快速抛击练习对提高棒球击球能力的探讨

本文就快速抛击练习对提高棒球击球能力的作用及训练方法进行了分析探讨。     

面向高速信息网络的信息资源有效配置

本文在探讨网络信息资源有效配置的必要性和可能性的基础上,提出了“时间空间品种类型”三维一体的网络信息资源有效配置模式,指出在配置过程中我们应遵循社会经济福利最大化、以需求为导向、公平、市场手段和政府手段互补的配置原则。     

New progress in zeolite synthesis and catalysis

The rational design synthesis of zeolite catalysts with effective, environmentally benign and atom-economic routes is a major topic in the field of microporous materials, as it would avoid the high labor cost and inefficiency of traditional trial-and-error methods in developing new structures and dispel environmental concerns regarding the industrial mass production of zeolites. Catalytic applications of zeolite materials have expanded from conventional single functionalities, such as solid acids or selective oxidation catalysts to bi/multifunctionalities through combination with metals or metal oxides. This is a response to new requirements from petrochemical and fine chemical industries, such as precise control of product distribution, conversion of low-carbon resources for chemical production, and solutions to increasingly severe environmental problems related to CO₂ and NO_x. Thus, based on the systematic knowledge of zeolite chemistry and science that researchers have acquired in the past half-century and the development requirements, remarkable progress has been made in zeolite synthesis and catalysis in the past 10 years. This includes the manipulation of zeolitic monolayers derived from layered zeolites and germanosilicates to construct novel zeolite materials and effective and green zeolite syntheses as well as the synergistic interaction of zeolites and metal/metal oxides with different space distributions in the conversion of low-carbon resources. With many zeolite catalysts and catalytic processes being developed, our understanding of the close relationship between zeolite synthesis, structure and catalytic properties has deepened. Researchers are gradually approaching the goal of rationally designing zeolite catalysts with precisely controlled activity and selectivity for particular applications.     

ScanSAR图像舰船目标快速检测方法

提出一种ScanSAR图像舰船目标快速检测方法.该方法通过周期性局部亮度变换技术降低了Scalloping效应对舰船检测的影响,在ScanSAR图像拼接前进行基于OpenMP的改进的双参数CFAR舰船目标检测,不仅避免了拼缝对舰船检测造成的巨大影响,而且极大地缩短了舰船检测的时间,提高了舰船检测的时效性,最后通过图像后处理从拼接后的ScanSAR图像中得到最终的检测结果.对15幅ScanSAR图像进行了实验,结果表明,该方法在提高检测性能的同时,检测的时效性也有明显改善.     

Lives on file: a critical assessment of the career portfolio genre

This article examines the ideological dimensions of the career portfolio. This genre, an increasingly common part of high school and post-secondary school curricula, invites students to collect items from multiple domains and to reflect upon what these items say about who they are and where they are going. Through a critical analysis of the primary instructional form used in one school's career portfolio program, this article describes how the genre calls students to present themselves as certain kinds of people inhabiting certain kinds of worlds. More specifically, it is argued the genre prompts students to individualize themselves and endorse in their portfolios a middle-class ideology of self-cultivation and self-promotion.     

一种优化的无缝快速切换方案的研究与实现

在研究移动IPv6快速切换协议（FMIPv6）的基础上,针对其存在的问题,提出一种优化的无缝快速切换方案。该方案引入新的控制信息协议（ICMPv6）控制消息和多隧道的概念,同时将转交地址（CoA）配置和重复地址检查（DAD）过程提前至切换前完成。仿真实验表明,相较于FMIPv6协议,优化后的算法具有更好的切换性能和服务质量。     

拉么铜锌多金属矿石快速优先浮选研究及实践

多金属矿石中矿物种类繁多,嵌布关系复杂,矿石品位波动大。采用快速优先浮选直接得出优质铜精矿,有利于降低铜精矿含杂和提高回收率。     

刍议中国篮球传统快攻风格的嬗变

通过查阅文献资料、录像观察、数理统计等方法,对中国男子篮球队传统风格嬗变原因进行探讨分析,研究认为：传统快攻风格是中国篮球运动实践中的宝贵财富;中国本土篮球理念同欧美篮球理念之间存在较大的差别,中国篮球运动实践的全盘西化致使传统风格面临濒危的境地;中国篮球快攻技战术应该在尊重传统的基础上,继承和发扬传统快攻风格。     

影响快速阅读理解能力的因素和教学对策

本文介绍了新四级考试中快速阅读的题型特点和要求,并分析了学生快速阅读过程中的三种阅读障碍,最后提出了在大学英语课堂中提高快速阅读能力的教学对策。     

穴位刺激提高田径运动员快速力量的实效性研究

采用穴位刺激等实验方法,探讨提高田径运动员快速力量的实效性。结果显示,该方法有助于提高田径运动员的快速力量,能有效地提高田径运动员立定跳远和60m跑的成绩,可作为田径运动训练中提高运动员快速力量的一种补充手段。