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91.
92.
农业用地的面积和分布变化受多种因素的影响。有自然因素也有人文因素,而更直接的影响因素是人类土地利用活动。通过对四子王旗农业用地变化情况研究,结果表明:近十年来四子王旗农业用地面积基本保持不变,占总面积的94.3%。旱地、天然草地和未成林造林地三者变化面积占四子王旗土地变化面积的96.67%。科技进步在农业用地变化中主要表现在大中型机械的使用,其数量的变化是农业用地变化过程的主要驱动力。 相似文献
93.
蔡耿超 《读与写:教育教学刊》2010,7(1):1-2
This essay is intended as a tentative analysis of Emily Dickinson's poem I Am Nobody! Who are you? mainly from the perspective of literary stylistics. By probing into such stylistic aspects of the poem as punctuation,figure of speech and rhythm and rhyme scheme,we may better understand not only the poem itself but also the poetess' mentality. 相似文献
94.
通过文献资料法、信息技术法对2016年国际钻石联赛男子跳远项目的前3名运动员助跑最后四步及步长、起跳技术进行对比分析,探讨运动员之间技术方面存在的差异。结果表明:1)2016国际田径钻石联赛上海站跳远运动员最后四步步长变化不稳定,个别运动员倒数1步步长大于倒数第2步,步长的控制没有达到理想的范围。2)相对来讲,高兴龙助跑节奏较稳定、频率快,踏板准确度高,水平速度发挥充分。3)3名运动员在起跳技术方面高兴龙的起跳技术比较稳定,其他两名运动员在落地和腾空技术上还有较大的提升空间。 相似文献
95.
大学生创业者胜任特征模型建构及其启示 总被引:2,自引:0,他引:2
通过文献检索与分析、发放开放式问卷、访谈,收集调查问卷条目,编制初始调查问卷。预试后,通过对预试问卷及结果进行定量分析,对问卷进行进一步修订,编制成正式调查问卷。在研究过程中,通过统计检验,对研究结果的可靠和可信度进行了全面检验。研究结果表明:大学生创业者的胜任特征包括创业意识、创业精神、心理承受力、自我反省与学习、人脉搭建与维护、商业洞察力六个方面;本研究所编制的大学生自主创业胜任特征调查问卷信效度较高,具有良好的预测力和实用性。 相似文献
96.
Alexis Herbaut Emilie Simoneau-Buessinger Franck Barbier Christophe Gillet Maxime Roux Nils Guéguen 《European Journal of Sport Science》2017,17(10):1261-1269
Compared to traditional tennis shoes, using 0-drop shoes was shown to induce an immediate switch from rear- to forefoot strike pattern to perform an open stance tennis forehand for 30% of children tennis players. The purpose of the study was to examine the long-term effects of a gradual reduction in the shoe drop on the biomechanics of children tennis players performing open stance forehands. Thirty children tennis players participated in 2 laboratory biomechanical test sessions (intermediate: +4 months and final: +8 months) after an inclusion visit where they were randomly assigned to control (CON) or experimental (EXP) group. CON received 12-mm-drop shoes twice, whereas EXP received 8?mm then 4-mm-drop shoes. Strike index indicated that all CON were rearfoot strikers in intermediate and final test sessions. All EXP were rearfoot strikers in intermediate test session, but half the group switched towards a forefoot strike pattern in final test session. This switch resulted in a decreased loading rate of the ground reaction force (?73%, p?=?.005) but increased peak ankle plantarflexors moment (+47%, p?=?.050) and peak ankle power absorption (+107%, p?=?.005) for these participants compared with CON. Biomechanical changes associated with the long-term use of partial minimalist shoes suggest a reduction in heel compressive forces but an increase in Achilles tendon tensile forces. 相似文献
97.
现代教学手段与数学分析课程传统教学的整合 总被引:1,自引:0,他引:1
连颖颖 《安阳师范学院学报》2010,(2):117-119
本文先分析了现代教学手段的优缺点,再阐述了传统教学与现代教学手段整合的目标和原则,最后根据数学分析课程的特点,提出了二者整合的具体方法。 相似文献
98.
Richard C. Thelwell Christopher R. D. Wagstaff Adam Rayner Michael Chapman Jamie Barker 《Journal of sports sciences》2017,35(1):44-55
The present study aimed to extend research that has focused on the identification of stressors associated with coaching practice by systematically evaluating how such stressors effect athletes, and more broadly, the coach–athlete relationship. A total of 13 professional- and national-level athletes were interviewed to address the three study aims: how they detect when a coach is encountering stressors, how coach experiences of stress effects them as an athlete, and how effective the coach is when experiencing stress. Following content analysis, the data suggested athletes were able to detect when a coach was experiencing stress and this was typically via a variety of verbal and behavioural cues. Despite some positive effects of the coach experiencing stress, the majority were negative and varied across a range of personal influences on the athlete, and effects on the general coaching environment. It was also the broad view of the athletes that coaches were less effective when stressed, and this was reflected in performance expectations, perceptions of competence, and lack of awareness. The findings are discussed in relation to the existing theory and with reference to their implications for applied practice, future research, and development of the coach–athlete relationship. 相似文献
99.
Nicholas P. Murray 《Journal of sports sciences》2017,35(3):241-246
Considerable research has documented that successful performance in interceptive tasks (such as return of serve in tennis) is based on the performers’ capability to capture appropriate anticipatory information prior to the flight path of the approaching object. Athletes of higher skill tend to fixate on different locations in the playing environment prior to initiation of a skill than their lesser skilled counterparts. The purpose of this study was to examine visual search behaviour strategies of elite (world ranked) tennis players and non-ranked competitive tennis players (n = 43) utilising cluster analysis. The results of hierarchical (Ward’s method) and nonhierarchical (k means) cluster analyses revealed three different clusters. The clustering method distinguished visual behaviour of high, middle-and low-ranked players. Specifically, high-ranked players demonstrated longer mean fixation duration and lower variation of visual search than middle-and low-ranked players. In conclusion, the results demonstrated that cluster analysis is a useful tool for detecting and analysing the areas of interest for use in experimental analysis of expertise and to distinguish visual search variables among participants’. 相似文献
100.
Miguel-Ángel Gómez Roberto Silva Alberto Lorenzo Rasa Kreivyte Jaime Sampaio 《Journal of sports sciences》2017,35(3):247-254
Substituting basketball players during competition is a key process to optimise collective performance. Available research on this topic is scarce, probably due to the difficulty in isolating these effects; thus, the aim of this study was to identify the temporal effects of substitutions in basketball (Spanish professional basketball league). The sample was composed of 1118 substitutions gathered from 21 basketball games. The analysed variables were coach-controlled (player and team’s personal fouls, player in and player out roles, player’s in and out minutes on-court and timeout situation); on-court (foul committed, free throws, 2- and 3-point field-goal effectiveness) and situational variables (scoreline, quality of opposition, game location and game quarter). The results showed positive scoring performances after the substitution for all the analyses. During the first quarter, there were significant effects for fouls committed, scoreline and game location after the substitution. The player’s out personal fouls, free-throw effectiveness, player in, minutes on-court player in, timeout situation and 3-point field-goal effectiveness were significant during the second quarter. The team’s personal fouls, game location, and scoreline were identified as important in the third quarter. The fourth quarter did not show significant effects on the independent variables. Current findings allow optimising coaches’ plans and team management of on-court and bench players throughout the game. 相似文献