新形势下优秀运动队的管理

新形势下,优秀运动队的管理必须适应时代发展的方向和要求,与时俱进,把"建设和谐社会,坚持以人为本"的指导思想贯彻到具体工作中。要想管理好运动队,提高竞技运动水平,就要坚持"以人为本",营造和谐训练环境;发挥运动员主体作用,提高自我管理能力;增强运动员内在动力,提高训练自觉性;建立健全规章制度,提高管理的科学性,增强团队精神,培养集体意识。     

对高校女生100米跑成绩滞后的探讨

本文分析了高校女生短跑成绩滞后的原因,探讨其提高短跑成绩与各因素之间的相互关系。指出应重点培养女生加速能力的训练,全面发展身体力量并提高肌肉的柔韧性,提高女生的步频与步长能力,从而提高短跑教学质量。     

影响海南农村住户经济活动差异的统计分析

为了寻找影响海南农村住户经济活动差异的因子 ,在建立三个评价指标体系的基础上 ,利用多元统计的分析方法分别对三个评价指标体系进行聚类 ,同时采用SAS中STEPDISC过程的STEPWISE方法求出最能影响各类间差异的因子 ,并有相对性地提出一些建议与对策 .     

平行分束偏光镜的矩阵表示及其应用

从几何光学变换矩阵出发，结合琼斯矩阵，导出一种新的处理偏光器件光线变换的矩阵方法。     

Study on reduction of MoS<Subscript>2</Subscript> powders with activated carbon to produce Mo<Subscript>2</Subscript>C under vacuum conditions

A method of preparing Mo₂C via vacuum carbothermic reduction of MoS₂ in the temperature range of 1350-1550℃ was proposed. The effects of MoS₂-to-C molar ratio (α, α=1:1, 1:1.5, and 1:2.5) and reaction temperature (1350 to 1550℃) on the reaction were studied in detail. The phase transition, morphological evolution, and residual sulfur content of the products were analyzed by X-ray diffraction, field-emission scanning electron microscopy, and carbon-sulfur analysis, respectively. The results showed that the complete decomposition of MoS₂ under vacuum is difficult, whereas activated carbon can react with MoS₂ under vacuum to generate Mo₂C. Meanwhile, higher temperatures and the addition of more carbon accelerated the rate of carbothermic reduction reaction and further decreased the residual sulfur content. From the experimental results, the optimum molar ratio α was concluded to be 1:1.5.     

Flotation mechanisms of molybdenite fines by neutral oils

The flotation mechanisms of molybdenite fines by neutral oils were investigated through microflotation test,turbidity measurements,infrared spectroscopy,and interfacial interaction calculations.The results of the flotation test show that at pH 2-11,the floatability of molybdenite fines in the presence of transformer oil is markedly better than that in the presence of kerosene and diesel oil.The addition of transformer oil,which enhances the floatability of molybdenite fines,promotes the aggregation of molybdenite particles.Fourier transform infrared measurements illustrate that physical interaction dominates the adsorption mechanism of neutral oil on molybdenite.Interfacial interaction calculations indicate that hydrophobic attraction is the crucial force that acts among the oil collector,water,and molybdenite.Strong hydrophobic attraction between the oily collector and water provides the strong dispersion capability of the collector in water.Furthermore, the dispersion capability of the collector,not the interaction strength between the oily collectors and molybdenite,has a highly significant role in the flotation system of molybdenite fines.Our findings provide insights into the mechanism of molybdenite flotation.     

三棱镜折射面成像研究

针对等边三棱镜顶角不精确为60°,两个底角不相等的情况,对三棱镜折射面成像规律进行了研究,得出了成像的普遍规律,为精确测量三棱镜顶角提供了理论基础及实验方法。     

谈化学实验竞赛对实验教学的促进作用

总结了同济大学参加上海市大学生化学实验竞赛的经验,通过竞赛发现实验教学中的薄弱环节,针对存在问题,在教学内容、教学手段及教学方式方面进行改革,达到提高学生的基本技能、自主性实验能力及创新能力目的,分析了实验竞赛和实验教学之间的关系.     

基于改进蚁群算法的敏捷成像卫星任务调度方法

针对敏捷成像卫星观测任务调度问题, 综合考虑卫星最长连续工作时间、任务间卫星姿态调整时间、能量、容量等约束建立了任务调度模型. 考虑到密集任务间的相互影响, 着重分析了任务间卫星姿态调整时间约束, 并给出调姿时间求解方法. 提出一种改进蚁群算法对问题进行求解, 借鉴蚁群系统(ACS)和最大最小蚂蚁系统(MMAS)的思想设计寻优策略和信息素更新策略. 并结合实际约束, 引入最早、最晚可观测时间和任务优先级等因素来控制转移概率. 实验算例验证了模型和算法的有效性.     

用模糊调度系统求解动态Job Shop问题

研究工件加权拖期总和最小化的动态 Job Shop调度问题 .提出了一个模糊调度系统 ,用以动态地选取启发式调度规则以求解该问题 .特别地 ,该系统具有从模糊规则和以前经验中学习的能力 .各种不同条件下的仿真实验表明该模糊调度系统是有效的.