共查询到20条相似文献，搜索用时 546 毫秒
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Michael House 《Higher Education Quarterly》1983,38(1):1-8
He (the constable) will be civil and obliging to all people of every class and rank. He must be particularly cautious not to interfere idly or unnecessarily in order to make a display of his authority. … if he does his duty in a quiet and determined manner such conduct will probably excite the well-disposed of the bystanders to assist him if he requires them…particular care is to be taken that the constables of the police do not form false notions of their powers and duties. Initial regulations of the Metropolitan Police, 1829. 相似文献
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Chris Cavey 《英语沙龙》2014,(11):46-47
Most respected scientists agree that we need to find another source of Energy--and quickly. Oil is running out and anyway, if we continue to burn oil and pump carbon into the atmosphere then the effects on global climate will lead to global catastrophe even be- fore the oil disappears. 相似文献
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These games are excerpted from Play Poweravailable from Play Power Publishing, P.O. Box 2186, Orinda, CA 94563. 相似文献
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半导体激光器的稳定性更取决于电流控制器.实际中的电流源在应用于半导体激光器中的时候,仍有许多需要改进的地方.本文描述了一种用于驱动在医疗器械中所使用的小功率半导体激光器的新型电源的设计方法. 相似文献
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校长课程领导力:从"个力"走向"合力" 总被引：1，自引：0，他引：1
要想使学校课程有高质量、高效能的表现,必须要有高绩效的校长课程领导力.校长课程领导力是校长与追随者相互作用的合力,是校长与追随者为实现共同的课程愿景而进发的一种思想与行为的能力.建立学校课程愿景,赢得有效的追随者和"传教士",演化组织结构和体系,学校文化的变革与重塑、统筹外部支持系统是实现高绩效校长课程领导力的核心策略. 相似文献
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The security constrained distributed optimal power flow (DOPF) of interconnected power systems is presented. The centralized OPF problem of the multi-area power systems is decomposed into independent DOPF subproblems, one for each area. The dynamic security region (DSR) to guarantee the transient stability constraints and static voltage stability region (SVSR) constraints, and line current limits are included as constraints. The solutions to the DOPF subproblems of the different areas are coordinated through a pricing mechanism until they converge to the centralized OPF solution. The nonlinear DOPF subproblem is solved by predictor-corrector interior point method (PCIPM). The IEEE three-area RTS-96 system is worked out in order to demonstrate the effectiveness of the proposed method. 相似文献
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Judith K. Meyers 《TechTrends》1989,34(1):35-38
Conclusion Guidelines implementation is no mysterious process. It is a systematic undertaking, beginning with a carefully and clearly
thought out plan, followed by patient and persistent pursuit of a selected set of achieveable goals. As each goal is met,
another takes its place and the cycle begins again. 相似文献
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利用标准的0.18μm6层金属混合信号/射频CMOS工艺设计了一种工作在2.4 GHz频段的全集成E类功率放大器.电路采用两级放大器级联结构,其中驱动级利用谐振技术生成高摆幅开关信号;输出级采用E类结构实现了信号的功率放大.在1.2 V电源电压下,设计的功率放大器最高输出功率为8.8 dBm,功率附加效率(PAE)达到44%.同时,提出了一种E类功率放大器功率控制方法.通过改变进入E类开关晶体管的信号幅度和占空比,在3位数字控制字的控制下,输出功率达到-3～8.8 dBm.所设计的功率放大器可以满足诸如无线传感网络(WSN)和生物遥测等低功率系统的应用. 相似文献
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Allan LG 《Learning & behavior》2003,31(2):192-204
In a recent theoretical paper, Cheng (1997) presented a new causal model, power PC. She argued that power PC was able to account for data in the literature that raised problems for associative models—notably, the Rescorla-Wagner model (Rescorla & Wagner, 1972). The purpose of the present paper is threefold: (1) to show that, overall, the data in the literature, which Cheng relied on to make her case, do not in fact provide support for power PC, (2) to show that, overall, the experiments reported in the literature since the publication of Cheng, designed specifically to evaluate the predictions of power PC, also do not provide support for power PC, and (3) to suggest that Cheng’s assessment of associative models was too narrowly defined. 相似文献
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The pressing need to alleviate our urban airquality has provided the impetus for electric vehicles. Over the years, a great deal of research and development work has been carried out, and is still underway, on all aspects of electric vehicles especially on improving the power sources, namely the re-chargeable batteries, fuel cells and electrochemical supercapacitors. The developments in rechargeable batteries for electric vehicles are reflected in this part of the article while fuel cells and electrochemical supercapacitors will be described in Part 2 of the article. 相似文献
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吴燕 《佳木斯教育学院学报》2014,(2):15-16
权力制衡是政治学研究中一个重要的问题。从古至今,有很多政治学家对这个问题发表了自己的看法。权力制衡是社会公平正义的重要保证,要从根本上根治腐败,保证改革开放和社会主义现代化建设事业的顺利进行,关键在于我国政治体制改革是否成功,而成功的关键在于是否彻底实现当代中国权力制衡结构的构建。 相似文献
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知识负载着一定的价值观,是社会各种利益群体间力量争锌的一种映照。当前:城市与乡村是我国两大基本社会生存空间,它们在官方知识中的地位与角色存在差异,本文拟用社会学的视角对语文教科书中有关城乡的内容进行实证分析、并认为权力分配的失衡是诰成这种差异的根源。 相似文献
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采用三维封装结构取代传统的平面封装结构可获得高性能集成电力电子模块.在实验室完成由2只芯片尺寸封装MOSFET和驱动、保护等电路构成的三维封装半桥IPEM.从互连焊点形状的优化和封装工艺过程参数的控制出发,进行IPEM的可靠性控制.采用阻抗分析仪Agilent 4395A测量IPEM的寄生参数,建立了半桥IPEM的寄生参数模型;采用半桥IPEM构成12V/3A输出的同步整流Buck变换器,2只MOSFET的漏源极尖峰电压小,说明HB-IPEM的三维封装结构有效减小了寄生电感.运用Flotherm软件对半桥IPEM进行了热分析,给出了温度分布仿真结果.焊料凸点传热使芯片的最高结温明显降低,三维封装结构实现了良好的热设计. 相似文献