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Luo Shushan 《保鲜与加工》1991,(4)
Based on the contributing factors of earthqutake,its hazardregularity and the site investigation at Tongjing town in Chongqing,thispaper presents suggestions on the basis,principle and aim of earthquakeplanning in mountainous region,cities and towns as well as site selection,general layout of city,building arrangement,road width and quakeproofsafe area establishment,etc, 相似文献
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This paper presents the application of sand-gravel-cushion technique in thefoundation of mountainous area inhomogeneity and analyges non-uniformity of the foundation inmountainous,It is different from the traditional theory of sand-cushion,This is a new developmentand able to make a full use of the rock debris fill and the combinational soil-rock foundation in the mountainous areas. 相似文献
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文章综述了中国粮食仓储业粮库建设、安全储粮技术和流通设施的现状.指出了必须依靠科学技术,统一规划,科学布局,加强创新,集约化发展现代化国家粮食储备库,配合粮食流通体制改革,推动粮食流通现代化新模式,促进粮食仓储业适应21世纪粮食生产、消费、人口和经济发展的需要,实现可持续发展。 相似文献
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春谷幼穗发育阶段与叶龄指数关系的研究 总被引:2,自引:0,他引:2
经三年观察研究,十个不同熟性春谷品种的幼穗发育开始时间是随着它们生育日数长短而变化,并与拔节始期有着密切的关系.同时,春谷不同熟性品种的叶龄指数又与幼穗发育阶段呈回归直线关系.因此,春谷不同熟性品种利用其叶龄指数,求出适宜的系数,再代入改进的直线回归关系式,即可以较准确地判断出谷子的幼穗发育阶段. 相似文献
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用方差—协方差分析估计某一样本两个性状的遗传相关时,经常会遇到相关系数大于“1”的情况,从而造成遗传相关阵是非正定的.研究查明,这是由于基因型与环境的互作过大所造成的偏倚.作者将G×E剖分为遗传的和环境的两个部分,修改了常规的统计模型,可以避免遗传相关系数大于“1”的情况. 相似文献
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accordance with the problems, occurred in the mountainous city's construction, especially
the crises such as the destruction of ecological and humanistic environment, the loss of
traditional culture and characteristics and the disorder of urban structure, this paper
discusses the distinctive landscape characteristic of mountainous city thoroughly. 相似文献
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高山生态型玉米品种生理特性研究 总被引:3,自引:1,他引:3
试验研究结果表明,高山生态型玉米品种与平原生态型玉米品种的叶片的构造,叶绿素含量、比叶重、干物质积累与分配、光合强度、净同化率、灌浆速度,粒叶比等重要生理特性均有明显差异。高山生态型玉米品种叶片表皮毛较多,毛短,叶片气孔数目少,气孔也小;平原生态型玉米品种表皮毛较多,且毛较长,叶片气孔多,气孔也大。高山生态型玉米品种的叶绿素含量、比叶重、干物量。转运率、光合强度、净同化率、粒叶比等主要生理指标均低于平原生态型玉米,但灌浆速度则是高山生态型玉米快,而平原生态玉米较慢。 相似文献
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Wang Jiayin Chi Jinghao 《保鲜与加工》1988,(4)
The changes of Al2O3 and the properties, such as basicity, metting point and viscosity, of the mould flux when continuously casting the steels containg Al are discussed.
In order to obtain a stable quality in the flux, the functions of content MnO are also studied. As a result, a reasonable composition of flux for this purpose is suggested. 相似文献
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应用AMMI模型对2002~2009年贵州省粳稻区域试验品种(组合)产量相关性状基因型与环境效应分析结果表明:基因型、环境、基因型与环境互作对考察的7个性状影响程度各不相同,生育期、有效穗主要受环境影响,株高主要以基因型效应和环境效应为主,穗粒数、结实率和千粒重同时受基因型、环境、基因型与环境互作影响,但环境效应相对较大,对产量影响的大小顺序为基因型与环境互作>基因型>环境。在贵州山区粳稻育种中,需针对基因型、环境、基因型与环境互作效应进行产量相关性状选择,以提高育种效率。 相似文献
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Qin Shuren Wang Jiachen Hu Xinyi Jiang Guongcheng 《保鲜与加工》1990,(1):1-12
The paper introduces a new method-QL system suggested for the first time by the author for measuring dynamic accuracy of gear cutting machine drivetrain. The system has many uses. It suits not only the measurement of mid-size machine tool but also the measurement of very slow speed, large ratio, large-size machine drivetrain 相似文献
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Yao Jiafei 《保鲜与加工》1994,(2)
This paper discusses the model for lifting capacity of the crane and optimal con-trol of eliminating swing in lifting process. One half loop control method is presented, which is onlyto examine and measure the trolley speed for eleiminating swing.The fact shows this methOd is sim-ple and practicle for enginceering. 相似文献
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针对麦棉套种的辐射竞争矛盾,结合气象学理论,初步建立了以棉行接受太阳直达辐射累积时间为主体的麦棉套种微气候学计算机模型。模拟结果表明,对棉花而言,东西行套种棉行受光较多,而南北行向则较少,小麦株高太高和预留棉行太窄,均会增加棉行的遮荫时间。理论分析认为,采用东西行种植,选择矮杆小麦品种或适时对小麦进行化学调控,起高垄种棉,用棉花育苗移栽方法缩短麦棉共生期等措施,皆有利于培育壮苗,为获得高产打下良好基础。 相似文献
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Wang Caihua Zhu Yudong 《保鲜与加工》1992,(6):92-97
A processing method for the weight of the object in the fuzzy solving method for the multiojectide optimization are presented. The methods are using different type of membership functions and using the same kind membership function adjusting the parameter. Some corresponding analysis and examples are discussed and the results show that the two methods are very effective. 相似文献