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|  | | 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。 | |
Downward change in flow velocity fits semi-log law, showing an exponential decreasing flow current with the maximum flow velocity near the water surface.
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The properties of films formed on the water surface by rigid molecules of organosilicon compounds, oligomeric silsesquioxanes containing phenyl and ethyl side groups, are studied.
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Surface Dynamic Elasticity of Poly(ethylene oxide) Monolayers on a Water Surface
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The value of water surface potential calculated on the basis of the method of volta-potential difference was compared with the similar values collected by other methods.
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The data obtained make it possible to conclude that the value of the water surface potential is equal to +0.10 V that, at present, seems to be the most reasonable and correct value.
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In the case of 4-dimensional anticommutative algebras a construction is given that links the associated cubic surface and the 27 lines on it with the structure of subalgebras of the algebra.
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For a smooth oriented surface Σ, denote byM(Σ) the set of all ways to represent Σ as a result of gluing together standard spheres with holes ("the Lego game").
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Our proof uses the connection between this variety and the punctual Hilbert scheme of a smooth algebraic surface.
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Assuming that the surface contains two elliptic fibrations that are invariant by non-periodic automorphisms, we give the classification of invariant probability measures.
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The mapping class group of a compact oriented surface of genus greater than
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| | ~~ | | 在缺乏直接观测流量资料地区小汇水面积雨洪最大流量的计算方法和公式目前不下有数百种,因而在实用中对各类方法的应用与选择常感不好确定标准。但如就各公式的性质来看可以分为纯经验方法与推理公式方法雨大类,其中后者的解决则取决于以下三个关键性的问题,即(1)暴雨公式的类型(2)计算损失的方法和(3)计算集流时间的方法,根据这三个关键问题的具体解决方法不同,推理公式又可再分为几类。本文即就这些分类结合实用中及文献中常见的计算方法,综合比较其在理论上及实用中的优缺点,并特别对目前国内外在水文计算实践中常用的,即作为苏联铁道部1952年以前计算规范的柏罗托吉亚可诺夫方法(柏氏法),波尔达可夫和切戈达也夫的方法即苏联铁道部1952年、苏联公路运输部1955年小汇水面积雨洪计算规范,以及阿列克谢也夫方法等加以较详细的分析,和这些方法在我国自然条件下应用的限制等加以说明,并提出在进一步研究小汇水面积雨洪最大流量问题的意见。 | | 文摘来源 | | ~~ | | 水库水位降落时,士坝上游坝壳中自由水面线位置变化的确定,对于校核迎水坡的稳定性具有重要的意义.我们对此问题进行了理论计算及模型试验.研究中考虑了坝壳断面形式(上游坡、坝壳顶宽、心墙坡)填上渗透性及水库水位降落速度等因素对自由水面位置变化的影响。对不透水坝基情况提出了近似的理论计算公式,对有限深度透水坝基及不透水坝基分别提供了一套试验曲线;两者均可供设计应用. | | 文摘来源 | | On the basis of the theory of turbulent diffusion and the assumption of the isotropy of turbulence, the paper analyses the concentration distributions both of the entrained air in the lower two-dimensional high-velocity chute flow and of the entrained water in the upper coexisting air flow. While only integral forms are given for the starting stage of the entrainment, the analysis is carried out in detail for the stage of the entrainment in full development. The result thus obtained for the lower part appea... | | 文中根据在高速水流情况下,紊动为各向同性的假设,应用紊动扩散理论对二元的掺气均匀水流水中含气浓度和水面上气中含水浓度分布进行了分析。给出了极限状态亦即掺气发展为充分情况下的浓度分布无因次分析式;在气中含水部分为指数函数,而在水中含气部分为双曲余弦函数。经与已有试验资料作比较,指明水中含气浓度的分析与试验结果符合。气中含水浓度的分析虽与试验结果有差异,但实际情形为分析中出现的无因次参数的函数。对发展状态的浓度分布仅给出了积分式。全部分析连系到水流的深度、倾斜度、流速、水滴和气泡的下降和上升速度、以及紊动的特性诸因素。 | | 文摘来源 | |   | | << 更多相关文摘 |
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