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概述了同轴电缆的湿度特性,分析了水分对于同轴电缆性能的影响,讨论了同轴电缆的防水防潮措施和检测判别方法. 相似文献
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防潮性能是扬声器纸盆生产中的一个重要问题。在实际生产中往往由于夏天霉雨季节,纸盆防潮性能严重变坏,造成扬声器的声性能下降。因而不少扬声器厂都将纸盆防潮问题视为生产中的一个重要问题。 相似文献
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传统方法检测电气设备故障时,存在检测准确率低、耗时长的问题。为此提出基于激光成像技术的电气设备故障自动分类方法。对电气设备图像进行对比度拉伸处理,并采用滤波对其进行去噪处理,以提升对设备故障区域的检测能力,即故障区域在激光图像中亮度过大;利用脉冲耦合神经网络,将处理的激光图像过亮区域进行提取,获得电气设备故障区域,可通过激光图像中故障区域的亮度,实现电气设备故障类型的诊断和自动分类。真实验证明,研究方法的故障诊断性能较高,分类结果较为准确,且实现了非人工故障识别和分类,分类运行时间明显缩短。 相似文献
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《安全与电磁兼容》2020,(3):109-110
中国电子技术标准化研究院安全实验室(以下简称安全室)主要开展音视频设备、信息技术设备、通信技术设备、测量/控制和实验室用电气设备、电池等产品的安全、环境、可靠性等试验检测,出具委托试验报告、CCC检测报告和国际认可的CB报告、CE报告。承担全国电子产品安全标准技术委员会(筹)、工信部锂离子电池安全标准特别工作组秘书处工作,负责IEC/SC 21A、IEC/TC 56、IEC/TC 66、IEC/TC 108的国内技术归口,是全国测量、控制和实验室用电气设备的安全标准化技术委员会、全国小型熔断器标准化技术委员会、全国小型变压器标准化技术委员会主任或副主任委员单位。 相似文献
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常规方法在检测电气设备异常振动状态时,存在检测耗时较长、检测误差较大、准确率较低的问题。针对这一问题,本研究引入现场总线通信技术,设计了新的高压电气设备异常振动状态检测方法。首先,利用振动传感器实时采集电气设备的振动信号。然后,利用小波变换原理与超高频方法原理,建立高压电气设备超高频信号模型,对振动信号实施去噪处理。最后,基于现场总线通信技术监测高压电气设备局部放电过程中的超高频信号变化,检测电气设备异常振动状态。实验表明:该方法能够在较短的时间内,准确检测出高压电气设备潜在的异常振动隐患,检测准确率达到98%以上,检测效果显著。 相似文献
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在煤矿企业中,电动机作为主通风机、压风机、主排水泵、提升机等重要大型固定设备的动力使用,对于煤矿安全生产发挥着重要作用.长期以来,电动机在正常的使用过程中存在重运行监控、轻后期维护管理的普遍现象.若绝缘检测和自动防潮除湿作为电动机后期管理内容不受重视,致使电动机的绝缘性能变化不能及时被发现,受潮电机得不到及时处理,因而... 相似文献
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35KV高压开关室开关设备是电力系统的重要设备之一,其运行状态对电力系统的可靠性有着重大的影响.本文通过分析研究现有防潮除湿的方法的不足之处,通过对现有35KV高压开关室的门窗进行结构及自动化改造,提高它的保温性能、密封性能,并研制了一种集数字化于一体的环保型高可靠性人机界面防潮除湿监控及控制系统. 相似文献
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A mid-infrared carbon dioxide (CO2) sensor is presented for the application in greenhouse environment. An integrated multi-pass gas chamber and a dual-channel differential detection method are adopted to decrease response time and suppress environmental influence, respectively. An optical module is developed using a cost-effective wideband mid-infrared light source, a dual-channel pyre electrical detector and a spherical mirror, and the moisture-proof function is specially designed for enabling the application of this sensor in greenhouse with high humidity. Experiments are carried out to evaluate the sensing performance on CO2 concentration. According to the experimental results, the limit of detection (LoD) is about 3´10-5 with an absorption length of 30 cm. The relative detection error is less than 5% within the measurement range of 3´10-5—5´10-3. Based on 10 h long-term stability measurement on 5´10-4and 2´10-3 standard CO2 samples, the maximum fluctuations are 1.08% and 3.6%, respectively. By using a 2.4 GHz wireless network communication system for remote monitoring and data recording, a field measurement of this sensor in a greenhouse is conducted, and good performance is proven in such circumstance. 相似文献
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基于航空电子系统射频综合实验室的需求,应用圆锥喇叭天线的传输原理和宽频带波导的匹配特性,研制了一种宽带双极化四脊圆喇叭天线。对其工作原理、性能及电气结构进行了分析与设计,实际制作了一批宽带双极化四脊圆喇叭天线并对其进行了调试,电性能参数优良,实测结果与设计基本一致:此天线在C,X,Ku波段内具有大于3倍频程的宽带匹配特性,相当高的交叉极化隔离度(B>22 dB)和高的增益(10 dB~20 dB)。结果表明该方法是正确和有效的。 相似文献
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Anki Reddy Mule Bhaskar Dudem Sontyana Adonijah Graham Jae Su Yu 《Advanced functional materials》2019,29(17)
Triboelectric nanogenerators (TENGs) are gaining much research interest recently owing to their facile and cost‐effective device structure. However, the effect of relative humidity (in moisture atmosphere) on the output performance still needs to be resolved. Herein, a pouch‐type TENG is proposed to significantly reduce the effect of relative humidity on its electrical output and a stable performance is also attained in a humid environment. In this regard, a dielectric and dielectric materials‐based TENG (DD‐TENG) is first developed using nanoarchitecture polydimethylsiloxane (NA‐PDMS) and multiwalled carbon nanotube/nylon composite layers as a triboelectric material with the negative and positive tendencies, respectively. The NA‐PDMS and nylon composite layers play a key role in increasing the surface contact area and surface charge density between the dielectric/triboelectric materials as well as the output performance of DD‐TENG. However, the DD‐TENG device exhibits a stable and high output performance with the effective output power density of ≈25.35 W m?2. Additionally, the performance of the pouch‐type DD‐TENG device is not almost affected even though the relative humidity is increased from 35 to 81%, while it is dramatically decreased for the nonpouch‐type device. Finally, the pouch‐type DD‐TENG is employed as a wearable device to effectively harvest the mechanical energy from daily human activities. 相似文献
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A Synergistic System for Lithium–Oxygen Batteries in Humid Atmosphere Integrating a Composite Cathode and a Hydrophobic Ionic Liquid‐Based Electrolyte 下载免费PDF全文
Shichao Wu Jing Tang Fujun Li Xizheng Liu Yusuke Yamauchi Masayoshi Ishida Haoshen Zhou 《Advanced functional materials》2016,26(19):3291-3298
Moisture in air is a major obstacle for realizing practical lithium‐air batteries. Here, we integrate a hydrophobic ionic liquid (IL)‐based electrolyte and a cathode composed of electrolytic manganese dioxide and ruthenium oxide supported on Super P (carbon black) to construct a promising system for Li‐O2 battery that can be sustained in humid atmosphere (RH: 51%). A high discharge potential of 2.94 V and low charge potential of 3.34 V for 218 cycles are achieved. The outstanding performance is attributed to the synergistic effect of the unique hydrophobic IL‐based electrolyte and the composite cathode. This is the first time that such excellent performance is achieved in humid O2 atmosphere and these results are believed to facilitate the realization of practical lithium‐air batteries. 相似文献
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塑封集成电路离层对可靠性的影响及解决方法 总被引:2,自引:2,他引:0
塑封集成电路因其是非气密性封装,封装材料热膨胀系数的不同以及被粘接材料表面能低,是造成塑封电路离层或开裂的内部原因。通过选择特殊的封装材料(特别是框架材料)和工艺可以解决离层或开裂问题,大大提高塑封集成电路的稳定性和可靠性。水汽是造成塑封集成电路离层或开裂的外部原因,可以通过驱除和防潮措施来解决。要提升塑封集成电路可靠性,必须从技术和工艺上解决塑封电路离层或开裂问题。我们在这方面做了有益的尝试,取得了良好的效果,为拓展塑封集成电路的应用领域创造了条件。 相似文献
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Theoretical and experimental results on the code design and bit error rate (BER) performance of a digitally encoded lightpath labeling system for multiwavelength photonic networks are reported. For low cost, the shared label receivers operate without wavelength filters, relying on electrical code-division multiple access (CDMA) techniques to resolve the labels from various wavelengths. Code designs capable of operating in noise-limited networks with up to 80 wavelengths are presented, and the tradeoff between complexity and coding overhead is explored. Multiwavelength laboratory experiments show a good agreement with theory. The BER performance of a decorrelating decoder is shown to exceed that of a conventional decoder for systems with large wavelength counts. 相似文献