情境与探究教学模式的构建及实例分析

研究分析了情境与探究教学模式的内涵及具体实施过程.并以物理实验"用单摆测定重力加速度"为例进行了教学实践.结果表明,这种教学模式行之有效,符合新课程改革的教学理念.     

论住宅户型设计

为适应现代人居住观念的变化，结合设计工作的实践，分别就住宅户型设计中的户内空间序列以及起居室、卧室、厨房、卫生间的设计理念、设计原则和有关具体问题进行了探讨。     

提高风险投资过程中两级委托—代理效率的思考

本文从对风险投资者与风险投资商、风险投资商与风险企业之间的两层委托代理的简要分析入手 ,首先在诠释委托—代理效率内涵的基础上构建了分析委托—代理效率的一个理论框架 ,并应用此框架对如何提高上述两层委托—代理关系的效率问题进行了探讨     

论中国儒家思想中人的发展观

从狭义上讲，人的发展观是关于个体人的发展的最根本的看法。中国传统社会中儒家思想的人的发展观就是在这个意义上讨论的，它着重把人的发展的本质内容理解为人的道德修养。这种人的发展观的形成有其深刻的社会经济根源和政治基础。     

电磁场中带电粒子束运动的力学模拟

研究以不同初速度进入互相垂直的匀强磁场和均强电场中的带电粒子束的运动情形，并同相似的力学运动相比拟，建立了直观的力学模型。     

The mechanism of ethylene polymerization by nickel salicylaldiminato catalysts - Agostic interactions and their kinetic isotope effects

The ethylene polymerization reaction of a neutral nickel catalyst was studied by DFT calculations at the Becke3LYP/6-31G(d) level of theory. As in related cases a β-agostic bond stabilizes the nickel alkyl ground states. Transition states for the insertion of the olefin show a distinct α-agostic interaction, which has not been observed for late metal polymerization catalysts before. An ethylene-alkyl complex was identified as the resting state of the reaction. The overall barrier height of the reaction amounts to 17.54 kcal/mol, which slightly increases to 17.60 kcal/mol for the polymerization of deuterated ethylene. Therefore, a small positive kinetic isotope effect (k_H/k_D = 1.09) can be calculated, which is caused by the α-agostic interaction in the transition state. A comparison to other late metal based polymerization systems reveals that the ethylene coordination step of highly active catalysts is significantly lower in energy compared to catalysts which are only moderately active.     

Existence of the uniformly minimum risk equivariant estimators of parameters in a class of normal linear models

In this paper, we study the existence of the uniformly minimum risk equivariant (UMRE) estimators of parameters in a class of normal linear models, which include the normal variance components model, the growth curve model, the extended growth curve model, and the seemingly unrelated regression equations model, and so on. The necessary and sufficient conditions are given for the existence of UMRE estimators of the estimable linear functions of regression coefficients, the covariance matrixV and (trV)^α, where α > 0 is known, in the models under an affine group of transformations for quadratic losses and matrix losses, respectively. Under the (extended) growth curve model and the seemingly unrelated regression equations model, the conclusions given in literature for estimating regression coefficients can be derived by applying the general results in this paper, and the sufficient conditions for non-existence of UMRE estimators ofV and tr(V) are expanded to be necessary and sufficient conditions. In addition, the necessary and sufficient conditions that there exist UMRE estimators of parameters in the variance components model are obtained for the first time.     

On the Local Uniqueness of Solutions of Variational Inequalities Under H-Differentiability

In this paper, we give some sufficient conditions for the local uniqueness of solutions to nonsmooth variational inequalities where the underlying functions are H-differentiable and the underlying set is a closed convex set/polyhedral set/box/polyhedral cone. We show how the solution of a linearized variational inequality is related to the solution of the variational inequality. These results extend/unify various similar results proved for C ¹ and locally Lipschitzian variational inequality problems. When specialized to the nonlinear complementarity problem, our results extend/unify those of C ² and C ¹ nonlinear complementarity problems.     

Pulse radiolysis study of the initial steps of the polymerization of cyclohexyl acrylate and cyclohexyl methacrylate

Pulse radiolysis with kinetic spectroscopic detection was applied to study the kinetics of the first steps of radiation induced polymerization of cyclohexyl acrylate and cyclohexyl methacrylate in cyclohexane solvent. The reactions were initiated by cyclohexyl radicals produced in the radiolysis of the solvent. The transient absorption spectra of the -carboxyalkyl type radicals produced in addition reaction show maxima around 300 nm. This shifts to longer wavelength with time after the pulse. This phenomenon was explained by the oligomerization reaction. From the kinetic curves average rate coefficients of termination for the oligomer radicals (2k_t) were determined as a function of time elapsed after the electron pulse. The values obtained were compared with those calculated for other (acrylate and methacrylate type) monomers.     

静脉滴注的临床决策

提出了静脉滴注的动力学一般模型，讨论了模型的性质，在给药剂量确定的条件下，探讨了调整滴注速率使治疗效果达到最佳的临床决策方法。