电磁兼容性及其对产品、贸易和通信的影响

简述电磁兼容性的重要意义及其对产品、贸易和通信的影响。     

电磁兼容性及其对产品、贸易和通信的影响

简述电磁兼容性的重要意义及其对产品、贸易和通信的影响.     

Telecommunications Systems Modeling in the Laboratory

This paper describes a laboratory developed to accompany a course in communications theory. The laboratory program is based on the use of building block modules, corresponding to the standard elements found in communication systems. The use of such modules enables the students to model complete systems without becoming involved in detailed problems of circuit design. The module system is described and its use in typical experiments is discussed.     

Telecommunications network design using modeling and simulation

This paper is intended to help instructors integrate the use of computer simulation methodologies in senior and graduate level courses in telecommunications and computer networks design. It outlines how the course and its laboratory can be organized, and recommends a set of projects, textbooks, and articles that could be used in the course. This paper reviews the obstacles that for years have prevented the successful use of computer simulation in the design and management of communication networks and offers strategies to overcome them     

Telecommunications applications of ferroelectric liquid-crystalsmart pixels

Ferroelectric liquid crystal over silicon smart pixels offers potential advantages over conventional electronic and waveguide approaches to telecommunications switching. The role of such smart-pixel architectures in space/wavelength optical interconnect and in high-performance ATM switches based on interconnection of optically accessed memory is discussed     

Merging Forces: An Analysis of the Convergence of the Utility and Telecommunications Industries

Though many by now find talk of convergence to be overrated and premature, an effort by the Consumer Energy Council of America to sound out 60 key players is helpful in setting the framework for policy debates.     

智能电网对通信的影响与需求

文章立足智能电网对通信发展提出的新需求,分析了通信系统建设、管理现状及存在的问题,指出提升骨干网支撑能力、转变通信运维方式、规范配用电通信网建设的重要性;提出建设智能光网络、第二张通信网、通信专用高速数据平台、新型交换网及通信综合监管平台等的必要性;对开展状态检修、发挥标准化规范引领作用、完善通信管理与运维体系、打造专业运维队伍等提出建议。     

Application of Telecommunications in Petroleum Producing Operations

Increasing demands for energy from the petroleum industry with added ecological protection presents one of the greatest challenges of the 1970's. This situation demands high production efficiency and consolidated operations. To meet these objectives, extensive automation and data information systems are needed. In perspective, these become part of telecommunication systems-a new function in producing operations.     

移动通信大楼的电气安全及抗干扰问题

阐述了移动通信大楼工作设备的特殊性及其电气安全的重要性，通过对电气干扰产生的根源及其危害约分析，提出了相应的防范措施，并以具体的工程实例加以说明。     

电力通信应急预案体系建设与编制

电力通信是对电网实施监视、控制和管理的中枢神经,是保障电网安全、稳定、经济运行的重要支撑手段。在讨论应急预案体系框架的基础上,提出电力通信系统应急预案体系要按照纵向（行政区域）与横向（通信专业）相结合的方式建设。介绍了应急预案的基本结构、核心要素、结构类型、基本内容、电力通信应急预案电子化系统结构、编制步骤及启用过程。从强化电力应急事件的应急处置能力角度,认为电力通信应急预案应选行动型应急预案。探讨了用排队理论仿真技术仿真电力通信应急预案,并给出了电力通信应急预案仿真的步骤。     

Visual Basic中串口通讯的应用

详细介绍了VB在串口通讯中的重要应用,以及VB通讯控件和系统API函数,并用实例说明VB开发串口通讯的两种方法。     

Mapping fine-scale anatomy of gray matter,white matter,and trigeminal-root region applying spherical deconvolution to high-resolution 7-T diffusion MRI

Objectives

We assessed the use of high-resolution ultra-high-field diffusion magnetic resonance imaging (dMRI) to determine neuronal fiber orientation density functions (fODFs) throughout the human brain, including gray matter (GM), white matter (WM), and small intertwined structures in the cerebellopontine region.

Materials and methods

We acquired 7-T whole-brain dMRI data of 23 volunteers with 1.4-mm isotropic resolution; fODFs were estimated using constrained spherical deconvolution.

Results

High-resolution fODFs enabled a detailed view of the intravoxel distributions of fiber populations in the whole brain. In the brainstem region, the fODF of the extra- and intrapontine parts of the trigeminus could be resolved. Intrapontine trigeminal fiber populations were crossed in a network-like fashion by fiber populations of the surrounding cerebellopontine tracts. In cortical GM, additional evidence was found that in parts of primary somatosensory cortex, fODFs seem to be oriented less perpendicular to the cortical surface than in GM of motor, premotor, and secondary somatosensory cortices.

Conclusion

With 7-T MRI being introduced into clinical routine, high-resolution dMRI and derived measures such as fODFs can serve to characterize fine-scale anatomic structures as a prerequisite to detecting pathologies in GM and small or intertwined WM tracts.

     

信号电涌保护器电路设计中去耦电阻的选择

分析了由气体放电管、电阻、暂态抑制二极管组成的BNC型信号电涌保护器的保护电路,对该保护电路进行了传输特性测试和标称放电电流的冲击实验。结果表明,放电管与暂态抑制二极管在去耦电阻阻值为2.2Ω情况下配合,保护电路在规定的通频带下不仅传输特性较好,而且冲击后的残压也较低。     

Development of Broadband Telecommunications System for Railways Using Laser Technology

We developed a high‐speed telecommunication system for use on railways to improve customer service and the efficiency of operator's telecommunications between ground facilities and trains under operation. We built a mobile telecommunication system, capable of achieving a transfer rate of 1 Gbps in theory, by utilizing laser beam communications technology. We carried out a field test using trains in active service, and obtained results in which a transfer rate of approximately 700 Mbps in the TCP layer was achieved between the ground and a train running at a speed of approximately 130 km/h .     

桥头铝电五期通信电源系统故障解析方法

文章介绍了桥头铝电五期通信电源系统CGY48240的模块化设计思路,对通信电源各模块故障的严重程度进行划分,并根据模块设计思路对故障进行分析,对可能造成通信系统中断的故障提出了应急处理办法。     

三维GIS在电力通信网管理系统中的应用

为了在电力通信网运行维护管理中,充分利用通信设备和传输线缆的GIS属性,准确、直观地掌握分布在全网的设备运行状态,跟踪和分析通信信息流路由,研究基于三维GIS仿真引擎OSG,植入电力通信网资源数据和地理信息数据,将电力通信设备、线缆和通信信息流建模,设计基于三维真实地理场景的软件平台,并在该平台上实现了三维可视化的资源管理功能。该技术的应用,不仅改变了现有管理系统的显示方式、操作方式,而且提供了更丰富、更准确、更直接的管理信息,衍生出新的管理功能,为电力通信网资源管理和调度决策提供了快速、有效地支持。     

Telecommunications Power Plant Damage Assessment for Hurricane Katrina– Site Survey and Follow-Up Results

This paper extends knowledge of disaster impact on the telecommunications power infrastructure by discussing the effects of Hurricane Katrina based on an on-site survey conducted in October 2005 and on public sources. It includes observations about power infrastructure damage in wire-line and wireless networks. In general, the impact on centralized network elements was more severe than on the distributed portion of the grids. The main cause of outage was lack of power due to fuel supply disruptions, flooding and security issues. This work also describes the means used to restore telecommunications services and proposes ways to improve logistics, such as coordinating portable generator set deployment among different network operators and reducing genset fuel consumption by installing permanent photovoltaic systems at sites where long electric outages are likely. One long term solution is to use of distributed generation. It also discusses the consequences on telecom power technology and practices since the storm.     

液相色谱仪检定方法及注意事项

本文对液相色谱仪检定方法及检定中出现的问题,结合自己的工作经验进行了探讨。     

Dielectric phenomenon of living matter

Surges of current in the polarization and depolarization curves for living tissue refer to trapped charges on domain boundaries within the cytoplasm or on cell membranes. An electric field is shown to provoke an elastic deformation of living cells with a relaxation nature. The diagram of a cell with domains of neutral-normal and polarized-excited states is described. An electromechanical model with an inertial element is used to describe the cooperative correlation between domains. A new technique of voltage-stimulated polarization in response to a ramp voltage enables the assessment of the visco-elastic characteristics of animal tissue cells. It reveals the nature of fine liquid crystalline domains of hierarchical structures in cytoplasm and cell membranes with respective threshold voltages that initiate their discrete polarizations. The positive increment of the permittivity spectra in the range of 20 to 10⁶ Hz of intact leaves differs from those exhibiting relaxation behavior, and is shown to be anomalous. Voltages above membrane thresholds on fruit tissue samples cause membrane disruption and this is studied as an electrical breakdown process. The extreme accuracy of utilized methods elucidate otherwise intangible intracellular morphological changes, including cell transformations caused by chemical and thermal treatments. Dielectric methods are shown as the least invasive, compared with traditional biomedical examinations employing mostly histochemical treatments which alter the structure, at least, by artefacts of space charges of the treatment medium