科学与技术

Using numerical analysis and visual technology, the parameters of the known Rayleigh van der pol equation are discussed in detail The relation between the limit circle and chaos strange attractors is foun

通过数值分析及科学可视化技术，对著名的 Rayleigh Van Der Pol方程的参数进行较详细的讨论，获得该方程的混沌吸引子与极限环的关系

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

燕山大学亚稳材料制备技术与科学国家重点实验室，河北秦皇岛 066004

Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China

燕山大学亚稳材料制备技术与科学国家重点实验室，河北秦皇岛 066004

State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,Hebei 066004,China

燕山大学亚稳材料制备技术与科学国家重点实验室，河北秦皇岛 066004

Institute of Mechanical Engineering, National Key Laboratory of Metastable Materials Science and

燕山大学机械工程学院，亚稳材料制备技术与科学国家重点实验室，河北秦皇岛

State Key Laboratory of Metastable Materials Science and Technology, Yanshan University

燕山大学亚稳材料制备技术与科学国家重点实验室，秦皇岛 066004

JP3〗State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinghuangdao 066044,China

燕山大学亚稳材料制备技术与科学国家重点实验室，河北秦皇岛 066004

Department of Pharmaceutic Project,School of Biotechnology and Food Science,Tianjin Commerce University,Tianjin 300134,China

天津商业大学生物技术与食品科学学院，天津 300134

Department of Pharmaceutic Project,School of Biotechnology and Food Science,Tianjin Commerce University,Tianjin,300134,China

作者：王丽娟作者单位：天津商学院生物技术与食品科学学院，天津 300134

With the development of photogrammetry and spatial information sciences, we have found many new methods to solve the technical problem in surveying and mapping project.

随着摄影测量与空间信息科学领域，我们已经找到了许多新的方法来解决技术问题的测绘项目。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。