客车侧翻碰撞中安全带对乘员损伤的影响分析

参照欧洲ECE R66法规要求,建立客车侧翻仿真模型及其乘员约束系统模型。利用LS_DYNA软件对客车侧翻碰撞试验和客车座椅动态试验进行模拟分析,并与试验结果进行对比,结果表明,有限元模型具有较高的精度。将4个HybridⅢ50%男性假人模型放置在客车最薄弱的车身段座椅上。对客车侧翻过程中,3种约束条件(无安全带、两点式安全带和三点式安全带)的乘员损伤情况进行分析。研究结果表明:无安全带约束时,假人头部和颈部将受到严重损害;两点式安全带和三点式安全带对于所有假人颈部及胸部的保护效果相近;两点式安全带能有效降低大部分假人的头部损伤风险,但碰撞侧外侧假人头部损伤值仍较高。     

汽车电动燃油泵性能检测系统

针对燃油泵输油性能传统测试方法的弊端，研究出一种全新基于单片机控制的车用电动燃油泵性能检测系统，并运用计算机技术，对连续检测过程的多种操作自动进行数据采样、传输存储、处理加工、动态显示等智能控制，实现了燃油泵生产产品大批量的智能质量检测。     

液压往复密封试验及数据监测系统的研究

介绍了进行中、高压往复密封产品性能试验的标准试验台总体结构及计算机数据监测控制系统的设计；对试验装置、试验环境、约束条件及主要试验方法进行了讨论，并给出了具体试验步骤和数据检测及处理方法。     

液压往复密封试验及数据监测系统的研究

介绍了进行中、高压往复密封产品性能试验的标准试验台总体结构及计算机数据监测控制系统的设计；对试验装置、试验环境、约束条件及主要试验方法进行了讨论，并给出了具体试验步骤和数据检测及处理方法．     

基于PSO-LSSVM的复杂试验不确定度分析

提出一种结合粒子群优化（PSO）算法和最小二乘支持向量机（LSSVM）模型的复杂试验不确定度分析方法。以汽车座椅的安全带拉伸试验为对象,研究汽车座椅安全带拉伸试验的主要影响因素及其概率密度函数参数,采用拉丁超立方方法进行试验设计,并进行安全带拉伸试验有限元仿真。运用PSO-LSSVM建立安全带拉伸试验的数学模型,并与BP（back propagation）神经网络建立的数学模型进行对比,结果显示PSO-LSSVM数学模型有更高的预测精度,满足后续不确定度评定要求。进一步采用蒙特卡罗方法实现安全带拉伸试验的不确定度评定,并以国家标准规定的方法进行参考,研究结果表明,该方法可应用于各种复杂试验不确定度分析中。     

正面碰撞中安全带预紧方式对驾驶员损伤影响研究

采用MADYMO软件建立了丰田Yaris正面碰撞下驾驶员侧约束系统仿真模型,并通过与实车试验数据进行对标分析验证了该模型的有效性;然后基于验证过的模型研究了正面碰撞中不同安全带预紧方式对驾驶员的损伤影响;同时,在配备预紧限力式安全带的基础上,分析了卷收器预紧、带扣预紧以及双级预紧安全带对假人的保护效果。仿真结果表明,预紧限力式安全带对假人的保护效果优于仅预紧式、仅限力式以及普通三点式安全带,而且在预紧量相同的情况下,卷收器预紧与带扣预紧对假人损伤影响无明显差异,但双预紧式安全带可有效降低假人头部和胸部损伤值。     

卷烟质量全方位关联分析体系的研究

卷烟产品的常规检测数据主要涵盖三个方面的质量信息:物理指标、主流烟气指标、感官质量指标。本项目选取合适的统计工具,有效地利用这些常规检测数据,构建一个科学的卷烟质量关联分析体系,对数据进行归纳分类,梳理分析,研究各质量特性的相互关系,从中找出规律,得出科学的结论,为稳定产品质量服务,为企业决策提供参考。     

连续箱梁刚构桥静载试验与分析

桥梁静载试验是桥梁质量检测中不可缺少的重要手段,通过对非洲金沙萨至马塔迪公路MPOZO大桥静载试验,详细介绍了试验荷载及测点的布置情况和测试结果,并对试验结果和MPOZO大桥的性能进行了分析,为大桥的运营和养护提供了基础数据,并可供同类桥梁检测参考。     

基于模糊增强的安全带佩戴识别方法

为了弥补目前安全带佩戴提示系统的不足,提高驾驶员安全带佩戴率,提出一种基于模糊增强的安全带识别方法。该方法首先对采集到的驾驶员图像进行光补偿处理,采用自定义的Canny算子进行边缘检测,再使用Hough变换对处理过的图像进行直线检测和初步判断,对于没有检测到安全带的图像进行模糊增强,采用最大类间方差法选择最佳阈值进行图像分割得到二值化图,再进行直线检测并得到最后结论。实验证明,该方法有效地完成对驾驶员安全带佩戴情况的识别,具有较高的准确率。     

正面碰撞约束系统仿真和设计参数研究

提出基于安全气囊织物进行经纬向拉神试验和画框剪切试验,研究该材料的各向异性特性.建立包括安全气囊、可压溃转向柱、带可预紧和限力器的三点式安全带等的正面碰撞约束系统模型,并将仿真结果与实车试验结果对比和验证.分别从定性和定量分析两个角度,深入讨论约束系统设计参数对假人伤害评价指标的影响,以用于指导约束系统的碰撞安全性能设...     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the