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23261.基于热通量传感器测量的先进斯特灵转换器的性能
[电气机械和器材制造业,计算机、通信和其他电子设备制造业] [2013-12-21]
The U.S. Department of Energy (DOE) and Lockheed Martin Space Systems Company (LMSSC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system
for space science missions. This generator would use two high-efficiency Advanced Stirling Convertors (ASCs), developed by Sunpower, Inc., and NASA Glenn Research Center. The ASCs convert thermal energy from a radioisotope heat source into electricity. As part of ground testing of these ASCs, different operating conditions are used to simulate expected mission conditions. These conditions require achieving a particular operating frequency, hot-end and cold-end temperatures, and specified electrical power output for a given heat input. It is difficult to measure heat input to Stirling convertors due to the complex geometries of the hot components, temperature limits of sensor materials, and invasive integration of sensors. A thin-film heat flux sensor was used to directly measure heat input to an ASC. The effort succeeded in designing and fabricating unique sensors, which were integrated into a Stirling convertor ground test and exposed to test temperatures exceeding 700 °C in air for 10,000 hr. Sensor measurements were used to calculate thermal efficiency for ASC–E (Engineering Unit) #1 and #4. The post-disassembly condition of the sensors is also discussed.
关键词:传感器;;放射性同位素热源;热能量;薄膜
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23262.中国家电业进入新老交替期
[电气机械和器材制造业] [2013-12-20]
关键词:家电业;新老交替
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23263.空调行业进入盘整期或迎来新发展机遇
[电气机械和器材制造业] [2013-12-20]
关键词:空调行业;盘整期
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23264.家电业走出3D泡沫阴影
[电气机械和器材制造业] [2013-12-20]
关键词:家电业;3D
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23265.电气设备行业:“美丽中国”和新型城镇化引领结构性投资主题-年度投资策略报告
[电气机械和器材制造业] [2013-12-18]
电网:特高压和配电网景气度确定。传统电源:火电继续下滑,水电有超预期可能。新能源:光伏电站开发最受益,风电拐点引机会。轨道交通:近有高铁,远看车辆。节能:关注余热发电和EMC模式。
关键词:电网;特高压;配电网;传统电源;新能源;轨道交通;节能
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23266.固态特斯拉线圈及其用途
[电气机械和器材制造业] [2013-12-18]
The solid state Tesla coil is a recentlydiscovered high voltage power supply. It has similarities to both the traditional Tesla coil and to the modern switched-mode flyback converter. This report will document the design, operation, and construction of such a system. Possible industrial applications for the device will also be considered.
关键词:固态特斯拉线圈;高压电源
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23267.透明玻璃的3D打印
[非金属矿物制品业,电气机械和器材制造业,计算机、通信和其他电子设备制造业] [2013-12-18]
Traditional assembly line manufacturing is speculative, costly and environmentally unsustainable. It is speculative because it commits substantial resources—energy, materials, shipping, handling, stocking and displaying—without a guaranteed sale. It is costly because each of these resources—material, process, people and place—involves expense not encountered when a product is manufactured at the time of sale. It is environmentally unsustainable because, no matter how much recycling is done, not using the resources unless actually needed is always a better path. As part of the RAGNAROK (Research on Advancing Glass & Nonorganic Applications to Recreate Objects & Kinetics) project in HP Labs, we identified glass as a promising candidate for additive manufacturing based on 3-D printing methods. Glass is a silica-based material. With 90% of the earth’s crust composed of silicate minerals, there will be no shortage of silica resources. Glass is easy to recycle and is environmentally friendly. Glass is inexpensive but looks precious, is pleasant to the touch and is so familiar that customers will not be disappointed by its fragility— under certain conditions. A major need, and concomitantly a major challenge, for 3D printed glass is transparency. We will discuss several methods how to achieve it.
关键词:3D打印;透明玻璃
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23268.植入式的小型葡萄糖燃料电池
[电气机械和器材制造业] [2013-12-18]
The growth of power-constrained bio-medical and sensor applications has kindled increasing interest in energy-harvesting methods. Direct glucose fuel has emerged as a candidate of choice due to reliability and safety advantages. In this thesis, a 1mm2 miniaturized direct fuel cell is presented. The fuel cell provides a peak power density of 0.34uW/cm2 with an open voltage potential of 300mV. An analytical framework for the fuel cell as well as an example application in body touch interfaces will also be presented.
关键词:植入式;葡萄糖;燃料电池
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23269.无变压器非隔离型光伏并网逆变器漏电流抑制技术
[电气机械和器材制造业] [2013-12-15]
漏电流抑制是无变压器型光伏并网系统需要解决的关键问题之一。VDE-0126-1-1标准规定,漏电流高于300 mA时光伏并网系统必须在0.3 s内从电网中切除。为了解释漏电流的根源,建立系统共模电压数学模型,在此基础上分析漏电流产生的原因,探讨不同调制策略对漏电流的影响,然后介绍几种典型的、能够有效抑制漏电流的电路拓扑结构,并分析各种拓扑的工作原理和特点。最后对漏电流抑制技术方面的发展趋势做了展望。
关键词:无变压器;并网逆变器;光伏;共模;漏电流
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23270.基于车网耦合的高速铁路牵引网潮流计算
[电气机械和器材制造业] [2013-12-15]
针对全并联自耦变压器(autotransformer,AT)网线路的特点,建立通用的多导体链式电路模型。在此基础上,将高速列车视为恒功率负荷并进行迭代,形成了“机车一牵引网”(简称车网)的耦合模型。考虑AT漏抗值和钢轨的对地电阻,对3种不同工况进行潮流分析。仿真结果表明,车网耦合下的潮流计算能很好地反映实际的功率分布特性,并且全并联AT网上下行线路具有较好的对称性。牵引网潮流计算为分析高速铁路不同工况下的功率流动、电压分布奠定了基础,同时也可用于分析牵引负荷对公用电网电能质量的影响。
关键词:潮流计算;全并联自耦变压器网;车网耦合;迭代;算法