科创中国

在中国农村物流发展现状及特点分析的基础上,对中国邮政发展农村物流分销模式进行了研究和探讨,总结出邮政农村分销的四大模式,并对分销模式的进一步推广实施提出了相关建议.

首先对物流配送及相关理论进行了综述,提出了共同配送模式在广西-东盟物流中的应用,同时,对广西现行的自营配送模式与共同配送模式进行了比较,并从成本、路线、经营主体等方面进行了定性、定量分析,由此,得出了自营配送模式存在成本高、路线不完善、经济主体单一等一系列问题,而共同配送模式更适合于广西物流发展的现状,并提出了共同配送的三种组织模式在广西物流应用中的优势和劣势.最后,提出了共同配送模式在广西物流配送应用中需要注意的问题及其对策.

论述了大型物流配送中心的基本构成,运营管理主要环节及要素,提出了提高大型物流配送中心运营管理效率和降低物流成本的主要方面和主要方法策略.

在介绍电子商务相关概念的基础上,对现有的几种电子商务物流配送模式进行了描述,并比较了不同模式的优劣势,最后对影响电子商务企业物流配送模式选择的因素进行了分析,结果表明电子商务企业在面临物流模式选择问题时,必须根据自身以及市场的发展现状,来选择适合企业长远发展的物流对策.

In the field of aerospace, high-speed trains and automobile, etc, analysis of temperature filed and scuffing failure of tapered roller bearings are more important than ever, and the scuffing failure of elements of such rolling bearings under heavy load and high speed still cannot be effectively predicted yet. A simplified model of tapered roller bearings consisted of one inner raceway, one outer raceway and a tapered roller was established, in which the interaction of several heat sources is ignored. The contact mechanics model, temperature model and model of scuffing failure are synthesized, and the corresponding computer programs are developed to analyze the effects of bearings parameters, different material and operational conditions on thermal performance of bearings, and temperature distribution and the possibility of surface scuffing are obtained. The results show that load, speed, thermal conductivity and tapered roller materials influence temperature rise and scuffing failure of bearings. Ceramic material of tapered roller results in the decrease of scuffing possibility of bearings to a high extent than the conventional rolling bearing steel. Compared with bulk temperature, flash temperature on the surfaces of bearing elements has a little influence on maximum temperature rise of bearing elements. For the rolling bearings operated under high speed and heavy load, this paper proposes a method which can accurately calculate the possibility of scuffing failure of rolling bearings.

分析了物流中心主要的管理活动,构造了一个能适应Internet环境的物流中心管理信息系统,并对系统中的几大主要模块做了进一步介绍.

促农增收及新农村建设作为国家及河南"十二五"发展重点内容,为郑州农业物流发展提供了良好的机遇,在这样的前提下,对郑州农业物流发展的战略机遇、郑州农业物流发展现状及存在问题进行总结,并提出相应解决问题的对策,以期对郑州农业物流的发展起到较好的促进作用,并为整个中原经济区建设打好基础.

It is a common phenomenon that the cracks originating from a hole can cause structural damage in engineering.However,the fracture mechanics studies of hole edge crack problems are not sufficient.The problem of an elliptical hole with two collinear edge cracks of unequal length in an infinite plate under uniform tension at infinity is investigated.Based on the complex variable method,the analytical solutions of stress functions and stress intensity factors are provided.The stress distribution along the axes and the edge of the elliptical hole is given graphically.The numerical results show that there is obvious stress concentration near the hole and cracks,and the stresses tend to applied loads at distances far from the defect,which conform to Saint-Venant's principle.Hence,the stress functions are proved to be right.Under special conditions,the present configuration becomes the Griffith crack,two symmetrical cracks emanating from an elliptical hole,two cracks of unequal length emanating from a circular hole,a crack at the edge of a circular hole,or a crack emanating from an elliptical hole.Compared with available results,stress intensity factors for these special shapes of ellipses and cracks show good coincidence.The stress intensity factor for two cracks of unequal length at the edge of an elliptical hole increases with the crack length and the major-to-minor axis ratio of the elliptical hole.The stress distribution in an infinite plate containing an elliptic hole with unsymmetrical cracks is given for the first time.

根据现代物流的发展,提出物流的物品、过程两个基本假设,沿着这两条主线,结合物流系统结构、实体物流表现、物流学科设置,理论联系实际分析了物流系统框架.

物流行业的飞速发展迫使物流公司有强烈的愿望通过上市进行资本融资,进而产生盈余管理的行为.首先对物流公司IPO过程中盈余管理的手段进行分析,进而又分析了其进行盈余管理的特点、识别方法及测度其盈余管理幅度的模型.