Minimal Periodic Solutions of SuperquadraticFirst Order Convex Hamiltonian Systems

This paper generalizes all known results on Rabinowitz's minimal periodic solution conjecture under the assumption that Hamiltonian function is C2 strictly convex.     

The Minimal Periodic Solutions to The Subquadratic Second Order Hamiltonian Systems

The existence of the minimal periodic solutions to two classes of the nonconvex subquadratic autonomous second order Hamiltonian systems is studied on the basis of the Rabinowitz' s saddle point theorem and the Morse index estimation of its critical points.     

Existence of Periodic Solutions for Reaction-diffusion Systems with Time Delays

Periodic solutions of reaction-diffusion systems with time delays are investigated. The upper and lower control function of nonmonotone reaction term is constructed. It is showed that the function satisfies a global Lipschitz condition and quasimonotone. A sort of effective method of studying differential equation with nonmonotone reaction term is gained. It is shown that periodic solutions of this system exist when reaction-term is not monotone and the boundary value system has a pair of coupled to-upper and lower solutions.     

Multiple Periodic Solutions with Fixed Period for N-body Type Problems

Using the equivariant Ljusternik-Schnirelmann theory,the estimates of the lower bound of functional values on collision sets and the estimates of the critical values for the variational functional,we obtain some results in the large concerning multiple geometrically distinct noncollinear periodic solutions of any fixed mininal period for a class of planar N body type problems. [WT5HZ]     

Existence and Stability of Periodic Solutions for Reaction-diffusion Systems with Time Delays

Periodic solutions of reaction-diffusion systems with time delays are investigated. It is constructed that the - per and lower control function of nonmonotone reaction term, and it is showed that the function satisfies a global Lipschitz condition and quasimonotone. A sort of effective method of studying differential equation with nonmonotone reaction term is gained. By using the method of upper and lower solutions and fixed point theorem, it is shown that periodic solutions of this system exist when reaction-term is not monotone and the boundary value system has a pair of coupled-upper and lower solutions. Some methods for proving the stability of the periodic solution are also given. And some known resuits are extended.     

Solutions to the Problems Lies in Application of RAID Technology

The RAID technology is relatively mature now and applied widely in serverand even micro computer, but due to lack of experience in its application,even professional engineers feel at loss about the problems lisuchas, disk array information recovery when RAID corrupt, original data retaining when RAID corrupt for commixing disk's levels, when and how to resume lower version of BIOS of the disk array, why system down at time of mirror operation and how to solve it. The writer summaries solutions for 4 typical cases based on his experience in relevant work, to provide reference for readers that have similar problems, in the hope of helping them recovery the disk array fast.     

玉米施肥中存在的问题及对策

玉米既是一种粮食作物,又是一种经济作物,同时它还是一种十分重要的饲料作物。尤其是近年来,随着畜牧业的迅猛发展,它在饲料加工业中所占的比重是其他任何一种饲料作物无法比拟的。     

平舆县小麦生长出现的问题及防治对策

平舆县是一个农业大县,全县18个乡镇,耕地面积8.7万hm^2,2007年全县小麦播种面积6．7万hm^2。由于播种期间土壤墒情较好,全县85％的地块达到一播全苗。     

The Existence of the Nontrivial Solutions to a Class of Quasilinear Elliptic Equations Involving Supercritical Exponents

under the assumptions that (r)=O(rb)as r and*相似文献   

Study on Application of Intelligent Material Systems and Structures to Civil Engineering

The fundamental principle and mechanical behavior of several intelligent material systems, such as shape memory alloy, piezoelectricity and fiber optic sensor etc. are discussed in this paper. Some application to civil engineering structures and related research are introduced briefly. The existing problems in the application and research are also presented at the same time. The future development of the intelligent material systems and structures are prospected and some proposals are put forward.     

Application of Grey Systems Theory to Social Economy Prediction for Circumjacent Reservoir Region

The paper depends on the new three theories(theory of dissipative structure.catastrophe theory and synergetics)as a guide,and establishes a developmental strategy planning forthe circumjacent reservoir regin of Longtan hydropower project which is the dragon head station often-cascade development along the Red Water Rlver,and adopts grey systems theory to predict theeconomic development of the reservoir region, The computational results show that the grey predic-tion model,the theory and methods of grey systems applying to economic system prediction are effi-clent.     

Design Approach to the Total Automation Systems of City Light Rail Transit

The design approach to the total automation systems of city light rail transit (LRT) is discussed, according to the specialty of city transport systems. Based on the operation modes and basic functions of LRT, the scheme of automation systems by using of the networked PLC systems is introduced. The general analysis for each sub automation systems is given, and the redundancy and fault tolerant function are emphasized.     

Synchronization of Chaotic Systems Employing the Theory of Application of Linear Time-varying Impulsive Differential Equations

Employing the stability theory of linear non-autonomous impulsive differential equations, some sufficient conditions for the synchronization of unified chaotic systems and Lorenz chaotic systems are derived. This method can be applied to most of chaotic systems. The numerical simulations also demonstrate the efficiency of impulsive control.     

The Application of Extrapolation of FEM to the Eigen Value Problems of Waveguide

On the basis of the method of linear finite element and taking the advantage of the theory of finite element extrapolation,the paper discusses the method for calculating the eigenvalue of waveguide.The results show the method is simple and has higher accuracy.     

The Operations Research Models and Techniques in the Production Planning of Flexible Manufacturing Systems

Based on the definition about the idea of Flexible Manufacture Systems(FMS), a three dimensional systematic views to represent the concept of the FMS production planning and scheduling problem is presented firstly. Next,a four-layer framework model of FMS' s production scheduling problem is put forward. Then, the operations research models and techniques in the static and dynamic scheduling of FMS operation are systematically analyzed, and the existing difficulties are pointed out. Finally,a brief introduction about the trend of using other approaches,such as artificial intelligence (AI) and artificial neural network (ANN), to solve the FMS planning and scheduling problems is given.     

季节性模型在杨凌示范区气温预报中的应用

运用季节性时间序列模型的理论和方法,对杨凌示范区张家岗1935—1945年月平均气温建立季节性模型,并利用所求得的模型对1946年各月平均气温进行预报。结果表明：1946年1月,2月和12月的月平均温度预报值的相对误差较大,同年3月—11月预报值的相对误差较小,其原因之一是中国北方每年1月,2月和12月温度较低,较小的波动就可能使相对误差很大,而3月—11月温度较高,相对误差较小。此外,该模型对步长较短的预测比较准确,误差较小,但对于步长较长的预测,误差较大。因此,该模型适合于短期预报。     

分子标记在棕榈植物遗传育种研究中的应用

随着分子标记的快速发展,已成为棕榈植物遗传改良的重要工具,在缩短育种进程、加快品种的选育和培育起到重要作用。本文综述了常见的分子标记在棕榈植物遗传多样性和亲缘关系分析﹑棕榈植物重要性状的分子标记﹑遗传图谱的构建等方面的应用。最后指出分子标记在棕榈植物育种中的应用前景。