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电场强度对ADSS光缆的影响 被引量:9
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作者 周一峰 陈清美 《电力系统通信》 2001年第11期16-18,21,共4页
为了保证ADSS光缆悬挂在安全的电场环境中 ,主要分析电场强度和电位对ADSS光缆的影响 ,并通过三维实例计算 ,分析各种因素对ADSS光缆电场强度的影响。
关键词 ADSS 光缆 电场程度 电力系统 通信
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Design and Verification of FPGA-Based Applications in Nuclear Power Plants
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作者 Joon Ku Lee Yang Mo Kim 《Journal of Energy and Power Engineering》 2013年第3期537-544,共8页
Nuclear industries have faced the unfavorable circumstance such as components obsolescence and aging of instrumentation and control system, therefore, nuclear society is striving to resolve this issue fundamentally. V... Nuclear industries have faced the unfavorable circumstance such as components obsolescence and aging of instrumentation and control system, therefore, nuclear society is striving to resolve this issue fundamentally. Various studies have been conducted to address components obsolescence of instrumentation and control system. Intuitively FPGA (field programmable gate arrays) technology is replacing the high level of micro-processor type equipped with various software and hardware which causes acceleration of the aging and obsolescence in I & C (instrumentation and control) system in nuclear power plants. FPGAs are highlighted as an alternative means for obsolete control systems. When engineers design the control system of NPPs (nuclear power plants) with FPGAs, it is important to meet the system development life cycles and conduct the verification and validation activities regarding to FPGA-based applications for use in NPPs. Because the verification and validation process is more important than the design process, engineer should consider the characteristics of FPGA, HDL (hardware description language) programming, faults mode, and optimization technique. And also these characteristics should be reflected in verification and validation activities. As a minimum requirement, system designers require that HDL-programmed applications should be developed in accordance with system development life cycle and HPD design process. In the verification and validation processes, a review, test, and analysis activities should be properly conducted. 展开更多
关键词 FPGA (field programmable gate arrays) HDL (hardware description language) NPPs (nuclear power plants) V V(verification and validation) RTL (register transfer level).
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Influence of residual surface stress on the fracture of nanoscale piezoelectric materials with conducting cracks
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作者 NAN HaiShun WANG BaoLin 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第2期280-285,共6页
In this paper,we analyze the stress and electric field intensity factors affected by residual surface stress for conducting cracks in piezoelectric nanomaterials.The problem is reduced to a system of non-linear singul... In this paper,we analyze the stress and electric field intensity factors affected by residual surface stress for conducting cracks in piezoelectric nanomaterials.The problem is reduced to a system of non-linear singular integral equations,whose solution is determined by iteration technique.Numerical results indicate that the residual surface stress can significantly alter the crack tip fields at nanometer length scales.Due to the residual surface stress,281he electric field can produce stress around crack tip.This suggests a strong electromechanical coupling crack tip field for nanoscale piezoelectric materials.Such a finding is considerably different from the classical fracture mechanics results.A transit electric field to stress load ratio is identified,for which influences of residual surface stresses vanish.The research is useful for the applications of nanoscale piezoelectric devices. 展开更多
关键词 fracture mechanics residual surface stress piezoelectric materials nanomechanics conducting cracks
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