关于一类n维自映射列扰动的稳定性

1981年,L.Block发现在一维自映射中,Sarkovskii定理对映射的扰动而言是稳定的;文[1]针对一类可降的n维自映射,证明了其扰动也是稳定的;本文主要将这一扰动稳定性推广到一类可降的n维自映射列中去.     

德国职业技术教育的地位及其启示

分析德国职业技术教育的基本模式及其在德国经济发展中的重要影响 ,结合我国职教现状指出了我们的差距以及今后的发展方向     

内禀方程中的符号法则

本介绍内禀方程中简便实用的符号法则，并以实例说明它的应用。     

BEPCII LINAC束流轨道校正方法研究及程序设计

北京正负电子对撞机升级改造工程(BEPCII)的直线注入器(LINAC)要求建立束流轨道的自动校正系统,为此对束流轨道偏离的产生原因和轨道校正的方法进行了研究,并采用VC⁺⁺语言编写了相应的校正程序,利用最小二乘法原理对束流轨道的校正进行了模拟计算,取得了较为理想的结果。     

Revisit,Reform, and Redesign: A Novel Dissection Approach for Demonstrating Anatomy of the Orbit for Continuing Professional Development Education

Advanced postgraduate medical education for health-care professionals is constantly evolving. Understanding facial anatomy and especially its vascular system is crucial when performing soft tissue filler injections to avoid adverse events including tissue loss or irreversible blindness. Standard anatomical resources often fall short of elucidating clinically relevant concepts in more highly specialized areas of interest. A novel dissection approach for demonstrating the anatomy of the lateral orbit was presented at scientific meetings to participants from dermatology, plastic surgery, and general practice. Results from the post-course online survey (n = 52) were analyzed. The results of the survey reveal a high educational impact and a high clinical relevance of the novel dissection approach. In addition, the majority of respondents (97.7%; n = 51) felt that the exposed anatomical structure of the orbit and face improved their ability to safely perform cosmetic procedures on the face. More experienced respondents who had previously attended at least five cadaveric dissections were more likely to strongly agree that reviewing anatomy through this novel dissection approach increased their confidence in avoiding periorbital vascular danger zones. As minimally invasive outpatient procedures continue to evolve, practicing physicians and mid-level providers often face the challenge of having to reconcile preexisting anatomical knowledge with new clinical practice. Skills required to navigate high impact anatomy include visualization of structures that form the navigational landscape and avoidance of key danger zones. The novel dissection approach to the lateral orbit reflects the increasing focus on revisiting, reforming, and redesigning anatomy for continuing professional development activities.     

二类微分系统（Ⅲ）类方程的同宿分支

通过分析未扰系统的同宿轨在小扰动下的稳定流形和不稳定流形之间的相对位置,研究了平面二次微分系统具有如下形式的（Ⅲ）类方程x=-y＋δx＋mxy＋ny^2,y=x（1＋ax＋by）（b≠0,n≠0）的同宿分支极限环的问题．给出了系统分别存在稳定极限环和不稳定极限环的条件．     

奥运会男子田径快速力量性项群演进轨迹及其动力因素分析

通过对历届奥运会田径男子快速力量性项群比赛前3名成绩进行整理统计，对其成绩发展变化过程和成绩的递进情况进行定量分析。结果表明：不同单项间发展速度存在着不平衡性，田径快速力量性项群成绩一直都表现出持续和快速的增长，呈现出波浪式发展趋势。同时，科学技术的进步和经济的发展也可以改变成绩的发展曲线。通过对历届奥运会成绩的统计分析，用详实的数据来定量研究奥运会快速力量性项群的发展特征及其未来发展趋势，为田径运动的发展提供参考。     

谈现代标枪投掷技术的特点与发展趋势

能力是基础,技术是关键,这是现代标枪的投掷特点和发展趋势。因此在投掷过程中首先要了解标枪在空中的运行轨迹并结合标枪的特点采取相适应的出手角和冲击角,才能发挥运动员身体最大潜能获得良好运动成绩。     

韩国企业成长轨迹与我国企业改革

分析了韩国企业的发展轨迹及其在成长中形成的内外关系，认为我国企业的改革必须正确处理企业与政府、企业与金融、企业产权与经营等内外关系，为企业创造良好的宏观环境。无论是“抓大”或“放小”都要以市场规律为准则，以技术进步和培育企业创新能力为动力，以公平竞争为基础     

浅议唐宋词的发展轨迹

从唐五代至宋末,词经历了由民间传唱到文人创作,由俚俗到典雅,由简单粗浅到繁富精雕的演进过程。本文大体描述了唐宋词的萌芽、发展、鼎盛和衰微的变化轨迹。