碳达峰目标下中国绿色建造技术驱动因素的作用机制：基于系统动力学仿真分析     

孙国帅  姜德龙  冯娇  陈行行 《科技管理研究》2022,(14)

绿色建造技术的推广与应用是促进建筑业持续健康发展的根本路径之一,为有效解决目前我国绿色建造技术推广与应用遇到的障碍,在研究国内外相关主要研究成果的基础上,总结归纳影响绿色建造技术发展的因素,并从市场、经济、生态以及社会参与度等角度得到关键驱动因素,据此构建系统动力学仿真模型,对有关驱动因素进行灵敏度的动态分析并观察各主要因素的影响效果,得到碳达峰目标下我国绿色建造技术驱动因素的作用机制。结果表明：各驱动因素对我国绿色建造技术的推广与应用具有正向的促进作用,但影响程度不同,技术研发程度、政策法律完善程度、绿色建造管理模式、节水节地技术效率对成本影响明显,而对生态价值和生产力效率影响不同。根据研究结论,从绿色建造政策法规、技术研发、管理模式和技术效率等方面提出相关对策建议。  相似文献   

基于CAS理论我国生物医药产业创新集群演化动力机制研究     

李洁  葛燕飞  高丽娜 《科技管理研究》2022,(3)

研究我国生物医药产业创新集群演化动力机制,为促进我国生物医药产业创新能力提升提供决策依据。运用复杂适应系统理论模型,分析生物医药创新集群的聚集、非线性、流、多样性特征与标识机制、内部模型机制和积木机制。在此基础上建立生物医药创新集群演化机制的回声模型,运用不完全信息下的重复静态博弈分析主体互动作用,并运用涌现模型分析系统涌现机制。生物医药产业创新集群是复杂适应系统,具备其所有特征;创新集群主体通过流空间网络实现交互学习并适应性调整自身行为;通过交互学习,创新集群主体产生了与其他主体合作创新的可能性,但是否真正实现合作创新取决于主体间竞争合作博弈的结果;涌现推动生物医药产业创新集群演化发展。涌现包括知识涌现和创新网络的涌现,通过涌现创新集群产生新的更优的系统功能和结构,可实现生物医药产业创新集群的可持续发展。  相似文献   

基于因子分析和聚类分析的技术创新能力研究——以陕西省为例     

李文琴  王佳  李玲 《技术与创新管理》2014,(2):103-108

技术创新是推动科技进步和经济增长的决定性因素。首先,在文献分析的基础上,利用我国不同地区技术创新的实际数据,本文通过构建包含21项指标的区域技术创新能力体系,对我国31个省市的2011年的数据进行因子分析。进一步地,对陕西与我国其他省市的技术创新能力进行了横向比较。文章的结论对陕西区域技术创新能力的提升,和相关经济发展政策和建议提供理论依据。  相似文献   

黑龙江省雪上项目运动员发展现状研究     

朱红  朱宝峰  齐骥  张新明  高盈  董欣  冮学功 《哈尔滨体育学院学报》2014,32(5):30-33

本文采用文献资料、数理统计、调查等研究方法,以黑龙江省雪上项目注册运动员为研究对象,对雪上项目不同年度注册运动员发展状况进行研究.研究结果发现,越野滑雪、高山滑雪继续保持运动员数量上的优势;单板滑雪成为黑龙江省雪上项目的新亮点.年龄结构分析得知,雪上项目运动员的最佳训练阶段为15～18岁之间;黑龙江省雪上项目队伍梯队建设还不合理,高山滑雪运动员梯队比例形成“U”字形现象;单板滑雪和自由式滑雪项目二线运动员不足,形成了人才梯队培养体系的断裂.  相似文献   

Lower extremity power during the squat jump with various barbell loads     

Daniel Jandacka  Jaroslav Uchytil  Roman Farana  David Zahradnik  Joseph Hamill 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(1):75-86

The purpose of this study was twofold: (1) to determine the barbell load that maximised the system power as well as the ankle, knee, and hip joint powers during the squat jump, and (2) to compare the system powers computed from two different methods: the centre of mass (COM) method and the barbell method. Seven male throwers were recruited in this study. The system power (COM method) and the ankle, knee, and hip joint powers were determined with the load incrementally set at 0%, 10%, 30%, 50%, 70%, and 90% of one repetition maximum. The largest system power was observed at the load of 30% (p < 0.008) while the largest ankle and knee powers were observed at 70% and 0% (p < 0.05). The barbell method overestimated the system power (p < 0.001) when compared to the COM method. It was concluded that the barbell method could influence load optimisation in squat jump. The optimal barbell load which maximised the system power did not maximise the ankle, knee, or hip power simultaneously.  相似文献   

Unsteady flow phenomena in human undulatory swimming: a numerical approach     

Steffen Pacholak  Stefan Hochstein  Alexander Rudert  Christoph Brücker 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(2):176-194

The undulatory underwater sequence is one of the most important phases in competitive swimming. An understanding of the recurrent vortex dynamics around the human body and their generation could therefore be used to improve swimming techniques. In order to produce a dynamic model, we applied human joint kinematics to three-dimensional (3D) body scans of a female swimmer. The flow around this dynamic model was then calculated using computational fluid dynamics with the aid of moving 3D meshes. Evaluation of the numerical results delivered by the various motion cycles identified characteristic vortex structures for each of the cycles, which exhibited increasing intensity and drag influence. At maximum thrust, drag forces appear to be 12 times higher than those of a passive gliding swimmer. As far as we know, this is the first disclosure of vortex rings merging into vortex tubes in the wake after vortex recapturing. All unsteady structures were visualized using a modified Q-criterion also incorporated into our methods. At the very least, our approach is likely to be suited to further studies examining swimmers engaging in undulatory swimming during training or competition.  相似文献   

Comparison of support leg kinetics between side-step and cross-step cutting techniques     

Yuta Suzuki  Michiyoshi Ae  Shunsuke Takenaka  Norihisa Fujii 《Sports biomechanics / International Society of Biomechanics in Sports》2014,13(2):144-153

The purpose of this study was to investigate differences in the support leg joint moment and moment power between side-step (SS) and cross-step (CS) cutting techniques with a prescribed 90° cutting angle. Ground reaction forces (1,000 Hz) and three-dimensional kinematics (250 Hz) of SS and CS cutting techniques were collected from 20 male college athletes. Normalised peak knee extension moment was larger in the SS technique than in the CS technique (0.40 ± 0.10 in SS; 0.26 ± 0.08 in CS). In the SS technique, the knee extensors ( ? 0.10 ± 0.06 in SS; ? 0.02 ± 0.04 in CS) and ankle plantarflexors ( ? 0.12 ± 0.05 in SS; ? 0.07 ± 0.03 in CS) did significantly more negative work (normalised). The direction change angle (40.5 ± 8.7° in SS; 33.0 ± 6.8° in CS) and the decrease in horizontal velocity of the centre of mass ( ? 0.63 ± 0.23 m/s in SS; ? 0.31 ± 0.23 m/s in CS) were significantly larger in the SS technique. These results suggest that the SS technique is an effective means of changing running direction at the expense of velocity of the centre of mass and that the CS technique is better for minimising the reduction in horizontal velocity of the centre of mass.  相似文献   

传统体育文化对和谐社会构建的价值研究     

余晓慧 《体育科技》2014,(1):11-12,15

传统体育文化是中华传统文化的组成部分,它历史悠久、内容博大精深,其追求礼仁、顺其自然、守中为常、尚贤尚力等内涵,对建立民主法治、公平正义、诚信友爱、安定有序、人与自然和谐相处的和谐社会有不少的启示。儒、道、墨三家,是中华传统体育文化的主体,其对和谐社会的构建有独特而重要的价值和作用。  相似文献   

Computational fluid dynamics (CFD) modeling of microclimate for salts crystallization control and artworks conservation     

《Journal of Cultural Heritage》2014,15(4):448-457

Many deterioration processes are linked to unsuitable microclimatic condition in cultural buildings. One of the most diffused processes is soluble salts crystallization that can be accelerated in masonry structures within specific microclimatic values for different chemical compounds. In this paper, microclimate and efflorescence diffusion were monitored over a one-year period in the Crypt of the Cathedral of Lecce (South Italy). This allowed to relate the microclimate with the efflorescence variation over time. A three-dimensional computational fluid dynamics (CFD) model was then developed to detail the thermo-hygrometric parameters and airflow patterns responsible for salts crystallization and artworks deterioration. Two main conditions were reproduced; one to simulate the current microclimate, which simulations showed to be inadequate for conservation, and the other to search for a more appropriate solution. In both cases, summer and winter conditions were simulated and compared to find a microclimate able to ensure more suitable thermo-hygrometric intervals required by the constituting artworks materials. The results helped to suggest actions to improve maintenance of the Crypt.  相似文献   

城市建设系统的动力学模型研究   总被引：2，自引：0，他引：2  

赵黎明  李振华 《中国软科学》2004,(11):147-151

本文以复杂系统论和系统动力学为指导,从宏观和微观两个角度综合考虑,给出了城市建设系统的动力学模型,以探寻城市建设过程中的基本规律,促进城市建设同社会经济的协调发展和城市建设模式的进一步合理化,为城市建设质量的提高提供支持。  相似文献