THE MICELLAR SOLUBILIZATION SPECTROPHOTOMETRIC DETERMINATION OF THE MICRO CHLORIDE IN THE WATER     

Li Heping  Zheng Zegen The Analytical  Thesting Centre 《保鲜与加工》1992,(1)

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THE STUDY OF SINGLE CHIP COMPUTER BASED SYMMETRICAL COMPONENT DISTANCE PROTECTION     

Zhuo Damin Zhong Minxiu 《保鲜与加工》1988,(2)

In this paper, a new microcomputer distance protection scheme with high property-cost ratio has been approached. The paper presents the performance equations based on the symmetrical components of current and voltage, proposes a new (1,a) coordinate plane and derives a Fourier symmetrical component algorithem with high accuracy and less calculation amount on the (1,a) plane. The protection program is debugged on the developing system of single chip computer. The digital imitation tests indicate that the proposed relaying system is satisfactory.  相似文献   

Relationship of Conservation of Historic Buildings and Urban Construction     

CHEN Wei  HU Bin 《保鲜与加工》2004,(5):19-22

The conservation of historic buildings and their environment is an unavoidable problem in urban construction. In this paper, the authors give a few new thoughts about the problem. First, the historic buildings are important part of the core power in city competition.Second,the conservation work should be combined with their development. Third, a classified and multilevel system of protection and reuse of old buildings should be set up.  相似文献   

Discussion on Tourism Development and Protection for Old Towns in Chongqing     

《保鲜与加工》2002,(6):17-20

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Exploring Harmonious Protection of Land Resources in City Construction     

DENG Meng  CHENG Wei 《保鲜与加工》2001,(4):1-5

Urbanization in China is at an essential point in its transformation from the initial stage to accelerating stage. With quick expansion of city scale and large occupation of land for urban construction, the contradiction between land resource shortage and people's living needs becomes more and more prominent. It has great affection on the grand plan of China's sustainable development of economy and society. How to adjust the relations between the development of urban construction and protect the land resource, promote the rational use of urban land, perfect and complete the protection system of land resource for improving the efficiency of urban land use. In order to conserve land resource and find a sustainable way for development of people's living and environment construction, the above mentioned problems are the most important issue for urban construction and important subject of this paper.  相似文献   

泵站继电保护设计方法     

梁修保 《排灌机械》2005,23(1):45-47

分析了进口、国产继电保护设备的不同，提出了对泵站继电保护二次回路的设计新方法。泵站二次设计可按照“单元”设置的原则，将泵站二次设计划分为10／6kV泵站进线、主机、站变、所变、联络等主要单元。  相似文献   

自熔性合金粉末在农业机械中的应用     

贾小艳  姚冠新 《农机化研究》2004,(4):172-174,177

采用氧乙炔喷焊工艺，制备农业机械特殊工况条件下的耐磨涂层，采用均匀试验对喷焊材料的组成进行设计，对涂层的组织和性能进行了研究分析。结果表明：该涂层具有良好的耐磨料磨损性能，比过去的工艺提高使用寿命3～8倍，具有很大的经济效益。  相似文献   

3MG-30型果园弥雾机的研制与试验   总被引：7，自引：0，他引：7  

张晓辉  郭清南  李法德  李修渠  赵东 《农业机械学报》2002,33(3):30-33

研制了一种与小四轮拖拉机配套的、适用于标准化果园植保作业的机载果园型弥雾机，对该机各项性能指标进行了试验与分析。试验结果表明，与其他类型喷头相比，按一定排列组合的空心雾锥喷头在与风机配合使用进行药液的2次雾化时具有更好的喷雾量分布和雾滴分布均匀性；小于35m/s的风机出口风速所产生的梯度气流使枝叶扭转与退让，并使雾滴的穿透性和树内沉积量增加，提高了作业质量和机组生产率。  相似文献   

东深供水改造工程泵站微机保护网络     

刘江啸 《中国农村水利水电》2003,(9):77-78

东深供水改造工程微机保护系统分为工业总线网络和光纤通讯两部分；工业总线网络采用了Profibus通讯协议，该协议具有反应时间短，抗干扰性强的特点；光纤通讯则具有反应时间不受电磁场和电磁辐射的影响等特点。  相似文献   

21世纪清洁能源-生物质能   总被引：1，自引：0，他引：1  

张林鹤  王春香  王丽君 《农机化研究》2005,(4):8-9

目前,能源和环境问题已成为国际性热点问题,引起人们的广泛关注。开发新能源,替代原油、天燃气和煤炭这3种常规能源,迅速地逐年降低它们的消耗量,已经成为人类发展中的紧迫课题。为此,在分析当前能源紧张局势以及环境保护紧迫性的基础上,论述了开发新型清洁能源—生物质能的可行性和利用技术,提出了我国生物质能源发展的必要政策保证。  相似文献