查询词典 constant current

Molecular dynamics simulations of NPT (constant pressure and constant temperature) dynamics are carried out to obtain specific volume as a function of temperature for polyethylene , polypropylene , poly-isobutylene , polyoxymethylene , and polydimethylsiloxane .

用NPT分子动力学模拟来获得聚乙烯、聚丙烯、聚异丁烯、聚甲醛和聚二甲基硅氧烷在不同温度下的特征体积。体积玻璃化转变温度通过对模拟得到的V-T作图的曲线的拐点决定。

The logical system Qs is obtained from the pure predicate calculus by adding a binary predicate constant S which denotes the sanctions, an individual constant c denoting the state institutions, and some definitions of deontic modal words but not adding axioms or deducible means.

它以狭义谓词演算为基础，在其形式语言中添加专指"制裁"行为的谓词常项，添加专指"国家机关"这种法人的个体常项，添加规范词的定义，但不添加推演工具，就可次生出关于法律规范的逻辑。

The main achievements could be summarized as follows.1. The basic stress-strain characteristics and related physical mechanisms for sands under cyclic rotation of principal stress axes were investigated based on three kinds of drained tests including fixed principal stress axes, cyclic rotation of principal stress axes with magnitudes of principal stresses kept constant, and cyclic changes of principal stresses in both their axes and magnitudes. The main deformation behavior of sands with inherent anisotropy under cyclic rotation of principal stress axes with magnitudes of principal stresses kept constant was obtained in the following.

本文从试验研究、规律分析、数学建模和工程应用四个方面，对应力主轴循环旋转条件下砂土的变形特性进行了较为深入的研究，取得了如下主要研究成果：(1)基于对饱和砂土进行的主轴固定单调剪切、纯应力主轴循环旋转以及主应力幅值与应力主轴耦合循环变化的三类完全排水试验成果，分析和揭示了应力主轴循环旋转条件下砂土的基本变形规律，并探讨了其受力变形的内在机理。

Then, based on the mean curvature, Gaussian curvature and the function of principal curvature, the minimal loci of the principal normal surfaces of curves, the curves with constant Gaussian curvature and the two curves of which the ratio of their functions is constant can all be obtained, as well as the properties of geodesic curve and lumbar curve.

再根据平均曲率、高斯曲率及主曲率函数，能得到曲线的主法线曲面的极小轨迹、常高斯曲率曲线及两个主曲率函数之比为常数的曲线。还给出曲面上测地线和腰曲线的性质。

Estimate the force constant k of a Z-H bond, assuming that there is a linear proportionality between force constant and bond enthalpy.

键的键合常数，焓的线性比例关系。从这些信息中推测 Z 的原子量。并给出 Z 的元素符号。

The proportionality constant, H, is known as the Hubble constant and quantifies how fast space is stretching—not just around us but around any observer in the universe .

其中的比例常数H，就是所谓的哈伯常数，它可以把空间向外延伸的快慢予以量化，不只针对我们周遭，也适用于宇宙中所有观测者的周围。

All nature, from the smallest thing to the biggest, from a grain of sand to the sun, from the protista to man, is in a constant state of coming into being and going out of being, in a constant flux, in a ceaseless sate of movement and change.

自然中所有事物，从最小到最大，最一粒沙到太阳，从原生物到人，是处在一个不断生成和消亡状态中，不断变迁，永远不停的运动和变化中。

Rna - Rns, see "Partitioning of net radiation", for multiple plants the fraction of radiation to each plant is calculated in the radiation section, see "Partitioning of radiation between plants", es is the vapour pressure at saturation, ea is the actual vapour pressure,ρa is air density, cp is the specific heat of air at constant pressure, Lν is the latent heat of vaporisation,Δ is the slope of saturated vapour pressure versus temperature curve,γ is the psychrometer "constant", rs is an "effective" surface resistance and ra is the aerodynamic resistance.

潜在蒸腾量 Etp 根据Monteith(1965)给出的彭曼联合方程形式计算：式中： Rn 为对于蒸腾的有效净辐射量(也就是 Rna - Rns ，见"净辐射划分"-Partitioning of net radiation，对于多重植被，每一株植物的辐射比率的计算见辐射一节的"植物间的辐射划分"Partitioning of radiation between plants)； es 为饱和水气压；ea 为实际水气压；ρa 为空气密度； cp 为常压下的空气比热；Lν为汽化潜热；Δ为与温度曲线饱和水气压关系曲线斜率；γ为干湿球湿度计"常数"；rs 为"有效"表面阻力；ra 为气动阻力。

Pyrometallurgy and hydrometallurgy are introduced in this article,pyrometallurgy,ammoniacal leaching and high-pressured acid leaching has obvious disadvantage.Craft simply,energy consumption low,the operation easy to control,investment low are the merits of the constant-pressured acid leaching.It is belived that constant-pressured acid leaching w...

本文介绍的红土镍矿处理工艺有火法工艺和湿法工艺，其中火法工艺和湿法工艺中的氨浸法、高压酸浸法存在明显缺点，而常压酸浸法有工艺简单、能耗低、操作易于控制、投资少等优点，将会有很好的发展前景。

Capillary Electrophoresis as a Method for Determining Hydrolysis Rate Constant of Raffinose Capillary electrophoresis was first employed for the determination of hydrolysis rate constant of trisaccharide raffinose.

测定棉子糖水解速率常数的毛细管电泳方法毛细管电泳首次用于测定三糖的水解速率常数。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了