双微环谐振腔耦合的双波长半导体激光器（英）

提出一种新颖的单片集成双微环耦合的双波长半导体激光器结构。集成于激光腔内的2个微环谐振腔作为模式选择滤波器,通过游标效应选择谐振模式,同时还可作为等效的反射镜面以形成行波腔。这种无需解理的行波激光腔代替了需要解理面的法布里-珀罗驻波腔。理论仿真表明,跟驻波腔结构相比,行波腔双微环激光器结构简单,可获得约34 mA的较低的阈值电流和大于31 dB的边模抑制比。合理地控制有源区的增益峰值和谐振模式分布,该激光器能提供一致性和稳定性较好的双波长激光输出。     

圆波导TM_(01)-矩形波导TE_(10)模式转换器

设计了一种高功率圆波导TM01-矩形波导TE10模式转换器,可以实现圆波导TM01模式与矩形波导TE10模式之间的相互转换。仿真结果表明:中心频率为9.7GHz时该模式转换器转换效率大于99.99%,回波损耗小于-40dB,转换效率大于90%时的带宽大于0.4GHz。调节底面短路圆波导长度可以实现模式转换器在9.2~10.1GHz范围内调谐(模式转换效率大于99%)。在圆波导和耦合段连接处引入倒角可有效降低场强,提高功率容量,注入功率0.7GW,其表面场强小于1 MV/cm。     

ASYMPTOTIC ANALYSIS OF MODE Ⅱ STATIONARY GROWTHCRACK ON ELASTIC-ELASTIC POWER LAWCREEPING BIMATERIAL INTERFACE

A mechanical model was established for mode Ⅱ interfacial crack static growingalong an elastic-elastic power law creeping bimaterial interface. For two kinds of boundaryconditions on crack faces, traction free and frictional contact, asymptotic solutions of thestress and strain near tip-crack were given. Results derived indicate that the stress andstrain have the same singularity, there is not the oscillatory singularity in the field; thecreep power-hardening index n and the ratio of Young‘s module notably influence the crack-tip field in region of elastic power law creeping material and n only influences distribution ofstresses and strains in region of elastic material. When n is bigger, the creepingdeformation is dominant and stress fields become steady, which does not change with n.Poisson‘s ratio does not affect the distributing of the crack-tip field.     

基于高考数学复习题“选、编”环节的思考

在现行的江苏高考模式中,数学学科分值在总分中所占比重较大,因而数学学科的高考复习工作一直备受广大师生的关注,笔者从事高中数学教育教学工作多年来,一直致力于实现高考数学高效复习的研究工作,在本文中以高考数学复习为探究载体,采取理论研究与实际案例相结合的方式,侧重于阐述高中数学教师在高考复习中如何合理进行"选、编"高考复习试题,以期快速提升高考数学复习的质量与效率,以飨读者.一、对于高考数学复习题要做到"选得当,     

2010年上海世博会食品安全保障方案制定

不久前,上海市食品安全联席会议办公室宣布,上海已制定《世博食品安全保障工作总体方案》及相关管理规范、应急预案等,届时将采取“分级分区”的监管模式保障世博食品安全。     

Bs →φπ^0 Decay in the Extra Down-Type Quark Model

Using the QCD factorization approach, we investigate the electro-weak penguin dominated process 13~ --, q57r~ in the extra down-type quark （EDQS） model. We calculate the effects of new physics （NP） on the branching fraction and direct CP asymmetry of the decay mode. It is found that the branching fraction can be increased by 15~o points or dropped by 13~o points than the standard model （SM） value, and its direct CP asymmetry can be increased by 35% points or dropped by 37% points than the SM one. The effects of NP on the direct CP asymmetry are more obvious than on the branching fraction. If this decay mode could be measured in the upcoming LHCb experiment, these results we obtain will be useful for further studies of the EDQS model.     

Temperature-Dependent Raman Spectrum of Hexagonal YMnO3 Films Synthesized by Chemical Solution Method

We study the temperature-dependent Raman spectrum of hexagonal YMnO3 films prepared by a chemical solution method. There are seven Raman peaks （3A1 ＋ E1 ＋ 4E2） of the film identified at room temperature. From the results of temperature dependence of the Raman spectrum, it is deduced that the YMnO3 film has a magnetic phase transition temperature of about 123K. The temperature variation phonon mode at 685cm^-1 shows an anomalous frequency variation near 123 K, suggesting either a more complex mechanism of spin-phonon coupling or strong mixing of phonon modes. The reason for the higher antiferromagnetic Néel temperature TN of the film than that of the bulk counterpart is also discussed.     

上海闵行区青年物理教师有效培训模式

上海闵行区属人口导人区,地域广、新建学校多,物理学科35岁以下青年教师约占三分之一以上;很多青年教师是非师范专业毕业,教学功底不够扎实,尤其是教学经验缺乏．由于大多数学校物理教师人数较少,青年教师平时缺少交流、研讨的机会,有些青年教师的教学长期在低水平重复,抑制了他们的专业发展,直接影响了工作质量,也影响了教师的生活质量．这是目前二期课改推进过程中急需解决的问题之一．     

常微分方程解题模式的构建

为了解决常微分方程教学实践中出现的“断点”问题．在Polya解题观和建构主义学习观的指导下,结合大学常微分方程知识特点,提出基于Polya解题观的常微分方程解题模式。实践表明,本模式对于提高常微分方程教学效果和学生的学习效率具有一定的理论和实践意义．     

基于熵权法的DEA/AR交叉效率知识化制造模式评价

用模糊DEA/AR交叉效率方法,解决制造模式的评价与排序问题.首先,构建了四种不同的DEA/AR交叉效率模型—任意型、对抗型、友好型和博弈型.然后,应用熵权法确定每一种交叉效率模型的最终交叉效率值,目的是用保证域来避免传统模型的权重偏差,从而实现了决策单元的相对有效评价和精确排序.同时,引入奇异指数的概念来衡量最终交叉效率的合理性及可靠性.最后,通过实例验证本文模型和方法的可行性及有效性:与采用简单DEA效率模型进行评价比较,我们的方法会使得效率更加精准、排序更加合理.