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特性坐标
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     Based on the two dimension distribution of molecular weights (M) and isoelectric points (P) of amino acids, a set of classification graph (Venn's diagram) of amino acids can be obtained.
     参考Taylor对氨基酸特性的分类图 ,本文提出以分子量 (M )及等电点 (P)作为氨基酸的化学特性坐标 ,作出其二维集合MP分类图。
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     (F、B、0) in the Study of Properties of Asynchronous Motors
     异步电动机特性研究的(f、b、0)坐标
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     The Quasi-dynamic Space Coordinate Measuring System Based On Trigonometry And Its Characteristic
     三角法的准动态空间坐标测量系统及特性
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     PROPERTIES OF BIPOLARONS
     双极化子的特性
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     Channel Characteristics;
     信道特性 ;
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     In Search of a Coordinate System for Discourse
     找寻话语的坐标
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  characteristic coordinates
The relation between characteristic coordinates and comoving ones is discussed and used to interpret a number of special solutions.
      
This behavior is analyzed by the use of matched asymptotic expansions in the plane of characteristic coordinates.
      
The description of the inviscid, compressible flow of a gas using characteristic coordinates is a classical part of the literature and will be found in such references as Courant and Friedrichs (1948) and Whitham (1974).
      


The object in view of this article is to apply 《The coordinate points function of the equidistants airway characteristics (to express by symbol E.A. C.)》in deter-mining the E. A. C. of any individual fan, when working togather with other fans in different kind of ventilation networks: The E. A. C. of a fan when treated toge-ther with The E. A. C. of any other fan, operating in combination, will be able to obtain the operating point of that fan. Because this function establishes conjunction of operations of fans,...

The object in view of this article is to apply 《The coordinate points function of the equidistants airway characteristics (to express by symbol E.A. C.)》in deter-mining the E. A. C. of any individual fan, when working togather with other fans in different kind of ventilation networks: The E. A. C. of a fan when treated toge-ther with The E. A. C. of any other fan, operating in combination, will be able to obtain the operating point of that fan. Because this function establishes conjunction of operations of fans, so that the function can help us to solve problems related to any works in combination.For illustrating the application of this method, this article aims to solve the following problems as some concrete examples.1. When three fans are working in parallel under complex or other conditions, to establish diagroms of E. A. C. for fan.2.When two fans are working in parallel, to establish Law of《How the coor dination points of E. A. C. vary with the working condition>.3.The reasonable condition which assuxe each fan in parallel working steadily,economically and will show its true individual operating-point value.4.The mothod of regulating fans when not working steadily to a steady condition.5. The method of choosing fans for working in parallel.

本文提出了利用《等值网路特性坐标点方程》来建立处于各种情况下联合工作的诸风机中任何一个风机的等值网路特性的方法.此特性和相应的风机特性的交点,即为该风机工况点.鉴于这个方程式建立了各风机工况之间的关系,从而可以利用这个方法来研究多风机联合工作的有关问题. 本文具体地研究了: 1.三台风机处于复杂的对角式通风系统中联合工作以及其他方式联合工作时,各个风机的等值网路特性; 2.两台风机并联工作时,等值网路特性随工作条件变化而变化的规律; 3.保证风机并联工作时的单值、稳定和经济工作的条件; 4.把风机从不稳定调整到稳定工作的方法; 5.选择处于并联工作的风机的方法.

According to the degree of degeneracy of genetic codes, 64 genetic codons can be subdivided into two groups, the high degenerate group (3,4,6 triplets degeneracy) and the low degenerate group (single and 2 triplets degeneracy). There are 9 amino acids which belong to the high degenerate group (G, A, S, P, V, T, L, I, R) and 11 amino acids to the low degenerate group (C, N, D, Q, K, E, M, H, F, Y, W). Amino acids of the high degenerate group have relatively simple molecular structure, rather small molecular weights...

According to the degree of degeneracy of genetic codes, 64 genetic codons can be subdivided into two groups, the high degenerate group (3,4,6 triplets degeneracy) and the low degenerate group (single and 2 triplets degeneracy). There are 9 amino acids which belong to the high degenerate group (G, A, S, P, V, T, L, I, R) and 11 amino acids to the low degenerate group (C, N, D, Q, K, E, M, H, F, Y, W). Amino acids of the high degenerate group have relatively simple molecular structure, rather small molecular weights and comparatively concentrated distribution of isoelectric points. While in the low degenerate group, molecular structure is more complex, with relatively large molecular weights, and the distribution of their isoelectric points is more dispersed. Based on the two dimension distribution of molecular weights (M) and isoelectric points (P) of amino acids, a set of classification graph (Venn's diagram) of amino acids can be obtained. The MP classification graph can demonstrate many chemical properties of amino acids, such as: size of molecular weights, degree of degeneracy, polar or non-polar, charged or non-charged, hydrophobic or hydrophilic, and the functional groups of the residues. It is suggested that the amino acids of high degenerate group are mostly small and simple, and constitute the transmembranic structure or the structural domains of protein molecules. So, amino acids of high degenerate group might appear in the early evolution stage. On the other hand, the amino acids of low degenerate group are rather large and complex, and ultimately correlate to the functional domains of protein molecules, then, the amino acids of low degenerate group might appear more lately during evolution.

根据氨基酸遗传密码子的简并程度 ,可将64个遗传密码子分为高简并度类 (3 ,4 ,6度简并组 )和低简并度类 (1 ,2度简并组 )两大类[1]。高简并度类有9个氨基酸 ,其分子量比较小 ,等电点的分布比较集中。低简并度类有11个氨基酸 ,其分子结构比较复杂。参考Taylor对氨基酸特性的分类图 ,本文提出以分子量 (M )及等电点 (P)作为氨基酸的化学特性坐标 ,作出其二维集合MP分类图。MP分类图可以反映出氨基酸的各种属性 ,如分子量的大小 ,简并度的高低 ,极性与非极性 ,带电荷或不带电荷 ,疏水性与亲水性 ,以及氨基酸残基的种类等。根据氨基酸的分类分析 ,可以认为 :高简并度氨基酸多数是脂烃类和羟脂烃类的氨基酸 ,分子量比较小 ,分子结构比较简单 ,大部分为疏水性 ,主要组成跨膜结构或蛋白质的结构域 ,可能是出现较早的氨基酸 ;而低简并度的氨基酸 ,分子结构比较复杂 ,分子量比较大 ,多数是和蛋白质功能有密切联系的基团 ,可能是进化出现较晚的结构。

 
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