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Based on the equation of state, the other thermodynamic properties such as the enthalpy, entropy and heat capacity at constant pressure are estimated by the residual function method and the fugacity coefficient method respectively.


In the twodimensional case a detailed study is made of the case when a constant pressure p0, moving with the constant velocity U, is given on a segment of length 2l.


The solution is found for the equations of a motion containing a shock wave which propagates through a quiescent gas with variable initial density and constant pressure.


The results of Raizer [1], Hays [2], and Chernous'ko [3] are generalized tothe case of selfsimilar propagation of shock waves in a gas with exponentially varying density and constant pressure.


The radius of the sphere varies under the action of a constant pressure at infinity.

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 Anionic monofunctional polymerization and difunctional Polymerization of HFPO with perfluorinated acyl fluoride in presence of potassium fluoride have been studied. We found that under ordinary pressure the activity of monofunctional polymerization of HPPO in presence of potassium fluoride is much smaller than that in presence of cesium fluoride reported in the literature, and in the presence of potassium fluoride the activity of difunctional polymerization of HFPO is larger than that of monofunctional polymerization.... Anionic monofunctional polymerization and difunctional Polymerization of HFPO with perfluorinated acyl fluoride in presence of potassium fluoride have been studied. We found that under ordinary pressure the activity of monofunctional polymerization of HPPO in presence of potassium fluoride is much smaller than that in presence of cesium fluoride reported in the literature, and in the presence of potassium fluoride the activity of difunctional polymerization of HFPO is larger than that of monofunctional polymerization. We also found that the emulsified layer formed at the end of the polymerization shows catalytic activity, it may has the composition of K+ OCF2RtCF2OK+. It catalyses the monofunctional polymerization of HFPO during the difunctional polymerization. A mechanism is suggested to explain this catalytic phenomenon.  研究了氟化钾催化下全氟环氧丙烷的自聚以及与全氟戊(或己)二酰氟的双官能团阴离子聚合。发现在常压力下氟化钾催化全氟环氧丙烷自聚的活性比文献报道的氟化铯催化活性小得多,但氟化钾催化全氟环氧丙烷和全氟戊(或己)二酰氟的双官能团聚合活性却比催化全氟环氧丙烷自聚的活性大。产物分离时两层中间的乳化层有催化作用,其结构可能为K~+~OCF_2R_fCF_2O~K~+,它还使全氟环氧丙烷在与全氟戊(或己)二酰氟的双官能团聚合中的自聚活性提高,类似于文献关于R_fO~C_s~+是活性催化剂的报道。对此催化作用提出解释。  This paper is an investigation on the waterlotgged settlement of lo ess subsoil under the constant loading of the building.The computative formula is derived from the three units rheologic model which is comp osed of Hooke unit and Kelvin unit in series.The viscosity η in the equ ation is related both to the thickness of soil stratum H and the coefficient of permeability k after the instantaneous strain produced in above mentioned system,then η is calculated by the theory of KelvinTerzaghi relationship.... This paper is an investigation on the waterlotgged settlement of lo ess subsoil under the constant loading of the building.The computative formula is derived from the three units rheologic model which is comp osed of Hooke unit and Kelvin unit in series.The viscosity η in the equ ation is related both to the thickness of soil stratum H and the coefficient of permeability k after the instantaneous strain produced in above mentioned system,then η is calculated by the theory of KelvinTerzaghi relationship. This proposed method of computation provides a theoretical basis for compaction and consolidation of shallow soil stratum and as consequence, the damage of the upper structure could be reduced when the loess sobsoil is waterlogged.  本文研究黄土地基的湿陷特性并提出在建筑物常压力下浸水后的变形计算方法。计算公式是藉虎克元件及开尔文体串联的三单元流变模型推导得出。方程中的粘滞系数η与土层厚度2h以及上述力学模式的土样在完成瞬时应变后饱和黄土的渗透系数k值有关,然后藉太沙基——开尔文理论的相关性计算得出。本文建议的湿陷量计算方法为黄土地区房屋地基进行浅层加固或压实处理措施即能减少或消除地基湿陷对上部结构危害的方案提供了理论依据。  In this paper, the downwash integral equa.tion for the small perturbation transonic potential flow past an oscillating wing is established on the basis of local linearization concept. The method for calculating the tran/subsonic kernel function is discussed in detail. To calculate the unsteady pressure on an oscillating rectangular wing in the tran/subsonic flow, the generalizeddoubletlatticemethod is used. The results show that the locally linearized panel method is more accurate than the usual linearized... In this paper, the downwash integral equa.tion for the small perturbation transonic potential flow past an oscillating wing is established on the basis of local linearization concept. The method for calculating the tran/subsonic kernel function is discussed in detail. To calculate the unsteady pressure on an oscillating rectangular wing in the tran/subsonic flow, the generalizeddoubletlatticemethod is used. The results show that the locally linearized panel method is more accurate than the usual linearized methods. But further efforts are needed so as to obtain a numerical method available for calculating the tran/supersonic flows.  本文以小扰动位势流理论为基础,采用局部线化假设,建立了三维振动机翼的跨音速下洗积分方程;给出了跨亚音速流核函数的计算方法;用推广的偶极子栅格法计算了矩形谐振动机翼上的非定常压力分布。结果表明,本方法可以较准确地计算非线性的跨亚音速非定常流动,关于跨超音速流动的数值解法,尚需作进一步的研究。   << 更多相关文摘 
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