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声控技术及其应用
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作者 张同根 《电工技术杂志》 1993年第1期21-24,共4页
利用声学方法检测产品性能和监控生产过程是一门发展中的新技术。与光波或电磁波等形式的控制器相比,声控技术具有一些明显的优点:(1)这种方式不产生电磁辐射,不会干扰附近的电气设备。(2)不易受污物和灰尘的影响。(3)超声射束看不见、... 利用声学方法检测产品性能和监控生产过程是一门发展中的新技术。与光波或电磁波等形式的控制器相比,声控技术具有一些明显的优点:(1)这种方式不产生电磁辐射,不会干扰附近的电气设备。(2)不易受污物和灰尘的影响。(3)超声射束看不见、听不到、易于形成良好的指向性,阻断声束的任何物体都会被记录下来。 展开更多
关键词 声控技术 传感器 电力工技术
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Technical Efficiency Analysis of Electric Power Industry with Stochastic Frontier Model
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作者 王金祥 赵强 吴育华 《Transactions of Tianjin University》 EI CAS 2002年第3期207-210,共4页
A kind of algorithm was provided to resolve the calculating problem of stochastic frontier model and applied to electric power industry.By Matlab,maximum likelihood estimation is adopted to evaluate σ and λ of stoch... A kind of algorithm was provided to resolve the calculating problem of stochastic frontier model and applied to electric power industry.By Matlab,maximum likelihood estimation is adopted to evaluate σ and λ of stochastic frontier model in this paper, then the technical efficiency of electric power companies is calculated. The calculated and analyzed results reflect the situation of the management of electric power industry on the whole,that is ,the electric power companies with high technical efficiency are those which have developed their modern enterprise system successfully. 展开更多
关键词 stochastic frontier technical efficiency electric power industry MATLAB
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The Coevolutionary Relationship of Technology, Market and Government Regulation in Telecommunications 被引量:1
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作者 Xuchen Lin Ting-Jie Lv Xia Chen 《China Communications》 SCIE CSCD 2018年第8期152-173,共22页
The telecommunications industry has been undergoing tremendous technological changes, and owning to continuous technological advancement, it has maintained sustained prosperity and development. In this paper, the inte... The telecommunications industry has been undergoing tremendous technological changes, and owning to continuous technological advancement, it has maintained sustained prosperity and development. In this paper, the interplay between technology, market and government in telecommunications is discussed briefly, and then we introduce technology and government into the traditional SCP(Structure – Conduct – Performance) paradigm to develop an industry analysis framework called TGM(SCP)(Technology – Government – Market(Structure – Conduct – Performance)). Based on this framework, we present the spiral coevolution model which elaborates on the interaction mechanism of technological innovation with government regulation and market dynamics from the perspective of industry evolution. Our study indicates that the development of the telecommunications industry is the result of the coevolution of technology, government regulation and market forces, and among the three actors, technology is the fundamental driving force. Relative to the "invisible hand"(market) and "visible hand"(government), we conceptualize technology as the "third hand", which fundamentally drives the development of telecommunications industry in coordination with the other two hands. We also provide several policy implications regarding these findings. 展开更多
关键词 technological innovation government regulation telecommunications evolutionary theory
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Industrial Arrangement of Large-scale,Non-grid-connected Wind Power Industrial Zones in Coastal Areas of China
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作者 JIN Pingbin FU Zhiwei BAN Maosheng 《Chinese Geographical Science》 SCIE CSCD 2012年第1期109-118,共10页
Constructing an industrial system for a large-scale,non-grid-connected wind power industry is a key step towards the diverse utilization of wind power.However,wind power exploitation is not only a technical challenge ... Constructing an industrial system for a large-scale,non-grid-connected wind power industry is a key step towards the diverse utilization of wind power.However,wind power exploitation is not only a technical challenge but an industrial problem as well.The objective of this study is to introduce a concept of large-scale,non-grid-connected wind power(LSNGCWP) industrial zones and establish an evaluation model to assess their industrial arrangement.The data of wind energy,industry,nature resources and socio-economy were collected in this study.Using spatial overlay analysis of geographic information system,this study proposes a spatial arrangement of the LSNGCWP indus-trial zones in the coastal areas of China,which could be summarized as the 'one line and three circles' structure,which will contribute to the optimization of the industrial structure,advance the wind power technology,coordinate the multi-industrial cooperation,and upgrade the industrial transformation of China's coastal areas. 展开更多
关键词 coastal areas in China wind energy resources large-scale non-grid-connected wind power industry industrial arrangement
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Elucidating the dynamics of solvent engineering for perovskite solar cells 被引量:5
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作者 Zulqarnain Arain Cheng Liu +7 位作者 Yi Yang M.Mateen Yinke Ren Yong Ding Xuepeng Liu Zulfiqar Ali Manoj Kumar Songyuan Dai 《Science China Materials》 SCIE EI CSCD 2019年第2期161-172,共12页
Researchers working in the field of photovoltaic are exploring novel materials for the efficient solar energy conversion.The prime objective of the discovery of every novel photovoltaic material is to achieve more ene... Researchers working in the field of photovoltaic are exploring novel materials for the efficient solar energy conversion.The prime objective of the discovery of every novel photovoltaic material is to achieve more energy yield with easy fabrication process and less production cost features.Perovskite solar cells (PSCs)delivering the highest efficiency in the passing years with different stoichiometry and fabrication modification have made this technology a potent candidate for future energy conversion materials.Till now,many studies have shown that the quality of active layer morphology,to a great extent,determines the performance of PSCs.The current and potential techniques of solvent engineering for good active layer morphology are mainly debated using primary solvent,co-solvent (Lewis acid-base adduct approach)and solvent additives.In this review,the dynamics of numerously reported solvents on the morphological characteristics of PSCs active layer are discussed in detail.The intention is to get a clear understanding of solvent engineering induced modifications on active layer morphology in PSC devices via different crystallization routes.At last,an attempt is made to draw a framework based on different solvent coordination properties to make it easy for screening the potent solvent contender for desired PSCs precursor for a better and feasible device. 展开更多
关键词 PEROVSKITE solvent engineering Lewis acid-base ADDITIVE coordination property
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