Optimal pest control in agriculture

Based on economic methodology we model an ecosystem with two species in predator–prey relationship: mice feed on grain and grain feeds on a resource. With optimizing behavior of individual organisms a short-run ecosystem equilibrium is defined and characterized that depends on the farmer's use of fertilizer and pesticide and on the mice population which, in turn, is affected by pesticides. In that way, a microfounded agricultural production function is derived. Linking a sequence of short-run ecosystem equilibria yields the growth function of the mice population which is thus derived rather than assumed. In each period the farmer harvests all grain in excess of some given amount of seed. If she maximizes her present-value profits, optimal farming is characterized by either using no pesticide or a moderate amount of pesticide or by applying a chattering control. Pest eradication is never optimal. On the other hand, if the farmer takes into account steady-state mice populations only, it may be optimal to eradicate mice or to use no or a moderate amount of pesticide depending on prices as well as on the shape of the grain production function which is determined by microparameters of grain reproduction.     

Distribution-free tests for comparing several treatments with a control

Abstract  In this paper we propose distribution-free treatments versus control tests for the one- and two-way classifications. The null distribution properties are shown to be equivalent to those of well-known statistics for which critical values have been extensively tabled. Asymptotic relative efficiencies with respect to corresponding normal theory competitors are derived and optimal designs for the allocation of experimental units to the treatments and control are obtained.     

The housing question in Japan

This article first examines how bad housing conditions are in Japan based on international comparisons. The next question is whether the extremely high land prices in Japan can be explained by economic logic. We then turn to more specific housing policy questions that are peculiar to or important in Japan, such as the tax advantages of owning land that have caused under-utilization of land and the reasons why the average size of Japanese rental housing is so small.     

建筑外墙氟碳涂料施工的质量监控

建筑外墙氟碳涂料克服了以往氟碳涂料不能常温固化的缺点，能应用于混凝土等无机材质的表面。由于其具有超耐候性等卓越性能，已受到业主、设计的关注和市场的认可，在外墙饰面中将得到广泛应用。文章浅析了外墙氟碳涂料的材料特性，阐述了外墙氟碳涂料施工阶段的质量事前控制、事中控制和事后控制；对某工程外墙氟碳涂料施工质量缺陷产生的原因进行了分析，提出了相应的预控措施。     

经济生产量模型对库存的控制

在分析需求变化的基础上修改和完善了经济批量模型,进一步研究了单项物品和多项物品的最小经济生产批量以及年最小总成本,改进了经济生产量模型。     

倒排计划和安全库存计划相结合的物料需求计划与控制方法--用于非定型产品制造业

介绍生产非定型产品企业的物料需求计划与控制的原则，根据制造业企业的物料整体逻辑流程图，找出影响物料需求计划与控制的各个因素，提出合理实效的需求计划与控制方法并以实例加以说明。     

浅论制造业供应链质量管理

从质量链管理产生的背景出发，提出制造业企业应由重视产品质量和服务质量，进一步提升为重视和改进整个经营管理的质量，追求卓越的供应链质量管理观念。     

小型物资保障体系的构建分析

分析了小型物资保障体系的形态架构及其物流驱动与管理结构，介绍了库存控制的三种基本方法和仓储管理应注意的问题。     

网络环境下物流企业实行零基预算管理模式研究

费用预算是物流企业成长管理的一项重要内容，利用网络技术为企业构筑的管理平台，编制切实可行的费用预算，对于约束和控制费用的发生，降低物流企业成本具有重要作用。