流量测定

This research was conducted to use Gamma ray attenuation method to measure sediment concentration and to use water level change rate to determine flow rate.

本研究利用γ射线衰减原理测量含沙量、采用水位随时间的变化测定流量。

Apart from the determination by the German DIN standards regulating valve rated flow coefficients and adjust the characteristics of outside, HORA also in accordance with the requirements of the user measured more indicators related to the valve.

除了按德国DIN标准测定调节阀的额定流量系数及调节特性以外，HORA还能按用户的要求测取有关阀门的更多指标。

Liver blood flow of each group was observed by laser-Doppler flow instrument,and blood flow rate of liver microcirculation in each group was observed by intravital microscopy.Pathological examination and serum biochemistry were also performed.

每组分别以激光多普勒血流仪测定肝脏血流量并以显微活体视频技术观察肝脏微循环血流速度，同时进行肝脏病理学检查和血清生化学检查。

The mass flow rate and the impact force were measured and the average mixing velocity of the two phase fluid was obtained based on the mo mentum theorem.

基于动量定理，测定两相流体的质量流量和冲击力，从而得到质量平均的流体混合速度。

According to the evaporation equation, the evaporation degree of aerosol particles reaching ICP can be simulated, then we can get the value of useful mass transport rate, Wu, which is difficult to be gotten from experiment and can be used to assess the analytical performance and to optimize the operating parameters, such as solution and gas flow rate and the configurations of the nebulizer.

根据蒸发方程，可以模拟进入ICP的气溶胶粒子蒸发的程度，从而计算出实验上很难测定的有用质量传输速率Wu。本文通过Monte Carlo方法模拟了不同浓度的溶液、不同溶剂以及不同的载气流量、进样速度和雾化器的结构尺寸等变化对Wu的影响情况，并与实验结果进行比较，证明了模拟结果的可靠性，并依此选择最佳操作条件和雾化器的结构尺寸。

Some conclusions are drawn:instrument of the digital measure of radon must be standardized and only standardized by flow through radon gas source;gas flux of entering the scintillation chamber should be controlled or measured in the process of digital measure of radon.

指出对测氡仪器必须进行标定，而且必须用流通式氡气源来标定；在观测中应控制或测定进入闪烁室的气体流量。

The jet formation of nitromethane is taken shadowgraphy first, and effective discharge coefficient with a nozzle diameter of 2. 5mm is presented.

以再生式液体发射药火炮为工程背景，我们首次拍摄了硝基甲烷射流喷射瞬态变化过程，并实验测定了硝基甲烷从直径2.5mm直喷嘴喷射时的流量系数。

Slack water deposits are indicators of water level and age of paleoflood. They can be identified using Quaternary Period geology and hydrology, and can be aged using radioactive isotopes or other methods.

平流沉积物是洪水水位和发生年代记录的载体，利用第四纪地质学和水文学可以把它发掘出来并用放射性同位素或者其它断代方法测定它发生的年代，再通过断面恢复，进行流量推求，这就是古洪水研究。

Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis and spectrometric detection.

用流量分析法和光谱检出法测定亚硝酸氮和硝酸氮及两者的总含量CFA和

Methods Perfusion weighted imaging was performed in 45 cases of cerebral infarction. The sidetoside ratios of regional cerebral blood flow,regional cerebral blood volume and mean transit time were measured at duty lesion of ischemia. The hypoperfused cerebral areas and the stages of ischemia were defined as follows:compensation stage: rCBF was normal, rCBVwas increased, MTT was prolonged;decompensation stage: rCBF was slightly decreased, rCBV was normal or decreased, MTT was prolonged;preinfarction stage: rCBF and rCBV were decreased,MTT was prolonged.

利用磁共振灌注成像技术（perfusion weighted imaging，PWI）对45例缺血性脑血管病患者的责任病灶进行局部脑血流量，局部脑血容量，平均通过时间比值测定，确定低灌注脑区的影像学特点和缺血分期：代偿期（rCBF保持正常，rCBV升高，MTT延长）；失代偿期（rCBF轻度下降，rCBV正常或下降，MTT延长）；梗死前期：（rCBF下降，rCBV下降，MTT延长）。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。