超声波作用下金属锂诱发的芳香醛的还原偶联反应

芳香醛和金属锂在超声波作用下于THF中室温反应2，邻二醇的收率为15%-79%。     

一类可积的Riccati型方程

利用齐次微分方程变换u=y/x，给出一类可积的Riccati型方程。     

CoNi/CoO 双层膜磁化反转机制与温度的依赖关系

Exchange coupling and magnetization reversal mechanism in two series of Co_xNi_(1-x)/CoO(30 nm)(x=0.2 and 0.4)bilayers are studied by vector magnetometer.Two components of magnetization are measured parallel and perpendicular to the applied field.At low temperatures,coercivity H_c∝(t_(FM))~(-n),n=1.5 and 1.38 for x=0.2 and 0.4,respectively,in agreement with the random field model.At room temperature,the coercivity is nearly proportional to the inverse FM layer thickness.In addition to the exchange field and the coercivity,the characteristic of the magnetization reversal mechanism was found to change with temperature.At temperatures below 180 K,magnetization reversal process along the unidirectional axis is accompanied only by nucleation and pinning of domain wall while magnetization rotation is also involved at high temperatures.     

论数学教学耦动理论的建构--兼谈数学教学研究的教育学取向

数学教学理论建构的价值取向呈现多元化态势,数学教育学取向并不就是“ 教育学 数学”.数学教学耦动理论的建构需要综合运用问卷调查法、访谈法、实验法、思辨法、演绎法、层次研究法等多种研究方法,围绕“ 为什么教/学?教/学什么?怎样教/学?教/学得怎样” 等教学的基本问题,以教学耦动观为逻辑起点.数学教学耦动理论可概括为:一种观点,二大目的,三项内容,四个层次,五个环节,六项指标.     

增程式电动汽车失火——不对中耦合故障的诊断特征变化研究

在增程器失火-不对中耦合故障下,通过多工况下虚拟样机仿真,对失火故障的故障诊断特征变化规律展开了研究。借助虚拟样机平台搭建某款增程器虚拟样机刚柔混合模型,对已经探索到的失火故障诊断特征,在多转速、多不对中工况下,研究了耦合故障下失火故障诊断特征变化的规律;并通过对失火故障特征变化进行机理分析,说明了其与特征变化规律研究的一致性。     

Nonlinear Analysis of Shape Memory Alloy Component in Rotor System

The active control of rotor vibration was studied while shape memory alloy (SMA) spring component was chosen as bearing of rotor system. The vibration of rotor system was controlled by the phase transformation of SMA with electric heating method. The SMA spring component has nonlinear coupling problem of thermal stress and thermal elasticity, because thermal constants α,β and elasticity constants γ, G vary with temperature when temperature changes sharply. Because δ,ε were both small parameters, their square items could be ignored and approximate results were obtained by perturbation. The characters of α,β, γ, G changing with temperature were analyzed. Results show that the character of thermal diffusivity ot changes with temperature, which cannot influence U,Ψ,So the nonlinearity of ot can be ignored; the character of,β changes with temperature,which cannot influence U, but influences Ψ at high temperature; the character of γ, G change with temperature, which cannot influence Ψ, but influences U with U^(01) ε. The more γ ,G, the more their influence on U;the nonlinearity of βT/pcvεkk influences U and Ψ, which must be calculated.     

半导体激光器和光纤耦合的实现方法

从波动理论出发,分析了半导体激光器与光纤耦合的理论,讨论了实现半导体激光器和光纤耦合的方法,其中锥端球面微透镜耦合效率可达到80%,展望了半导体激光器和光纤耦合技术的发展前景。     

广东省新型城镇化与流通业的耦合协调研究

构建耦合协调度模型,基于统计数据,测度2010—2018年广东省新型城镇化与流通业的耦合协调度及相对发展度状况。研究发现,近三年两系统已达到优质耦合协调,但从相对发展度来看,流通业滞后于新型城镇化,两者存在系统退化的风险。深圳市的耦合协调度、对比发展度都处于良好态势,其他地区各异,汕尾和河源的两系统没有达到耦合协调且存在系统退化风险。在实证分析的基础上,对广东省新型城镇化与流通业的发展提出了相应的建议。     

对积件概念的理解

信息高速公路的建成，Internet网络的风靡全球，正在撕破传统的时空观，改变着人们的生产、生活方式，并引发了教育技术史上一场新的革命，积件（Interable Ware）概念也正在进入高级课件的设计之中，本就积件的定义、特征以及组成平台等问题进行了阐述。     

对积件思想的实践

课件固化了教学思想、内容和策略,面临着不能适应千变万化的课堂教学的严峻挑战．积件的着眼点是一个个知识点,与教育思想、方法和学习理论都无关,教师可根据不同的教学环境,选择合适教育思想、方法,运用积件组合平台,构建辅助教学软件,体现了“以不变应万变”的重要思想．本文试图在积件思想的指导下,对积件开发作出必要的探索和实践．