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通过起重机械选择、吊点确定和吊索具选择、安全距离分析、地基承载力分析、风载荷计算等关键因素的分析,研讨第三代压水堆核电机组钢制安全壳顶封头吊装技术,并分析AP1000钢制安全壳顶封头吊装的安全性、控制要点及吊装的工艺流程。 相似文献
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本文根据以人为本的原则，对现在普遍使用的图书馆书架进行改进设计和重新设计，使书架更便于读者和工作人员使用，并在同等场地、空间下，钢制书架提高利用率40％，木制书架提高利用率30％。 相似文献
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超高层外立面装饰混凝土结构的线条,为达到免粉刷效果,其模板加固体系是混凝土观感质量的控制关键,采用钢木结合及制作定型卡具的方法,可以达到该效果,并大大提高了劳动效率,减少了成本投入. 相似文献
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2011年12月,科学家宣布发现生活在深海的普氏雪人蟹能在自己毛绒绒的前爪(螯肢)上培育细菌,并以此作为主要食物来源。此前科学家曾发现深海虾和其他动物身体上生长细菌,但这是首次掌握深海动物培育细菌的证据。目 相似文献
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It is promising to simultaneously develop multiple products through the combined utilization of sea-water by solar chimney technology. A small scale experimental system was set up. The collector temperature, the seawater temperature, and the temperature and humidity of the airflow under the collector were measured. Thermal network analysis of the system was carried out. The results show that the airflow is nearly saturated at the entrance of the chimney, and the mean dry-bulb and wet-bulb temperatures of the airflow have increased by 8.4℃ and 9.6℃ respectively. The radiation heat transfer between the collector and the sky is the biggest heat loss in the system, which is up to 29.1% on average of the solar energy. However, the water evaporation heat is about 23.6% on average of the solar energy. To reduce the heat loss and enhance the water evaporation, it is necessary to reduce the emissivity and thermal conductivity of the collector and increase the evaporation areas. 相似文献