ATX电源的结构和常见故障分析

介绍了ATX电源的结构，对ATX电源常见故障进行了，指出了维修要点。     

高层建筑备用电源的设计探讨

简要介绍了电源的分类和高层建筑的常用供电方案，重点对不同类别的应急电源的标准、技术要求、用途和适用范围进行了比较，并对EPS应急电源系统使用中的一些问题进行了探讨。     

小电源并网系统中的备自投解决方案

首先对备用电源自动投入装置的基本动作原理进行叙述，进而对备用电源自动投入装置在小电源上网的特殊方式下受到的影响进行了分析，并提出了相应的解决方案。     

浅谈西安地铁二号线正线信号电源系统

地铁信号系统是控稍列车安全运行的装置，电源设备是保证信号系统正常运行的可靠保证。地铁电源系统包括信号电源屏．UPS（不间断电源）及蓄电池，向信号设备提供所需种类的稳定电源。文中主要针对信号电源屏、UPS原理进行分析，提出了西安地铁正线信号系统电源设备的配置方案。     

无线寻呼机房电源自动控制系统

研制了一种以单片机作为主机的电源自动切换系统。该系统可对电源进行自动检测、切换，对油机的水温、油压、油量等，随时进行监测控制、断电报警、打印输出，同时对远地数据终端可实行遥控操作，使电源的控制完全达到自动化。     

逆变电源中的谐波抑制

谐波抑制是变频电源的关键技术，主要研究逆变电源中的谐波抑制问题。在变频电源的逆变器上，应用多重化技术和PWM变频器中应用指定谐波消除技术，对不同方法的输出波形进行了数学分析，研究了波形的谐波分量和抑制结果，确定了变频电源中谐波的抑制方法。     

双向电流脉冲电源的设计

设计了一种应用于等离子体增强电化学表面陶瓷化技术(PECC)的双向电流方波脉冲电源，对电源的主电路结构及工作原理进行了详细的分析，并且针对其独特的负载特性，在设计电流闭环控制电路的同时，还设计了电压环控制电路，样机实验结果表明，基本上达到了电源设计的要求，满足了PECC技术的需要。     

分布式电源及其相关技术研究

由于大功率负载的需要，分布式电源系统得到越来越广泛地应用，其中多个电源模块并联供电的方式更加常用。就分布式电源及其相关技术进行了介绍，对各种均流控制方法进行了对比分析，总结了常见的问题。     

提高引信压电电源传输效率的方法研究

论述引信压电电源的特性，对压电陶瓷材料在发射时受压力下产生的能量进行了计算。结合火炮发射的膛压特点，进行了引信压电电源传输电路的设计，通过对压电陶瓷受压产生能量到存储能量的传输效率分析，提出了用多片压电陶瓷并联提高能量存储效率的方法。该方法可有效提高压电电源的传输效率。     

C4卫星接收机LNB18V供电电源分析

本文作者根据本人值机中发现C4卫星接收机LNB18V供电电源，经常出现对地严重短路，且完好无损，按一下电源按钮即可恢复正常的现象。引起对C4机（LNB）18V供电电源进行分析。本文报道找到了保护电路，提出了自己的看法，供同行们磋商参考。     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-