电力线通信(PLC)技术

本文主要介绍了电力线通信（PLC）的最新发展和电力线通信的优缺点，强调了电力线信道存在的噪声和衰减，以及克服这些不利因素的解决方案。介绍了电力线通信的技术要素，着重叙述了扩频通信（SST）技术和正交多载波调制（OFDM）技术的原理及它们对各种噪声和衰减的抵抗能力。     

振冲碎石桩在公路软土地基处理中的应用

介绍在采用振冲碎石桩加固软弱土地基的工程中，根据加固地基承载力标准值、加固前地基承载力、土的压缩模量等参数进行桩的设计，以及在施工中正确选择施工参数的体会和施工中的注意事项。     

电力线上网在西藏的应用前景

本文通过对电力线上网的原理、实现方式、优缺点等的介绍,探讨了这项技术在西藏的应用前景.     

鸡冠山镁石矿业项目区水土流失预测

在说明水土流失预测所需基本参数的基础上,采用类比与数学模型相结合的方法对工程扰动原地貌及损坏水土保持设施面积、项目弃渣量、可能造成的水土流失量进行了预测,并对水土流失可能造成的危害做了分析。     

台吉营风力发电场新建工程水土流失预测

在说明台吉营风力发电场新建工程水土流失预测所需基本参数的基础上,采用类比与数学模型相结合的方法对工程扰动原地貌及损坏水土保持设施面积、项目弃渣量、可能造成的水土流失量进行了预测。     

锡多金属硫化矿新型跳汰床石应用试验研究

跳汰机是选厂生产中常用的一种重选设备,跳汰机的床石类型很大程度上决定了跳汰选别指标的好坏。文章主要考察了两种不同类型床石在中、细粒跳汰机上的生产应用情况。试验结果表明,新型床石对中跳选别效果影响显著,对细跳选别效果影响不大。     

Steady creep bending in a beam with random material parameters

A statistical analysis is presented for steady creep bending in a beam, where the material parameters are random processes along the neutral axis arising from random fluctuations in temperature and imperfection density. Analytical and numerical results are presented for the statistical properties of the normal stress and lateral velocity. It is found that whereas the normal stress shows very little random fluctuation the lateral velocity is highly random. The statistics of the lateral velocity generally show a significant dependence on the nominal value of the creep power and on the position along the neutral axis.     

“长效路界石”的发明与应用

道路设施的安全性,直接关系到人身和财产的安全。研发先进的道路安全设施,对保障公民出行安全,促进社会发展,具有重要现实主义。本文简述了运用人一车一路系统的更新换代产品—"长效路界石"项目的可行性和应用前景。     

碎石桩加固湿地地基施工工艺

湿地地基是铁路工程地质中较为少见的一种软基类型。青藏铁路我队施工的管段内共计有2．27km路基修筑在湿地地基上，处理范围大，处理措施各异。本文将介绍其中的一种处理措施一碎石桩处理施工工艺。     

NTCIR-2 as a Rosetta stone in laboratory experiments of IR systems

This paper presents a laboratory based evaluation study of cross-language information retrieval technologies, utilizing partially parallel test collections, NTCIR-2 (used together with NTCIR-1), where Japanese–English parallel document collections, parallel topic sets and their relevance judgments are available. These enable us to observe and compare monolingual retrieval processes in two languages as well as retrieval across languages. Our experiments focused on (1) the Rosetta stone question (whether a partially parallel collection helps in cross-language information access or not?) and (2) two aspects of retrieval difficulties namely “collection discrepancy” and “query discrepancy”. Japanese and English monolingual retrieval systems are combined by dictionary based query translation modules so that a symmetrical bilingual evaluation environment is implemented.     

广州地铁三、四号线环控柜进线开关在线监测改造方案

通过可编程控制运用,采用现场总线,将环控柜进线开关及母联的运行状态实时反应在上位机人机界面上。     

Nychthemeral rhythmicity of urinary copper levels in healthy Indians and renal stone formers

Nychthemeral rhythmicity of urinary copper (Cu) was studied in 40 clinically healthy volunteers and 35 renal stone formers. A marked diurnal rhythm was noticed in urinary Cu levels in healthy subjects with maximum excretion at 0000 to 0600 hr followed by a progressive fall during the rest of the period reaching minimum between 1200 to 1800 hr in males and 0600 to 1200 hr in female volunteers. Similarly, all stone patients exhibited a definite rhythm in urinary Cu with significant amplitude and acrophases at 2145 hr for males and 2141 hr for female stone formers. However, there was no difference in mean 24-hr Cu excretion in male and female stone formers, whereas a significant change was observed in case of healthy subjects. Urinary Cu was found to be significantly increased in renal stone formers in comparison to healthy controls of either sex attributing a significant role of this overlooked trace mineral in the crystallization and/or activation of either of the process of stone formation in the renal tubules.