切角

This article first antenna, microstrip theory, the circular polarization technology, the theoretical discussion, in this based on the microstrip antenna of circular polarization method - corner square microstrip antenna, and has done a design simulation , and then do the design and further research to improve and eventually get a resonant frequency (S11 reflection coefficient corresponding to the minimum frequency) for the 1.5GHz and 1.43GHz, the frequency of circular polarization for the 1.46GHz, S11 is less than -10dB relative bandwidth, the VSWR is less than 2 is about 8.8% relative bandwidth, axial ratio less than 3dB relative bandwidth of about 2.2% of the right circular polarization microstrip antenna design case, which proved very good the circular polarization microstrip antenna theory, also fully confirmed by a square corner design is a practical program, and select the appropriate regulation of sticks is indeed able to improve the performance of the antenna.

本文先对天线、微带理论、圆极化技术等进行了理论论述，在此基础上，提出圆极化微带天线的实现方法——切角方形微带天线，并对此做了设计仿真，后又对这一设计方案做了改进及进一步研究，最终得到一个谐振频率（反射系数S11 的最小值所对应的频率）为1.5GHz和1.43GHz，圆极化频率为1.46GHz，S11 小于-10dB 的相对带宽、驻波比小于2 的相对带宽约为8.8%，轴比小于3dB 的相对带宽约为2.2%的右旋圆极化微带天线的设计案例，从而很好的印证了圆极化微带天线理论，也充分证实了切角方形是一种切实可行的设计方案，而选取合适的调节枝则确能提高天线的性能。

A theoretical model for calculating the cutting angle with different crystal planes, orientations and tool orthogonal rakes are described in this paper. It is built with the ultra-precision cutting model by the principle of the maximum specific energy of shear deformation and the mechanism of change of the shear modulus with...

本文利用剪切变形比能最大及单晶材料不同晶面晶向剪切弹性模量不同的原理，结合超精密切削模型，从理论上计算出不同晶面、不同晶向及不同刀具前角超精密切削条件下的剪切角，得到其在不同切削条件下的变化规律，并由此解释了切削加工中由KDP晶体各向异性所导致的工件表面粗糙度的各向异性。

The negative shear area and angle φ′of negative shear plane in metal cutting are first found out and verified by experiments, and effects of angle φ′of negative shear plane on the change of cutting direction fracture formation is experimental studied in orthogonal cutting.

首次提出并证实了金属切削中负剪切区域和负剪切角φ′的存在，讨论了负剪切角φ′对切削方向亏缺形成及其变化的影响。

And the distribution of the magnetic shear angles exhibits the hemisphere sign rule as the asymmetry of helicity. In our dataset, 53% of the active regions in the south hemisphere have positive shear angle and 62

磁场剪切角具有南北半球符号的反对称手征性，在南半球有53％的活动区的磁场剪切角是正的，而在北半球有62％是负的。

The company has about 700 employees, the factory covers an area of about 15,000 square meters, plant area of 20,000 square meters to over the past few years development, already have a certain scale, the printing workshop of existing four-color Heidelberg presses, Mitsubishi four-color, five-color presses, Akiyama four-color printing presses, two-color Heidelberg presses, single-color machine, the entire computer paper cutter, plate-making equipment group; printed paper mounting after the workshop has a fully automatic machines, semi-automatic on the mounted machine , automatic water-based UV machine, fully automatic UV machine, polishing machine, pressure-ray machine, laminating machine, automatic rolling box machine, semi-automatic folder gluer and other equipment: fine line between many existing automatically be on the white plastic plastic machine, all-purpose adhesive on the glue machine, beer machine, cutter, sawing machine, grinding machine, gong machine, towel angle machine, tipping machine, sewing machine, angle cutter, portable drilling machine, wait until the equipment corns machine.

公司现有职工约700人，厂区占地面积约15000平方米，厂房使用面积20000平方米，以过几年来的发展，已拥有一定的规模，印刷车间现有海德堡四色印刷机，三菱四色、五色印刷机，秋山四色印刷机、海德堡双色印刷机、单色机、全电脑裁纸机、制版设备一批；印后车间拥有全自动裱纸机、半自动对裱机、全自动水性UV机、全自动UV机、上光机、压光机、覆膜机、全自动轧盒机、半自动糊盒机等设备：精品国间现有自动流水线多条，白胶上胶机、万能胶上胶机、啤机、切纸机、锯床、打磨机、锣机、巾角机、烫金机、针车、切角机、笔记本打孔机、鸡眼机等到设备。

The STM image is shown the surface structure of the single atomic height step for miscut angle of 0.5°,and the surface structure of the double atomic height step for miscut angle of 4.5°.

观察到错切角为0.5°时STM像为单原子高度台阶表面结构，错切角为4.5°时STM像为双原子高度台阶结构。

The shear angle was measured by means of spring "Quick-Stop" device at various cutting speeds.

基于对传统的剪切角模型的分析，借助快速落刀试验及直角切削力试验，获得了航空铝合金7050-T7451在切削加工中的剪切角以及前刀面的平均摩擦因数。

At last considering the effect of work piece and cutting speed the new shear angle model of aluminum alloy 7050-T7451 was established and proved to be more suitable for expressing the variety of shear angle in high speed cutting process.

最后，基于快速落刀实验和有限元仿真结果对高速切削剪切角模型的进行修正，综合考虑工件材料和切削速度对剪切角的影响，建立适用于铝合金7050-T7451的高速切削加工的切削方程式。

Early attempts to establish a mechanism with the shear angle related to theoretical models, such as the Merchant's proposed method of calculating shear angle, Lee and Shaffer made the slip-line field theory, etc.

早期机理研究试图建立起一种与剪切角相关的理论模型，如Merchant提出的剪切角计算方法、Lee和Shaffer提出的滑移线场理论等[1]。然而，到目前为止这些思路并没有取得令人满意的结果。

The results show that the ultimate stability bearing load by nonlinear analysis is close to the test load, they only have 10% deviation. For steel bridge towers, the correlation of the panels in the section of rectangle with chamfers is more obvious than that in the section of rectangle. If the four angles of the rectangle section were cut off, a panel with the smaller ratio of width to thickness forms, which can supply effective constraint to other weak panels with the larger ratio of width to thickness.

结果表明：第2类稳定计算得到的失稳极限荷载与实测荷载较为接近，两者相差10%；带切角矩形截面钢桥塔较矩形截面钢桥塔板件间的相关作用更加明显，对矩形截面钢桥塔进行切角，形成宽厚比较小的壁板，可以对宽厚比较大的弱板提供有效约束。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。