Journal of East China Normal University(Natural Science)

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Review and perspective: Function of intestinal microbiota in aquatic animals

ZHANG Mei-Ling, DU Zhen-Yu

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 1-8. DOI: 10.3969/j.issn.10005641.2016.01.001

Abstract （1604）

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The digestive tracts of vertebrates harbors complex assemblages of bacterial community, which play important roles in nutrient absorption, immune regulation and epithelial development in the host. Although aquatic animals represent the biggest taxonomic and ecological diversity, our knowledge about their intestinal bacteria composition and function is limited. This paper summarizes the recent progress in the research of intestinal bacteria, including the factors influencing the intestinal microbiota assemble, features of the intestinal microbiota in aquaculture and the relationship between the host and the intestinal bacteria，and suggestes the significance and perspective of microbial ecology in aquaculture in future.

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the q-commutators of braided groups

HU Hong-Mei

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 9-18. DOI: 10.3969/j.issn.1000-5641.2016.01.002

Abstract （1071）

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With the standard R-matrices and suitably chosen a pair of dual braided groups, the authors gave the rank-inductive constructions of U_q}(\mathfrakg}}) for the ABCD series via the double-bosonization theory in [1]. This paper described explicitly the expressions for the generators of braided groups in the new higher rank-one quantum groups in these constructions, which are the q-commutators with the simple root vectors. These q-commutators are very important to the structure of new quantum groups.

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Contrast structure of higher dimensional singularly perturbed optimal control problem

WU Li-Meng, NI Ming-Kang, LU Hai-Bo, ZHANG Juan

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 19-26. DOI: 10.3969/j.issn.1000-5641.2016.01.003

Abstract （858）

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In this paper, a class of linear high-dimensional singularly perturbed optimal control problem is discussed. By means of k+\sigma exchange lemma, we prove the existence\linebreak of contrast structure solution for the singularly perturbed optimal control problem. Meanwhile, by virtue of the direct scheme method which is based on boundary function method, we construct the uniformly valid formal asymptotic solution. Finally, an example is presented to illustrate the main results.

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Cells of the weighted Coxeter group (C3,l6)

YUE Ming-Shi

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 27-38. DOI: 10.3969/j.issn.1000-5641.2016.01.004

Abstract （754）

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Let \alpha be a group automorphism of the affine Weyl group (\widetilde{A}_{2n},\widetilde{S}) with \alpha(\widetilde{S})=\widetilde{S}. Affine Weyl group(\widetilde{C}_n,S) can be seen as the fixed point set of the affine Weyl group (\widetilde{A}_{2n},\widetilde{S}) under its group automorphism \alpha. The restriction to \widetilde{C}_n of the length function \widetilde{l}_{2n} on \widetilde{A}_{2n} can be seen as a weight function on \widetilde{C}_n. In this paper, we
give the description for all the left and two-sided cells of the specific weighted Coxeter group (\widetilde{C}_3,\widetilde{l}_6) and prove that each left cell in (\widetilde{C}_3,\widetilde{l}_6) is left-connected.

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Jordan all-derivable points in upper triangular matrix algebras

SUN Ai-Hui

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 39-42. DOI: 10.3969/j.issn.1000-5641.2016.01.005

Abstract （828）

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Zhao and Zhu proved the following result: Every matrix in upper triangular matrix algebras over the complex number field is a Jordan all-derivable point. The aim of this paper is to show that every matrix in upper triangular matrix algebras over an infinite field of characteristic not 2 is a Jordan all-derivable point.

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Optimality conditions and duality for a class of non-smooth fractional optimization problems

WANG Guo-Dong, CHEN Lin

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 43-50. DOI: 10.3969/j.issn.1000-5641.2016.01.006

Abstract （804）

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This paper studies a class of non-smooth multi-objective fractional optimization problems, using the tools in variational analysis and the generalized differential, and establishes necessary conditions and sufficient conditions under some new convexity. These results, which are relatively new in the study of non-smooth multi-objective fractional optimization problems, are characterized by limiting subdifferential. And the study of limiting subdifferential is a pretty hot subject in recent years. In addition, the weak duality and the strong duality results have been obtained in Mond-Weir type duality.

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A Hilbert-type integral inequality with multi-parameters and composite kernel

LIU Qiong, HUANG Lin

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 51-57. DOI: 10.3969/j.issn.1000-5641.2016.01.007

Abstract （703）

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By introducing some special functions to characterize the constant factor, a Hardy-Hilbert type integral inequality with the kernel $\ln(1+\mathrm{e}^{-\alpha x^{\lambda_1}y^{\lambda_2}})$ is obtained, and its equivalent form is considered. The constant factors of the equivalent inequalities are proved being the best possible.

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Research on the economic rationality of Hengsha new terminal

ZHOU Yu, ZHU Jian-Hua, CHEN Jing-Chao

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 58-68. DOI: 10.3969/j.issn.1000-5641.2016.01.008

Abstract （854）

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Based on current situation of Shanghai Port, this paper focuses on the relationship between port and the development of city. First, data of port and GDP of city are analyzed making use of the linear regression model. Furthermore, the influence on economy in Shanghai after Hengsha new terminal is predicted.Considering the possible deviation in the linear model, however, a neural network model is established to forecast corresponding results. By the above quantitative analysis methods, Hengsha new terminal is expected to drive the development of related industries, bring economic benefits to some extent. In other words, Hengsha new terminal has positive and significant influence on development and construction of Shanghai.

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Reliability analysis of Birolini's duplex system sustained by a non-priority unit in cold standby

HUANG Kai, WU Qing-Tai

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 69-80. DOI: 10.3969/j.issn.1000-5641.2016.01.009

Abstract （839）

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This paper deals with Birolini's duplex system sustained by a non-priority unit in cold standby. It is assumed that the life of the unit is exponential distribution, and the repair time of the unit is general continuous distribution. Then by using supplementary variables approach and generalized Markov process method, the Laplace transform of the reliability and the mean time to first failure are attained. Meanwhile, the availability and the failure frequency of the system are obtained.

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The multiple Markov chains in random environments

FEI Shi-Long

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 81-90. DOI: 10.3969/j.issn.1000-5641.2016.01.010

Abstract （846）

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The multiple Markov chains in random environments were introduced and several properties and application backgrounds of the multiple Markov chains in random environments were given. An existence theorem on the multiple Markov chains in random environments was proved and several equivalent conditions of the multiple Markov chains in random environments were presented

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Bi-super-connected digraphs

LI Jing-Jing, LIU Juan

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 91-95. DOI: 10.3969/j.issn.1000-5641.2016.01.011

Abstract （999）

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A simple digraph D (without loops and multiple arcs) is said to be super-connected if every minimum vertex-cut is the out-neighbor set or in-neighbor set of a vertex. A super-connected digraph D is said to be bi-super-connected if there exists a minimum vertex-cut is both the out-neighbor set of a vertex and the in-neighbor set of a vertex. In this paper, we will give the necessary and sufficient conditions of line digraph is bi-super-connected, furthermore, we study the big super-connectivity of Cartesian product and lexicographic product of two digraphs.

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Characterization of bipartite graph with maximum spectral radius

NIU Ai-Hong, WANG Guo-Ping, QIN Zheng-Xin, MOU Shan-Zhi

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 96-101. DOI: 10.3969/j.issn.1000-5641.2016.01.012

Abstract （850）

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The adjacency matrix A(G) of a graph G is the n\times
n matrix with its (i,j)-entry equal to 1 if v_i and v_j are
adjacent, and 0 otherwise. The spectral radius of G is the
largest eigenvalue of A(G). In this paper we determine the graphs
with maximum spectral radius among all trees, and all bipartite
unicyclic, bicyclic, tricyclic, tetracyclic, pentacyclic and
quasi-tree graphs, respectively.

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The chromatic number for fork-free graphs

WANG Xiao

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 102-106. DOI: 10.3969/j.issn.1000-5641.2016.01.005

Abstract （735）

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Randerath once conjectured that every triangle-free and fork-free graph is 3-colourable. By a lemma, the conjecture for C_4-free graphs was proved.Moreover, the result that every triangle-free, C_4-free and C_{2,2,1,n}-free graph is (n+2)-colourable was proved as well, where C_{2,2,1,n} is the long handled fork with order (n+6) obtained from E-graph and P_n by joining the center vertex of E and one endvertex of P_n.

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Terahertz extraordinary transmission from flexible C-shape split-ring resonators

LUO Cong-Wen, ZHAO Zhen-Yu, SONG Zhi-Qiang, ZHAO Hong-Wei, HE Xiao-Yong, SHI Wang-Zhou, CHEN Zhi-Zhan

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 103-106. DOI: 10.3969/j.issn.1000-5641.2016.01.014

Abstract （869）

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Polarization dependence of terahertz (THz) extraordinary transmission from a flexible C-shape split-ring resonance (C-shape SRR) is investigated. When the THz polarization is perpendicular to the gap of C-shape SRR, a single-peak resonance is observed owing to the inductive-capacitive (LC) resonance. When the THz polarization is parallel to the gap of C-shape SRR, a periodic multiple resonances phenomenon is observed. The simulation of the electric density distribution and surface current indicate that the asymmetric Fabry-P\'{e}rot effect of the C-shape SRR attributes to the periodic resonances.

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Expression analysis of Brassica napus L. droughtrelated genes under drought stress

HE Qiao-Li, ZHANG Zhe, RAN Chun-Yan, XIE Xiao-Yu

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 113-122. DOI: 10.3969/j.issn.10005641.2016.01.015

Abstract （977）

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The high droughttolerant variety Holiday was treated as the experimental material under drought stress in the early flower stage. The expression level of 6 droughtrelated genes (ABA2、BnSOS2、BnCS、 CAM、CBF4、PIP1) which were selected from different organs (root, stem, leaf, flower and green pod) at different stress times (1,3,5,7 days) were analyzed by qRT PCR technology. The result showed that the expression of six droughtresistant genes in different organs all increased under drought stress, and they presented different trends respectively under different drought stress. In the same organs, the expression of the six droughtresistant genes had obvious different. In root, the maximum cumulative expression value gene was ABA2, and the minimum cumulative expression value gene was CBF4; in stem, the maximum was CAM, the minimum was CBF4; in leaf, the maximum was PIP1, the minimum was ABA2; in flower, the maximum was CBF4, the minimum was BnSOS2; in green pod, the maximum was BnCS, the minimum was CBF4. It suggested that different drought resistance pathway played〖JP2〗 different role under drought stress. The correlation analysis between expression values of droughtrelated genes and stress time showed that the expression quantity of CAM gene in the stem volume, CBF4 gene in the flowers was significantly positively related to the stress time.

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Online sample focusing technique in capillary electrophoresisamperometric detection for biogenic amines

WANG Guan, TANG Wan-Rong, GE Shu-Li, HAN Ruo-Bing, WANG Qing-Jiang, HE Pin-Gang, FANG Yu-Zhi

Journal of East China Normal University(Natural Sc 2016, 2016 (1): 123-133. DOI: 10.3969/j.issn.1000-5641.2016.01.016

Abstract （700）

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An online focusing method, based on fieldenhanced sample injection coupled with transient moving substitution boundary, was developed for the separation and capillary electrophoresis(CE)amperometric detection (AD) of biogenic amines under acidic conditions for the first time. The proposed method was based on the substitution reaction between 18crown6bonded biogenic amine complexes and Na+ cations at the substitution boundary. By using this method, electrode fouling was prevented in electrochemical detection. The factors affecting extraction efficiency, separation, and detection were investigated. Under the optimum conditions, the limits of detection of five analytes in a sample, which was prepared in a lowconductivity matrix, ranging from 2.2 to 9.8 nmol/L (signaltonoise ratio, S/N＝3), and about 160 to 300fold enhancement in concentration was achieved compared to the conventional CEAD method. This method has great potential for the detection of biogenic amines.

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A review of the studies on melanin synthesis and whitening products

YE Xi-Yun, ZHU Ping-Ya

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 1-8. DOI: 10.3969/j.issn.1000-5641.2016.02.001

Abstract （1010）

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Due to environmental pollution and the increasing size of the ozone hole, more UV rays penetrate the atmosphere and reach the ground, which leads to skin pigmentation abnormalities. In this article, we reviewed the latest studies on melanin synthesis, mainly focusing on the regulation and related signal pathways with regard to tyrosinase, a vital rate-limiting enzyme involved in this process. Several critical factors affecting melanin synthesis were also presented, providing theoretical basis for screening melanin inhibitors. In addition, several new popular commercial whitening products and their property were discussed. All these information is benificial to draw the public’s attention to skin pigmentation disorder as well as proper care.

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Effcient characterization for M{2,3},M{2,4} and M{2,3,4}and Mf2;3;4g

ZHENG Dao-Sheng

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 9-19. DOI: 2016.02.002

Abstract （601）

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In this paper, by {\it selecting inverse image index method}, an efficient characterization formula from set ${\mathbb{A}}_{1}=\{\alpha:\alpha=(I_s,\eta^{\rm T})^{\rm T}\in \Bbb C^{n\times s}_s\}$ onto set ${\mathbb{B}}_1=\{\beta:\beta=\alpha(\alpha^*\alpha)^{-1}\alpha^*, \alpha\in{\mathbb{A}}_1\}$ is given. Besides, it is shown that each element of $I\{2,3\}_s$ is permutation similar to an element of ${\mathbb{B}}_1$. Then efficient characterization formulas for $I\{2,3\}$ and $M\{2,3\}$ are obtained respectively. An interesting thing is ${\mathbb{B}}_1$ is a dense subset of $I\{2,3\}_s$. The fact that $I\{2,3\}_s=I\{2,4\}_s=I\{2,3,4\}_s$ enables us to obtain the efficient characterization formulas for $M\{2,4\}$ and $M\{2,3,4\}$ fluently. Algorithm 3.1 may be used to compute elements of $I\{2,3\}_s$ and to avoid the repeated computation work.

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Support vector machine in the primal space based on\\ the ramp loss function\\[6mm

YUAN Yu-Ping, AN Zeng-Long

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 20-29. DOI: 2016.02.003

Abstract （623）

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Aiming at the problem of standard support vector machine being sensitive to the noise, a new method of support vector regression (SVR) machine based on dissymmetry quadratic and controlled-insensitive loss function is proposed. Using the concave and convex process optimization and the smooth technology algorithm, the problem of non-convex optimization is transformed into the problem of the continuous and twice differentiable convex optimization. Using the Amijo-Newton optimized algorithm of finite iteration termination, the established optimization model is solved, and the convergence of the algorithm is analyzed. The algorithm can not only keep the sparse nature of support vector, but also control the abnormal values of the training sample. The results of theexperiment showed that the support vector regression machine model proposed kept good generalization ability, and the model could fit better both the simulated data and the standard data. Compared with the standard support vector machine (SVM) model, the proposed model not only can reduce the effects of noise and outliers, but also has stronger robustness.

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A note on the commutativity of {C}^*-algebras

JIANG Run-Liang

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 30-34. DOI: 2016.02.004

Abstract （639）

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There are many characterizations for commutative C^*-algebras. In this note, we prove that a C^*-algebra $\mathcal{A} is not commutative if and only if there is a C^*-subalgebra \mathcal{B} in \mathcal{A}'' (the enveloping Von Neumann algebra of mathcal{A}) such that mathcal{B} is-isomorphic to mathrm M_2(\mathcal{\textbf{C}}). In terms of this result, we can recover some characterizations for the commutativity of C^-algebras appeared before.

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Existence of time-dependent global attractors for plate equations

LIU Ting-Ting, MA Qiao-Zhen

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 35-44. DOI: 2016.02.005

Abstract （547）

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The concept of time-dependent global attractors was recently presented by Di Plinio, Temam et al.~By using the skill of the operator decomposition, the asymptotic compactness of a family process \{U(t,\tau)\} corresponding to the plate equations with the coefficient dependent on time was proved,~and then the existence of time-dependent global attractors as well as the regularity were obtained under the condition that f satisfies the critical exponent growth

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Reliability coefficient of star complex system

ZHANG Qi-Bin, SHA Xiao-Cong, WANG Na, XU Hui-Ping, MA Ji

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 45-50. DOI: 2016.02.006

Abstract （439）

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The reliability coefficients play an important role in the reduction of complex systems to a linear combination of parallel subsystems. This paper defines a new complex system, namely, star-k-out-of-n:F system, and calculates the reliability coefficients of this system

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List improper coloring of graphs of nonnegative characteristic

XU Yang

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 51-55. DOI: 2016.02.007

Abstract （437）

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A graph G is called (k,d)^*-choosable if, for every list assignment L with |L(v)|=k for all v\in V(G), there is anL$-coloring of G such that every vertex has at most d neighbors receiving the same color as itself. Let G be a graph embedded in a surface of nonnegative characteristic. In this paper, we prove that if G is a 2-connected graph, which contains no 5-cycles, adjacent 3-faces and adjacent 4-faces, then G is (3,1)^*-choosable

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Minimum fundamental cycle basis of (n-2)-regular bipartite graphs with order 2n

HE Chang-Xiang, LIU Wei-Long

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 56-61. DOI: 2016.02.008

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Let G be an (n-2)- regular bipartite graph with order 2n. In this paper, we constructed a fundamental cycle basis of G and proved this basis is a minimum fundamental cycle basis. For any minimum fundamental cycle basis, we also determined the structure of the spanning tree corresponding to it.

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An effective localization attack in locationbased social network

WANG Rong-Rong, XUE Min-Hui, LI Xiang-Xue, QIAN Hai-Feng

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 62-72. DOI: 10.3969/j.issn.1000-5641.2016.02.009

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Locationbased social network (LBSN) services enable users to discover nearby people. Original LBSN services provide the exact distances for nearby users. Existing studies have shown that it is easy to localize target users by using trilateration methodology. To defend against the trilateration attack, current LBSN services adopt the concentric bandbased approach when reporting distances. In this paper, by using number theory, we analytically show that by strategically placing multiple virtual probes as fake GPS, one can accurately pinpoint user locations with either accurate or coarse bandbased distances. As a proof of this concept, WeChat is examplified to validate that our attack methodology is effective in a realworld deployment. Our study is expected to draw more public attention to this serious privacy issue and hopefully motivate better privacypreserving LBSN designs.

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A novel orientation sensing method based on\\RFID technology

GUO Feng-Ming, LI Bing, HE Yi-Gang,

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 73-80. DOI: 2016.02.010

Abstract （525）

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It is critical to sense orientation of target objects for radio frequency identification (RFID) applications, such as supply chain, equipment management, and so on. Based on the principles of ultra high frequency radio frequency identification (UHF RFID) and the theory of antenna scattering, a link budgets model of RFID is provided. Utilizing the technology of RFID and polarization diversity, a novel method for sensing the orientation is presented. The method requires standard RFID equipment and assumes that each object is attached by two RFID tags. Based on the received signal strength of the tag reply, orientation of the target object is obtained by using of a simple statistical estimator. The performance of the method proposed is evaluated via experimental measurements, and the results show that the mean estimated error of orientation sensing is 10.1^{\circ}

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Climate change and droughtflood disasters responses in South China

WANG Wen-Jing, YAN Jun-Ping, LIU Yong-Lin, CAO Yong-Wang

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 81-89. DOI: 10.3969/j.issn.1000-5641.2016.02.011

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According to the meteorological data of 80 stations in South China, influences of different disaster inducing factors on climate change were analyzed, using MannKendall test method, standardized precipitation index, the wavelet analysis, to explore the trend of drought and flood under global warming background. The results showed that: (1) In the last 54 years, the annual average temperature was 19.95 °C in South China, with a linear tendency being 0.17 °C/10a. The abrupt change of average annual temperature occurred in 1993. (2) The precipitation in South China was increasing with the speed of 8.775 mm/10a. After the abrupt change of temperature，the temperature increased fast, while the precipitation decreased rapidly. The colding and wetting in spring changed to warming and wetting; the warming and drying in autumn changed to warming and wetting; the warming and wetting in winter changed to warming and drying.(3) According to the amount of annual precipitation, South China area was divided into two regions: the average annual precipitation in Yunnan province was increasing along the latitude direction from north to south; the average annual precipitation in the other provinces were increasing along the longitude direction from east to west. (4) The flood increased and drought reduced after the abrupt change of temperature. The frequency of flood increased in some areas, while the frequency of drought reduced in space. Therefore, the overall climate change presented a warming and wetting trend.

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Responses of runoffsediment flux and bedform in the Middle Yangtze River to the completion of the Three Gorges Dam

YUAN Wen-Hao, LI Mao-Tian, CHEN Zhong-Yuan, YIN Dao-Wei, WEI Tao-Yuan

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 90-100. DOI: 10.3969/j.issn.1000-5641.2016.02.012

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Comparation methods are used to examine the responses of hydrosediment and river bedform after the completion of the Three Gorges Dam. Data are based on the historical data of runoff and sediment discharge (1950—2013) and insite measured data of depth and bedload (2003, 2011). The results demonstrate that the average annual discharge at Yichang and Hankou stations has decreased 10.1% and 7.2% after the Three Gorges Dam completion. The average annual sediment flux of the Yichang and Hankou stations decreased from 556 and 402 Mt/a to 60 and 150 Mt/a, accounted for 89.5% and 62.2% of that have been trapped by the Three Gorges Dam. In addition, the average annual medium diameter of suspended sediment at Yichang and Hankou stations has decreased from 35 \mm and 25 \mm to 4 \mm and 15 \mm, but the bed load has become coarser and coarser. The depth at the thalweg has also increased to 0.4～3.7 m due to the bed erosion after the Three Gorges Dam impoundment.

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Observation and analyses of transport and diffusion of warm discharge water from the power plants near Shidongkou in the Changjiang Estuary

ZHANG Shen-Yu, ZHU Jian-Rong

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 101-111. DOI: 10.3969/j.issn.1000-5641.2016.02.013

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The transport and diffusion of warm discharge water from the power plants near Shidongkou in the Changjiang Estuary were analyzed based on the observation data from November 23 to December 2 in 2014. During the spring tide, in terms of the longitudinal distribution of water temperature, warm discharge water from the power plants was evident, and had the maximum water temperature rise of 4.1oC in ebb tide, and of 5.1oC in flood tide; water temperature was stratification only near the discharge port, and trended to vertical uniform in other area due to strong mixing induced by tidal current. In terms of horizontal distribution of water temperature and water temperature rise, water temperature was higher along the coast and lower away from the coast, and reached the maximum value of 4.0oC near the discharge ports of Huaneng Shidongkou power plants during the ebb tide. The warm discharge water was transported and diffused downstream along the coast forced by the ebb current and Coriolis force. Compared during ebb tide, the higher temperature water near the Shidongkou move upstream and farer away the coast during flood tide, the maximum water temperature rise reached to 4.2oC. In terms of current speed and direction, water temperature measured at the continuous sites, water temperature rise during flood tide if the measured sites located in the upper reaches of the power plant, and descend during ebb tide if the measured sites located in the lower reaches of the power plant, was influenced distinctly by the near warm discharge water from the power plants. The more the measured site closer to discharge port of power plant, the higher the water temperature was, and the more obvious the vertical variation was. During the neap tide, water temperature was lower than during spring tide due to the passage of the cold front and heat loss at the river surface, the maximum water temperature near the power plant appeared at the middle water layer. The distribution characteristic of warm water rise was similar to the one during spring tide. The maximum warm water rise reached to 5.0oC which was higher 0.8oC than the one during spring tide because the tidal current and mixing was weaker during neap tide, and the higher temperature water near the warm water discharge port was not easy to be outward transport and diffusion.

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Numerical simulation about temporal and spatial variations of overtopping flow flux at the south leading jetty in the deep waterway project of the Changjiang Estuary

XU Peng, GE Jian-Zhong, DING Ping-Xing, FU Gui

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 112-127. DOI: 10.3969/j.issn.1000-5641.2016.02.014

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A numerical model based on the insitu measured topographic data was implemented, using the unstructuredgrid, threedimensional primitive equation, finitevolume coastal ocean model (FVCOM) including a dikegroyne module, for the study of temporal and spatial variations of overtopping flow at the south leading jetty constructed in the deep waterway channel. We investigated the temporal and spatial changes of overtopping flow by computing crosssection water flux before and after the project. The hydrodynamic condition around the north passage showed noticeable changes after the building of dikes and groynes. After the construction, respectively, net lateral current between the two channels points to the north passage with a relatively large amount of discharge. As estimated, spatially varying unit width net overtopping water flux had a significant feature, which was bounded at the corner, showed that the flux increased gradually at the upper half and decreased at the latter with a larger value. On a time scale the amplitude appeared no remarkable changes seasonally but on the other hand paced periodically in a tidal cycle. Moreover, the results showed a strong linear correlation between net water flux and tidal level.

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Design and application of saltwater intrusion forecastingsystem in the Changjiang Estuary

TAO Ying-Jia, GE Jian-Zhong, DING Ping-Xing

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 128-143. DOI: 10.3969/j.issn.1000-5641.2016.02.015

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Based on a highresolution and wellvalidated FVCOM model, a saltwater intrusion forecasting system in the Changjiang Estuary has been set up.A WRF model is also applied to predict the wind speed and direction in the Changjiang Estuary and its adjacent sea. The forecasting system can forecast threedimensional spatial distribution of salinity in the Changjiang Estuary at each moment during the following three days (72 hours).The forecasting system downloads the forcing data, runs the WRF and FVCOM model, visualizes prediction results and publishes the results. All the above operations are automatically processed by computer.The system was validated by hindcasting salinity of two stations, which are Baozhen and Chongxi at South Branch, during January 2011. The comparison of salinity between system hindcasted value and observation show the system is reliable. The system, with advantages of convenient operation and automatic procession, forecasts the saltwater intrusion in the Changjiang Estuary easily and timely.

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Ultrasensitive detection of protein biomarker using fluorescent quantum dot probes

WU Si-Min, JIA Chun-Ping, LIU Li-Fen, GAO Wan-Lei, JING Feng-Xiang, Jin-Qing-Hui , ZHANG Hong-Feng, ZHAO Jian-Long-

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 144-152. DOI: 10.3969/j.issn.1000-5641.2016.02.016

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In this study, based on the unique properties of quantum dots (QDs) and immune magnetic beads, an fluorescent assay was built to detect low concentration carcinoembryonic antigen (CEA). The assay was carried out in a sandwich formation in which two antibodies simultaneously recognized two separate binding sites on the same target CEA. After enrichment with magnetic separator, the fluorescent intensities produced by the QDs, which were confined to the surface of the beads, could be read efficiently to quantify the concentration of the CEA. For this assay, the limit of detection was 38 pg/mL with the linear range was from 0.39 to 50 ng/mL, and it has been proved with high accuracy and repeatability in tumor marker control. With the high sensitivity, specificity and low sample consumption, this method takes a big step to the early diagnosis of diseases.

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New records for alien plants in Shanghai

LI Hui-Ru, WANG Yuan, MA Jin-Shuang

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 153-159. DOI: 10.3969/j.issn.1000-5641.2016.02.017

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Ten new alien species belonged to ten genera and nine families, are recorded in Shanghai, including Rumex maritimus L., Chenopodium acuminatum Willd., Aubrieta deltoidea (L.) DC., Trifolium resupinatum L., Malva pusilla Sm., Anagallis arvensis L., Verbena bonariensis L., Leonurus macranthus Maxim., Stachys arvensis L.and Panicum miliaceum L.. Among them, A.deltoidea (L.)DC. and T.resupinatum L. are new record for alien plants in China.

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Effect of redox condition on metal transformation in urban river sediments

ZHANG Mi, WEN Bo, HUANG Ling-Xia, DU Jing, DENG Hong-

Journal of East China Normal University(Natural Sc 2016, 2016 (2): 160-. DOI: 10.3969/j.issn.10005641.2016.02.018

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The sediments from Yinchu Lake and Liwa River were studied for the effects of redox changes on Zn and Fe transformation. A simulated experiment was conducted with 4 different redox treatments：aerobic (+O), anaerobic (-O), aerobic then anaerobic (+O→-O) and extensively anaerobic (--O). Compared with anaerobic condition (-O), percentage of oxidizable Fe decreased from 5.53% to 4.60% in the sediment from Yinchu Lake under aerobic condition, while reducible and residual Fe increased from 13.77% to 16.20% and from 81.08% to 83.49%, respectively. Furthermore, the concentration of Fe release in the supernatant was decreased. Percentage of Zn in acid extractable, reducible and FeMn oxides fraction were respectively declined from 30.14% to 29.16%, from 25.40% to 23.90% and from 35.73% to 32.72% in the sediment from Yinchu Lake. However, Zn in residual fraction rose from 32.73% to 35.92% after treated with oxygenenation, which decreased the concentration of Zn release in the supernatant. It indicated that Fe and Zn in FeMn oxides fraction and organic matter fraction had good corrections with each other. Our study would provide scientific basis for risk analysis and evalution on eutrophicated urban river in the process of ecological restoration.

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A linear compact scheme for the nonlinear Schr"odinger equation with wave operator

LI Xin, ZHANG Lu-Ming, CHAI Guang-Ying,

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 1-8. DOI: 2016.03.001

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In this paper, a linear compact finite difference scheme is proposed for the nonlinear Schr"odinger equation with wave operator (NLSEWO). Thus, the periodic initial value problem of the NLSEWO is solved. The unconditional stability and convergence in maximum norm with order O(h[4]+tau[2]) are proved by the prior estimations and the energy method. Those theoretical results are demonstrated by a numerical experiment.

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High order interpolation function for surface contact problem

FENG Yun-Qing, HOU Lei

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 9-20. DOI: 2016.03.002

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This paper mainly adopts Lagrange bicubic shape function to construct interpolation function and uses finite element method to solve the coupling equations of surface contact. The Lobatto points are used to construct the interpolation nodes to avoid the Runge phenomenon. Higher shape functions and two different numerical integration methods are adopted to improve the accuracy of the numerical solution. According to the above analysis, this article uses Matlab program to simulate the deformation and stress changes in surface contact problem.

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vec estimates of solutions to the Cauchy problem of[2mm] one-dimensional convection-diffusion equations

ZENG Yan, XIN Gu-Yu

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 21-26. DOI: 2016.03.003

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This paper investigated the estimates of solutions to one-dimensional convection-diffusion equations frac{partial c}{partial t}+ufrac{partial c}{partial x}=Dc_{xx}+c_{xt}-(c{2})_{x}, using Green's function method, frequency decomposition and energy estimates. We found that the decay rate of the solution is the same as that for heat fusion operator

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A class of singularly perturbed weakly nonlinear boundary\\[2mm] value problems with interface conditions

WU Cheng-Long

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 27-38. DOI: 2016.03.004

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In this paper we study a class of weakly nonlinear boundary value problems with interface conditions. By means of the Schauder fixed point theorem we establish the theorem about a weakly nonlinear boundary value problem with interface conditions. By the method of boundary layer function, the formal asymptotic solution is constructed, which is used to prove the existence of the solution

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Bogdanov-Takens bifurcation for a delayed predator prey system with stage structure

LIU Xia, JIAO Jian-Feng

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 39-47. DOI: 2016.03.005

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In this paper the Bogdanov-Takens (BT) bifurcation of a delayed predator prey system with stage structure and constant harvesting is considered. The existing conditions which guarantee an interior equilibrium of the system is BT singularity are obtained and the corresponding normal form for the system at this singularity is presented, some bifurcation results are shown

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Quasi-stationary distributions for absorbing stochastically monotone Markov chains

ZHU Yi-Xia

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 48-59. DOI: 2016.03.006

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In this paper, we prove some limit theorems for absorbing stochastically monotone Markov chain during its lifetime. The emphases are on the stationary conditional, doubly limiting conditional and limiting conditional mean ratio quasi-stationary distributions. We study the uniqueness and domain of attraction of
three types of quasi-stationary distributions for stochastically monotone Markov chains. A sufficient condition for the uniqueness of the three types of quasi-stationary distributions is given in our main results and under this condition, the unique quasi-stationary distribution attracts all initial distributions. We apply the main results to birth and death processes.

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Improved collaborative filtering algorithm based on usersimilarity

WANG Wei, ZHENG Jun

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 60-66. DOI: 10.3969/j.issn.1000-5641.2016.03.007

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Collaborative filtering is widely accepted and applied currently as one of the most popular personalized recommendation methods. It is an implementation method based on content that has considerable advantages in accuracy. The core issue of collaborative filtering is how to work out the calculation of similarity. In this paper, we introduce the traditional collaborative filtering algorithm and make similarity calculation more accurately by optimizing the traditional formula of similarity. Experimental results show that the optimized algorithm can improve the accuracy of the recommendation and reduce the MAE (Mean Absolute Error, MAE) efficiently.

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One-loop analysis of nucleon-nucleon scattering in the chiral effective field theory

LI Fan, YANG Ji-Feng

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 67-75. DOI: 2016.03.008

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In this paper we will analyze the important one-loop pion-exchange diagrams for nucleon-nucleon (N-N) scattering in the relativistic framework of chiral effective theory, namely the triangle diagrams and the planar box diagram. On this basis, we wish to further explore the structures of the chiral effective theory in order to contribute to the establishment of a satisfactory effective field theory for nuclear forces

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SIM(2) gravitational gauge theory

WU Yi-Wei, XUE Xun

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 76-83. DOI: 2016.03.009

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Based on the anisotropies of CMB (Cosmic Microwave Background Radiation, CMB) on the large scale and Mach's principle,this paper proposed that the Lorentz invariance is violated from the length scale of galaxy. SIM(2) gauge theory was taken as an example of such motivation to illustrate the so called dark matter effect,the deviation of astronomical observation from Newton-Einstein prediction, which can be emerged from the accumulated Lorentz violation effect on the short scale. SIM(2) gauge theory was analyzed and 8 additional constrain equations were obtained in addition to the equation of motion, while the independent components of contorsion were also reduced to 8. It can lead us to the conclusion that the contorsion is non-trivial and can contribute an
effective energy-momentum distribution even in the region devoid of matter. Finally, the cylindrical symmetrized solution of metric under weak field expansion was given and its property was analyzed.

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Performance optimization scheme for a novel cooperation spectrum sensing system

ZENG Ying, LI Zhi-Yong, ZHANG Chun-Ping, TANG Jing-Min-

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 84-91. DOI: 10.3969/j.issn.1000-5641.2016.03.010

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In order to reduce effect of hidden terminal on cognitive system performance and the error rate of perceived system, it is proposed that, under the condition of considering wireless Rayleigh fading channel and reported channel with a fixed error probability, joint optimize index p of p power detector, optimal sensing threshold λand the best number of cooperative users K on multiple antenna sensing system with p power detector to minimize the total error probability. Theoretical analysis and simulation results show that cooperative spectrum sensing system has the best index p* and the best perception threshold λ*, and when choosing a fusion rule it can improve the reliability for sensing system by choosing appropriate cooperative users K.

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Comparative analysis of microbial communities on tobacco leaves between clone library and highthroughput sequencing

GONG Jun, LIU Yu-Pei, LI Yuan-Yuan-

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 92-101. DOI: 10.3969/j.issn.1000-5641.2016.03.011

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In order to compare the microbial communities on tobacco leaves between clone library method and highthroughput sequencing method, we analyzed the diversity of microbial communities based on bacterial 16S rDNA and fungal ITS on tobacco leaves collected from Fujian province in China. The results showed that more numbers of bacterial and fungal sequences were detected by highthroughput sequencing than clone library. The number of operational taxonomic units (OTUs) clustered from highthroughput sequencing method was almost the same as that from clone library method in bacterial communities, while that was higher from highthroughput sequencing in fungal communities. The rarefaction curves drawn from highthroughput sequencing method tended to approach the saturation plateau. The expected community diversity indices (Chao1 and Ace) were higher in clone library method, whereas the observed community diversity indices (Simpson and Shannon) suggested that higher bacterial diversities were detected through clone library method and higher fungal diversities were detected through highthroughput sequencing method. There were more kinds of bacteria and fungi genera identified through highthroughput sequencing method. The dominant genera of bacteria were similar detected from both of the methods, including Pseudomonas, Acinetobacter and Sphingonomonas. However, the fungal genera detected through these two methods were significantly different. Overall, novel highthroughput sequencing methods outperform clone library approaches in terms of resolution and magnitude. They enable identification and relative quantification of community members of tobacco leaves and offer new insights into environmental microbiology. 

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Extracellular ATP affects the copper–induced cell death and H2O2 production in tobacco (Nicotiana tabacum L) cell-suspension cultures

BAI Jing-Yue, FENG Han-Qing, GUAN Dong-Dong, SUN Kun, JIA Ling-Yun, LI Qiao-Xia, ZHANG Jin-Ping

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 102-114. DOI: 2016.03.012

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Extracellular ATP (eATP) has been considered as a mediating signal in several physiological processes of plants. In this article we showed that eATP can affect the copper-induced cell death and hydrogen peroxide (H_{2}O_{2}) production. CuCl_{2} at concentrations from 100 to 700 textit{mu }molL caused a
significant increase of cell death in tobacco (textit{Nicotiana tabacum} L) suspension cultures, and this increase of cell death level was followed with increases of both intracellular and extracellular H_{2}O_{2} production. The cells exposed to 300 textit{mu }molL CuCl_{2} were chosen to investigate the mechanisms for the copper-induced increases of cell death and H_{2}O_{2} production and the effect on this process. The results showed that the treatment_{ }with CuCl_{2 } at this concentration increased the activity of NADPH oxidase, and addition of DPI (diphenylene iodonium, an inhibitor of NADPH oxidase)alleviated the CuCl_{2}-induced increases of cell death and H_{2}O_{2} production, indicating that the CuCl_{2}-induced increases of cell death and H_{2}O_{2} production were related to an increase of the activity of NADPH oxidase. Addition of exogenous ATP at 50 textit{mu }molL into the CuCl_{2}-stressed cells further enhanced the levels of cell death,H_{2}O_{2} production, and NADPH oxidase activity. However, in the presence of DPI, exogenous ATP failed to do so. These observations indicated that eATP can affect the copper-induced changes of cell viability and H_{2}O_{2} production bystimulating NADPH oxidase

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Spatial evolution of science and technology innovation gravity center and its factors in China from 1996 to 2012: An analysis based on provincial data

LI Heng, DU De-Bin, XIAO Gang

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 115-124. DOI: 2016.03.013

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Regional science and technology (ST) innovation capacity plays an increasingly important role in regional socioeconomic development. On the base of current research, we introduced gravity center model to the regional differences research of China ST innovation and work out ST innovation gravity center and its evolution characteristics in the period of 1996-2012. We summarize the main factors which drive the evolution of ST innovation gravity center by comparative analysis and quantitative study. The results are showed as follows. The ST innovation gravity center has been moving quickly to the southeast direction in the past 16 years, and departure increasingly from the geometric center of China. There is a strong correlation between ST innovation gravity center and economic gravity center and Hi-tech Industry gravity center and RD investment gravity center. The main driving factors of China ST innovation gravity center movement consist of economic structure and growth mode,agglomeration of ST resources and ST innovation environment.

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Potential hazard assessment of typhoon storm surge based on scenario simulation methodology in Yuhuan County, Zhejiang Province

CHEN Jie, SONG Cheng-Cheng, LI Meng-Ya, WANG Jun-

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 125-135. DOI: 10.3969/j.issn.1000-5641.2016.03.014

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Typhoon storm surges are responsible for most of the damage caused by oceanic disasters in Yuhuan, Zhejiang Province. Considering the coastline features of Yuhuan County, 7 translation paths were designed based on the path of TC0608 (Saomai), which formed the lowest central pressure at the moment of landfall in Zhejiang since 1949. In consideration of the 7 translation typhoon paths and sea level rise, storm surges in 28 compound scenarios were simulated by using MIKE21 FM for potential impacts analysis. The results showed that the possibility of overtopping inundation due to typhoon storm surges was quite low under the present condition. However, the impacts obviously became more serious as sea level rising, and the three typhoons landing in the north of Yuhuan were especially sensitive in terms of responding to the sea level rose. In scenarios with the same sea level rise value, typhoons landing in the south of Yuhuan caused more serious inundation than those landing in the north part. In 2100, the largest water depth would reach 5.44 m and the inundation area would be 160.75 km2, accounting for about 35.93% of the total area of Yuhuan. The potential highrisk inundation areas are mainly distributed in the southeastern and western part of Yuhuan, with a relatively low elevation. The results could offer reference for making adaptation strategies and engineering countermeasures for future extreme storm surges disasters in Yuhuan County.

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Water and sediment transport mechanism in the Huangpu River Estuary, Shanghai

SONG Yong-Gang, LU Yong-Jin, LIU Xin-Cheng-

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 136-145. DOI: 10.3969/j.issn.1000-5641.2016.03.015

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Sediment transports in a bend channel affected by the tide are different from those dominated by the riverine flow. This paper used the flux decomposition mechanism method to examine the water and sediment transports in the Huangpu River Estuary, basing on the field observations in the 2002 flood season. The results showed that the water and sediment transports in the Huangpu River Estuary consisted of longitudinal and transversetransportsinduced by the secondary flow.The net water transport averaged over a tidal cycle points to the ebb direction, and the net sediment transport points to upstream dominated by the tidal pumping effect. The net transport of both water and sediment across the channel over a tidal cycle direct to the convex bank, in which an Euler transport predominated in water transport, and an advection transport controled sediment transport.Compared the longitudinal with the transverse water and sediment transport fluxes, we found that the crosschannel net water transports were bigger than alongchannel fluxes over a flood tidal cycle while crosschannel sediment transport fluxes were smaller than alongchannel fluxes, which implied that the tidal pumping played the major role in the net transports of sediment in the flood season.

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In consideration of tidal condition to improve optical inversion algorithm on total suspended matters concentration according to in situ measurement in the Yangtze Estuary

MA Hua, JIANG Xue-Zhong

Journal of East China Normal University(Natural Sc 2016, 2016 (3): 146-155. DOI: 2016.03.016

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Due to the interaction between the river discharge and the tide, as well as the high suspended sediment concentration in the surface water, the optical property of the Yangtze Estuary waters is different from the open sea waters. In a single tidal cycle, the total suspended maters (TSM) concentration can reach 0.5~kg/m{3} or more during spring tide, while in neap tide the maximum TSM concentration is only 1/3 of the spring tides. High TSM concentrations and a greater variation in single tidal cycle make a lot of empirical inversion algorithm unavailable in this region. A new algorithm was developed in the Yangtze Estuary, named improved complex proxy TSM (ICPTSM) model to improve the complex proxy TSM model. Using in situ synchronous optical and TSM concentration data
collected in the survey in May 2014, we analyze the characteristic of sediment concentration changing in the Yangtze Estuary associated within entire tidal cycle. Based on the original seven alternative bands, we introduce two alternative bands, 806~nm and 858 nm, as a supplement. We add a near-infrared peak area index as the fifth index to the complex proxy (CP). Linear relationship between the CP index and TSM concentration is improved into quadratic relationship. For water characteristics of different tidal conditions, individual ICPTSM models have been established. The results show that: ICPTSMmodel is adaptable in the Yangtze Estuary, distinction model toward spring and neap tidal have higher retrieval accuracy than unified model for a whole tide cycle, distinction model can better describe changes of water-leaving radiance, and TSM concentration changes in a tidal cycle

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