查询词典 subcooled

The numerical results are helpful to a better understanding of the physical mechanism of subcooled nucleate boiling.

建立的模型有助于从机理上实现低温液体过冷流动沸腾传热的准确预测。

At the region of fully developed nucleate boiling, the influences of both fluid velocity and subcooled temperature are reduced gradually.

在完全发展核沸腾区，流速与次冷度对加热铜片表面之温度则逐渐失去影响力。

Producing of onset of nucleate boiling with subcooled boiling is early at same condition.

研究结果表明：自然循环欠热沸腾起始点的热力学平衡干度对加热量、进口温度、系统压力有着更大的敏感特性，在同等条件下，更早发生欠热沸腾现象。

The experimental results show that the time-average data of the FC-72 transient saturated and subcooled flow boiling heat transfer characteristics are not affected to a significant degree by the amplitude and period of the coolant mass flux oscillation. In fact, they resemble these for the stable flow boiling.

由实验结果发现介电冷却液的振荡振幅和周期对时间平均的FC-72暂态的饱和态和次冷态流动沸腾热传特徵没有明显的影响，类似稳态的流动沸腾。

The subcooled boiling states were visualized by Shadowgraph visualization technique and the pressure oscillation was measured by the pressure sensor.

在过冷态超流氦沸腾中，运用可视化方法对不同过冷度下的沸腾过程进行了观测，同时运用压力传感器详细研究了沸腾过程中的压力振荡。

It is found that the fouling rate is lowered during subcooled fow boiling by carrying gas injection, and the influence of carrying gas injection on fouling of convective heat transfer is more obvious than that of subcooled flow boiling; morphology of CaCO〓 crystallization fouling exhibits self-similarity and the fractal dimensions of CaCO〓 crystallization fouling are determined from the gray scale distribution of the SEM images by box-dimension method. The value of the crystallization fouling surface fractal dimensions reveals the complexity of the surface, and can be used as an import parameter for the investigation of influence of carrying gas injection on scale formation.

实验发现：引入载气，过冷流动沸腾结垢速率降低，但引入载气对过冷流动沸腾结垢速率的影响要弱于对对流传热结垢速率的影响；CaCO〓结晶垢具有统计自相似性，即分形特征；用盒子维法测定了CaCO〓结晶垢的分维值，分维值的大小反映了换热面上生成的结晶垢表面复杂程度，可用于描述引入载气对污垢的形成作用。

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 characteristics of CaCO〓 crystallization fouling on heat transfer surface in subcooled flow boiling flowing upward system are investigated. The influence of carrying gas injection (using N〓 as carrying gas) in the system on the scale formation is also studied.

5对过冷流动沸腾过程CaCO〓在竖直换热面上的结垢机理进行了实验研究，同时在流动系统中引入载气，考察其对污垢形成的作用。

ABSTRACT As an effective way of heat transfer, subcooled boiling has been studied extensively on its mechanism and application in heat exch...

在过去几十年中，人们对欠热沸腾这一高效换热方式的机理以及应用进行了广泛而深入的研究。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。