古代中国地理环境的特征及其变迁对食品生产的影响

详细介绍了古代中国不同时期森林、草原、耕地、湖泊水源、气候的地理环境的特点及其变迁,并且介绍了自先秦时期、秦汉、魏晋隋唐、宋元明清以来地理环境的变迁及对食品生产种类、耕作方式、主粮地位、食品生产重心、农牧业比例等产生的影响,还介绍了不同阶段的食品生产呈现的不同特征.     

Future of the animal health industry at a time of food crisis

It is popular in some quarters to say that there is no food crisis; that there is food aplenty; and that the problem is one of distribution or other over-arching technical difficulty. To the starving, however, there is a food crisis; and it neither speaks well nor bodes well for humanity if we dismiss their plight so glibly. The United Nations has called for a large and rapid increase in food production. Veterinary parasitologists and industry leaders can contribute to the production of healthier livestock and the expansion of aquaculture, but enhanced production and better delivery of plant foods may provide faster relief. Although livestock farming is not the most energy-efficient way of producing food, meat will remain a significant component of the global diet for the foreseeable future. New measures for parasite control will be needed, and we must improve our methods of inventing them. They need not act directly against the parasite. In the distant future lie other threats to the inhabitants of planet Earth, and here we must acknowledge the cogency of the no-food-crisis argument. In the long term, the production of animal foods and animal feeds will be revamped in ways that depend on how (or whether) we solve the energy crisis, the environmental crisis, the increasingly dire regional population crises, and the current world financial crisis. Throughout the 20th century, the animal health industry had to adapt to industrialization and expansive agribusiness. It will have to adapt to even greater changes in the 21st century and beyond.     

便携式林业机械(油锯)及其作业中的人类工效学

该文论述了油锯作业的安全问题及其与人体疲劳的关系．从人体生理学和人类工效学的角度概述了人体疲劳的研究情况．高强度的工作负荷是油锯作业人体疲劳的主要原因．文章最后提出对油锯及其作业进行合理的人类工效学设计是降低油锯工作负荷，减轻作业疲劳的有效方法．     

基于价值链理论的精准农业技术构成

提出了运用价值链理论分析农业生产增值环节的基本思路。在分析精准农业技术应用过程中遇到的诸如设备昂贵、技术缺乏、地块偏小、风险偏大和基础设施不健全等矛盾的基础上,构建了以信息网络技术为依托的囊括产前、产中、产后等环节的精准农业价值链模型。在遵循市场需求和实用性原则的前提下,提出了以高级技术引导、特色技术示范和初级技术为推广重点,辅以完善的基础设施技术和先进管理技术的精准农业技术构成体系,以促进农民增收和农业增效为目的,加快我国精准农业技术"本地化"的步伐,使传统农业逐步向现代农业转变。     

Bayesian analysis of complex traits in pedigreed plant populations

A Bayesian approach to analyze complex traits is presented that can help plant eneticists and breeders in exploiting the marker and phenotypic data on pedigreed populations as available from ongoing breeding programs. The statistical model for the quantitative trait may include non-genetic and genetic components. The latter component can be divided into QTL on known marker linkage groups, major genes and a polygenic component. The full probability model, prior assumptions on model variables are presented and criterion for model selection and posterior inferences are given. Simulated data on a known pedigreed population structure of the EU project HiDRAS was used to illustrate the use of the Bayesian approach to analyze complex traits. It was shown that estimates for QTL parameters were more accurate when non-genetic factors were included in the model and when a polygenic component was included when not all linkage groups were analyzed simultaneously. The Bayesian approach has been implemented into the software package FlexQTL and allows plant breeders explore their pedigreed populations for segregating QTL alleles that are relevant in their breeding program.     

CAN节点的可靠性分析

为了提高CAN系统可靠性和容错能力,避免整个网路充满虚假的错误信息或者不必要的重发,CAN协议采用故障界定机制去判别硬件错误剔除错误节点,本文首先介绍了离散马尔可夫链分析,它可简单而清楚的说明分析影响平均"总线关闭"时间的因素,然后分析了CAN协议采用故障界定机制,最后给出一个采用马尔可夫链来分析平均"总线关闭"时间的实例。实例表明一个CAN节点的平均"总线关闭hitting"时间取决于其数据帧的长度。     

基于供应链管理的钢铁企业ERP实施

供应链管理已经发展成为一种先进的管理模式,它不仅带来了新的管理理念,而且为企业之间的信息沟通和交流、创建集成的业务流程环境提供了原动力.从钢铁企业实施ERP的背景着手,通过对钢铁企业物流现状的分析,提出了钢铁企业具体实施ERP的策略,阐明了钢铁企业实施ERP的意义.     

农资连锁企业信息管理存在的问题及其对策研究

分析了农资连锁企业信息管理现状,并针对农资连锁企业信息管理存在的问题提出对策建议。     

我国农业生产企业融资模式研究——基于供应链金融视角

农业生产企业融资难一直是困扰企业发展、制约农业现代化发展的瓶颈问题,供应链金融的发展和应用为这一问题的有效解决提供新的途径。本文主要以农业生产企业融资模式为研究对象,运用案例分析方法,对供应链上游内部融资模式、订单融资模式、应收账款融资模式和第三方物流参与下的供应链金融融资模式等进行研究,分析探讨不同融资模式的基本特征,运用系统动力学方法开展仿真分析。研究发现:市场价格、进货价格、质押率、手续费率和利率等因素会不同程度影响供应链融资的绩效,选择适宜的比率将有利于得到最优化的供应链。同时基于研究结论提出了优化完善农业供应链金融的有关政策建议。     

基于信用提升来解决食品安全问题的探讨

基于食品安全频发的现状,深入分析食品安全问题产生的原因,主要是一线人员意识薄弱漠视生命安全、食品生产经营者过度追逐利益、行政监督监管缺位滞后和缺乏诚信公心的社会文化4个方面的原因,并针对这4个方面,从改善信用状况角度,提出了相应的对策建议。