多腔的

Finally, we conclude that the spectra have essentially different characterizations for N-atom mazer with N being odd and even integers.

通过对入射原子团包含奇数和偶数个原子的腔场光谱的比较，我们得出了以下结论：对于多原子微激射器，含奇数与偶数原子的入射原子团激发的腔场的光谱的特征存在显著差异。

On the basis of comparison of several algorithms of the calculation of unstable resonator"s mode. Fast Fourier transform method is chosen in this paper. The model of multi-layer distribution of gain is established. Sampling granularity in real space used in FFT, quotient of guard band and distance between subsections are made certain respectively. The convergence criterion of root-mean-square of plural y which is the quotient of the optical field"s distributions separated by one pass is established. Under the circs of multi-kind of distribution of gain and different measurement of distortion, the output optical field distribution is calculated.

在比较了各种计算腔模方法的基础上，根据角谱传播理论，选择FFT算法，建立谐振腔内多层增益分布模型，分别确定了FFT算法的空间采样间隔、保护带系数和分段计算的距离，选取光场往返一次之比的均方根值收敛准则，计算多种增益分布、不同镜面变形时的谐振腔输出光场分布，同时计算该光场的远场分布和传输有限距离之后的分布。

Intralobar pulmonary sequestration usually present as multiloculated cyst containing fluid and/or air, or irregular mass in CT scan, multi-slice CT angiography and 3D reconstruction can depict supplying artery and draining vein clearly, so it could be an ideal modality for evaluating this condition.

叶内型肺隔离症多表现为下肺基底段的多房液气囊腔或者不规则团块，多层螺旋CT血管造影及三维重建能清晰显示供血动脉及回流静脉，是一种理想的无创性检查方法。

Two point spinal punctured,epidural was applied at the T 10 12 interspace,subarachnoid anesthesia was performed at L 2-3 interspace in the lateral position,using a 7gauge spinal needle,to receiving spinally isobaric solution 2-2.2ml of 0.75% bupiva...

采用两点穿刺，先于T10 -12间隙硬膜外穿刺并头端置入硬膜外导管，后用 7号腰穿针于L2 -3 间隙穿刺，有脑脊液流出后，以 0 。1ml/s的速度蛛网膜下腔注入 0 。75 %布比卡因 2 - 2 。2ml，进腹后酌情硬膜外腔追加 2 %利多卡因或 2 %利多卡因- 0 。75 %布比卡因混合液，平均用药量(11.70± 2 。6 3)ml。

Based on the laser longitudinal mode splitting theory, a novel scheme of dual-frequency laser with large frequency-difference is presented using electrically controlled birefringence of liquid crystal, and the transmitted resonant mode splitting by birefringent of Fabry-Perot etalon has been analyzed theoretically. A new element of liquid crystal Fabry-Perot etalon is designed and fabricated, which serves as aselector and splitter of both laser longitudinal modes and Fabry-Perot etalons transmitted resonant modes. Two different experimental systems of laser-diode end-pumped Nd:YAG laser have been set up using two different LDs, and the transmission of liquid-crystal cell have been measured. When the empty LCFP is inserted in the cavity of high-power LD pumped Nd:YAG laser, the oscillation of a single laser longitudinal mode have been observed, such a result shows that the designed and fabricated LCFP element is capable of selecting single axial mode. While an anti-reflected liquid crystal cell is inserted in the cavity of Nd:YAG laser end-pumped by the high-power LD, it is difficult to confirm weather the laser longitudinal modes have been spitted or not. The subject is summarized in this thesis and the improvement of the project has been presented.

论文以激光纵模的分裂理论为基础，提出了可望获得几十GHz甚至上百GHz的液晶电控双折射双频Nd：YAG激光器的总体方案，并对用双折射效应分裂F-P标准具透射谐振模进行了理论分析；设计并加工了一种集激光纵模选择、激光纵模分裂和F-P标准具谐振透射模分裂于一体的多功能元件——液晶电控双折射F-P标准具；建立了两种不同功率激光二极管端面泵浦的Nd：YAG激光实验系统，并对液晶盒的透射性质进行了测试；将未灌注液晶的空液晶F-P摘要标准具插入大功率LD泵浦Nd：、叭G激光谐振腔内，观察到了单纵模激光输出，说明所设计和加工的液晶F一P标准具具有纵模选择能力；将镀有增透膜的液晶盒插入大功率LD泵浦Nd八7AG激光谐振腔内，是否产生了激光纵模分裂现象还难以确定。

Results three different CT patterns were observed,a target lesion,a reniform mass,a sausage shaped mass,with a lower attenuation centrally,representing the intussuscepted mesentery.

结果 10 例CT扫描均可见多层靶环形、肾形或香肠形软组织影，中央部为脂肪和血管轴面影。2 例淋巴瘤多处可见肿大融合的淋巴结及肠壁不规则增厚，肠腔内造影剂充盈不均，1 例术中发现肠系膜过长而引起Tret's 韧带疝。

The research of VCO attracts extensive attention of scientists all over the world, especially scientists working in the field of military science and technology. Types of improved VCO have appeared in the last two decades, such as, reflex triodes, reditrons, vircator with e-beam modulation, resonant cavity frequency locking vircators, multi-vircator phase locking devices, etc.

在过去二十多年中，出现了多种改进性能的虚阴极振荡器，如：反射三极管、Reditron、、谐振腔锁频虚阴极振荡器、多个虚阴极振荡器相位锁定装置、双间隙虚阴极振荡器、各种反馈式虚阴极振荡器等等。

And we present a scheme for multi-party superdense coding by using multi-atom in cavity QED.

另外，我们研究了一个在腔QED中使用多原子实现多组份密集编码的方案。

The plane-parallel resonant cavity is built up in theory with the U-shaped bending waveguide for TM mode. The beam splitting and convergence effect are also discussed for the structure composed of filling-factor graded wave-like 2D-PC and one-dimensional multilayer thin films.

利用TM模的U型转弯波导构建了新型的平行平面谐振腔，并指出由填充率渐变型波状结构二维光子晶体和一维多层薄膜构成的混合结构在光分束和抑制光束发散方面的作用及其在平行平面谐振腔中的潜在应用。

A backing bar assembly (20) has a plurality of positively positionable backing bar units (40) which are retained within an inverted U-shaped housing by semi-cylindrical lifters (68) which are adjusted by adjustment screws (60) connected to the housing.

一种靠背梁组件(20)，具有多个通过半圆柱形的提升机构(68)保持在一个倒置U形的腔室内的可适当定位的靠背梁单元(40)，提升机构通过与腔室相连的调节螺丝(60)进行调节。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐