抗电击穿装置的容量指标问题

本文着重阐述了交流抗电击穿装置的容量指标问题，在确定抗电击穿装置的容量时，不公要考虑到被试样件两极间的等效电容值，同时还要估计到试件在击穿过程可能产生的最大击穿电流值，对于某种绝缘材料或构件，合理地选用抗电击穿装置的容量对正确进行试验是很重要的。     

击穿抗电装置的容量指标

目的 根据影响介质击穿的主要因素,阐述了交流出穿抗电装置的容量指标问题。方法 在确定击穿抗电装置的容量时,不仅要考虑到被试样件两极间的等效电容值,同时还要估计到样件在击穿过程可能产生的最大击穿电流值。结果与结论 对于某种绝缘材料或者构件,合理选定抗电击穿装置的容量对正确进行试验是很重要的。     

天然气冷热电三联供系统设备容量优化

天然气冷热电三联供系统能够有效利用资源,在当今能源日益短缺的情况下,使其能源利用率尽量加大,不过大增加环境负担的优势受到了世界重大关注。天然气冷热电三联供系统由发电机、制冷机和制热机三个部分组成,为了保证经济效益,应当选用合适的设备匹配和制定相对应的运行策略对设备容量进行优化。     

出租汽车税控计价器电快速瞬变脉冲群抗扰度试验的方法

本文针对《出租汽车税控计价器定型鉴定大纲》第5.9.2.3款和第7.9.2.3款电磁兼容试验中规定的电快速瞬变脉冲群抗扰度方法提出了具体实施和操作性较强的试验方法。     

抗缩放攻击的高水印容量数字水印算法

目的 为了增加水印算法的可嵌入水印信息容量,解决抗高强度缩放攻击等问题,提出一种基于圆形角度模板的抗缩放攻击、高水印容量的数字水印算法。方法 首先将原始水印信息转换为QR码,根据QR码生成原理提取其数据编码,并进行分组,再将分组的编码转换为角度信息;随机生成具有方向性和周期性的基础圆形模板水印,根据角度信息对其进行旋转,生成待嵌入的圆形角度模板水印;通过修改图像的最小可察觉误差完成水印信息的嵌入;通过检测模板水印中的角度信息,提出水印信息。结果 实验结果表明,该算法不仅可有效抵抗高强度的缩放攻击,同时还可以抵抗色彩调整、旋转、压缩、噪声、滤波、模糊等攻击。此外,该算法可实现较高容量的水印信息嵌入和无损提取。结论 通过对水印信息预处理和圆形角度模板水印的应用,不仅使得该算法具备高水印容量,而且可有效抵抗高强度缩放攻击,在抵抗色彩调整、旋转等图像处理攻击方面同样具备较强的鲁棒性,能满足实际应用需求。     

如何正确判断电能表电快速瞬变脉冲群抗扰度试验的结果

本文通过实例分析 ,对《全电子式电能表定型鉴定大纲》第 5 4 3条a款试验提出补改意见     

耐电压测试仪的击穿电流和容量测试法的研究

本文论述了在检定耐电压测试仪的击穿电流误差和容量时,设计出新的电阻器结构,同时满足这两项检定对电阻的阻值及负载能力的要求;在测试击穿电流时,也采取固定电阻,调节电压,使其与容量测试方法相同,达到减少测试设备数量和测试方法的相统一。     

出租汽车税控计价器电快速瞬变脉冲群抗扰度试验的方法

本文针对《出租汽车税控计价器定型鉴定大纲》第 5 .9.2 .3款和第 7.9.2 .3款电磁兼容试验中规定的电快速瞬变脉冲群抗扰度方法提出了具体实施和操作性较强的试验方法。     

油压装置的容量选择计算

本文针对水电站接力器的大小及机组的运行要求,对整个系统的用油量进行准确计算,以设计出满足要求的油压装置。     

三等金属量器容量检定装置的研究及开发

标准金属量器在能源计量中起着重要的量值传递作用。文章以多型号金属量器容量检定为研究对象,在现有检定手段和方法的基础上,利用先进的计算机监控及数据处理技术,开发出三等金属量器容量检定装置。主要研究内容包括标准装置总体方案的规划、管路设计、下位机控制系统及上位机数据处理程序的编写。     

A hydrodynamic model of the electric strength of dielectric diodes

A model of the electric breakdown of thin-layered metal-dielectric-metal structures, used to choose the working parameters and for the diagnostics of solid-state microelectronic devices, is described. __________ Translated from Izmeritel’naya Tekhnika, No. 8, pp. 53–56, July, 2008.     

Bioinspired Synthesis of Monolithic and Layered Aerogels

Aerogels are the least dense and most porous materials known to man, with potential applications from lightweight superinsulators to smart energy materials. To date their use has been seriously hampered by their synthesis methods, which are laborious and expensive. Taking inspiration from the life cycle of the damselfly, a novel ambient pressure‐drying approach is demonstrated in which instead of employing low‐surface‐tension organic solvents to prevent pore collapse during drying, sodium bicarbonate solution is used to generate pore‐supporting carbon dioxide in situ, significantly reducing energy, time, and cost in aerogel production. The generic applicability of this readily scalable new approach is demonstrated through the production of granules, monoliths, and layered solids with a number of precursor materials.     

疲劳振动对瓦楞纸板承载能力与缓冲性能的影响

对瓦楞纸板进行疲劳振动试验,测定分析振动次数、加速度对瓦楞纸板承载能力、缓冲性能的影响,并与未经振动材料进行比较.结果表明,随着振动次数、振动加速度的增加,瓦楞纸板剩余屈服应力减小,缓冲系数增大,其中在小应力阶段缓冲系数变化不大,在大应力阶段,缓冲系数显著增大.进行频率20Hz、加速度为2.0g、80000次振动试验后,瓦楞纸板承载能力下降了38.88%,静态应力0.012MPa下的缓冲系数增大了46.37%.缓冲包装设计时,应考虑疲劳效应对瓦楞纸板衬垫缓冲性能的影响,以确保实现预期缓冲包装的要求.     

疲劳振动对蜂窝纸板承载力和缓冲性能的影响

对蜂窝纸板进行疲劳振动实验,测定分析振动次数、加速度对蜂窝纸板承载力、缓冲性能的影响,并与未振动纸板进行比较.结果表明,随着振动次数和振动加速度的增加,蜂窝纸板剩余屈服应力减小,缓冲系数增大,蜂窝纸板的缓冲性能有所下降.缓冲包装设计时,应考虑疲劳振动对蜂窝纸板衬垫缓冲性能的影响,以确保实现预期缓冲包装的要求.     

Enhanced Interfacial Magnetization is Responsible for the Negative Capacity Fading of Cobalt Ditelluride Anodes for Lithium Storage

In lithium-ion batteries (LIBs), the stabilized capacities of transition metal compound anodes usually exhibit higher values than their theoretical values due to the interfacial charge storage, the formation of reversible electrolyte-derived surface layer, or interfacial magnetization. But the effectively utilizing the mechanisms to achieve novel anodes is rarely explored. Herein, a novel nanosized cobalt ditelluride (CoTe₂) anodes with ultra-high capacity and long term stability is reported. Electrochemical tests show that the lithium storage capacity of the best sample reaches 1194.7 mA h g⁻¹ after 150 cycles at 0.12 A g⁻¹, which increases by 57.8% compared to that after 20 cycles. In addition, the sample offers capacities of 546.6 and 492.1 mA h g⁻¹ at 0.6 and 1.8 A g⁻¹, respectively. During cycles, CoTe₂ particles (average size 20 nm) are gradually pulverized into the smaller nanoparticles (<3 nm), making the magnetization more fully due to the larger contact area of Co/Li₂Te interface, yielding an increased capacity. The negative capacity fading is observed, and verified by ex situ structural characterizations and in situ electrochemical measurements. The proposed strategy can be further extended to obtain other high-performance ferromagnetic metal based electrodes for energy storage applications.     

雷达吸波材料性能测试

雷达吸波材料性能测试技术是雷达吸波材料必不可少的研究手段。本工作介绍了常用的雷达吸波材料测试方法和测量系统及开展吸波材料研究需要进行哪些测量工作及常用的测量方法。本工作介绍的雷达吸波材料测试方法包括：吸收剂电磁参数测量、雷达吸波材料反射率测量。     

正极材料LixMn2O4容量在循环过程中的损失机理研究

正极材料LixMn2O是近几年锂离子电池研究的热点，但其在循环过程中容量衰减是制约锂离子电池商吕化的关键，LixMn2O4的溶解，晶型转变，过充和过放地导致正极材料LixMn2O4循环过程中容量损失的关键因素，概述了近几年在这方面的研究的研究进展，并提出了当前解决问题的一些途径。     

Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

Dielectric elastomers are possible candidates for realizing products that are in high demand by society, such as soft robotics and prosthetics, tactile displays, and smart wearables. Diverse and advanced products based on dielectric elastomers are available; however, no elastomer has proven ideal for all types of products. Silicone elastomers, though, are the most promising type of elastomer when viewed from a reliability perspective, since in normal conditions they do not undergo any chemical degradation or mechanical ageing/relaxation. Within this review, different pathways for improving the electro‐mechanical performance of dielectric elastomers are highlighted. Various optimization methods for improved energy transduction are investigated and discussed, with special emphasis placed on the promise each method holds. The compositing and blending of elastomers are shown to be simple, versatile methods that can solve a number of optimization issues. More complicated methods, involving chemical modification of the silicone backbone as well as controlling the network structure for improved mechanical properties, are shown to solve yet more issues. From the analysis, it is obvious that there is not a single optimization technique that will lead to the universal optimization of dielectric elastomer films, though each method may lead to elastomers with certain features, and thus certain potentials.