwalled carbon nanotubes(MWNTs) composites were prepared via situ emulsion polymerization. The influence of the MWNTs content and the monomer ratio of the copolymer on the properties of composites were studied. The relationship between the structure, interaction and properties of the composites were initiated by SEM, FTIR, Raman and XPS. The results indicated that the thermal stability and electrical conductivity of the composites are enhanced with addition of MWNTs. When the content of MWNTs unchanged, the interaction between copolymers and MWNTs enhanced with increasing the content of PMMA chains segment. Copolymers are encapsulated on the surface of MWNTs evenly and the thermal stability and electrical conductivity of composites became higher.

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A general decellularization method for preparing vascular scaffolds from blood vessels of different types, diameters and wall-thicknesses

ZHANG Hong-xia, ZHAI Wan-yin, ZHANG Hong-feng

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 50-60.

Abstract （2773）

PDF （5808KB）（3885）

This study was to build a general decellularization method by combining trypsinization with repeated frozen/thawing treatment for different types of vessels including saphenous vein, carotid artery and aorta. Saphenous vein, carotid artery and aorta were decellularized by trypsinization and repeated frozen/thawing treatment. The efficiencies of cell removal and extracellular matrix (ECM) integrity were examined by Hematoxylin and eosin staining, Masson Trichrome staining and Weigert’s staining. A quantitative means based on image analysis software was used to quantify the ECM preservation. Scanning electron microscopy was used to show the extracellular matrix integrity. Histology staining and quantitative analysis demonstrated trypsinization with repeated frozen/thawing treatment decellularized the saphenous vein, carotid artery and aorta completely. The ECM structure was optimally preserved and integrity. Scanning electron microscopy examination also showed the ECM was well-preserved and the fibers were dense and orderly. The present results revealed that the trypsinization with repeated frozen/thawing method is a promising one for preparing decellularized vascular scaffolds of different types, sizes and wall-thicknesses of blood vessels.

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Quantitation and localization of allanoicase during the development of Dictysotelium discoideum

DAI Hui, HOU Lian-sheng

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 61-66.

Abstract （1814）

PDF （1709KB）（2143）

Location and expression of allanoicase were observed in the wild type KAx-3 and mutant type AK127 cells during development by immunofluorescent technique and Western blot, respectively. The results showed that abundant of allanoicase existed near the cytomembrane at the aggregation stage. At the mound stage, the fluorescence of allanoicase in the peripheral cells of mound was stronger than other place cells. When they developed into slug stage, more allanoicase existed in prestalk cells than that in prespore cells. The fluorescence of allanoicase expressed strongly at the junction of prespore area and prestalk area at the fruiting body stage,these cells would differentiate into prestalk B cells. These data indicated that there may be some relationships between the expression of allanoicase and cell-type differentiation during Dictysotelium discoideum development. The results of western blot showed that the expression of allanoicase increased gradually in the development of KAx-3 cells. The expression amount of allanoicase was maximum when the cells developed nearly 18 h. But the expression of allanoicase in AK127 cells which gene of gp150 protein was knocked out was always at a low level. It shows that the expression of allanoicase would be affected in the absence of gp150. The results indicate that the expression of allanoicase has some relationships with the developmental time of the cells, and is also associated with the expression of gp150 gene.

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Overexpression and characterization of a bacterial α-N-acetylgalactosaminidase

LIN Yi-gang, XIA Gang

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 67-74.

Abstract （2344）

PDF （1764KB）（2525）

The coding sequence of alpha-N-acetylgalactosaminidase (A4) was amplified from genomic DNA of Chryseobacterium meningosepticum and subcloned into pET24a, which was then transformed into BL21(DE3) for overexpression of His-A4. The overexpressed His-A4 enzyme was purified by using affinity chromatography and its activity was comparable to that previously reported by using a conventional method with an artificial substrate. To better measure the activity of α-N-acetylgalactosaminidase in real application, we established a novel method in which we directly used the surface antigen of red blood cell as substrate and applied ELISA to the detection of un-cleaved antigen. The activity of His-A4 was evaluated in the new ELISA method and was demonstrated to be able to decrease the blood cell surface antigen-antibody reaction in concentration- and time-dependent manner.

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Effect of forebrain NR2B overexpression on social interactions in transgenic mice

ZHANG Ning, LI Chun-xia

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 75-82.

Abstract （2083）

PDF （1797KB）（2379）

Male and female NR2B transgenic mice and their littermate controls were subjected to the social interaction test in a novel environment, sociability test and social novelty test. There was no significant difference in social interaction test in a novel environment and social novelty test among these four groups. However, compared with wild type mice, female but not male NR2B transgenic mice exhibited improvement in sociability. These results suggest that NR2B overexpression in the forebrain can improve sociability of female mice, while having no significant effect on social behaviors in male mice.

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Combined morphological and molecular analyses of higher taxa in Ostracoda

YU Na, LI Er-chao, CHEN Li-qiao

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 83-94.

Abstract （1959）

PDF （1288KB）（2129）

27 morphological characters and 18S rDNA sequences of the 9 main ostracod groups were analyzed by the maximum parsimony method to construct a consensus phylogenetic tree. The results indicate that punciidaen ostracods form a separate clade which may be placed under the subclass ‘Punciocopa’, with the same status as Podocopa and Myodocopa, but more evidence is still needed to confirm it. The classification status of halocypridian ostracods was undetermined because the topology was different on two phylogenetic trees. Among the three subclasses suggested in the study, Podocopa includes the suborders Cypridocopina, Cytherocopina, Bairdiocopina, Darwinulocopina and the family Cytherellidae; Myodocopa consists of at least two orders, Cladocopida and Myodocopida; and Punciocopa has only one family, Punciidae. This provides new evidence for solving the unstable higher classification of living ostracods.

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Contribution to the knowledge of Carabidae (Coleoptera) from Isfahan Province, Iran

Hassan GHAHARI， Memis KESDEK

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 95-101, 141.

Abstract （2143）

PDF （492KB）（2190）

Ground beetles (Coleoptera: Carabidae) are powerful predators which have efficient role in biological control of agricultural and forest pests. The fauna of these beneficial insects from Isfahan province in central Iran is studied in this paper. Totally 42 species and subspecies from seven subfamilies (Broscinae, Carabinae, Cicindelinae, Harpalinae, Lebiinae, Nebriinae, Pterostichinae) were collected and identified. Of these six species including, 〖WTBX〗Cephalota 〖WTBZ〗(〖WTBX〗Taenidia〖WTBZ〗) 〖WTBX〗circumdata cappadocica 〖WTBZ〗Franzen, 〖WTBX〗Lophyridia concolor concolor 〖WTBZ〗Dejean,〖WTBX〗 Lophyridia littoralis mandli 〖WTBZ〗Mandl, 〖WTBX〗Ophonus 〖WTBZ〗(s.str.) 〖WTBX〗cribricollis 〖WTBZ〗(Dejean),〖WTBX〗 Pachycarus 〖WTBZ〗(〖WTBX〗Paramystropterus〖WTBZ〗)〖WTBX〗 bravipennis 〖WTBZ〗Chaudoir and 〖WTBX〗Cymindis 〖WTBZ〗(s.str.) 〖WTBX〗scapularis 〖WTBZ〗Schaum are new records for Iranian fauna.

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Characteristics of the avian community in winter in Caohai of Guizhou Province, China

LUO Zu-kui, LIU Wen, LI Zhen-ji, MA Guan-wei, PAN Juan

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 102-111.

Abstract （3127）

PDF （525KB）（2410）

By the method of line transect, a bird survey was conducted in the Caohai Nature Reserve of Guizhou Province from December 2010 to January 2011. Habitats were classified into six catalogues, i.e. farmland, vegetable land, grassland, low water area, deep water area and woods. A total of 88 bird species was recorded, which belonged to 33 families and 13 orders. Among the bird species recorded, 1 species was in the GradeⅠnational key protected birds and 6 species was in the Grade Ⅱ, respectively. The overall density (D), 〖WTBX〗α 〖WTBZ〗diversity index (H′), predominant index (〖WTBX〗C〖WTBZ〗) and evenness (〖WTBX〗J〖WTBZ〗) of the avian communities were 12.14 ind·hm-2, 2.98, 0.91 and 0.67, and the species, 〖WTBX〗D〖WTBZ〗, 〖WTBX〗H′〖WTBZ〗, 〖WTBX〗C 〖WTBZ〗and 〖WTBX〗J〖WTBZ〗 were 27～35 species, 3.93～33.76 ind·hm-2, 1.61～2.78, 0.41～0.91 and 0.48～0.79, respectively. The Jaccard similarity index(〖WTBX〗Cj〖WTBZ〗) of low water area-deep water area was the highest (0.667) while that of deep water area-woods was the lowest (0.016), and the Bray-Curtis index (〖WTBX〗CN〖WTBZ〗) of woods-vegetable land was the highest (0.006 8) while that of low water area-deep water area was the lowest (0.001 4). Increment from population and urbanization development brought about the loss of avian habitats in Caohai, and disturbance from human had impacts on the avian diversity. Eco-compensation measures were recommended to practice for better management in Caohai.

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Influencing factors of water transparency in landscape water bodies of parks and public green space, Shanghai

YU Li-fan, SHI Miao-xiao, DA Liang-jun, YAN Xiao, YIN Jun-guang

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 112-119.

Abstract （2507）

PDF （1348KB）（2309）

Taking 107 landscape water bodies in 90 parks and public green space of Shanghai as study objects, the relationship between water transparency and light attenuation coefficient was quested and therefore the main influencing factors upon water transparency were studied in this paper with application of outdoor investigation and indoor experiments. The results showed that: (1) the water transparency generally stayed at a low level with mean value of (0.54±0.24) m, and more than 98.31% water bodies were below 1.0 m; (2) there was a significant negative correlation between water transparency and light attenuation coefficient, which could be shown as Kd=0.017+〖SX(〗1.12〖〗ST〖SX)〗; (3) the suspended matter was the main influencing factors of transparency in landscape water bodies of parks and public green space in Shanghai. The total phosphorus and ammonia-N in the water affected water transparency out of their nutrient control over phytoplankton. The results offer a new measurement to assess the water quality, especially the water transparency of landscape water bodies scientifically, and hence will provide a scientific basis for the improvement of water environments, the establishment of aquatic vegetation and the maintenance and management of water bodies.

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Evaluation of ecological forest ecosystem services in Zhenhai District, Ningbo

SHEN Chen-chen, YIN Jun-guang, ZHANG Jing, HUANG Yan-cheng, DA Liang-jun

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 120-130.

Abstract （2517）

PDF （1831KB）（2489）

The concentrations of microbe content, negative-ion and the temperatures, humidities, noises were monitored in 9 sample points in Zhenhai ecological forest belts, combined with the quantitive analysis of pollutants contents and dust accumulation abilities in the leaf samples. Based on these data and by applying the methods of substitution of the expenses, and shadow project, the ecological services of forest ecosystem in Zhenhai District were evaluated. The results showed that in 2008, the total value of ecological forest ecosystem services in Zhenhai District was 1.652 8×108 yuan. The sequence of the service function values was as follows: atmosphere environmental purification＞water storage＞temperature regulation＞C fixation and O2 release＞biodiversity conservation＞provision of forest products＞soil conservation soil conservation. Two factors which influence the evaluation of the ecological forest ecosystem services were proposed, including the characteristics of plant communities and the selection of assessment indexes and methods.

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Nutrient contents of dominant seagrass species and their affecting factors in Hainan Province

YU Zhi-qin, DENG Hong, WU Ke-wei， DU Jing， MA Min

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 131-141.

Abstract （2980）

PDF （730KB）（2430）

Nutrient (N, P and Fe) contents of 〖WTBX〗Enhalus acoroides, Cymodocea rotundata〖WTBZ〗 and 〖WTBX〗Thalassia hemperichi〖WTBZ〗 dominated in the seagrass beds in Hainan were studied in this paper. The results indicated that nutrient uptake by inter-tidal seagrass was influenced by both N, P in seawater and chemical characteristics of sediments (N, P, TOC and Fe). Phosphorus concentration of seagrass, which was more sensitive to water and sediment than that of nitrogen, was positively correlated with the level of P in seawater and TOC and total Fe in sediment. Enhanced nutrient level induced by human activates has exerted imbalance of N and P uptake in seagrass, with the leaf N:P of Xincungang （21.73）>Li′an （14.25）> Wenchang （9.53）≈ Tanmen （10.29）. The fact that leaf N:P had strong correlation with DTN:DIP in seawater has indicated the influence of eutrophication on the imbalance of nutrient uptake in seagrass.

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Preliminary study on dynamics of evergreen broad-leaved forest in Eastern Ningbo using 3S methods

YUAN Jing, WANG Xi-hua

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 142-148.

Abstract （2406）

PDF （691KB）（2150）

This paper classified land use and vegetation types of Ningbo with Landsat remote sensing data of 6 times (1974～2009) using 3S methods, extracted the regions of different vegetation types which turn into evergreen broad-leaved forest in each period and calculated transformation rate of every type for evergreen broad-leaved forest. Results showed that physical succession rules and economic benefits are the main causes of evergreen broad-leaved forest dynamic changes in the past 37 years. It is likely to conversed with coniferous and broad-leaved mixed forest and evergreen and deciduous broad-leaved mixed forest without considering human influence. On this basis, we measured the distance between vegetation types turned into evergreen broad-leaved forest in each period and the type remained evergreen broad-leaved forest in the same period, calculated total average value of five periods, and ordered them by vegetation types: coniferous and broad-leaved mixed forest>evergreen and deciduous broad-leaved mixed forest>bamboo>coniferous forest>tea plantations and orchards>shrub>farmland, it is found that seed spread and land use history are key factors which affected direction of degraded evergreen broad-leaved forest community’s secondary succession.

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Distribution characteristics of chlorophyll a and its relationship with phytoplankton density in Lake Dianshan

HU Xue-qin, WANG Qiang, MA Ming-rui, XU Chun-yan, YOU Wen-hui

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 149-156, 163.

Abstract （3199）

PDF （1205KB）（2210）

Ｔｈｉｓｐａｐｅｒｒｅｐｏｒｔｅｄｔｈｅｈｏｒｉｚｏｎｔａｌａｎｄｔｅｍｐｏｒａｌｄｉｓｔｒｉｂｕｔｉｏｎｐａｔｔｅｒｎｏｆｃｈｌｏｒｏｐｈｙｌｌａａｎｄｐｈｙｔｏｐｌａｎｋｔｏｎｄｅｎｓｉｔｙａｓｗｅｌｌａｓｔｈｅｉｒｒｅｌａｔｉｏｎｓｈｉｐｓ，ｗｈｉｃｈｗｅｒｅｂａｓｅｄｏｎｔｈｅｅｃｏｌｏｇｙｉｎｖｅｓｔｉｇａｔｉｏｎｃａｒｒｉｅｄｏｕｔｉｎＬａｋｅＤｉａｎｓｈａｎｆｒｏｍＯｃｔｏｂｅｒ２００９ｔｏＳｅｐｔｅｍｂｅｒ２０１０．Ｔｈｅｒｅｓｕｌｔｓｓｈｏｗｅｄｔｈａｔ：（１）Ｔｈｅｃｈｌｏｒｏｐｈｙｌｌａｃｏｎｃｅｎｔｒａｔｉｏｎｗａｓｒａｎｇｅｄｆｒｏｍ０．８７ｔｏ１３９．４３ｍｇ／ｍ３ｗｉｔｈａｍｅａｎｏｆ（２５．３５±２．７１）ｍｇ／ｍ３；（２）Ｔｈｅｐｈｙｔｏｐｌａｎｋｔｏｎｄｅｎｓｉｔｙｗａｓｒａｎｇｅｄｆｒｏｍ０．４０ｔｏ２１０．９１×１０６ｉｎｄ／Ｌｗｉｔｈａｍｅａｎｏｆ（１０．０２±２．４５）×１０６ｉｎｄ／Ｌ；（３）Ｉｎｔｈｅｔｅｍｐｏｒａｌｓｃａｌｅ，ｂｏｔｈｃｈｌｏｒｏｐｈｙｌｌａａｎｄｐｈｙｔｏｐｌａｎｋｔｏｎｄｅｎｓｉｔｙｗｅｒｅｈｉｇｈｅｒｉｎｓｐｒｉｎｇａｎｄｓｕｍｍｅｒａｎｄｌｏｗｅｒｉｎａｕｔｕｍｎａｎｄｗｉｎｔｅｒ．Ｉｎｔｈｅｈｏｒｉｚｏｎｔａｌｓｃａｌｅ, ｔｈｅｙｗｅｒｅｈｉｇｈｅｒｉｎｎｏｒｔｈｅｒｎｓｉｔｅｓｔｈａｎｉｎｓｏｕｔｈｅｒｎｓｉｔｅｓ；（４）Ｃｏｒｒｅｌａｔｉｏｎａｎａｌｙｓｉｓｓｈｏｗｅｄｔｈａｔｃｈｌｏｒｏｐｈｙｌｌａａｎｄｐｈｙｔｏｐｌａｎｋｔｏｎｄｅｎｓｉｔｙｗｅｒｅｓｉｇｎｉｆｉｃａｎｔｌｙｃｏｒｒｅｌａｔｅｄ（Ｓｉｇ．≤０．０１），ａｎｄＣｈｌｏｒｏｐｈｙｔａ，Ｃｙａｎｏｐｈｙｔａ，ＢａｃｉｌｌａｒｉｏｐｈｙｔａａｎｄＣｒｙｐｔｏｐｈｙｔａ′ｓｄｅｎｓｉｔｉｅｓ′ ｃｏｎｔｒｉｂｕｔｉｏｎｓｔｏｃｈｌｏｒｏｐｈｙｌｌａｃｏｎｃｅｎｔｒａｔｉｏｎｗｅｒｅｈｉｇｈｅｒｔｈａｎｏｔｈｅｒｃａｔｅｇｏｒｉｅｓ．Ａｎｄｔｈｅｃｏｎｔｒｉｂｕｔｉｏｎｓｖａｒｉｅｄｗｉｔｈｓｅａｓｏｎｓ.

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Research on the effects of weed nitrogen and phosphorus enrichment in natural approximating ecological agro-ditches of Dianchi Lake basin

HE Ming-zhu, XIA Ti-yuan, LI Li-chi, DA Liang-jun

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 157-163.

Abstract （2708）

PDF （711KB）（2220）

This paper quantified the weed and species removal effect of N&P respectively, and definite the yearly absorption and removal effect of N&P in farmland soil and runoff by weed in the natural approximating ecological agro-ditches in Dianchi Lake basin, to provide the evidence of water eutrophication comprehensive treatment in agro-diffused pollution by cutting N&P effectively and source control. The result proved: ① There is a great difference of N&P enrichment among different weeds, in the same or different species of different periods; ② the main phenomenon of N&P enrichment of natural approximating weed plant is N limitation (N〖DK〗∶P<14); ③ there is positive relationship between N&P nutrient absorption and the weed biomass in natural approximating ecological agro-ditch of farmland, and the whole year total amount of N&P in the basin were N (37.86±9.9) kg/hm2, P (27±1.19) kg/ha, which were much lower than the maximum of N 113.16 kg/ha, P 10.14 kg/hm2.

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Non-point source pollution management oriented urban watershed division method in tidal plains

Lv Yong-peng, YANG Kai, CHE Yue, JIN Yan, XU Qi-xin

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 164-172, 189.

Abstract （2471）

PDF （2824KB）（2625）

This paper analyzed the characteristics of urban watershed in tidal plains. Non-point source pollution management oriented urban watershed division method in tidal plain was proposed from three aspects of spatial scale, runoff mechanism and management intensity. Lingang watershed of Shanghai in China was taken as a case. The results showed that Lingang watershed can be divided into one first-class sub-watershed, 13 second-class sub-watersheds and 137 third-class sub-watersheds. The spatial distribution of the second-class sub-watersheds and function divisions are almost the same, which indicates the proposed method is operable.

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Response to the anthropogenic impact on heavy metals in the sediment core from the Swan oxbow in the middle Yangtze River

HE Rong, DENG Bing, DU Jin-zhou, WU Ying

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 173-180.

Abstract （2537）

PDF （1297KB）（2917）

The chronological dating of the sediment core from the Swan oxbow of the middle Yangtze River in April 2007 was determined by the combination of excess ²¹⁰Pb (²¹⁰Pbex) profile and the sedimentary characteristics. Environmental changes in the upper and middle reach of the Yangtze River in China in the last 50 years have been recorded by the concentration of elements (K, Ca, Na, Mg, Al, Fe, Mn, Ti, Cr, Cd, V, Zn, Pb, Cu, Ni, Co, Cs, U, Ga, Ba, Sr) in the sediment core detected by ICP-AES and ICP-MS. The results demonstrated that the regional environment is subjected to the human activities and the channel migration of the Yangtze River. During 1950s~1990s, low concentration and scale of the metal/aluminum variation suggested that the elements was mainly controlled by the weathering of river basin and the sedimentary environment. Since 1990s, substantially increasing of heavy metals suggested heavier pollutant of the river basin resulting from both increasing of industrialization and hydraulic engineering construction of the river basin. The decreasing of sediment load of the Yangtze River from hydraulic construction practices in recent years potentially diminished self-purification of river, thus negatively impact on environment of river basin.

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Effect of the deep waterway project on the salinities in the north passage of the Changjiang Estuary

FAN Zhong-ya, GE Jian-zhong, DING Ping-xing, PAN Ling-zhi

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 181-189.

Abstract （2807）

PDF （5323KB）（2482）

Unstructured-grid Finite Volume Coastal and Ocean Model (FVCOM) has been applied on the north passage, Changjiang Estuary, to study the salinity distribution and its variations under the impacts of different phases of the deep waterway project (DWP). Driven by the same forcings of freshwater discharge, tide and wind, the spring-neap-averaged and typical tidal moment’s salinity distributions under different phases of DWP are simulated and analyzed The modeling results show that the isohaline has been significantly pushed downstream after Phase I, and continued moving eastward after Phase II. At the same time, the controlling region of isohaline 1‰~5‰ has smoothly increased and the vertical mixing effects seem be weakened from the middle to eastern parts of shipping channel. Strong stratification is revealed along the deep channel. After the Phase III, the controlling region of isohaline 1‰~5‰ still increases with the upstream direction. The onshore saltwater intrusion has significantly intensified as the increased baroclinic gradient force due to deepened eastern channel.

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Upgrades of the integrated visualized storm surge forecasting system in the Changjiang Estuary

LI Cheng, GE Jian-zhong, DING Ping-xing

Journal of East China Normal University(Natural Sc 2012, 2012 (4): 190-195.

Abstract （2137）

PDF （2364KB）（2626）

This study focuses on the upgrade of an integrated storm surge forecasting system for the Changjiang Estuary with development tools such as VB.NET, Intel Fortran, etc. The forecasting efficiency with wave consideration has significantly improved by the implementation of SWAN parallel computation. Hydrodynamic model could provide much faster forecasting with the optimization and modularization of the source code. New software interface was designed to improve the compatibility and stability. The comparison between the original and upgraded version is given with 5 storm surge simulation, with an aim to show the system improvement on forecasting efficiency and precision. It shows the model precision of upgraded version is guaranteed. The efficiency is quantitatively increased by 68% and 60% with consideration and neglecting of wave effect, respectively.

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Three-dimensional nickel-coated silicon microchannel plates for supercapacitors

LIU Tao, WANG Fei, XU Shao-hui, WANG Lian-wei

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 1-9.

Abstract （2634）

PDF （3558KB）（2511）

A unique three-dimensional Si-MCP/Ni/Ni(OH)2 structure for supercapacitor was produced. Chemical liquid deposition was carried out to grow nano-sized Ni(OH)2. The as-prepared Ni(OH)2 film consists of many intertwined nano-flakes with both the α- and β-Ni(OH)2 phases. The formation mechanism of Ni(OH)2 was introduced. The as-prepared and annealed materials were evaluated electrochemically by cyclic voltammetry and chronopotentiometry. The cyclic voltammetry results reveals a typical redox characteristic of the sample. A specific capacitance of 2 150 F/g was observed at a discharge current of 10 mA, and the structure has high stability in prolonged charging and discharging experiments. The capacitance of the annealed sample decreases as the annealing temperature increases. Surface morphology of the samples after 2 000 cycles and annealed samples were observed. Decrease of the surface area of Ni(OH)2 is consi-dered as the main reason of the capacitive loss. Owing to the large specific capacitance and good stability, the unique structure is suitable for electrochemical super-capacitors used in secondary power sources and devices.

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Micopolarization elements on p-aminoazobenzene film induced by femtosecond laser pulses

PENG Xue-ying, JIA Tian-qing, SUN Zhen-rong

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 10-15.

Abstract （1994）

PDF （1860KB）（2651）

Fabrication of nanostructures on a surface of p-aminoazobenzene polymer film illuminated by 400 nm and 800 nm femtosecond laser was studied. Ripples with periods of 210 nm and 500 nm were produced by linearly polarized 400 nm and 800 nm femtosecond laser pulses, respectively. The periods of the ripples increase with increasing the intensity of incident laser pulses. The interference of this diffracted optical wave with the incident beam gives rise to optical interference ripples. Gradient of surface tension is induced by the surface temperature gradient caused by the interfered light. The gradient of surface tension gives rise to the periodical ripple structures. Thick polymer film was made and illuminated by 400 nm femtosecond laser，and periodic nanostructures were also been observed.

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Characterization of a humidity sensor fabricated with SnO₂ nano-spheres via dielectrophoresis

CAO Chun-yue

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 16-23,36.

Abstract （1881）

PDF （2541KB）（2440）

A relative humidity sensor was fabricated by dielectrophoresis (DEP) to connect with the sphere-shaped SnO₂ nano-particles as sensing elements based on the Au micro-electrodes with the gap of 20 μm. the I-V curve obtained verified good electric conductivity of the Au/SnO₂/SnO₂/Au structure fabricated. The sensing properties were tested in a self-designed relative humidity measuring system. The high sensitivity and good repeatability were obtained. It was proved the sensing structure fabricated in the solution using DEP has good stability under varied humidity levels, even under a high humidity level. The proposed methodology can be easily applied to other nano-spheres and construction of other devices.

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Electrical conductivity properties of modified polyacrylonitrile/MWNTs composites

ZHANG Jian, XU Xue-cheng

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 24-30.

Abstract （2345）

PDF （1824KB）（3029）

The PAN was synthesised by solution polymerization, modified by heat-treatment and then blended with carbon nanotube to obtain the composites. The electrical conductivity of the composites increased by two orders of magnitude more than that unmodified. Fourier transform infrared spectroscopy (FTIR), Raman spectra and X-ray spectroscopy (XPS) were used to characterize the composites. The results showed that some nitrile were changed into imino, and the chain-like structure also transformed to the cyclic structure after heat-treatment. The strong π-π system was formed between π-electrons of MWNTs and the modified PAN. The interaction between the modified polyacrylonitrile and carbon nanotubes was greatly enhanced. The electrical conductivity was highly improved.

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Spin interactions in direct-gap semiconductors

SUN Fang, TANG Zheng

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 31-36.

Abstract （2410）

PDF （1185KB）（2574）

This paper studied spin interactions in a direct-gap system with the two-impurity Haldane-Anderson model, by using exact quantum Monte Carlo method. Exact numerical results revealed two types of magnetic correlation functions, and none of them showed clearly RKKY-type oscillatory behavior. Besides, it was observed that magnetic correlation in the system was complicated and multifactor controlled. The complex magnetic behaviors observed in this study would be helpful for understanding the magnetic properties of a gaped system, snch as the dilute magnetic semiconductors.

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Synthesis and electrochemical characterization of 3D VO₂(B) nanostructures

ZENG Min, SONG Chang-qing, JIANG Wen-tao, YIN Hai-hong, YU Ke

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 37-44.

Abstract （2196）

PDF （3889KB）（2200）

We successfully fabricated VO₂(B) nanostructures through a hydrothermal process. The microstructures and the corresponding electrochemical properties of as-synthesized materials were evaluated. Experimental results indicated that the morphology of the products can be changed by modifying concentrations of the reducing agent, and the nanoflowers composed of nanobelts perform better specific capacity and cycling properties than those composed of nanoflakes. Our results show that the VO₂(B) nanostructures may have potential use in the anode material of Li-ion batteries.

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Development of a luciferase-based method for rapid cell viability detection

ZHU Jing-jing, BAO Qiu-ying, WANG Yu-meng, XIA Gang

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 45-53,84.

Abstract （2149）

PDF （906KB）（2047）

The firefly luciferase gene was PCR-amplified from plasmid pGL4.26 and subcloned into a bacterial overexpression vector pET24a. Expressed luciferase fusion protein was purified using Ni-NTA affinity chromatograph and its activity was confirmed using Bright-GloTM kit. Based on the ATP-dependency of luciferase reaction, we developed a cell viability assay, which is faster, more convenient, and more sensitive in detect cell viability than generally used MTT, CCK-8 and Alamar Blue methods.

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Study on carbamate pesticides by capillary electrophoresis with laser-induced fluorescence detection

YANG Yu-lin, ZHAO Xiao-yin, ZHAO Wen-jie, ZHOU Tian-shu

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 54-61.

Abstract （2803）

PDF （608KB）（1698）

A sensitive and rapid capillary electrophoresis method with laser-induced fluorescence detection (CE-LIF) was developed for the determination of carbamate pesticides (including (3,5-dimethylphenyl) N-methylcarbamate (XMC), and mercaptodimethur). In alkaline solution, carbamate was hydrolyzed to methylamine, which can be derivatized by 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) and detected by CE-LIF. Several parameters which influence the hydrolysis, derivatization and electrophoresis separation, such as pH, concentration of buffer solution and concentration of NBD-Cl, were investigated. The detection limits of the three carbamates were 3.0×10^-9、1.0×10^-9 and 3.0×10^-9 mol/L, respectively. The proposed method was successfully employed to determine the rate constants and activation energies for carbamates hydrolysis.

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Energy decay estimation for the nonlinear viscoelastic equation with nonlinear second-order boundary damping

LU Jun, ZHANG Hong-wei

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 63-68.

Abstract （2524）

PDF （249KB）（2267）

The exponential decay estimation of the energy for the nonlinear viscoelastic equation with general damped term was obtained by using Nakao's inequality, and the algebra decay estimation of the energy for the equation with polynomial damped term was given by the same inequality.

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Transient influence on the electromagnetic launch rail under a cosine function of the magnetic pressure

LIU Feng, LIU Wen

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 69-75,92.

Abstract （2255）

PDF （498KB）（2350）

This paper studied the friction damping factors that influence electromagnetic rail launching. An electrical magnetric launcher orbit was simulated into an elastic foundation beam under a movement loading, a mathematical model of beam was established by using Euler beam theory, and the analytic solution of the flexural deflections of an orbit involving exponential functions of the dynamics problem under a simple harmonic pressure was derived with the help of the integral transformation, the inverse transformation and so on. The results of the numerical examples with MATLAB
software showed that the elasticity coefficient, the viscous external damping coefficient and the coulomb damping coefficient have different influences on the transient dynamic response. So it provides sufficient theory evidence about the initial value problem of solving a higher order partial differential equation and improving the performance of an electromagnetic emission device.

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Wavelet estimation for locally self-similar processes

LU Zhi-ping, TAO Qin-ying

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 76-84.

Abstract （1904）

PDF （284KB）（2156）

A new estimation method was proposed based on the maximal overlap discrete wavelet transform, which provided a good alternative for the estimation of the time-varying self-similarity parameters. It also included a simulation-based study using Monte Carlo method, which increases the accuracy of the estimation. Finally, an application was made on the vertical ocean shear measurements.

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Pricing option with transaction costs under the subdiffusive Black-Scholes model

GU Hui, ZHANG Yun-xiu

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 85-92.

Abstract （2355）

PDF （289KB）（2306）

This paper dealt with the problem of discrete time option pricing by the subdiffusive Black-Scholes model with transaction costs. A subdiffusive geometric Brownian motion was introduced as the model of underlying asset prices exhibiting subdiffusive dynamics. In the presence of transaction costs, by a mean self-financing delta-hedging argument in a discrete time setting, a pricing formula for the European call option in discrete time
setting was obtained.

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Networked fault tolerant control of the uncertain singularly perturbed system with packet dropout

WANG Yan-yan, LIU Wei, KONG Ling-zhi

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 93-100.

Abstract （2075）

PDF （336KB）（2575）

Considering the networked packet dropout of a singularly perturbed system under actuator failure, the original system was transformed to a singularly perturbed uncertain switched system. Then, the difficulty arising in the boundary dynamic behavior caused by a small parameter was overcome by using the matrix inequality technique. Meanwhile, the feedback stabilization of the singularly perturbed uncertain switched system was studied under some certain data dropout rate. Further, the design method of a controller and the sufficient condition of stabilization of the system were presented. Finally, a numerical example was given to illustrate the effectiveness of the proposed method.

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Positive solutions of the semipositone three-point boundary value problem on time scales

WANG Ying

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 101-108.

Abstract （2082）

PDF （174KB）（2194）

The existence of positive solutions for semipositone three-point boundary value problem on time scales was discussed, by using the Leggett-Williams fixed point theorem; the existence of at least two positive solutions was obtained. The results extend and improve some known results. As an application, an example was given to demonstrate the main result.

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Multiple solutions for ${\bm p}({\bm x})$-Laplacian problems in ${\bf R}^{\bm N}$

CHEN Zi-gao

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 109-119.

Abstract （3375）

PDF （221KB）（2665）

By using the fountain theorem and the dual fountain theorem, respectively, the existence and multiplicity of solutions for $p(x$)-Laplacian equations in $\mathbf{R}^{N}$ were studied, assumed that one of the perturbation terms $f_1(x,u),\, f_2(x,u)$ is superlinear and satisfies the Ambrosetti-Rabinowitz type condition and the other one is sublinear. The discussion was based on variable exponent Lebesgue and Sobolev spaces.

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An upper bound for the vertex-distinguishing star edge chromatic number of graphs

LIU Xin-sheng, LU Wei-hua

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 120-126.

Abstract （2200）

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The vertex-distinguishing star edge chromatic number of $G$, denoted by $\chi'_{\rm vds}{(G)}$, is the minimum number of colors in a vertex-distinguishing star edge coloring of $G$. The vertex-distinguishing star edge colorings of some particular graphs were obtained. Furthermore, if $G(V,E)$ is a graph with $\delta\geqslant 5$, and $n\leqslant \Delta^7$, then $\chi'_{\rm vds}{(G)}\leqslant 14\Delta^2$, where $n$ is the order of $G$,
$\delta(G)$ is the minimum degree of $G$, and $\Delta(G)$ is the maximum\linebreak degree of $G$.

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Space theory on graphs: The linearly independence methods in graph theory (I)

REN Han WU Hao

Journal of East China Normal University(Natural Sc 2012, 2012 (5): 127-144.

Abstract （2342）

PDF （459KB）（2342）

In this paper we survey some important results and methods applied in graph theory and related topics. Different from the classical combinatorial matrix methods used in the fields such as the spectral theory of graphs, we concentrate on the finite linearly spaces over various kinds of number fields and their actions and influnces on the structural graph theory.

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