高压水切割机器人系统设计

本文介绍了一种为实现复杂形状工件的精确水射流切割,本文设计了基于ABB六自由度机器人的水射流切割工作站,介绍了系统的硬件组成和工作原理。工作站以机器人控制柜为核心完成系统管理和工件切割。本文讨论了汽车仪表板切割程序结构和切割工艺。实践证明该系统性能稳定,能满足汽车仪表板切割要求。     

发动机的曲轴转速方程及其近似解

从活塞发动机的动力分析中得到本文中的微分一积分方程(4),其中α为曲轴转角,θ为角速度的平方,而ε<<1为总等效转动惯量的倒数。本文利用压缩映象原理和摄动方法证明了所得方程解的存在性和唯一性,并给出了这个解的渐近展开。     

东北方言词语拾零(之五)

本文是《东北方言词语拾零(之四)》的续篇,是对《简明东北方言词典》(许浩光、张大鸣编)和《东北方言词典》(马思周、姜光辉编)的补充。凡这两部词典所收并且对词语释义也是我们所同意的,本文不收;本文收录以上两部词典未收或对词语的释义我们认为是不合理的词语。为了印刷方便,本文用汉语拼音注音;M、N、W、X为汉语拼音方案的音序;/前后为可替换成分;()内为可出现成分;*为不说。本文作者为黑龙江人。     

基于实时电价的含电动汽车微电网两阶段优化调度

为解决大量电动汽车无序充电对微电网负荷曲线产生新的峰值或峰上加峰等现象,提出了V2G(vehicle to grid)下两阶段优化方法,第一阶段考虑实时电价的前提下以满足用户充电需求为目标建立电动汽车有序充放电模型,第二阶段以微电网综合成本最低和微电网出力波动最小为目标,确定电动汽车有序充放电功率。为了解决多目标优化的问题,本文采用改进型多目标粒子群算法（IMPSO）。为验证本文方法的有效性,用蒙特卡洛法模拟某微电网内电动汽车的充电需求后采用本文方法优化,结果证明本文调度方法降低微电网经济成本和出力波动的同时,降低了用户成本。     

关于CORS共享的技术探讨

本文以CORS共享的相关技术问题为研究对象,分析CORS系统建设的起点、阐述了CORS共享网络体系结构,并提出了CORS资源共享的资源建设机制。本文研究旨在为CORS共享的技术发展提供一些启发和借鉴。     

航空活塞发动机振动故障分析

本文以中国民航飞行学院使用的莱康明发动机所出现的振动故障为研究基础,结合收集到的国内外其他莱康明发动机出现的振动故障,就振动故障的预防给出维护和使用应注意的事项。借此希望本文能为相关维护人员提供有益的参考,降低莱康明发动机震动故障率,对维护工作和使用有所启发和帮助。     

三维弹塑性分析的弹性试验模型

本文以弹塑性力学的模型理论和塑性力学形变理论为基础,提出一个三维弹塑性分析的弹性试验模型。以已知的三维弹性应力状态为原始数据,用本文所介绍的模型,可以将之转换为对应的弹塑性解答。     

基于MapGIS和ArcView的矢量化方法

本文以土地利用现状图和地形图为例,介绍了以AutoCAD为中转工具的基于MapGIS和ArcView的矢量化方法。     

价值工程在工程招投标中的应用

本文以某工程材料采购为例,通过分析国内工程招投标中的问题,研究价值工程如何运用于国内工程的评标。本文还提出将价值工程功能定义的定性指标转化为定量指标的建议,并且运用价值工程技术改进招投标流程,为择优评标和投标方案创造提供了全新的方法。     

东北方言词语拾零(之四)

<正> 本文是《东北方言词语拾零(之三)》的续篇,是对《简明东北方言词典》(许浩光、张大鸣编)和《东北方言词典》(马思周、姜光辉编)的补充。凡这两部词典所收并且对词语释义也是我们所同意的,本文不收;本文收录以上两部词典未收或对词语的释义我们认为是不合理的词语。为了印刷方便,本文用汉语拼音注音;P、Q、R、S 和 T为汉语拼音方案的音序;/前后为可替换成分;()内为可出现成分;※为不说。本文作者为黑龙江人。     

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