IEC/TC29标准和电声标委会的进展

2002年5月，全国电声学标准化技术委员会秘书处同《电声技术》编辑部合作，开辟了本专栏，从2002年5～10月作了6期报道，介绍IEC／TC29：电声学和全国电声学标准化技术委员会的历史和近况；声级计、测量传声器、助听器、仿真耳和人耳、人头模拟器、声校准器、听力器及其它电声测量仪器标准制订情况；     

IEC/TC29和IEC/TC100最新动态

１IEC／TC２９电声学标准制订近况１．１助听器标准IEC６０１１８系列（１）IEC６０１１８－１０“助听器标准导则”２００２年３月８日IEC／TC２９决定撤消IEC６０１１８－１０（见２９／５１３／MC文件）。撤消理由：由于IEC６０１１８助听器系列标准不断修订，使IEC６０１１８－１０技术上已阵旧，没有必要花费时间和精力再去修订。撤消自２００２年５月１５日生效。（２）IEC６０１１８－８助听器，第８部分：“模拟实际工作条件下助听器性能测量方法”２００２年４月１９日发表了２９／５１７／RVC文件，对‘供表决的委…     

IEC／TC29 2004年6月到2005年1月的标准动态

IEC／TC29自2004年6-12月的工作文件(续《电声技术》2004年第6期67页)见表1。2004年颁布的公告见表2。     

IEC／TC29标准动态

IEC／TC29自2005年7月到2006年1月的工作文件（续《电声技术》2005年第8期67页清单）清单见表1。     

IEC／TC29标准动态

1 工作文件清单 IEC／TC29自2006年1月到2006年11月的工作文件（续《电声技术》2006年第4期72页清单）清单见表1。     

IEC/TC29标准动态(2005年2月～2005年6月)

1工作文件及公告 IEC／TC29自2005年2月到2005年6月的工作文件（续《电声技术〉〉2005年第3期68页清单）清单见表1。     

IEC／TC29：电声学和全国电声学标准化技术委员会标准动态（2006年12月～2008年8月）

1 工作文件清单 IEC/TC29自2006年12月～2008年8月的工作文件清单(续<电声技术>2007年第6期第76页,以下统称上文)     

《光纤与电缆及其应用技术》杂志读者信息反馈卡（2006年第5期）

IEC61291-5-2(2002-08)光纤放大器第5-2部分:定量规范-光纤放大器可靠性IEC/TR61292-1(1998-01)纤维光学光纤放大器参数IEC/TR61292-2(2003-01)光纤放大器第2部分:采用电子频谱分析仪进行噪声系数估算的理论背景IEC/TR61292-3(2003-06)光纤放大器第3部分:分类、特性和应用IEC/TR61292-4(2004-08)光纤放大器第4部分:包括拉曼放大器在内的光纤放大器无损、安全使用的最大允许光功率IEC/TR61292-5(2004-07)光纤放大器第5部分:偏振模色散-概要资料IEC61757-1(1998-11)纤维光学传感器第1部分:总规范IEC62148-1(2002-03)纤维光学有…     

IEC/TC29标准动态(2006年1月~2006年11月)

IEC/TC29:电声学和全国电声学标准化技术委员会信息专栏:共享信息2007年第1号1工作文件清单IEC/TC29自2006年1月到2006年11月的工作文件(续《电声技术》2006年第4期72页清单)清单见表1。表1IEC/TC29自2006年1月~2006年11月的工作文件序号文件名称文件内容时间129/579A/RVC2果9/     

IEC/TC29:电声学和全国电声学标准化技术委员会信息专栏:2005年第1号IEC/TC29 2004年6月到2005年1月的标准动态

1工作文件及公告 IEC/TC29自2004年6-12月的工作文件(续<电声技术>2004年第6期67页)见表1.2004年颁布的公告见表2.     

GEMNET: a generalized, shuffle-exchange-based, regular, scalable,modular, multihop, WDM lightwave network

GEMNET is a generalization of shuffle-exchange networks and it can represent a family of network structures (including ShuffleNet and de Bruijn graph) for an arbitrary number of nodes. GEMNET employs a regular interconnection graph with highly desirable properties such as small nodal degree, simple routing, small diameter, and growth capability (viz. scalability). GEMNET can serve as a logical (virtual), packet-switched, multihop topology which can be employed for constructing the next generation of lightwave networks using wavelength-division multiplexing (WDM). Various properties of GEMNET are studied     

Thermodynamics of copper matte converting: Part III. Steady-state volatilization of Au,Ag, Pb,Zn, Ni,Se, Te,Bi, Sb,and As from slag,matte, and metallic copper

A comprehensive compilation of various thermodynamic data required for a complete analysis of copper matte converting reactions is presented. The data comprise estimated free energies of formation for such gases as SeO, SeS, TeO, TeS, BiO, BiS, SbO, SbS, AsO, and AsS, as well as activity coefficients in dilute copper alloys and vapor pressures of various elements and compounds. The volatilization of minor elements in steady-state reactors comprising gas and several condensed phases is mathematically formulated, and a parameter which governs the volatilization in such reactors is defined and named volatilization constant. The vapor pressures of various volatile species are calculated thermodynamically for the Noranda Process reactor by assuming equilibrium conditions. The volatilization constants of various minor elements are expressed explicitly as functions of oxygen and sulfur activities. Formerly Associate Professor, Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT     

Bits, symbols, bauds, and bandwidth

The use of clear, concise, and unambiguous language in telecommunications engineering is vital to communicate a desired meaning and understanding. Terminology should be based on rigorous engineering principles and traceable to well known and dependable sources. This article deals with four everyday terms commonly encountered in the popular semi-technical press as well as in serious engineering periodicals. The misuse of these and other terms can lead to low-balled cost proposals, court litigation, and patent infringement cases. Imagine how an engineering student can be confused when she/he typically encounters bandwidth measured in bits per second     

Novel planar, square-shaped, dielectric-waveguide, single-, and dual-mode filters

This paper presents a novel concept of a square-shaped dielectric-waveguide resonator, which can easily realize a dielectric-waveguide cross-coupled filter or a dielectric-waveguide dual-mode filter, using the conventional printed circuit board (PCB) process. This planar dielectric-waveguide resonator has a higher Q value than a microstrip resonator. The physical mechanisms of both single- and dual-mode filters are elucidated. Some new coupling structures are developed for undergoing the PCB process. Filter design procedures are detailed. Design curves for the coupling coefficients of internal- and external-coupling structures are determined by full-wave finite-element-method electromagnetic calculations. Measurement results are highly consistent with theory for all trial filters. This study offers an effective means of producing low-cost high-performance planar circuit filters.     

PBX技术.市态.营销.选购

本文介绍了ＰＢＸ交换机的技术及市场需求态势。并提出ＰＢＸ产品的营销要素及其用户在选购时应遵循的原则。     

Dilemmas,uncertainty, risks,and board performance

This paper traces the origins of the words risk, uncertainty, governance and development and argues that a deeper understanding of each allows more effective decision taking in the boardroom. It argues that the role of the board of directors is to balance and rebalance continuously their irresolvable dilemma — ‘how do we drive our enterprise forward while keeping it under prudent control?’ It argues that it is the board’s role to focus on uncertainty, rather than risk, and this requires a different set of intellectual skills from board members to be able to cope with monitoring a range of diverse scenarios. This is crucial for a board to develop stronger ways of both leading their organisation and of ensuring the connectedness of the learning within and between the board and the operational unit’s risk taking. It advocates that to achieve this a board must develop new ways of learning — especially of thinking strategically and becoming more sensitised to the dynamics of their changing external environments. This will take them well beyond the comforts of their specialist managerial disciplines and into the true world of directing. The paper demonstrates the importance of continuous learning in reducing organisational uncertainty and risk. It uses the ‘Learning Board’ process and model as the central processor of both strategic and operational learning to create an annual rhythm for the board’s year.