涂料原料和涂层厚度对反射隔热保温性能影响研究

通过研究涂料配方中所用乳液、颜料、常规填料和隔热填料在红外灯下的反射、隔热和保温性能，发现高折射率的二氧化钛和含有微孔的硅藻土具有最佳的反射和隔热保温效果，轻质碳酸钙和重质碳酸钙具有一定的隔热保温作用，而理论上具有隔热保温效果的填料海泡石等并没有预期的效果。涂层厚度对隔热保温效果具有一定影响，但是没有颜料和填料的影响大。隔热涂料使用的填料应含有硅藻土、二氧化钛以及一些常规的填料。     

降噪高分子材料及其应用

降噪材料按降噪机理可分为阻尼减振材料、吸声材料和隔声材料。降噪高分子材料可广泛应用于建筑、交通、化工和生活等各个领域。综述了降噪高分子材料的主要种类及其作用机理，并对高分子降噪材料的研究现状和应用情况作了简单的介绍。     

开放型电石炉绝缘问题浅见

介绍了开放型电石炉绝缘的结构特点，分析了绝缘材料的运行条件，讨论了绝缘系统的设计问题，提出了绝缘测试的三种方法。     

A song of ice and vessels: Seasonal trends in the soundscape of the western arm of Lake Superior

The soundscapes of marine systems have been studied for decades to determine spatial and temporal patterns of biological, geological, and anthropogenic activity. However, comparatively little is known about freshwater soundscapes. Lake Superior is the world’s largest freshwater lake by surface area and home to a variety of aquatic animals. The Twin Ports of Duluth and Superior, located in the western arm of Lake Superior, are annually closed because of ice cover, providing a unique opportunity to explore sound levels in the absence of vessel traffic. Passive acoustic monitoring was conducted over 15 months between November 2018 and March 2020 to investigate seasonal patterns. Sound pressure levels were significantly lower (8 dB) at low frequencies (<100 Hz) during the winter and spring months (when ice cover increased). Quieter ambient sound pressure levels may provide an acoustic refuge to soniferous animals, especially those that vocalise during winter spawning. During the ice-free months, commercial shipping introduces a near continuous source of sound, increasing sound levels by up to 25 dB (at frequencies < 1,000 Hz). Climate change is expected to further reduce ice cover and thickness allowing the shipping season into the Twin Ports to be extended, thus warranting concern about the effect of noise from vessel activity on aquatic life. This study provides a baseline of the soundscape in the western arm of Lake Superior, against which scientists and environmental managers can assess future changes to this important habitat.     

低萃取及B级聚酯绝缘膜研究 Ⅰ．国内研制动态

介绍了开发低萃取及B级聚酯(PET)薄膜的意义和要求,回顾了国内研制的情况,同时对其发展进行了讨论。     

钝感炸药在机械撞击下爆炸危险性评价

介绍了用炸药撞击声压级－实验药量曲线评价钝感炸药在机械撞击作用下发生爆炸的危险性的方法和测试结果，并与苏珊试验、滑道试验等测试结果进行了比较和讨论。     

新型绝缘树脂及应用

本文介绍了FUCHEM系列无溶剂绝缘树脂的性能及应用，着重探讨了产品的阻燃、低收缩、高耐腐蚀、高耐热等级等特性。     

新型绝缘树脂的应用

本文介绍了FUCHEM系列无溶剂绝缘树脂的性能及应用，着重探讨了产品的阻燃，低收缩，高耐腐蚀，高耐热等级等特性。     

10 kV配电线路运行防雷措施分析

随着经济的不断发展,我国的电力网规模在不断扩大,输配电事故也随之增加。根据相关调查,雷电是输配电事故发生的主要原因之一。对此,着重分析了输配电线路防雷保护的重要性,探讨了配电线路的具体防雷保护措施。     

基于LabVIEW的虚拟数字存储示波器的设计

利用 LabVIEW 强大的数据采集、处理和程序设计功能,设计、开发了一款数字存储示波器。它主要是由信号输入模块、数据处理模块和波形显示及存储模块组成,是通过软件编程实现信号的显示和测量等功能的。在虚拟示波器上集成的虚拟信号发生器可以在声卡采集和虚拟信号输入之间切换。实验结果表明,该虚拟示波器基本实现了传统示波器的功能,并且运行可靠、性能良好,能够满足普通实验室正常的使用需求。