开口薄壁结构弯扭屈曲能量原理的有限变形理论分析

The formulas of the total potential energy of arbitrary thin- walled open cross section member counting in the geometric non-linear factors is deduced. The deductions are based on the most general finite deformation theory and the two assumptions that"the     

南海资源开发战略的国际经验比较与借鉴

众所周知,21世纪是海洋的世纪,发展海洋经济将成为世界各国的重要战略目标之一。南海作为中国海域面积最大、资源最丰富的外海,也将成为我国打造海洋强国战略目标的核心海域。而因其独特的区位因素和丰富的油气资源,引起了东南亚沿岸各国间的相互争夺,从而形成了"六国七方"的混乱局面。本文从主权争议,岛屿归属,南海资源开发(渔业资源开发,油气开采)等方面出发,研究我国南海资源开发过程中所面临的具体问题,并借鉴美、英、日、韩等国经验,寻求一种综合性解决南海资源开发的办法。     

AN APPRONTMATE CALCULATING METHOD FOR WALL PLATES OF MAN'' S DRY GAS HOLDERS

The basic equations of wall plates of MAN' S dry gas holders are derived in this paper. According to the law of cylindrical bending given by the finite element results .we derive some approximate formula calculating the deflection and stresses of the wall plates from the basic equations. Compared with the known approximate calculating method.the method car. obviously increase the percision.     

新陈代谢GM(1,1)模型在兵团农机总动力预测中的应用

借助灰色系统理论,利用兵团农机总动力的历史数据,建立并对比分析了GM(1,1)模型和新陈代谢GM(1,1),对兵团农业机械总动力进行预测,为以后兵团农业机械化的发展提供一定的参考。     

穴盘播种控制器中的多任务分析与实现

在穴盘播种控制器的软件系统开发时，通过对穴盘播种控制器中存在的任务进行分析，运用实时系统前后台编程方式，合理使用单片机的中断系统，进行了播种器的控制软件设计。最后对软件性能进行了分析。经实际运行结果表明，该软件系统可以很好地满足播种器的实际工作要求。     

China's alfalfa market and imports: Development,trends, and potential impacts of the U.S.–China trade dispute and retaliations

This study examines the development and trends of China's alfalfa market and imports, identifies key factors for the rapid increase in China's alfalfa imports, and discusses potential impacts of the U.S.–China trade dispute and retaliations on the alfalfa markets and trade in both nations. China's rapid transition toward larger-scale commercial dairy production, with enhanced feed and cost management as well as quality and safety control, and its limited resources for high-quality alfalfa production are key factors for the dramatic increase in its alfalfa imports, from 19 601 metric tons in 2008 to 1.38 million metric tons (mmt) in 2018. While the United States dominated China's alfalfa imports with an average share of 97.01% from 2007 to 2017, the share dropped to 83.76% in 2018 and 63.28% in January 2019 due to the trade dispute and retaliations started in 2018. China will likely remain a large importer of alfalfa because of both its growing demand and the comparative advantages of imported alfalfa in quality and price, but the imports from the United States will be highly affected by the ongoing trade dispute and negotiations. China is also expected to make more efforts to reduce its dependence on U.S. alfalfa through increased investment in domestic alfalfa production and identification of alternative sources of alfalfa and other hay imports.     

退耕坡地系统生态综合评价中几个景观生态学问题

退耕坡地系统属于退化土地生态系统,大部分是毁林(草)开荒形成的,是人为加速了自然生态系统的逆行演替而形成的低产脆弱的生态系统。对退化生态系统进行综合整治与恢复,以及人工生态系统的重建的理论基础是生态演替和人为设计理论。退耕还林(草)是通过一定的社会物质和能量的投入定向加速景观生态系统的演替过程。评价退耕地的生态经济效益是退耕还林(草)工程的重要组成部分,重点评定项目是否实现预期目标、项目的产出、效果和影响。本文应用景观生态学的理论:景观尺度与等级理论、景观空间格局与异质性理论、景观演化与干扰理论探讨了退耕地生态评价的内容、方法和应注意的问题,从而为退耕还林(草)工程的顺利进行提供有力的保障。     

浅谈纽马克的翻译理论及其在标题翻译中的应用

语义翻译和交际翻译以及文本范畴理论是纽马克翻译理论的核心内容，它为翻译实践提供了新的视角。标题作为一部作品的重要组成部分，在翻译时，如果灵活应用了纽马克的翻译理论，特别是语义翻译／交际翻译，译文标题一定会贴切、生动、突出，更好地发挥其吸引目标群体的功能。本文以四类典型标题的翻译为例，通过不同案例的对比、分析，探讨了纽马克翻译理论在标题翻译中的功用和妙用。     

WTO争端解决机制执行程序研究

《关于争端解决规则与程序的谅解》(以下简称《谅解》或DSU)对执行程序规定了明确的时间界限,通过监督机制、补偿程序、报复程序,尤其是交叉报复程序加大了DSB裁决的执行力度。但DSU也有其缺陷:合理期间被恶意使用,执行监督程序规则过于简单,交叉报复对发展中国家欠公平。应建立集体报复制度、惩罚制度,完善执行监督程序,尤其是给予发展中国家的特殊待遇条款应具有可操作性。     

我国农村纠纷多元化解决机制探析

多元化纠纷解决机制是我国重要的社会治理方式,在解决农村矛盾纠纷的过程中发挥着不可替代的作用。多元化纠纷解决机制能够在我国广大的农村地区存在并发展,因其有着重要的现实基础。目前,多元化纠纷解决机制在司法的权威和公信力、各纠纷解决机制关系和功能发挥等方面存在诸多问题,严重制约了多元化纠纷解决机制的作用在农村的发挥。因此,有必要在坚持多元化与利益协调理念相统一、人本与保护农民权益理念相统一、法治和自治理念相统一的前提下,从不同的方面对我国现行多元化纠纷解决机制予以完善。