查询词典 variable density system

The results indicate that back electromotive force increases with increasing current density and decreases by 0.5 V after adding 2% Li2CO3, the feeding period is 15 min measured by the method of electric potential control. Finally, the Al-Li alloy with the lithium content of 7.93% can be obtained by electrolyzing for 3 h at the current density of 0.62 A/cm^2 and at 680 ℃, and the current efficiency can reach 74.1%.

结果表明，反电动势随电流密度增加而增大，加入2%的Li2CO3可使反电动势降低0.5V；通过控制电位法测得加料周期为15 min：在680℃、电流密度为0.62A/平方公分的条件下持续电解3h，最终制得了理含量高达7.93%的铝锉合金，电流效率可达74.1%。

Aiming at the problems existed in the traditional experimental study and analytic methods in theory while the study was underway by the high density baler directly in laboratory, computer analysis and simulation on compressing hay in high density baler are accomplished according to the technology idea in modem design theory. The virtual prototype technology is introduced in the research.

针对在试验室条件下直接利用高密度压捆机对牧草高密度压缩过程进行研究时，传统的试验研究和理论分析方法存在的问题，本文根据现代设计理论中提出的技术思想，对牧草的高密度压捆过程进行了计算机分析与仿真研究。

ADAMS is used as an instrument to analyze the process of compressing hay in high density baler. A ADAMS model of the compressing hay in high density baler is established, and the modeling method and model structure are validated by ADAMS.

在研究中，引入了虚拟样机技术，使用ADAMS软件对牧草的高密度压捆过程进行分析，建立压缩过程中牧草的ADAMS模型，并对ADAMS的建模方式、模型结构进行了验证。

The relation of the change that the stiffness coefficient of simulation spring makes in process of the high density compressing is obtained by analysis, then the optimization analysis is achieved pointing to the compressing hay in high density baler.

通过分析获得模拟弹簧的刚性系数k随时间的变化规律，进而对牧草压缩工况进行优化分析。

The spatiotemporal spectral line intensities of the first three atomic lines in Hydrogen Balmer series (λ=656. 28, 486. 13, 434. 05nm) of RF ion source plasma, are measured with calibrated Optical Multichannel Analyzer . Some plasma parameters, including electron temperature, hydrogen atom density and hydrogen ion density, are calculated and analyzed Using Partial Local Thermodynamic Equilibrium theory and Abel transform.

实验采用绝对定标后的光学多道分析系统测定了离子源等离子体不同时间和空间位置的氢原子巴耳末谱线系中前三条谱线（λ=656.28，486.13，434.05nm）的强度，并采用PLTE的理论和Abel变换方法，计算出了高频离子源等离子体的电子温度、氢原子浓度、氢离子浓度等参数在放电的不同阶段和径向分布情况，并进行了简要分析。

According to Biot-Savart law, the magnetic induction at the diameter position of the spin axis is calculated. Furthermore, using the internal and external radius of the Earth's outer core as well as the radius of the Earth and the magnetic induction at the Earth's magnetic pole, the volume charge density and surface charge density of the Earth's outer core have been obtained.

先根据毕奥-萨伐尔定律计算球形模型绕自转轴旋转时在自转轴直径上产生的磁感应强度；再利用已知的地球外核的内外半径及地球半径和磁极处的磁感应强度值，计算出地球外核的电荷体密度及面密度。

Using the formula about the magnetic flux density induced by coil which deduced by Biot-Savart law,this paper deduces the formula about random point's magnetic flux density of hollow column solenoid and deduces the formulas about axial specific magnetic force and radial specific magnetic force by using the field gradient expression of binary function and the expression of specific magnetic force .

利用二元函数的梯度公式及比磁力公式可以得到磁性颗粒在厚壁圆环线圈所产生的磁场任意点的比磁力的轴向分量和径向分量。

The electronic and optical properties of blende phase ZnS systems doped with 3d transition metal ions were studied by the first-principles method based on density functional theory. The density of state, band structure, and absorption coefficient were calculated.

采用基于密度泛函理论的第一性原理方法对掺杂不同3d过渡金属元素的闪锌矿型ZnS系统进行了研究。

Band structure, density of states, and optical properties of Zinc blende CdTe have been investigated using the plane-wave ultrasoft pseudopotential technique based on density functional theory.

采用基于密度泛函理论框架下广义梯度近似平面波超软赝势法，计算了闪锌矿型CdTe的能带结构、态密度和光学性质。

The 1s electron cloud in hydrogen atom has the largest probability density distribution around a spherical shell with Bohr radius a 0. The author thinks the probability density distribution and electron cloud belong in fact,to statistic regularity, and imply a macro-time scale is used, therefore in hydrogen molecule the product of energy and time is far larger than Planck Constant.

氢原子中 1s电子的电子云呈球形，电子的最大几率密度分布出现在玻尔半径a0 的球壳内，认为几率密度分布及电子云属统计规律，意味着已经使用了宏观时标，这样就使氢分子体系中能量和时间的作用量远大于普郎克常数；根据电子云的交叠，用经典力学计算了基态氢分子的结构常数，获得键长、键能及力常数的表达式分别为Re=2a0 ，De=ze/4 2a0 ，k=ze/2 2a30 ，采用原子单位 a 。u 。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。