漂移瑞利滤波算法及其在纯方位跟踪中的应用

关联交易资金占用行为通常被视作大股东对上市公司的掏空而出现在诸多文献当中。但是从企业集团内部资本市场资源配置的视角来分析，这种行为可能是出于提高企业集团资金使用效率的目的。利用我国A股上市公司2009~2011年度的关联交易数据，对我国上市公司关联交易资金占用情况与上市公司面临的融资约束、经营不确定性之间的关系进行了实证检验，结果支持了关联交易资金占用行为的企业集团内部资本市场资源配置假说。     

中国知识密集型电子商务发展的制约因素分析

结合中国社会的实际情况,电子商务作为知识密集型服务,其发展之制约因素分为外部和内部两类,本文深入剖析电子商务发展中国内环境、电子商务业务中个人消费者、传统企业以及电子商务企业存在的知识管理方面的弊端,以引发相关部门、企业及个人的思考.     

中国知识密集型电子商务发展的制约因素分析

结合中国社会的实际情况，电子商务作为知识密集型服务，其发展之制约因素分为外部和内部两类，本文深入剖析电子商务发展中国内环境、电子商务业务中个人消费者、传统企业以及电子商务企业存在的知识管理方面的弊端，以引发相关部门、企业及个人的思考。     

都兰县枸杞产业发展存在的问题与对策

摘要：文章主要阐述了目前都兰县枸杞产业发展过程中存在的问题和制约因素，并提出需要解决和提升的关键技术。     

Constraints and possibilities for developing aquaculture

World aquaculture production in 1990 reached some 15 million tonnes, and predictions indicate that future production will reach 19.6 million tonnes by 2000, 37.5 million tonnes by 2010, and 62.4 million tonnes by 2025. Meanwhile, world fisheries production from capture will remain stable at about 100 million tonnes. Thus, all future increase in seafood supplies will have to come from aquaculture.Possibilities for development of aquaculture exist in a number of areas around the world. Technology and natural conditions determine the choice of sites and species to be produced, but current research indicates that a number of new species will be added to the present aquaculture production in the coming years. However, well-known species such as carp, tilapia, trout, salmon, turbot, halibut, cod, and sturgeon will be the most important in the immediate future. Among the crustaceans, shrimp will continue to be an important item, as will various kinds of gastropods and bivalves.Regions with a particular suitability for development of aquaculture include Africa, Asia, and Latin America. Freshwater aquaculture may also be developed on a larger scale in the former Eastern European countries, including the former Soviet Union, but here (and in Africa), political and economic constraints will slow down development for the next decade. A major constraint for development of aquaculture in Africa is the lack of infrastructure, as well as political problems, slow or deficient bureaucracies, and to some extent pollution. In Eastern Europe, development will be hindered by the lack of capital, and uncertainty about the political and economic development. Eastern Europe also has a major environmental problem, which may limit growth within this field. In Asia, space and availability of suitable sites are becoming a problem, as are pollution, diseases, and in some cases overproduction.A general constraint to global development of aquaculture may be price fluctuations, which affect the investment willingness of interested investors. This question must be seen in connection with the economics of operation. As new species are being launched, there is usually a short period of high profits, followed by a period of price reductions, and the collapse of several operators. After such turbulence, serious operators with proper management survive, and go on to operate a reasonably profitable business. The mechanism seems to be true for all new business areas, and does create a problem for sustained investor interest in aquaculture development.     

关于打造农业精品期刊的思考

详细分析了制约农业精品期刊产生的主要因素,提出通过采取树立品牌意识,明确刊物定位,突出办刊特色,打造一支高素质复合型的人才队伍,发展集团化经营等系列措施,打造农业精品期刊。     

关于打造农业精品期刊的思考

详细分析了制约农业精品期刊产生的主要因素,提出通过采取树立品牌意识,明确刊物定位,突出办刊特色,打造一支高素质复合型的人才队伍,发展集团化经营等系列措施,打造农业精品期刊。     

我国北方枣产业发展的制约因素分析

分析了影响我国北方枣产业发展的众多因素,利用解释结构模型(ISM),寻求制约其发展的根本因素,并从政府宏观调控、枣农组织化建设及自然灾害的应对3个方面提出有针对性的解决对策。     

新型农业经营主体开展农产品电子商务的现状及问题探析

文章首先对家庭农场（专业大户）、农民专业合作社以及农业产业化龙头企业等新型农业经营主体开展农产品电子商务现状进行梳理,归纳总结了各类主体开展农产品电子商务的特点以及采用的电子商务模式。其次,从客观条件和主观意识2个方面,分析了制约新型农业经营主体开展农产品电子商务的关键因素。最后,从政府管理层面和新型农业经营主体层面分别提出了促进农产品电子商务采纳的对策建议,即在政府管理层面,要从人才培养、智慧物流、精准施政、第三方服务等方面扫清障碍;在新型农业经营主体层面,提倡品牌定位精准化、生产流程标准化、生产过程可视化、营销模式多元化、产品包装规格化,充分发挥新型农业经营主体在推动农产品电子商务发展和农业现代化建设中的示范引领作用。     

Integrated approach for improving small scale market oriented dairy systems in Pakistan: participatory rural appraisal and economic opportunity survey

Livestock production is an integral part of the rain-fed and irrigated agriculture system in Pakistan. Animal production is closely interlinked with the cropping systems and play a crucial role in the rural economy. Participatory rural appraisals and economic opportunity surveys were conducted in two ecological zones (irrigated and rain-fed) and two dairy production systems (peri-urban and mixed livestock). Major constraints in animal health, nutrition and reproduction were identified and interventions were suggested to overcome these difficulties. The economic opportunity survey revealed that maximum opportunity to enhance farmers’ income is to increase milk production per day per animal, which can be accomplished through coordinated improvements in nutrition, reproduction and genetics.