生产要素投入对城市土地利用效率的影响——基于不同工业化阶段省级数据     

张雯熹  邹金浪  吴群 《资源科学》2020,42(7):1416-1427

城市土地利用效率是影响城市化进程的重要因素,提升城市土地利用效率对于推动区域协调发展具有重要意义,但是如何差异化提升不同区域城市土地利用效率有待研究。本文首先基于生产要素理论,分析城市生产要素投入对城市土地利用效率的影响机理,其次利用1996—2017年中国30个省（市、区）的数据实证分析资本、劳动力与创新投入对土地利用效率的作用,并探讨不同工业化阶段的差异化影响。主要结论如下：①总样本的回归结果显示,资本投入、劳动力投入以及创新投入对城市土地利用效率产生显著的正向作用。②不同工业化阶段的异质性回归结果显示,在工业化初期阶段,资本与劳动力投入能够显著促进城市土地利用效率的提升;在工业化中期阶段,资本、劳动力与创新投入都能够对城市土地利用效率产生显著的正向影响;在工业化后期阶段,资本投入对城市土地利用效率的影响显著为负,而劳动力和创新投入对城市土地利用效率影响显著为正。研究表明,在不同工业化阶段,影响城市土地利用效率的因素及其作用强度和方向均有差异。因此,为更加集约利用土地,需制定差别化的政策,促进不同工业化阶段城市土地利用效率的提升。  相似文献   

北京市男子大学生足球运动员运动损伤特征与风险因素筛查     

吴放  陈效科 《北京体育大学学报》2017,40(7):56-62

摘要：目的：掌握北京市男子大学生足球运动员运动损伤的流行情况，对导致运动损伤发生的风险因素进行筛查，为进一步预防男子大学生足球运动损伤的发生提供依据。方法：应用方便分层抽样的方法，对参加北京市男子大学生足球联赛甲、乙、丙组的14所高校249名在校大学生足球运动员的损伤情况进行调查，应用T检验、单因素χ2检验与二元非条件logistic回归模型进行分析。结果与结论：充分了解了北京市男子大学生足球运动员的运动损伤现状和特征；筛查出为运动损伤发生的主要的风险因素；错误的技术动作、对手的粗野动作导致损伤发生的主要诱发事件。  相似文献   

从人文视角审视奥林匹克精神的回归     

汪映川  郑国祥 《体育科技文献通报》2008,16(9):104-105

奥林匹克运动从其诞生地到其发展的历程，处处散发着浓厚的“人文”气息，但受种种社会因素的影响，一些精髓遭到异化和磨灭。本文主要从奥林匹克运动自然属性、奥林匹克“人性”、奥林匹克精神教育价值三个方面来呼吁人文精神的回归。  相似文献   

节能环保产业发展的金融支持研究——基于上市公司数据的实证分析     

董冰洁  周培红  买思怡  张君 《科技管理研究》2015,(3):34-38

首先运用因子分析法对我国68家节能环保上市公司进行综合评价,其次选取金融规模、金融结构和金融效率等影响因素对其评价结果进行实证计量分析。研究发现:(1)金融规模、金融结构和金融效率对节能环保产业发展都具有正向影响;(2)金融规模对产业发展的正向影响较小,而金融结构与金融效率对产业发展的正向影响十分显著。因此,应在产业发展过程中注重金融结构的优化与金融效率的提高。  相似文献   

基于SOR-LS-SVM的公路旅游客流量组合预测模型     

陈丽  张朝元 《科技通报》2015,(1)

基于指数平滑、多元线性回归、灰色系统等目前常见的预测方法建立超松弛改进的最小二乘支持向量机算法的公路旅游客流量组合预测模型。通过实例验证和比较,展示了基于超松弛最小二乘支持向量机算法的公路交通旅游客流量组合预测模型具有较好的预测效果和较高的应用价值。  相似文献   

Analysis of Financial Literacy Level of Retail Individual Investors of Gujarat State and Its Effect on Investment Decision     

Harsha Vijaykumar Jariwala 《Journal of Business & Finance Librarianship》2015,20(1-2):133-158

This study attempts to assess the financial literacy level of retail individual investors in the state of Gujarat, India and its effect on their investment decision. The data collection instrument consisted of a performance test and questionnaire. The performance test was used to measure the financial literacy level of investors. The median percentage of correct answer of the sample was considered to frame the financial literacy level. Forty-four variables of investment decision were studied. Out of a total of 385 respondents, 39.20% of the respondents are considered investors with a higher level of financial literacy and 60.80% of respondents are considered investors with a relatively lower level of financial literacy. This study found that financial literacy does have a statistically significant effect on the investment decision of investors.  相似文献   

Effectiveness during ball screens in elite basketball games     

Miguel-Ángel Gómez  Otavio Battaglia  Alberto Lorenzo  Jorge Lorenzo  Sergio Jiménez  Jaime Sampaio 《Journal of sports sciences》2015,33(17):1844-1852

Ball screens are one of the most frequently used tactical behaviour in elite basketball games. The aim of the present study was to identify their predictors of success related to time, space, players, and tasks performed. The sample was composed of 818 ball screens corresponding to 20 close games (mean differences in score of 3.1 ± 0.8 points) randomly selected from the playoff games of the Spanish Basketball League (2008–2011). Classification tree analysis (CHAID) was used to analyse which variable or combination of variables, better predicts effectiveness during ball screens. The main results allowed identifying interactions with dribbler actions after the screen and the orientation of the screen on the ball. The results showed no interaction with game quarter and quarter minute temporal-related variables in both analyses. The present findings allow improving coaches’ strategic plans that involve selecting the most appropriate offensive approach when performing ball screens.  相似文献   

Informing in-season tactical periodisation in team sport: development of a match difficulty index for Super Rugby     

Samuel J. Robertson  David G. Joyce 《Journal of sports sciences》2015,33(1):99-107

In team sports, tactical periodisation refers to the planned manipulation of training loads with the aim of prioritising athlete readiness for matches of greatest importance. Although monitoring of athletes’ physical condition is often used to inform this planning, the direct influence of external factors on match difficulty has not been well quantified. In this study, a ‘match difficulty index’ (MDI) for use in Super Rugby was developed, based on the influence imparted by five external factors on previous match outcomes. Specifically, information relating to match location, days break between matches, time-zone change and opposition ladder position (both current and previous year) were collected for matches played during the 2011–2013 Super Rugby seasons. Logistic regression analyses were used to assess the importance of each of these factors with respect to match outcome (win/loss), with opposition ladder position and match location (home, domestic away or international) exerting the greatest influence on match difficulty. Three separate cross-validated models were constructed, with match outcome classification performance reported as 66.2%, 65.5% and 63.7% respectively. The three MDI models emanating from this study can each be used to inform tactical periodisation program design both prior to and during the regular season.  相似文献   

2010年世界男子锦标赛前16名球队名次排名的回归分析     

刘毅 《时代教育》2011,(5)

本文对2010年世界男子篮球锦标赛前16名球队的11项技战术指标进行统计,运用逐步回归分析法和秩相关分析法对所得数据进行分析和检验.结果表明:运用逐步回归分析法对2010年世界男子篮球锦标赛前16名球队的名次排名情况分析具有较高可靠性,能够客观反映出2010年世界男子篮球锦标赛前16名球队的名次排名情况;影响2010年世界男子篮球锦标赛前16名球队名次排名情况的最主要因素是得分和防守篮板两项技术指标;2010年世界男子篮球锦标赛前16名球队可以根据数据分析进行有针对性的技术训练,从而提高球队的名次.  相似文献   

安徽省服务贸易的影响因素检验:1995-2013     

万红先  王利平 《安徽广播电视大学学报》2015,(1):19-25

基于安徽省1995－2013年的年度数据,首先采用主成分分析法从选取的多维变量中得到代表变量信息的主要因素,以消除解释变量间的多重共线性。其次通过回归分析法对影响安徽省服务贸易的因素进行实证分析。结果显示：安徽省人均GDP、安徽省货物贸易进出口额、安徽省实际利用外资金额、人力资本、安徽省服务贸易开放度、安徽省居民消费价格指数、安徽省城市化水平和汇率均与服务贸易额呈正相关。并在此基础上提出发展安徽省服务贸易的对策建议。  相似文献