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    J* E* C* N* U* N* S* 2004 Vol.2004
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    Adaptive- Control for Linear Stochastic Systems with Unknown Orders and Coefficients
    YANG Chang-li;RUAN Rong-yao;GONG Miao-kung
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 1-14.  
    Abstract3177)            Save
    This paper considers single-input single-output linear discrete-time stochastic feed-back control systems(ARMAX model) with unknown orders and coefficients, and propose a new adaptive control algorithm, which is easily implemented on-line. The algorithm can guarantee the global stability of the resulting closed-loop system and the asymptotic optimality of the adaptive tracking. And the estimates of the orders and coefficients are all strongly consistent in the closed-loop identification. Simultaneously, the convergent rate of coefficient estimates to their true values is also given. The simulation results given in this paper show that the new algorithm of the adaptive control we developed here are effective and feasible, besides the control quantities are in the range of the admissible control.
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    Exact Travelling Wave Solutions for R-L-W Equation
    NIE Xiao-bing;WANG Li-reng
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 15-21.  
    Abstract3195)            Save
    Stimulated by extended tanh-function method, a double functions method is proposed for constructing exact travelling wave solutions for nonlinear evolution equations. By means of the method, sixteen kinds of exact travelling wave solutions for R-L-W equation are obtained, which contain soliton wave solutions and periodic solutions. The results obtained by Zheng Bin and Zhang Hongqing are extended. With the aid of Mathematica, the method can be carried out partly by computer.
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    On Weighted Least-squares Skew-Hermite Solution of Matrix Equation AXB=E
    WANG Ming-hui;WEI Mu-sheng
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 22-28.  
    Abstract3262)            Save
    Using CCD of a matrix pair, this paper obtains the expression of the weighted least-squares Skew-Hermite solution with minimum norm of matrix equation AXB二E and the necessary and sufficient conditions for the existence of its Skew-Hermite solution. Also, in the solution set of matrix equation, the
    expression of the optimal approximation solution to given matriix is derived.
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    Parallel Genetic Algorithm for Nonlinear Equations
    LIU Can-wen;LIU Jie
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 29-34.  
    Abstract3222)            Save
    In this paper the problem on numerical solution of nonliner equations is transformed into that of optimization with linear constraints,and then that solution is found through the genetic algorithm. we also revise genetic algorithm into self-adaptive parallel genetic algorithm to prevent premature convergence. Numerical simulation experiments show our algorithm offers an effective way to solve the nonlinear equations from another viewpoint.
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    Asymptotic Normality of Anti-symmetric K-U Statistic
    ZHANG Ri-quan;WANG Jing-long
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 35-39.  
    Abstract2739)            Save
    In this paper, Un= is called the anti-symmetric K-U statistic, where h(x,y)=- h(y,x) is an anti-symmetric function. When k is a constant and k=O(ns) where
    0<s<1/2,the asymptotic normality of the anti-symmetric K-U statistic will be established respectively.
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    Comparison of MINQUE and Simple Estimator of Covariance Matrix
    Abdul-Hussein Saber AL MODEL
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 40-44.  
    Abstract3169)            Save
    This paper considers comparison of MINQUE and simple estimator of ∑ in the multivariate normal linear model Y~N(XB,∑⊙V) under the risk of squared loss function criterion, where the design matrix X need not have full rank and the dispersion matrix V can be singular. A necessary and sufficient condition is obtained.
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    Longitudinally Driven Magneto-impedance Effect on Glass-covered Fe-based Nanocrystalline Microwires
    LIU Long-ping;ZHAO Zhen-jie;RUAN Jian-zhong;WANG Rui-li;YANG Xie-long
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 45-48.  
    Abstract3254)            Save
    Amorphous Fe73.0Cu1.0Nb1.5V2.0Si13.5B9.0 microwires were prepared by glass-coated melt-spinning technique. Nanocrystalline samples were obtained by annealing the amorphous wires at appropriate temperatures and the longitudinally driven giant magneto-impedance effect has also been investigated for the first time. The result showed that the maximal magneto- impedance value was 1020% obtained in the sample annealed at 5700℃.
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    The Study of MEMS Millimeter Wave Phase Shifter
    GUO Fang-min;ZHU Shou-zheng;WEI Hua-zheng;ZHENG Ying;ZHU Rong-jing;XIN Pei-sheng;ZHU Zi-qiang;LAI Zong-sheng;YANG Gen-qing;LU Wei
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 49-55.  
    Abstract3165)            Save
    Several designs of MEMS millimeter-wave phase shifters are presented in this paper. They consist of a coplanar wave-guide (CPW) transmission line periodically loaded with 8-32 metal bridges, functioning as capacitive switches. Every switching element consists of a thin metallic membrane actuated by applied bias. Remarkable phase shifter performances were observed. 21Al0.96Si0.04 bridges MEMS Phase shifter reached to 372(/3. 5mm under 20V bias at 35 GHz, the with an insertion lose (S21) of about 4-7 dB.
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    Fe/ PZFE Nanometer Composites by High Energy Ball Milling
    QIAN Fang-zhen;JIANG Ke-yu;RUAN Jian-zhong
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 56-60.  
    Abstract10714)            Save
    Fe/PTFE nanometer compound was prepared by high energy ball milling. Firstly, PTFE was milled for 50h,90h,120h ,then Fe/ PTFE mixture was milled for 700h. The components were indentified by 57Fe Mossbauer spectroscopy. The Mossbauer effect studies show that the spectrum includes not only both
    sextets of bulk and interface of a-Fe ,it indicates the size of particle Fe is in the order of nanometer, but also one singlet for Fe3+, one doublet for Fe2+ , they corresponds to FeF2 and FeF3 respectively. As milling time increases,the component of interface of a-Fe disappears, meantime, the Fe3C appears. The result shows that it is helpful to produce FeF3 as PTFE was initially milled.
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    Studies on Standardization of GIS in Shanghai
    WANG Feng-xia;ZHANG Chao
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 61-66.  
    Abstract3101)            Save
    With the flourish development of GIS, more emphases are placed on standardization of GIS. On the basis of discussing the concept of standardization of GIS, the article analyses the study status of standardization of GIS at home and overseas. At last, some proposals of standardization of GIS in Shanghai are put forward.
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    Abstraction the Environmental Physical Field Values of Influencing MCSs Movement
    GUO Zhong-yang;DAI Xiao-yon;LIN Hui;JIANG Ji-xi;HANG Qian
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 67-72.  
    Abstract2971)            Save
    The evidences have indicated that rainstorms are usually related with the movement of MCSs, however, the factors of influencing MCSs movement are very complex. In this paper, GMS infrared blackbody temperature over the Tibetan Plateau from June to August 1998 are used to automatically track the
    movement routes of MCSs. Based on these, spatial data mining method, decision tree, is used to develop the relationships between the movement routes of MCSs and their environmental physical field values, the results indicate that it is feasible to forecast the movement routes of MCSs using decision tree.
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    Effects of Chinese Cobra Cardiotoxin on Pain and Memory
    LIU Hua-qing;LI Rong-xiu;XIAO Qi-shi;LIU Hao-ran;WENG En-qi;WANG Ting
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 73-78.  
    Abstract3142)            Save
    To study the analgesic effect and ameliorating effect of cobra cardiotoxin (CTX) on learning and memory impairment induced by scopolamine in mice. The toxicity of CTX was measured in acute toxicity test. The analgesic effect of CTX in mice was measured by hot plate method and acetic aicd writhing test.
    The ameliorating effect of CTX on learning and memory impairment induced by scopolamine in mice was studied by Y-Maze, Shuttle-box, Step-down and Water Maze methods respectively. LD50 value of CTX was 2.17 mg/kg. CTX ip 0.03 mg/kg, 0. O6mg/kg significantly prolonged the latency time of mice to hot plate stimuli, attenuated the writhing times induced by acetic aicd. CTX ip 0.06 mg/kg, 0.12mg/kg significantly reduced the errors of the mice in Y-Maze test, decreased the mices training times, shorten the escape latency in Shuttle box test. In Step-down test, CTX ip 0.06mg/kg, 0.12mg/kg increased the escape latency and reduced the number of errors, CTX also reduced the searching platform latency and swim path-length in Morris water maze test with mice. All of the effects are dose-dependent. The results above suggested that CTX has an effect of analgesia and is able to improve the learning and memory impairment induced by scopolarnine in mice.
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    Studies on the Morphology and Morphogenesis in Diophrys oligothrix
    YAO Jun-jie;PANG Yan-bin
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 79-87.  
    Abstract2879)            Save
    The morphology, morphogenesis of Diophrys oligothrix during the asexual division were studied in detail. Studying on the development of adoral zone of membranelles(AZM) and comparing the AZM of daughters with its parental AZM, we conclude that the AZM of the proter is reorganized. Comparing the
    morphogenesis of macronuclei and the nuclear apparatus among D. oligothrix, Euplotes and Aspidisca, we can find evolutionary relation among them. After binary division, both the proter and the opisthe of D. oligothrix still recover their ciliary pattern.
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    Analysis on the Contents of Protein and Amino Acids in Cherax quadricarinatus during Different Embryonic Development Stages
    LUO Wen;ZHOU Zhong-fang;ZHAO Yun-long;YANG Zhi-biao;ZHANG Ming-feng
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 88-92.  
    Abstract3791)            Save
    The compositions of protein and amino acids were measured and analyzed during the embryonic development of Cherax quadricarinatus. The results indicated that the contents of total protein and total amino acids were all downtrend. The total amino acid contents reduced from 58.05 % (dry weight) at the fertilized egg stage to 47.49% at the prepare-hatching stage. The correlation between the total amino acid and the essential amino acid(except methionine) was prominent, the coefficients of variation were from 8. 25 0o to
    13. 34N. In the non-essential amino acid,the contents of glutamine acid and aspartic acid were relatively higher, but the content of cysteine was relatively lower. The results above indicated that protein and amino acid were not only the construction substances of embryonic development, but also the dominating energy sources.
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    Study on the Toxicity of Sediment and Water of Suzhou Creek
    LIU Yun;HONG Rong;ZHU Wen-jie;TANG Guo-yin;WENG En-qi
    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 93-98.  
    Abstract3722)            Save
    The toxicity of sediment and water of Suzhou Creek was investigated by toxicological methods including acute and sub-acute toxicity test performed on luminescent bacteria, fishes, mice and rats. In luminescent bacteria toxicity test, for the reaches of Zhaotun, Huangdu, Huacao, Beixinjing, Panwanli,
    Changshou Lu Bridge, Wuning Lu Bridge and Zhejiang Lu Bridge, exposure to the water and the lixivium of sediment inhibited the luminescence, which suggests these samples have toxicity effect on the photobacteria. Furthermore, the toxicity effect is more obvious in urban reaches than in suburb ones, in summer than in winter, in the sediment than in the water. In field test, for the reaches of Changshou Lu Bridge and Zhejiang Lu Bridge, after exposure for 96 hours the livability rate of crucian respectively decreased to 0% and 30%;but for Huangdu reach the livability rates crucian was 83 %. The results suggest urban reaches are evidently unsuitable for cruciads survival. The results of the test on mice suggest the sedimant of Beixinjing
    reach has acute toxicity to mice. According to the results of sub-acute test on rats the sediment and the water of Beixinjing reach could be harmful to animars liver. On the basis of the above results we draw the conclusion that Suzhou Creek especially its reaches in urban area is unfavorable for biological survival.
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    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 99-102.  
    Abstract2401)            Save
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    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 103-105.  
    Abstract2392)            Save
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    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 106-108.  
    Abstract2466)            Save
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    Journal of East China Normal University(Natural Sc    2004, 2004 (1): 109-111.  
    Abstract2274)            Save
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    The Order of A Root of xp-x-1 over Fp
    SHI Jian-yi;WANG Zhen-hua
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 1-4,23.  
    Abstract2562)            Save
    The present paper is concerned with the order o(αp) of a root αp of the polynomial xp-x-1 over a prime field Fp. We propose a conjecture that o(αp)=mp:=(pp-1)/(p-1) for any prime p. Then we introduce two methods to verify the conjecture in certain cases.
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    C*-Algebras of Tracial Real Rank Zero
    YAO Hong-liang;;HU Shan-wen
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 5-12.  
    Abstract2876)            Save
    In this paper, we introduce a class of C*-algebras which have tracially real rank zero. We show that if A is a unital C*-algebra with tracial real rank zero and B is a AF-algebra, then A×B has tracial real rank zero. If a unital simple C*-algebra has tracially real rank zero, then it has real rank zero.
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    The Modifications of Trees and the Laplacian Spectrum
    YUAN Xi-ying;;WU Bao-feng;;XIAO En-li
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 13-18.  
    Abstract2902)            Save
    In the first two parts of this paper, we investigate two kinds of modifications and their relations with the Laplacian spectrum of trees, then give an order of trees which have smaller Laplacian spectra radius.
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    The Energy Growth Property for p-Harmonic Maps
    LIU Jian-cheng;LIAO Cai-sheng
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 19-23.  
    Abstract2632)            Save
    In this paper, we study the p-energy growth property for a large class of p-harmonic maps. Using Hessian comparison theorem in Riemannian geometry, we obtain the special estimation of p-energy growth.
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    An Optimal Poincaré Inequality
    LIU Yong-ming;LI Na
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 24-30.  
    Abstract3387)            Save
    Poincaré integral inequality plays an inportant role in the nonlinear stability theorem of Arnold. In this paper, a best possible Poincaré integral inequality is obtained, which can be used to get a better estimation of disturbance bound for two-dimensional quasi-geostrophic flow and a better nonlinear stability criterion as well.
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    Comparison of MINQUE and Simple Estimators under Entropy and Symmetry Loss Functions
    Abdul-Hussein Saber AL-MOUEL
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 31-36,5.  
    Abstract3259)            Save
    This paper considers comparison of MINQUE and simple estimator of Σ in the multivariate normal linear model Y~N(XB, Σ×V) under the risk of entropy loss function and symmetry loss function criterion, where the design matrix X need not have full rank and the dispersion matrix V can be singular. It is interested to prove that MINQUE is superior to simple estimator under Entropy loss function.
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    The Growth Optimal Portfolio in a General Market Driven by Jump-diffusion Processes
    XU Zhi-yan
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 37-42.  
    Abstract6370)            Save
    In this paper, We generalize the results of Yan et al[1] results on the growth optimal portfolio in a market driven by jump-diffusion processes with multi-risky assets. Sufficient conditions for existence of growth optimal portfolio in this case were given.
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    Analysis and Realization of Bluetooth SDP and Its Improvement
    XIONG Jiang;GU Jun-zhong;XUE Mei
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 43-50.  
    Abstract3852)            Save
    Wireless Network which is based on two protocols: IEEE802.11b and Bluetooth solves the problems of wire communication moving inconvenience, lacking in flexibility and use inconvenience. This paper analyzes and researches system architecture, service search engine and realization of SDP which is working in the embedded mobile environment, and suggests some improvement ideas on its shortage which is concluded from the comparison to IEEE802.11b to enhance its security and transfer speed.
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    Research on Application Model and Key Technology of Pervasive Computing
    JIANG Guo-hua;GU Jun-zhong
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 51-57.  
    Abstract2580)            Save
    With the development of computer science and communication technologies, Computing patterns are changing. This thesis studies pervasive computing environment and traditional application models. On the research basis, we put forward an appropriate application model according to the characteristics in this new environment. Then we research the key element of the model -service gateway. At last, we adopt this model in the iHome project raised by SVA-IBM joint Lab. It proved its practicability. The proposition of pervasive application model is in the person ’of humanity. It provides a solution to the problems in pervasive computing and is a guide to the continued development of pervasive applications.
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    Bragg Frequency Study of RF Distributed MEMS Phase Shifter
    QING Jian;SHI Yan-ling;LI Wei;ZHU Zi-qiang;LAI Zong-sheng
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 58-63.  
    Abstract2842)            Save
    The Bragg frequency, which describes the upper limit frequency of distributed phase shifters, is a very important parameter of RF distributed MEMS phase shifters. This paper discusses in detail the underlying cause and analysis method of Bragg frequency. In addition, by using microwave network theory, the Bragg frequencies of MEMS phase shifters with different dimensions have been calculated. The simulated results demonstrate the Bragg frequency is decreased by increase of the dimension and spacing. The studied phase shifters consist of a CPW line (50 Ω) periodically with MEMS bridges at a spacing of 300 μm. When the widths of the center conductor are chosen to be 50 μm and 100μm, the Bragg frequency are 38.1 GHz and 27.6 GHz, respectively. As the width of the center conductor is fixed at 100 μm, the Bragg frequency reduces form 27.6 GHz to 19.6 GHz with the spacing increasing form 300 μm to 567 μm. Researching the Bragg frequency will benefit the design and optimization of the distributed MEMS phase shifters.
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    Magneto-impedance Effect in BeCu/NiFeB Electroless-deposited Wire
    WANG Xin-zheng;YUAN Wang-zhi;M Oumarou;RUAN Jian-zhong;GONG Feng-fei;ZHAO Zhen-jie;YANG Xie-long
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 64-68.  
    Abstract2884)            Save
    NiFeB films were electroless-deposited on 100 μm BeCu wires and were annealed at different temperatures in N2 atmosphere. The dependence of GMI on the annealing temperature and frequencies of driving current was studied. The maximum GMI ratio of 33% of these sample was observed by annealing at 200 ℃. After adding the insulator layer between BeCu and NiFeB layer the GMI ratio of the sample increases to 83%.
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    Study on the Synthesis of 5-FAsA-DBF and Its Chromogenic Reaction with Thorium
    XU Feng;HAO Zheng-wen;GAO Mei-rong;WU Bing-cai
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 69-71,8.  
    Abstract2785)            Save
    A new chromogenic reagent 5-FAsA -DBF was synthesized and its colour reaction with thorium was studied, In a perchloric acid medium of 3.84 mol&#8226;L-1, 5-FAsA-DBF reacted with thorium to form a stable coordinate-complex, having its absorption maxima at 630 nm.Its molar absorptivity was found to be 1.63×105 L&#8226;mol-1&#8226;cm-1 .Beer’s law holds in the concentration range of 0~40 μg of Th(Ⅳ) per 25 mL of solution.The method has been apllied to determinate thorium in seafood with satisfactory results.
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    The Basic Character on Process of Runoff and Sediment Discharge at Datong Station of the Changjiang River Ⅰ. Analysis on Runoff Process
    WANG Pan-cheng;HE Song-lin
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 72-80.  
    Abstract3367)            Save
    The Changjiang estuary is a typical estuary that fluvial factors plays a dominant role in fluvio-marine interaction. The process and its variation of runoff and sediment discharge have situation under control in respect of evolution of the estuarine environment. This paper studies main characters of runoff process at Datong Station with methods of time-series analysis. It is stated that the runoff series at Datong Station has little change trend since 1923, but a jumped decrease near 1955 and a jumped increase near 1988 have emerged. Meanwhile, it has a certain appearance of periodic variation with around 16,7 years. The distribution patterns of monthly flow, the matching state of high or low water between flood and dry season as well as the relevant causes are also discussed in the paper.
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    The Basic Character on Process of Runoff and Sediment Discharge at Datong Station of the Changjiang River Ⅱ. Analysis on sediment transport process
    HE Song-lin;WANG Pan-cheng
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 81-86,1.  
    Abstract3205)            Save

    The Changjiang river is rich in sediment supply which exerts an important influence on development of the Changjiang delta, evolution of shoals and channels in the estuary, realignment and utilization of the estuary. Trend analysis and period analysis on the sediment transport series at Datong Station state that an obvious decrease trend has emerged in the annual series of sediment transport at Datong Station although the sediment discharge at Yichang Station and the annual runoff series at Datong Station have little change trend. The situation is mainly related to shoaling of Dongting Lake, Poyang Lake and other lakes. The sediment-producing region is mostly located in the upper reach and sediment-producing effect of upper, middle and lower reaches is obviously different, so that sediment transporting situation is responded with runoff discharge only about 30% of years in the series. As for monthly distribution of sediment discharge, some 87.7% of suspension loads are discharged through the Datong section from May to Octorber. In addition, the matching status of sediment discharge between flood and dry seasons is preliminarily analyzed in the paper.

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    Observation and Modeling Analysis of Dynamic Mechanism of the Upwelling at Lusi
    ZHU Jian-rong;QI Ding-man;WU Hui
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 87-91,1.  
    Abstract2931)            Save

    Based on the analysis of the observation we organized in August of 2000 off the Changjiag mouth,we found for the first time that there exists upwelling phenomenon at Lusi fish ground.The upwelling can bring the colder water and nutrient from the lower layer to the upper layer,and has an important effect on the environment and ecosystem.In order to understand the dynamic mechanism of the upwelling phenomenon,we used a three-dimension high resolution turbulent closure circulation model in spherical coordinates based on the modified ECOM_si model to study this upwelling.The calculated domain includes the East China Sea,Yellow Sea and Bohai Sea,and the real coastline and water depth were considered.In the case of considering all dynamic factors (water volume flux at the open boundaries,density gradient forcing and wind stress),the numerical model reconstructed successfully the upwelling phenomenon which is fairly consistent with the observations.The numerical experiments show that the dynamic mechanism of the upwelling is mainly produced by the baroclinic effect that is induced by the mixing between fresh water from the Changjiang River and the saline water.The wind stress has a little effect on it,and the water volume flux at open boundaries has no effect on it.The combination force of the slop of bottom with the baroclinic effect and wind stress makes the upwelling stronger.

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    Effects of Procyanidins on Preventing Mitochondria Damage in Rat Liver Induced by &#8226;OH
    CHEN Ji-wu;ZHU Zhen-qin;SU Yu;WANG Ni;CAO Jia-qi;LIU Guo-wei;HU Bing;ZHAI Wan-yin
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 92-96.  
    Abstract3327)            Save
    Oxidative damage of the mitochondria plays an important role in generating and developing process of many diseases.Hydroxyl radical (&#8226;OH) has been considered an important factor inducing mitochondria damage.Therefore,it has important significance to study and exploit medicines protecting mitochondria damage caused by &#8226;OH.We measured effects of procyanidins preventing mitochondria damage induced by&#8226;OH using spectrophotometry and fluorescent polarimetry.The results showed that procyanidins increased effectively membrane lipids fluidity of damaged mitochondria,decreased significantly the mitochondria swelling and lipid peroxidation product formation.As a result,procyanidins can maintain the integrity of structure and function of mitochondria.Above results can provide new data for further exploitation of procyanidins.
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    The Definition and Types of Urban Ecological Sensitive Area with the Case Study in Pudong New Area,Shanghai,China
    DA Liang-jun;LI Li-na;LI Wan-lian;CHEN Ming
    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 97-103.  
    Abstract3561)            Save
    This paper discusses different points of view about the concept of ecological sensitive area and proposes that the green field should be included in the conception of urban sensitive areas to prevent the irregular expand of urban.Based on this conception,the ecological sensitive areas are classified into five types namely ①nature-protection type,②environment-improvement type,③field-control type,④pollution-effect type and ⑤resource-reserve type.As a case study,the types of eological sensitive area in Pudong New Area were classified and the suggestions on the consrtuction of ecological sensitive area were put forward.
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    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 104-106.  
    Abstract2320)            Save
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    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 107-109.  
    Abstract2378)            Save
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    Journal of East China Normal University(Natural Sc    2004, 2004 (2): 110-112.  
    Abstract2184)            Save
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    Existence and Uniqueness of Limit Cycle for A Nonlinear Equation
    LIU Xing-bo
    Journal of East China Normal University(Natural Sc    2004, 2004 (3): 1-5,28.  
    Abstract3501)            Save
    This paper considers the existence and uniqueness of limit cycle for a planar autonomous system x=Q(x,y), y=P(x). The conditions of existence of limit cycle in papers [7~9] are simplified, in addition, The uniqueness of limit cycle is discussed. Simpler conditions for the existence and uniqueness of limit cycle are obtained.
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