等轴

We calculate the field distribution near focus of an aplanatic system for incident ASPBs with different polarization orders and initial azimuthal angles, and based on the simulation results, we find some unique focusing properties of the beams, such as ever on-axis energy null, strong longitudinal field, and flowerlike intensity distribution at focus.

计算了不同偏振级次和偏振初始角的轴对称偏振光束当入射到无球差系统时在焦点附近的场分布，通过这些模拟结果，发现了该光束一些独特的聚焦特性，例如光轴强度始终为零、具有较强的轴向光场以及在焦点附近场呈现花瓣状分布等。

It is needed to study the influence on the detection effects, which is aroused by such as the level of integrity of the seismic prospecting event、the variety of the apparent dominant frequency of the Ricker wavelet.

为完善该方法，需要研究诸如地震勘探同相轴完整程度、组成同相轴的地震子波变化等对系统检测效果的影响。

Project content:According to the market demand,expand production of Four-star、and star series bike parts: front shaft、back shaft 、bike pump、front fork、steel ball、chain、chainwheel crank、cold patch glue、glue and other products for all kinds of bikes.

二、项目内容：根据市场需求，扩大生产"佛斯特"、"四星"、"恒星"牌系列自行车中轴、前后轴、飞轮、链条、曲柄、胶水、前叉、钢珠、打气筒等产品。

Discuss the influence of the factors of section forms(different ratios between limb length with limb width), the reinforcement that adjusts the bellyband ends, and the existence of stirrup on the limited values of axial compression ratio of the T, L shape section columns, and draw the variation law of the limited values of axial compression ratio along with the variation of theabove-mentioned factors.

讨论了截面形式、改善腹板端部的配筋、以及箍筋的存在等因素对T、L形截面柱的轴压比限值的影响，得出了轴压比限值随上述因素的变化规律。

Methods morphology ,opening,closing and hemodynamicon short axes section of large arteries and on long axessection of aorta were observed.results thickening,calcification ,hemodynamic,morphologic changes of the aortic wall were exacerated with increased age of patients.conclusion cdfi is of great valve in diagnosing bicuspid aortic valve.

重点通过大动脉短轴及主动脉长轴等切面观察二叶式主动脉瓣的形态、回声、启闭及血流动力学情况。结果：随着年龄的增长，瓣膜增厚、钙化、血液动力学、心脏形态学改变逐渐加重。结论：彩超对先天性二叶式主动脉瓣畸形及病变的诊断具有重要意义。

V belt driving device developed is superior to flexible plate coupling and roller chain driving in VNH behavior, working endurance and axial and lateral offset tolerance.

所开发的三角带传动装置在振动噪声性能、作寿命和对轴向以及径向偏心的容忍度等方面都优于常用的柔性板式联轴器和高速滚子链传动装置。

Howeer, few studies hae looked at changes of neurons within the caused by disturbance of axonal flow, the axon reaction, chromatolysis, and cell death as a result of mechanical compression of the entral

但是， 很少有研究关注腹侧神经根机械性压迫所致的神经元改变，如轴流，轴索反应，染色质溶解，细胞死亡等。

Has analyzed this company new product (after *SR-30, SR-24, SR-20,*SR-16, the SR-13 3/8 series) the production craft, the treating processes and the production efficiency, design a set primarily to include the guide rail, the driving gear, the chain drive, the reduction gear, the electric motor, the shaft coupling, the axis, the bearing, the key, the circlip by V installment and roll spare part and so on drive wheel installments,And completes the correlation selection and the corresponding mechanics examination, with realizes two to need the butt weld the marine riser automatically to, and in the synchro completes the further welding after the spot welding.

分析了该公司新型产品（包括＊SR-30、SR-24、SR-20、＊SR-16、SR-13 3/8系列）的生产工艺、处理过程及生产效率后，设计出一套以V型装置为主包括导轨、驱动轮、链传动、减速器、电动机、联轴器、轴、轴承、键、弹性挡圈及滚动轮等零部件的装置，并完成相关选材及相应的力学校核，用以实现两根需要正对焊接的隔水管自动对中，并在对中点焊后同步转动以完成进一步的焊接。

The major parts of the transmission include the transmission case , input shaft ,output shaft ,countershaft, driving gear ,transmission fork ,etc.

变速器的主要部件包括变速器壳、输入轴、输出轴、中间轴、传动齿轮、变速叉等。

Aiming at the mathematic model of shafting crankle coupling vibration based on the subsection continuous mass model,the multidimensional frequeney analysis method is put forward and developed.Combining frequency change with shafting configuration parameter,it's more favorable to have direct analysis.The method...

针对基于分段连续质量模型的轴系弯扭耦合振动数学模型，进一步简化并提出多维频率分析方法，将频率变化与轴系的结构参数联系起来，有利于直观分析，同时给出分析振型、共振频率及共振模态等的方法

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