The current test method of heavy metals in edible alcohol is adopted colorimetric method using hydrogen sulphide saturated solution as colorific agent , this method is toxic , disagreeable odour , contaminated , overlaborated and time expended 摘要食用酒精重金属检验方法目前是采用饱和硫化氢溶液作显色剂的比色测定法,该法毒性大、气味难闻、污染严重、繁琐、耗时。
Compared with octree data structure , the omni - tree data structure could reduce the meshes " total numbers and get better mesh quality . this paper uses cell - centered finite volume spatial discretization and four - stage runge - kutta time - stepping scheme with some convergence acceleration techniques such as local time stepping and enthalpy damping 在流场计算中,本文采用格心格式的有限体积法用二阶中心差分对欧拉方程作空间离散,用四步龙格库塔方法作显式时间推进。
In this paper , the upwind scheme and the central scheme are presented for solving 3 - d n - s equations using the cell - center finite volume spatial discretization and four - stage runge - kutta time stepping scheme , with standard convergence acceleration techniques such as local time stepping and implicit residual smoothing 在n - s方程的数值计算上,采用了中心差分格式和迎风格式,用格心格式的有限体积法进行了空间离散,用四步龙格?库塔法作显式时间推进,并采用了当地时间步长和隐式残差光顺等加速收敛措施。
作: rise; get up; stand up显: apparent; obvious; noticeabl ...动作显露: acting in工作显影浴: working bath仅作显示属性: display only attribute时间动作显示: time motion di lay; time motion display校正动作显示: corrective action display脱线操作显微镜光度计: microscope photometer for off-line operation繁重的工作显然使她有些力不胜任: it was evident that her physical strength could not support her strenuous task用作显示直方图和累计分别函数的绘图窗口。: histogram window作现金出纳: keep the cash作先锋: herald作线环的装置: looper作戏的人: the actor作线环者: looper作戏: burlesque作线民: nark作系统文件丢失: missing operating system作线性规划: linear planning作系统分析: analysis of unix system