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熵梯度
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     Interrelating Entropy
     相关
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     EXTENSION OF ENTROPY
     的泛化
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     Gradient of the Text
     文本的梯度
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     at a flow rate is about 1ml/min by gradient elution.
     梯度洗脱。
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     Fusion Detection of Small Infrared Target Based on Local Entropy and Local Gradient Strength
     基于局部梯度和局部的红外小目标融合检测
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  entropy gradient
However, even at large Reynolds numbers owing to the strong entropy gradient on the lateral surface it becomes necessary to take boundary layer corrections into account in the higher approximations [1].
      
A complex influence of a nonzero entropy gradient on the instability of sonic and surface gravity modes has been found.
      
Conservation of energy applied to the steady flow of water vapor through an arbitrarily selected volume element of wood shows that the vapor entropy gradient is zero.
      
Because the entropy production due to moisture flow must be balanced by a corresponding entropy flow away from the element, entropy gradients for bound water and water vapor are equal and the bound water entropy gradient also is zero.
      
Cells maintain a steep transmembrane entropy gradient by continuous application of information that permits cellular components to carry out highly specific tasks that import energy and export entropy.
      
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The equations,of motion on S2 stream-surface are presented with the flow angle β as a characteristic parameter. The solution of these equations within the blade channels is simplified by expressing the blade force F in terms of the geometric parameters of the stream-surface.Emphasis is laid upon the discussion of the loss-distribution along the blade length and the calculation of the average flow conditions and entrppy gradient behind the stage.Two calculated examples are given. One of them shows the effects...

The equations,of motion on S2 stream-surface are presented with the flow angle β as a characteristic parameter. The solution of these equations within the blade channels is simplified by expressing the blade force F in terms of the geometric parameters of the stream-surface.Emphasis is laid upon the discussion of the loss-distribution along the blade length and the calculation of the average flow conditions and entrppy gradient behind the stage.Two calculated examples are given. One of them shows the effects of the entropy and enthalpy accumulation in multistage turbines. The other compares the solutions of the equations within the blade channels and in the axial gap between two blade rows.

给出了以气流角β为特征参数的S_z流面上的运动方程,其中叶片力F用S_2流面的几何参数表示,使叶列内的求解得到简化.着重讨论了沿叶高的损失分布,级后的平均参数,熵的梯度的计算.以两个算例分别说明了多级透平中熵和焓积累的影响,以及叶列间隙中的计算和叶列内计算的比较.

A three-dimensional flow field calculation of the centrifugal compressor and thecentripetal turbine in the small gasturbine installation of a 50-hp.fire pump producedby Shanghai Chiao Tung University was carried out in accordance with a generalprogram,which employs the arbitrary quasiorthogonal surface approach.The criteria for the judgement of the flow field of the impeller are mentioned.According to the calculation results,the aerodynamic performance of the compressorimpeller should be improved.Some measures...

A three-dimensional flow field calculation of the centrifugal compressor and thecentripetal turbine in the small gasturbine installation of a 50-hp.fire pump producedby Shanghai Chiao Tung University was carried out in accordance with a generalprogram,which employs the arbitrary quasiorthogonal surface approach.The criteria for the judgement of the flow field of the impeller are mentioned.According to the calculation results,the aerodynamic performance of the compressorimpeller should be improved.Some measures for improving the compressor impellerhave thus been suggested.The calculation results of the centripetal turbine indicate that the aerodynamicdesign of the impeller is satisfactory.In addition,the variation of entropy gradient was also considered in the calcula-tion of the flow field.The calculation results agree more satistactorily with the practical conditionswhen the variation of loss from the hub to the shroud is considered.

应用准正交面方法编制了一个通用程序对上海交通大学生产的50马力消防泵用小燃气轮机装置的离心压气机及向心涡轮进行了三元流场计算。文中提出了判别叶轮流场好坏的准则。根据压气机叶轮流场的计算结果表明,其气动性能尚有待改进。提出了压气机叶轮的一些改型措施。向心涡轮的流场计算结果表明,该叶轮气动设计是良好的。另外,也进行了计及熵梯度变化时的叶轮流场计算,由于考虑了沿盘盖方向的损失变化,其计算结果看来更符合实际情况。

First, we present in § Ⅰ the ignition condition of main nuclear burning during evolution of stars with different mass, the dominant role of electron degeneracy played on the nuclear burning of stars under dense density and the condition of explosive nuclear burning respectively. Next we present the main physical factors which cause the stars to be unstable and to collapse in §Ⅱ. We review some unsolved questions of nuclear physics or solid physics in the theory of type Ia supernova explosion in § Ⅲ. We review...

First, we present in § Ⅰ the ignition condition of main nuclear burning during evolution of stars with different mass, the dominant role of electron degeneracy played on the nuclear burning of stars under dense density and the condition of explosive nuclear burning respectively. Next we present the main physical factors which cause the stars to be unstable and to collapse in §Ⅱ. We review some unsolved questions of nuclear physics or solid physics in the theory of type Ia supernova explosion in § Ⅲ. We review in §Ⅳ the serious difficulties in the theory of type Ⅱ (and type I b) explosion and we also introduce our work of the neutrino delayed explosion mechanism of SNII. We suggested that the strong neutrino flux required in the neutrino delayed explosion mechanism of SNII may be produced by a phase transition of (nuclear matter)?(u,d) quark?(u,d,s) quark during very short time scale (<1 μsec) in the collapsed core (a new born neutron-proton star). Besides, it may be also transported outwards to the surface of neutrino sphere due to the negative entropy gradient. We discuss in §Ⅴ an electric screening effect on the electron capture process in the dense core of the pre?supernova and its possible effect on mass of the collapsed core of the supernova, which plays a key role of the instantaneous explosion mechanism of supernova.

首先 ,在第 1节中我们依次介绍了各种不同质量的恒星演化进程中各个主要热核燃烧的点火条件 ,致密物质中自由电子系统的简并性对星体热核燃烧的主导作用以及爆炸性核燃烧条件。其次 ,在第 2节中我们讨论了导致恒星核心不稳定坍缩的物理因素和条件。此后 ,在本文第 3节中我们评述了Ⅰa 型超新星爆发理论尚在争论中的核物理和固体物理的问题。在第 4节中我们评述了Ⅱ型 (以及Ib 型 )超新星爆发理论中的严重困难 ,并且介绍了我们 (南京大学研究小组 )就超新星中微子延缓爆发机制的关键问题 (强大的中微子暴如何产生 ?)的物理机制提出的具体过程 :这中微子暴的强大中微子流量是从刚刚坍缩的高温高密核心通过核物质——— (u ,d)夸克系统——— (u ,d ,s)系统的相变过程在不到 1微秒的时间内很快地产生出来的的。而且 ,这个过程导致核心区域的负熵梯度 ,引起核心区域大规模对流 ,它将这强大的中微子流量很快地向外输送到中微子球的表面。在第 5节中本文还介绍了我们就超新星核心高密条件下电荷屏蔽对电子俘获过程的影响所作的探讨研究以及讨论了它对超新星坍缩核心质量 (它对超新星瞬时爆发机制成功与否起着关键作用 )的可...

首先 ,在第 1节中我们依次介绍了各种不同质量的恒星演化进程中各个主要热核燃烧的点火条件 ,致密物质中自由电子系统的简并性对星体热核燃烧的主导作用以及爆炸性核燃烧条件。其次 ,在第 2节中我们讨论了导致恒星核心不稳定坍缩的物理因素和条件。此后 ,在本文第 3节中我们评述了Ⅰa 型超新星爆发理论尚在争论中的核物理和固体物理的问题。在第 4节中我们评述了Ⅱ型 (以及Ib 型 )超新星爆发理论中的严重困难 ,并且介绍了我们 (南京大学研究小组 )就超新星中微子延缓爆发机制的关键问题 (强大的中微子暴如何产生 ?)的物理机制提出的具体过程 :这中微子暴的强大中微子流量是从刚刚坍缩的高温高密核心通过核物质——— (u ,d)夸克系统——— (u ,d ,s)系统的相变过程在不到 1微秒的时间内很快地产生出来的的。而且 ,这个过程导致核心区域的负熵梯度 ,引起核心区域大规模对流 ,它将这强大的中微子流量很快地向外输送到中微子球的表面。在第 5节中本文还介绍了我们就超新星核心高密条件下电荷屏蔽对电子俘获过程的影响所作的探讨研究以及讨论了它对超新星坍缩核心质量 (它对超新星瞬时爆发机制成功与否起着关键作用 )的可能影响。

 
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