关于HFC双向网建设中的几点经验

HFC是一种新型的宽带网络,采用了光纤与同轴电缆混合组成了传输网络的物理结构,它比较合理有效地利用了当前的先进成熟技术。文章主要介绍了在HFC网络建设过程中的设计及噪声问题的解决方法。     

有线电视与信息高速公路

本文通过对信息高速公路的介绍,从有线电视的特点出发,说明有线电视能够成为中国信息高速公路重要组织部分的优势;提出了江西铜业公司信息高速公路的网络基础——有线电视宽带综合信息网的建设方案.     

宽带板坯在线计量系统的设计与应用

简要介绍了宽带板坯在线计量系统的设计与应用，成功地将电视监控、光纤通讯、声光报警等先进技术应用于计量系统之中。     

蓝宝石光纤温度传感器测温上限的瓶颈分析及解决方案

通过与热电偶、非接触式辐射测温仪的对比分析,指出基于黑体辐射原理的蓝宝石光纤温度传感器在某些特殊测温场合的不可替代性.介绍了国内蓝宝石光纤温度传感器的研究情况,分析制约其应用和发展的测温上限瓶颈,最后提出解决该问题的初步方案.实验证明该方案能够实现高达2 700℃的温度测量,1 000℃以上最大稳态误差不超过50℃.     

企业信息化建设的框架要素

企业信息化建设的框架要素包括网络基础设施、数据资源、智能卡、安全认证机制、清算体系及组织体系与人才队伍。( 1 )网络基础设施一一基于有线和无线通信的网络。在光纤同轴复合网、宽带城域网和高速宽带无线网络基础上 ,构建信息网络平台。 ( 2 )数据资源一一基于业务流的真实数据。通过各种业务流的分析、梳理和互联互通 ,建设准确、完整、实时更新的企业数据库。( 3)智能卡——在电子商务等各类信息化建设和应用的基础上 ,最终以智能卡为载体实现所有的管理和服务。( 4 )安全认证机制一一安全认证机制是电子商务发展的核心和关键问题。…     

超宽带荧光特性的铋离子掺杂玻璃研究进展

密集波分复用（DWDM）技术的快速发展和应用，对光纤放大器的宽带特性也提出更高的要求。最近有研究发现，铋离子在某些玻璃基质能产生发光中心波长位于1．3μm附近、荧光半高宽（FWHM）达300m左右、荧光寿命可达600μs的近红外宽带发光，使得铋离子掺杂的玻璃基质有可能成为未来全波段光纤放大器增益介质。近3年来研究者围绕着铋离子在不同玻璃基质的发光特性，以及铋离子发光机制进行了大量的研究，取得了很大的进展。本文对铋离子掺杂的玻璃发光研究进展进行了综述。     

锡矿井下光纤光栅温度测量用掺铒光纤光源研究

本文分析了铒纤长度、泵浦功率对ASE光谱宽度及平坦度的影响,通过模拟得到10m最佳光纤长度及100mW的最佳泵浦功率,进一步设计了增益平坦滤波器损耗参数,根据设计结果搭建光路,得到较为平坦的ASE光源输出,且平坦度达到了±1.5dB,接入频率800Hz可调滤波器,获得1526-1565nm完整的光谱可调信号,完成了可调掺铒光纤光源的研究,得到锡矿井下开采所需光纤光栅温度测试仪的宽带光源。     

舰载光纤陀螺捷联惯导系统传递对准技术研究

本文提出了基于中高精度光纤陀螺捷联惯性导航系统传递对准设计方案,以"速度"+"姿态"为量测量,建立了卡尔曼滤波器误差模型和系统观测模型,完成了传递对准算法设计.通过仿真和船载动态试验,验证了传递对准方案可行性;船载试验结果表明光纤陀螺捷联惯导系统传递对准精度较高,技术指标满足工程应用要求.     

向全业务网络迈进

今天我讲的内容主要包括三部分内容,首先和大家分享一下三网融合面临的挑战和发展趋势:接下来介绍一下我们公司提出来的三网融合整体架构方案. 1 三网融合面临的挑战和发展趋势 1.1 发展基于宽带的全业务 网络发展跟每个老百姓的生活是紧密相关的.宽带普及率每提升10%,可以直接带动GDP1.4%,投资宽带能够带来10%回报,宽带普及率每增加1%,就业率上升0.2%至0.3%.     

有色冶金企业供电系统集中监控方案设计与应用

基于光纤通讯环网、计算机网络通讯技术和DF8002调度自动化系统,设计出企业供电系统集中监控方案,实现了企业供电系统的运行状态实时监控、电气参数实时监测、事故异常报警处理、运行分析等综合功能.     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。