共查询到20条相似文献,搜索用时 93 毫秒
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论述了海底电缆登陆点及路径选择的基本原则、步骤及需调查的项目和方法,分析了影响海底电缆登陆点及路径选择的各种因素,介绍了海底电缆登陆点及路径选择设计过程中收集资料及勘测的内容,提出了海底电缆登陆点及路径选择的设计建议. 相似文献
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《Engineering & Technology》2009,4(4):52-55
What is happiness? One thing is for sure, it certainly is not complete plenitude. Imagine a world where there was no shortage of energy: where you could drive as far and as fast as you wanted at no cost, and could use as many appliances as you asked for and for as long as you wished. The total empowerment that would arise from that would be sickening. 相似文献
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燃煤电厂电除尘器设计中值得注意的问题 总被引:2,自引:0,他引:2
介绍了燃煤电厂电除尘器性能评价方法和设计中主要参数的取值原则和范围,指出了气流分布、振打清灰系统等主要部件设计中需要注意的问题,并给出了具体要求和指标。同时,还给出了高压硅整流电源二次输出电压、电流的选择以及保温的基本要求。 相似文献
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重点阐述了利用建筑中的结构钢筋进行防雷与接地、电气管线的预埋与结构布置中应当注意的问题及解决方法,探讨了屋面结构与接闪器,利用混凝土柱、墙主筋作为防雷引下线,利用基础地梁作为接地装置中存在的问题;垂直预埋管线在砌体结构承重墙和混凝土结构填充墙中的敷设问题;水平预埋管线在预制装配式楼板和现浇混凝土楼板中的埋设问题。 相似文献
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M. Bath 《Power Engineer (see also Power Engineering Journal)》2005,19(3):26-31
Power systems for military aircraft must tolerate extreme conditions: temperatures as low as -40/spl deg/C or as high as 70/spl deg/C, as well as short-term fluctuations from -55/spl deg/C to 180/spl deg/C; relative humidity as high as 100%; impacts reaching 60G. Difficult conditions can be tackled by using suitable materials and enclosure designs, but a system or unit's weight, size and shape are often governed by its location. These challenges are just the beginning. System reliability and availability are paramount as failures must be minimised at all times. To provide a reliable and safe power system for today's military aviators, many design teams are needed to tackle the architectural, electrical, mechanical and chemical parameters of power units. Exploiting emerging technical innovations, such as high-performance FETs, can only make life easier for designers of the future. 相似文献
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简要分析和介绍了变频器在工业自动化控制系统应用中应该注意的一些事项和它的基本选型原则,以便达到节能高效运行并充分发挥变频器应用功能的目的,在现场生产过程中尽量减少因设计考虑不周和选型不当而造成不必要的经济损失. 相似文献
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Raksapatcharawong M. Pinkston T.M. 《IEEE journal of selected topics in quantum electronics》1999,5(2):330-338
We review trends in interconnect bandwidth requirements for multiprocessor systems and technologies proposed to meet these requirements. The benefits and costs of core-based optoelectronic chips are discussed using CMOS-SEED implementations of the WARRP network router as a case study. Results indicate that transistor density and on-chip clock rates of optoelectronic core-based designs can be reduced by as much as 40% and 30%, respectively, but aggregate off-chip bandwidth can be increased by as much as an order of magnitude as compared to all-electronic chip designs 相似文献
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The objective of this article is to uncover as much as possible the origins and development of magnetobiology. The use of magnetobiology as a diagnostic tool and the technology associated with it such as biomedical MRI and magnetic source imaging are presented. Biomagnetism wherein excitable tissues are regarded as true generators of magnetic fields is also discussed. 相似文献
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格尔木~拉萨±400 kV直流输电线路工程7标段位于唐古拉山脉,沿线海拔在4 600~5 300 m之间,地形、地质、气象条件复杂恶劣,全线主要不良地质为季节性冻土和多年冻土。由于冻土是一种特殊的土体,冻土区的活动层中每年都发生着季节性融化和冻结,并拌有融沉、冻胀和各种不良冻土地质现象,以致冻土基础施工完毕,基础容易产生沉降和漂移,基础根开尺寸及高差控制难度较大。7标段冻土基础施工严格按要求进行冻土开挖、切实做好混凝土防冻、采取热棒和玻璃钢模板辅助措施、严格按设计要求回填土,从而使冻土区基础施工质量得到保证。 相似文献
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西北地区取用地表水作为电厂供水水源,都存在有三防(防冰、防沙、防水草)问题。本文根据多年来部分工程的调查及实地观测资料,对河流结冰过程、冰情演变和冰流量、冰厚的估算方法,以及目前电厂所采取的防治措施作了分析研究,提出了解决取水口结冰问题的途径。 相似文献
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沙角发电A厂200MW1号国产三排汽轮机,与现代汽轮机相比,性能已相当落后,严重影响了电厂的“创一流”达标,必须对其低压缸通流部分进行改造来提高机组效率,出力及降低能耗,为此,介绍了1号机汽轮低压缸通流部分改造的方案,改造过程中遇到的问题和对策,改造效果及一些经验性的建议。 相似文献