等环的

Establish geometry model of hyperboloid clutch with rollers with differential geometry. We know that the line of tangent is beeline and validate it with Matlab.

利用微分几何相关知识建立了内外环的双曲面等距曲面及滚柱的几何模型，求解出其接触线为直线并用MATLAB进行了理论验证。

In the future network and information age,it can be expected that Error-Correcting Code will gain its widerap placation,and the research and develop work of it will have high practicalv alue and profound meaning.

本文在介绍近世代数群、环、域等概念的数学基础上，学习并总结了纠错码译码算法的发展和现状。

Fourteen MC nylons modified by three aromatic compounds containing quinoxaline ring were prepared. Their morphology, impact strength, water absorbency and melting behaviour were characterized.

合成了14种由三种含喹啉环的芳香化合物改性的聚己内酰胺，并对其形态、抗冲击强度、吸水性及熔融行为等进行了表征。

Compared to the existing non fragile H ∞ control results,the approach in this paper needs not any tuning of scalar or matrix and is less conservative.

文献 [3]说明了H∞，H2 ，L2 和μ等控制器的设计方法，当控制器存在参数不确定性或摄动时，其维持闭环系统稳定的能力并不

The work reported in Part 1 started with improving the synthesis of the chiral auxiliaries and Bu〓B, two important reagents needed for performing classic Evans asymmetric aldolization.

在第二部分工作中，完成了Aerangis Lactone等含有顺式双取代内酯环的天然产物的合成。

This control system includes main control model, current detection, position sensing, fault detection and protection, serial interface. Anisomerous bridge topology structure is adopted to design the power converters and driver circuit. Double closed loop based on velocity and current is adopted to control AC-motor.

其控制电路主要包括主控模块、电流检测模块、位置传感器模块、串口电路、故障检测和保护电路等；采用不对称桥式扑结构设计了功率变换器及其驱动电路模块；采用速度和电流双闭环的形式，完成对交流电机的控制。

The results show that:(1) When Cu〓 equatorially coordinated by four nitrogen atoms from amine ligands such as ethylenediamine, N-methylethylenediamine, 1, 2-diaminopropane and 1, 4, 8, 11-tetraazacyclotetradecane, etc., Cu〓 could be axially coordinated by oxygen atoms of-SO〓 group.

研究结果表明：（1）当Cu〓在赤道平面与来自胺配体（如乙二胺、N-甲基乙二胺、1，2-丙二胺和1，4，8，11-四氮杂环十四癸烷等）的四个氮原子配位后，在轴向则可以与来自磺酸根离子的-SO〓基团氧原子配位。

Results There were nNOS-immunopositive nerve endings in fibrous coat of capsule of cervical zygapophyseal joints,flava ligament,interspinalia ligament,supraspinale ligament and annulus fibrous of intervertebrale disc.

人颈段关节突关节囊、黄韧带、棘间韧带、棘上韧带和椎间盘的纤维环等结构的病变，常表现为颈肩痛。

In this paper, the latest progress of the nitration of deactivated aromatic compounds is reviewed in the point of view of nitrating agents, including nitrate-sulfuric acid, nitrate ester, nitric acid and nitrogen oxides.

本文从硝化试剂角度综述了近年来钝化芳环的硝化反应的进展，包括硝酸盐/硫酸、硝酸酯、硝酸、氮氧化物等硝化方法。

Methods A study of several eases of pelvic injury was done, in which biomechanics and classification of pelvic injury were analyzed, moreover imaging methods were compared with each other, such as fluoroscopy, X-ray photography, computerized tomography and so on.

研究数例法医学鉴定中骨盆损伤的案例，结合骨盆环的生物力学和骨盆损伤分型，并对X线透视、X线摄片检查、CT等检查方法进行比较。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。