The number of the limit cycles bifurcating in small quadratic perturbations of quadratic systems with an ischronous center is studied, it turns out that the cyclicity of the period annulus around one kind of quadratic...The number of the limit cycles bifurcating in small quadratic perturbations of quadratic systems with an ischronous center is studied, it turns out that the cyclicity of the period annulus around one kind of quadratic isochronous center is two.展开更多
护理学是一门实践性很强的学科,具有直观性和规范性强的特点,实验中心建设也具有其独特性。CSCL(Computer Support for Collaborative Learning,计算机支持的协同学习)的目标是为学生的自主学习、交流互动学习提供支持,这样将CSCL引入...护理学是一门实践性很强的学科,具有直观性和规范性强的特点,实验中心建设也具有其独特性。CSCL(Computer Support for Collaborative Learning,计算机支持的协同学习)的目标是为学生的自主学习、交流互动学习提供支持,这样将CSCL引入到护理实验教学示范中心建设中来,既可以满足学生个性化学习、模拟学习和协作学习的需求,又能实现实验室教学资源共享,对学生提高护理课程理论知识的理解和掌握及实践创新能力的培养都起着非常重要的作用。展开更多
基金Supported by the National Natural Science Foundation of China( No.195 310 70 ) and Natural Science Fundation ofHubei Province( No.98J12 1)
文摘The number of the limit cycles bifurcating in small quadratic perturbations of quadratic systems with an ischronous center is studied, it turns out that the cyclicity of the period annulus around one kind of quadratic isochronous center is two.
文摘护理学是一门实践性很强的学科,具有直观性和规范性强的特点,实验中心建设也具有其独特性。CSCL(Computer Support for Collaborative Learning,计算机支持的协同学习)的目标是为学生的自主学习、交流互动学习提供支持,这样将CSCL引入到护理实验教学示范中心建设中来,既可以满足学生个性化学习、模拟学习和协作学习的需求,又能实现实验室教学资源共享,对学生提高护理课程理论知识的理解和掌握及实践创新能力的培养都起着非常重要的作用。