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| 1 | Active tectonic blocks and strong earthquakes in the continent of China显示文摘The primary pattern of the late Cenozoic to the present tectonic deformation of China is characterized by relative movements and interactions of tectonic blocks. Active tectonic blocks are geological units that have been separated from each other by active tectonic zones. Boundaries between blocks are the highest gradient of differential movement. Most of tectonic activity occurs on boundaries of the blocks. Earthquakes are results of abrupt releases of accumulated strain energy that reaches the threshold of strength of the earth's crust. Boundaries of tectonic blocks are the locations of most discontinuous deformation and highest gradient of stress accumulation, thus are the most likely places for strain energy accumulation and releases, and in turn, devastating earthquakes. Almost all earthquakes of magnitude greater than 8 and 80%-90% of earthquakes of magnitude over 7 occur along boundaries of active tectonic blocks. This fact indicates that differential movements and interactions of active tectonic blocks are the primary mechanism for the occurrences of devastating earthquakes. | ZHANG Peizhen (张培震) DENG Qidong (邓起东) ZHANG Guomin (张国民) MA Jin (马 瑾) GAN Weijun (甘卫军) MIN Wei (闵 伟) MAO Fengying (毛凤英) WANG Qi (王 琪) | 2003 | Science China Earth Sciences2003，46，z2： | 239 |
| 2 | SINGULAR PERTURBATION FOR A CLASS OF NONLINEAR REACTION DIFFUSION SYSTEMS显示文摘This paper deals with the initial-bounndary value problem for the wider nonlinear reaction diffusion system: where Leading into the variables of multiple scales, we obtained a uniformly valid asymptotic solution to any degree of precision by using comparison theorem. | 莫嘉琪 | 1989 | Science China Mathematics1989，32，11： | 213 |
| 3 | A CLASS OF SINGULARLY PERTURBEDBOUNDARY VALUE PROBLEMS FOR NONLINEARDIFFERENTIAL SYSTEMS显示文摘The singularly perturbed nonlinear problem εy' = f(x, y’)y + g(x, y’), 0 | MO Jiaqi (Department of Mathematics, Anhui Normal University, Wuhu 241000, China) | 1999 | Systems Science and Mathematical Sciences1999，12，1： | 51 |
| 4 | A CLASS OF NONLOCAL SINGULARLY PERTURBED PROBLEMS FOR NONLINEAR HYPERBOLIC DIFFERENTIAL EQUATION显示文摘The nonlocal singularly perturbed problems for the hyperbolic differential equation are considered. Under suitable conditions, using the fixed point theorem, the asymptotic behavior of solution for the initial boundary value problems is studied. | 莫嘉琪 | 2001 | Acta Mathematicae Applicatae Sinica2001，17，4： | 41 |
| 5 | Oscillation of Solutions of Nonlinear Partial Differential Equations of Neutral Type | Yu Yuanhong Liu Bin Liu Zhengrong Institute of Applied Mathematics, Academia Sinica, Beijing 100080, China Department of Mathematics, Hubei Normal College, Huangshi 435002. China Department of Mathematics, Yunnan University. Kunming 650091. China Institute of Applied Mathematics of Yunnan Province, Kunming 650091, China | 1997 | Acta Mathematica Sinica,English Series1997，13，4： | 39 |
| 6 | Combined detection of serum tumor markers for differential diagnosis of solid lesions located at the pancreatic head显示文摘BACKGROUND: The differential diagnosis of solid lesions located at the pancreatic head is very important for choosing therapies and setting up surgical tactics. This study was designed to evaluate the clinical significance of combined measurement of multiple serum tumor markers and the application of the receiver-operating characteristic (ROC) curves in the differential diagnosis of solid lesions located at the pancreatic head. METHODS: The serum levels of CA19-9, CA242, CA50 and carcinoembryonic antigen (CEA) in 112 patients with carcinoma of the pancreatic head and 38 patients with focal chronic pancreatitis in the pancreatic head were measured with ELISA. The sensitivity, specificity, positive likelihood ratio (PLR) and negative likelihood ratio (NLR) of the four serum tumor markers were calculated. The ROC curves for the four serum tumor markers were constructed and the area under the curve (AUC) was calculated. RESULTS: The AUCs of CA19-9, CA242, CA50 and CEA were 0.805, 0.749, 0.738 and 0.705; the PLRs were 1.91, 3.43, 5.09 and 5.46; and the NLRs were 0.41, 0.56, 0.59 and 0.71, respectively. Combined measurements increased the diagnostic specificity, and parallel combined testing increased the diagnostic sensitivity. CONCLUSIONS: Combined measurement of serum tumor markers CA19-9, CA242, CA50 and CEA is valuable in differential diagnosis of solid lesions located at the pancreatic head, and CA19-9 has the best diagnostic ability. Combined measurements can increase the specificity ofdiagnosis. Evaluation with the ROC curve is better than the sensitivity or specificity alone and the results are more integrated and objective. | Liao, Quan Zhao, Yu-Pei Yang, Ying-Chi Li, Li-Jun Long, Xiao Han, Shao-Mei | 2007 | Hepatobiliary & Pancreatic Diseases International2007，6，6： | 27 |
| 7 | On the Hyper-Order of Solutions of Some Second-Order Linear Differential Equations | CHEN Zong Xuan Department of Mathematics. Jiangxi Normal University. Nanchang 330027. P. R. China | 2002 | Acta Mathematica Sinica,English Series2002，18，1： | 24 |
| 8 | THEORY OF VALUES OF SINGULAR POINT IN COMPLEX AUTONOMOUS DIFFERENTIAL SYSTEMS显示文摘Consider the complex autonomous differential system (E). The main results of this paper are as follows: (i) The concept of values of singular point has been defined. It can realize the unity between the saddle values and the focal values in real systems, (ii) By defining the concept of the Lie-invariant, the constructive theorem of values of singular point and the extended symmetric principle can be obtained. (iii) All the 120 elementary Lie-invariants of (E3) have been computed. The constructive theorem being used, formulas of values of singular point and the integrability conditions of (E2) and (E(3)3) have been derived. | 刘一戎 李继彬 | 1990 | Science China Mathematics1990，33，1： | 23 |
| 9 | MAXIMUM PRINCIPLE FOR OPTIMAL CONTROLPROBLEM OF FULLY COUPLEDFORWARD-BACKWARD STOCHASTIC SYSTEMS显示文摘The optimal control problem of fully coupled forward-backward stochastic systems is put forward. A necessary condition, called maximum principle, for an optimal control of the problem with the control domain being convex is proved. | WU Zhen(College of Mathematics and System Sciences, Shandong University, Ji’nan 250100, China) | 1998 | Systems Science and Mathematical Sciences1998，11，3： | 21 |
| 10 | Stability analysis of solutions to nonlinear stiff Volterra functional differential equations in Banach spaces显示文摘A series of stability, contractivity and asymptotic stability results of the solutions to nonlinear stiff Volterra functional differential equations (VFDEs) in Banach spaces is obtained, which provides the unified theoretical foundation for the stability analysis of solutions to nonlinear stiff problems in ordinary differential equations(ODEs), delay differential equations(DDEs), integro-differential equations(IDEs) and VFDEs of other type which appear in practice. | LI Shoufu | 2005 | Science China Mathematics2005，48，3： | 20 |
| 11 | NONLINEAR STABILITY OF NATURAL RUNGE-KUTTA METHODS FOR NEUTRAL DELAY DIFFERENTIAL EQUATIONS显示文摘This paper first presents the stability analysis of theoretical solutions for a class of nonlinear neutral delay-differential equations (NDDEs). Then the numerical analogous results, of the natural Runge-Kutta (NRK) methods for the same class of nonlinear NDDEs, are given. In particular, it is shown that the (k, l)-algebraic stability of a RK method for ODEs implies the generalized asymptotic stability and the global stability of the induced NRK method. | Cheng-jian Zhang(Department of Mathematics, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China) | 2002 | Journal of Computational Mathematics2002，20，6： | 18 |
| 12 | B-Theory of Runge-Kutta methods for stiff Volterra functional differential equations显示文摘B-stability and B-convergence theories of Runge-Kutta methods for nonlinear stiff Volterra func-tional differential equations (VFDEs) are established which provide unified theoretical foundation for the studyof Runge-Kutta methods when applied to nonlinear stiff initial value problems (IVPs) in ordinary differentialequations (ODEs), delay differential equations (DDEs), integro-differential equations (IDEs) and VFDEs ofother type which appear in practice. | 李寿佛 | 2003 | Science China Mathematics2003，46，5： | 18 |
| 13 | 关于二阶变系数线性微分方程求解法的研究显示文摘求二阶变系数线性微分方程的解,至今为止没有一种成规的方法.推导二阶变系数线性微分方程的一般解法.从特殊型和一般型的二阶变系数线性微分方程进行研究,从方程的自身特点出发,巧妙构造结构,利用降阶法把二阶变系数线性微分方程的求解问题转嫁为求一阶线性微分方程的解.只须构造结构系数函数即可解决二阶变系数线性微分方程通解或特解.利用构造结构的系数函数,再用降阶法可以求得二阶变系数线性微分方程通解或特解的一般方法. | 李高 常秀芳 | 2010 | 河北北方学院学报(自然科学版)2010，26，6： | 18 |
| 14 | Computational uncertainty principle in nonlinear ordinary differential equations (I)——Numerical results显示文摘In a majority of cases of long-time numerical integration for initial-value problems, roundoff error has received little attention. Using twenty-nine numerical methods, the influence of round-off error on numerical solutions is generally studied through a large number of numerical experiments. Here we find that there exists a strong dependence on machine precision (which is a new kind of dependence different from the sensitive dependence on initial conditions), maximally effective computation time (MECT) and optimal stepsize (OS) in solving nonlinear ordinary differential equations (ODEs) in finite machine precision. And an optimal searching method for evaluating MECT and OS under finite machine precision is presented. The relationships between MECT, OS, the order of numerical method and machine precision are found. Numerical results show that round-off error plays a significant role in the above phenomena. Moreover, we find two universal relations which are independent of the types of ODEs, initial | 李建平 曾庆存 丑纪范 | 2000 | Science China(Technological Sciences)2000，43，5： | 18 |
| 15 | Existence of almost periodic solutions of neutral differential equations with piecewise constant argument显示文摘Based on the properties on almost periodic sequence, it is proved that the almost periodic solutions for a class of neutral differential equations with piecewise constant argument exist. | 袁荣 洪佳林 | 1996 | Science China Mathematics1996，39，11： | 18 |
| 16 | Isolation of osRACD gene encoding a small GTP-binding protein from rice显示文摘Using an improved version of mRNA differential display technology, we have obtained a differentially displayed fragment RDP-8. Homologous comparison indicated that the fragment RDP-8 has high homology with the gene encoding maize small GTP-binding protein. By screening cDNA library of the rice Nongken 58N panicle using the newly obtained fragment RDP-8 as probe, we further found the full-length cDNA of osRACD gene that encodes a rice small GTP-binding protein. As compared with maize RACD gene, the osRACD of rice shows remarkable homology in both nucleotide sequence and amino acid sequence, 88% and 97% respectively. Evidence from RT-PCR study indicates that osRACD gene is related to photoperiod fertility conversion of photoperiod sensitive genie male sterility (PSGMS) rice. | Ml Zhiyong WANG Shusheng WU Naihu | 2002 | Chinese Science Bulletin2002，47，20： | 17 |
| 17 | Screen for stage-specific expression genes between tail bud stage and heartbeat beginning stage in embryogenesis of gynogenetic silver crucian carp显示文摘A systemic study was initiated to identify stage-specific expression genes in fish embryogenesis by using suppression subtractive hybridization (SSH) technique. In this study, we presented a preliminary result on screen for stage-specific expression genes between tail bud stage (TBS) and heartbeat beginning stage (HBS) in gynogenetic silver crucian carp (Carassius auratus gibelio). Two SSH plasmid libraries specific for TBS embryos and HBS embryos were constructed, and stage-specific expression genes were screened between the two stages. 1963 TBS positive clones and 2466 HBS positive clones were sampled to PCR amplification, and 1373 TBS and 1809 HBS PCR positive clones were selected to carry out dot blots. 169TBS dot blot positive clones and 272 HBS dot blot positive clones were sequenced. Searching GenBank by using these nucleotide sequences indicated that most of the TBS dot blot positive clones could not be found homologous sequences in the database, while known genes were mainly detected from HBS dot blot positive clones. Of the 79 known genes, 20 were enzymes or kinases involved in important metabolism of embryonic development. Moreover, specific expressions of partial genes were further confirmed by virtual northern blots. This study is the first step for making a large attempt to study temporal and spatial control f gene expression in the gynogenetic fish embryogenesis. | YAO HUA SHI, JUN LIU, JIAN HONG XIA, JIAN FANG GUIState Key laboratory of Freshwater Ecology and Biotechnology, Wuhan Center for Developmental Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China | 2002 | Cell Research2002，12，2： | 17 |
| 18 | Relative position determination of a lunar rover using high-accuracy multi-frequency same-beam VLBI显示文摘Multi-frequency same-beam VLBI means that two explorers with a small separation angle are simultaneously observed with the main beam of receiving antennas. In the same-beam VLBI, the differential phase delay between two explorers and two receiving telescopes can be obtained with a small error of several picoseconds. The differential phase delay, as the observable of the same-beam VLBI, gives the separation angular information of the two explorers in the celestial sphere. The two-dimensional relative position on the plane-of-sky can thus be precisely determined with an error of less than 1 m for a distance of 3.8×105 km far away from the earth, by using the differential phase delay obtained with the four Chinese VLBI stations. The relative position of a lunar rover on the lunar surface can be determined with an error of 10 m by using the differential phase delay data and the range data for the lander when the lunar topography near the rover and the lander can be determined with an error of 10 m. | LIU QingHui1, CHEN Ming1, XIONG WeiMing2, QIAN ZhiHan1, LI JinLing1, HAO WangHong1,4, WANG GuangLi1, ZHENG WeiMin1, GUAN Di3, ZHU RenJie1, WANG WeiHua1, ZHANG XiuZhong1, JIANG DongRong1, SHU FengChun1, PING JinSong1 & HONG XiaoYu11 Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China 2 Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China 3 Lunar Explorer Engineering General Department, Chinese Academy of Sciences, Beijing 100012, China 4 Beijing Institute of Tracking and Telecommunications Technology, Beijing 100094, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，3： | 17 |
| 19 | Rare adult gastric duplication cyst mimicking a gastrointestinal stromal tumor显示文摘Gastric duplication cyst is a very rare gastrointestinal tract malformation that accounts for 2%-4%of alimentary tract duplications.Most cases are diagnosed within the first year of life,following presentation of abdominal pain,vomiting,and weight loss and clinical discovery of an abdominal palpable mass.This case report describes a very uncommon symptomatic gastric duplication cyst diagnosed for the first time in adulthood.Only a few other case reports of similar condition exist,and all were identified by endosonography.The current case involves a 52-year-old male who presented with a onemonth history of progressive iron deficiency anemia without overt gastrointestinal bleeding.The patient underwent esophagogastroduodenoscopy,which revealed a 2.0 cm pinkish subepithelial lesion,suspected to be a gastrointestinal stromal tumor(GIST)and source of gastrointestinal bleeding.The endosonography showed inhomogeneous hypoechoic lesions with focal anechoic areas arising from a second and third layer of the gastric wall.Differential diagnoses of GIST,neuroendocrine tumor,or pancreatic heterotopia were made.The lesion was removed using an endoscopic submucosal resection technique.Histopathology revealed an erosive gastric mass composed of a complex structure of dilated gastric glands surrounded by fibro-muscular tissue,fibroblasts,and smooth muscle bundles,which led to the diagnosis of gastric duplication. | Morakod Deesomsak Pitulak Aswakul Pairoj Junyangdikul Varayu Prachayakul | 2013 | World Journal of Gastroenterology2013，19，45： | 17 |
| 20 | 基于相对增益和改进粒子群算法的PSS与直流调制协调策略显示文摘现有电力系统稳定器(power system stabilizer,PSS)和直流调制多使用本地信号作为控制器反馈输入信号,控制器间的交互作用可能降低甚至破坏系统稳定性。提出了一种基于广域测量信号的PSS与直流调制协调策略,首先通过留数法选择对于振荡模态可观性较强的广域信号作为阻尼控制器备选反馈信号;其次通过相对增益方法选择使PSS和直流调制交互影响最小的备选信号作为最佳反馈信号;而后设计分散控制器,并运用基于混沌和差分进化的混合粒子群优化算法对PSS和直流调制控制器参数进行协调优化。最后,通过EPRI 36节点系统仿真验证了协调策略的正确性和有效性。 | 王曦 李兴源 赵睿 | 2014 | 中国电机工程学报2014，34，34： | 17 |
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