A profit-maximizing supply chain network design model with demand choice flexibility

We present a profit-maximizing supply chain design model in which a company has flexibility in determining which customers to serve. The company may lose a customer to competition if the price it charges is too high. We show the problem formulation and solution algorithm, and discuss computational results.     

多维Lotka-Uolterra周期系统周期解的存在性及其全局吸引性

研究了m-维离散Lotka-Volterra竞争系统，并获得了该系统周期解的存在性及其全局吸引性.     

On CCE graphs of doubly partial orders

Let D be a digraph. The competition-common enemy graph (CCE graph) of D has the same set of vertices as D and an edge between vertices u and v if and only if there are vertices w and x in D such that (w,u), (w,v), (u,x), and (v,x) are arcs of D. We call a graph a CCE graph if it is the CCE graph of some digraph. In this paper, we show that if the CCE graph of a doubly partial order does not contain C₄ as an induced subgraph, it is an interval graph. We also show that any interval graph together with enough isolated vertices is the CCE graph of some doubly partial order.     

溴碘化银薄片乳剂颗粒中碘离子分布对潜影分散的影响

碘溴化银乳剂薄片颗粒的潜影分散与碘离子在颗粒中的分布有关。本文用交叉光楔曝光技术测定了由次潜影造成的潜影分散,并根据所测出的潜影分散度和乳剂的表面感光度,对内、表敏的分布作了分析。结果表明,碘离子分布在颗粒边缘的乳剂,其表面潜影分散度要比碘离子均匀分布的颗粒更甚,后者且表现出内、表敏度竞争的现象。     

实行“明标”投标方式,搞好建筑市场管理

针对新时期工程建设管理中出现的新情况新问题,东莞市建委对建筑工程实行招标承包抽,将常用的“暗标”投标方式改为“明标”投标方式,作者就这一做法进行了分析思考,认为这是当前招标工作中行之有效的办法。     

Comparison of tridentate ligands in competition experiments for their ability to form a [Tc(CO)3] complex

In this study we have compared different ligands containing three or more hetero-atoms (N, O and/or S) with respect to their ability to form tridentate complexes with a Tc-tricarbonyl moiety. Comparison of each ligand in a competition reaction with histidine first and then with each other compound allowed to rank the ligands according to their ability of complex formation with the [^99mTc(CO)₃]⁺ precursor from diethylenetriamine (most efficient of the studied ligands) to nitrilotriacetic acid (weakest complexing properties). The results provide insight in the structural requirements for the formation of stable Tc-tricarbonyl complexes and suggest preferred combinations and arrangements of the hetero-atoms involved in the complex formation. They also give a good indication which type of ligand is most appropriate to modify biomolecules for an efficient and stable labelling with a Tc-tricarbonyl moiety.     

自组织视域的科技创新体系建设

概述了自组织原理 ,并从自组织的角度探讨了科技创新体系实现自组织演化的机制。认为 :我国在建设区域和国家科技创新体系的过程中 ,要着重解决好科技创新体系生成的动力和条件问题 ,就是既要建立各创新主体之间既竞争又合作的互动关系 ,又要创造有利于科技创新体系健康生长的制度环境 ,尤其是要解决体制低效问题。最后 ,提出了若干启示     

卤代烷反应中取代和消去竞争的教学设计

在卤代烷的取代和消去反应中,进攻试剂均为带负电的实体或多电子基团,因此取代和消去的竞争是卤代烷教学内容的重点和难点。本文介绍我们对这部分教学内容的组织和设计,使学生更好地理解反应底物、进攻试剂和反应条件对优势反应及产物的影响。该教学设计对培养学生的分析能力、思考能力和灵活应用知识的能力具有重要作用。     

Lotka-Volterra型N-种群竞争系统的持久性和稳定性

本文研究一类具有无穷时滞的概周期Lotka-Volterra型N-种群竞争系统的持久性和全局渐近稳定性.一些新的充分条件被得到.