平均密度

Examples are industrial discharge such as brine, living sewage disposal, cooling water of power plant which is discharged to the river, dust or waste hot gas which is let to the atmosphere from chimney and cooling tower, and bilge water which is released to the port water area.

当废水或废气排放到环境流体中时，废流体的密度往往与环境流体的密度不同，这种由于密度差而产生的浮力不仅影响平均流本身，而且更主要的影响湍流及受湍流影响的动量、热量和质量的交换。

Recordings from the STN exhibited an increase in the background activity and an irregular firing pattern, with a mean rate of (49±13) Hz. The mean cell density was (58±14) cells /mm, with an average length from upper bounder to lower bounder of (58±08) mm. The movementrelated cells were located primarily in the dorsolateral sector of the STN, with the leg area located medial along the mediolateral axis and centrally along the anteroposterior axis, compared with the arm area.

STN细胞电信号为高频、高幅及背景噪声较高的簇状放电，平均放电频率(49±13) Hz，平均细胞密度(58±14)个/mm，上、下界间平均长度(58±08) mm；运动相关细胞多位于背外侧部，下肢偏内侧，上肢偏外侧，亦可记录到&震颤同步细胞&。

Results Eight species belonged to three families, two orders of rodent animals and seven species of fleas were found in this area. Rattus losea and Xenopsylla cheopis were dominant species, R.flavipectus , R.norvegicus , Suncus murinus , and Banolicota indica were familiar species. The annual average density of rodents, the infected rate with flea of rodents, index of fleas, index of X.cheopis and free flea in room were 10.58%, 28.38%, 0.7916, 0.5702 and 0.0515 respectively.

结果 合浦县鼠疫疫源地的啮齿动物共有2目3科8种，以黄毛鼠为优势鼠种，黄胸鼠、褐家鼠、臭鼩鼱和板齿鼠为常见种；蚤类有7种，以印鼠客蚤为优势蚤种；年平均鼠密度、平均鼠体染蚤率、平均蚤指数和印鼠客蚤指数分别为10.58%、28.38%、0.7916和0.5702，地面游离蚤指数为0.0515。

The Y-TZP nanoceramics with an average grain size of 60 nm and a relative density of 98% were prepared by pressureless sintering.

采用无压烧结获得了相对密度为98%、平均晶粒尺寸为60nm的Y-TZP纳米陶瓷。Y-TZP纳米陶瓷的显微硬度主要取决于陶瓷的相对密度、相结构和晶粒尺寸，即陶瓷的四方相质量分数越高，相对密度越大，晶粒尺寸越小，则显微硬度越高。

They can reach 72.04% and 84.5% separately(P.05). 2. The methods such as Percoll uncontinuous density gradient centrifugation, isolation according to the different adhesiveness can be used to isolate and purify rabbit SSC effectively. Spermatogonia mainly distribute between the gradient 27% to 35%(density between 1.0410g/ml to 1.0508g/ml).

Percoll 不连续密度梯度离心和差异粘附等方法可以有效的对兔精原细胞进行分离纯化，其中精原细胞主要分布于密度梯度为27%-35%(密度 1.0410g/ml~1.0508g/ml)的带间，此带中精原细胞的纯度平均达到 60.42%(P.01)。

According to the relationship between the shear rate and the energy dissipation rate,a method for calculating the average shear rate based on the volumetrically average energy dissipation rate is presented.

根据能量耗散率与剪切率的关系，提出了按流体的体积平均能量耗散率计算流体平均剪切率的方法，即可根据流体的密度、平均流速、管道直径、流动的摩擦因子或摩阻压降以及流变参数计算牛顿流体和幂律流体管流的平均剪切率。

Using a CCD camera system.the FESD of CVD films inlaid withnano-sized diamond grains,which were deposited on molybdenum film/〓 ceramicsubstrates,was obtained to reach 〓.The emission current density was 7mA/〓.These cathodes,through further improvement of FESD,are possibly used to make flatback lamps applied in liquid crystal display.

金刚石镶嵌非晶碳薄膜阴极/钼电极/氧化铝衬底结构的平均场发射点密度可达〓，场发射电流密度为〓，这样的发射点密度的阴极可能作为液晶显示器的平面背光源灯使用。

This article indicates that when the average temperature of gas in gas-insulated electric equipment is some greater than the temperature of gas density relay then the gas density relay can't reflex the gas density correctly too and gives a positive error.

本文指出，当电气设备内气体平均温度高于密度继电器温度一定程度时，气体密度继电器也不能正确反映电气设备内的气体密度，而出现正误差。

With analysing the the fatigue mechanism, the general mode of interply fatigue damage propagation is denoted by delamination length and crack density. Based on the power-law, the relationship between number of cycles and delamination length and crack density are established. The specimen is modeled as an equivalent six-ply material system. Starting with the analysis of interply stress, the interply shear stress under cyclic loading is calculated by using nonlinear three-demension FEA. According to the stage regularity of fatigue damage propagation, such models as average strain, effective modulus, ratio of delamination length and crack density, experimental relationship between crack density and effective modulus, are proposed by introducing subsection coefficient.

通过对疲劳机理的分析，确定了以脱层长度和裂纹密度表示的层间疲劳损伤演化的一般模式，利用指数法则建立了脱层长度和裂纹密度随疲劳循环周次变化的关系；从层间应力分析入手，以等效六层的材料模型对循环载荷下的层间剪切应力进行了三维非线性有限元分析；根据疲劳损伤扩展的阶段性，引入分段系数，分别建立了平均应变与载荷循环周次的分段线性模拟模型、有效刚度随载荷循环周次的变化关系模型、裂纹密度变化和脱层长度变化关系随载荷循环周次变化的分段线性模型以及疲劳裂纹密度和有效刚度关系的经验模型。

Input-layer contains seven nerve cells (sailor average maritime experience、average shipping years、average standard wind days、average river velocity 、visibility、water depth and traffic density) and output-layer contains four nerve cells (great accident、large accident、common accident and small accident).The test that use the data of historical occurrence level of maritime accidents in ChongQing water area is done, the result shows the feasibility of the predictive model.

最后本文用VC++制作界面，基于MATLAB的神经网络工具箱建立了水上交通事故的BP神经网络预测系统，采取三层BP神经网络，输入层有7个输入神经元(船员平均水上资历、平均船龄、平均标准风天数、水域平均流速、能见度、水深和交通密度)，输出层有4个神经元(重大事故、大事故、一般事故和小事故)，并通过对长江干线重庆水域的预测来检验模型的效果。

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。