Expansion of spherical cavity of strain-softening materials with different elastic moduli of tension and compression

An expansion theory of spherical cavities in strain-softening materials with different moduli of tension and com-pression was presented. For geomaterials,two controlling parameters were introduced to take into account the different moduli and strain-softening properties. By means of elastic theory with different moduli and stress-softening models,general solutions cal-culating Tresca and Mohr-Coulomb materials' stress and displacement fields of expansion of spherical cavity were derived. The effects caused by different elastic moduli in tensile and compression and strain-softening rates on stress and displacement fields and development of plastic zone of expansion of cavity were analyzed. The results show that the ultimate expansion pressure,stress and displacement fields and development of plastic zone vary with the different elastic moduli and strain-softening prop-erties. If classical elastic theory is adopted and strain-softening properties are neglected,rather large errors may be the result.     

基于腔QED的任意相干叠加态远程制备方案

运用A型三能级原子与相干态光场大失谐作用,在腔量子电动力学体系中制备原子与相干态光场的最大纠缠态,并以此作为量子通道在经典场辅助作用下远程制备可随意操控的相干态光场任意叠加态.经过计算,得出对于叠加系数为实数的相干态光场的叠加态,通过适当旋转操作,远程制备成功的概率是100%.最后讨论了实验上实现此方案的可行性和所具备的应用优势.     

气为声之本 气深声则鸣——声乐基础训练方法探析

在声乐基础训练中,气息起着至关重要的作用;气息,即声乐基础训练中的呼吸问题。“气为声之本,气深声则鸣”。有正确的呼吸,声音才有灵活性和流动性,反之就不可能获得好的共鸣位置和美的音色。     

灯头壳多工位拉深级进模设计

针对灯头壳零件的结构特点和生产要求,介绍了灯头壳多工位拉深级进模的结构设计要点和工作原理.提出了控制模具动作顺序的施力措施及设计方法,叙述了采用浮动式凹模在多工位拉深模中的作用.应用结果表明,该模具结构保证了灯头壳冲压变形趋向的稳定性和可靠性,此设计方法对薄壁件多工位拉深级进模的设计具有通适性.     

激光腔内单模场的强度和频率

本文用半经典理论研究激光腔内辐射场与原子的相互作用,得到了腔内单模场的强度随时间的变化关系以及频率牵引效应。     

漫谈声乐教学中关于怎样打开喉腔

完美的歌唱状态是在打开各种喉腔的前提下完成的,即通过"哈欠状态"、"口形状态"、"舌头状态"以及"管子"、"声门"状态的合理调整及系统地进行,以达到完美的课堂声乐教学.     

基于光纤连接三个光腔制备三原子W态(英文)

提出一种基于两光纤连接三个光腔制备三原子W态的方案。在此方案中,腔场的信息可以通过光纤进行传送,利用集成在光纤上的两个法拉第回转器阻止来自第二个和第三个腔场的反射。制备得到三原子W态时腔场处于初始时的真空态。由于原子与腔场之间是共振作用,耦合强度相对较大,能缩短所需的相互作用时间。     

A novel patchwork model used in lecture and laboratory to teach the three‐dimensional organization of mesenteries

Anatomy teaching is seeing a decline in both lecture and laboratory hours across many medical schools in North America. New strategies are therefore needed to not only make anatomy teaching more clinically integrated, but also to implement new interactive teaching techniques to help students more efficiently grasp the complex organization of the human body. Among the difficult anatomical concepts that students struggle to understand, the anatomy of the peritoneal cavity with its complex projections of peritoneum could benefit strongly from new learning aids. In this report, an innovative teaching tool is presented to engage students during both lecture and laboratory, and help them build three‐dimensional (3D) mental maps of peritoneal cavity. The model consists of a patchwork of mesenteries and gut made from colored cloth stitched together onto a T‐shirt to denote the origin and outflow of each peritoneum projection. As the lecturer wears the life‐size model, the students can appreciate the 3D organization of the peritoneal cavity on a living body. In addition, the T‐shirt model can be used in parallel with dissection to ensure a strong reinforcement of the spatial understanding of the peritoneal cavity. Anat Sci Educ. © 2012 American Association of Anatomists.     

通过对单原子的局域测量实现纠缠纯化

从两对原子的纠缠态出发 ,通过对单原子的局域测量 ,实现了纠缠的纯化 该方案不同于一般的通过联合的Bell基测量而实现纠缠纯化的过程 在此方案里 ,纯化包含两方面的含义 ,即四原子的纠缠态纯化为两原子纠缠态以及部分两原子纠缠态纯化为最大纠缠态     

通俗唱法的教学探索

本文对通俗唱法的气息问题、腔体打开问题、声音的统一、自我个性的塑造及情感表现等方面的教学方法提出自己的观点。