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所属行业:电力、热力、燃气及水生产和供应业

  • 14691.低成本金星使命的风能罗孚

    [电力、热力、燃气及水生产和供应业] [2014-09-02]

    Venus, with a surface temperature of 450 C and an atmospheric pressure 90 times higher than that of the Earth, is a difficult target for exploration. However, high-temperature electronics and power systems now being developed make it possible that future missions may be able to operate in the Venus environment. Powering such a rover within the scope of a Discovery class mission will be difficult, but harnessing Venus' surface winds provides a possible way to keep a powered rover small and light. This project scopes out the feasibility of a wind-powered rover for Venus surface missions. Two rover concepts, a land-sailing rover and a wind-turbine-powered rover, were considered. The turbine-powered rover design is selected as being a low-risk and low-cost strategy. Turbine detailed analysis and design shows that the turbine can meet mission requirements across the desired range of wind speeds by utilizing three constant voltage generators at fixed gear ratios.
    关键词:电压发生器;风力涡轮机;金星(行星);金星表面
  • 14692.新能源产业资讯——2014年第7期

    [电力、热力、燃气及水生产和供应业] [2014-09-02]

    报告从新能源相关定义、产业热点、产业研究、新能源相关数据等几个方面进行了分析评论。
    关键词:新能源;产业热点;产业研究;新能源数据
  • 14693.形势要点:内陆核电在“十二五”末期蠢蠢欲动

    [电力、热力、燃气及水生产和供应业] [2014-09-02]

    关键词:核电产业;煤矿;核电安全
  • 14694.原型尾气热交换器勘探EVA性能和制造特点

    [电气机械和器材制造业,电力、热力、燃气及水生产和供应业] [2014-09-01]

    NASA is developing new portable life support system (PLSS) technologies, which it is demonstrating in an unmanned ground based prototype unit called PLSS 2.0. One set of technologies within the PLSS provides suitable ventilation to an astronaut while on an EVA. A new component within the ventilation gas loop is a liquid-to-gas heat exchanger to transfer excess heat from the gas to the thermal control system s liquid coolant loop. A unique bench top prototype heat exchanger was built and tested for use in PLSS 2.0. The heat exchanger was designed as a counter-flow, compact plate fin type using stainless steel. Its design was based on previous compact heat exchangers manufactured by United Technologies Aerospace Systems (UTAS), but was half the size of any previous heat exchanger model and one third the size of previous liquid-to-gas heat exchangers. The prototype heat exchanger was less than 40 cubic inches and weighed 2.57 lb. Performance of the heat exchanger met the requirements and the model predictions. The water side and gas side pressure drops were less 0.8 psid and 0.5 inches of water, respectively, and an effectiveness of 94was measured at the nominal air side pressure of 4.1 psia.
    关键词:温度控制;热交换器;气体交换;大气压力
  • 14695.太阳能燃料生产的催化剂优化:关键反应中间体的光谱表征

    [电力、热力、燃气及水生产和供应业] [2014-08-31]

    The purpose of this grant was to develop a new and general way to isolate key reaction intermediates in the condensed phase catalytic conversion of carbon dioxide and water into transportable solar fuels. To this end, we designed, constructed and implemented a chemical analysis apparatus to extract homogeneous catalysts from their native solution environment and isolate them for spectroscopic study. This was achieved using an electrospray atmospheric pressure interface to a custom built, multi-stage, cryogenically cooled photofragmentation mass spectrometer. The key advance incorporates a 10K processing stage, which freezes ions into well defined structures and coats them with an inert layer of weakly bound adducts. These cold aggregates were then complexed with target molecules to initiate chemical rearrangements under conditions where the reactions could be arrested prior to completion by rapid evaporation of the cryogenic solvent.
    关键词:催化剂;光谱;团聚体(材料);拦阻(过程);二氧化碳
  • 14696.全球核电市场报告(2014-2018年)

    [电力、热力、燃气及水生产和供应业,石油加工、炼焦和核燃料加工业] [2014-08-30]

    A nuclear power plant converts heat produced by nuclear fission reaction into electricity, using uranium as fuel. The heat thus produced is used to convert water into steam, which drives the turbo generator to generate power.
    关键词:核能电厂;热量;核裂变反应;转化电能;铀
  • 14697.全球LED工业照明市场报告(2014-2018年)

    [计算机、通信和其他电子设备制造业,电力、热力、燃气及水生产和供应业] [2014-08-30]

    An LED is a semiconductor that emits visible light. LEDs were initially used as indicators in various applications. Later, they were used to display numbers in electronic meters and sign boards. Currently, LEDs are used in almost every application that uses lighting systems. The control that users have over LEDs in terms of luminescence and power consumption has made them popular in industry applications.
    关键词:LED;半导体;发光二极管
  • 14698.全球气-液GTL市场报告(2014-2018年)

    [电力、热力、燃气及水生产和供应业] [2014-08-29]

    GTL is a refinery process of converting natural gas into long chain hydrocarbon products such as diesel and gasoline. Natural gases are converted into liquid fuels either via direct conversion or by using syngas as an intermediate.
    关键词:GTL;天然气;转化;长链烃类产品;柴油和汽油
  • 14699.环球网优化解决方案市场报告(2014-2018年)

    [电力、热力、燃气及水生产和供应业] [2014-08-29]

    Grid optimization involves a wide array of advances that give utilities and grid operators digital control of the power delivery network. Although the concept of network optimization is simple, the practice is complex because it involves multiple variables and compensation. Rising demand, lack of predictability of renewable resource generation, volatile energy costs, and the emergence of electric vehicles are the factors that threaten network stability. Utilities have to predict and diagnose potential problems and take decisions to provide high quality and reliable services. Grid Optimization is an umbrella term that refers to improvements in three main areas.
    关键词:电网优化;公用事业;电网运营;控制;电力输送;网络
  • 14700.全球输电塔市场报告(2014-2018年)

    [电力、热力、燃气及水生产和供应业] [2014-08-29]

    A transmission tower is the main supporting unit of overhead transmission lines and is known by different names in various parts of the world. In the UK and some parts of Europe, it is known as an electricity pylon, and in Canada, it is called a hydro tower. The design of a transmission tower involves three disciplines of engineering, civil, mechanical, and electrical, as it serves the purpose of supporting electrical wires that are heavy and are required to be connected at a certain distance from the ground. Also, it is necessary that these towers are able to withstand natural calamities such as storms.
    关键词:传输塔;输电线路;工程;土木;机械;电气
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