对圆的

The radial vibration of a piezoelectric ceramic thin ring and a metal thin circular ring are analyzed and their electro-mechanical equivalent circuits are obtained.

该换能器由一个厚度方向极化的压电陶瓷薄圆环及一个金属圆环组成。对压电陶瓷圆环和金属圆环的径向振动分别进行了分析，得到了各自机电等效电路。

By means of analyzing the influence of OD surface roundness error on the outer raceway of bearing ring, the processing method of bearing on internal grinder electromagnetic centerless clamper was improved, the influence of roundness error on outer raceway was decreased, meanwhile, the product quality was raised with less waste products.

通过分析轴承环外径表面圆度误差对轴承环外滚道的影响，改进了轴承在内圆磨床电磁无心夹具上的加工方法，降低了轴承环外径定位表面圆度误差对轴承环外滚道的影响，提高产品质量，达到了降低废品损失的目地。

On the base of the analysis of the static fbd under diametric compression , numerical analysis and compare are performed on the dynamic stress field of the brazilian disk and fbd used in the testing tensile strength under shpb

在对静态平台压缩巴西圆盘进行的数值分析的基础上，本文分析了shpb动态劈裂拉伸实验中巴西圆盘和平台巴西圆盘的动态应力场，并对结果进行了比较。

The comparison of the predominant bacterial community structure in the gastrointestinal walls between Lutjanus sebae (Cuvier, 1816) and Ephippus orbis (Bloch, 1787) based on 16S rDNA PCR-DGGE fingerprint using a culture-independent method was conducted in the paper. The results showed that abundant bacterium were planted in the gastrointestinal walls of both marine finfish species, the similarity was above 50% in the community structures in the gastrointestinal walls with the highest similarity of 67% in the bacterial composition between the intestinal wall of Luljonus sebae and that of Ephippus orbis, and the walls of the stomach and the intestinal in one fish shared the same most predominant bacteria species, which might reflect the same aquaculture environment and the diet fed for both finfish species.

本文采用免培养的16S rDNA梯度凝胶电泳技术对集约化海水网箱养殖川纹笛鲷Lutjanus sebae、及圆白鲳Ephippus orbis消化道壁优势菌群结构进行了比较分析研究结果显示川纹笛鲷及圆白鲳消化道壁存在着大量细菌群落，对DGGE指纹图谱聚类分析表明两种鱼肠道壁及胃壁菌群组成相似度高于50%，其中二者肠道壁细菌组成相似性最高(67%)，这些可能与两种鱼养殖在同一水域、摄食相同饵料相关，另外通过软件对DGGE指纹带谱相对丰度分析表明同种鱼肠道壁及胃壁具有相同最大优势菌群。

Abstract］ Background and purpose:The imaging of the skull base is challenging in nasopharyngeal carcinoma, through studying visualization and the appearance of foramen ovale,foramen rotundum,foramen spinosum,hypoglossal canal and nerve which can be identified on registration of CT and MRI for nasopharyngeal carcinoma, in order to define the target volume of nasopharyngeal carcinoma in radiotherapy planning.

为明确MRI对鼻咽癌颅底区域靶区显示的情况，分析无颅神经侵犯鼻咽癌患者的CT、MRI，比较圆孔、卵圆孔、棘孔、舌下神经管及舌下神经CT、MRI的显示情况和影像表现，探讨圆孔、卵圆孔及棘孔、舌下神经管及舌下神经在鼻咽癌放射治疗靶区勾画的意义。

In this paper, a region approximation idea that means using a "fat curve" with a width to approximate the offset curve is proposed, and a complete set of algorithms to approximate offset curve using disk Bézier curve are given and implemented. In the algorithms, the optimal and uniform approximate curve of the offset curve as the central curve of the Disk Bézier curve is found by using Remez method, and then the upper optimal and uniform approximation principle is proposed to compute the error radius function of the Disk Bézier curve. Thus, the whole Disk Bézier curve can be obtained. In the end of this paper, the approximate effect of the Disk Bézier curve is not only analyzed and assessed, but also some specific examples are provided.

提出用一条带宽度的"胖曲线"来逼近上述等距曲线的区域逼近思想，并建立与实现了圆域Bézier曲线等距逼近的整套算法，包括应用Remez方法求出等距曲线的最佳一致逼近曲线作为圆域Bézier曲线的中心曲线，提出上控最佳一致逼近的原理求出圆域Bézier曲线的误差半径函数，以及确定整条圆域Bézier曲线，最后还对该圆域Bézier逼近的效果做了分析和考核，并给出了一些具体实例。

Based on the analysis and investigations of dual-band microstrip annular ring slot antenna, a novel miniaturized dual-band annular ring slot antenna for WLAN applications is presented. It utilizes two rectangle notches to overcome the problem of resonant effects caused by the distance between inner and outer ring slots.

基于对微带双圆环缝隙天线的研究与分析，通过连接型矩形槽设计克服了内、外环距对谐振效果的影响，提出了一种应用于无线局域网通信的小型双频圆环缝隙天线，并且可以实现圆极化。

To overcome the drawbacks in the weight and cost of the antenna with the corrugated soft surface, a new patch antenna with patch rings is designed. Its weight is about 1/4 less than the antenna with the corrugated soft surface and it is inexpensive. Good experimental results are obtained. The radiation pattern of the antenna is more rotationally symmetric, and a more reduction on the sidelobe levels of the antenna is achieved as compared to the antenna with the corrugated soft surface. In conclusion, in the present thesis both theoretical and experimental research works have been carried out intensively on patch antennas based on photonic-bandgap structures.

为了克服皱褶软表面天线份量重，加工费用贵等缺点，我们对空气介质的皱褶圆环结构软表面天线进行了改进，将周期分布的皱褶圆环平面化，并保持结构的软表面特性，设计出了一种新的平面圆环结构的软表面天线并进行了实验研究，加工的平面圆环结构天线比皱褶圆环结构天线重量减轻了约1/4，加工费用大大降低，所取得的实验结果显示，该平面圆环结构软表面天线的方向图的轴对称性得到了改善，在俯仰角从0°～-90°的范围内天线H面的波束与E面重合，与皱褶圆环结构相比，天线的旁瓣和背瓣受到了更大的抑制，E面方向图上+120°方向的旁瓣被明显削弱。

Business Scope: 1, ONLY licensing carbide circular saw blades, the products manufactured using imported materials, as compared with the same price products to extend the service life of more than 10%; applicable to all kinds of wood (including solid wood, particleboard, MDF and various MDF), aluminum alloy, rigid plastic, acrylic and other materials cutting; 2, the Company may in accordance with customers cutting materials and cutting of different specifications to choose custom-made special carbide circular saw blades; 3, In order to fully utilize resources, reduce costs, the company offers carbide tooth circular saw blades for the overall processing services; 4, the company's carbide circular saw blades used to provide full-service customers, in view of: a, blade matrix used for a period of time will produce deformation; b, saw in the use of the course will be part of tooth loss; c, saw the use of a period of time would not sharp blade; above phenomenon will not only greatly reduce blade life, at the same time will affect the use of effect.

ONLY牌硬质合金圆锯片，该产品全部采用进口材料制造，与同价格产品相比使用寿命延长10%以上；适用于各种木材（包括实木、刨花板、中纤板及各种密度板）、铝合金、硬质塑料、压克力等材料的切割；2、本公司可根据客户切割材料和切削方式的不同选择订做特殊规格硬质合金圆锯片；3、为充分利用资源、降低成本，本公司提供硬质合金圆锯片整体换齿加工服务；4、本公司对硬质合金圆锯片使用客户提供全方位服务，针对：a、锯片基体使用一段时间后会产生变形；b、锯片在使用过程中会出现部分齿脱落；c、锯片使用一段时间后刀刃会不锋利；以上现象出现，不仅会大大降低锯片使用寿命，同时会影响使用效果。

To scientifically determine caliber of future general purpose aerial bomb, the relationship between bomb caliber and damage capability of different warhead of aerial bomb, the influence of bomb caliber on airplane load, and the influence of modern technology development on bomb caliber.

为科学选定未来主用航空炸弹的圆径，文中分析了炸弹圆径与不同类型航弹战斗部破坏作用之间的关系、炸弹圆径对飞机挂载量的影响，以及现代技术的发展对炸弹圆径的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。