基于策划的广播新闻作品创优

新闻作品创优是媒体人追求的目标。广播新闻作品选题要重大,要有针对社会意义的新意,有开掘的余地;要精心策划素材,采访到位;要选准报道角度,同时做到细节处理到位,笔头到位;要实现理念、事实与技巧的有机统一,就能创作出好的广播新闻节目,展现时代强音并引起听众的共鸣。     

基于BN方法的建筑施工系统质量绩效测度模型研究

根据结构工程质量形成的一般规律,探索施工系统质量绩效的测度方法,建立包含9个节点要素的贝叶斯网络模型;从铁路建设施工现场收集到数据后进行贝叶斯网络参数学习,获得完整的BN网络;采用两个典型样本数据对模型进行检验,实验结果显示模型具有较好的预测功能;最后对模型进行应用推理和敏感性分析,并给出若干建议。     

基于损失分布的巨灾再保险偿付规模与定价研究

本文从再保险人角度对我国巨灾再保险偿付规模与费率的敏感性进行了研究。为此,引入资产—负债—利率动态模型并根据我国地震、洪水损失分布,采用蒙特卡罗方法对我国巨灾再保险偿付规模与公平定价费率的敏感性进行了实证研究,研究结果表明：提高巨灾再保险的偿付规模,能够降低巨灾再保险公平定价费率,从而得到更适合市场的可行性定价,使投保人更愿意购买巨灾保险;对于市场可接受的费率,我国地震灾害再保险适宜的偿付规模在103亿元量级,而洪水灾害再保险适宜规模在105亿元量级,两者的差异主要是由我国地震、洪水损失分布不同造成的。基于上述实证研究结果并结合我国国情,提出了我国开展巨灾再保险的发展策略与政策建议。     

基于灵敏度矩阵的直接三维ECTLandweber图像重建算法研究

ECT图像重建是一个非线性、欠定的和病态的逆问题。获得一个高质量的重建图像是很困难的,尤其是对于3D重建。图像重建算法的研究在ECT中是一个重要的研究内容。本文对基于灵敏度矩阵的直接三维ECTLandweber图像重建在不同迭代次数,有无门限等情况下进行了研究总结并给出了仿真结果。结果表明：对于landweber迭代算法进行重建时,迭代200次,固定门限为0．03的结果与原型最为接近。     

青少年足球运动员灵敏性结构模型的理论与实证研究简

近十余年来,我国足球运动员灵敏性方面与其他亚洲强队相比差距明显,如何提高灵敏性已经成为足球训练界关注的问题,提高足球运动员的敏捷性对提高足球整体竞技水平具有重要意义。本文运用了文献检索法、数理统计法、实验法等方法。指出足球运动员灵敏性结构模型在动作结构层面表现为“急停一变向一启动”,在力量结构层面表现为“制动力量一反应力量一启动力量”。通过对实验对象进行实验前后的对照,结果证明本研究所提出的足球运动员灵敏性结构模型是准确的,通过发展青少年运动员的制动力量、反应力量、启动力量能够很好的提高其灵敏性。     

Evaluating the Responsiveness of Accelerometry to Detect Change in Physical Activity

The responsiveness to change of the Actical and ActiGraph accelerometers was assessed in children and adolescents. Participants (N = 208) aged 6 to 16 years completed two simulated free-living protocols, one with primarily light-to-moderate physical activity (PA) and one with mostly moderate-to-vigorous PA. Time in sedentary, light, moderate, and vigorous PA was estimated using 8 previously developed cut-points (4 for Actical and 4 for ActiGraph) and 5-sec, 15-sec, and 30-sec epochs. Accelerometer responsiveness for detecting differences in PA between protocols was assessed using standardized response means (SRMs). SRM values ≥.8 represented high responsiveness to change. Both accelerometers showed high responsiveness for all PA intensities (SRMs = 1.2–4.7 for Actical and 1.1–3.3 for ActiGraph). All cut-points and epoch lengths yielded high responsiveness, and choice of cut-points and epoch length had little effect on responsiveness. Thus, both the Actical and ActiGraph can detect change in PA in a simulated free-living setting, irrespective of cut-point selection or epoch length.     

Are the Yo-Yo intermittent recovery test levels 1 and 2 both useful? Reliability,responsiveness and interchangeability in young soccer players

Abstract

The aim of this study was to compare the reliability, internal responsiveness and interchangeability of the Yo-Yo intermittent recovery test level 1 (YY1), level 2 (YY2) and submaximal YY1 (YY1-sub). Twenty-four young soccer players (age 17 ± 1 years; height 177 ± 7 cm; body mass 68 ± 6 kg) completed each test five times within pre- and in-season; distances covered and heart rates (HRs) were measured. Reliability was expressed as typical error of measurement (TEM) and intraclass correlation coefficient (ICC). Internal responsiveness was determined as effect size (ES) and signal-to-noise ratio (ES_TEM). Interchangeability was determined with correlation between training-induced changes. The TEM and ICC for distances in the YY1 and YY2 and for HR in YY1-sub were 7.3% and 0.78, 7.1% and 0.93 and 2.2% and 0.78, respectively. The ESs and ES_TEMs were 0.9 and 1.9 for YY1, 0.4 and 1.2 for YY2 and ?0.3 and ?0.3 for YY1-sub. Correlations between YY1 vs. YY2 and YY1-sub were 0.56 to 0.84 and ?0.36 to ?0.81, respectively. Correlations between change scores in YY1 vs. YY2 were 0.29 and ?0.21 vs. YY1-sub. Peak HR was higher in YY1 vs. YY2. The YY1 and YY2 showed similar reliability; however, they were not interchangeable. The YY1 was more responsive to training compared to YY2 and YY1-sub.     

薄膜材料热物性测量的FDTR信号敏感度比较

基于光热反射技术的原理,采用柱坐标下的傅里叶导热模型,以矩阵传递的形式,推导并计算得出连续型、脉冲型频域光热反射法（FDTR）的理论相位表达式,比较了二者测量2种常见结构的信号敏感度,得到具有不同基底热导率、薄膜热导率、界面热导的薄膜材料的FDTR实验测量方法选择的理论依据. 结果表明,结合最佳拟合频率段的选取,采用合适的FDTR测量方法,可得到更高精度的材料热物性参数测量结果.     

研究与开发(R&D)项目评估方法的一种比较分析

过去,大量文献资料介绍了关于研究与开发(R&D)项目评估的方法,并大多集中在R&D项目评估方法得以建立的最根本的理论基础方面,很少论及方法的有效性和适应性,没有对方法的优劣和应用进行比较分析。在运用层次分析法(AHP)的基础上,对一些主要的R&D项目评估方法进行比较分析,研究了影响这些评估方法有效性的各种因素,并应用敏感性分析法确定出哪些是关键因素。     

游泳训练及联合补充线粒体营养素α-硫辛酸对wistar2型糖尿病大鼠血脂代谢及脂质过氧化水平的影响

目的:观察2型糖尿病(T2DM)模型大鼠,经8周游泳训练后,血脂代谢、血清氧化应激、血糖(FBG)、胰岛素敏感性(ISI)及肝脏组织二相酶活性变化,检测联合作用方式(游泳训练及联合补充α硫辛酸)对wistarT2DM大鼠血脂代谢及脂质过氧化水平的影响,并探讨其内在影响机制。方法:实验材料wistar大鼠60只,造模完成后随机分成4组,对照组(CON);α硫辛酸(LA);游泳运动组(SEX);α硫辛酸+游泳运动组(LA+SEX),每组15只。进行游泳训练共计8周,观察各组大鼠血脂代谢水平、FBG、ISI及肝脏组织二相酶活性变化。结果:经联合作用方式可极显著性降低wistar大鼠血清总胆固醇和甘油三酯水平,降低LDL-C含量和FFA水平,提高HDL-C;在降低FBG,提高ISI作用上存在叠加效应(P<0.01),对胰岛素水平无显著性影响;在改善血清氧化应激水平作用上(降低ROS和提高SOD),存在增强作用(P<0.01);对肝脏组织二相酶的影响,在对谷胱甘肽-S-转移酶(GST)和谷胱甘肽过氧化物酶(GPX)存在增强作用,对醌氧化还原酶1(NQO-1)则无此作用。结论:联合作用方式可以有效降低血清及肝脏脂质过氧化水平,纠正血脂代谢异常,提高ISI。其保护作用可能是通过降低机体氧化应激水平,维持机体血脂正常代谢水平,减少氧化应激而实现。提示,联合作用方式可以为治疗T2DM提供新思路。