查询词典 particle

This article is based on thyristor-controlled phase-shifting technology for the exchange regulator's magnetic particle testing rechargeable power control demagnetization discussed in detail and design a voltage control circuit.

本文正是基于移相控制的可控硅交流调压技术对磁粉检测的充退磁电源控制进行了详细论述并设计出调压控制电路。

The simulated results of dendrite microstructure and particle distribution are in good agreement with the experimental.

模拟得到的颗粒分布及微观组织与实验结果吻合较好。

The particle mass distribution could be used to calculate the specific stacking dens...

通过分形粒度分布与实际粒度分布的比较，验证了模型的正确性。

The influence of non-uniform flow and particle density distribution on the simulation results was discussed.

分析了流体的非稳态流动及颗粒的密度分布对模拟结果的影响。

The results showed that the frame density and particle size distribution of the catalyst have significant impacts on the fluidization performances.

结果表明，HCC催化剂的骨架密度、筛分组成等物理性质对流化行为影响很大。

This paper studies the main geometrical parameter such as angle, height, width, stagger and the upper width in dentation and trapezoid flow path, firstly, uses the single-phase numerical simulation of the computational fluid dynamics technique to analyse the influence of different geometrical parameter on discharge coefficient and flow state exponent of drip emitter. Secondly, uses the two-phases numerical simulation of CFD (1% sand content ) to analyse the influence of the above mentioned geometrical parameter on the contribution regulation of sand and anti-clogging performance. Thirdly, uses the PIV （ particle Tracking Velocimetry ） technique which can see the small-scale flow path to observe and test the trajectories and velocities of solid particles in labyrinth flow path, and analyses the basic factors which can influence the movement characteristic of solid particles and the flow state in flow path.

本文以齿形流道、梯形流道为主要研究对象，以流道转角、流道高，流道宽、偏差量及梯形流道上底宽为主要结构参数，首先应用 CFD 单相流数值模拟技术对不同结构参数灌水器流道水力性能进行模拟，分析了不同结构参数对流态指数和流量系数的影响，其次，应用 CFD 两相流（含沙量为1%）数值模拟技术分析了结构参数对含沙量分布规律和抗堵塞性能的影响，然后，应用 PIV 可视化测试方法测试了固体颗粒在流道内运行轨迹及速度，分析了影响固体颗粒运动特性及流道内流体流态的基本因素，最后，对上述流道结构形式通过模具加工及滴灌带试制，进行了标准化测试（ GB/T 17187-1997 农业灌溉设备滴头技术规范和试验方法与 ISO 标准 ISO /TC23 /SC18 /WG5N4短周期堵塞测试程序），测试结果验证了 CFD 模拟结果，并提出了迷宫结构流道灌水器的抗堵塞设计方法。

A new high flow rate,multichannel parallel plate denuder sampling system has been developed which is capable of determining the particle size distributions and the semi-volatile organic compounds which can be lost from particles during sampling.

已研制出一种新的高流速率，多通道平行盘溶蚀器取样系统，它能确定微粒大小的分布，以及在取样期间从微位失去的具有半挥发性的有机混合物。

Experiments on purification technologies for the conversion of cornstalk biomass into the industrial product were made to produce cornstalk gas in the down-flow fixed by the gasifier. The experiment focused on the technical procedures for deoxygenation. catalytic cracking of tar, hydrogenation, etc. Quality straw syngas was produced for methanol synthesis. The catalysis of methanol synthesis for the production of cornstalk syngas was earned out in a tubular-flow integral and isothermal reactor under the pressure of 5MPa over Cu-based catalyst C301 (particle size: 0.833mm×0.351mm), a catalyst made in China. Thirty-three sets of test data were obtained.

为了实现秸秆类生物质合成燃料甲醇的工业转化，有效利用生物质能，对下吸式固定床气化炉产生的低热值玉米秸秆燃气进行除氧、分解焦油和配氢等纯化试验，制备出合成甲醇的优质秸秆合成气，在直流流动等温积分反应器中，使用国产C301铜基催化剂，催化剂粒度为20~40目(0.833mm×0.351mm)，在5MPa反应压力下，对玉米秸秆合成气进行催化合成甲醇试验研究，获得33套试验数据。

The characteristics of changed Sr/Ba coincide with particle size and macroelement analysis. The higher Sr/Ba shows depauperization and increasing salinity.

Sr／Ba值的升降变化特征与粒度分析结果和常量元素分析结果都十分吻合，底部的高值说明湖面萎缩，盐度增加；56cm（公元1923年）以下相对平稳，56cm以后出现剧烈波动，这是人类活动对环境扰动的结果。

The particle density criterion and the temperature criterion of instability for the imperfect Fermi gas with weakly attractive interaction are given, and the dependance of the critical density of particles on the temperature...

给出了不稳定性的粒子数密度判据和温度判据，就不同逸度情况下临界粒子数密度的具体表达结果以及温度、粒子质量和吸引相互作用对临界粒子数密度的影响进行了讨论。

This immediately brings us to the next part of this article: creating an output "replace function".

下面进入文章的第二部分：建立一个"缓存处理函数"。

He was elected as an International Ornithological Committee member in 2002 during the 24th IOC held in Beijing.

现为中国鸟类学会理事和WPA 专家组成员。2002年被推选为国际鸟类委员会委员。