论全球化语境下中国英语产生的必然性

在全球化语境下,英语的国际化不可避免的造成了英语在不同社会及文化中的本地化,世界各地的英语变体相继出现.世界英语变体的理论框架为中国英语能被看作世界英语变体之一提供了依据.英语在中国实现的功能进一步论证中国英语的出现是可以接受且必需的,中国英语有其产生的必然性.     

WAPN: a distributed wormhole attack detection approach for wireless sensor networks

As the applications of wireless sensor networks （WSNs） diversify, providing secure communication is emerging as a critical requirement. In this paper, we investigate the detection of wormhole attack, a serious security issue for WSNs. Wormhole attack is difficult to detect and prevent, as it can work without compromising sensor nodes or breaching the encryption key. We present a wormhole attack detection approach based on the probability distribution of the neighboring-node-number, WAPN, which helps the sensor nodes to judge distributively whether a wormhole attack is taking place and whether they are in the influencing area of the attack. WAPN can be easily implemented in resource-constrained WSNs without any additional requirements such as node localization, tight synchronization, or directional antennas. WAPN uses the neighboring-node-number as the judging criterion, since a wormhole usually results in a significant increase of the neighboring-node-number due to the extra attacking link. Firstly, we model the distribution of the neighboring-node-number in the form of a Bernoulli distribution. Then the model is simplified to meet the sensor nodes＇ constraints in computing and memory capacity. Finally, we propose a simple method to obtain the threshold number, which is used to detect the existence of a wormhole, Simulation results show that WAPN is effective under the conditions of different network topologies and wormhole parameters.     

加强高职院校学生的理想信念教育的途径和方法初探

本文仅就加强高职院校学生的理想信念教育的迫切性以及当前高职院校学生理想信念状况进行了阐释,对加强高职院校学生的理想信念教育的途径和方法进行了探索.     

Microfluidic fabrication of polymeric core-shell microspheres for controlled release applications

We report a facile and robust microfluidic method to fabricate polymeric core-shell microspheres as delivery vehicles for biomedical applications. The characteristics of core-shell microspheres can be precisely and easily tuned by manipulating the microfluidic double emulsion templates. The addition of a shell can significantly improve the versatility as well as functionality of these microspheres as delivery vehicles. We demonstrate that the nature of the shell material plays an important role in the properties of the core-shell delivery vehicles. The release kinetics is significantly influenced by the material of the shell and other characteristics such as the thickness. For example, by adding a poly(lactic-co-glycolic acid) (PLGA) shell to an alginate core, the encapsulation efficiency is enhanced and undesired leakage of hydrophilic actives is prevented. By contrast, adding an alginate shell to PLGA core can lead to a reduction of the initial release rate, thus extending the release period of hydrophobic actives. Microfluidic fabrication enables the generation of precisely controlled core-shell microspheres with a narrow size distribution, which enables the investigation of the relationship between the release kinetics of these microspheres and their characteristics. The approach of using core-shell particles as delivery vehicles creates new opportunities to customize the release kinetics of active ingredients.     

2012年度国家自然科学基金工程与材料科学领域“人才板块”项目申请与资助概况浅析

引言人才板块项目作为国家自然科学基金委员会(以下简称自然科学基金委)资助格局中的重要组成部分,项目申请数占总申请量的45%左右,以国家杰出青年科学基金和创新研究群体科学基金为代表的人才基金项目已成为国家自然科学基金(以下简称科学基金)系列中很有影响的两张"名片"。青年科学基金、优秀青年科学基金、国家杰出青年科学基     

Hip extension during the come-out of multiple forward and inward pike somersaulting dives is controlled by eccentric contraction of the hip flexors

Abstract

A modelling approach was used in the present study to investigate the role of the hip muscles during the come-out of forward and inward multiple somersaulting dives in a pike position. A planar two-segment model was used to simulate the somersault and come-out of three commonly performed dives from a 3-m springboard: forward two-and-one-half somersault pike dive (105B), forward three-and-one-half somersault pike dive (107B), and inward two-and-one-half somersault pike dive (405B). Three simulations were run for each dive: (1) hip angle was constrained to be constant, (2) hip torque was removed after 0.1 s, and (3) hip angle was constrained to a typical come-out time history used by elite divers. Simulation results indicated that hip flexion torque was required both to maintain a rigid pike position during somersault (range = 205.5–282.3 Nm) and to control the hip extension movement during the come-out (peak torque range = 355.8–548.1 Nm) in forward and inward multiple somersaulting dives. Coaches and divers should be aware that dry-land exercise drills producing hip extension movement by concentric actions of the hip extensor muscles do not replicate the neuromuscular control during the come-out of fast rotating dives.     

竞技视域下空手道运动中“控”的探骊

“控”是空手道运动的重要技术特征,对空手道组手比赛获胜起着至关重要的作用。文章运用文献资料法、田野调查法、录像分析法与专家访谈法,对空手道组手比赛中“控”的运用状况进行了分析与阐述,得出在空手道组手比赛中合理有效的对人的因素（自身、对手、裁判员、教练员、观众）与物的因素（场地、规则）控制是获取比赛胜利的核心环节。     

羽毛球单打比赛的节奏控制及影响因素探析

采用文献资料、逻辑推理等研究方法对羽毛球单打比赛的节奏控制及影响因素进行探讨与分析。结果表明：节奏控制在羽毛球单打比赛中的地位越来越重要,影响其节奏控制的因素主要有基本技术和特长技术、心理素质、战术意识及体能意志状况等。提出要针对影响节奏控制的因素,在训练中强化运动员的节奏意识,重视技、战术的节奏训练等建议。     

基于微信公众账号的图书馆移动信息服务研究

移动信息服务是图书馆开展信息服务的发展方向之一,微信作为一种新的即时通信产品,从开始就备受各界关注。首先分析了图书馆移动信息服务开展的现状,指出在开展移动信息服务中存在的问题;接着引入微信和微信公众账号,分析它们的特点和用户行为;总结了当前微信公众账号应用的常见模式;然后说明和分析构建基于微信公众账号的信息服务方式,提出符合图书馆行业特点的信息服务平台设想,分享了我校图书馆使用微信服务平台的经验;最后分析了微信的未来发展方向。