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| 1 | Optimal Harvesting and Stability for a Predator-prey System with Stage Structure显示文摘The dynamics of a predator-prey system, where prey population has two stages, an immature stage and a mature stage with harvesting, the growth of predator population is of Lotka-Volterra nature, are modelled by a system of retarded functional differential equations. We obtain conditions for global asymptotic stability of three nonnegative equilibria and a threshold of harvesting for the mature prey population. The effect of delay on the population at positive equilibrium and the optimal harvesting of the mature prey population are also considered. | Xin-yu Song, Lan-sun ChenDepartment of Mathematics. Xinyang Teachers College, Henan 464000, ChinaInstitute of Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing100080, China | 2002 | Acta Mathematicae Applicatae Sinica2002，18，3： | 11 |
| 2 | The expression of glucose regulated protein-94 in colorectal carcinoma cells treated by sodium butyrate显示文摘The expression of glucose regulated protein 94 (GRP94)during the treatment of human colorectal carcinoma cell lineClone A cells with sodium butyrate was studied. Sodium butyrate (SB) can cause functional and morphological effects on Clone A cells including growth arrest at Go/G1 stage and cell differentiation as observed by morphological changes, MTT and flow cytometry assays, as well as reduced Grp94 gene expression as shown by Northern blot and Western blot assays. The possible mechanism of the correlation between Grp94 gene expression and tumor growth inhibition and cell differentiation is briefly discussed. | WU YI DI JIN DAN SONG( Fax: (024)23256087 E-mail: jdsong@sun10.cmu.edu.cn)(Key Laboratory of Cell Biology, Ministry of Public Health of ChinaInstitute of Medical Molecular Biology, China Medical University, 92 Beier Rd. Heping District, Shenyang 110001, | 2000 | Cell Research2000，10，2： | 9 |
| 3 | Establishment and evaluation of the system of extracorporeal liver perfusion in pigs显示文摘BACKGROUND; In recent years, extracorporeal liver per- fusion (ECLP) has been regarded as a treatment of acute liver failure ( ALF ); but the system of ECLP has many problems. The purpose of this experiment was to detect the factors affecting the system of ECLP and to establish a sta- ble and effective system of ECLP. METHODS; Livers were harvested from health pigs, ac- cording to the different styles of perfusion and oxygena- tion, which were randomly divided into 3 groups. The liv- ers in group A (n =4) were subjected to single portal vein perfusion, oxygenating perfusion blood; the livers in group B (n =4) to dual ( portal vein and hepatic artery) vessel perfusion, oxygenating blood, together; and the livers in group C ( n = 4) to dual (portal vein and hepatic artery) vessel perfusion, but oxygenating blood, separately. The perfusion time, the data of bile production, and hemody- namic parameters of extracorporeal livers in each group were tested. The histological examination of liver tissues from each group was performed at the end of perfusion. RESULTS: The perfusion time of the liver in group A is significantly shorter than in groups B and C (P<0.05). At 1 , 3 , 6 hours after perfusion, the data of bile production and hemodynamic parameters of livers in group A were sta- tistically different from those of livers in groups B and C (P<0.05). At 1, 3, 6 hours after perfusion, the data of group B were not statistically different from those of livers in group C (P>0.05). But at 12 hours after perfusion, the data of group B were statistically different from those of liv- ers in group C (P<0.01). CONCLUSION: The system of ECLP, which is performed by dual ( portal vein and hepatic artery) vessel perfusionand oxygenating blood separately, is more stable and effec- tive to keep the function of extracorporeal liver. | Jin Gong, Xi-Mo Wang, Gang Long, Zhong-Tao Guo, Tao Jiang and Shi Chen Wuhan, ChinaInstitute of Organ Transplantation, Tongji Hospital, Tongji Medical College , Huazhong University of Science and Technology, Wuhan 430030, China Department of Surgery, Tianjin People’s Hospital, Tianjin 300120, China | 2005 | Hepatobiliary & Pancreatic Diseases International2005，4，1： | 7 |
| 4 | Attractors and Dimensions for Discretizations of a Dissipative Zakharov Equations显示文摘Abstract In this paper, a dissipative Zakharov equations are discretized by difference method.We make priorestimates for the algebric system of equations. It is proved that for each mesh size,there exist attractors forthe discretized system.The bounds of the Hausdorff dimensions of the discrete attractors are obtained,and thevarious bounds are dependent of the mesh sizes. | Qian-shun Chang, Bo-ling GuoInstitute of Applied Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences,Beijing 100080, ChinaInstitute of Applied Physics and Computational Mathematics, Beijing 100088, China | 2002 | Acta Mathematicae Applicatae Sinica2002，18，2： | 3 |
| 5 | Minimal Martingale Measures for Discrete-time Incomplete Financial Markets显示文摘Abstract In this note, we give a characterization of the minimal martingale measure for a general discrete-time incomplete financial market.Then we concretely work out the minimal martingale messure for a specificdiscrete-time market model in which the assets’returns in different times are independent. | Ping Li, Jian-ming XiaInstitute of System Sciences, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100080, ChinaInstitute of Applied Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100080, China | 2002 | Acta Mathematicae Applicatae Sinica2002，18，2： | 2 |
| 6 | The sea/land breeze in the northern coastal area of Shandong Peninsula显示文摘In this paper the seasonal variation and structural characteristics of the sea/ land breeze in the northern coastal area of' Shandong Peninsula are studied in two ways: one is the analysis of the observed wind data, and the other is numerical simulation and experiments. Firstly, the hour to hour wind data through the year 1984 at Longkou Meteorological Station and Yantai Oceanographic Station are analysed through energy spectra and hodograph. It is revealed from the analysed results that the effects of the sea/ land breeze in the area are notable in spring, summer and fall, especially in May. However, in winter the effects of sea / land breeze are not obvious. because the cold noitherly is prevailing. Secondly, a two-dimensional non- linear model of primitive equations is used to study the sea / land breeze circulation in May in the area. The results of numerical simulation consist basically with the analysed results of the observed sea / land breeze. A reasonable theoretical structure of the sea / | Wang Sizhen and Song Xilong Ocean University of Qingdao. Qingdao. ChinaInstitute of Oceanology, Academia Sinica. Qingdao, China | 1989 | Acta Oceanologica Sinica1989，8，3： | 2 |
| 7 | Bifurcation and Chaos in a Weakly Nonlinear System Subjected to Combined Parametric and External Excitation显示文摘In this paper the dynamics of a weakly nonlinear system subjected to combined parametric and external excitation are discussed. The existence of transversal homoclinic orbits resulting in chaotic dynamics and bifurcation are established by using the averaging method and Melnikov method. Numerical simulations are also provided to demonstrate the theoretical analysis. | Wei Li, Peng-cheng XuInstitute of Mathematics, Beijing University of Chemical Technology, Beijing 100029, ChinaInstitute of Applied Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100080, China | 2002 | Acta Mathematicae Applicatae Sinica2002，18，3： | 1 |
| 8 | Optical Recording Performance of Azo Nickel Chelate Thin Film显示文摘 | YIN Jinlong WANG Shuangqing GAN Fuxi(Shanghai Institute of Optics and Fine Mechanics The Chinese Academy of Sciences Shanghai 201800 ChinaInstitute of Photographic Chemistry The Chinese Academy of Sciences Beijing 100101 China) | 1999 | Chinese Journal of Lasers1999，，05： | 1 |
| 9 | A study of the chemical composition and transport of marine aerosols over the ocean near China显示文摘In this paper the authors cite the aerosol samples collected with a KA-200 Anderson cascade Impactor and a KB-120 sampler during the first cruise of the Kuroshio investigation operated by the People’s Republic of China and Japan cooperative program, from July 23 to August 21, 1987. The concentration size distributions and composition of marine aerosols over the Kuroshio area are analyzed. Neutron activation analysis is used to determine the elemental composition of the aerosols. The authors also discuss some characteristics of marine aerosols relating to long-range transport of crustal and anthropogenic elements from the continent to the remote ocean. Analytical results indicate that elements Al, Fe, Sc and Sb over this area are obviously influenced by the continent of Asia, and the size distributions are changed after long-range transport. The concentration of large particles increase. The concentrations of the elements C1 and Na are closely related to ocean conditions; the source of the elements Cl | Zhang Ni, Zhou Mingyu, Lu Naiping, F. P. Parungo, Wen Yupu, Yang Shaojing, Yang Yinan and Chen Binru National Research Center for Marine Environmental Forecasts, State Oceanic Administration, Beijing, ChinaNational Oceanic and Atmospheric Administration, Environmental Research Laboratories, Air Resources Laboratory, Boulder,CO, U.S. A.Academy of Meteorological Sciences, State Meteorological Administration, Beijing, ChinaInstitute of High Energy Physics, Academia Sinica, Beijing, China | 1991 | Acta Oceanologica Sinica1991，10，3： | 1 |
| 10 | Effects of fluoride on growth and reproduction of the army worm, Mythimna separata (Walker)显示文摘This paper deals with effects of airborne fluorine on the army worm, Mythimna separata (Walker), by rearing the larvae on the wheat foliage exposed to HF or fumigating the larvae on the artificial diet with the pollutant. Larval relative growth rate (GR) and index of population trend of the insect reduced by 5% and 11%, respectively, when the larvae were reared on the foliage taken from the wheat plants exposed to 0.87 g·dm-2·day-1 of fluorine compared with those of the control. An extra instar appeared in a majority of the larvae treated. Survival rate and GR of the larvae on the wheat plant being exposure to the same concentration of fluorine in field open-top fumigation device were 40% and 15% lower than that of the control, respectively. Similar experiment with the insect on the artificial diet also showed that direct impact of the pollutant on the army worm was greater than its indirect effect via their host plant. | Gong Peiyu, Li Xiuzhen, Wu Kunjun Shu Jianmin and Cao Hongfa Institute of Zookogy,Academia Sinica,Beijing 100080,ChinaInstitute of Zookogy,Chinese Research Academy of Environmental Science,Beijing 100012,China | 1990 | Journal of Environmental Sciences1990，2，4： | 1 |
| 11 | The Role and Influence of the Orthodoxy in Russian Politics显示文摘The Orthodoxy has been in existence in Russia for more than 1000years and has fully merged itself into the nation,creating a strongsense of religious culture.During the long years of the reigns by differ-ent regimes from the Czarist Russia to the Soviet Union and then to thenew Russia,the religion went through the process of ups and downs inits development.Having once played a very important role in the | Jiang Li Jiang Li is an Associate Research Professor at the Division for Eurasian Studies,ChinaInstitute of Contemporary International Relations | 2002 | Contemporary International Relations2002，12，10： | 0 |
| 12 | Objective and quantitative evaluation of environmental quality of the land for agriculture purpose显示文摘An objective and quantitative evaluation method on land environmental quality for agricultural purpose in a county range is studied in this paper. The method takes into account the quantity of heat, precipitation, meteorological disaster and soil fertility, which have close relationship to the potential productivity of land and can be expressed conveniently and accurately by taking Kai County as an example. Besides comprehensive grading assessment, assessment with Hilbert Space distance coefficiency and comprehensive judgement by fuzzy sets theory, the assessment factors are expanded to 18 parameters, and fuzzy dominance matrix and fuzzy clustering methods are adopted for regional comprehensive identification of agriculture-use land. Among these methods, each benefits from association with the other. In this paper, an all-round and objective new way for understanding of land environmental quality is put forward. | Ning Datong, Wang Sufen and Sun RuomeiInstitute of Environmental Sciences,Beijing Normal University,Beijing 100875,ChinaInstitute of Rural Development,Chinese Academy of Social Science,Beijing 100020,China | 1991 | Journal of Environmental Sciences1991，3，1： | 0 |
| 13 | L_m Extremal Polynomials Associated with Generalized Jacobi Weights显示文摘Asymptotic estimations of the Christoffel type functions for Lm extremal polynomials with an even integer m associated with generalized Jacobi weights are established. Also, asymptotic behavior of the zeros of the Lm extremal polynomials and the Cotes numbers of the corresponding Turan quadrature formula is given. | Ying-guang ShiDepartment of Mathematics, Hunan Normal University, Changsha 410081, ChinaInstitute of Computational Mathematics&Scientific/Engineering Computing,Academy of Mathematics and System Science,Chinese Academy of Sciences,P.O.Box 2719,Beijing 100080,China | 2003 | Acta Mathematicae Applicatae Sinica2003，19，2： | 0 |
| 14 | Ecological and environmental characteristics and management planning of Mawei Economic Development District显示文摘The natural and social background of the district was described, and the major ecological and environmental problems were analysed. The measures and planning for the ecological and environmental protection were recommended. Systematic analysis method and environmental mathematical models were suggested to be used for the ecological and environmental general planning in this paper. | Ye Changming, Wei Aixue, Huang Yuyao, Zhang Xifu, Chen Qihao and Liu JifengResearch Center for Eco-Environmental Sciences,Acadcmis Sinica,Beijing 100083,ChinaInstitute of Zoology,Academia Sinica,Beijing 100080,ChinaInstitute of Atmospheric Physics,Academia Sinica,Beijing 100083,ChinaFuzhou Municipal Institute of Environmental Sciences,Fuzhou 350005,ChinaFuzhou Municipal Environmental Monitoring Station,Fuzhou 350005,China | 1991 | Journal of Environmental Sciences1991，3，2： | 0 |
| 15 | Annealing High Resistivity CdZnTe Wafers under Controlled Cd/Zn Partial Pressures显示文摘In order to improve the performances of CdZnTe γ-ray detector, it is key issue to get the crystal with high quality. Equilibrium partial pressures, PCd and PZn, over Cd1-xZnx melt were estimated based on thermodynamic relationship and then Cd0.9Zn0.1Te wafers were annealed under controlled Cd/Zn partial pressures provided by Cd1-xZnx alloy reservoir. The experimental results show that when CdZnTe wafers are annealed under the equilibrium partial pressures provided by Cd0.99Zn0.01 alloy reservoir for 5 days or more at 1073 K, the resistivity of the wafer can be raised by 6 times and IR transmittance raised by 10% or more, the size and density of Te precipitates are greatly reduced.Moreover, losing of Zn from the surface can be avoided, which leads to improvement of the Zn radial distribution.In addition, the relationship between the electrical performances of the wafers and different controlled pressures is also discussed. | Wanwan LI, Wenbin SANG, Bin ZHANG, Jiahua MIN and Fang YUSchool of Material Science and Engineering, Jiading Campus, Shanghai University, Shanghai 201800, ChinaInstitute of Composites Materials, Shanghai Jiao Tong University, Shanghai 200030, China | 2004 | Journal of Materials Science & Technology2004，20，6： | 0 |
| 16 | Sea level change along the coast of China relative to the isostatic datum显示文摘On the basis of the analyses of significant periods for the sea level observation data taken from recent several decades at 12 tide stations, the monthly mean sea level observations are fitted by a model of linear trend of sea level change superimposed with several variations of different fixed periods. The trends of sea level relative changes and their errors are estimated by the LS method. The results are reduced to the isostatic datum proposed and established in the paper (Huang et al. , 1991, Seismology and Geology , 1, 1-15). The trends of sea level changes in the near future along the coast of China are studied. It is pointed out that the general trend of the sea level change along the coast of China is going up slowly and the rate of the change is not the same in different segments of the coasts. In a few segments, the sea level is even relatively going down. The numerical results given in this paper provide a basis for the predictions of the future sea level changes and their effects. | Huang Liren, Yang Guohua An Zhensheng Geodetic Brigade, State Seismological Bureau, Tianjin 300180, ChinaInstitute of Marine Scientific and Technological Information, State Oceanic Administration, Tianjin 300171, China Xie Zhiren, A brief discussion on the trend of sea level change and prediction, 1989. | 1991 | Acta Oceanologica Sinica1991，10，4： | 0 |
| 17 | Analysis on Source Process of Strong Earthquakes in Qinghai Province Based on Broadband Data显示文摘Four earthquakes with M > 6.0 occurred in Qinghai Province, China froth 1988 to 1990. Using broadband data from GDSN, the source ruptures of these earthquakes and tectonic surroundings were studied using waveform modelling combined with background data of geological tectonics. Through the analysis of apparent source time function (aSTF) and apparent time difference (aTD), the complexity of sources was discussed, and in view of source analysis, the result further supports the conclusion that the compressive stress axis of tectonic stress field in northeastern Qinghai-Xizang (Tibetan) plateau is at the NE direction, is nearly horizontal, turns counter-clockwise to the NEE or N to S direction, and is nearly horizontal close to the northern Qinghai-Xizang plateau. | Gao Yuan, Wu Zhongliang, and Zhou HuilanGraduate School of USTC, Academia Sinica, Beijing 100039, ChinaCenter for Analysis and Prediction, China Seismological Bureau, Beijing 100036, ChinaInstitute of Geophysics, China Seismological Bureau, Beijing 100081, China | 1998 | Earthquake Research in China1998，12，3： | 0 |
| 18 | The Grouping of the Strike-Slip Offset Data and Its Relation With the Seismicity Along Middle Segment of the Xiaojiang Active Fault显示文摘The data of the strike-slip offset along the Xiaojiang active fault can be obviously grouped.The groups of small orders of magnitude data within 100 m show clear linear characteristics of increments between 8 m and 12 m,which indicates that the segments of the Xiaojiang active fault is of characteristic seismicity and the distribution of the values of each group indicates that there are smaller earthquakes and creep between two large earthquakes along each segment of the Xiaojiang active fault.The interval between two characteristic large earthquakes can be calculated with the increments for two groups of slip data and the slip rate of the fault.Furthermore,the frequency of smaller earthquakes can also be estimated by comparing the distributions of the displacements of the large earthquakes with the distributions of the values of each group of data.The groups of large slip displacements show that there is close relationship between the records of the displacements of the fault and the changes of the | Shen Jun,Wang Yipeng,Song Fangmin,Yu Weixian,Cao Zhongquan,Shen Xuhui,Hou Xueying,and Li ZhixiangInstitute of Geology,SSB,Beijing 100029,ChinaInstitute of Earthquake Engineering,Seismological Bureau of Yunnan Province,Kunming 650204,China | 1998 | Earthquake Research in China1998，12，2： | 0 |
| 19 | Substructure Method of Three-Dimensional Semi-Analytic Boundary Element and Its Application to Seismic Scattering of Hill Topography显示文摘In this paper,a substructure method of three-dimensional semi-analytic boundary element is established.The seismic scattering by three-dimensional topography of a hill can be analyzed by the method in frequency domain.Using this method,the computational effort and storage space are reduced considerably.Finally,analytic results are given. | Zhao Chenggang,Du Xiuli and Li XiaojunNorthern Jiaotong University,Beijing 100044,ChinaInstitute of Water Conservauon and Hydroelecmc Power Research,Beijing 100044,China Institute of Geophysics,SSB,Beijing 100081,China | 1994 | Earthquake Research in China1994，8，4： | 0 |
| 20 | Multisymplectic Structure and Multisymplectic Scheme for the Nonlinear Ware Equation显示文摘Abstract The multisvmplectic structure of the nonlinear wave equation is derived directly from the variationalprinciple. In the numerical aspect,we present a multisymplectic nine points scheme which is equivalent to themultisymplectic Preissman scheme.A series of numerical results are reported to illustrate the effectiveness ofthe scheme. | Yu-shun WANG, Meng-zhao QINLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Computational Mathematics, Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 100080, China | 2002 | Acta Mathematicae Applicatae Sinica2002，18，1： | 0 |
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