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广泛应用于我国地震台网上的 DJ-1型地震记录仪是一种交直流两用仪器 ,其外接直流电源普遍采用可以多次充放电的蓄电池。由于该仪器不具备自动充电功能 ,蓄电池的能量损耗需要根据实际使用情况不定期地进行人工补充。由于市电供、停的不规律 ,使蓄电池放电深度差异较大 ,补充电量不易掌握 ,从而导致充电不足或充电不及时引起蓄电池极板硫酸化、或因过充电造成蓄电池极板活性物质脱落而缩短其使用寿命。为了避免上述问题的发生 ,我们于 1 994年设计了一种 DJ-1型地震记录仪浮充电源。经河北电磁台网和地震台网等近 2 0台仪器长达几年时间的… 相似文献
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关键移动通信设备的地震易损性是城市移动通信系统地震灾害预测的基础。本文以移动通信系统节点机房中常用的蓄电池组作为研究对象，通过振动台试验来研究蓄电池组的抗震性能，并获得其地震易损性。试验过程中，首先采用FEMA P695建议的方法从美国PEER强震数据库中遴选出对蓄电池组较为危险的地震动记录作为试验激励，随后逐步增大各条地震动记录的幅值，基于振动台进行增量动力分析。试验后根据蓄电池组的地震损伤特征，定义了其损伤指标和损伤水平，并基于振动台试验数据分析获得了典型蓄电池组的地震易损性曲线。 相似文献
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对北京市凤河营等地震台智能电源管理下的蓄电池放电数据进行处理和分析,发现蓄电池电压"平缓—快速—平缓"的下降过程可以表征蓄电池老化程度的现象,获得蓄电池小电流放电条件下每次放电过程的估算容量数据,实证蓄电池放电容量与温度之间存在正相关关系,且发现同批次蓄电池可能存在较大程度的容量差异。及时的数据处理分析,对于准确把握蓄电池工作状态、保障台站供电安全、合理安排蓄电池更新事务,可以起到积极的作用。 相似文献
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蓄电池的选配使用与维护田树德郝淑琴冯玉霞杨增（中国河北０６５０００廊坊市地震局）１蓄电池的性能特点及合理选配目前,地震、地磁等观测仪器上使用的蓄电池主要有普通铅酸蓄电池、密封免维护铅酸蓄电池和密封圆柱型镉镍蓄电池三种类型。普通铜酸蓄电池分为干式非荷... 相似文献
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主要介绍了对蓄电池进行定期维护及容量测定的一种控制器的研设过程。实践表明,该控制器配合充电器,可以实现对蓄电池进行放电、修复、估算容量、自动充电等功能,并可以为判断蓄电池是否达到报废程度提供重要依据。同时,减轻了维护人员的工作量,提高了工作效率。 相似文献
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蓄电池设备由蓄电池、整流装置、逆变换装置等组成。本文叙述的试验是《电设工业》杂志1977年7月特大号刊登的蓄电池设备的试验结果和日本蓄电池工业会整理的技术资料SBA 6507整流装置的试验结果(1982年10月)。1.抗震试验的目的一般的抗震设计法采用的是修正烈度法,即:考虑到地震造成的地面加速度、建筑物的反应加速度以及设备反应的放大倍数,将其换算为静载地震系数,然 相似文献
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本文介绍一种适用于数字化遥测地震台网的不间断供电系统，它具有交直流不间断切换，输出满足数据采集系统及数据传输设备所需的各种电压要求，并能对备份蓄电池自动恒流、恒压转换充电及过放电保护，冗余量大、可靠性高。解决了无人值守遥测地震台的供电问题。对其它数字设备也有广泛的应用价值。 相似文献
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《地震地磁观测与研究》2015,(5)
抽检"十五"安徽地震监测台网一定比例台站供电UPS系统蓄电池组,使用数字检测仪对台站蓄电池(内阻、容量、电压)相关参数进行在线检测,并对检测参数分析汇总,应用定量化评估法,对台站UPS系统蓄电池运行质量与使用效率进行评估,提出完善与改进台站蓄电池使用率及维护方法与措施。 相似文献
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野外地震台应用固定式太阳电池组件系统,其太阳能电池组件和蓄电池组件的配置与太阳辐射量,平均发电量,年充电量密切相关,本研究了太阳辐射量,损失量,年充电量,组件串,并联功率计算公式,讨论了太阳能电池及阀控式铅酸蓄电池特点和实际应用情况。 相似文献
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磁流变阻尼器的两种力学模型和试验验证 总被引：41，自引：3，他引：41
本文根据我们设计制作出的磁流变阻尼器的阻尼特性试验结果，提出了描述阻尼器动态特性的两种新的力学模型。一种称之为修正的Bingham模型，它由Bingham单元（库仑摩擦单元与粘滞单元并联）与弹簧单元串联组成。该弹簧单元与磁流变液屈服前区的初始剪切模量和蓄能器的刚度等有关。另一种称为修正的Dahl模型，它采用Dahl模型来模拟库仑摩擦力，克服了常用的Bouc-Wen模型需要确定的参数过多的缺点。为了使模型在阻尼器的电流强度（磁场强度）改变的情况下仍然有效，引入一个内变量描述模型参数与电流强度（磁场强度）的关系。最后，通过理论分析与试验结果的比较，证明本文提出的两种力学模型能够较为精确地描述大多数的磁流变阻尼器在改变电流强度（磁场强度）情况下的动态特性。 相似文献
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Horizontal aquifer movement induced by groundwater pumping and its applications to the analysis of some geological disasters 总被引：1，自引：0，他引：1
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《Journal of Atmospheric and Solar》2002,64(16):1755-1764
The impact of telluric current activity on the corrosion control systems for pipelines in northern regions is examined. Three specific areas of concern are identified. These factors are corrosion of the pipe during positive cycles of the telluric disturbances, accurate measurement of cathodic protection performance parameters, and coating damage during negative cycles of the telluric activity. Corrosion rates are calculated versus the magnitude of the pipe potential change caused by discharging telluric current for different values of the Kp geomagnetic index. Methods of compensating and mitigating telluric current effects are discussed in the context of the cathodic protection design and monitoring procedures. 相似文献
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Observation of the operation of the Sanmenxia Reservoir on the Yellow River has led to the conclusion that to preserve a certain effective storage volume for reservoirs built on heavily silt-laden rivers is feasible if the reservoir is operated according to the principle known as "storing the clear water and discharging the muddy flow". The relative stability of the bed elevation at the end of the backwater and the reservoir's erosion and deposition equilibrium depend on the compatibility of the pool level maintained in non-flood seasons with the conditions of flow and sediment load during flood seasons. Operating the reservoir to regulate the flood and sediment load during flood seasons can reduce the rate of aggradation in the Lower Yellow River. The basic condition for applying the operation mode of "storing the clear water and discharging the muddy flow" is that a sufficient amount of water should be used for discharging sediment during flood seasons. Under the condition of extremely low flow years, reservoir sedimentation cannot be avoided even if this operation mode is adopted. 相似文献
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Mercury in Eledone cirrhosa from the Northern Tyrrhenian Sea: Contents and relations with life cycle
The Hg concentration in horned octopus was studied in relation to its biological cycle. The metal was measured in the muscle tissue of specimens of different size, sex and maturity. This species proved to be a strong accumulator of mercury, whose concentration was found to be correlated with length independently of the sex. The relationship with size was found also for the organic form. Consideration was given to the danger of frequent consumption of this cephalopod and to its use as a biomonitor of environmental mercury impact. 相似文献
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Kenneth E. Karp 《Ground Water Monitoring & Remediation》1990,10(3):199-203
Measurement of the vapor flux from volatile organic compounds (VOCs) provides a rapid means for screening large areas of potential contamination. The vapor flux is determined from the rate of VOC concentration buildup inside a 3.1L accumulator device that is sealed to the surface of the contaminated soil. After the VOC concentrations are allowed to increase for a few minutes, they are analyzed with a portable gas chromatograph or a total organic vapor analyzer.
The measurement approach was evaluated at a field site in an area where the ground water and soil had been impacted with Jet Fuel No. 4 (JP-4). An indication of the areal extent of impact was determined by mapping the surface VOC vapor flux. The pattern revealed by the flux measurements was found to coincide, in rough outline, with the known extent of toluene concentrations in the ground water and with conventional soil-gas survey results. In addition, a mathematical model describing VOC diffusion into the accumulator device was verified by performing laboratory measurements of the surface VOC vapor flux on a sandbox designed to simulate a hazardous waste site. 相似文献
The measurement approach was evaluated at a field site in an area where the ground water and soil had been impacted with Jet Fuel No. 4 (JP-4). An indication of the areal extent of impact was determined by mapping the surface VOC vapor flux. The pattern revealed by the flux measurements was found to coincide, in rough outline, with the known extent of toluene concentrations in the ground water and with conventional soil-gas survey results. In addition, a mathematical model describing VOC diffusion into the accumulator device was verified by performing laboratory measurements of the surface VOC vapor flux on a sandbox designed to simulate a hazardous waste site. 相似文献
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《Journal of Hydrology》1999,214(1-4):165-178
Karst aquifers are capable of transporting and discharging large quantities of suspended sediment, which can have an important impact on water quality. Here we present the results of intensive monitoring of sediment discharging from a karst spring in response to two storm events, one following a wet season and the other following a dry season; we describe temporal changes in total suspended solids (TSS), mineralogy, and particle size distribution. Peak concentrations of suspended sediment coincided with changes in aqueous chemistry indicating arrival of surface water, suggesting that much of the discharging sediment had an allochthonous origin. Concentrations of suspended sediment peaked 14–16 h after rainfall, and the bulk of the sediment (approximately 1 metric ton in response to each storm) discharged within 24 h after rainfall. Filtered material included brightly colored fibers and organic matter. Suspended sediments consisted of dolomite, calcite, quartz, and clay. Proportions of each mineral constituent changed as the aquifer response to the storm progressed, indicating varying input from different sediment sources. The hydraulic response of the aquifer to precipitation was well described by changes in parameters obtained from the particle size distribution function, and corresponded to changes seen in TSS and mineralogy. Differences between storms in the quantity and mineralogy of sediment transported suggest that seasonal effects on surface sediment supply may be important. The quantity of sediment discharging and its potential to sorb and transport contaminants indicates that a mobile solid phase should be included in contaminant monitoring and contaminant transport models of karst. Temporal changes in sediment quantity and characteristics and differences between responses to the two storms, however, demonstrate that the process is not easily generalized. 相似文献
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中国碳酸水出露带分布特征简介 总被引：3，自引：0，他引：3
本文举例阐述了我国碳酸水出露点的分布、水质特征及各类型碳酸水出露带的地震活动性,并探讨了二氧化碳的来源。认为深入研究碳酸水成因和分布特征对研究近代构造应力场、地震活动性、现代正在进行着的变质作用等是有意义的 相似文献