基于混合速率的TD—SCDMA系统容量

ＴＤ－ＳＣＤＭＡ作为中国提出的第三代移动通信系统，除支持话音业务外，还支持不同速率的数据业务。基于混合速率的情况下，对ＴＤ－ＳＣＤＡＭ系统的容量进行理论分析。     

MTD雷达中多普勒滤波器组的硬件实现

该文讨论了用横向滤波器实现ＭＴＤ雷达中多普勒数字滤波器组的硬件结构和实现方法。滤波器给采用乘法累加器（ＭＡＣ）和微程序控制器，具有高速、可编程及可实现自适应滤波等特点，具有较高的性能价格比。     

CDMA技术原理及在PCN中的应用特点

介绍码分多址（ＣＤＭＡ）技术原理及个人通信网（ＰＣＮ）基本思想，在与频分多址（ＦＤＭＡ）、时分多址（ＴＤＭＡ）技术比较后，说明了ＣＤＭＡ应用于ＰＣＮ中的优越性。     

主动的实时数据库管理系统研究

对实时数据库系统（ＲＴＤＢＳ）的若干方面进行讨论，其中突出地介绍了ＲＴＤＢＳ的基本特征及其与传统ＤＢＳ和实时系统（ＲＴＳ）的区别，提出了实时数据库管理系统（ＲＴＤＢＭＳ）要研究的主要问题，讨论了实时数据库事务的调度机制，并对主动数据库（ＡＤＢ）、主存数据库（ＭＤＢ）及其与ＲＴＤＢＭＳ的结合进行探讨。     

主动的实时数据库管理系统研究

对实时数据库系统（ＲＴＤＢＳ）的若干方面进行讨论，其中突出地介绍了ＲＴＤＢＳ的基本特征及其与传统ＤＢＳ和实时系统（ＲＴＳ）的区别，提出了实时数据库管理系统（ＲＴＤＢＭＳ）要研究的主要问题，讨论了实时数据库事务的调度机制，并对主动数据库（ＡＤＢ）、主存数据库（ＭＤＢ）及其与ＲＴＤＢＭＳ的结合进行探讨。     

农用三轮运输车动力输出装置的设计及机具配置的试验研究

农用三轮运输车动力输出装置的设计及机具配置的试验研究郑玉才，刘长荣，陈芳，杜青（河北农业技术师范学院农业工程系，昌黎，０６６６００）ＡＳＴＵＤＹＯＮＤＹＮＡＭＩＣＯＵＴＰＵＴＤＥＶＩＣＥＡＮＤＩＭＰＬＥＭＥＮＴＤＩＳＰＯＳＡＬＯＦＦＡＲＭＩＮＧＴＲＩ...     

现代码分多址（CDMA）技术的研究与探讨

现代码分多址（ＣＤＭＡ）移动通信系统被称为第三代移动通信系统，发展极其迅速，并且向多方面拓展，本文探讨了ＣＤＭＡ的技术理论，现状及特点，并对其在扩频方法，容量的计算等方面的机理作了研究，对应用也作了介绍。     

面对第四代移动通信的思考

移动通信技术在当今信息时代得到了突飞猛进的发展 ,移动通信已成为当代通信领域内发展潜力最大、市场前景最广的热点技术。目前全球已有的相当规模的移动通信标准有ＧＳＭ、ＣＤＭＡ和ＴＤ ＭＡ三大分支 ,每个分支都在抢占市场 ,全球无线技术各自为营 ,各厂商都在不断推出新技术 ,以迅速抢占行业标准的主导地位。尽管第三代移动通信（３Ｇ）标准比现有无线技术更强大 ,但也将面临竞争和标准不兼容等问题 ,人们开始呼吁移动通信标准的统一 ,以期通过第四代移动通信标准的制定来解决兼容问题。国际电信联盟（ＩＴＵ）目前已经开始研究制订第…     

周期性三对角阵方法与反复迭代法的比较

用三维圆柱坐标同位网格方法求解环形空间中的自然对流,用周期性三对角阵（ＣＴＤＭＡ）方法求解所形成的代数方程。同时,对圆周角方向的周期性用反复迭代方式来实现的方法提出限一种实施边界条件处理的方法,并比较了采用ＣＴＤＭＡ方法与采用反复迭代法的收敛速度。对环形空间内对流换热的计算表明,采用ＣＴＤＭＡ方法比采用反复迭代法收敛要快得多。     

现代码分多址(CDMA)技术的研究与探讨

现代码分多址（ＣＤＭＡ）移动通信系统被称为第三代移动通信系统，发展极其迅速，并且向多方面拓展．本文探讨了ＣＤＭＡ的技术理论、现状及特点，并对其在扩频方法、容量的计算等方面的机理作了研究，对应用也作了介绍     

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