查询词典 vapor density

The air density correction is important for water vapor and CO2 fluxes, and should be applied.

但它的使用是有条件限制的，如果不进行必要的修正，得到的通量就可能有较大的误差。

Density Functional Theory method was used to optimize the geometries of 209 PCDE molecules, 209 PBDE molecules and 75 PCDD molecules at the B3LYP/6-31G* level. Using computed structural parameters as theoretical descriptors, the forward stepwise multiple regression technique was adopted to obtain QSPR models of environmental partition properties for these POPs by using GQSARF 2.0 and SPSS12.0 for windows programs. The obtained QSPR models are as follows:(1) QSPR models for predicting subcooled liquid vapor pressure, n-octanol/water partition coefficients lgK_(ow and subcooled liquid water solubilities -lgS_(w,l of PCDEs, of which correlative coefficients (R~2) are 0.988, 0.958 and 0.959 and the root-mean-square-error of estimation are 0.134, 0.116 and 0.327 respectively.(2) QSPR models of lgPL and n-octanol/air partition coefficients lgK_(oa for PBDEs, which both contain three structural parameters. The values of R2 for the two models are both 0.997 while the values of RMSEE are 0.073 and 0.062 respectively.(3) QSPR models of lgKow and–lgS_ for PCDEs, which both have one variable (mean molecular polarizability,α). The values of R~2 for the two models are 0.978 and 0.866 and the values of RMSEE are 0.300 and 0.270 respectively.(4) The molecular structures of 24 substituted naphthaline compounds were optimized using Hartree-Fock and DFT methods at four different levels and the same means was used to obtain four three-parameter (EHOMO, q~+ andα) QSPR models of lgK_. The model at the HF/6-311G** level is the best one of which R2 is 0.9662 and RMSEE is 0.380.(5) QSPR study for environmental partition properties of PCDEs was also performed using position of Cl substitution method in which simple parameters of substitution position were taken as descriptors. The multiple linear regression was performed with GQSARF 2.0 and SSPS 12.0 for windows programs to obtain QSPR models of lgP_L, lgK_ and–lgS_ for PCDEs of which R~2 are 0.991, 0.983 and 0.965 and RMSEE are 0.311, 0.100 and 0.300 respectively.

采用密度泛函理论方法在B3LYP/6-31G*水平上对PCDEs、PBDEs和PCDDs的分子结构进行了全优化计算，以计算得到的量子化学参数作为理论描述符，采用GQSARF 2.0和SPSS 12.0 for windows统计程序进行正向逐步回归分析，建立了这些POPs的环境分配性质的QSPR模型：(1) PCDEs的过冷液体蒸汽压、正辛醇/水分配系数lgK_(ow和水溶解度-lgS_(w，l的QSPR模型，这3个QSPR模型的相关系数(R2)分别为0.988、0.958和0.959，估计的均方根误差分别为0.134、0.116和0.327；(2) PBDEs的lgPL和正辛醇/空气分配系数lgK_(oa的QSPR模型，这两个模型都包含三个分子结构参数，其R~2都为0.997，RSMEE分别为0.073和0.062；(3) PCDDs类化合物的lgK_和-lgS_w的QSPR模型，两个模型都只含一个变量，其R~2分别为0.978和0.866，RSMEE分别为0.300和0.270；(4)采用Hartree-Fock和DFT方法，在4种不同水平上优化计算了24个取代萘系列化合物的分子结构，采用上述同样的方法分别建立了四种水平上的三变量lgK_模型，通过比较得到，在HF/6-311G**水平计算得到的模型最好，R为0.966，RSMEE为0.380；(5)同时，采用氯原子取代位置方法对PCDEs的环境分配性质进行QSPR研究，建立了PCDEs的lgPL、lgK_和-lgS_的QSPR模型，其R~2分别为0.991、0.983和0.965，RSMEE分别为0.110、0.100和0.300。

The optimum input power density is presented by analyzing and calculating the discharge tube gas temperature of a 100 W copper vapor laser to avoid the "black center of beam".

通过对百瓦级铜蒸汽激光器放电管内气体温度的分析计算，给出了百瓦级器件为防止&黑心&现象输入功率密度的最佳值。

The results show that the precooling time of the probe is shortened significantly with the help of the vapor liquid separator, and decreases with the driven pressure. With the helical coiled wire and the helical mesh, significant thermal Oscillation corresponding the density-wave is observed in the precooling time. The average heat transfer coefficient enhances 1.5 times with the mentioned heat transfer enhancement techniques, and the temperature of the 2.5 min cryoprobe surface can reach -160℃ in 17℃ brine within 10 min.

结果表明：使用了快速预冷汽液分离器后，探针预冷时间大大缩短，并随驱动压力增大而减小；加入螺旋丝和螺旋丝网后，在预冷阶段出现明显的热力振荡，并伴有密度波振荡，平均换热系数为原来的1.5倍，在17℃生理盐水中10min时2.5min探针表面温度最低可达－160℃，大大提高了探针的冷却性能。

So, the purpose of the subject is to predict the density and the range of the vapor spread, the influential area timely, fast, effetely, ocular and to formulate the relate rescue measures according to it, to wish to provide the reference in order to control and handle the leakage accidents of the combustible liquids during the road transportation.

因此，本课题的研究目的就是在易燃液体在公路运输过程中发生泄漏事故后，能及时、迅速、有效、直观地对易燃液体蒸气在大气中的扩散浓度、扩散范围、影响区域做出预测并以此为依据制定相应的应急措施，希望能为公路运输易燃液体泄漏事故的控制和处理提供一点参考。

This EOS has been used to correlate the saturated vapor pressure and liquid density for 33 pure liquids over a wide range of temperature.

在统计缔合流体理论的基础上，导出了一个新的三参数状态方程。

The data allowed scientists to determine the vapor jets' speed and density as low as 9 miles (15 kilometers) above the surface.

科学家们根据数据确定表面蒸汽团的速度，密度低于9英里(15km)，从而计算出显现蒸汽的通风口的尺寸。

In order to find proper answers to these questions, the dynamics of changing of the vapor pressure, density and capillary constant of the ROS after establishment of the specified temperature conditions in the experimental setup without stirring the solution in the experimental cell have been analyzed.

为了发现适当的答复到这些问题，动力学改变汽压，密度和ROS的血丝常数，在没有引起在实验性细胞之后的解答分析了指定的温度条件的创立在实验性设定的。

In accordance with the characters of vapor phase linear low density polyethylene plant,this paper pointed out the main reasons for load fluctuation ,involving catalyst,composition of raw materials, control parameter of reaction temperature and the failures of other facilities related to the reaction.

针对气相法线型低密度聚乙烯装置的生产特点，分析指出生产负荷波动的主要原因有：催化剂、原料组分、反应温度控制参数以及与反应相关的其他系统设备故障的影响。

The state of the expanding metallic vapor, 2-D temperature, density and ionization in target, is determined by the energy deposit of EB and the ionization rate due to injecting electrons.

其中根据入射电子束的沉积能量及入射电子的电离率等计算随时间变化的靶区二维宏观参数。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。