车间生产过程仿真系统中的仿真控制语言研究

介绍了车间生产过程仿真系统用于定义仿真环境中实体行为的仿真控制语言,这种语言可以有效地定义仿真中仿真实体的行为规则,通过调用系统接口函数,对仿真控制语言进行解释执行,完成系统实体对象的行为,主要讨论了仿真控制语言的设计思想和实现机制,提出了仿真控制语言的编译和解释的系统框架结构。     

生产系统的SLAMⅡ语言仿真

该文介绍了广泛使用的ＳＬＡＭ仿真语言及其建模框架，并通过用ＳＬＡＭⅡ仿真一个实际的生产系统的例子，给出了相应的网络模型和仿真结果分析，指出使用ＳＬＡＭ语言仿真生产系统具有周期短，使用方便、工作效率高等优点。     

用面向对象的框架语言实现离散事件仿真

利用面向对象的框架语言实现了知识基离散仿真模型的表达、推理和实施。首先用面向对象框架语言构造仿真模型类库，然后用活动循环图将仿真类库连接成仿真的概念模型，最后通过推理产生仿真模型的行为。这种基于知识的仿真建模方法能快速有效地实现复杂系统和病态结构系统的仿真。     

高级语言级仿真及其在嵌入系统中的应用

说明了高级语言级仿真的概念,介绍了使用高级语言级仿真的方法,同时对几种嵌入式系统的仿真方法进行比较,最后给出了一个例子说明如何进行高级语言级仿真.     

利用VHDL语言实现直接数字频率合成

介绍了DDS技术的组成原理及特点，利用VHDL语言在Altera公司的FLEX10K系列器件上实现了DDS系统，通过MAX plus Ⅱ和Matlab演示了仿真结果．     

基于VHDL语言的数字系统的设计

本文介绍了VHDL语言及其基本特点和VHDL语言在数字频率计中的具体应用,说明了用VHDL语言设计数字系统的方法,并给出了仿真波形图。     

Matlab语言的编程和可视化仿真

通过对两个实例——分别应用Matlab自带的m语言对某离散系统单位抽样响应进行编程分析,应用Mat-lab语言的可视化仿真环境simulink对某一模拟工程系统进行仿真运行的过程介绍,说明计算机仿真软件matlab在信号处理和控制系统设计中显示的高效简洁的编程优越性和动态直观的仿真优越性。     

基于MATLAB语言仿真的自动舵模糊控制系统

论述了一种基于 MATLAB 语言的自动舵模糊控制仿真系统,通过 MATLAB 语言中SIMULINK 模块和模糊控制工具箱实现自动舵模糊控制仿真。实践证明,该方法具有效率高、实用性强的特点。     

基于Simulink与M语言的捷联惯导系统仿真方法研究

在研究捷联惯导系统的导航解算算法时,经常需要对算法进行仿真以测试算法的性能.比较研究了在Matlab中实现捷联惯导系统仿真的两种方法:一种是采用M语言编写各功能函数,通过函数调用的方式实现捷联惯导系统的仿真;另一种是采用Simulink模型与M语言结合的方式实现捷联惯导系统的仿真.分别用这两种方法进行了1 h的导航解算仿真,仿真结果表明,这两种仿真方法均具有很高的仿真速度和仿真精度,都能满足工程应用的需要,与第一种方法相比第二种仿真方法可以方便地设定仿真时间、惯性测量组件的采样频率,也可以在仿真中暂停或停止仿真,具有更好的可操作性.     

基于VHDL语言的CISC-CPU系统设计

应用XILINXISE软件开发平台,采用自顶向下的设计方法及VHDL语言描述开发设计了CISC-CPU系统.将CISC-CPU划分成九个基本功能模块,进行编译综合及仿真,给出了指令执行的仿真波形,验证了CPU指令的功能.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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