团体动力学在体育技术课教学中的应用研究

依据团体动力学的理论,运用教学实验法,在体育技术课教学中,通过设置合理明确的教学目标,制定切实有效的课堂规范,开展适当的竞争和积极的合作,营造民主和谐的课堂气氛,能够提高教学质量和教学效果。     

动态法测杨氏模量共振频率的拟合研究

分析讨论了动力学法测杨氏模量基频固有频率的最小二乘法拟合,指出在笔者采用数据的试验条件下,拟合多项式的幂次以3~4次为宜.     

基于转运协调机制的救灾物资库存控制策略与仿真

通过地方储备库之间的灾后救灾物资转运,可以解决本地救灾物资储备不足和被破坏等问题,并且规避应急采购响应时间长和物流配送成本高等的缺点。本文建立的具有转运机制的救灾物资储备因果回路图显示,转运本身不会使得系统库存趋于合理化,而只能通过应急采购这一系统的负反馈回路将各地方储备库的目标库存调整至合理水平。同时,一系列仿真对比试验也表明,相同的库存策略的实施效果因需求概率、单位转运成本和灾前采购成本而异;同时,各储备地既希望充分利用转运的优势,降低本地成本,又希望规避对方的转运需求带来的本地采购成本的上升,矛盾的双方必须放到统一的灾前物资储备规划系统中,才能以最少的总库存成本满足最高的总体救灾需求。     

基于系统动力学的固体矿物燃料二氧化碳排放量估算研究

固体矿物燃料的排碳量不仅与其生产方式,能源利用强度等有关,还与经济系统中的科技,人口等因素间接相关。在分析固体矿物燃料排碳系统各要素间的反馈互动机制后,构建了系统动力学模型,采用系统仿真的方法,达到预测和分析固体矿物燃料CO2排放量的目的。依据模型的仿真结果,固体矿物燃料的CO2排放量将在2015年前后达到高峰。最后总结了其CO2减排的启示及对策,为其它学者的后续研究提供相关依据。     

钻孔石墨烯用于氢气和氮气分离的分子动力学模拟(英文)

利用分子动力学模拟方法,发现不同孔径的钻孔石墨烯对氢气和氮气有很好的分离性.当挖去了10个碳原子,孔径为0.3725 nm时,分离效率可以达到100%.由结果可以预见,钻孔石墨烯将会在气体分离和纯化方面有应用潜力.     

System Dynamics Approach to Urban Water Demand Forecasting --A Case Study of Tianjin

A system dynamics approach to urban water demand forecasting was developed based on the analysis of urban water resources system.which was characterized by multi.feedback and nonlinear interactions among system elements.As an example,Tianjin water resources system dynamic model was set up to forecast water resources demand of the planning years.The practical verification showed that the relative error was lower than 1O%.Furthermore,through the comparison and analysis of the simulation results under different development modes presented in this paper.the forecasting results ofthe water resources demand ofTianiin was achieved based on sustainable utilization strategy of water resources.     

烤烟种子萌发活动中有关酶及物质动态研究

以K326品种为材料,探索烤烟种子萌发活动中有关酶活性及相关物质的变化动态,结果表明：呼吸强度、淀粉酶与可溶性总糖和还原糖,蛋白酶与总游离氨基酸,脂肪酶与脂肪酸,以及过氧化物酶（POD）、多酚氧化酶（PPO）、可溶性蛋白质、脯氨酸（pro）、丙二醛（MDA）等的活性或含量都随种子萌发进程呈上升趋势,虽然其间有所起伏,但高峰期大都在第84～168h之间,仅POD、总游离氨基酸与MDA含量在萌发中期才开始明显上升,直到萌发结束时达高峰期．淀粉酶、蛋白酶、脂肪酶活性与各自催化水解的产物含量相关性显著,粗脂肪含量随萌发进程而下降,与脂肪酸含量呈极显著负相关．萌发集中在46～68h,发芽势96％,同步指数0．94．萌发动态符合Logistic生长曲线方程．     

带电聚合物刷的分子动力学模拟和研究

主要介绍通过分子动力学模拟来研究带电聚合物刷在水溶液和盐溶液中的结构性质,分别给出不同吸附密度下的单体密度,补偿离子分布图。通过模拟得到的刷子高度与通过新标度理论得到的高度值吻合的很好。验证了在渗透区,吸附密度对刷子的高度是存在影响的,并讨论了在同一吸附密度下,Debye长度对刷子结构的影响,刷子的高度随着Debye长度的增大而变大,进而达到通过盐离子浓度来控制刷子结构的目的。     

Seasonal changes in tannin and nitrogen contents of Casuarina equisetifolia branchlets

Seasonal dynamics of total phenolics (TP),extractable condensed tannins (ECT),protein-bound condensed tannins (PBCT),fiber-bound condensed tannins (FBCT),total condensed tannins (TCT),and protein precipitation capacity (PPC) in young,mature and senescent branehlets of Casuarina equisetifolia were studied at Chishan Forestry Center of Dongshan County,Fujian Province,China.In addition,nitrogen contents of branehlets at the different developmental stages were also determined.The contents of TP and ECT,and PPC in young branchlets were significantly higher than those in mature and senescent branehlets through the season.However,PBCT contents were significantly higher in senescent branchlets than those in young and mature branchlets;FBCT fluctuated with season.Young branchlets had the highest N content,which decreased during branch maturity and senescence.The highest contents of TP and the lowest contents of TCT and N in young and mature branchlets were observed in summer.There was a significant negative correlation between TP and N contents.In contrast,TCT contents were positively correlated to N contents.Nutrient resorption during senescence and high TCT:N ratios in senescent branchlets are the important nutrient conservation strategies for C.equisetifolia.