查询词典 high velocity

Secondly, the silver based catalysts modified by phosphorus, zirconium, zinc, potassium and so on using molecular sieve as carrier, which were produced by ion-exchange method, had also good catalytic performance for 1,2-propane glycol oxidation to methylglyoxal. The conversion of 1,2-propane glycol and the selectivity of methylglyoxal were both high, and the impurity such as formaldehyde and acetaldehyde in the product is little. At the condition of the temperature 300 ℃, the molar ratio of oxygen to 1,2-propane glycol 1.7:1, the space velocity 6000h~(-1), and the concentration of 1,2-propane glycol 70wt%, the conversion of 1,2-propane glycol is 90% and the selectivity of methylglyoxal is 45% on the Ag-P catalyst.

其次对采用离子交换法制备的负载在分子筛上的银系催化剂进行了研究，发现此催化剂在助催化剂磷、锆、锌、钾等的作用下对丙二醇的低温氧化脱氢具有很高的活性，可以得到较好的丙酮醛的收率，并且产物中的甲醛、乙醛副产物的量比较低；经过对Ag-P催化剂上反应条件的考察，发现当温度为300℃、氧醇比1.7：1、空速6000h~(-1)、丙二醇浓度为70wt%时，丙二醇的转化率为90%，丙酮醛的选择性为45%。

A worm and worm gear are used to provide a high angular-velocity reduction between nonintersecting shafts which are usually at right angle.

蠕虫和蜗轮使用，以提供高角速减之间nonintersecting槽这通常是在直角。

A worm and worm gear are used to provide a high angular-velocity reduction between nonintersecting shafts which are usually at right angle.

蜗杆和蜗轮通常是用于向垂直相交轴之间的传动提供大的角速度减速比。

Although the swept-scan technique is currently employed in high-frequency ultrasound systems, the continuous transducer movement may have nonnegligible effects on accuracy of velocity estimation.

虽然扫掠式扫瞄已应用於目前的高频系统，然而探头的连续移动对於流速的估计有著不可忽略的影响。

In this paper ,move ment pri nci ple of rocket i n direction pi pe was got by dy— namic si mulation ,and effect characteristic consideri ng contact stiffness ,detent force and nozzle thrust misalignment a— bout pitchi ng angle velocity was analysis .All the study set foundationfor further study of high—lowpressure launch sys— te m.

通 过发射仿真分析，获得了火箭弹在高低压发射系统中的内弹道变化规律，分析了火箭弹与定向器的接触刚度、耳轴扭转刚度、尾喷管推力偏心等因素对俯仰角速度的影响特性，所得结论为火箭武器高低压发射系统的进一步相关研究奠定了基础。

The fracture reasons of high strength PC steel wire are analyzed, it's considered that center segregation, central cavitation, poriness and inclusion are the metallurgical reasons which lead to the facture of PC steel wire and in the rolling process, differential coping quality, microcrack caused by surface defect, abnormal microstructure caused by burnt and improper cooling velocity, the ears on the head of the wire, overlapping of the wire rod itself are the main reasons which lead to the facture of PC steel wire. At the same time, inappropriate pickling, differential phosphorization quality, the bad heat treatment quality, the generation of crack in the improper drawing and transverse crack caused by abnormal laying of the drawing die are also the reasons of the cracking of PC wire.

对高强度PC钢丝断裂原因进行了分析，认为连铸坯的中心偏析、中心缩孔、疏松和夹杂是导致PC钢丝断裂的冶金原因；轧制过程中，较差的修磨质量、表面缺陷导致的微裂纹，过烧以及不适当的冷却速度导致的非正常显微组织，盘条头部的耳子、盘条本身折叠是导致PC钢丝断裂的主要原因；同时，不恰当的酸洗、较差的磷化及热处理质量、不适当拉丝裂纹的产生、拉拔模具安放不正导致的横裂也是PC钢丝断裂的原因。

The velocity-stress pseudospectral method, an efficiently numerical modeling method, is easy to implement, with a high computation efficiency and can overcome numerical diffusion of the frequency efficiently.

模拟结果表明，伪谱法是一种有效的地震波数值模拟方法：易于实现，计算速度快、计算效率高，其计算速度是有限差分方法的数倍，能有效克服数值频散。

The primary phase formation and phase evolution during growth processes related to the undercooling D T and solidification velocity V were systematically investigated by the means of high undercooling and laser resolidification techniques.

由于材料的最终组织取决于凝固初期的相选择和凝固后期的组织演化过程，因此对非平衡条件下包晶合金中的相形成规律研究具有相当重要的理论意义和应用前景。

It was found the flow velocity gradients around the gas-tunnel was high enough to cause air mixture and sand-core washing-out, the casting should be with good sinkhead and gas-venting ability.

对铸造过程充型模拟的计算结果可知，在气道附近区域，流体流动的速度梯度很大，容易出现卷气、冲刷砂芯等现象，因此，在这些区域出现气孔、针孔和缩孔、砂孔等缺陷的可能性很大，为此，必须保证铸件凝固补缩良好、排气通畅。

An SLon pilot continuous centrifugal concentrator (SLon pilot centrifugal concentrator) was used to study the effects of drum rotation speed and reciprocating velocity of water sprays on the separation performance of the concentrator under the optimum conditions of feed volume flow rate (24.5±0.4) L/min, feed solids content 20% and impacting pressure of water sprays 0.45 MPa, with the high gradient magnetic separation concentrate assaying 52.42% Fe from fine hematite tailings as test material.

摘 要：采用SLon实验型连续式离心机(简称SLon实验型离心机)，以高梯度磁选细粒赤铁矿尾矿得到的磁性产物(52.42% Fe)为试样，在给料体积速率为(24.5±0.4) L/min、给料固体浓度为20%和水束流冲击压力为0.45 MPa的条件下，研究转鼓转速和水束流往复速度对连续离心分离指标的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。