查询词典 diffusion constant

The measuring mechanism of diffusion nephelometer and methods for its improvement were studied,the result of which shows that the diffusion nephelometer using a new-type monochromatic electronic light source and provided with a luminous intensity stabilizing circuit is featured by high accuracy and sensitivity in case of narrow range of NTU,with good linearity up to 100 NTU,without frequent adjustment of zero point an

探讨散射式浊度仪的测试机理和改进方法。测试结果表明，采用新型单色电子光源和配备发光强度稳定电路的散射式浊度仪具有低浊度范围准确性和灵敏度高，至100NTU线性好，不须经常调整零点和重新标定，耗电量少，光源寿命长和抗色度干扰能力强等特点，适用于水厂提高滤池效果和监测出水水质。

According to the point "some assumptions about steady state diffusion are valid when non steady state diffusion is studied"and carbon conservation law,the carbon contents' leaping condition is given.

按照"在研究非稳态扩散问题时，稳态扩散研究中的有些假定仍然是有效的"的观点，利用碳的守恒定律给出碳浓度的跳跃条件，结合扩散通量条件，推导结果发现这种内边界条件无法解决F／A界面上的迁移。

The system at higher temperature becomes thermodynamically more stable, and raises the diffusion exchange rate of solvent and nonsolvent at the interface according to the diffusion kinetics. For the PANCMA/DMSO/ system, with the addition of DMSO to nonsolvent, the cloud point curves shifts to the polymer-nonsolvent axis, and the homogeneous phase region is broadened, system becomes thermodynamically more stable and needs more nonsolvent mixture to induce liquid-liquid phase separation.

通过浊点滴定，结合LCP半经验关系，可以得到制膜体系PANCMA/溶剂/非溶剂的三元相图浊点线，考察其相分离过程中的热力学性质，同时考察了溶剂和非溶剂双向扩散传质动力学，从体系热力学和动力学性质出发为PANCMA中空纤维膜的制备以及解释最终的膜结构和性能提供理论依据。

Objective To determine the relationship between the extent of the damage and clinical data in schizophrenia by using diffusion tensor imaging. Methods Twenty-two patients with schizophrenia and twenty normal controls received diffusion tensor scanning.

目的 应用磁共振扩散张最成像技术对精神分裂症患者额叶及胼胝体压部脑白质损伤情况与临床症状之间的关系进行初步研究。

Collecting patients which have typical clinical symptoms and have make a MRI check within 3 days, analysis the DWI image of 38 cases patients with cerebral hemorrhage, and make a relevant compare about the diffusion coefficient numerical of ADC at the same time,and it's performance almost the same with in DWI image;Also a relevant measuring and analysis have been done for the apparent diffusion coefficient numerical of edema inner or surrounding the lesions in ADC image.

收集临床症典型的三天以内进行MRI检查的患者，对经过DWI检查的38例脑出血患者的DWI图进行分析，同时进行ADC图扩散系数值的相关比较，影像表现与DWI图像表现大致相当，并对ADC图像上病灶中央和外周水肿区的表观扩散系数值做了相应测量分析。

This dissertation firstly analyses the background of this project, then analyses the research status of the AIP submarine, the gas leakage diffusion models, the numerical value solution of the diffusion equation, and the simulation research progress.

本文首先分析了本课题提出的背景，接着分析了目前国内外关于AIP潜艇的研究现状、气体泄漏扩散模型、扩散方程的数值解法、仿真研究进展，在此分析基础之上确定了本文的研究内容。

The diffusion direction and volume of gas is decided by its own partial pressure difference、diffusion rate and the solubility in fluid.

各气体的扩散方向和量，决定于该气体的分压差、气体的扩散速度和气体在液体中的溶解度。

Drugs may cross a biologic barrier by passive diffusion, facilitated passive diffusion, active transport, or pinocytosis.

药物可通过被动扩散、易化被动扩散、主动转运或胞饮作用等方式穿越生物屏障。

Drugs may cro a biologic barrier by pa ive diffusion, facilitated pa ive diffusion, active tra ort, or pinocytosis.

药物可通过被动扩散、易化被动扩散、主动转运或胞饮作用等方式穿越生物屏障。

The SCVFV(the convection-diffusion difference scheme based on control-volume face values) scheme was put forward. The theory of the SCVFV scheme was systematically elaborated. The general interpolation formula of the SCVFV scheme was given. The formulas of the SCVFV scheme based on the Cartesian coordinate were derived. The precision, the mass conservation property and the preventability of the false-diffusion of the SCVFV scheme were theoretically analyzed.

提出了基于控制容积面值的对流扩散差分格式SCVFV，系统地阐述了SCVFV格式的基本思想，给出了SCVFV插值公式的通用表达式，推导了直角坐标系下完整的SCVFV格式的表达式，从理论上分析SCVFV格式的精度、守恒性及反伪扩散性。

The changes of the HAF after liver injury may be related to the volume of blood loss, the intraabdominal pressure and the pneumoperitoneum duration.

肝撞击伤伴失血后肝动脉血流量的变化与失血量、气腹压力以及气腹持续时间等有密切联系。

Reneging on our commitments to the world's poor cannot be an austerity measure, she said.

放弃我们给世界上的穷国的承诺不能成为一种紧缩措施。