图书馆群体成员结构分析

研究图书馆的群体结构对于人力资源的科学组织、利用,搞好读者服务工作,充分开发群体动力具有十分重要的意义,提出图书馆群体心理结构分析。     

Use of probabilistic and deterministic measures to identify unfavorable earthquake records

This study introduces measures to identify resonant （concentration of energy in a single or a few frequencies） or unfavorable earthquake ground motions. Probabilistic measures based on the entropy rate and the geometric properties of the power spectral density function （PSDF） of the ground acceleration are developed first. Subsequently, deterministic measures for the frequency content of the ground acceleration are also developed. These measures are then used for identifying resonance and criticality in stochastic earthquake models and 110 acceleration records measured at rock, stiff, medium and soft soil sites. The unfavorable earthquake record for a given structure is defined as the record having a narrow frequency content and dominant frequency close to the structure fundamental natural frequency. Accordingly, the measures developed in this study may provide a basis for selecting records that are capable of producing the highest structural response. Numerical verifications are provided on damage caused to structures by identified resonant records.     

1960-1970年代美国“红种人权力”运动与土著族裔意识的复兴

"红种人权力"运动作为美国印第安人历史上的重大事件之一,并非仅具有象征性作用,而是产生了重大影响,推动印第安人族裔意识的勃兴.这主要表现在三个方面:一是推动印第安人在1960-1970年代广泛开展泛印第安人抗议运动;二是全国性土著组织如雨后春笋般纷纷建立;三是激发了印第安人个体的族裔认同感和民族自豪感.所有这些又进一步促使土著民族自治运动以星火燎原之势在全国范围内迅速展开.     

包头供电局治理外力破坏对策研究

分析历年来包头供电局近年在预防输电线路外力破坏过程中存在的输电线路遭受外力破坏的几种类型及原因,总结防范输电线路的相关经验,提出有效防治的措施。     

Three-dimensional kinematic analysis of the snatch of elite Greek weightlifters

We investigated the linear kinematics and the change in energy of the barbell and the angular kinematics of the trunk and leg during the snatch technique of 12 elite male Greek weightlifters under competitive conditions after the new weight classification. Two S-VHS cameras operating at 60 Hz were used to record the lifts. The spatial coordinates of selected points were calculated using the direct linear transformation procedure; after digital filtering of the raw data, the angular displacements and angular velocities were calculated for the hip, knee and ankle joints. The following variables were also calculated for the barbell: vertical and horizontal displacement, vertical linear velocity and acceleration, external mechanical work and power output. The results revealed that all weightlifters flexed their knees during the transition phase, independently of their weight category. This indicates that the athletes use the elastic energy produced during the stretch–shortening cycle to enhance their performance. In nine athletes, we found that the barbell trajectory did not cross a vertical reference line that passed through the initial position of the barbell. The vertical linear velocity of the barbell was increased continuously from the beginning of the movement until the second maximum extension of the knee joint, with no notable dip being observed. Regarding the change in energy of the barbell, we found that the mechanical work for the vertical displacement of the barbell in the first pull was significantly greater than the mechanical work in the second pull. In contrast, the estimated average mechanical power output of the athletes during the vertical displacement of the barbell was significantly greater in the second pull than in the first pull. We conclude that the major elements of the snatch technique of elite Greek weightlifters have not been aff ected by the new weight classification.     

基于dijkstra算法的农网路径优化

在线路设计中路径的选择极甚为关键的环节,它会严重影响工程的总造价和运行的稳定性。根据送电线路路径选择上的一些特点,建立在全局基础上最优的路径搜索模型,并且把地质情况、水文状况和林带等影响线路的路径选择的因素统统包括在内,最后运用dijkstra算法在模型上进行最优路径搜索。仿真结果说明,dijkstra算法可以正确地计算出全局最优路径。     

机械动力设备检修管理的思考

为提高设备检修效率,减少检修成本,提高检修质量,对当前本单位机械动力设备检修存在的问题,从设备检修管理、安全效益角度出发,做一个系统的反思,并探究设备检修管理的理念及方式方法,采取多种措施切实提高检修管理水平和检修质量。     

山东省科技创新投入产出分析及对策

本文对山东省科技创新资源投入和产出的现状以及近年来尤其是2006年以来的发展变化趋势进行了分析研究,并与广东、江苏和浙江三省以及全国平均水平进行对比研究,明确山东省在科技创新投入产出方面存在的优势、劣势和需要解决的问题,分析创新驱动对科技的需求,在此基础上提出提高山东省创新投入和产出应采取的对策措施。     

体育博物馆在体育文化传播与传承中的正能量探析

为适应当前我国文化体制改革以及整个社会大文化的发展需求,对推动传播和传承优秀的体育文化。利用文献资料法,专家访谈法等分析出体育博物馆作为体育文化传播与传承的重要阵地。主要目的是为了发展体育文化事业、建设和完善是满足人们物质需求和精神需求的需要。提出增加体育博物馆数量、提高体育博物馆质量和体育名人堂建设等建议,旨在使体育博物馆真正起到传播与传承体育文化的阵地的作用。     

农村配电网节能措施探索与效果分析

本文针对农村配电网的现状,阐述了农村10KV配电网的节能降损措施,并对每项措施进行了深入研究,最后对无功补偿的节能效果进行了分析。