spherical cyclic curve

This paper present the geometrical properties of some typical trajectories for finitely separated positions,such as cylindrical curve,spherical curve,constant inclination ruled surface and constant distance ruled surface.

给出了有限分离位置圆柱面曲线、球面曲线、定斜直纹面及定距直纹面等几类空间轨迹的几何特征。

A fundamental property of spherical curves in G, s is obtained.

给出了R~3中球面曲线的一个基本性质,并用以得到某些经典的或新的整体结果。

This paper presents a necessary and sufficient condition that the recurrent hypersurface M in a Riemannian space with quasi-constant curvature is locally symmetric,and shows that the complete irreducible birecurrent hypersurface M in a Riemannian space with quasi-constant curvature is recurrent if the generating element of N is a normal vector field or pungent vector field of M.

给出拟常曲率空问Ｎ中循环超曲面Ｍ局部对称的一个充要条件，并且证明若拟常曲率空间Ｎ的生成元是其完备不可约双循环超曲面Ｍ的法向量或切向量，则Ｍ是循环的。

The paper has tested the effect of the various welding parameters on the thermal cycle curves of the points where the hole is sealed when the left and right beads are connected in condition of all position backing welding of SA335 P91 boiler tube.

测试了各种焊接工艺参数对SA335P91炉管全位置打底焊左右焊道交汇时小孔闭合处的热循环曲线的影响。

The welding temperature field of the ultrafine grain steel was computer simulated in this paper,and the thermal cycle curve was obtained.

应用有限元方法建立了超级钢焊接温度场的数学模型,对5 mm厚、400 MPa超级钢等离子弧焊接温度场和热循环进行了模拟和分析;利用模拟得到的热影响区热循环曲线,根据晶粒长大动力学原理对热影响区晶粒尺寸进行预测。

The simulation results are in good accordance with the actual thermal cycle curve, which proved the model is correct.

MARC平台,编写FORTRAN子程序来实现移动热源的加载,并采用了MARC软件对厚板带极埋弧堆焊温度场进行了数值模拟,同时对焊缝形貌及试验测得的热循环曲线进行验证,得到了与试验结果较吻合的温度场计算结果。

Then,the thermal cycling curves at different time and different positions are given to make sure of how the temperature field is space-time distributed with different welding parameters.

推导了一种简易直观的搅拌摩擦焊接热源模型,并将模型应用于焊接过程温度场动态仿真,得到了焊接过程中不同时刻和位置处的热循环曲线,确立了温度场在时间和空间上的分布规律,并研究了不同焊接工艺参数时的温度场。

Research on Determination System for Welding Thermal Cycle Curve and Phase Transformation Point;

焊接热循环曲线及其相变点测试系统的研究

Multiplier Curve Out-of-Range Types

增强曲线越界循环类型

Ease Curve Out-of-Range Types

减缓曲线越界循环类型

Analysis on the Influence of the Circular Economy to Kuznets Curve;

循环经济对环境库兹涅茨曲线影响分析

Study of Venous Doppler Flow Velocity Curve and Fetal Circulation

静脉多普勒流速曲线与胎儿循环的研究

Adopted far infrared metal heating tube, fast heating and energy saving.

采用远红外线金属电热管加热、热风循环，加热速度快、温度均匀、省电。

The infrared ray warms up the magnetic force treatment, ameliorative blood circulation, instauration physical strength.

红外线温热磁力治疗，改善血液循环，恢复体力。

Software Development on the Performance On-line Monitoring of Gas/steam Combined Cycle;

燃气—蒸汽联合循环在线热力性能监测软件开发

Research and Application of Solvent Circulation on Line of Hot Dip Zinc Plating

热镀锌助镀液在线循环使用的研究与应用

Analysis on the Urgency to Develop Cyclic Economy in Xi′an Based on the Application of Approach of Environmental Kuznets Curve;

西安循环经济发展的紧迫性分析——基于环境库兹涅茨曲线的方法

recirculating ball-lever and peg steering gear

循环球-曲柄销式转向器

Influence of thermal cycle on impact toughness of HAZ of high-Nb pipeline steel

热循环对高铌管线钢焊接热影响区冲击韧性的影响

Effect on HAZ Structure and Toughness of Welding Thermal Cycle for High Nb X70 Grade Pipeline Steel

焊接热循环对高Nb X70级管线钢热影响区组织和韧性的影响

Thehardening curve can be divided into three stages, i. e. first, rapid-hardening andsaturated stage.

循环硬化曲线可以分成三个阶段:初始阶段、速硬化阶段和饱和阶段。

X-ray tube assembly heating curve

Ｘ射线管组件发热曲线

synthetic apparatus for weld thermal cycle

焊接热循环模拟装置

convective thermal control

流体对流循环热控制

circular auto-control heating oven

自动控制循环加热炉