Comparative and Empirical Study on Vegetable Input-Output Efficiency of Suburban and Rural Areas

On the basis of comparative analysis on the vegetable input-output efficiency of suburban and rural areas in 2011- 2012,this paper made co-integration test,impulse response and variance decomposition for the vegetable input-output relationship of suburban areas in 1998-2012. Comparative analysis indicated that the vegetable input-output benefit of suburban area declines,while that of rural area rises; empirical analysis indicated that there is a long-term stable relationship between labor cost of vegetable planting and vegetable income and between material cost of vegetable planting and vegetable income,but the vegetable income itself has certain lag effect,followed by material cost,and the labor cost has minimum influence. Finally,it came up with recommendations for improving suburban vegetable input-output relationship,including improving vegetable input security mechanism,improving farmers' quality and innovation ability,and increasing technological input.

Research on the Basic Computer Application Learning Strategies in Rural Middle School

Fewer scholars in China fixed on the basic computer application learning strategies for rural students; in this paper,I want to discuss them for those students,and give them some helpful strategies to promote basic computer application learning in rural areas of China.

网格计算资源管理中的信誉度模型

网格资源管理作为网格研究的核心内容,受到研究人员的高度关注。目前已经提出的诸多管理模型中,基于计算经济的模型被人们普遍看好。文中针对计算经济模型,提出了资源信誉度、资源提供者信誉度、资源消费者信誉度的概念。在此基础上,深入研究了信誉度评价的评价模型和算法以及信誉度评价实现中的一些处理策略。对信誉度评价所需的资源使用记录进行了定义,根据评价需要对现有RUR进行了扩展。最后通过仿真实验对信誉度评价算法进行验证,得到了相应的实验结果和结论。

网格计算经济中的信誉度体系结构

针对网格资源管理中计算经济模型的资源信誉度、资源提供者信誉度和服务消费者信誉 度,提出并实现了信誉度评价体系结构以及信誉度评价中的一些处理策略。详细讨论了信誉度评价 的模块组成和实现模型,对信誉度评价所需的资源使用记录进行了定义,由此对RUR(ResourceUsage Record)基本组成的扩展进行了研究。最后通过仿真实验对信誉度评估体系完成了验证,证明体系结 构的设计和实现是有效的。

基于UML的网络远程教学系统设计分析

在当前的计算机软件设计中,大型软件系统基本上是采用面向对象方法来进行设计的,统一建模语言UML是面向对象分析和设计过程中重要的建模工具。此文以网上远程教学系统的开发为背景,对UML的建模机制作了系统的概括,研究了基于UML1的应用软件系统开发过程以及UML各图形之间的内在联系,介绍UML如何辅助完成用例建模、静态建模和动态建模。

单位根的全距检验方法及其应用

文章系统研究了单位根检验的一种非参数全距检验统计量:RUR检验与FB-RUR检验,并且运用Monte Carlo模拟给出了两个全距检验的临界值及响应面函数,MC仿真比较了全距检验与秩检验、传统检验的优劣。结果表明,全距检验统计量的检验效果与秩检验相近,适用于非线性时间序列平稳性检验。实证表明,当全距检验与秩检验结果一致但与传统检验不一致时,往往存在明显的单调非线性特征;当全距检验与秩检验、传统检验结果不一致时,序列会出现周期性、非线性或结构突变等多重特征。将全距检验、秩检验与传统单位根检验方法相结合可以发现时间序列中的非线性特征,从而防止对非线性时间序列滥用传统单位根检验得到错误的结论。

网格信任评价审计及控制

客观地评价资源是信任模型有效的基础,而评价的主观性则使其难以实现,审计成为维护评价客观性的重要方法。针对信任评价,提出了一个带有审计功能的评价模型,通过采集调度数据、标准化、距离计算、异常评价发现和评价修正等步骤,实现评价的审计和对评价的控制。讨论了审计周期,给出了审计算法。实验表明,所提出的方法对用户信任评价的审计是有效的,发现了评价中存在的问题并在后来的评价中加以修正,同时促进了系统的稳定性和吞吐量。

大城市郊区区县竞争力浅析

笔者从测定大城市郊区区县经济综合竞争力强弱的指标体系入手,将竞争力指标分为创造力指数、吸引力指数和持续发展指数三大类共17个指标。用加权平均法测算上海郊区各区县的竞争力指数并进行排名,对竞争力强弱与经济增长关系进行实证分析。最后提出,上海郊区各区县目前竞争态势良好,有利于共同发展,新一轮经济增长中各区县应理性竞争,通过合理的竞争达到区域经济增长最优化。提升区县竞争力的途径已发生明显的变化,从过去的区位优势等比较优势向政策环境、管理水平、政府职能、企业竞争实力等竞争优势转变。

城乡统筹背景下县域乡村建设规划编制思考——以山东省临沂市乡村建设规划实践为例

伴随着我国经济社会发展进入"新时期",城乡发展也呈现出新的特征和趋势。如何将因地制宜、生态优先、区域协同等理念贯彻到乡村建设规划中是目前亟需探索的问题。本文结合山东省临沂市乡村建设规划实践,通过现场调研、部门访谈和案例研究等方法,在反思乡村建设规划存在问题的基础上,探讨了临沂市乡村建设规划的编制特色、技术要点及其理论意义,总结出"三三四"模式,即抓好分区引导、底线控制和有机衔接三大环节,坚持村民导向、特色导向和产业导向三大导向,充分发挥规划龙头作用、示范带动作用、人才智库作用和监督实施作用等四大作用,从而推动临沂乡村建设规划的有序推进实施。

21世纪乡镇图书馆建设之我见

乡镇图书馆离农民最近,21世纪的乡镇图书馆在发展农业经济,提高农民整体素质方面大有用武之地。各级政府应重视乡镇图书馆建设。

基于农村沼气的生态循环种养技术示范

首先,介绍了沼气发酵多样化原料利用技术、高效沼气发酵技术以及生态循环种养技术;然后,以阜阳市颍东区典型规模化畜禽养殖场康乐养殖场为试点,集成沼气发酵多样化原料利用技术和高效沼气发酵技术,进行生态循环种养技术示范,并分析实施效果。结果表明,该项目的实施不仅促进了农村沼气的可持续发展,提高了示范区农民的收入水平,而且有效防治了农业面源污染,改善了农村生态环境,取得了良好的经济、社会和生态效益。

睢宁黄河故道沿线区域土地利用变化特征与人文驱动力研究

研究目的:研究睢宁黄河故道沿线区域土地利用变化人文驱动力,分析主要驱动因素,为该地区土地开发整理提供可靠信息,为政府管理决策提供依据。研究方法:根据1992-2002年该地区土地利用变化数据,采用相关分析的方法。研究结果:促使该区域土地利用变化的主要的人文驱动力因素是人口增长、农村产业结构调整和国家开发投资。研究结论:要改变故道地区落后的现状,应该控制人口的增长,合理调整农村产业结构,加快城市化进程,同时国家要加大对该地区的投资,进行合理的规划和开发整理。

从贞岱村的景观设计展望我们的新农村建设

厦门市政府对全市大多数旧村进行了改造和新村建设,使村容村貌发生了根本性变化,基本实现了布局优化、道路硬化、村庄绿化、路灯亮化、卫生洁化、环境美化的目标。本工程便是厦门海沧地区的一个典型的"农城化"改造项目。

瑞赣高速公路路侧安全研究

路侧安全对道路安全具有重要意义。通过对国内外现有路侧安全研究成果的分析,结合瑞赣高速公路和江西省实际情况,分别在设计和施工方面提出了一系列措施最大程度上保证了路侧安全。

Decomposing the Radicals of Polynomial Ideals by Rational Univariate Representations

In this paper,the notion of rational univariate representations with variables is introduced.Consequently,the ideals,created by given rational univariate representations with variables,are defined.One merit of these created ideals is that some of their algebraic properties can be easily decided.With the aid of the theory of valuations,some related results are established.Based on these results,a new approach is presented for decomposing the radical of a polynomial ideal into an intersection of prime ideals.

The Invertibility of Rational Univariate Representations

In this paper,the so-called invertibility is introduced for rational univariate representations,and a characterization of the invertibility is given.It is shown that the rational univariate representations,obtained by both Rouillier’s approach and Wu’s method,are invertible.Moreover,the ideal created by a given rational univariate representation is defined.Some results on invertible rational univariate representations and created ideals are established.Based on these results,a new approach is presented for decomposing the radical of a zero-dimensional polynomial ideal into an intersection of maximal ideals.

Legislation of Urban Planning Public Policy from the Perspective of Legal Boundary: Enlightenment from the Evolution of Planning Laws

The transition of urban-rural planning to public policy has become a common recognition in the planning fi eld. The new challenge is how to combine such a transition with legislation development. This paper reviews the disciplinary development and legislation of urban-rural planning, and analyzes the effects of the public policy transition on law implementation and administrative power from the perspective of the legal boundary. It points out that the defi nition of the legal boundary of urban-rural planning laws is signifi cant for identifying the impact of public policy, ensuring the implementation of regulations on administrative power, and scoping effective urban-rural spaces. It argues that the core of public policy legalization is to establish value judgments for public policy making, to specify authorization and restraint to administrative power, and to reduce confl icts between public policies and governments' administrative actions in urban-rural spaces. Furthermore, this paper discusses some other relevant issues on how to complete the public policy legalization.

Computing polynomial univariate representations of zero-dimensional ideals by Grbner basis

Rational Univariate Representation(RUR) of zero-dimensional ideals is used to describe the zeros of zero-dimensional ideals and RUR has been studied extensively.In 1999,Roullier proposed an efficient algorithm to compute RUR of zero-dimensional ideals.In this paper,we will present a new algorithm to compute Polynomial Univariate Representation(PUR) of zero-dimensional ideals.The new algorithm is based on some interesting properties of Grbner basis.The new algorithm also provides a method for testing separating elements.

Determination of the limits for multivariate rational functions

The purpose of this paper is to solve the problem of determining the limits of multivariate rational functions.It is essential to decide whether or not limxˉ→0f g=0 for two non-zero polynomials f,g∈R[x1,...,xn]with f(0,...,0)=g(0,...,0)=0.For two such polynomials f and g,we establish two necessary and sufcient conditions for the rational functionf g to have its limit 0 at the origin.Based on these theoretic results,we present an algorithm for deciding whether or not lim(x1,...,xn)→(0,...,0)f g=0,where f,g∈R[x1,...,xn]are two non-zero polynomials.The design of our algorithm involves two existing algorithms:one for computing the rational univariate representations of a complete chain of polynomials,another for catching strictly critical points in a real algebraic variety.The two algorithms are based on the well-known Wu’s method.With the aid of the computer algebraic system Maple,our algorithm has been made into a general program.In the final section of this paper,several examples are given to illustrate the efectiveness of our algorithm.

SEMI-ALGEBRAICALLY CONNECTED COMPONENTS OF MINIMUM POINTS OF A POLYNOMIAL FUNCTION

In a recent article,the authors provided an effective algorithm for both computing the global infimum of / and deciding whether or not the infimum of / is attained,where / is a multivariate polynomial over the field R of real numbers.As a complement,the authors investigate the semialgebraically connected components of minimum points of a polynomial function in this paper.For a given multivariate polynomial / over R,it is shown that the above-mentioned algorithm can find at least one point in each semi-algebraically connected component of minimum points of / whenever /has its global minimum.