IEC 61000-4-2中ESD间接放电实验一致性研究

国际电工委员会标准IEC 61000-4-2：2001修改了对位于受试设备下方的水平耦合板施加放电的试验方法。按照新的试验方法对3种不同厂商生产的静电放电模拟器在水平耦合板上产生的电场和磁场的一致性进行了研究比较。实验结果表明,距离放电点较近时,不同模拟器之间产生的场的差异很大,而距离放电点较远时,不同模拟器之间的差异变小,可以通过增大放电间距来改善不同模拟器之间的一致性;提高放电电压,可使不同模拟器之间的差异进一步减少。     

基于危险工艺装置设置安全联锁系统的研究

针对危险工艺装置设置安全联锁系统(SIS)问题进行分析和研究,提出在装置建设和改造中,应合理设置独立的SIS,并根据生产装置的安全度等级选择合适的联锁回路,并具有一定的冗余能力,以避免由于硬件随机失效或系统故障时造成联锁功能无法执行;指出SIS在设计时应遵循独立原则、故障安全型原则、共享原则、可靠性原则等。研究结果表明:SIS可提高化工装置的本质安全度,保障生产过程的安全、稳定运行,最大限度地减少由于过程失控造成的人身伤害和设备损坏。     

HIV and AIDS: Responding to a threat to education for sustainable development

The article seeks to sensitize the development community, particularly outside the education sector, about the issues surrounding education as a vehicle for promoting sustainable development in an AIDS environment in Africa. By illustrating how the epidemic impacts education sector staff as well as parents and students at all levels, the article intends to suggest how national authorities, NGOs and donor agencies can work out strategies to enhance the role of education in promoting sustainable development in Africa. Analysis will demonstrate how the AIDS epidemic weakens the education sector, particularly in countries with a generalized epidemic (defined as more than 3% of the adult population being HIV‐positive), undermining the sector's ability to contribute to general literacy and sustainable development. The article will demonstrate that HIV and AIDS is still not fully accepted as an educational issue, which has hampered efforts to deal with its ravages in the educational sector. The need for holistic policy frameworks for supporting teachers and administrators living with HIV and AIDS will be discussed as well as how changes in curriculum and better relations with the community are important in addressing the needs of students. The article will highlight options for developing innovative responses to HIV and AIDS in African education, showing how different forms of education can serve as vehicles for responding to the challenges of the epidemic. The examples emphasize the importance of learner‐centered instruction and partnerships with the health sector and other resources needed in an AIDS‐affected environment. Key messages of the article are that the HIV and AIDS epidemic is a multi‐sectoral problem and that responding to it effectively in the education sector requires coherent responses that address the needs of learners and instructors, including those who are personally affected or infected by HIV and AIDS. Adapting the Education for Sustainable Development initiative to address the challenges posed by the epidemic must be supported by policy development, leadership and advocacy. Diverse partnerships are essential, as the education sector alone cannot deal with the challenge of HIV and AIDS to sustainable development.     

ESD模拟器校验研究现状及进展

介绍了静电放电模拟器校验系统的组成及原理.在综述国内外静电放电模拟器校验研究现状的基础上,指出该研究领域当前需要进一步研究的问题和发展方向.研究结论表明,需要对现行静电放电抗扰度试验标准(IEC 61000-4-2)进行完善,并提出了改进建议;选用在较大频率范围上具有平坦频率响应的电流靶等校验设备;全面分析校验测试的误差来源及影响;改进校验程序和方法.     

环境因素对服装点对点电阻测试结果影响分析

静电放电过程中产生的电火花或电磁场在某些特定环境中会造成重大危害,引起社会广泛关注。穿戴防静电服是静电防护的重要手段,防静电服面料的点对点电阻是防静电服主要性能指标之一,对该指标的准确测量有助于对服装防护能力的准确认识。本文阐述了面料点对点电阻测试原理,详细讨论了防静电服点对点电阻测试结果的组成,指出测试过程中的影响因素包括环境温湿度、测试台面绝缘性能、仪器周围的电磁环境和操作人员的带电等,其中重点分析了环境温湿度对测试结果的影响,指出环境温湿度是点对点电阻测试过程中的主要影响因素,以期通过对相关因素的控制提高对该项性能指标测试结果的准确程度。     

影响静电放电试验结果的因素和试验分析

静电放电测试是很多产品标准中常见的电磁兼容检测项目,本文叙述了静电放电测试中一些容易被测试人员忽视的细节,同时分析影响静电放电测试结果的因素,为EMC实验室和企业人员正确开展静电放电测试,和加强实验室管理提供帮助。     

人水系统演变模拟的嵌入式系统动力学模型

论文首先提出人水系统的概念,并针对人水系统演变模拟的难点和特点,基于系统动力学原理,提出了更具实用意义的嵌入式系统动力学模型(ESD模型)。ESD模型是在系统动力学理论方法的基础上,考虑到社会经济系统、水循环系统(包括社会水循环系统、自然水循环系统)自身的特点和规律,充分利用现有的相关理论方法,在系统动力学模型的基础上,加入其他学科的定量化模型,形成耦合的模型。该模型既全面吸收系统动力学的优点,同时又接纳了相关学科的研究成果,大大提升了系统动力学的应用研究能力,同时也解决了复杂而又有专业特点的系统模拟问题,适用于人水系统演变模拟。     

Robust reliability and electrical performances by the bulk-contact modulation in 60-V p-channel LDMOS power components

To increase reliability and electrical performance, shallow-trench isolation (STI) (or called field-oxide (FOX)) structures were inserted in the bulk-contact region of 60-V high-voltage p-channel lateral-diffused MOSFET (pLDMOS) devices in this study. As the FOX ratio increased with the addition of FOX segments, the value of the secondary breakdown current (I_t2) was enhanced. Therefore, the anti-electrostatic discharge ability of a pLDMOS device can be efficiently improved using this novel method. In addition, when the weighting ratio of FOX structures increased, variation values in the trigger voltage (V_t1) and holding voltage (V_h) of the corresponding samples remained within the range of approximately 1–4 V. The R_on value decreased because of more uniform conduction. The experimental data for the FOX structures added to the bulk revealed that the I_t2 value was improved by approximately 13.98%, V_h values were greater than 60 V (which is favorable for latch-up immunity), and the R_on value was decreased by approximately 12.62% compared with a reference device under test (without FOX segments in the bulk-contact region).     

PESD测试中静电枪表现的性能的研究

在本文中,我们介绍了两种不同类型的ESD静电枪(ESS-200AX和ESD 3000),分别用两种ESD静电枪对芯片进行抗干扰度测试,研究两种类型的ESD静电枪对同种样本芯片表现的性能。结果显示,对于完全符合IEC 61000-4-2要求的不同的ESD静电枪表现出不完全的一致性。为了比较IC的ESD性能,我们目前主要采用同一系列的芯片采用相同的ESD静电枪进行测试。     

典型静电放电火花点燃危险性评价方法研究

通过研究典型静电放电火花的实际点燃能力 ,对实际生产工艺工程中的静电放电火花的点燃危险性进行定量评价。静电放电火花的放电相当能量、放电火花空间分布范围和放电火花持续时间 ,决定了静电放电火花实际点燃可燃物的可能性大小 ,因此不同类型的静电放电火花点燃可燃物的差异性很大。根据数据序列理论分析 ,引入静电放电火花点火源序列和可燃物危险性序列之间存在的关联性 ,反映了静电放电火花点燃可燃物的危险程度 ,可用于对静电放电火花的实际点燃危险性进行量化评价。对聚烯烃粉体生产工艺过程中典型和频发性的静电放电火花的点燃危险性进行了定量评价。