中国冰雪运动企业空间格局演化特征及影响因素研究

冰雪运动企业是冰雪运动产业蓬勃发展的重要载体,探究冰雪运动企业空间格局演化特征及影响因素,对于提升冰雪运动普及程度,促进区域冰雪运动产业集聚发展具有重要意义。以中国冰雪运动企业为研究对象,运用最近邻指数、标准差椭圆和核密度分析法,探索2000年、2005年、2010年、2015年和2020年中国冰雪运动企业的空间格局特征及演化趋势,并借助OLS模型解析影响冰雪运动企业空间布局的核心要素。结果表明:中国冰雪运动企业整体空间布局呈现集聚分布,向外扩散趋势不断减弱而集聚态势日益增强;中国冰雪运动企业分布的热点集聚区主要沿着“西南-东北”方向集中在东北地区、京津冀、长三角及珠三角地区,不同时间节点冰雪运动企业呈现不同分布密度;中国冰雪运动企业空间布局的形成是人口规模、经济实力、产业结构、政策支持、固定资产投资、消费需求、交通条件、雪场数量等多种要素综合作用的结果,且不同区位主导因素有所差异。最后,根据实证研究结论,提出相应对策性建议:借势北京冬奥会东风,冰雪运动产业聚焦空间布局、人才培养、政策扶持、产业融合、数字技术,推动产业高质量可持续发展。     

永州市物流业发展现状与模式研究

本文以物流的含义和对物流业范畴的认识为基础,分析永州市物流业发展的现状,并对其发展模式的构建提出政策性建议．     

教育模式要改教育效益更要提

当前正处在由应试教育向素质教育转轨的艰难阶段,素质教育的实施中也出现了不少问题.针对"现在应不应该从应试教育模式向素质教育模式转变?"以及"具体应该如何有效地促使这一转变?"等一系列问题,提出了"教育模式要改,教育效益更要提."     

宽度不等的夫琅和费双缝衍射图样

分析宽度不等的夫琅和费双缝衍射，得出其衍射光强分布图及衍射图样的特点。     

奥运会临时超市网点最佳设计

通过对预演运动会的问卷调查进行统计分析，得出观众在性别、年龄、出行、就餐和购物等方面的规律，又以餐饮为基准，通过横向纵向比较找出了就餐与出行方式、消费额之间的联系，进而测算出20个商区的人流量分布。最后，建立了以成本为目标函数，以观众的购物欲望、商业赢利为约束条件的整数规划模型，对其中的参数N、n、Q、q、λ进行合理估计，给出一组数据，借助MATLAB软件计算出了MS网点的最佳设计方案。     

基金视角下的学科知识流动网络构建与分析

[目的/意义] 在学科交叉融合的背景和趋势下,科研人员的跨学科研究行为促进了知识在不同学科之间的共享与流动。以基金领域为视角,研究学科知识流动,以期为基金管理工作提出建议。[方法/过程] 提出基于基金代码共现的学科知识流动强度测量方法,并利用社会网络分析方法,对193517个国家自然科学基金项目数据构建学科知识流动网络,探究网络的演变过程以及不同学科层次内知识流动路径。[结果/结论] 通过以上分析,得到如下结论:学科知识流动网络是无标度网络,随着时间的推移,网络的规模和结构都发生显著的变化,网络中重要节点呈非稳态;不同学部之间,存在若干条较为重要的知识流动路径;在某一个学部内,具有较广影响力的一类学科往往更容易构成知识流动链条。     

Reliability of arterial spin labelling measurements of perfusion within the quadriceps during steady-state exercise

Arterial spin labelling (ASL) provides a potential method to non-invasively determine muscle blood flow and examine the impact of interventions such as supplementation and training. However, it's a method with intrinsically low signal, leading to limitations in accuracy and temporal resolution. To examine these limitations, the current study measured perfusion via ASL on three occasions in the rectus femoris of 10 healthy adults, during light and moderate exercise, over three different exercise durations. For data sampled over 9 min, light intensity exercise gave an average perfusion of 35.0 ± 5.1 ml/min.100g^?1 with a coefficient of variation (COV) of 16% and single intraclass correlation coefficient (ICC) of 0.67. For the moderate bout, perfusion was 51.3 ± 5.6 ml/min.100g^?1 (COV 10%, ICC 0.82). When the same data were analyzed over 5 min 24 s, perfusion was 37.8 ± 11.13 (COV 30%, ICC 0.13) during light and 49.5 ± 8.8 ml/min.100g^?1 (COV 18%, ICC 0.52) during moderate exercise. When sampling was reduced to 1 min 48 s, perfusion was 41.2 ± 13.7 (COV 33%, ICC 0.26) during light and 49.5 ± 13.6 ml/min.100g^?1 (COV 28%, ICC 0.04) during moderate exercise. For 9 min a significant perfusion difference was found between the exercise intensities; however, this was not the case for sampling over 5 min 24 s or 1 min 48 s. Such findings illustrate the potential of ASL to non-invasively monitor muscle perfusion under steady-state conditions, but highlight that extended exercise protocols are necessary in order to generate date of sufficient reliability to be able to discriminate intervention dependent perfusion differences.     

Neuro-mechanical adjustments to shod versus barefoot treadmill runs in the acute and delayed stretch-shortening cycle recovery phases

In habitually shod recreational runners, we studied the combined influence of footwear and stretch-shortening cycle (SSC) fatigue on treadmill running pattern, paying special attention to neuro-mechanical adjustments in the acute and 2-day delayed recovery periods. The SSC exercise consisted of a series of 25 sub-maximal rebounds on a sledge apparatus repeated until exhaustion. The acute and delayed functional fatigue effects were quantified in a maximal drop jump test. The neuro-mechanical adjustments to fatigue were examined during two submaximal treadmill run tests of 3 min performed either barefoot or with shoes on. Surface electromyographic (EMG) activities, tibial accelerations and kinematics of the right lower limb were recorded during the first and last 15 s of each run. The main result was that neuro-mechanical differences between the shod and barefoot running patterns, classically reported in the absence of fatigue, persisted in the fatigued state. However, in the delayed recovery phase, rearfoot eversion was found to significantly increase in the shod condition. This specific footwear effect is considered as a potential risk factor of overuse injuries in longer runs. Therefore, specific care should be addressed in the delayed recovery phase of SSC fatigue and the use of motion control shoes could be of interest.     

体育非物质文化遗产福建地术拳传承模式与传承路径探析

体育非物质文化遗产是我国传统体育文化的重要组成部分,对体育非物质文化遗产的保护和传承具有重要的意义。本文运用文献资料法、田野调查法对福建地术拳的传承发展的历史、现状及传承模式和传承路径进行梳理和归纳。研究发现福建地术拳并非单纯沿用传统的自然传承模式,而是在近一个世纪的传承过程中逐渐摸索出一条“以政宣武,以商养武,以武助商”的具有自我特色的传承模式和“六进”的传承路径。     

刍议社区教育发展模式之构建

从教育创新和建模的需要出发，用模式的理论审视社区教育的科学运作与科学思维。不难看出，社区教育是全纳教育模式，社区教育是教育与社区双向发展的互动互利模式，能使教育资源在重组建模过程中功能放大，促进终身教育体系和学习型社会的构建。