我国数字化专业科技期刊集群的形成与发展   总被引：1，自引：0，他引：1  

李红 《编辑学报》2015,27(4):323-326

探讨我国数字化专业科技期刊集群这一新兴出版模式的形成与发展.基于集群理论界定我国数字化专业科技期刊集群的概念,梳理我国数字化专业科技期刊集群的现实格局.从基本因素和扩展因素2个层面阐释其集聚动因,从组织结构、形成动力和群内关系上归纳其集聚模式.对其未来发展方向做了展望.  相似文献   

Effects of changing speed on knee and ankle joint load during walking and running     

Ana Cristina de David  Felipe Pivetta Carpes  Darren Stefanyshyn 《Journal of sports sciences》2015,33(4):391-397

Joint moments can be used as an indicator of joint loading and have potential application for sports performance and injury prevention. The effects of changing walking and running speeds on joint moments for the different planes of motion still are debatable. Here, we compared knee and ankle moments during walking and running at different speeds. Data were collected from 11 recreational male runners to determine knee and ankle joint moments during different conditions. Conditions include walking at a comfortable speed (self-selected pacing), fast walking (fastest speed possible), slow running (speed corresponding to 30% slower than running) and running (at 4 m · s^?1 ± 10%). A different joint moment pattern was observed between walking and running. We observed a general increase in joint load for sagittal and frontal planes as speed increased, while the effects of speed were not clear in the transverse plane moments. Although differences tend to be more pronounced when gait changed from walking to running, the peak moments, in general, increased when speed increased from comfortable walking to fast walking and from slow running to running mainly in the sagittal and frontal planes. Knee flexion moment was higher in walking than in running due to larger knee extension. Results suggest caution when recommending walking over running in an attempt to reduce knee joint loading. The different effects of speed increments during walking and running should be considered with regard to the prevention of injuries and for rehabilitation purposes.  相似文献   

Intentional thought dynamics during exercise performed until volitional exhaustion     

Natàlia Balagué  Robert Hristovski  Sergi Garcia  Daniel Aragonés  Selen Razon  Gershon Tenenbaum 《Journal of sports sciences》2015,33(1):48-57

Using a non-linear approach, intentional dynamics of thoughts were examined during constant cycling performed until volitional exhaustion. Participants (n = 12) completed two sessions at 80% W_max. Their (1) intrinsic thought dynamics (i.e., no-imposed thoughts condition) and (2) intentional thought dynamics (i.e., imposed task-unrelated thoughts condition; TUT) were recorded and then classified into four categories: internal and external TUT (TUT-I, TUT-E) and external and internal task-related thoughts (TRT-E, TRT-I). The probability estimates for maintaining each thought category stable, the rate of switching from one category to another, and the entropy dynamics along the testing procedure were assessed and compared through time phase. Friedman ANOVA tests revealed a significant effect of effort increase on thought contents only in the imposed TUT test. While TUT-I probabilities decreased significantly (P < .001) as effort increased, TRT-I probabilities increased (P < .05). Moreover, the entropy to the entire thought dynamics increased at the outset of task performance and decreased upon approaching volitional exhaustion (P < .001). As time spent in constant effort increased, and volitional exhaustion approached, task relatedness (TUT, TRT), direction (internal, external), and entropy of thought contents changed unintentionally providing further evidence for a nonlinear dynamics of attention focus.  相似文献   

分子动力学方法研究环氧树脂力学性能参数     

辛东嵘 《福建工程学院学报》2015,(1):28-30

采用分子动力学方法,计算交联度92%的环氧树脂的力学性能参数,并比较不同温度下,环氧树脂力学性能参数的改变。研究结果表明,分子动力学模拟结果与试验结果相吻合。模拟结果显示,随着温度升高,交联环氧树脂的弹性模量、剪切模量和体积模量等性能下降,温度高于玻璃温度之后,环氧树脂力学性能下降显著。  相似文献   

中德两国职业教育师资队伍建设的比较研究与启示     

吕颖 《天津职业院校联合学报》2011,13(9):23-26

德国职业教育教师的选拔、培养、任用、考核和培训方面已形成了自己独特的模式。文章在对中德两国职业教育师资队伍建设进行比较研究的基础上,结合我国航海高职教育的师资特点,提出了我国航海高职教育师资队伍建设的几点建议。  相似文献   

全球化时代OECD国家高等教育扩张的社会动力研究——教育需求的视角     

姜尔林 《教育与经济》2015,(2):51-56

20世纪90年代以来,随着全球化进程的加速,OECD国家失业率居高不下、低质量就业日渐增多、收入分配调节弱化。在此背景下,高等教育对个体的重要性不断增强,接受高等教育可能预示着更多的就业机会、更高的就业质量、更高的收入水平以及更高的生活质量,这导致了个体高等教育需求的强化。社会上日益增长的教育需求成为驱动高等教育规模扩张的基本动力。  相似文献   

Family dynamics and cochlear implant: a case study / Dinámica familiar e implante coclear: estudio de casos     

José Mª Fernández-Batanero  Gema Blanco 《Infancia y Aprendizaje》2015,38(1):30-66

  相似文献   

Gaming personality and game dynamics in online discussion instructions     

Chih-Hsiung Tu  Cherng-Jyh Yen  Laura Sujo-Montes  Gayle A. Roberts 《Educational Media International》2015,52(3):155-172

Gamification is the use of game mechanics to drive game-like engagements and actions. It applies game mechanics, dynamics and frameworks to promote desired learning behaviours. Positive and effective gamification could enhance learning and engage learners in more social and context-rich decision-making for problem-solving in learning tasks. Effective gamification design should understand the game personalities of learners, social engagement styles, and intrinsic- and extrinsic-motivated user styles initially and evaluate and select appropriate game mechanics, game dynamics, to create ideal gamification instructions. The research question this study investigated is: How will four types of gaming personalities (i.e. Explorer, Socialiser, Killer and Achiever) predict the level of game dynamics in online discussion environments? This study concluded that examining how gaming personalities relate to game dynamics in a gamified online discussion instruction is not sufficient to design effective gamification. It suggests future studies in game instructions should focus on the relationships between game dynamics, gamification contexts, gaming personalities or preferences, dynamic gaming engagement styles, etc.  相似文献   

LNG罐柜在船上装载位置的安全性研究     

赵裕  吕植勇  刘俊雯  昌雪玲  沈继超  陶玮凡 《上海海事大学学报》2021,42(3):36-40

为进一步提高液化天然气(liquefied natural gas,LNG)罐柜内河运输的安全性,研究LNG罐柜在船上装载位置的合理性。根据爆炸产生的火球模型和热辐射模型,考虑人员受到不同程度伤害的概率,建立LNG罐柜爆炸危害的系统动力学模型。利用系统动力学仿真软件Vensim_PLE模拟2个罐柜爆炸,得出结论：爆炸中心的热辐射强度最高,但在距爆炸中心一定距离处人员受到伤害的概率最大。为保证人员安全,船舶罐柜装载区与人员活动区应保持足够的安全距离。  相似文献   

我国冰雪旅游发展的系统动力学仿真研究     

姚文娟 《吉林体育学院学报》2021,(1)

目的:预测分析冰雪旅游业下一阶段的发展潜力,以此来规避风险、降低损失,实现冰雪旅游业发展的最大化效益。方法:利用系统动力学方法,借助Vensim PLE软件,构建我国冰雪旅游发展的系统动力学模型,仿真分析子系统中各影响因素之间的相互作用关系并探究冰雪旅游发展的动力机制。结果:增加潜在旅游者数量、加大宣传力度、加强基础设施建设投入金额、加大投资额度等发展策略均能不同程度地促进冰雪旅游发展;增加潜在旅游者数量、加大投资额度发展策略是实现2022年“三亿人参与冰雪运动”总目标的有力保证;以2022年为时间节点,2020—2022年增加潜在旅游消费者是首选的发展策略;2022年以后加强冰雪旅游投资额度是首选的发展策略。结论:未来冰雪旅游的发展可以通过控制潜在旅游者数量、加大投资额度及其相关因素,有效实现冰雪旅游的可持续发展。  相似文献