Adaptive Filtering Algorithm to GPS/INS Integrated System

GPS/INS integrated systems are applied in the self-positioning of the high dynamic targets. This paper forms state equations and observation equations by the integrated system and GPS observation respectively. An adaptive filtering algorithm is introduced which estimates observation noise covariance with observation data, and estimates dynamic noise covariance by use of Sage-Husa filtering algorithm which has faster convergent speed and better stability than the conventional Kalman filtering algorithm. At last, simulations are given to verify the effectiveness of the algorithm.     

Federated Kalman Filter for GPS/DR Integrated Navigation Systems in Land Vehicle

GPS/DR is a low-cost and high-reliability navigation facility. A federated Kalman filter was designed to real- ize the optimal synthesis of GPS/DR integrated land vehicle navigation system, and its algorithm is presented. A field test was performed. The theoretical analysis and the experiment results both show that, by using this federated Kahnan filter, the positioning accuracy and fault tolerance capability of the GPS/DR integrated navigation system can be greatly improved.     

FEM on Coupled Hydromechanical Dynamic Response of Geogrid Reinforced Soil Retaining Wall

Geogrid reinforced soil retaining wall(GRSRW) is composed of panel,geogrid and soil,its coupled hydromechanical structural characteristics are increasingly emphasized in practice.In this paper,based on the characteristics of the reinforcement-soil interaction,the grogrid and soil around it with a definite thickness were regarded as a kind of composite material with strain-compatible condition.A saturated porous media model was introduced to simulate the soil and reinforcement-soil composite material hereby and the mathematic model for numerical analysis on structural characteristics of GRSRW was built up.The FEM equations were deduced from the standard Galerkin procedure,resolving these equations,we can gain the relevant dynamic response of saturated GRSRW.     

基于双模定位的冷链物流实时监测系统

为加强冷链物流监管,实现冷链物流的全程温度和定位监测,设计了基于双模定位的冷链物流实时监测系统。本系统除了集成嵌入式技术、卫星定位技术和GPRS无线通信技术等以实现温度采集、数据远程传输和定位等功能,还使用融合数据的双模定位取代单GPS定位以提高复杂环境下的定位精度,并提出使用改进的扩展卡尔曼滤波算法进行定位解算以实现双系统下定位数据融合,在静态时对水平精度和三维精度分别提高了37.5%和28.6%。测试结果表明,本系统提高了冷链物流监测能力,为未来研究冷链无人配送的定位问题提供基础。     

Research on Design Methods for Reinforced Earth Retaining Wall with Cohesive Backfill

For the stability analysis of the reinforced earth retaining wall with cohesive backfill, this paper assumes that the state of failure surface is circular sliding surface and the bearing capacity is straight line relation with capacity and length of the reinforcement strip. These formulas agree with actual state of the reinforced earth retaining wall with cohesive backfill and result in saving reinforcement material in the design.     

Transient Simulation of Steam-turbine Generator Based on Time-domain

For achieving the high-fidelity simulation of steam-turbine generator on the real-time simulator of coal fired plant, the paper establishs a group of state equations based on Parkg equation, which can accurately describe its transient process. Then a kind of time-saved numerical solution in terms of four-order Runge-Kutta method is proposed through the modified processing to the time-dependent system matrix A and control matrix B. Finally a program is coded to simulate the emergency load process of one 360MW steam-turbine generator, the result indicates that the method of this paper can exactly apply on the generator model of real-time simulator.     

THE INSERTING SYNTHETICAL METHOD FOR COMPILING NETWORK STATE EQUATION

This paper begins with the analysis of factors affecting the esta-blishmet of network state equations. On the basis of characteristics of networkclement, a rational formntation order of elements as twigs and links is proved.According to the order, a best tree can be drawn, which is helpful to for-mulate state equations, Two examples are enumerated On the basis of the besttree, topological equations of network are written. By inserting operationswith both topological equations and characteristic formulas, a standard stateequation is derived as a result of eliminating the undesired variables. Thismethod is simpler and more convenient as compared with the others in theand has advantage of both the topological method and the direct operations,method.     

不同基质对大岩桐移栽成活率的影响研究

本文研究了不同基质上大岩桐组培苗的移栽成活率情况及生长健壮度。结果表明,质地疏松,保水保肥性好,且本身富含有机质的松针土是最适宜于大岩桐成活的基质,成活率可达91.7%,1：1的松针土和蛭石次之,成活率为80%,1：1的草炭和河沙最小为57%。这些结果对指导大岩桐组培快繁具有重要参考价值。     

稀土元素对植物生物学作用机制的研究进展

稀土元素在农业上得到了广泛的应用,产生了显著的经济效益。人们对稀土元素生物学效应的作用机制进行了很多研究,提出了许多论点。从稀土元素在植物体内的赋存、稀土元素对植物光合作用的影响机制、稀土元素对细胞中Ca的竞争取代机制、稀土元素对生物体内自由基的清除机制和稀土与生物大分子的紧密结合及在细胞水平的定位五个方面综合分析了稀土元素对于植物体作用机制的最新研究成果,为稀土农用技术的研究提供新的思路。     

EQUIVALENT-UNIT METHOD OF SHORT-TERM RELIABILITY EVALUATION FOR INTERCONNECTED POWER SYSTEMS

This paper presents the concept of equivalent-unit and the solution method of state probabilities for short-term reliability evaluation for generation systems. The ideas and methods are applied to evaluate short-term reliability of intercommected power systems,and the models of equivalent assistance,which can be conveniently combined with subsystem models,are propesed. The models and algorithm proposed not only solve the difficult problem of "state explosion" , but also improve the calculating accuracy. A numerical example is given to show that the models and algorithm are feasible and effective.     

Exploring integrated crop–livestock systems in different ecoregions of the United States

Large-scale, energy-intensive, specialized production systems have dominated agricultural production in the United States for the past half-century. Although highly productive and economically successful, there is increasing concern with unintended negative environmental impacts of current agricultural systems. Production systems integrating crops and livestock have potential for providing additional ecosystem services from agriculture by capturing positive ecological interactions and avoiding negative environmental outcomes, while sustaining profitability. A diversity of ecologically sound integrated crop-livestock systems have been and can be employed in different ecoregions: sod-based crop rotations, grazing cover crops in cash-crop rotations, crop residue grazing, sod intercropping, dual-purpose cereal crops, and agroforestry/silvopasture. Improved technologies in conservation tillage, weed control, fertilization, fencing, and planting, as well as improved plant genetics offer opportunities to facilitate successful adoption of integrated systems. This paper explores the use and potential of integrated crop-livestock systems in achieving environmental stewardship and maintaining profitability under a diversity of ecological conditions in the United States.     

THE ELIMINATION OF UNDETERMINED MULTIPLIERS OF MOTION EQUATIONS OF NONHOLONOMIC SYSTEMS

This paper studies several kinds of motion equations of nonlinear nonholonomic constraint systems. On the basis of the motion equations of the first order nonholonomic system and the theory of the zero factor of matrix multiplying from the left, the general equations of the system without undetermined multipliers is derived. By applying the method to arbitrary order nonholonomic systems, the motion equations of the systems are gained.     

Successive Approximation by Cascade Auto Disturbance Rejection Controller

An algorithm of parameter identification by model compensation auto disturbance rejection controller is given. It is very efficient to the parameter identification problems of low order systems. At the same time it is not easy to get satisfying parameters of the extended state observer when the order of the controlled system is high. To solve the above problem, we combine in this paper the auto disturbance rejection controller constructed by cascade extended state observer(CESO) with the algorithm of successive approximation. Simulations show it can identify the parameter of systems with known structure effectively. In the meantime, the parameters of CESO are much easier to adjust than those of the former ESO when it is applied to high order systems.     

Shifting subjects of health-care: placing "medical tourism" in the context of Malaysian domestic health-care reform

"Medical tourism" has frequently been held to unsettle naturalised relationships between the state and its citizenry. Yet in casting "medical tourism" as either an outside "innovation" or "invasion," scholars have often ignored the role that the neoliberal retrenchment of social welfare structures has played in shaping the domestic health-care systems of the "developing" countries recognised as international medical travel destinations. While there is little doubt that "medical tourism" impacts destinations' health-care systems, it remains essential to contextualise them. This paper offers a reading of the emergence of "medical tourism" from within the context of ongoing health-care privatisation reform in one of today's most prominent destinations: Malaysia. It argues that "medical tourism" to Malaysia has been mobilised politically both to advance domestic health-care reform and to cast off the country's "underdeveloped" image not only among foreign patient-consumers but also among its own nationals, who are themselves increasingly envisioned by the Malaysian state as prospective health-care consumers.     

A New Systematic Approach for Building State Equations

In this paper, the concept of hybrid variables is introduced. First hybrid equations are built and then,state equations are obtained by eliminating the redundant hybrid variables in the hybrid equations.     

中国北方地区花生栽培技术的研究进展

花生属地上开花地下结果的少数作物,其栽培条件对其产量影响尤为显著。花生新品种对产量的贡献率占20%—30%左右,而栽培技术对产量的贡献率达70%左右。随着种植制度的变革和市场发展的需求,花生栽培技术研究取得了较大进展。本文总结了近50年来北方区花生栽培技术的主要研究成果,目的在于为花生生产的发展和栽培技术的研究提供参考。     

Around Body Flow Computation with Vortex-Flow-streamFunction in Boundary Fitted Coordinates

In this paper, partial differential equations of vortex flow-stream function in boundary fitted coordinates and related ADI equations were listed. The flow around a cylinder in quadrilateral area by auto control boundary was computed. The diagram of distribution of speed arrow, constant lines of flow-stream function, vortex, two speed parts and pressure were studied.     

湖北蔬菜无公害标准化生产的制约因素及对策

阐述了湖北蔬菜实行无公害标准化生产的必要性,通过深入到湖北省蔬菜生产和销售的第一线就其无公害标准化生产等方面的问题进行了调查研究,综合分析湖北蔬菜实行无公害标准化生产的制约因素。结果认为,主要存在着无公害标准化生产和消费的社会意识和氛围不浓、蔬菜“优质优价”的市场机制还未建立、蔬菜质量的监督检测机制尚未形成、蔬菜无公害标准化生产的推广服务体系尚未建立、湖北蔬菜生产规模小等五个方面的制约因素。并就如何实行无公害标准化生产问题提出了相应的对策。     

基于Google Earth的二次开发在农场管理系统的应用研究

Google Earth 是一个卫星影像浏览软件,它采用“虚拟地球”的方式,提供多种分辨率的全球影像数据。自05年问世以来,它的使用群体越来越多,在许多应用领域中都可以把它作为一个工具软件和开发平台。本文通过面向对象的编程语言,探讨了基于Google Earth的二次开发构造的具体步骤与方法,为利用Google Earth来构建农场GIS系统提出了一种新的思路与方法。     

基于DEA的黑土地水土保持综合效益评价研究——以黑龙江省为例

从2003年,国家相继实施了多项黑土地水土保持工程,有必要对这些项目的实施效果进行评价。运用DEA模型,对黑龙江省近10年黑土地水土保持综合效益进行评价,分别得出经济效益、社会效益和生态效益的综合有效性、技术有效性和规模有效性,结果表明：黑龙江省黑土地水土保持工程综合效益较好且年度平稳度高,但还没有达到最优状态,针对评价结果,提出增加农民收入、优化资源配置等建议。