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在小间隙静电放电(ESD)中,电极移动速度和气体压强会对测量放电参数出现的低重复离散特性产生影响。基于自主研发的新型测试系统,完成气体压强变化和向放电靶移动电极放电相关参数的测量。静电放电模拟器移动距离控制范围在10cm-40cm。在间隙气体压强变化和放电枪以不同速度向靶移动放电的两种情况下,放电电流峰值和波形产生了显著的差异,证明了电极移动速度和空气压强都对放电参数产生显著影响。本文对放电参数受电极移动速度和气体压强变化而出现显著差异的可能机制进行了初步分析。 相似文献
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脉冲放电汽车尾气净化新技术研究及产品开发 总被引:6,自引:0,他引:6
本文根据气相反应动力学理论把脉冲放电活化技术应用于汽车尾气的处理,并研制出一种适用于各类汽油车辆尾气净化的脉冲放电汽车尾气净化器。 相似文献
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高压电气设备的绝缘结构长期处于工作场强作用下,在全部寿命期存在着一定强度的局部放电。局部放电测量及局部放电对设备的危害程度受海拔的影响较大。本文以6kV级高压电机线棒的局部放电特性随海拔变化的模拟试验结果,从理论上分析海拔对局部放电特性的影响,提出对局部放电测量进行海拔修正的建议,为高压电气设备的设计制造提供基础资料。 相似文献
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由于放电时延影响着二次放电的参数如放电电流、上升时间等,并对消费类电子产品的放电保护装置有着直接的影响。因此放电时延对放电过程以及器件放电保护有着非常重要的作用。通过测量时延分析了湿度、电压、电场强度、间隙大小等参数对时延的影响。这些实验结果对研究放电保护以及放电模型等都有着非常重要的作用。 相似文献
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臭氧对减少发动机排放污染物的分析与高效臭氧发生方法的研究 总被引:1,自引:0,他引:1
本文通过臭氧对汽车排放的影响和电感放电的特性的分析,介绍了新型电感放电装置控制电路的工作原理和高效放电指叉的工作方法。 相似文献
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基于已有自主研发的新型测试系统,提出一种静电放电中电极移动速度与温湿度变化对放电结果造成影响研究装置的设计方案,给出了基本原理和具体实现描述。该设计用于对小间隙静电放电(ESD)中电极移动速度和温度引起放电参数的低重复离散特性进行探讨。设计基于STM32的温湿度智能网络监控系统和智能控制PID算法实现了温湿度的智能控制,以满足用静电放电电极移动速度效应测试仪定量获得更准确实验结果的需要。该设计弥补和完善了现有静放电测试平台的不足,对于展开小间隙静电放电性质的深入研究具有重要的推动作用和现实意义。 相似文献
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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。 相似文献
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在水溶液中,以微波辅助无极汞灯(Microwave-Assisted Eletrodeless Discharge Mercury Lamp,MW-EDML)降解氯氰菊酯、甲氰菊酯和功夫菊酯等3种拟除虫菊酯农药(Synthetic pyrethroids,SPs),采用固相萃取(Solid Phase Extraction,SPE)富集后,用GC-MS鉴定降解产物,并根据降解产物重点探讨了SPs的降解机理。3种SPs的主要降解产物有6种,其降解途径有:酯键水解、氰基水解、脱羧、醚键断裂、氧化、苯环的羟基化以及与溶剂反应等。实验结果还表明:MW-EDML是个高效、简便的降解SPs类农药手段,可应用于其他有机污染物的降解过程。 相似文献
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Nathan Staley Tiffany Bright Rebecca W. Zeckoski Brian L. Benham Kevin M. Brannan 《Journal of the American Water Resources Association》2006,42(5):1153-1162
ABSTRACT: The Hydrological Simulation Program‐FORTRAN (HSPF) describes discharge from a stream reach based on function tables (FTABLES) that relate stream stage, surface area, volume, and discharge. For this study, five FTABLE scenarios were compared to assess their effect on daily discharge rates predicted using HSPF. Four “field‐based” FTABLE scenarios were developed using detailed cross section surveys collected at predefined intervals along 14 reaches in the study watershed. A fifth “digital‐based” scenario was developed using digital elevation models (DEMs) and Natural Resource Conservation Service (NRCS) Regional Hydraulic Geometry Curves. The Smirnov k‐sample test was used to compare average daily discharge rates simulated with HSPF using the five FTABLE scenarios. No significant difference in simulated stream discharge was found (p = 0.99) between the five FTABLE scenarios. Additional examination of the four field‐based scenarios revealed that the number of cross sections per stream reach used to generate FTABLES had little effect on the resulting stage discharge relationship. These findings suggest that FTABLES generated using digital data are a viable option when simulating stream discharge with HSPF and that if field data are used to generate FTABLES, using fewer cross sections will not adversely affect simulated discharge predictions. 相似文献
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Wayne M. Wendland Donna Watson-Stegner 《Journal of the American Water Resources Association》1983,19(2):175-182
ABSTRACT: Cores were obtained from several tree species located both on a river floodplain and a nearby terrace. A ratio of annual tree growth on floodplains to terrace growth was developed and shown to be related to the annual river discharge. Growth ratios from the time prior to written records can therefore be used to reconstruct river discharge and infer past unrecorded flood frequency. Oak and basswood ratios yielded the best models for discharge reconstruction, whereas those of elm and birch were less useful. This method permits reconstruction of river discharge from an assemblage of growth cores obtained within a relatively small area. 相似文献
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Dale A. Devitt David J. Donovan Terry Katzer Michael Johnson 《Journal of the American Water Resources Association》2002,38(6):1735-1751
ABSTRACT: An essential component to the ground water budget for the Las Vegas Valley (LVV) in southern Nevada is discharge from the ground water system. Discharge for the LW has been based on estimates made more than 50 years ago of 35,524,224 m3 per year as evapotranspiration (ET) and 0 m3 per year as subsurface outflow. Newly published values for recharge based on a more robust data set (70,308,360 m3) indicate a large imbalance associated with the earlier discharge estimates, providing the basis for the reevaluation conducted in this study. ET estimates in this study, as opposed to previous studies, were assigned a range in values that included an approach that assigned higher weight to the unique soil, plant, water, and climatic conditions that existed in predevelopment (1905) LW. The earlier discharge estimates also assumed that the basin was hydrologically closed; however, based on our evaluation, a range in yearly discharge by subsurface outflow from 1,480,176 m3 to 19,735,680 m3 could be assigned. Likewise, a range in yearly ET from 20,475,768 m3 to 78,819,372 m3 could be assigned. Based on newly published recharge values, closure can only occur if higher values are assigned to both the subsurface outflow and/or ET components of ground water discharge. We cannot provide a complete water balance closure with our ground water discharge estimate of 64,140,960 m3. However our reevaluation gives support to the higher recharge estimates and provides the rationale for future studies to be conducted based on a more rigorous scientific assessment. 相似文献
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Thomas J. Burbey Tamim Younos Eric T. Anderson 《Journal of the American Water Resources Association》2000,36(5):1161-1172
ABSTRACT: Discharge from flooded abandoned subsurface coal mines is considered a potential source for water supplies where other acceptable water sources are not available. The objective of this study was to develop procedures for determining sustainability of mine‐water discharge using rainfall and discharge data for a case study site. The study site is located in southwest Virginia where Late Paleozoic sequences of sandstone, coal, and shale predominate. A rain gauge and a flow rate monitoring system were installed at the site and data were collected for a period of 100 days. The recording period corresponded with one of the driest periods in recent years and, therefore, provided valuable information regarding the flow sustainability during baseflow conditions. From available data on underground mining patterns, geology, and ground water flow regimes, it was determined that a coal mine aquifer exhibits hydraulic characteristics very similar to the extremely heterogeneous systems observed in karst aquifers, and the mine discharge is analogous to springflow. Thus, techniques commonly used in karst‐water systems and springflow analysis were used to develop rainfall/mine‐discharge relationships. Springflow recession analysis was performed on five rainfall recessions and the coefficient for each recession was compared and interpreted in light of known geologic information. It was found that the recession coefficients described the mine discharge adequately and the mine aquifer response to a rainfall pulse was very similar to the response from certain types of karst aquifers. A cross‐correlation analysis was performed to verify the results of the recession analysis and to develop a “black box” statistical model for discharge data. The correlation analysis proved the validity of springflow recession analysis for mine discharge. The recorded data length was not adequate to create a statistical model, however, but a procedure was proposed for a statistical model that could be used with large flow records. For the study site, the mine discharge was found to be sustainable for a prolonged period of time. 相似文献
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侯兴儒 《环境保护与循环经济》2021,41(2):30-33
结合工业废水零排放实例,研究分析如何利用自动控制系统解决废水零排放系统中手动操作过多、智能化偏低的问题,探索如何提高自动化控制系统在废水零排放处理中的运行稳定性和可操作性。 相似文献