一种基于视觉模型的图像编码方法

提出了一种新的图像压缩编码方法，根据视觉的生理学和心理学特性，设计一组与编码图像无关且对人眼有意义的模块（视觉模块），利用这些模块对分块子图作匹配。该方法提供了与视觉相一致的较好的图像质量，压缩比与矢量量化相近。由于采用了简单的匹配算法，大大降低了编码的复杂性，此方法适于实时应用场合。     

一种基于视觉模型的图像编码方法

提出了一种新的图像压缩编码方法，根据视觉的生理学和心理学特性，设计一组与编码图像无关且对人眼有意义的模块（视觉模块），利用这些模块对分块子图作匹配。该方法提供了与视觉相一致的较好的图像质量，压缩比与矢量量化相近。由于采用了简单的匹配算法，大大降低了编码的复杂性，此方法适于实时应用场合。     

基于OPC技术的快速故障诊断实时数据平台设计

为了实现快速故障诊断,该文提出了1种利用过程控制中的对象连接与嵌入(OPC)技术实现分布式容错控制实时数据平台的设计方法,建立实时快速故障诊断模块,将故障诊断部分交给故障诊断模块来处理,将故障诊断的结果作为实时优化先进控制模块的输入和控制器重构或重组部分的依据,同时事件总线技术的应用提高了系统的响应时间.实验结果表明:该平台可以提高故障诊断的检测率和检测时间,为将容错控制成功地应用于工程奠定了基础.     

一种新的故障诊断专家系统

为了在新的环境中建造一个更加有效的故障诊断专家系统,在一般故障诊断专家系统的基础上,根据智能模拟器综合测试的特点和故障诊断要求,提出了一种新的专家系统知识分类和表示的方法．按照这种方法,利用ＨＰＶＥＥ（可视化工程环境）编程语言在Ｗｉｎｄｏｗｓ平台上建造了一个实用系统．该系统的仿真运行得到了很好的结果,故障诊断率达到１００％,诊断速度完全满足系统要求．     

S-CIELAB及颜色分级应用

根据人眼视觉特性，给出了Spatial—CIELAB系统分析方法．该方法首先利用由人类视觉空间响应特性确定的卷积核进行空间滤波，然后进行CIELAB处理．实验结果表明，该方法是可行的和有效的．     

基于机器视觉的气门摇臂安装检测系统设计

气门摇臂安装是汽车发动机生产工艺流程中一道重要的工序,摇臂安装是否到位、摇臂是否缺失以及气缸垫的有无检测主要通过人工完成,存在不稳定、高报错率和低速率等问题,需要利用机器视觉技术,开发摇臂安装视觉检测系统。根据具体的测试要求进行光学设备选型,利用“Visionpro”视觉开发软件设计气门摇臂安装检测程序。实际使用结果表明,该系统测量的精度在0．057mm以内,安装位置检测满足实际应用需求。     

齿轮故障诊断专家系统的研究与实现

基于齿轮故障诊断方法及大量实验数据，结合齿轮故障的判据，研究并建立了适应于齿轮故障诊断特点的齿轮故障诊断专家系统．本论文根据齿轮故障产生的机理及诊断方法，采用了框架及产生式知识表示形式，设计了齿轮故障诊断的专家知识库．通过规则集与规则集之间采用有知识搜索、规则集内部采用前向推理、规则前提和结论之间采用哈希算法的有机结合来实现推理机制。从而实现齿轮的故障诊断．利用该系统对齿轮试验数据进行分析、处理进而推理、诊断获得了满意的效果．     

制冷系统数据监测及故障诊断专家系统

在研究数据监测和专家系统的基础上，结合制冷领域的实际，开发了一个能显示压缩式制冷装置系统的专家系统．该系统只需要在制冷装置中采集必要的数据即能迅速地推算出装置的制冷量、能效比等重要的性能数据，并能诊断出制冷装置是否发生故障或潜在的故障，并能分析出故障的原因．主要介绍制冷系统的数据监测和故障诊断专家系统的组成模块，各模块的工作原理和它们的功能，讨论了系统推理机与知识库的相互作用关系．     

分布式驱动电动汽车紧急工况下稳定性控制

基于分布式驱动电动汽车具有各轮转矩可单独控制的特点,利用最优转矩分配方法提出其在危险工况下的稳定性控制算法.该算法分为稳定性判断与横摆力矩控制模块、滑移率计算与控制模块及各轮驱动力矩分配模块.稳定性判断与横摆力矩控制模块确定车辆稳定性状态,滑模变结构控制方法用于跟踪理想横摆角速度,输出期望的横摆力矩,确保非线性系统在受到外界干扰时保持稳定;滑移率计算与控制模块计算各轮的滑移状态,通过滑模变结构控制的方法进行各轮滑移率的控制;驱动力矩分配模块综合考虑轮胎力、地面附着等因素,根据横摆控制和滑移率控制的需求,分配各轮驱动力矩.利用联合仿真进行工况验证,结果表明:与各轮力矩平均分配算法相比,所提的力矩分配算法具有更优良的稳定控制效果.     

基于BP神经网络的变压器故障诊断方法

本文利用BP神经网络对变压器进行故障诊断。该方法以变压器油中特征气体的含量作为输入参数,输入到经过训练之后的BP神经网络,经过实际输出与期望的对比分析表明,采用该方法对变压器进行故障诊断是有效的。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

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