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塌缩
相关语句
  collapse
    COLLAPSE TRANSITION OF A MODEL POLYMER CHAIN TERMINALLY ATTACHED TO A SURFACE
    端基附壁高分子模型链的塌缩转变
短句来源
    ADSORPTION AND COLLAPSE OF A POLYMER CHAIN MODELED BY A SELF-AVOIDING WALK ON THE CUBIC LATTICE
    简立方格点自避行走所模拟的高分子链吸附和塌缩
短句来源
    They are AE (adsorbed-expanded), DE (desorbed-expanded), AC (adsorbed-collapsed) and DC (desorbed-collapsed). It was found that both adsorption and collapse transitions were existed.
    相图表明,存在四个相,分别是AE,DE,AC和DC,并且吸附相变和塌缩相变同时存在。
短句来源
    the dynamical localization happens at the quasi-energy band collapse points.
    在纯交流(ω_B=0)下,动力学局域化发生在准能带塌缩点。
短句来源
    When both the ratios are rational or irrational numbers, the dynamical localization happens at the quasi-energy band collapse points.
    当两个比率都是有理数或无理数时,动力学局域化发生在准能带塌缩点。
短句来源
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  “塌缩”译为未确定词的双语例句
    We started with the folding or coil-to-globule transition of linear poly(N-isopropylacrylamide) (PNIPAM) homopolymer chains in water, and then studied the folding of hydrophilically or hydrophobically modified PNIPAM copolymer chains.
    最初,作者研究了聚(N-异丙基丙烯酰胺)(PNIPAM)均聚物的折叠或叫做“线团-塌缩球的转变”,然后研究了含有疏水和亲水基团的PNIPAM共聚物的折叠。
短句来源
    THE MONTE CARLO SIMULATION OF THE COLLAPSE TRANSITION OF A SEMI-STIFF POLYMER CHAIN
    半刚性高分子链塌缩相变的蒙特卡洛模拟
短句来源
    According to Floquet theorem, the relations between the dynamical localization and quasi-energy bands are pointed out with both numerical and analytical calculations on quasi-energy bands and their corresponding time evolution.
    应用Floquet定理,从解析与数值计算两个角度计算了该模型的准能谱与时间演化,指出动力学局域化与准能谱的塌缩的对应关系。
短句来源
    The results show that they depend sensitively on the frequency ratios, wB/w1 and w2/w1 where wb is the Bloch frequency, w1 and w2 are the external electric field frequencies. For the case in a bichromatic ac field (wb = 0).
    在准能带塌缩处,动力学局域化发生。 我们发现准能谱和动力学局域化敏感地依赖频率比率(ω_B/ω_1和ω_2/ω_1,这里ω_B=edE_0是Bloch频率)。
短句来源
    The configurations and the collapsed polymer state of a semi-stiff chain under various temperatures, especially below the theta point ,are presented in this paper.
    本文主要研究半刚性高分子链在不同温度下的形态变化,特别是在低温下的塌缩相变。
短句来源
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  collapse
Gravitation collapse of spherical symmetry with non-uniform density
      
A star with sufficiently large mass will collapse in its senectitude because of gravitation.
      
Many researchers have tried to describe this collapse process.
      
When the density function is high in the center and decreasing with the radius, the collapse process will be described, and in this case, the singularity will only come out in the center because of collision.
      
This paper attempted to numerically analyze the action process based on damage mechanics when a jet created by bubble collapse acted on the bearing surface in the process of cavitation erosion.
      
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The configurations and the collapsed polymer state of a semi-stiff chain under various temperatures, especially below the theta point ,are presented in this paper. The Monte Carlo method is used to simulation the behavior of a semi-stiff polymer chain in simple cubic lattice. In our model the inter-segmental interactions included the hard core volume effect, longer ranged attractive part and the local stiffness potential. The stiffness of a chain is determined by the ratio of stiffness potential and attractive...

The configurations and the collapsed polymer state of a semi-stiff chain under various temperatures, especially below the theta point ,are presented in this paper. The Monte Carlo method is used to simulation the behavior of a semi-stiff polymer chain in simple cubic lattice. In our model the inter-segmental interactions included the hard core volume effect, longer ranged attractive part and the local stiffness potential. The stiffness of a chain is determined by the ratio of stiffness potential and attractive effect. Our results have been obtained showing a shrinkage of the coil dimension of a polymer chain with decrease temperature. But there has some differences between a flexible chain and a semi-stiff polymer chain. At first the soil demintion of a semi-stiff chain is expanded due stiffness potential, then it shrinkage with decrease temperature. From the behaviou of the specific heat we concluded that the collapsed transitions of a polymer chain is a second-order phase transitions.

本文主要研究半刚性高分子链在不同温度下的形态变化,特别是在低温下的塌缩相变。我们对半刚性高分子链在三维简立方点阵上进行蒙特卡洛数值模拟。计算模型中考虑了链段间的排斥势、近邻间的吸引势和局域刚性势。链的刚性程度由刚性势与吸引势的比值确定。计算证明在温度逐步下降时,柔性链的形态由高温下的无规线团逐渐收缩为低温下的无规紧缩线团;但刚性程度较高的链则首先扩展,然后再收缩为具有一定有序度的紧缩态。同时我们也证明半刚性高分子链的塌缩相变是与柔性链的形态转变相同,它们的热力学行为都符合二级相变的特征。

Molecular dynamics

利用分子模拟方法研究了不同链长聚乙烯单链折叠过程和相关的松弛和坍塌机理.发现在链长短于1000CH2单元时,聚乙烯的链段主要通过整体塌缩机理进行折叠和取向;而链长超过1000CH2单元时,可以明显地观察到局部取向团簇的形成,聚乙烯单链通过局部塌缩机理进行折叠和取向.通过对各阶段团簇数目,体系取向链段长度的表征,说明体系在模拟时间范围内表现了很强的松驰特性.

The conformational variation of a polymer chain terminally attached to a surface at different temperatures was studied by using Monte Carlo and simulated annealing methods.The model polymer chain was a self\|avoiding walk with non\|bonded nearest\|neighbor interactions on a simple cubic lattice.It was shown in results of computer simulations that in dilute solutions the tail chain,like the free chain,undergoes the phase transition from a loose coil to a compact globule when the temperature decreases.The mean...

The conformational variation of a polymer chain terminally attached to a surface at different temperatures was studied by using Monte Carlo and simulated annealing methods.The model polymer chain was a self\|avoiding walk with non\|bonded nearest\|neighbor interactions on a simple cubic lattice.It was shown in results of computer simulations that in dilute solutions the tail chain,like the free chain,undergoes the phase transition from a loose coil to a compact globule when the temperature decreases.The mean square end\|to\|end distances and their components,as well as the mean square radius of gyration and their distributions were calculated at different temperatures.Due to the existence of the surface,the curves expressing the chain size versus temperature for the tail chain were slightly lower than those for the free chain.It was also found that the effect of the surface on the shape of the polymer chain was obvious at high temperature,and the perpendicular component of mean square end\|to\|end distance was significantly larger than the parallel component.However,below the θ temperature,especially after the full collapse of the polymer chain,the effect of the surface on the chain shape becomes very small.

借MonteCarlo和模拟退火方法研究了端基附壁高分子尾形链在不同温度下的形态变化 ,链的模型采用有最近邻相互吸引作用的自避行走 .计算机实验结果表明 ,对于端基附壁的高分子尾形链 ,与自由链一样 ,当温度逐渐降低时高分子链会发生从松散的无规线团到紧密球体的塌缩转变 .计算机模拟得到了端基附壁链的均方末端距及其分量 ,均方回转半径及分布随温度的变化 .由于刚性壁的影响 ,使得有限链长的高分子尾形链与自由链相比 ,其表示链尺寸 温度关系的曲线要稍低 .模拟还发现 ,在高温时壁对链形状的影响比较大 ,壁垂直方向上尺寸明显大于平行方向的尺寸 ,后者接近于自由链的尺寸分量 .然而 ,低于θ温度时 ,尤其是完全塌缩之后 ,壁对链形状的影响已经很小 .

 
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