Structural Optimization of Lap Link Based on Elastoplastic Finite Element Analysis

As an important mooring arrangement in the na-val vessel, the lap link is used to join the tympanicring in lay day or for draught proofing,the capabilityof which is of vital importance to the safety of the ves-sel and personnel. However, existing lap link…     

会计三要素的实证研究

实账户、虚账户是西方会计对账户分类常用的一组概念。扩展内涵后的新定义如下:实账户是反映某类或某项资产、负债或所有者权益增减变动及结存情况的账户;虚账户是只反映某类或某项资产、负债或所有者权益在一段时间内全部或部分增减变动情况、但不反映其结存情况的的账户。按照实账户、虚账户理论,收入、费用属于所有者权益,其实质是所有者权益的部分增减变动额。实账户、虚账户理论实证了会计只有一个等式、三个要素的观点。     

试论中国民族传统体育的形成因素

我国民族传统体育属于民俗文化的范畴，其中蕴含着深厚的文化内涵。它在形成上虽然传承、沿袭着丰富的传统文化基因，保留了多元文化的传统个性，但在总体上受历史文化、宗教文化和地理环境三大因素的影响最深刻。     

牙体及周围组织有限元网格自动生成技术研究

由于牙体及周围组织的结构复杂性,自动生成它们的有限元网格很困难。为了解决这一问题,本文提出了一种针对复杂形体的有限元网格自动生成技术。     

Firmness evaluation of melon using its vibration characteristic and finite element analysis

INTRODUCTION Researchers continue to develop non-destructive methods to evaluate the effect of their impact on ag-ricultural products using high-tech methods. Non-destructive techniques sensing has been applied for obtaining fruit and vegetable quality index. Non-destructive method for measuring firmness us-ing sonic or vibration characteristics applied in pre-vious investigations was recently reviewed by Arm-strong (1989) and Liljedahl and Abbott (1994). The sonic vibration technique u…     

创建"职教哲学"框架结构的逻辑思考

随着教育结构的调整和教育资源的重新配置，职教已从普教中分离出来了，作为一种新兴的教育模式和体系，需要从哲学的高度上研究职教内在关系及规律等深层次理论问题，职教哲学正是适应这种需要而提出来的。本主要研究职教哲学的主体分、中介论和本体论等3个总体要素以及构成以上“三论”的9个项目要素和27个具体要素的界定、关系和否定生成形成，构建职教哲学的框架结构，探索职业教育的一般规律。     

Splitting PMMA with Mini Cutting Explosives

In order to improve the present aviation ejection escape system, the application of explosion cutting technique to aviation escape system is proposed to weaken the strength of canopy before ejecting it. A series of mini cutting explosives are designed to investigate the process of splitting PMMA plate. The phenomenon of spallation in PMMA is observed. The effects of different parameters of mini cutting explosives on the cutting depth are obtained. Consequently the appropriate material of half-circular metal covers, explosive types and the ranges of charge quantities are determined. On the other hand, the cutting process of aviation PMMA plate by mini cutting explosives is simulated by means of nonlinear dynamic analysis code LS-DYNA. In finite element analysis,Arbitrary Lagrangian Euler (ALE) algorithm is used to depict the fluid property of high energy explosives. Continuous damage material model is used to simulate the complicate dynamic damage behavior of PMMA due to explosion shock waves. Only sliding contact option is defined to fulfill the fluid-structure interaction between explosives and PMMA plate by distributed parameter methods. Phenomenon of spallation observed in the experiment is presented in the simulation. The relationship between the penetration depth of PMMA plate and charge linear density obtained by numerical simulation agrees well with experimental result.     

基于 COMSOL Mutiphysics的空芯光纤中氩气放电模拟仿真

为了研究空芯光纤中氩气的放电特性,利用有限元软件 COMSOL Mutiphysics 基于流体模型对长为50mm 空芯光纤中的气体放电过程进行仿真,得到氩气放电过程中等离子体的主要参数分布,如电子密度、离子密度、电势、空间电荷密度、电场强度等。同时分析了气压对放电过程的影响,结果表明,气压对气体放电的影响主要体现在电子密度与阴极侧的电场强度上,随着气压的逐渐增大,阴极侧的电场强度也随之增加,阴极侧电子密度则保持不变,但在空芯光纤中央区域,电子密度的增大较为明显。     

广告文化传播的隐性要素在实施中须注意的问题

广告文化的传播要素有两类:一类是基本要素又称为显性要素,它通过信源、信息、媒体信道、对象和反馈,扩大广告文化的氛围,强化广告的信息传播。另一类是隐性要素,它通过情感因素、心理因素、时空因素、文化背景、权威意识进一步拓宽广告文化的功能。广告显性要素的传播主要是受经济发展等客观因素的影响。而广告的隐性要素则更广泛地受到经济全球化以及各国经济环境、风俗习惯、民族心理、思维方式和价值观念等文化因素影响,导致世界各国广告隐性要素既有共性也有个性。本文就广告隐性要素在共性与个性使用中须注意的问题加以探讨,使广告隐性要素得以恰当的实施,使广告文化的传播达到有效的结果。     

磁阻效应实验的设计

锑化铟既作霍尔元件测量了磁感应强度，又作磁敏电阻研究了其阻值随磁场的变化规律。不仅揭示了霍尔效应和磁阻效应在半导体内同时存在的事实，使产生2种物理现象的微观本质表现得更为突出，而且还消除了由于使用其他方法测量磁感应强度时，被测点与锑化铟所处位置不同而造成的系统误差。