基于3E可持续发展框架的绿色图书馆构建策略研究

在分析国内绿色图书馆研究现状之后,介绍美国图书馆学会TFOE工作组的3E可持续发展框架理论,然后从建造绿色环保节能的图书馆建筑、培养有“绿色意识”的图书馆员、构建全面协调发展的馆藏体系、承担更多的社会责任和提供更公平高效的信息服务4个方面讨论基于3E可持续发展框架理论的绿色图书馆构建的相关策略。     

基于课堂讲授法的“1+3”教学模式研究

相对大学课堂传统教学模式,“1+3”教学模式以启发式教学思想的课堂讲授法为基础,在教学内容上增新、教学材料上丰富、教学方法上增加环节,是实现学习目标的有效教学模式之一。重点探讨“1+3”教学模式的基本含义、现实背景、理论基础、具体实施步骤以及实施这种教学模式的注意事项,以期改善课堂教学现状,提高课堂教学的有效性。     

从SCOAP3模式看图书馆资源建设的范式转变

介绍SCOAP3资助联盟将高能物理学术论文转为开放出版的基本模式、内容范围和运行机制,指出它所代表的开放出版资助方式更适合数字网络时代,能更有效、更经济地保障知识获取,强调这种模式同样服务于图书馆保障信息获取的本质目标,并为图书馆扩展信息服务、提高自身地位和作用提供新的空间。     

基于码表分布特征和重编码的 MP3Stego隐写分析

提出一种基于Huffman码表分布特征和重编码的MP3Stego隐写分析方法.该方法通过Huffman码表分布特征有效地反映了MP3Stego隐写造成的块间量化不均现象.利用重编码得到校准的载体音频,减少不同载体造成的差异,从而提高检测率.实验证明,该方法对MP3Stego有很好的检测效果,在极低的嵌入率下效果仍稳定.     

移动智能终端下3G网络低功耗延迟唤醒策略

突发性数据传输易导致3G网络工作模式从低功耗状态向高功耗状态迁移,状态切换加剧能耗开销.本文对移动终端网络通信行为进行分析,提出移动终端下3G网络低功耗延迟唤醒策略.该策略对网络数据进行延时敏感性划分,并据此进行不同时间的延时传输,延迟3G网络唤醒时间达到降耗目的.仿真实验表明,策略有效降低系统功耗,具有较强的可行性.     

北京永定河河岸带生态修复对河流水质的影响

为探讨河岸带生态修复措施对河流水质的直接影响,以永定河已修复的门城湖—莲石湖区段为研究对象,于2013年7—10月沿西岸选取8个采样点,测定溶解氧(DO)、氨氮(NH₄⁺—N)、硝氮(NO₃^-—N)和总磷(TP)的质量浓度.结果表明,河流DO浓度和各营养物质浓度均有明显的季节变化.大部分采样点的DO、NH₄⁺—N和TP浓度未达到地表水IV类水体标准.水生植物较多的河岸带处,河流NH₄⁺—N浓度较低.在生长旺季,长势好的水生植物越多,河流DO和NO₃^-—N浓度越高,TP浓度越低;在生长末期,枯落物较多的河岸带处,河流DO浓度较低,TP浓度较高.凸岸处的河流DO和NO₃^-—N浓度较高,而NH₄⁺—N浓度较低.因此,改变护岸类型、水生植物的多度及河岸的弯曲程度等河岸带结构特征可引起河流水质的变化.     

NBA中锋发展趋势及空间型中锋技术剖析

NBA比赛规则的改变和内线球员位置的模糊化使得中锋呈现出新的发展趋势,高强度、高对抗、快速攻防转换以及更加注重拉开空间对中锋的策应能力和远距离投篮能力提出了更高的要求,促使内线球员向全能空间型中锋转型。研究发现,空间型中锋技术更为全面,进攻方式多样,拥有较高的三分球出手次数和高效稳定的三分球命中率,具备良好的组织和策应能力;在助攻、触球后的传导球以及触球得分上都优于传统中锋;空间型中锋攻防空间更为开阔,丰富了球队技战术选择因而使用率更高。借鉴NBA中锋的发展,CBA应侧重培养中锋的速度和灵活性,提高中锋的策应、助攻和三分球投射能力。     

A cognitive TV white space-broadband power line MIMO system for indoor communication networks

Broadband power line communication (BPLC) is a promising solution to satisfy the growing data rate demands for broadband indoor communication networks. However, the BPLC transmission power spectral density (PSD) is restricted in the very high frequency (VHF) band to avoid harmful interference to the existing wireless services. In this paper, a new hybrid system is proposed utilizing BPLC and cognitive radio over TV white space (TVWS) to enhance the system capacity over BPLC in VHF, forming a VHF TVWS BPLC multiple-input multiple-output (MIMO) system. An iterative precoding algorithm is proposed to satisfy the interference limit at the TV primary user (PU) receiver (Rx) and enhance the ergodic capacity. Moreover, a power allocation algorithm is developed for the MIMO system to achieve the maximum ergodic capacity subject to the average total power constraint and limit of interference to TV PU. Simulation results demonstrate the significant enhancement in the achieved capacity by our proposed system in the VHF band compared to both previous cognitive and hybrid BPLC systems.     

Kinematic analysis of proximal-to-distal and simultaneous motion sequencing of straight punches

Consecutive proximal-to-distal sequencing of motion is considered to be integral for generating high velocity of distal segments in many sports. Simultaneous usage of proximal and distal segments as seen in martial arts is by far less well investigated. Therefore, the aim of the study was to characterise and differentiate the concepts of consecutive (CSM) and simultaneous (SSM) sequence of motion in straight reverse punches as practised in Practical Wing Chun. Four experienced martial artists succeeded an eligibility test for technical proficiency in both concepts and performed a total number of 20 straight punches per concept. Eight MX13 Vicon cameras (250 fps) and Visual3D were used for motion capture and analyses. Both motion concepts showed proximal-to-distal sequencing of maximal joint velocities but, in SSM, this was coupled with simultaneous initiation. Key characteristics were: high pelvis momentum and backswing of shoulder and elbow (CSM); and importance of shoulder involvement (SSM). Different ranges of motion, timing aspects and achieved maximal angular velocities distinguished both concepts, which led to differences (p < 0.05) in fist velocity at contact, execution time, distance and horizontal shift of the centre of mass. Proper application of both concepts depends on the environmental setting, situational requirements and individual fighting style.     

Kinetic and kinematic analysis of stamping impacts during simulated rucking in rugby union

Laceration injuries account for up to 23% of injuries in rugby union. They are frequently caused by studded footwear as a result of a player stamping onto another player during the ruck. Little is known about the kinetics and kinematics of rugby stamping impacts; current test methods assessing laceration injury risk of stud designs therefore lack informed test parameters. In this study, twelve participants stamped on an anthropomorphic test device in a one-on-one simulated ruck setting. Velocity and inclination angle of the foot prior to impact was determined from high-speed video footage. Total stamping force and individual stud force were measured using pressure sensors. Mean foot inbound velocity was 4.3 m ? s^?1 (range 2.1–6.3 m ? s^?1). Mean peak total force was 1246 N and mean peak stud force was 214 N. The total mean effective mass during stamping was 6.6 kg (range: 1.6–13.5 kg) and stud effective mass was 1.2 kg (range: 0.5–2.9 kg). These results provide representative test parameters for mechanical test devices designed to assess laceration injury risk of studded footwear for rugby union.