多元函数最佳逼近的精确阶

:关于找使得　Ω m( f ,1σ)～ Aσ( f )　 (σ→∞ ) .成立的充分条件和必要条件的 Timan问题被解决 ,必要条件是　Ω m( f ,1σ)～Ω m 1( f ,1σ) ,　 (σ→∞ ) .充分条件是　 ωmjej ( f ,1σj)～ (ωmj 1ej ( f,1σj)　 ( σj→∞ ,j=1,2 ,… ,n) .     

Improved determination of dynamic balance using the centre of mass and centre of pressure inclination variables in a complete golf swing cycle

Golf requires proper dynamic balance to accurately control the club head through a harmonious coordination of each human segment and joint. In this study, we evaluated the ability for dynamic balance during a golf swing by using the centre of mass (COM)–centre of pressure (COP) inclination variables. Twelve professional, 13 amateur and 10 novice golfers participated in this study. Six infrared cameras, two force platforms and SB-Clinic software were used to measure the net COM and COP trajectories. In order to evaluate dynamic balance ability, the COM–COP inclination angle, COM–COP inclination angular velocity and normalised COM–COP inclination angular jerk were used. Professional golfer group revealed a smaller COM–COP inclination angle and angular velocity than novice golfer group in the lead/trail direction (P < 0.01). In the normalised COM–COP inclination angular jerk, the professional golfer group showed a lower value than the other two groups in all directions. Professional golfers tend to exhibit improved dynamic balance, and this can be attributed to the neuromusculoskeletal system that maintains balance with proper postural control. This study has the potential to allow for an evaluation of the dynamic balance mechanism and will provide useful basic information for swing training and prevention of golf injuries.     

多元积分型Meyer-Knig-Zeller算子的L~p逼近

本文构造了一种多元积分型Meyer-K(?)nig-Zeller算子,给出了它在LP空间的逼近阶     

一类Baskakov-Durrmeyer型算子

研究M．Heilmann[1]引入的Baskakov-Durrmeyer型算子Mn（f，x）及其线性组合Mn，r（，x）的逼近，给出了逼近的正逆定理和高阶导数的特征刻划定理．     

改性沥青砼路面平整度的影响因素及对策

路基不均匀沉降、基层平整度、改性沥青混合料的级配、路面摊铺机械的操作及摊铺工艺、压实工艺、接缝工艺以及检查井的设置等都是控制改性沥青砼路面平整度的主要因素。笔者根据改性沥青砼路面工程实践经验认为:只有保证施工过程中加强对这些因素的控制管理,才能确保路面的平整度符合施工规范的要求。     

论英语课堂教学的流畅美

上好每一堂课是我们每一个教师孜孜不倦的追求。本文从思维、语言、气势等方面对英语课堂教学中追求流畅美进行探讨,以达到教学和谐艺术之美。     

阻尼RLW方程的周期强解

文中用Galerkin方法和先验估计证明了带有阻尼项的RLW方程周期边界问题周期强解的存在唯一性,并在较弱的光滑性条件下,得到了强解的光滑性。     

L~ψ空间的光滑模与K—泛函的等价性

本文在Ｌψ空间中引入了光滑模与Ｋ－泛函的概念，并证明了它们的等价性     

反馈控制系统解决快速性与平稳性之间的矛盾的实践

本文介绍了一种控制器的实现方法,它能较好解决快速性和平稳性之间的矛盾。该控制器的参数按工程最佳的方法整定,有灵活的参数调整功能,在现场调试时,可通过减少控制器的积分时间常数或增大比例系数来提高快速性,再通过调节反馈通道的微分负反馈分量来抑制超调,从而得到输出响应既快又稳的曲线。     

浅论散文的语言特点与翻译

众所周知,散文属于文学文体。它被看成是一种介于叙事文学与抒情文学之间的文学形式,也被看作是介于诗歌和小说之间的文学形式。散文语言最显著的特点是“体物言志,形散神聚”,因而在散文翻译时应辨证的处理好信与顺的关系,力求做到译文既神似又形似。