矿用自卸车半车半主动悬架俯仰数学模型的建立

悬架系统是车辆系统中重要的组成之一。悬架系统分为被动悬架、半主动悬架、主动悬架。悬架系统性能的优劣对车辆的乘坐舒适性、操纵稳定性、平顺性、车辆安全性都有重要影响,我国矿用自卸车悬架系统多为被动悬架,矿用自卸车半主动悬架系统的研究相对较少,因此精确的建立矿用自卸车半主动悬架系统的数学模型对矿用自卸车半主动悬架系统的研究具有非常重要意义。该文针对某重型矿用自卸车悬架系统进行了力学分析,根据经典力学定律推导出了矿用自卸车悬架系统的部分力学微分方程,为进一步研究矿用自卸车半主动悬架系统提供了理论基础。     

大吨位矿用自卸车操纵稳定性仿真分析

利用软件仿真,研究某型大吨位矿用自卸车分别在空载和满载情况下,表征操纵稳定性的各状态参量的瞬态响应与稳态响应情况.计算前、后轮胎,悬架系统等主要结构参数变化时,车辆各状态参量的响应情况,得出这些结构参数对矿用自卸车操纵稳定性的影响.针对具体车型分析影响结果并提出改进意见.     

浅析Ⅵ视觉识别设计中的色彩

在当今竞争激烈的市场环境下,Ⅵ视觉识别设计中的色彩,即企业标准色彩,作为Ⅵ设计的重要组成部分,成为了当今企业品牌必不可少的竞争动力.本文从Ⅵ视觉识别设计着手,分别从色彩的概述、色彩的情感象征以及色彩设计的运用三个方面对色彩进行了分析,从而能为Ⅵ视觉识别的系统设计起到一定的借鉴作用.     

大型矿用自卸车交流传动系统的研制

针对电动轮自卸车的特殊工况,研制了全国产化交流传动系统.介绍了控制系统的基本参数和性能,该系统采用转差矢量控制的控制策略和基于空间矢量（SVPWM）的调制方式.试验表明：该系统启动转矩大,转矩响应迅速,牵引制动平稳可靠,满足大型矿用自卸车交流传动系统设计要求.     

基于不确定性和隔代遗传的矿用车平顺性优化

建立了八自由度的矿用自卸车整车数学模型,并基于动态仿真模型构建设计变量和不确定变量与目标函数之间的近似模型,采用双层嵌套的隔代遗传算法,内层在不确定域上求解目标函数区间,外层对设计变量寻优,对该模型进行平顺性优化.最后与确定优化的结果进行比较,得出了不确定性优化的优越性.     

非线性油气悬架的矿用自卸车纵倾性能优化

由于矿用自卸车的悬架结构形式特殊,研究车辆抗制动纵倾性的传统分析方法并不适用于解决其“制动点头”问题.鉴于此,本文以中性面和力矩中心为基点,进行悬架平跳试验仿真和整车直线制动仿真,得到了车轮着地点运动轨迹、悬架纵向角刚度等相关参数,进而得到了整车的纵向稳定性系数.并以其为目标函数,以悬架参数为优化变量,对矿用自卸车纵倾性进行优化.优化后的仿真结果表明,悬架的纵向稳定性系数提高了19.04％,前悬架的点头量和车身俯仰角则分别减小了18.23％和15.25％.该矿用车自卸车的“制动点头”现象得到明显改善.     

基于形状文法的工程自卸车前脸造型设计研究

运用形状文法的文法关系和设计规则,对我国某自主品牌工程自卸车前脸造型进行再设计。通过分析形状文法在工业设计中的应用现状,从其文法关系出发,结合工程自卸车前脸的造型特征,分析其正面造型各功能分区图形运算规律,关键造型特征线的运算方法。归纳整理形状文法在工程自卸车前脸造型设计中的应用方法,结合我国某自主品牌的企业特征,为该品牌工程自卸车设计了一款前脸造型,可为其在较短时间内产生新的前脸造型设计创新发展提供一定的指导和参考作用。     

基于色彩心理学的呼吸器人性化设计

以人们对现实生活中色彩视觉经验的积淀为启示,分析了色彩的隐喻特征及色彩心理的基础、内涵,并结合日常设计中对色彩心理学的运用实例论述了色彩心理学的价值,提出了色彩作为形式要素中最直观最具情感性的元素在体现产品审美视觉效果上具有决定性作用,能增强产品语意,并论述了如何运用色彩心理学提升设计的人性化.     

基于情感体验的康复辅具产品色彩设计研究

色彩与情感之间具有紧密的关系,基于情感体验开展康复辅具产品色彩设计工作,对于满足康复辅具产品用户的情感需求、提升康复辅具产品用户的满意度具有重要意义。本文在对老年人及残障人群情感特征做出分析与论述的基础上,以实现康复辅具产品色彩与用户情感需求为出发点,对康复辅具产品色彩设计流程进行了研究与探讨。     

宽体矿用自卸车驱动后桥桥壳有限元分析

为了解决宽体矿用自卸车驱动后桥桥壳在使用破话失效问题,研究宽体矿用自卸车驱动后桥桥壳在典型工况下整体应力、变形分布情况,发现驱动桥桥壳存在的较大安全裕度,为后续针对桥壳结构的优化提供一定指导意见。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-