碱性与中基性粗集料影响混凝土抗冻性能对比

粗集料作为混凝土的重要组成材料,其品质直接关系到混凝土的各项性能.通过试验对比研究了碱性矿料石灰岩(ω(SiO_2)为1.01%)和中基性矿料玄武岩(ω(SiO_2)为53.5%)混凝土的抗冻性能,分析了两类试件的质量损失率和相对动弹性模量.结果表明:碱性矿料能够提高混凝土的抗冻性能,这对解决混凝土抗冻性能具有重要意义.     

An effective estimation of distribution algorithm for parallel litho machine scheduling with reticle constraints

In order to improve the scheduling efficiency of photolithography, bottleneck process of wafer fabrications in the semiconductor industry, an effective estimation of distribution algorithm is pro-posed for scheduling problems of parallel litho machines with reticle constraints, where multiple reti-cles are available for each reticle type.First, the scheduling problem domain of parallel litho ma-chines is described with reticle constraints and mathematical programming formulations are put for-ward with the objective of minimizing total weighted completion time.Second, estimation of distribu-tion algorithm is developed with a decoding scheme specially designed to deal with the reticle con-straints.Third, an insert-based local search with the first move strategy is introduced to enhance the local exploitation ability of the algorithm.Finally, simulation experiments and analysis demonstrate the effectiveness of the proposed algorithm.     

基于云计算环境的蚁群优化计算资源分配算法

提出一种基于蚁群优化(Ant Colony Optimization)的计算资源分配算法.分配计算资源时,首先预测潜在可用节点的计算质量,然后根据云计算环境的特点,通过分析诸如带宽占用、线路质量和响应时间等因素对分配的影响,利用蚁群优化算法得到一组最优的计算资源.通过在Gridsim环境下的仿真分析和比较,这种算法能够在满足云计算环境要求的前提下,获得比其他一些针对网格的分配算法更短的响应时间和更好的运行质量,因而更加适合于云环境.     

一种在OFDMA使用的公平自适应资源配置方案

在OFDMA中使用了跨层(Cross-layer)来进行自适应资源调配。OFDMA系统中利用跨层结构,在数据链路层的信息可以用来实现自适应资源调配。根据这个设想,设计了一个新的跨层自适应资源调配方案来保证用户在连接层中等待时间的公平性,并取得更好的频谱利用率。     

资源环境条件制约下的我国现代农业发展对策

本文从人口与资源环境条件、科学技术水平、世界农业发展经验教训等方面论述了我国农业现代化面临的挑战与机遇,讨论了世界主要国家农业现代化的经验教训,提出了我国现代农业发展思路转变与政策取向建议。     

One-step disposal of Cr (Ⅵ)-bearing wastewater by natural pyrrhotite

Cr(VI)-bearing wastewater can be treated by natural pyrrhotite which is used for reductant to reduce Cr(VI) and precipitant to precipitate Cr(III) simultaneously. The disposal products can be divided into three parts in the beakers, namely supernatant in the upper part, the yellowish colloidal precipitates in the middle part and the pyrrhotite in the lower part. The content of total Cr=Cr(VI)+Cr(III) in the supernatant liquid is 0.06 mg/L, which is lower than 1.5 mg/L of the discharge standard of China and near to 0.05 mg/L of the standard of potable water. This one-step disposal composing of both reduction and precipitation which is traditionally divided into two independent steps called reducing technology and precipitating technology respectively. The new method is of obvious economic advantage and favourable to decreasing surplus mud derived from adding Ca(OH)₂ to precipitate Cr(III) traditionally so as to avoid recontamination. In fact, sodium sulfite (Na₂SO₃) used in disposal of Cr(VI) was traditionally produced from natural mineral of pyrrhotite (FeS). One molecule of FeS is 4 times more than that of Na₂SO₃ from a view point of rational use of mineral resources. Therefore the prospective of application of the one-step disposal of Cr(VI) method is full of promise.     

论新世纪医院图书馆如何适应医院发展及临床科研

分析了新世纪医院图书馆的现状及面临的问题,探讨了医院图书馆在新世纪如何适应现代化医院的发展,更好地为医务人员服务。     

闽台物流资源整合模式研究

闽台物流资源的互补性促进物流资源的整合。产业集群、并购、合资及联盟是物流资源整合的常见模式，各种模式存在不同利弊之处，有着不同的适用性。闽台物流相关企业在整合物流资源实践中应充分考虑企业自身所处行业特点、企业规模等影响因素，选择其中一种或多种模式，发挥各种模式的比较优势，达到物流资源整合“1＋1〉2”的效果。     

运用信息技术，构建新型教学结构

主要阐述了教学结构的概念，并从几个不同侧面论述了构建新型教学结构的必要性和迫切性，进一步分析了信息技术的特点和优势以及对构建新型教学结构的现实意义．     

坚持以人为本理念 实现企业健康发展

"人品优先、能力适度、敬业为本、团队第一"的理念,是企业人力资源部门应把握的原则,也是全体员工共同遵守的守则.