Simplexmethod建模研讨

目的 Linear Programming的simplexmethod建模求最优解。方法应用simplexmethod.结果建立了LinearProgramming的数学模型并用simplexmethod求得了最优解.结论因为单纯形表反映了Linear Programming的所有信息,故用simplexmethod可简便地求得最优解.simplexmethod的基本思路是：先将Linear Programming用sim-plexmethod划为标准型,根据问题的标准型,进行初等行变换,将主元素列除主元素化为1外其余的元素均化为0,当基变量值全为非负时,问题就得到了最优解.     

基于道德风险的天使投资最优融资合约研究

摘要：作为创业企业的重要融资方式,天使投资存在显著的信息非对称,由此导致的代理问题对天使投资融资合约产生影响。针对创业企业家的道德风险问题,本文基于委托代理理论构建一个理论模型,研究并求解出天使投资最优融资规模及最优股权分配比例。研究发现：最优融资规模及最优股权分配比例是存在的,且能够有效缓解企业家的道德风险问题;当道德风险问题严重时,最优融资规模及天使投资人的最优股权分配比例均减少;优质的创业项目能够提高融资规模并提升企业家的股权分配比例;创业企业家良好的创业能力与经历,能够提高融资规模但会降低企业家的股权分配比例。由此,本文研究结论较好的解释了国内外天使投资的投资实践,并且为天使投资合约的设计提供理论指导。     

通货膨胀目标制度的多角度分析

本文首先给出了通货膨胀目标制度的定义和核心特征,然后通过和理论上的“最优货币政策制度”、货币政策历史经验、美国货币政策制度的对比,从多方面考察了这种制度的优势和可能存在的不足。这种比较分析能增进我们对通货膨胀目标制度的认识,以更好地为我国货币政策制度建设和政策操作提供借鉴。     

关联理论与非字面话语含义的推导

文章首先对字面话语与非字面话语进行解释,提出听者对两类话语的认知过程是否不同这一问题。通过分析对比格莱斯对于暗喻和夸张的解释,及Sperber和Wilson的关联理论在非字面话语中的实际应用,得出结论字面话语与非字面话语间没有分界点,听者在理解话语的过程中都试图寻找最佳关联。     

文学翻译中汉语独特文化意象英译的最佳关联——《浮躁》英译本个案分析

根据关联翻译理论,以《浮躁》英译本为个案,探讨汉语独特文化意象英译的翻译方法。研究表明,当原文读者的认知语境在译文读者的认知语境中缺失的情况下,译者只要根据上下文语境推导出原文作者的交际意图,通过直译加注、舍去形象意译或者转换形象都可使译文达到最佳关联。     

基于GIS的横断山区地形起伏度与人口和经济的关系

地形起伏度是影响山区人口分布和经济发展的关键因素。以横断山区大尺度ASTER GDEM为数据源,基于GIS的窗口递增分析原理,采用均值变点法科学分析平均地形起伏度的最佳统计面积并对其进行分级和相关性分析,得出实验区最佳分析窗口面积为0。202 5 km²,省域之间地形起伏度差异明显,省内差异不明显,相关性较高。同时,采用空间分析技术、统计学方法以及PCA排序法,分析地形起伏度与人口、经济的关系。研究结果表明：随着地形起伏度的增大,人口密度逐渐降低,当达到3。7以后人口密度趋于一个固定值;地形起伏度与第三产业占GDP比重的负相关性最大,与城镇化率的负相关性较小,与人均GDP的负相关性最小。     

Performing under pressure: Exploring the psychological state underlying clutch performance in sport

Clutch performance is improved performance under pressure. However, little research has examined the psychological state experienced by athletes in these situations. Therefore, this study qualitatively examined the subjective experience underlying clutch performance across a range of sports (e.g., team, individual) and standards (Olympic to recreational athletes). Sixteen athletes (M_age = 27.08 years; SD = 6.48) took part in in-depth, semi-structured interviews primarily after an exceptional performance (M = 4.38 days later; SD = 3.14). Data were analysed inductively and thematically. Clutch states involved 12 characteristics, including heightened and deliberate concentration, intense effort, and heightened awareness, which distinguished the experience of clutch from other optimal psychological states such as flow. Other characteristics, such as perceptions of control, were also reported and supported previous experimental research on clutch. These findings present in-depth qualitative insights into the psychological state underlying clutch performance, and are discussed in relation to the existing literature on optimal psychological states in sport.     

青少年身体活动发展评价模型的构建及其优化治理对策*

充分重视青少年身体健康,提升青少年身体机能素质是当前教育教学部门开展青少年身体活动的核心目标。围绕青少年身体素质的影响要素,构建青少年身体活动发展评价模型,从青少年身体活动发展自我影响要素和外部影响要素入手,分析影响青少年身体活动发展的要素,并在综合评价基础上提出青少年身体活动发展优化治理的对策。     

Power training in elite young soccer players: Effects of using loads above or below the optimum power zone

ABSTRACT

This study aimed to examine the effects of two jump squat (JS) training programs involving different loading ranges in under-20 soccer players during a preseason period. Twenty-three elite young soccer players performed sprint speed (at 5-, 10-, and 20-m), change-of-direction (COD) speed, JS peak-power (PP), and countermovement jump (CMJ) tests pre and post four weeks of training. Athletes were pair-matched in two groups according to their optimum power loads (OPL) as follows: lower than OPL (LOPL; athletes who trained at a load 20% lower than the OPL) and higher than OPL (HOPL; athletes who trained at a load 20% higher than the OPL). Magnitude-based inferences were used to compare pre- and post-training measures. Meaningful increases in the PP JS were observed for both groups. Likely and possible improvements were observed in the 5- and 10-m sprint velocity in the LOPL group. Meanwhile, possible and likely improvements were observed in the CMJ, 5- and 10-m sprint velocity, and COD speed in the HOPL group. Overall, both training schemes induced positive changes in athletic performance. Soccer coaches and sport scientists can implement the JS OPL-based training schemes presented here, either separately or combined, to improve the physical performance of youth soccer players.     

我国青少年足球训练适宜负荷原则的研究

我国青少年足球训练负荷量和负荷强度搭配不合理，训练时间长但强度小，不利于运动员竞技能力的提高；青少年足球训练适宜负荷方面的理论研究水平落后。