Journal of East China Normal University(Natural Science)

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A free boundary problem in variational inequality with gradient constraint

GUAN Chong-hu, CHEN Jing

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 1-10. DOI: 10.3969/j.issn.1000-5641.2018.01.001

Abstract （448）

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Consider a parabolic variational inequality with gradient constraint
min{vt-1/2σ²v_xx-μv_x+cv,v_x-1}=0.
The problem stems from a stochastic optimal control problem based on optimal dividend model. By using PDE technique and the penalty method, the existence and uniqueness and some a priori estimates of the solution of the variational inequality are obtained, and then the properties of the free boundary are further discussed. It is proved that the free boundary can be expressed as a function of x with respect to t and is a monotonically increasing, C^∞ smooth curve starting from zero.

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Edge-magic even-gracefulness of several kinds of spread network models

LI Yi-chun, SUN Hui, YAO Bing

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 11-16,23. DOI: 10.3969/j.issn.1000-5641.2018.01.002

Abstract （424）

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We present a new definition, called edge-magic even-graceful labeling in this paper, and then we discover a new algorithm, called firework operation, which can add leaves with edge-magic graceful labeling and edge-magic even-graceful labeling. We spread several kinds of network models based on the complete graph K₃ and star trees and so on, and then investigate their edge-magic even-graceful properties. A connection between the edge-magic odd-graceful labeling and the edge-magic even-graceful labeling is obtained which produces network models with edge-magic graceful labeling.

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Lipschitz-likeness and contingent derivative of an implicit multifunction

WANG Li-na, FANG Zhi-miao, LI Ming-hua

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 17-23. DOI: 10.3969/j.issn.1000-5641.2018.01.003

Abstract （433）

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In this paper by introducing a key assumption, we prove that the key assumption is equivalent to the Robinson metric regularity of the implicit multifunction and that under some suitable conditions the key assumption is sufficient for the Lipschitz-likeness (metric regularity) of the implicit multifunction. Finally, we establish the specific expressions of the contingent derivative and the second-order contingent derivative for the implicit multifunction.

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A stability theorem for solutions of general time interval multidimensional BSDEs with uniformly continuous generators

DONG Yong-peng, WANG Qian-ru, MA Jiao-jiao

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 24-34,49. DOI: 10.3969/j.issn.1000-5641.2018.01.004

Abstract （379）

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The existence and uniqueness of solutions for general time interval multi-dimensional backward stochastic differential equations (BSDEs) was proved in Fan et al. (2015) under assumptions that the generator g satisfies the Osgood condition in y and the uniformly continuous condition in z both non-uniformly with respect to t, and the i-th component g_i of g depends only on(w, t, y) and the i-th row of the matrix z. In this paper, by virtue of a uniform approximation of uniformly continuous functions by a sequence of Lipschitz functions, the theorem of Girsanov, and the Bihari inequality, we establish, for the first time, a stability theorem for the solutions of the general time interval multidimensional BSDEs with uniformly continuous generators.

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The existence of time-dependent attractors for abstract evolution equations with fading memory

HU Di-di, WANG Xuan

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 35-49. DOI: 10.3969/j.issn.1000-5641.2018.01.005

Abstract （415）

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In this paper, the long-time dynamical behavior of solutions for the abstract evolution equations with fading memory is investigated on time-dependent spaces. By applying the modified pull-back attractors theory, techniques of a priori estimate and operator decomposition, we verify the asymptotic compactness of the process. Furthermore, the existence and regularity of time-dependent global attractors are proved. This paper improves some known results.

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Meromorphic solutions of some type of system of differential and difference equations

YANG Yan-yan, WEI Wen-long, HUANG Zhi-gang

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 50-58. DOI: 10.3969/j.issn.1000-5641.2018.01.006

Abstract （437）

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This article investigates some properties of meromorphic solutions of the type of system of differential-difference equations of the following form

where n ≥ 4,p₁(z)、p₂(z) are non-zero polynomials, and h₁(z),h₂(z) are entire functions. By using Nevanlinna theorem, we have obtained the solution of above equation is unique. We also discuss the conditions for several types of system of differential-difference equations if the systems of equations actually pose meromorphic solutions of finite order.

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The transition and properties from Boolean networks to discrete-time Markov chains: A case study of mice stem cell gene regulatory networks

LYU Yue, ZHANG Min, QIN Xu-dong, YAN Jia

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 59-75,90. DOI: 10.3969/j.issn.1000-5641.2018.01.007

Abstract （476）

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This paper proposes a new method based on probabilistic model checking technique to solve the problem of detecting attractors in gene regulatory networks which is vital in bio-engineering. We transform a gene regulatory network into a discrete-time Markov chains (DTMC for short) by using truth table. We verify the possibility of gene activation in some "long term" through a model checker named PRISM, which help us to find attractors of the gene regulatory network. In this paper, we show the whole procedure using the example of mice stem cell gene regulatory networks. Meanwhile, we make a new technique of detecting the promotion/inhibition relations between genes by adding gene disturbance and modifying gene activation/suppression probability. We show that in the mice regulatory network, seven genes will remain their invariable states in some "long term", then the rest of "changing" genes forms a cyclic attractor. The experiment shows that our method can find the attractors easily and directly. Moreover, our experiment successfully finds those genes affected by gene Gata1, which would be helpful for studying the mice leucopenia.

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Data cleaning on probabilistic RDF database

WANG Zhen, LIN Xin

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 76-90. DOI: 10.3969/j.issn.1000-5641.2018.01.008

Abstract （316）

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Due to the factors such as errors and noises in the process of obtaining and analyzing data, uncertain data arises in many domains, which has emerged as an important issue affecting the performance of data. Uncertain data can be stored in probabilistic databases and query facilities always yield answers with confidence. However, the accumulation and propagation of uncertainty may reduce the usability of the query results. As such, it is desirable to reduce the uncertainty of uncertain data. This paper aims at solving the problem how to promote the answers' certainty in RDF(resource description framework) graph query via crowdsourcing. The basic idea is to ask the crowd to decide whether the relationships represented by some edges are correct. In this paper, we introduce three different algorithms to select the edge which maximizes the uncertainty reduction. Finally, we verify these algorithms by experiments and show that unstable pruning algorithm and stable pruning algorithm perform better in term of efficiency.

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Forward stagewise additive modeling for entity ranking in documents

WANG Yan-hua

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 91-102,145. DOI: 10.3969/j.issn.1000-5641.2018.01.009

Abstract （450）

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Key entities of a document can help to summarize the subjects of the events or the topics that the document describes, which can contribute to applications such as entity-oriented information retrieval and question-answering. However, entities in free text are unordered and hence it is important to rank entities of a document. In this paper, firstly, we make full use of features of entities that extracted from the document and draw support from Wikipedia and Word Embedding to generate external features. Then, we propose a novel ranking model named LA-FSAM(FSAM based on AUC Metric and Logistic Function) which is based on forward stagewise algorithm additive modeling. In LA-FSAM, we employ the AUC(Area Under the Curve) metric to construct the loss function and the logistic function to integrate features of entities. Finally, the stochastic gradient descent is utilized to optimize parameters of LA-FSAM model. After experiments, our evaluation shows the efficiency of the model we proposed.

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IM²: Improved MIN/MAX window functions optimizer in relational database

SONG Guang-xuan, ZHAO Da-peng, WANG Xiao-ling

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 103-116. DOI: 10.3969/j.issn.1000-5641.2018.01.010

Abstract （467）

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Window functions, also known as analytic OLAP functions, is a part of the SQL standard, and has been extensively studied during the past decade. And the window function has more and more extensive application prospects withthegrowthofthedemandstheanalyticalapplications. Despite its simple syntax, window functions can express many complex queries, such as ranking, moving average, cumulative sum and so on. Although almost all the current mainstream commercial database support window function, the existing implementation strategy is inefficient, and is not suitable for processing big data. In this paper, we propose the IM² algorithm, an improved algorithm for the MAX/MIN window functions, which effectively improves the efficiency. And we prove the effectiveness of the IM² algorithm the theoretical complexity analysis. Additionally, we implement the algorithm in PostgreSQL and conduct extensive experiments on real world data to demonstrate the efficiency of the IM² algorithm.

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Study on the near-field effect of spherical composite antenna arrays in the radio frequency simulation system

CHENG Bo, ZHU Shou-zheng, FU Lu, BIAN Jia-jun, YU Ting-xiang, ZHU Wei-hua, WANG Li-quan, PANG Xu-dong, ZHANG Yu, LIU Chao-jie

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 117-127. DOI: 10.3969/j.issn.1000-5641.2018.01.011

Abstract （408）

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The angular accuracy of target signal is affected by the near-field effect in the radio frequency composite array. This paper presents a new method to solve the problem. The radiation electric field distribution of a three-element sub-array located on the spherical composite antenna arrays at the receiving antenna location, which is usually located in the radiating near-field region, is precisely calculated by an hybrid technique of the full-wave algorithm and uniform geometrical theory of diffraction (UTD), in the case of the three-element array surrounded with its nearby elements working at same and different frequencies. The equivalent phase center of the three-element array is then obtained by the phase gradient algorithm (PGA) based on its phase distribution. The deviation of the equivalent phase center with that derives from the amplitude gravity center equation is calculated, which is used to find the corrected input power for each element antenna of the three-element array. The simulation results for a real composite antenna array system show that the maximum angular accuracy of pitching direction is corrected from 1.50/2.37 milliradian to 0.06/0.06 milliradian on the microwave three-element antenna and millimeter wave three-element antenna.

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Beam automatic detection wire scanner system design

SHAO Zhong-wei, HAN Ding-ding, GONG Pei-rong

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 128-134,145. DOI: 10.3969/j.issn.1000-5641.2018.01.012

Abstract （365）

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A beam automatic detection wire scanner system was developed to improve the measurement resolution and shorten the data processing time. The system managed the sampling process by multi-process priority mechanism, using Allen function to amplify signal variation characterization after signal processing. Fitting range was recognized based on short time average/long time average and Akaike information criterion, and fitting parameter initial values were determined by energy gradient curve. It is found that the system detects beam accurately and improves the measurement resolution and shortens data processing time.

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CFAR target detection algorithm based on dual-censoring threshold in non-homogeneous environments

LIU Gui-ru, WANG Lu-lin, ZOU Shan

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 135-145. DOI: 10.3969/j.issn.1000-5641.2018.01.013

Abstract （470）

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In order to solve the problem that the detection performance of the radar target detector decreases badly in non-homogeneous environments. Based on the actual echo clutter distribution, a dual-censoring threshold constant false alarm rate (DCT-CFAR) detector is proposed. Dual censoring threshold is used to remove the large and small unwanted samples and real-time accurate estimate the background noise power level. Compared with the simulation and analysis results of other detectors, the proposed detector has the best detection performance and stability in multi-interfering targets, masking effect, clutter edge and other non-homogenous environments. The results show that the proposed detector still has a good detection performance in non-homogeneous environments.

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Analysis of characteristics of the cold water patch off the Jiangsu coast in summer 2016

HE Zhan-yuan, ZHANG Wen-jing, ZHU Shou-xian, CHEN Yang, ZHENG Hou-jun

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 146-153,170. DOI: 10.3969/j.issn.1000-5641.2018.01.014

Abstract （416）

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In this paper, the analysis of characteristics of a cold water patch (CWP) off the Jiangsu coast is carried out based on in-situ oceanographic observations using CTD and remote sensing data made by the Advanced Very High Resolution Radiometer (AVHRR)in the period of summer 2016 from June to Augst. Analysis of the CTD data demonstrates that relatively cold waters occurred at different depths from the sea surface to 30 m over the study region in summer 2016, with the center of the cold waters leaning to the east at deeper depth. This confirms the transportation of cold subsurface waters from the bottom of the Yellow Sea to the Jiangsu coast. The distributions of monthly averaged AVHRR Sea Surface Temperature (SST) demonstrate the existence of CWP, the radius of which varies from 67.9 km to 85.8 km, the intensity from 0.5℃ to 1.2℃, the temperature difference between the CWP center and the coast at the same latitude from 1.9℃ to 2.9℃. The daily distribution of SST indicates that there are 78 days existing CWP, among which the maximum radius is 161.8 km, the maximum intensity is 2.8℃, the maximum temperature difference is 5.9℃. The daily position of CWP center ranges in a large area, the longest distance between two adjacent days is 125.4 km. The effect of the surface wind forcing on the cold water area is also examined using a correlation analysis of the estimated radius and intensity of the CWP with surface winds, which came to a conclusion the southerly wind plays an important role in developing the CWP.

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Geomorphic characteristics of the Siming Mountain (Zhejiang, China) based on ASTER-GDEM data analysis

XU Rui, DAI Xue-rong, SHI Yu-xin, ZHENG Li-bo, HE Shan-shan

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 154-162. DOI: 10.3969/j.issn.1000-5641.2018.01.015

Abstract （533）

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Based on ASTER-GDEM data, the geomorphic characteristics of the Siming Mountain (Zhejiang, China) are analyzed using ArcGIS. Parameters describing local relief, the Swath profile and Hypsometric Integral (HI) are applied. The results show that the Siming Mountain of NE-SW is controlled by fault structures. Area occupied by mid-elevation mountain, low-elevation mountain, hill and foothill is 0.6%, 16.2%, 32.7%, and 50.5% respectively; the mid-and low-elevation mountain have a low amplitude of relief (about 81 m). Swath profile analysis shows that the top of the Siming Mountain exhibits remnants of planation surface. When the planation surface was formed, the northeast tectonic activity was resurrected, which caused the basalt to cover it. The results show that the elevation of planation surface is close to the basalt elevation, whereby the southern parts of the mountain are higher by about 300 m than the north. The Hypsometric Integral analysis of each sub-basin reveals HI values are 0-0.35, 0.35-0.45 and 0.45-0.60, accounting for 47.31%, 30.58% and 22.11%. In this paper, the geomorphological features of the study area are simply divided by the HI value. It is found that the HI values in the study area are less than 0.6, and the landforms in the mature stage are subdivided according to elevation distribution in the EP chart, which are the older stage and the typical mature stage. The rest is corresponding to the old age of the landform, which indicates that the study area is now dominated by external force denudation.

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Spatio-temporal analysis about the primary productivity of Mentougou District in Beijing from 2003 to 2014

WANG Jiu-zhong, WU Ming-quan

Journal of East China Normal University(Natural Sc 2018, 2018 (1): 163-170. DOI: 10.3969/j.issn.1000-5641.2018.01.016

Abstract （374）

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Ten years NPP products of Mentougou District from 2003 to 2014 are generated using CASA model and Landsat remote sensing data. It is used to show the spatial distribution characteristic about Mentougou District' NPP. Inter-annual variability characteristic about Mentougou District' annual amount NPP is analyzed using MODIS17A3 products from 2003 to 2014. The intra-annual variability characteristic about Mentougou District' GPP was analyzed based on MODIS17A2 product in some typical years (namely 2004, 2007, 2008, 2009, 2011, 2012). The results show that the NPP of Mentougou District has a significant spatial differentiation characteristic that the value of NPP is low on median and it is high on other region. The NPP value is very low distributed along the river valleys. The annual amount NPP has no significant increasing or decreasing trend from 2005. GPP fluctuated significantly during the year. The differences in GPP/NPP between May and September contributed the most to the differences in GPP/NPP among different years.

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Existence and non-existence of global solutions for the wave equations

JIN Shou-bo, ZHANG Zu-feng

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 1-10. DOI: 10.3969/j.issn.1000-5641.2018.02.001

Abstract （429）

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In this paper we investigated the initial boundary value problem for a class of higher order wave equations with two opposite source terms. Firstly, we introduced the latest research progress of the wave equations and defined some important generalized functionals and sets, then the properties of the functionals were discussed. Secondly, it was proved that these sets were invariant under the wave equation. Finally, we proved the existence of global weak solutions by the combination of Galerkin approximation method and potential well method, and obtained the conditions of the non-existence of global weak solutions by using the potential well method and the convexity. The optimal threshold results were given for the existence and non-existence of global weak solutions.

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Global attractors for the coupled damped suspension bridge equations with linear memory

HUANG Shang-shang, MA Qiao-zhen

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 11-22. DOI: 10.3969/j.issn.1000-5641.2018.02.002

Abstract （451）

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In this paper, we investigate the long-time dynamical behavior of coupled suspension bridge equations with linear memory. We obtain the existence of the global attractors in the weak Hilbert space by using methods of energy estimates and contractive function.

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Exploring equivalent definitions of eulerian graphs

SUN Hui, YAO Bing

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 23-30,40. DOI: 10.3969/j.issn.1000-5641.2018.02.003

Abstract （366）

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From the topic of equivalent propositions of eulerian graph to start our study, we try to dig the topology of eulerian graph, and to describe eulerian graph from the view of different insights. Finally, we obtain four new equivalent propositions of eulerian graph by the technique of "concentration" and "dilution" operations, which can be transformed into two feasible algorithms.

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Approximation properties of the left quasi-interpolants Gamma operators in Orlicz spaces

HAN Ling-xiong

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 31-40. DOI: 10.3969/j.issn.1000-5641.2018.02.004

Abstract （338）

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In order to reach better approximation degree, people start to study the quasiinterpolants of operators. In this paper, approximation properties of left quasi-interpolants Gamma operators are discussed by the tools of Ditizan-Totik modulus, K-functional, Hölder's inequality, Cauchy-Schwarz's inequality and Laguerre polynomials and so on. Then we obtain the direct, inverse and equivalence theorems which generalize the results of left quasi-interpolants Gamma operators in L_p space and improve the approximation properties of Gamma operators in Orlicz spaces.

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Efficient verifiable privacy-preserving recommendation system

SONG Chun-zhi, DONG Xiao-lei, CAO Zhen-fu

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 41-51,62. DOI: 10.3969/j.issn.1000-5641.2018.02.005

Abstract （415）

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To address the problem of privacy disclosure in traditional personalized recommendation systems, this paper proposes an efficient verifiable privacy-preserving recommendation system, which can provide user the way to verify the correctness of the resulting model of cloud computing under the premise of protecting user's data privacy. This paper uses ridge regression to find the best-fit linear curve of user's input data, and implements Yao's garbled circuit to realize the computation and the correctness verification of the recommendation model. The user and the cloud use a newly-devised privacy preserving data aggregation method named AGG (Aggregation) to replace public key homomorphic encryption used in most existing work, which can reduce the computational overhead of the user and the cloud, thus making the system more efficient. The security analysis and the efficiency analysis of the scheme are given at the end of the article.

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Balancing travel satisfaction algorithm for multi-day trip planning

XU Kan, ZHENG Jun

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 52-62. DOI: 10.3969/j.issn.1000-5641.2018.02.006

Abstract （369）

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Location-based service is a kind of service that obtains the location of mobile user and provides it according to location. Among them, one of the active topics is trip planning. People can make different trip planning to meet their multiple requirements by location-based service. However, in most studies, trip planning only focus on searching one route in many locations according to user's demands. When people are trying to visit the city more than one day, the travel satisfaction of the routes provided by previous researches would reduce by day. Hence, the previous work cannot meet the requirement of multi-day trip planning. To improve the satisfaction stability of multi-day trip planning, we use trip day as one of the multi-day travel planning parameters. We acquire points of interest (POIs) information (e.g., location, scoring, category, etc.) and construct a POI network model, obtain optimal trip routes through heuristic algorithm, develop an effective multi-day travel planning. The experimental results demonstrate that our proposed method can plan a multi-day trip with high quality and more balanced route.

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Detection of fake plate vehicles based on traffic data stream

LI Min-xi, MAO Jia-li, YUAN Pei-sen, JIN Che-qing

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 63-76,100. DOI: 10.3969/j.issn.1000-5641.2018.02.007

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Since vehicles using fake plate violate traffic laws and regulations, infringe the rights of legal license owners and harm social benefits, it is therefore of great urgency to solve this social problem. In current detection methods, unified speed threshold is used to detect fake plate vehicles. Once an inappropriate threshold was set, it would lead to misjudgements and omissions, and thereby results in a low judgement accuracy. To solve this problem, we propose a two-phase fake plate vehicles detection framework. In the offline part, we train a distributed speed model based on sparse traffic trajectory data to calculate time-dependent thresholds for different roads. In the online part, we apply a sliding-window method to monitor whether a car is an outlier. If a car is continually detected as an outlier, it will be judged as a fake, and vice versa. We then use a real dataset to evaluate our method. The results demonstrate negative influences of noise data can be avoided by our method, so the accuracy of fake plate vehicles detection can be improved significantly.

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Woodpecker: Fine-grained contention simulation database testing framework

LI Jie-ying, LI Yu-ming, ZHANG Xiao-lei, ZHANG Rong

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 77-88. DOI: 10.3969/j.issn.1000-5641.2018.02.008

Abstract （398）

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With the rich and the growing peformance requirement of applications, various database developments appear, such as row-based, column-based, main memory database and so on. Hence database testing becomes more and more important. Existing automated testing frameworks of database have some problems in flexibility of test, integrality of function and the granularity of test. Firstly they can't support functional test, performance test and DBMS functional test at the same time. Secondly popular benchmark TPC-C simulates workload contention by warehouse which can't quantify contention and maybe execution is different with expectation. Finally the use of test case is static, they can't organize and run test case dynamically. As a consequence this paper presents a flexible database testing framework which is called Woodpecker, its test task descriptive language has abundant primitives, easy-to-use and could write test case efficiently. Woodpecker is the first test framework that can mix three above-mentioned tests in one test case, and simulates workload contention in fine granularity which include read-write contention and write-write contention. We use a simple case in auto increment testing to show the descriptive language's advantage, last we verify the capacity of mixing three tests in Woodpecker, and besides, we show the results of workload contention simulation in performance test.

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Design and implementation of PK answer based on WebSocket

ZHU Xiang, DONG Qi-wen, YU Ke-ren

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 89-100. DOI: 10.3969/j.issn.1000-5641.2018.02.009

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The development of the Internet has brought great convenience to people's life and work, at the same time, people have more demand for Internet applications. How to help students answer questions onlineis increasingly becoming a reality demand for primary and secondary schools as well as online education platforms. From this realistic demand, an online PK (Player Killing) answer function is proposed. Through the online PK answer, students' interest in learning and their ability to grasp knowledgecan be enhanced.

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Electrical manipulation of Rashba spin-orbit coupling in the two-dimensional transition metal dichalcogenide

YAO Qun-fang, CAI Jia, GONG Shi-jing

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 101-108. DOI: 10.3969/j.issn.1000-5641.2018.02.010

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Using the first-principles density functional theory calculations, we investigate the Rashba spin-orbit coupling of the transition metal dichalcogenide (TMD) monolayers MX₂(M=Mo, W; X=S, Se, Te) induced by the external electric field. It is found that the anions X play an important role on the Rashba spin-orbit coupling effect. With the increase of the atomic number of X, Rashba spin-orbit splitting around the Γ point increases more distinctively, and the external electric field can hardly influence the cations because of the coverage by the anions. Thus the strength of the Rashba spin-orbit coupling follows the sequence:WTe₂ > MoTe₂ > WSe₂ > MoSe₂ > WS₂ > MoS₂. Furthermore, the distribution of the spin polarization along the high symmetry line Γ-K/K' turns from the vertical direction to the two-dimensional plane under the external electric fields, and the in-plane spin polarization distribution rises with the increase of the external electric field.

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Coherent acoustic phonon inmagnetic thin films excited by femtosecond laser

YAN Jia-qi, LI Wei, LOU Shi-tao, ZHANG Xiao-lei

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 109-114. DOI: 10.3969/j.issn.1000-5641.2018.02.011

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The interaction between the femtosecond laser pulse and the MnIr layer in the magnetic thin film excites the coherent acoustic phonon with an initial phase of 90° and a propagation velocity of 4 300 m/s. The vibration frequency of the acoustic phonon is independent of the laser energy density and is inversely proportional to the total thickness of the magnetic thin film. And the acoustic phono can propagate in the adjacent metal layers due to the high lattice matching. The electron temperature in the magnetic thin film increases sharply absorbing by femtosecond laser pulse, then an decreasing electron temperature gradient with increasing depth is generated instantaneously by the absorption of the laser which lead to the lattice oscillate coherently in the depth direction, that is, the acoustic phonon. In addition, the frequency of the acoustic phonon changes caused by the applied magnetic field is within the experimental error range, indicating that the magnetic interaction is very weak compared to the electrical interaction in the lattice.

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Luminescence characteristics of Eu²⁺-activated white-emitting phosphor prepared from solar cell cutting Si powder

YU Xin-yang, CAI Ya-guo, SUN Zhuo, PIAO Xian-qing

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 115-124. DOI: 10.3969/j.issn.1000-5641.2018.02.012

Abstract （409）

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Eu²⁺-activated white-emitting phosphors were synthesized by the process of ammonia nitridation at high temperature with the raw material of silicon powder from crystalline silicon solar cells cutting sludge. The effect of Eu²⁺ doping concentrations on structural and luminescent properties of phosphors was studied in detail. It turns out that the principal crystalline phase of the sample is the mixture of Ca₂SiO₄, CaSiO₃ and Ca₂Si₅N₈. These phosphors can be effectively excited in the range of 300~450 nm, showing intense absorption in ultraviolet to near-ultraviolet region. In addition, they exhibit intense white emissions with CIE (Commission Internationale de L'Eclairage) coordinates of (0.327 5, 0.386 6) under 370 nm excitation with color temperature of 5 705 K(5 431.85℃). There are two luminescence centers in the host, which locate at 470 nm and 570 nm, respectively. With the increase of the doping concentration of Eu²⁺, the emission reaches an intensity saturation and the optimum doping content of Eu²⁺ is 10.0 mol% due to the interaction among the activator ions which result in an concentration quenching. Using such a single phosphor, a white light output can be directly achieved combined with UV chip.

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Research progress of the target proteins by proteasome activator REGγ in human cancers

CHEN Shao-jun, LI Xiao-tao, ZHENG Jun-hua

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 125-130,159. DOI: 10.3969/j.issn.1000-5641.2018.02.013

Abstract （534）

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The proteasome activator REGγ, which is a member of REG (11 S) proteasome activator family, can stimulate the proteolytic activity of the 20 S core proteasome to degrade proteins independent of ubiquitination and ATP. In recent years, more and more studies show that REGγ is dysregulated in various human cancers and closely related to the oncogenesis and development of cancers. The potential mechanism by which REGγ exerts its role in cancer development is degradation of various target proteins. We now review the target proteins of REGγ in human cancers in order to further understand the mechanism by which REGγ exerts its role in cancer development, and to uncover the potential of REGγ to serve as a new marker for diagnosis and a novel target for treatment in human cancers.

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Studies of seasonal variation on genetic toxicity of typical fine particulate matter samples in Shanghai

ZHANG Ying, YANG Jing, CHEN Xiao-qian, YANG He-xing, YIN Hao-wen

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 131-140. DOI: 10.3969/j.issn.1000-5641.2018.02.014

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To explore the genetic toxicity on different components of PM_2.5 in Huinan and Pudong during winter and summer, the SOS chromotest is used to detect the genetic toxicity of the total particulate, the organic extract and the water-soluble component. Results shows that tests of the genetic toxicity on the total particulate in Huinan are positive at the highest concentration of 2 mg·mL^-1 both in winter and summer, also are positive in Pudong respectively at the concentration of 1 mg·mL^-1 in winter and at the highest concentration of 2 mg·mL^-1 in summer. Tests of the genetic toxicity at two stations both in winter and summer on the water-soluble component are positive at the highest concentration of 2 mg·mL^-1and negative on the the organic extract in the range of 0.000 2 mg·mL^-1and 2 mg·mL^-1. To further compare the genetic toxicity of the PM_2.5 in Huinan and Pudong during winter and summer when exposed to the same volume air, the genetic toxicity of the different components are expressed as the content of the 4-nitroquinoline oxide (4-NQO) per cubic meter of air. Results indicat that the genetic toxicity of the fine particulate matter in Shanghai Puding and Huinan is seasonal and higher in summer than in winter. Furthermore the genotoxic component and the concentration of the total particulate and the water-soluble during winter and summer may be different. It, combined with the result of existing studies that pollutants concentration or components of fine particulate matter were generally higher in winter than in summer at multiple sites in Shanghai, is speculated that the genetic toxicity of atmospheric particulates in every part of Shanghai has similar seasonal change rule. The genotoxic effect of the organic extract is not significant. The main source of the genetic toxicity in the fine particulate matter may be the water-soluble component. The atmospheric pollution at Pudong stationwas continuously serious and equivalent to Huinan stationon the pollution level and the genetic toxicity in same seasons. It is speculated that the genotoxic chemical compositions of atmospheric particulate matter at Pudong station and Huinan station are similar.

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Pollution effects of atmospheric deposition on heavy metals in leafy vegetables and its health risks

ZHOU Xiao-xiao, BI Chun-juan, WANG Meng, ZHOU Ya, CHEN Zhen-lou

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 141-150. DOI: 10.3969/j.issn.1000-5641.2018.02.015

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In order to study the pollution effects of heavy metals in atmospheric deposition on leafy vegetables and health risks via consuming vegetables, this research chooses a farmland near the suburban Shanghai as a study area, makes comparative analysis of heavy metal contents in vegetables samples, including Shanghai Green cabbage, leaf lettuce, amaranth and water spinach, both in outdoor and greenhouses, and makes the health risk assessment of the edible parts of vegetables using the target hazard quotient (THQ). The results show that the heavy metal contents of the vegetables in outdoor are higher than those in greenhouses. The average contents of Zn, Cr, Cu, Pb, Cd, Hg, and As in outdoor vegetables are 7.32, 0.91, 0.52, 0.007, 0.029, 0.002, and 0.014 mg·kg^-1, respectively; among which, the contents of Zn, Cr, Cu, Cd, and Hg are 26.4%, 28.4%, 83.3%, 33.9%, and 14% higher than those in greenhouses, respectively. The enrichment factors of greenhouse vegetables are higher than those of outdoor vegetables, showing that the heavy metals of outdoor vegetables are greatly influenced by atmospheric deposition. Different vegetables have different enrichment capacity of heavy metals. Amaranth has the strongest enrichment capacity for Zn, Hg, As and Cu; while water spinach has the most powerful enrichment capacity for Pb. TotalTarget Hazard Quotient (TTHQ)values ofvegetables in outdoor are between 1.41 to 2.99 with an average of 2.29; while those in greenhouses are between 1.10 to 2.19 with an average of 1.85, which is 23.4% lower than the outdoor values. There is a threat for the health of adult and children. The risk of consuming vegetables in outdoor is higher than that in greenhouses. Atmospheric deposition is one of the important sources of heavy metals in vegetables. Hence, we suggest to avoid outdoor cultivating vegetables in high risk areas with atmospheric pollution of heavy metals, thus reducing the impact of atmospheric deposition on enrichment of heavy metals in vegetables.

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Geochemical characteristics of the peat profile in the Yangbajing basin, Tibetan, China and its paleoenvironmental implications

MENG Qing-hao, NIU Rui, ZHENG Xiang-min, Zhou Li-min, SUN Cheng-cheng, WANG Lin

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 151-159. DOI: 10.3969/j.issn.1000-5641.2018.02.016

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The peat contains abundant information about climate change.In this study, the ratios of characteristic elements in the Yangbajing basin, Tibetan Plateau, are found to be an good indicator for evaluating the regional sedimentary environment (e.g., the change of wet and dry stages), according to the analytical results of special element rations (Fe/Mn, Ba/Sr, K₂O/Na₂O), humification and mercury (Hg) records in the peat cores. The paleoclimate evolution in the Yangbajing basin is classified as three stages as revealed by the elemental geochemical records:Temperature fluctuates and shows an overall increasing trend between 9.1~7.6 cal ka BP. The sedimentary environment is relatively wet during this period. Significant and frequent fluctuation of temperature is observed between 7.6~4.5 cal ka BP. The sedimentary environment tends to be dry; the temperature fluctuats less and shows a decreasing upward trend 4.5~3.5 cal ka BP. The sedimentary environment tends to be warm and wet. A total of four drying events are recorded in the peat profile, which occurs at approximately 5.8, 6.1, 8.2 and 8.8～8.5 cal ka BP, respectively. The four events recorded in the peat core in the Yangbajing basin are consistent with the regional and global climate records.

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Analyses of saltwater intrusion at the water intake of Qingcaosha reservoir in the Changjiang Estuary in dry season from 2015 to 2017

LI Guo-ping, ZHU Jian-rong

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 160-169. DOI: 10.3969/j.issn.1000-5641.2018.02.017

Abstract （388）

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Based on the measured salinity at the upper and lower water gate of Qingcaosha reservoir from January to Match from 2015 to 2017, and combined the measured river discharge at Datong station, wind at weather station at Chongming eastern shoal, water level at Baozhen hydrologic station and salinity at Chongxi hydrologic station, the frequency and source of saltwater intrusion at the water intake of Qingcaosha reservoir in the last three years were analyzed. The frequencies at the water intake of the reservoir from January to March in 2015, 2016 and 2017 were three, one and one of saltwater intrusion, respectively. Only one time of saltwater intrusion in the dry season of 2016 and 2017 occurred due to the higher river discharge. Among the total five times of saltwater intrusion happened at the water intake from January to March in the last three years, only one of saltwater source was from upstream, i.e., the saltwater-spilling-over from the North Branch into the South Branch, which took about 3 days for the saltwater moving from the Chongxi hydrologic station to the water intake of the reservoir; Four times of saltwater source were from downstream, i.e., the saltwater intrusion through the North Channel, which appeared in neap tide or medium tide after neap tide, was weaker under general wind speed, and was stronger under strong north wind. In view of the saltwater intrusion at the water intake of Qingcaosha reservoir in the last three years, the frequencies of saltwater intrusion coming from the downstream of the North Channel were increased distinctly, and the saltwater intrusion would be severe if strong north wind occurs in neap tide.

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Study of the ebb sediment diversion ratios during wet season in the South and North Passage, Changjiang Estuary

YANG Wan-lun, DAO Fu-hai, LUAN Hua-long, GE Jian-zhong, DING Ping-xing

Journal of East China Normal University(Natural Sc 2018, 2018 (2): 170-180. DOI: 10.3969/j.issn.1000-5641.2018.02.018

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This study investigates the characteristics of the ebb water and sediment diversion ratios during wet season in the North Passage, Changjiang Estuary and the reasons for the differences within neap-spring tidal cycles based on field measurements. The results of the measurements indicate that the averaged ebb flow diversion ratios of the North Passage in spring and neap tide are 41.9% and 43.1%, respectively, while the averaged ebb sediment diversion ratios of the North Passage in spring and neap tide are 35.1% and 39%,the averaged ebb sediment diversion ratios of the North Passage in spring can approximate representatively ebb sediment diversion status. The ebb sediment diversion ratio of the North Passage is dependent on the ratios of mean flow velocity, suspended sediment concentration and section areas of the North and South Passage. And these parameters show minor changes within neap-spring tidal cycles. Therefore, it can be concluded that the differences of ebb flow and sediment diversions of the North Passage within neap-spring tidal cycles are limited.

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A note on Kronecker's double sum and non-holomorphic Eisenstein series

SHEN Li-chien

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 1-17. DOI: 10.3969/j.issn.1000-5641.2018.03.001

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A family of non-holomorphic Eisenstein series of weight k and level N is generated from twisting of the Kronecker double series by Dirichlet characters and from which we will derive its representation in terms of the Whittaker function and the functional equation for the Eisenstein series.

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Hom-spaces for subregular nilpotent representations of sl(n+1)

LI Yi-yang, SHU Bin, YE Gang

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 18-24,45. DOI: 10.3969/j.issn.1000-5641.2018.03.002

Abstract （351）

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Let g=sl(n+1) be the special linear Lie algebra over an algebraically closed field k of prime characteristic p with p

n+1. We show that the hom-spaces between any two baby Verma modules in the same given block are always nonzero for subregular nilpotent representations of g, which reveals a complete linkage atlas for baby Verma modules.

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Irreducible sl₂-decomposition for a highest weight sl₂-module

CHAI Wei-jun, XIA Li-meng

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 25-29. DOI: 10.3969/j.issn.1000-5641.2018.03.003

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In this paper, we study the irreducible highest weight module L(Λ₀) of affine Lie algebra

. Since the three-dimensional simple algebra sl₂ is regarded as a Lie subalgebra of

, L(Λ₀) naturally becomes a sl₂-module. We present the irreducible decomposition of L(Λ₀) as a sl₂-module.

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The explicit structure of projectively flat Finsler metrics with three parameters

LIU Jin-meng, SONG Wei-dong

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 30-37. DOI: 10.3969/j.issn.1000-5641.2018.03.004

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In this paper, projectively flat Finsler metrics are considered. A class of projectively flat Finsler metrics with three parameters are formed. Moreover, the sufficient and necessary conditions for the measurement to be considered projectively flat was obtained. In particular, the flag curvature expression of projectively flat Finsler metrics are presented.

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L² harmonic 2-forms on a hypersurface in Euclidean space

ZHANG Quan-rui, LIU Jian-cheng

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 38-45. DOI: 10.3969/j.issn.1000-5641.2018.03.005

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In this paper, we study L² harmonic 2-forms on a complete hypersurface M of Euclidean space Rⁿ⁺¹(n ≥ 3). By applying the Bochner technique, we prove that if the Lⁿ(M) norms of the traceless second fundamental form Φ and the mean curvature vector H are both bounded from above by certain constants which depend only on n, then the L² harmonic 2-forms on M are parallel. Furthermore, if M is a non-minimal hypersurface, then there is no nontrivial L² harmonic 2-form on M.

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AM(s)-Convex function and its Jensen-type inequality

SONG Zhen-yun, HU Fu-gao

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 46-54,120. DOI: 10.3969/j.issn.1000-5641.2018.03.006

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Based on the convexity and general convexity of a function, the authors study extending issues of a convex function. Firstly, the concept and sign of weighted r-th power s-mean of n positives are introduced; secondly, the AM(s)-convex function is defined by weighted r-th power s-mean; thirdly, the judgment theorem and operation properties of AM(s)-convex function are discussed; and finally, the Jensen-type inequality of the AM(s)-convex function is proved and an equivalent form is provided. The study shows that the AM(s)-convex function is a subset of general convex functions that includes many convex functions. Studying the AM(s)-convex function with the method of weighted r-th power s-mean is an effective way of extending and studying convex functions. This method explores a new approach to extending and studying convex functions.

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Chinese named entity relation extraction for enterprise knowledge graph construction

SUN Chen, FU Ying-nan, CHENG Wen-liang, QIAN Wei-ning

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 55-66. DOI: 10.3969/j.issn.1000-5641.2018.03.007

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The enterprise knowledge graph is a kind of domain knowledge base for the financial field to describe business relationships between enterprises. Although the domain knowledge graph is not broadly covered in the field, the precision of the knowledge is better than with an open knowledge graph. Despite the fact that open knowledge graphs have made significant advancements in recent years, vertical fields-especially business-have not seen in-depth applications in practice; this has resulted in significant demands on the enterprise knowledge graph. This paper proposes a Chinese entity relation extraction method based on classification for the limitation of extraction results. In this method, the maximum entropy model is used to analyze the data of selected companies' announcements to determine the optimal feature template. The results show that accuracy rates reach over 85% in the enterprise bulletin data set.

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Algorithm for service optimization under multi-QoS constraints for data services in a food traceability system

YUAN Pei-sen, LI Wei, REN Shou-gang, XU Huan-liang

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 67-76. DOI: 10.3969/j.issn.1000-5641.2018.03.008

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The concept of data services plays an important role in the era of big data. In this paper, an optimization algorithm for web services in food safety traceability is investigated based on the SOA (Service-Oriented Architecture) framework. Traceability services are commonly data-intensive systems, which need to combine multi-source web services. In this paper, by extracting important QoS (Quality of Service) indexes from the web and data services of the system, a multi-QoS based benefit ratio (MQBR) is established, which is then used on the traceability platform for food security management. Based on the MQBR model, the skyline and heuristic method of artificial intelligence is proposed for optimizing the efficiency and quality of service selection. Experiments are conducted to prove the validity of the algorithm. The methods of our study are designed and applied to a food security management application, with multiple QoS constraints in the traceability systems, to improve the overall performance and service quality.

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Algorithm for video click-through rate prediction

KUANG Jun, TANG Wei-hong, CHEN Lei-hui, CHEN Hui, ZENG Wei, DONG Qi-min, GAO Ming

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 77-87. DOI: 10.3969/j.issn.1000-5641.2018.03.009

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Click-through rate prediction has played an important role in video recommendation systems. A video recommendation system can suggest media to users based on the results of click-through rate prediction. In this way, users may be more likely to click the videos recommended by platforms. However, given the volume and imbalance of data in some applications, the accuracy of click-through rate prediction may be very low. To improve the performance, this paper proposes an integrated approach by combining feature engineering with techniques from machine learning. In the first stage, the algorithm uses feature engineering to extract user, video, and combinational features from the original dataset. In the second stage, the algorithm predicts the click-through rate by employing supervised models of logistic regression, factorization machine, and gradient boosting decision tree combined with logistic regression. The experimental results illustrate that the prediction accuracy of the factorization machine model and the gradient boosting decision tree combined with logistic regression model are better than the logistic regression model. Moreover, the cross combination of user and video features can improve the accuracy of the click-through rate prediction.

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The design and implementation of an efficient order management system based on Cedar

PAN Yu-chen, LI Yu-ming, ZHANG Chun-xi, ZHANG Rong, HONG Dao-cheng

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 88-96. DOI: 10.3969/j.issn.1000-5641.2018.03.010

Abstract （427）

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With the development of Internet, enterprises are increasingly relying on the Internet for core functionality of their business systems. Legacy business systems which were based on centralized data management platforms, such as MySQL, have shortcomings in usability when the systems are used on the Internet instead of for internal business processes. They are not suitable for supporting new business requirements which require scalability with concurrent transactions and conflict resolution. In this paper,we design and implement a scalable order management system which supports order storage, assigning orders, and order rushes using the distributed Cedar database and Netty communication framework. The characteristics are designed on the basis of an in-depth analysis of current business characteristics. We verify our design on real workload of a Haier system. The experimental results show that the proposed order management system has good scalability, high throughput, and low latency.

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Attribute reduction based on information entropy of approximation boundary accuracy

LIANG Bao-hua, WU Qi-lin

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 97-108,156. DOI: 10.3969/j.issn.1000-5641.2018.03.011

Abstract （394）

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From an information point of view, only the size of knowledge granularity is taken into account, while the importance of attributes cannot be objectively and comprehensively measured. First, starting from the perspective of algebra, the concept of approximate boundary accuracy is proposed. Afterwards, according to the definition of relative fuzzy entropy, this paper proposes two new concepts for relative information entropy and enhanced information entropy. Compared with relative fuzzy entropy, the proposed information entropy has an obvious magnification effect. Two new methods of attribute reduction are subsequently proposed by incorporating approximate boundary accuracy into relative information entropy and enhanced information entropy. Computing U/(B∪b) while making full use of U/B can greatly reduce the computational overhead on time. Finally, through the experimental analysis and comparison, it is validated that the proposed algorithm has feasibility and effectiveness in both reduction quality and classification accuracy.

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Design and implementation of an authorization system for a graduate school information

GU Hang, XIA Fan, SONG Shu-bin, XIAO Li-min, DONG Qi-wen, XU Lin-hao, ZHOU Ao-ying

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 109-120. DOI: 10.3969/j.issn.1000-5641.2018.03.012

Abstract （422）

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Authentication and authorization are critical to ensuring the security of data and services in software systems. To satisfy the need for authorization management during the development of the next generation information platform for East China Normal University's Graduate School, this paper proposes an access domain-based authorization module and uses Spring Security components to implement a hierarchical, configurable, high-performance privilege interceptor. The approach can effectively defend against popular network attacks, such as session attacks and CSRF, guarantee low latency for web service access, and provide a flexible way to meet the frequently changing authorization requirements of faculty from different schools and departments.

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An analysis of the hadron structure in covariant chiral effective theory

WEN Li-hong, YANG Ji-feng

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 121-128. DOI: 10.3969/j.issn.1000-5641.2018.03.013

Abstract （404）

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The matrix elements of twist-2 operators related to nucleon-parton distributions were calculated at one-loop level in the framework of covariant chiral perturbation theory. It was found that all who violate chiral power counting reside in the local terms depending on nucleon mass; hence, they could be readily removed through local counterterms, namely the contributions left over fulfill chiral power counting just like with HBChPT (Heavy Baryon Chiral Perturbation Theory). Meanwhile, one may arrive at incorrect behaviors near baryon thresholds due to the oversimplification of baryon propagators in HBChPT. The results here further support the proposition that the approach of covariant chiral perturbation theory with proper subtractions could both preserve the correct threshold behaviors and fulfill chiral power counting, and hence is a framework more suitable for investigating hadron physics.

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Influence of dipolar magnetic interaction on the LDGMI effect of Fe-based nanocrystalline ribbons

SU Ya-pan, PAN Hai-lin, ZHAO Zhen-jie, YUAN Meng-ping

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 129-135,156. DOI: 10.3969/j.issn.1000-5641.2018.03.014

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In this paper, the hysteresis loops, LDGMI (longitudinal driven giant magnetoimpedance) effect, and impedance phase variations of Fe_73.5Cu₁Nb₃Si_13.5B₉ nanocrystalline ribbons are investigated. The results show that the anisotropy field and the platform width of the LDGMI curves increase linearly with the number of nanocrystalline ribbons. This stems from the dipole-dipole interactions between the ribbons. Simultaneously, the "platform" width was modulated by the frequency and intensity of the driven field, the broad field amplified with the frequency of the driven field increasing, and gradually decreased with the intensity of driven field increasing. Hence, the work has important reference value for the development of LDGMI devices with multiple cores.

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Detecting spatiotemporal hotspots for vehicle thefts by multi-scale analysis

REN Zhe-hao, ZHANG Hao-tian, LIU Wei-hang, GUO Zhong-yang

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 136-145. DOI: 10.3969/j.issn.1000-5641.2018.03.015

Abstract （402）

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The detection of crime hot spots has become increasingly prominent in the conversion from reactive to active policing. There exist many crime analysis methods with good results. This paper focuses on scale effects in analysis. We proposed two multi-scale methods to detect temporal and spatial hotspots for vehicle thefts in a district, whose results were used for policing references. These two methods and their results are stated as follows:① a scaling method is proposed and combined with a rigid process to aggregate temporal data. Through this combination, temporal hotspots can be detected when data are not sufficient under mono-scale. Results showed that daily hot spots (30 days) and hourly hot spots (20 hours) of vehicle thefts are significant at the study site, on which the rearrangement of shift intervals can be based;② on the basis of daily hot spots, we set a median case density of a convex hull as the evaluation function when applying DBSCAN. The optimal scale, verified by the popular Prediction Accuracy Index, was adaptively chosen. We found that several metro line stations and residence zones need key protection.

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Validation of temperature and relative humidity profiles with satellite hyperspectral infrared sounder over East China

GU Ya-ru, LIU Yan-An, LIU Chao-shun, LI Zheng-long

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 146-156. DOI: 10.3969/j.issn.1000-5641.2018.03.016

Abstract （396）

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Satellite hyperspectral infrared data provide high temporal and spatial resolution information on atmospheric temperature and humidity profiles. They are important data source for numerical weather prediction models. Quality control of the data and correct characterization of observation errors are key to the successful application of assimilation. The radiosonde data is a direct measurement with high precision, which can be used to validate satellite retrievals. During the flood season of East China, high density radiosonde observations provide a valuable opportunity to examine the quality and quantify the error of Atmospheric Infrared Sounder (AIRS) retrieved products, both of which have a similar observation time at 14:00 Beijing time. This study focuses on East China during the summer of 2015. Results show that the AIRS retrieved temperature profiles are in good agreement with the radiosonde data, whilst the AIRS retrieved relative humidity profiles show the phenomenon of wetter in higher layers and drier in lower layers. The RMSE difference of temperature and relative humidity range from 1.02℃ to 2.49℃ and from 12.91% to 23.43%, respectively. Under the AIRS and AMSU (Advanced Microwave Sounding Unit) joint inversion products, the accuracy of retrieved temperature and humidity profiles are gradually degraded with the increasing number of total cloud fraction, but the results maintain a certain accuracy as a whole. This study provides a basis for the satellite data assimilation application under cloud cover.

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Study on spatial distribution of residential care facilities in Shanghai

CHEN Jie, YAO Shen-jun, WU Jian-ping, HUANG Le-le, REN Zhe-hao

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 157-169. DOI: 10.3969/j.issn.1000-5641.2018.03.017

Abstract （483）

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In order to provide decision support for the development planning of residential care facilities, this study investigates spatial distribution and location selection of residential care facilities based on data from care facilities and GIS spatial analytical tools. The results show that existing nursing services can generally meet demands, but there are significant regional differences. Residential care facilities in Shanghai are spatially clustered in the central urban area. Facilities in the city center are adjacent to residential areas and medical institutions; meanwhile, the location of residential care facilities in the suburbs are isolated, probably due to a lack of medical service. Therefore, this paper suggests that the government should provide elderly residents with more nursing support in the suburbs to ensure social equity.

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Influence of the diversion project and bathymetric change of Ruifeng Shoal on the flow diversion ratios in the South and North Passage of Yangtze River Estuary

DAO Fu-hai, LUAN Hua-long, YANG Wan-lun, DING Ping-xing, GE Jian-zhong

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 170-183. DOI: 10.3969/j.issn.1000-5641.2018.03.018

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This paper analyzes the bathymetric characteristics and the evolution processes affected by human activities in recent years at the bifurcation of the South and North Passage in the Yangtze River Estuary. A high-resolution FVCOM model is used to investigate the impact of the diversion project, the direction of submerged dike and the bathymetric change of Ruifeng Shoal on the ebb flow diversion ratios of the South and North Passage. The results show that the construction of the submerged dike at the bifurcation head has limited influence on the ebb flow diversion ratio of the North Passage. The ebb flow diversion ratio of the North Passage decreases when the submerged dike deflects northward and vice versa; however, the influence of the southward deflection is greater than that of the northward deflection. Scouring of the middle and lower Ruifeng Shoal and the northward shift of the mainstream are favorable for the flow entering the North Passage, which increases the flow diversion ratio of the North Passage in the upstream cross-section. Due to adjustment of the water flux in HengSha channel, the flow diversion ratio of the North Passage is slightly increased in downstream cross-section.

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Seicercus affinis and records of eleven other new birds in Shanghai

SHI Hong-liang, SHI Jian-yong, YUAN Xiao, BO Shun-qi

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 184-189. DOI: 10.3969/j.issn.1000-5641.2018.03.019

Abstract （525）

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We reported twelve new distribution records of bird species in Shanghai. Nine species, including Seicercus affinis, Abroscopus albogularis, Phylloscopus claudiae, Ficedula elisae, Muscicapa muttui, Turdus mupinensis, Oenanthe deserti, Larus glaucescens, Spilornis cheela, were first recorded in Shanghai. Another three species, Netta rufina, Dendrocitta formosae and Pycnonotus xanthorrhous, that were previously recorded but not listed in the Shanghai Bird List were observed again. All twelve species were considered new records for Shanghai. Thus, a total of 457 bird species, belonging to 20 orders and 70 families, have been now recorded in Shanghai.

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Additional information on Sphagnaceae species in Xinjiang

LIU Yan, Winira ILGHAR, Gulnigar AYSIRAHUN, Mamtimin SULAYMAN

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 190-195,211. DOI: 10.3969/j.issn.1000-5641.2018.03.020

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Based on extensive investigation and specimen identification of bryophytes in recent years, four new records of Sphagnaceae species have been reported for Xinjiang Province, namely Sphagnum angustifolium, S.cuspidatulum, S.cuspidatum and S.russowii. The major distinguishing morphological characteristics and geographic distribution of these species are discussed in this paper. The key to species of Sphagnaceae in Xinjiang has been provided. In addition, the geographic distribution of Sphagnaceae in Xinjiang was expanded to include Altai City, Qinghe County, Fuhai County and Habahe County, in addition to Hanas National Nature Reserve in Buerjin County, as previously reported. The results provide additional information on Sphagnaceae for bryoflora of Xinjiang.

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Progress in development of small molecule inhibitors targeting indoleamine 2,3-dioxygenase

CHEN Rui, FANG Yan-fen, ZHANG Xiong-wen

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 196-211. DOI: 10.3969/j.issn.1000-5641.2018.03.021

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In the development of cancer, cancer cells can employ a number of mechanisms to escape detection by the immune system. Indoleamine 2, 3-dioxygenase (IDO) is a type of enzyme in immune cells, which catalyzes the metabolism of tryptophan through the kynurenine pathway. Inflammation induced by cancer development can result in overexpression of IDO in protuberance cells and tumor cells in the tumor microenvironment,causing sustained consumption of tryptophan, inhibition of tryptophan-sensitive T cells functional activity, and a decrease in local immune activity in tumor tissues. Inhibition of IDO activity and its expression could effectively activate the immune system to kill tumor cells. Therefore, IDO has become a new target in cancer immunotherapy. Currently, four IDO inhibitors, namely Epacadostat, Indoximod, GDC-0919 and BMS-986205, are in the clinical research stage as potential new anti-cancer molecule immunotherapy drugs. At the same time, new IDO inhibitors such as PF-06840003 and RG70099 are also being investigated. In this article, the pogress of research on IDO and the development of IDO inhibitors as a new anti-cancer drug for tumor immunotherapy is reviewed.

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Preliminary study on temporal trend lag of organic pollutant concentrations in environmental media and its influencing factors

MO Jun-chao, HE Yuan, LIU Gang

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 212-221. DOI: 10.3969/j.issn.1000-5641.2018.03.022

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131 organic chemicals were used, and a level IV EQuilibrium Criterion (EQC) multimedia model was built. The model was applied to simulate temporal trends of organic chemical concentrations in environmental media using four emission scenarios. Results showed that temporal trends of organic chemical concentrations lagged behind their emissions in most cases, and organic chemicals with higher lgK_OW and persistence showed the most obvious lag effect. Correlation analysis showed that persistence was the principal factor influencing the lag time in water, air, and soil; and lgK_OW and persistence were the principal factors in sediment. Prediction formulas for lag time were obtained by regression analysis. If the sediment was a sink of organic chemicals, the lag effect would be distinct.The study can be employed to illustrate the theoretical transfer and transformation of organic chemicals in an environmental system.

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Spatio-temporal changes of ecological vulnerability in the Jiaozhou Bay Coastal Zone

PANG Li-hua, KONG Fan-long, XI Min, LI Yue

Journal of East China Normal University(Natural Sc 2018, 2018 (3): 222-233. DOI: 10.3969/j.issn.1000-5641.2018.03.023

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Using remote sensing data from 2000 and 2016 in the study area, the temporal and spatial variations of regional ecological vulnerability in the the Jiaozhou Bay Coastal Zone were studied based on landscape ecology and the characteristics of the ecological environment. Models of landscape vulnerabity and land ecological vulnerabity were established by characterizing the number of patches, patch density, reciprocal of fractal dimension, vegetation coverage index, and ecological suitability of land use. The results showed that in the past 16 years, the whole study area was predominantly level one and level two vulnerable areas, among which the proportion of vulnerability reduction was 17.52%. When the ecological vulnerability index of land use in 37.48% of sample areas increased, the land ecological vulnerability also increased. The ranking of overall average ecological vulnerability for all the use types was:other land > cultivated land > forest land > construction land > water area; the stability and anti-interference ability of other land, farmland, and forest land system were weak. The distribution of ecological vulnerabity of land was generally heavy in the Northeast and Southwest, gradually reduced by extension, and conversion between different levels of vulnerability showed significant differences and spatial heterogeneity. In Huangdao District, the area of level one and level three vulnerability changed greatly, while the proportion of level one or level two vulnerable areas decreased. The change of the level two vulnerable areas in Jiaozhou increased the most, and the level one and level two vulnerable areas became the most predominant. The Central district of the city had a lower level of change than other regions. The level five vulnerable areas in Chengyang district increased significantly compared with other regions. These results indicate that population, policy, and social and economic development were the key factors that lead to temporal and spatial variation in the ecological vulnerable areas.

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Existence of a travelling wave solution for a single population model with spatio-temporal delay

YANG Gao-xiang, ZHAO Lin-long

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 1-8. DOI: 10.3969/j.issn.1000-5641.2018.04.001

Abstract （334）

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In this paper, the existence of a travelling wave solution for a single population model with spatio-temporal delay is investigated by employing singular perturbation. The theoretical results are validated by using a numerical method. When the time delay is very small, a wave front solution exists; however, as the time delay increases, the shape of this travelling wave solution can vary and an oscillation wake can occur.

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Spatial Turing pattern of a predator-prey system with nonlinear harvesting effect

ZHANG Dao-xiang, SUN Guang-xun, HU Wei, KAI Ge

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 9-22,31. DOI: 10.3969/j.issn.1000-5641.2018.04.002

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We study the formation and selection of Turing patterns for a class of predator-prey systems with nonlinear harvesting effect. Firstly, the conditions of Turing instability induced by cross-diffusion terms are given by stability theory, and the existence region of Turing patterns of the system are obtained by bifurcation theory. Secondly, the amplitude equations of the system are derived using the multi-scales analysis method, and the selection results of Turing patterns are given. Finally, Matlab is used to simulate the pattern formation and selection results of the system. The results show that the system has rich Turing patterns, such as spot, stripe, and coexistence of the two types.

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Two optimal inequalities for Neuman-Sándor means

YANG Yue-ying, MA Ping

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 23-31. DOI: 10.3969/j.issn.1000-5641.2018.04.003

Abstract （380）

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This paper deals with the inequalities involving Neuman-Sándor means using methods of real analysis. The convex combinations of the second contra-harmonic mean D(a, b) and the harmonic root-square mean H(a, b) (or harmonic mean H(a,b)) for the Neuman-Sándor mean M(a, b) are discussed. We find the maximum values λ₁, λ₂ ∈ (0, 1) and the minimum values μ₁, μ₂ ∈ (0, 1) such that the two-sided inequalities
λ₁D(a, b) + (1-λ₁)H(a, b) < M(a, b) < μ₁D(a, b) + (1-μ₁)H(a, b),
λ₂D(a, b) + (1-λ₂)H(a,b) < M(a, b) < μ₂D(a, b) + (1-μ₂)H(a,b)
hold for all a, b > 0 with a≠b.

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The skew-Hermitian {P,k+1} Hamiltonian solutions of a linear matrix equation

YONG Jin-jun, CHEN Guo-liang, XU Wei-ru

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 32-46,58. DOI: 10.3969/j.issn.1000-5641.2018.04.004

Abstract （439）

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Given P ∈C^n×n and P^*=-P=P ^k+1, we consider the necessary and sufficient conditions such that the matrix equation AX=B is consistent with the skew-Hermitian {P, k + 1} (skew-) Hamiltonian structural constraint. Then, the corresponding expressions of the constraint solutions are also obtained. For any given matrix Ã ∈ C^n×n, we present the optimal approximate solution ā ∈ C^n×n such that ||Ã-ā|| is minimized in the Frobenius norm sense. If the matrix equation AX=B is not consistent, its least-squares skew-Hermitian {P, k + 1} (skew-) Hamiltonian solutions are given. Under the least-square sense, we consider the best approximate solutions to any given matrix. Finally, some illustrative experiments are also presented.

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Pricing of lookback options under a mixed fractional Brownian movement

CHEN Hai-zhen, ZHOU Sheng-wu, SUN Xiang-yan

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 47-58. DOI: 10.3969/j.issn.1000-5641.2018.04.005

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This paper studied the pricing of European lookback options when the underlying asset followed a mixed fractional Brownian movement and the transaction costs were considered. Firstly, the nonlinear partial differential equation and its boundary condition were obtained using the hedging principle under the model. Secondly, the partial differential equation was reduced using variable substitution. Next, we found its numerical solution by constructing a Crank-Nicolson format. Lastly, the convergence of the numerical scheme was discussed. We also discussed the influence of the transaction fee ratio, Hurst index, and so on.

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A strategy for real-time trajectory privacy protection

LIAO Chun-he, HUA Jia-xun, TIAN Xiu-xia, QIN Bo, JIN Che-qing

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 59-69,108. DOI: 10.3969/j.issn.1000-5641.2018.04.006

Abstract （449）

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Real-time trajectory privacy protection is a key research topic in the field of location-based services (LBS). Dummy trajectory technology is a popular privacy protection method which generates multiple fake trajectories similar to real ones. However, existing schemes take into account neither the real environment nor the relationship between adjacent positions carefully; with the help of this ancillary information, the real trajectory can be inferred easily. Hence we integrate entropy and constraints on location reachability into our proposed schemes, named dummy-based trajectory generating (DTG) and enhanced-DTG (EnDTG). Experimental results show that both schemes offer a higher privacy level than existing ones.

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An algorithm for natural language generation via text extracting

AI Li-si, TANG Wei-hong, FU Yun-bin, DONG Qi-min, ZHENG Jian-bing, GAO Ming

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 70-79. DOI: 10.3969/j.issn.1000-5641.2018.04.007

Abstract （456）

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The aim of natural language generation is to achieve a state where machines can generate text automatically. This would reduce the workload of human language workers and helps us deliver real-time, concise news coverage to readers. It could be applied to many applications, such as question and answers systems, automatic news writing, incident reporting, and so on. The challenge has been one of the open problems for both academia and industry. In this paper, we model the issue as a keyword covering problem and propose an unsupervised approach to extract text for natural language generation.The experimental results illustrate that the algorithm is effective for large-scale corpus; the text coverage is more comprehensive and the generated text is closer to the manual text produced by an individual.

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Incorporating Bayesian inference with random walk for friend recommendations

YANG Qing, WANG Hai-yang, BIAN Meng-yang, ZHANG Jing-wei, LIN Yu-ming, ZHANG Hui-bing, ZHANG Hai-tao

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 80-89. DOI: 10.3969/j.issn.1000-5641.2018.04.008

Abstract （407）

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Random walk is an effective strategy for dealing with a large user base as well as data sparsity in recommendation problems. However, the current work on recommendation problems do not take full account of the impact implied by both the intimacy difference between users and the reverse social influence. This paper presents an optimized friend recommendation model based on random walk, which introduces frequent pattern mining to capture user intimacy and to optimize the transition probability matrix,and is combined with local reverse search to implement recommendations. In order to make full use of users' attribute information, a Bayesian inference model is proposed for analyzing users' potential friend relationships and combined with random walk to provide better recommendation services. Experiments on real datasets demonstrated the effectiveness of the proposed method.

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Sublink elimination and optimization in data storage and processing separation architecture

WANG Yan-zhao, HU Hui-qi, ZHANG Zhao, LIU Xiao-bing, DUAN Hui-chao

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 90-98. DOI: 10.3969/j.issn.1000-5641.2018.04.009

Abstract （337）

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This paper implemented a sublink elimination optimizer in NewSQL RDBMS (Relational Database Management System). The purpose of the optimizer is to make complex SQL so that it can be executable in New SQL systems, and achieve auto-tuning of complex SQL to reduce the cost of migrating from a centralized database to a distributed database; this would make the NewSQL DBMS (Database Management System) available to telecomunications and banking industries. We also provide a method to minimize data transmission between servers after sublink promotion. Experiments show that the optimization effect of the query optimizer is notable and can replace manual optimization and reduce the workload of application migration.

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Data calculation and performance optimization of dairy traceability based on Hadoop/Hive

ZHU Shu-xin, LI Yue, YUAN Pei-sen, XU Huan-liang, WANG Kang, XIE Zhong-hong

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 99-108. DOI: 10.3969/j.issn.1000-5641.2018.04.010

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In order to enhance the performance of traditional dairy traceability systems for the production data of large-scale enterprise, this paper analyzed the supply chain process of dairy enterprises, key traceability units and traceability information; combining Hadoop/Hive big data technology and distributed database technology, the paper designed and constructed a dairy products traceability framework based on Hadoop/Hive. We built a simulated large-scale data environment and used actual production data to test the system performance. The experimental results showed that after the introduction of the Hadoop/Hive technology system, the average data storage speed, the average data access speed, and the average data exchange rate increased by 87.43%, 27.10% and 58.16%, respectively. The improved traceability system for dairy products is superior to the traditional dairy traceability system in storing and processing large-scale data.

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High performance computing in quantum chemistry

WANG Tao

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 109-119. DOI: 10.3969/j.issn.1000-5641.2018.04.011

Abstract （384）

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High performance computing is widely used for chemical simulations. This paper reviews the current state of parallel computation methods in quantum chemistry; discusses the features, software technology and parallel implements of various quantum chemistry methods; and considers the prospects for the future.

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Collaborative filtering recommendation algorithm based on the self-similarity matrix

ZHANG Wei, ZHENG Jun, PANG Jiao-na, BAI Yue

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 120-128,146. DOI: 10.3969/j.issn.1000-5641.2018.04.012

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A collaborative filtering recommendation algorithm based on self-similar matrices is put forward for the noise problem in the proposed system. In this paper, self-similar matrices are selected as primitive matrices, and the sliding window is chosen as the row vector and column vector of the score. The new score matrix is obtained to preprocess the original scoring matrix to establish the linear relationship between the scoring value and the self-similar matrices. The new scoring matrix preserves the original matrix of scoring information, while weakening the impact of noise data on the recommended system. Experiments show that the pre-processing of the original matrix effectively alleviates the impact of noise in the scoring matrix and improves the performance of the proposed system.

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A study of approximate analytical solutions of a kind of typical second-order nonlinear different equation

LOU Zhi-mei, WANG Yuan-bin, WANG Peng

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 129-137. DOI: 10.3969/j.issn.1000-5641.2018.04.013

Abstract （474）

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In a non-inertial rotational reference frame, the motion of a system can be governed by a kind of second-order nonlinear differential equation, in which the numerator and denominator both contain nonlinear terms; in this context, it is hard to obtain an approximate solution for this strongly nonlinear equation. In this paper, we study the approximate solution of the second-order nonlinear differential equation by the Adomian decomposition method. Comparisons between the approximate solution and the numerical solution by using two other methods are also made. The results show that, in the first quarter period, the approximate solutions obtained by the Adomian decomposition method is in good agreement with the numerical solutions and the error of the approximate solutions are smaller than the other solutions obtained by the homotopy asymptotic method.

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Study and investigation of Lejeuneaceae species diversity in Anhui Province

SHI Xue-qin, TANG Xia, WEI Yu-mei, WANG Jian

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 138-146. DOI: 10.3969/j.issn.1000-5641.2018.04.014

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This paper studies the diversity of Lejeuneaceae species in Anhui Province based on field data collections and literature review. Our study reveals the occurrence of 46 species in 11 genera of Lejeuneaceae in Anhui Province, including one newly recorded genus (Myriocoleopsis Schiffn.) and 10 newly recorded species. The genus with the largest number of species is Lejeunea (12 spp.) and the second largest genus is Cololejeunea (10 spp.). Floristic analysis shows that tropical elements are the most prevalent among Anhui Lejeuneaceae flora with 27 species, accounting for approximately 58.7% of the Lejeuneaceae species in Anhui Province. East Asian elements, the second most prevalent group, with 13 species accounts for approximately 28.3% of the total number of species. The optimal habitat conditions for most Lejeuneaceae are low mountainous and ravine areas below 400 m as well as alpine areas above 1 600 m. Four epiphyllous liverwort species are newly reported from Guniujiang Nature Reserve in Shitai County. The distribution of epiphyllous liverworts in Eastern China therefore extends north of latitude 30°N. We also analyzed the status of epiphyllous liverworts in this area.

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A study on spatial-temporal differences and factor decomposition of the ecological footprint of Zhejiang Province

LI Guo-zhi

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 147-158. DOI: 10.3969/j.issn.1000-5641.2018.04.015

Abstract （340）

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Using an ecological footprint model, this paper calculated the ecological footprint and ecological carrying capacity of Zhejiang Province, and further decomposed the ecological footprint using an IPAT model. The results showed that the ecological footprint increased from 7.852×10⁷ ghm² to 1.5484×10⁸ ghm² from 2002 to 2015, and that the ecological pressure was significant. At the same time, the ecological efficiency improved rapidly, and the capacity for economic sustainable development improved. The ecological footprint and ecological carrying capacity varied greatly in different regions. Lishui City was the only region with ecological surplus; the ecological efficiency was 1.04×10⁴ yuan/ghm² in 2015, the highest among all the regions in Zhejiang Province. The results of factor decomposition showed that economic growth was the inhibiting factor for the ecological footprint, and it reduced the ecological footprint to 8.164×10⁷ ghm² across the whole province. The level of economic development and population size were driving factors, and they increased the ecological footprint by 1.2987×10⁸ ghm² and 2.810×10⁷ ghm², respectively, across the whole province.

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Dynamic characteristics and influencing mechanisms of suspended sediment discharge at the outlet of Dongting Lake

YU Ya-wen, DAI Zhi-jun, MEI Xue-fei, WANG Jie, WEI Wen

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 159-170. DOI: 10.3969/j.issn.1000-5641.2018.04.016

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Dongting Lake's storage capacity is of vital significance to the Changjiang River. The changes in suspended sediment discharge (SSD) from Dongting Lake to the Changjiang River are closely linked to both the lake's evolution and the lake-river relationship. Based on long-term hydrologic data from 1951-2015, the dynamic characteristics of SSD at theDongting Lake outlet and associated controlling factors were analyzed by using percentile, coefficient of variation, and wavelet analysis. The results showed that the SSD time series (1951-2015) could be divided into three sub-periods, namely 1951-1970,1971-2002, and 2003-2015. Specifically, SSD of the first two periods exhibited decreasing trends, while SSD during the 2003-2015 period displayed on upward tendency. Apparent seasonal fluctuations were observed in SSD with a majority of sediment transported in March-December and in March-August during 1951-1970 and 1971-2015, respectively. However, the peak monthly SSD shifted from April in 1951-2002 to May in 2003-2015. Moreover, periodic 44-year and 24-year oscillations were detected across the entire SSD data set. The variation in SSD at the outlet of Dongting Lake can be explained by runoff, water conservancy projects, and the lake's erosion-deposition pattern. It was found that runoff at the outlet of Dongting Lake was the important factor induced the seasonal fluctuation and primary periodic oscillation of SSD. The Jingjiang Cut-off Project is likely responsible for the significant SSD decrease during the period 1971-2002. Annual average SSD over the period 2003-2015 decreased by 30.1% in comparison with 1971-2002 following opening of the Three Gorges Dam. In addition, the SSD series showed an increasing trend after 2007 as the Dongting Lake basin shifted from a deposition state into an erosion state.

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Water mass transport and its controlling mechanisms between the Changjiang Estuary and Subei Coastal Water during the summer

ZHU Ping, WU Hui

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 171-183. DOI: 10.3969/j.issn.1000-5641.2018.04.017

Abstract （413）

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The objective of this study was to investigate summertime water movement and its response to wind and tidal forces between the Changjiang Estuary and the Subei coastal area based on a high-resolution, three-dimensional numerical model. The volumetric flux and the freshwater transport from the Changjiang River and the Subei local rivers were quantified across a number of cross-shelf sections. The results indicated that, under the studied climatologic conditions, the net transport in the Subei Coastal Water is generally northward. The velocity of this northward transport reaches 10 cm/s in the shallow area. Offshore transport occurs in the vicinity of the Sheyang Estuary, with a net transport velocity of circa 7 cm/s along the 40 m isobaths. The sectional water flux is related to the tidal range, which reaches a low point in neap tide and a high point in spring tide, respectively. The tide has great impact on water movement in this area. Without the tide, the net water transport is entirely northward north of the Changjiang River Estuary and the southeastward transport along the 40 m isobaths vanishes. On the other hand, the monsoon has no significant influence on the water movement; it only adjusts the water transport in a few local areas.

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Characteristics of sea surface temperature in the Changjiang Estuary and adjacent waters based on a Self-Organizing Map

BAI Mei, WU Hui

Journal of East China Normal University(Natural Sc 2018, 2018 (4): 184-194. DOI: 10.3969/j.issn.1000-5641.2018.04.018

Abstract （386）

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Sea surface temperature (SST) in the Changjiang Estuary and adjacent waters is affected by multiple dynamic processes, which show complex spatiotemporal variability. In this study, the SST variability was investigated by analyzing modeled results with a Self-Organizing Map (SOM) method. The SST variations were clustered on seasonal, spring-neap, and intra-tidal timescales. It was found that the SST pattern remains stable during the winter and summer seasons but highly variable during the spring and autumn seasons. A cold water band is present south of the Changjiang River mouth in the winter season, due to the southward along-shore extension of the Changjiang River plume. A cold water patch occurs near the Zhoushan Islands, caused by upwelling in the Zhejiang coastal water. In the Subei coastal water, the cold water patch and tongues were most significant during the winter and spring seasons.

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Journal of East China Normal University(Natural Sc 2018, 2018 (5): 1-2.

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