EMC中的两种接地技术

电磁兼容接地设计有单点接地和多点接地2种基本方法,低频电路中要求用单点接地,高频电路中用多点接地,用多点接地设备如果不能通过EFT/B测试,可以尝试单点接地方法。实验证明,对某些高频电路完全可以用单点接地方法满足EMC要求。     

铜材料在输电线路防雷接地中的应用

针对处于沿海盐碱地质等地区的输电线路接地电阻易受腐蚀的问题,提出采用一种新型镀铜接地装置作为输电线路接地电阻的新方法,并应用于生产实际中。通过分析新材料在接地系统中应用的各项效益指标,并与之前传统的接地电阻进行对比,可知利用镀铜作为接地电阻材料,能有效地减少由于雷击而接地电阻不满足要求造成输电线路跳闸的故障,为电力系统的安全稳定运行提供可靠保障。     

微波站接地设计

主要介绍微波站接地电阻要求和计算 ,以及接地网设计。尤其是对在土壤电阻率高的地方建设的微波站 ,论述为降低其接地网接地电阻所采取的措施     

防雷接地系统施工质量通病及其控制

分析雷电损害和防雷接地在建筑工程中重要性。对建筑防雷接地系统施工常见质量通病进行分析,提出在施工中做好防雷接地系统质量控制的要点。     

火电厂接地系统的设计与分析

简述了火力发电的特点和现况,介绍了火电厂接地系统的种类与接地装置。通过某火电厂接地系统的设计实例,说明了该系统各接地环节的参数设定和敷设方式。对其中关于电缆屏蔽层的接地抗干扰问题进行了深入研究,进行了有针对性的实验和数据分析,为相关研究提供了参考。     

Systems for electrostatic evaluation in industrial silos

While a primary strategy for avoiding ignition during silos filling lies in control of the ignition energy of the suspension, it may also be possible to control the energy of on-bed brush discharges created during filling. Two instrument systems are described for investigations in operational, full-scale process equipment. A discussion is made of the effective energies of brush discharges, the effects of process variables on static, and types of charge neutralizer that have been used or proposed. The instrument systems allow pragmatic, in-plant evaluation of the effects of process variables and the benefits of any charge neutralizer system that is used.     

核电站接地系统设计

介绍广东大亚湾核电站和岭澳核电站接地系统的设计情况 ,从功能、设备等方面论述核电站接地系统的设计原则和具体方法     

10kV供电系统接地方式分析

结合A企业10kV电力系统的问题，对系统接地方式及设备改造进行比较分析，选择与系统相适应的中性点接地方式及其相关设备，并对应用情况进行了分析。     

How symmetrical assumptions advance strategic management research

We develop the case for symmetrical assumptions in strategic management theory. Assumptional symmetry obtains when assumptions made about certain actors and their interactions in one of the application domains of a theory are also made about this set of actors and their interactions in other application domains of the theory. We argue that assumptional symmetry leads to theoretical advancement by promoting the development of theory with greater falsifiability and stronger ontological grounding. Thus, strategic management theory may be advanced by systematically searching for asymmetrical assumptions in existing theory in order to identify the instances where new and useful insights can be derived from adopting symmetrical assumptions. Copyright © 2013 John Wiley & Sons, Ltd.     

光伏组件PID效应及解决方案论析

描述了光伏组件发生PID的效应及现象,从电池角度阐述了其主要可能形成的机理,并通过实验观察到PID问题在实际测试及使用过程中的现象和影响,通过实验比对不同扩散方阻及扩散PN结深、不同折射率的镀膜工艺、不同类型组件封装材料以及正负极不同系统接地方式等解决方案,重点论述了解决PID问题的方法以及几种方案在目前实际生产中的应用情况,为解决PID问题提供参考。     

The Grounding of a Discipline: Cognition and Instruction in Technology Education

Technology education has long struggled to establish itself as an equal partner in general education and often struggled to gain recognition for the value of its instruction. Frequently technology educators tout the effectiveness of their programs based on anecdotal evidence gathered from their classroom experiences on how their instructional methods empower students to learn. Although technology education originated without any meaningful input from cognitive science research, it appears that technology education instruction methods are remarkably consonant with findings from cognitive science that define good instruction. Specifically, there is considerable accord between how instruction in technology education and cognitively based instructional models such as collaborative learning, socially distributed expertise, design/engineering, and project-based instruction can be connected. The role of the cognitive research findings on instruction could inform a long over-due theoretical grounding of instruction in technology education. The absence of research on learning and instruction in technology education could be attributed to a lack of theoretical grounding in this relatively new field. This paper examines four cognitively based models of instruction and reviews the relationships between research in the cognitive sciences on learning and instruction in technology education. The consonance between the research recommendations from the cognitive sciences and practice in technology education instruction could serve to stimulate debate on the theoretical grounding of an emerging field of study.     

10kV城市电网接地方式探讨

分析了目前１０ ｋＶ城市电网接地系统存在的问题,提出了两种改善１０ ｋＶ电网运行状况的方法,并简要说明了各自的优缺点。     

浅谈煤矿井下橡套电缆冷补接线工艺

煤矿井下接地、照明、信号使用电缆量大,导致电缆接线、绝缘层损坏多,更是因为煤矿防爆性能的重要性,对井下电缆接线提出了更高的要求,煤矿井下电缆冷补接线工艺在矿井机电作业中发挥了很大的作用,具有推广价值意义。     

一种具有温度补偿的GaN功放线性化器

为改善氮化镓固态功率放大器的非线性失真,利用模拟预失真线性化技术,设计出一款新型线性化器,将其用于氮化镓固态功率放大器的线性化驱动模块,并增加温度补偿方案。通过使用多管级联方式增强二极管非线性特性,并对二极管管座电路进行优化设计,将射频接地与直流接地分离,使用电磁仿真软件对线性化器进行仿真验证。仿真结果表明,实物加工后进行测试,可实现增益幅度补偿范围0.9～7.6 dB,相位补偿范围9°～40°,对比相关文献,分别提高了1.2 dB和12°。线性化驱动模块与目标放大器级联测试,在29 GHz饱和功率回退7 dB时,三阶互调改善7.07 dB,性能优异。所设计的预失真器可改善功率放大器的非线性特性,提高卫星通信系统性能,对卫星通信系统具有重要意义。     

How to develop original,courageous ideas in business marketing research

Despite evidence of meticulous business-to business marketing research efforts, and the pleas of editors for truly original, ground-breaking research, there is still a shortage of original, courageous research ideas. To provide guidance to researchers and address this problem, we apply the OBC model (observe the world, bridge disciplines, and challenge assumptions and theories), proposed by Kock, Assaf, and Tsionas (2020). We discuss the three main and four blended strategies recommended by this model, and illustrate each of these strategies with examples drawn from the marketing literature. Our application of the OBC model offers actionable guidelines for generating original research ideas, as well as theoretical grounding for each element of the model. Given the publication pressure felt by young academic researchers, we hope that our discussion provides encouragement and guidance, which will result in original, courageous business-to-business marketing research.     

Supply chain risk management in financial crises—A multiple case-study approach

Supply Chain Risk Management has become a key concern for organizations, which is even further emphasized by the current economic and financial crisis. Against this background, this paper investigates successful approaches and experiences by companies in dealing with this new reality, especially as it concerns the supply side. Using in-depth case studies conducted among eight European enterprises, we develop a set of propositions about how companies manage supply risks in financial crises, highlight how their risk management approaches have shifted, and illustrate how they are related to Enterprise Risk Management. Our framework is further differentiated based on whether firms are predominantly engaged in manufacturing or services—a factor influencing how supply chain risk is managed. Transaction cost economics serves as our main theoretical anchor. By rigorously grounding our research in both theory and empirical evidence, we provide valuable insight for both academia and practice.     

Embracing uncertainty in value-based selling by means of design thinking

Service delivery and solution selling both strive to achieve increased value through co-creation. However, the concept of value co-creation is a macro concept that still lacks precise empirical grounding and accurate operationalisation. To uncover the microlevel processes of co-creation, we examined 15 sales cases via the lens of uncertainty management. We used design thinking and actor-network theory to explore how certainty evolves between a seller and the buyer. We argue that the common industrial logic for addressing and tackling customer problems in solution selling, hitherto portrayed as either deductive or inductive, is incomplete. Indeed, our research shows that solution selling and value co-creation both require a different, abductive epistemology to address the uncertainty. Our study also provides an empirical extension to the value co-creation literature.     

The Sound of One Hand Clapping: The 2010 Merger Guidelines and the Challenge of Judicial Adoption

There is ample justification for the consensus view that the Horizontal Merger Guidelines have proven one of antitrust law??s great successes in the grounding of antitrust doctrine within economic learning. The foundation of the Guidelines?? success has been its widespread adoption by federal courts, which have embraced its rigorous underlying economic logic and analytical approach to merger analysis under the Clayton Act. While some have suggested that the Guidelines?? most recent iteration might jeopardize this record of judicial adoption by downplaying the role of market definition and updating its unilateral effects analysis, we believe that these updates are generally beneficial and include long-overdue shifts away from antiquated structural presumptions in favor of analyzing competitive effects directly where possible. However, this article explores a different reason to be concerned that the 2010 Guidelines may not enjoy widespread judicial adoption: the 2010 Guidelines asymmetrically update economic insights underlying merger analysis. While the 2010 Guidelines?? updated economic thinking on market definition and unilateral effects will likely render the prima facie burden facing plaintiffs easier to satisfy in merger analysis moving forward, and thus have significant practical impact, the Guidelines do not correspondingly update efficiencies analysis, leaving it largely as it first appeared 13 years earlier. We discuss two well-qualified candidates for ??economic updates?? of efficiencies analysis under the Guidelines: (1) out-of-market efficiencies and (2) fixed-cost savings. We conclude with some thoughts about the implications of the asymmetric updates for judicial adoption of the 2010 Guidelines.     

A model to analyse students’ cooperative idea generation in conceptual design

In this article we focus on the co-creation of ideas. Through the use of concepts from collaborative learning and communication theory we suggest a model that will enable the cooperative nature of creative design tasks to emerge. Four objectives of the model are stated and elaborated on in the paper: that the model should be anchored in previous research; that it should allow for collaborative aspects of creative design to be accounted for; that it should address the mechanisms by which new ideas are generated, embraced and cultivated during actual design; and that it should have a firm theoretical grounding. The model is also exemplified by two test sessions where two student pairs perform a time-constrained design task. We hope that the model can play a role both as an educational tool to be used by students and a teacher in design education, but primarily as a model to analyse students’ cooperative idea generation in conceptual design.     

Knowledge-based sales management strategy and the grafting metaphor: Implications for theory and practice

An assessment of sales research reveals limited theoretical sophistication and grounding, less focus on intraorganizational issues, over emphasis on the micro (salesperson) versus the macro (sales function) aspects in sales management, and the criticality of knowledge to sales management. Although marketing literature draws on metaphors for theory development, there is very little sales management research that relies on metaphors for theory. In addition, reflecting the recent changes in the external environment, there have been several calls to research knowledge-based sales management. Therefore, this article explores knowledge grafting - a new theoretical metaphor - in the context of knowledge-based sales management. In doing so, first, we briefly overview the metaphor literature. Second, we introduce and evaluate the grafting metaphor. Third, we discuss the important issues of knowledge-based sales management. Fourth, we describe the knowledge grafting process and develop a knowledge grafting based conceptual framework in the context of sales management. Fifth, we discuss the strategic normative imperatives for practice. Finally, we conclude with a call for future research.