Crashworthiness simulation and improvement design of auto-body based on finite element mehtod

One developing commercial vehicle was simulated on crashworthiness using the nonlinear finite element method. The deformation of the auto-body, the movement of the steering wheel and the dynamic responses of the occupant at the initial velocity of 50 km/h were studied. The results show that the design of the vehicle could be improved on structure and material. The frontal longitudinal beam, the main energy-absorbing part of the auto-body, was optimized on structure. The data of the simulation predict that the hinge of the engine hood would fracture during the crash. The failure of the engine hood hinge would be a danger to both the driver and passengers. Then the problem was solved by changing the engine hood and hinge on structure and material. Simulation results also show that applying new material and new manufacture techniques could improve the crashworthiness of the vehicle greatly. These improvement methods are valuable to the virtual design of vehicles.     

蜜蜂眼中的花朵

如果人类眼睛看到的花儿只有一种颜色，比如说黄色．那么在昆虫的眼中，这些花儿又会是什么颜色呢?这次我们就借助蜜蜂的眼睛，带你进入一个别样的颜色世界。     

通向嗅觉之路

鲜花的芬芳，臭鸡蛋的腐味，不同的气味让我们对物质有着或喜爱或厌恶的感受。人类的嗅觉虽然无法与有些动物媲美，但这也足以令我们受用无穷了。     

《孟子》动词“为”的配价研究

采用配价的方法 ,对《孟子》高频动词“为”的五个常见的义项 ,从配价格式、主要价语的构成以及义项之间的差异和联系等方面 ,进行了定量和定性的分析     

浅谈桥梁的设计目标

从安全性、使用性能、易施工性、经济性和桥梁美学5个方面阐述了桥梁的设计目标，并提出了一些保证实现桥梁设计目标的措施。     

试谈小乘佛教对德宏傣族习俗的影响

居住在德宏地区的傣族，普遍信仰小乘佛教。广大的傣族群众对小乘佛保持着最虔诚的感情。在一定程度上小乘佛教已经成为傣族人民的主要精神支柱。小乘佛教的教义、教规、禁忌影响着傣族社会生活的各个领域，并义促使傣族思想意识，日常习俗了发生了变化。本就小乘佛教对德宏傣族习俗所产生的影响作一下探索。     

我国的马化石

生活在远古时代的马类,从系统分类上可分为1个科,下属3个亚科:始马亚科、安琪马亚科及马亚科。在我国这3个亚科都有化石代表,但前两个亚科的化石材料极少。我国最早的始马类化石代表是发现于湖南衡阳的原厚脊齿马和发现于山东的原古马,二者的时代是早一中始新世(距今大约5300～4000万年)。安琪马亚科的化     

无伸缩缝预应力T梁桥梁高优化设计

结合福建省永春县上坂大桥的结构设计与桥梁通用设计图纸,采用桥梁设计软件,建立不同跨径和梁高的两等跨无伸缩缝预应力T梁桥模型;提出一个同时考虑受力性能和造价的优化设计方法;根据该方法得出各种常用跨径的无伸缩缝T梁桥最优的主梁高度,为无伸缩缝桥梁的优化设计提供参考.     

应用人工神经网络方法评定作物生产系统中指标的权重

通过关系协调权计算方法与Madaline网络方法的比较发现，直接将Madaline网络方法应用在作物生产系统内的权重分析上不能得到很好的效果。经过对Madaline网络激励函数和误差函数的改革，使其对空间的划分更敏感，另外可避免网络在学习过程中陷入“麻痹”状态和产生振荡。使之更能适应作物生产系统内的权重分析，而且具有一定的实用意义。     

Modeling Multisource-heterogeneous Information Based on Random Set and Fuzzy Set Theory

This paper presents a new idea, named as modeling multisensor-heterogeneous information, to incorporate the fuzzy logic methodologies with mulitsensor-multitarget system under the framework of random set theory. Firstly, based on strong random set and weak random set, the unified form to describe both data （unambiguous information） and fuzzy evidence （uncertain information） is introduced. Secondly, according to signatures of fuzzy evidence, two Bayesian-markov nonlinear measurement models are proposed to fuse effectively data and fuzzy evidence. Thirdly, by use of ＂the models-based signature-matching scheme＂, the operation of the statistics of fuzzy evidence defined as random set can be translated into that of the membership functions of relative point state variables. These works are the basis to construct qualitative measurement models and to fuse data and fuzzy evidence.