排序方式: 共有6条查询结果,搜索用时 0 毫秒
1
1.
2.
根据福生水电站冲沙闸佛氏数低消能效果差的特点,采用物理横型试验方法对冲沙闸的泄流能力、水面线、流态、消能效果及对下游河道冲刷影响进行了试验研究,提出了优化后的消耗建筑物型式和结构尺寸,为设计提供了依据. 相似文献
3.
杨效潍 《南京林业大学学报(自然科学版)》1988,31(1):78
<正>应用结构矩阵分析进行结构计算,早几年已在大中型计算机上实现,但由于大中型计算机价格昂贵,设备和管理条件的要求较高,使得计算机分析的应用受到很大限制。全国设计单位除少数大型工程结构应用电算分析,大多数的中小型结构,仍然采用手算。随着微型计算机的普及,采用较简单的BASIC语言编程的结构分析方法,对缩短设计时间和推广微机在结构计算中的应用,有其积极作用。 相似文献
4.
The phase behaviour of the middle-phase microemulsion for the quaternary system lauric-N-methylglucamide (MEGA-12)/n-butanollalkane/water has been studied with Winsor type, δ-γ, fishlike and novel ε-β fishlike phase diagrams. A series of phase inversions Winsor I (2)→Ⅲ(3)→Ⅱ ( 2 ) were observed for the three kinds of phase diagrams. The phase types, the phase volumes and the range of alcohol concentrations from the beginning to the end of the middle-phase microemulsion were obtained from Winsor phase diagram. From δ-γ, fishlike phase diagram, the physicochemical parameters, such as the mass fraction of n-butanol in the hydrophile-lipophile balanced inteffacial layer, A^s, the coordinates of the start and end points of the middle-phase microemulsion, and the solubilities of MEGA-12 and n-butanol in alkane phase were calculated. The novel ε-β fishlike phase diagram was also presented. From this kind of diagram, the above experimental phenomena were observed and the physicochemical parameters were calculated precisely. The novel fishlike phase diagram has advantages over the Winsor and δ-γ fishlike phase diagrams in the evaluation of the solubilization power of the microemulsion and calculation of the related physicochemical parameters. 相似文献
5.
6.
近年来,检测活体或离体的人淋巴细胞SCE频率与染色体畸变,已成为评价化学物质与环境污染物诱变性的快速、灵敏方法。并在环境保护与卫生工作中得到了广泛重视和应用辽河系辽宁省受严重工业污染的河流之一,下辽河系指辽河下游位于营口地区境内的区段,两岸有70万人口直接或间接饮用下辽河水。作者曾在《下辽河污染水的遗传毒性研究Ⅱ:体外诱导人淋巴细胞的SCE频率》一文中,报告了下辽河污染水从0.01剂量组起,对离体的人淋巴细胞诱导的SCE频率明显高于对照组,而且SCE频率随剂量浓度的升高而递增,两者之间呈显著性差异。又据作者对20万人口全死因流行病学调查,饮用下辽河污 相似文献
1