查询词典 helical

GHz ridge－loaded helical groove slow wave structure with a 20kV electron beam are given and the investigations of the effect of the ridge dimensions and electron beam parameters on the small signal gain are carried out. It is indicated from the calculation results that this type of structure is suitable for use as s SWS of high power, high gain but narrow passband millimeter TWT, of which the 3dB gain bandwidth is 3.4%. In order to increase the bandwidth, the reduction of the ridge gap or the increase of the electron beam current in an allowable range may be useful.

GHz的脊棱加载慢波结构的具体尺寸，并对此结构中小信号增益随脊尺寸的变化情况及电子注参数对其影响进行了研究，计算结果表明：此结构适宜于作为高增益窄带毫米波大功率行波管的慢波线，其3dB增益带宽为3.4%，为了展宽其工作带宽，可以适当减小间隙宽度，也可在一定范围内提高电子注电流。

Helical gear modeling; finite element analysis; transition fillet

斜齿轮建模；有限元分析；齿根应力

These are single stage/helical screw direct drive compressors with their engine speed synchronized with the compressor suction.

这些压缩机都是单级/螺旋型螺杆式直接驱动压缩机，它们的发动机转速与压缩机抽吸速度同步。

Influences of the electron-beam velocity spread, the period and depth of the helical corrugations on the efficiency are studied.

在此基础上，对电子束速度离散、螺旋开槽周期和开槽深度对效率的影响，进行了非线性模拟研究。

Objective To assess the value of helical CT densitometry in diagnosing peripheral pulmonary embolism.

目的 探讨螺旋CT平扫与强化扫描肺实质密度测量在周围性肺栓塞诊断中的作用。

Objective:To evaluate the clinical value of multi-slice helical CTthree-dimensional angiography as an assistant method for diagnosing cerebral infarctions.

目的：探讨多层面螺旋CT三维血管造影(3D-CTA)诊断脑梗死的临床价值。

Materials and Methods Helical CT was performed with 3.0mm slice thickness and 1.0～1.2 pitch in 10 normal subjects and 36 patients with upper airway diseases. In the healthy group, the upper airway shaded surface display was processed by using different reconstruction interval (1.0～3.0mm) and upper threshold (0～-900HU), while in the patient group, SSD, RaySum and integrated 3D images were made respectively.

材料与方法对10例正常和36例上气道病变的患者进行轴位螺旋CT扫描，层厚3.0mm，正常组采用不同重建间隔、阈值作气道表面遮盖法重建，病变组分别作气道SSD、RaySum重建和叠加成像。

Its mating gear is called a worm gear, which is not a true helical gear.

他的对应的齿轮叫做蜗杆传动装置，他并不时严格意义上的交叉轴螺旋齿轮。

Its mating gear is called a worm gear, which is not a true helical gear.

其交配齿轮称为蜗轮，这是不是真正的螺旋齿轮。

The cold precision forging of the helical gear is thoroughly studied by theory analysis, numerical simulation and experiment analysis.

本文采用理论分析、数值模拟与工艺试验相结合的研究方法，对斜齿轮的冷精锻过程进行了深入的研究。

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。