波齿传动的受力分析和效率计算

本文对一种新型的传动——波齿传动进行了受力分析和传动效率计算。推导出作用在波齿上诸力之间的关系式和啮合效率的计算公式,为以后提高这种传动的效率、强度及最佳参数选择提供了理论根据。     

多效唑在棉花上残留量的初步研究

本试验在整个棉花生长期喷施多效唑溶液两次，６０天后（收获期），用气相色谱法测定多效唑在棉花植株各部位和土壤中的残留。其结果为：土壤、籽、茎中残留的量未检出，叶、根、壳中的残留量分别为１．２０６，０．３６７，０．４８５ｍｇ／ｋｇ。     

添加剂强化沸腾传热性能的综合评价及预测

用模糊数学的方法对添加剂强化沸腾传热的性能建立了评价及预测模型。对文献中及作者试验过的３７种添加剂强化沸腾传热的效果作了拟合评价，结果表明，有３３种添加剂的评价结果与实测结果相符合，准确率为８９．２％．此外，还对油酸钠和聚乙烯醇两种添加剂强化沸腾传热的能力作了预测，结果也与实测结果相吻合．     

Synthesis of a new meso／microporous composite molecular sieve of MCM-41／mordenite

An MCM-41/mordenite composite with twofold porous structure and stepwise-distributed acidity was prepared for the first time by using zeolite mordenite as the silica-alumina source. The composite molecular sieve has been investigated and compared with a mechanical mixture of mordenite and MCM-41 for their structure, acidity and catalytic activity by means of XRD, N2 adsorption and desorption, HRTEM, DTG, NH3-TPD and catalytic reaction. The characterization results show that the structure and property of the composite molecular sieve are quite different from those of the mechanical mixture, which might be ascribed to the incorporation of secondary building units characteristic of zeolite mordenite into the mesoporous walls of the composite which gives rise to the thicker mesoporous walls, the higher hydrothermal stability and more strong acid sites. Furthermore, the new strategy could be used as a new general method for the preparation of catalysts for the reaction system with multifold large molecules, and the results were well confirmed by the dealkylation of C10^ aromatic hydrocarbon.     

对电子商务条件下的物流模式的研究

电子商务的兴起和发展为企业营销带来了新的契机,也向传统营销提出了新的挑战。文中对电子商务有关内容作了阐述,从物流模式分析当代电子商务的现状,以突破传统的经营思维局限,改革固有的营销策略、物流模式,构建适合电子商务物流的全新运作机制。     

光镊轴向力与吸收系数等参数的关系研究

以射线光学模型为基础．对微粒直径远大于激光微束的米氏粒子在考虑对光的吸收时轴向力与光源参数的关系进行了计算，计算结果给出了轴向力与微粒的吸收系数、波长、激光功率等参数的关系，为实验中参数的选择提供了依据．     

方程dx/dt=-Q(x,x(t-1))具有周期为4的周期解的一个条件

给出了微分差分方程 dx/dt=-Q(x,x(t-1))具有周期为4的周期解的一个条件.     

论高校人才培养成本

高等学校人才培养成本是高等学校管理者必须关注的问题之一。在列举了构成办学成本要素的基础上 ,对其进行了定量与定性分析。提出了既不能追求成本最小而导致投入不足影响教育质量 ;也不能一味投入而造成成本失控。应该保证教育资源尽可能满足教育质量以达到最优的需要     

A_3钢输煤气管道腐蚀穿孔机理的探讨

该文通过对穿越电气列车路轨地基下的A_3钢输煤气管的轨对地电位差、管道上方的电势的测量,对管道的腐蚀区、已腐蚀和未腐蚀界面处的金相分析及煤气组成的分析,提出了A_3钢输煤气管腐蚀穿孔的机理是由于煤气中的杂质使该处介质环境中H~+离子、S~(2-)离子浓,度增大也因煤气中的CO_2在混合电解质溶液中的协同作用,引起了孔(点)蚀,这种电化学局部腐蚀的持续进行,向纵深发展,导致A_3钢输煤气管的腐蚀穿孔。     

A novel genome-wide fulllength kinesin prediction analysis reveals additional mammalian kinesins

Kinesins are microtubule-based motor proteins that perform diverse functions[1―6], including the transloca- tion of vesicles, organelles, chromosomes, proteincomplexes, RNA-binding proteins (RNPs), etc. They also help to orchestrate microtubule dynamics …