Comparing with the traditional He-Ne laser narrow beam collimating method, it has the advantages of the less influence of air disturb, minor light beam drift and high stability of the datum line.

與傳統(tǒng)的He-Ne激光細(xì)光束準(zhǔn)直法相比，這種方法受大氣擾動(dòng)的影響小国产一级a爱做片视频，光束漂移小，準(zhǔn)直基線的穩(wěn)定性好。

Bout this Aumann[8] has provided some methods,connecting lines between two boundary curves,shaping ruled surface, and adding some developable conditions to ruled surface.

umann提出的方法是在兩邊界曲線之間連直線欧美大片aaaaa级，形成直紋面，然后給直紋面加上可展條件免费看全过程曰批40分钟。

Main products of OMMA are High Frequency Electrotome (DD-2 serials) with independent intellectual property rights and two serial accessories of High Frequency Electrotome, such as Bipolar Diathermy Forceps and Medical Pedal Switch. Bipolar Diathermy Forceps has four regular models, such as gun-shaped forceps, gun-shaped pincett, straight forceps and straight pincett, and subdivides into 48 specs.

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Based on the table of matrix element of spectrum decomposition, the Helmhotz matrix can be decomposed by recursion of the direct solution. A numerical comparison has been made with the spectrum LU decomposition and direct solution.

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Coupling systems between LD and optical fiber are separated into two categories: micro-lens optical fiber system and disjunct lens one.

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It consists of steering wheel, steering shaft, worm, gear sector, pitman arm drag link, steering

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"It consists of steering wheel, steering shaft, worm, gear sector, pitman arm drag link, steering knuckle arm, king pin, steering arms, tie rod, front axle and steering knuckle."

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In this thesis, we focus on the theory for the interaction of molecular dipole moment with external electric field and use the numerical simulation to investigate the rotational state-selection of polar molecules in a hexapole electric field and the laser-field role of alignment or orientation for molecules based on semi-classical treatment, the detail is the numerical calculation for a quantum mechanical treatment of molecules and their interaction with the external field and a classical electrodynamical treatment for static electric field.

本文研究是在描述分子偶極矩（永久偶極矩或誘導(dǎo)偶極矩）和外電場(chǎng)相互作用的基礎(chǔ)上色8久久人人97超碰香蕉987，我們建立了對(duì)分子態(tài)選擇和角動(dòng)量取向、準(zhǔn)直研究的半經(jīng)典理論框架（即分子體系狀態(tài)毛片一级一区免费网站、能量及與外場(chǎng)相互作用使用量子理論描述欧洲欧美精品VA在线观看，分子的運(yùn)動(dòng)軌跡使用經(jīng)典電動(dòng)力學(xué)描述）国产伦精品一区二区三区娃女，并利用數(shù)值計(jì)算方法對(duì)靜電場(chǎng)和隨時(shí)間變化電場(chǎng)作用下分子的轉(zhuǎn)動(dòng)態(tài)選擇、取向和準(zhǔn)直過(guò)程進(jìn)行了研究一个色桃花综合亚洲综合77综合。

The place of the innovation of this plan depends on becoming ball gear and dish when form emery wheel undertakes clench the teeth moves, ball gear is not to bypass the upend axis of ball heart turns, circle parallel to turn at crossing the axis of the upend axis of ball heart however, dish the motion of form emery wheel is the translation inside 2 dimension plane.

該方案的創(chuàng)新之處在于當(dāng)球齒輪和盤(pán)形砂輪進(jìn)行嚙合運(yùn)動(dòng)時(shí)黄色视频免费在线网站，球齒輪并不是繞過(guò)球心的豎直軸轉(zhuǎn)動(dòng)，而是繞平行于過(guò)球心的豎直軸的軸轉(zhuǎn)動(dòng)日韩电影久久久久久精品视频，盤(pán)形砂輪的運(yùn)動(dòng)是在二維平面內(nèi)的平動(dòng)网友自拍日韩视频网站。

By using the CFD software FLUENT, the inner-flow field of centrifugal fans with ruled-surface impeller versus with enveloping surface impeller has been simulated. The static pressure distribution, the dynamic pressure distribution, the total pressure distribution, the turbulent intensity and the speed vector of the two kinds of centrifugal fans are then analyzed and compared. From the calculating results, we found that the pressure distribution, the speed vector and other parameters of the two kinds of centrifugal fans are basically same. This implies that the tool-path generating arithmetic for the machining of the impeller can meet the aerodynamic requirements of the centrifugal fan. Furthermore the method can provide proof for designing department to establish sound manufacturing tolerance for impeller.

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