关于高职院校教育科研的现状调查与对策研究

针对当前高职院校的教育科研状况进行分析,指出了人们对教育科研的认识偏差,以及管理机制不健全,组织结构混乱,制度流于形式,教育科研缺乏针对性,重形式、轻效果现象突出等问题。提出提高思想认识,构建教育科研新机制,打造＂科研兴校＂优良环境,应是高等职业教育健康发展的重要举措。     

新时期我国农村公共产品供给问题探析

农村公共产品是农民增收,农业和农村得以发展的前提保证。但目前我国农村公共产品供给存在着供给总量不足,供给效能低下和供给主体错位等问题。当然,导致农村公共产品供给困难的原因是多方面的,文章主要从两方面来分析,并根据这两方面原因提出了加大对农村公共产品的供给,建立农民需求表达机制,实现供给主体多元化和完善相关监督机制等解决途径。     

关于Diophantine方程x3-8=3py2

设p是奇素数.该文证明了:如果p=12s2 1,其中s是奇数,则方程x3-8=3py2没有适合gcd(x,y)=1的正整数解(x,y).     

Scheduling professionals in the retail pharmacy chain

To control operating costs, a zero-one integer programming model is developed to assist pharmacy staff scheduling decisions. Variable scheduling needs are met by the assignment of relief (mobile) pharmacists to help or temporarily replace full-time pharmacists. Assignments of relief pharmacists over a two-week planning horizon are determined with consideration given to variations in wage rates and travel costs together with the underlying corporate, contractual and operating constraints. The developed model has been applied with considerable success using data collected from a business district in the US located in northern Louisiana related to a national retail chain pharmacy. Forecasting the number of chain retail outlets in the near future has been also performed and the results obtained argue in favor of adopting the model by the entire chain.     

Requiring Connectivity in the Set Covering Problem

Given a bipartite graph with bipartition V and W, a cover is a subset C V such that each node of W is adjacent to at least one node in C. The set covering problem seeks a minimum cardinality cover. Set covering has many practical applications. In the context of reserve selection for conservation of species, V is a set of candidate sites from a reserve network, W is the set of species to be protected, and the edges describe which species are represented in each site. Some covers however may assume spatial configurations which are not adequate for conservational purposes. Indeed, for sustainability reasons the fragmentation of existing natural habitats should be avoided, since this is recognized as being disruptive to the species adapted to the habitats. Thus, connectivity appears to be an important issue for protection of biological diversity. We therefore consider along with the bipartite graph, a graph G with node set V, describing the adjacencies of the elements of V, and we look for those covers C V for which the subgraph of G induced by C is connected. We call such covers connected covers. In this paper we introduce and study some valid inequalities for the convex hull of the set of incidence vectors of connected covers.MSC2000: 90C10, 90C57This authors research was financially supported by the Portuguese Foundation for Science and Technology (FCT).This paper is part of this authors Ph.D. research.     

“大学生上网“负面影响分析及消解对策

网络在给大学生带来便捷的同时,也带来了一定的负面影响.大学生溺网、网恋、上不健康网站以及由此引起的社会治安问题等已经引起了社会各界的普遍关注.要消除"大学生上网"产生的负面影响,高校应从提高学生网络素质,培养大学生网上自律,构建高校网络文化主阵地等方面入,引导大学生正确对待网络、做到健康上网.     

Zero-Lifting for Integer Block Structured Problems

This paper deals with the relations between the polyhedron described by the inequalities of a block structured problem and the polyhedra described by the inequalities of the single blocks. In particular, classes of block structured problems are described for which zero-lifting of facet inducing inequalities of a single block yields facet inducing inequalities for the whole problem. Some applications are discussed.     

Short-Term Dermal Absorption and Penetration of Chemicals from Aqueous Solutions: Theory and Experiment

Dermal penetration of organic chemical-contaminated water from showering and bathing scenarios is a concern of regulatory agencies that have been tasked with determining safe exposure levels. During household showering and bathing, nearly the entire surface area of the body is exposed for short periods of time (5-15 minutes). The primary means of predicting body burden during brief exposures is to estimate total chemical penetrated from the steady-state penetration rate using a skin permeability coefficient. A variety of approaches has been recommended to estimate "body burden." The purpose of this investigation was to collect experimental data from short-term exposures to an organic chemical (dibromomethane [DBM]) in aqueous solution so that methods for estimating body burden could be compared. Rat skins were exposed in vitro to saturated aqueous solutions of DBM for 20 minutes and the amount of chemical in the receptor solution and the skin was analyzed. The total DBM mass in the receptor solution and the skin was taken to represent an in vivo body burden. These results were compared with the estimates of penetration from steady-state calculations, square root of time calculations, and a biologically based mathematical model. Results indicated that the amount of chemical in the skin and its fate during short exposures is important. The square root of time approach predicted total amount of chemical absorbed and penetrated better than did the steady-state approach. The biologically based mathematical model accurately predicted total body burden and could be used to distinguish between the amount of chemical in the skin and the amount of chemical that penetrated through the skin, which would be useful for understanding local toxicity.     

On Disjunctive Cuts for Combinatorial Optimization

In the successful branch-and-cut approach to combinatorial optimization, linear inequalities are used as cutting planes within a branch-and-bound framework. Although researchers often prefer to use facet-inducing inequalities as cutting planes, good computational results have recently been obtained using disjunctive cuts, which are not guaranteed to be facet-inducing in general.A partial explanation for the success of the disjunctive cuts is given in this paper. It is shown that, for six important combinatorial optimization problems (the clique partitioning, max-cut, acyclic subdigraph, linear ordering, asymmetric travelling salesman and set covering problems), certain facet-inducing inequalities can be obtained by simple disjunctive techniques. New polynomial-time separation algorithms are obtained for these inequalities as a by-product.The disjunctive approach is then compared and contrasted with some other general-purpose frameworks for generating cutting planes and some conclusions are made with respect to the potential and limitations of the disjunctive approach.     

CET写作能力提高的必要性及途径

为了增强中外语言交际能力,提高大学生ＣＥＴ写作能力十分必要,可是ＣＥＴ写作一直是众多大学生的弱项。鉴于此,本文通过对问卷调查结果及学生写作中存在的句型单一、成份缺失与布局不合理等主要问题的分析,提出“火花式训练＋十句训练法”,“名言警句＋主题句”等一系列改进方法及其途径。