陕西省渭河流域耗水研究     

张志远 《杨凌职业技术学院学报》2013,(1):1-4

为强化水资源的严格管理和流域水资源的持续利用,根据实测资料对陕西省渭河流域的水量平衡进行了分析,研究了流域耗水类型、耗水组成及其特点。结果表明,流域各用水部门的耗水水源基本上以地下水为主,其中农村生活比例最大,为75.47%,工业和城镇生活占50%左右;人类利用水资源活动影响了水资源的径流量和水质质量。  相似文献   

北洛河刘家河水文站暴雨洪水特性及洪水遭遇分析     

刘小平 《杨凌职业技术学院学报》2013,(3):26-29,34

刘家河水文站上游是北洛河暴雨的多发地区,刘家河水文站的洪水主要来自吴旗、志丹水文站断面以上占85%,洪水从上游向下游演进时,递增的洪水占到77.5%;吴旗、志丹两个水文站同时涨水的机率较大为80.0%,但两站洪峰遭遇的可能性基本没有,一站洪峰与另一站洪水过程的峰前或峰后叠加的机率为47.5%;刘家河水文站洪水有三种组合方式,干流来水型洪水占35.0%,支流来水型洪水占17.5%,叠加型洪水占47.5%;叠加型来水和干流来水型洪水在刘家河水文站形成大洪水的机率较大。  相似文献   

体育锻炼对大学生身体成分及健康的影响     

刘秀珍  罗蓉 《巢湖师专学报》2013,(6):102-107

为了解系统的体育锻炼对大学生身体成分的影响,采用文献资料法,实验法和统计法对体育专业和非体育专业大学生身体成分进行了分析和研究。结果表明：非体育专业大学生的体脂偏高．体重及去脂体重偏低,身体成分不合理,营养失调严重,男生营养缺乏的情况较多．女生营养过剩导致肥胖的问题非常突出;体育专业大学生的身体成分相对合理,但女生肥胖比例亦不容忽视。说明系统的体育锻炼对于控制适宜的身体成分,减少营养缺乏及肥胖的发生率．促进身体健康具有有益影响。提出加强身体成分与健康的宣传教育,在合理营养的前提下．进行科学的体育锻炼是增强体质,增进健康的的最佳途径。  相似文献   

有色Petri网在web服务组合建模中的应用     

李增 《巢湖师专学报》2013,(6):22-25

以分布、异构、多自治域的互联网环境为背景,提出利用有色Petri网对web服务组合进行建模的方法,给出了web服务组合网的形式化描述和常用结构的图形化表示方法。文中所引用的案例模型可以在CPN—tools中测试．有效的建模是模型分析验证和模型应用的基础。对电子商务和企业应用集成在解决web服务组合问题中具有一定的参考价值。  相似文献   

＂气＂：方东树诗歌批评最重要的审美范畴     

黄振新 《喀什师范学院学报》2013,(5):78-80,85

“气”是方东树诗歌批评最重要的审美范畴。方东树认为诗歌必须有“气”,有气才有生命,才能活;在诗歌章法上,方东树提出“气脉”之说,要求诗歌“气体高浑”,血脉灌输,又要曲折变化,往复顿挫;在诗歌风格上,方东树强调了“气势”,尚刚健之风,反对“气骨轻浮”。  相似文献   

Team diversity as dissimilarity and variety in organizational innovation     

Dong Huo  Kazuyuki Motohashi  Han Gong 《Research Policy》2019,48(6):1564-1572

How team composition exactly influences innovation outcomes remains a complex and unsolved puzzle in the literature on creativity and innovation. Our study differentiates two types of team technology-related diversity—technological dissimilarity and technological variety, and investigates their influences on the impact of an invention created by a team. Analyses of over half million U.S. utility patents in the 1991–2005 period invented by teams reveal that technological variety of team inventors has a positive effect on invention impact, and that technological dissimilarity between team inventors plays both positive and negative roles, eliciting an inverted U-shaped effect. In addition, we find that the positive effect of dissimilarity is significantly reduced after controlling for variety. Theoretical and practical implications of our findings are discussed.  相似文献   

面向动态联盟的制造服务组合全生命周期模型     

任磊  任明仑 《科技管理研究》2019,39(13)

基于多智能制造单元联合的动态服务联盟,是智慧制造云平台实现资源优化配置和网络化协同集成的基本组织形式,也是企业构建复杂制造业务流程、满足消费者个性化需求的主要服务模式。对智慧制造系统架构分析的基础上,提出业务过程导向的网络化动态联盟模型,并分析了不同联盟结构类型。为了构建高效的动态联盟,从时空角度提出基于全生命周期的服务组合框架,强调了任务分解、服务发现与匹配、服务组合与优选、自适应调整4个阶段应关注问题。并从基于协同能力的服务选择方法、制造服务双边匹配决策方法和基于情景感知的服务自适应决策方法三个方面,给出了解决相关科学问题的思路和关键技术。  相似文献   

Physical profiles of elite,sub-elite,regional and age-group netballers     

Marni J. Simpson  David G. Jenkins  Michael D. Leveritt  Vincent G. Kelly 《Journal of sports sciences》2019,37(11):1212-1219

Physical profile data from elite, sub-elite, regional, under 21s (U21), under 19s (U19) and under 17s (U17) (n = 845) players from a state netball association in Australia were analysed. Within season changes were examined for the elite and sub-elite players. Longitudinal changes were examined for the elite across four consecutive netball seasons.

Elite were significantly older (24.3 ± 3.4years), taller (182.4 ± 7.2cm) and heavier (73.42 ± 6.95kg) than other playing levels (p < 0.001, ES 0.49–3.26) and had higher vertical jump (VJ) data compared to all groups (p < 0.001, ES 0.47–0.93). U17’s were significantly faster than elite, sub-elite and U19 players over 5m (p < 0.05, ES 0.36–0.58) while elite were faster over 20m compared to all groups (p < 0.01, ES 0.45–0.72). Elite achieved a greater distance (1350.8m; p < 0.05, ES 0.32–0.50) in the Yo-YoIRT1 compared to the sub-elite, regional, U19 and U17. VJ height significantly increased from the 2014 (51.6 ± 4.8cm) to the 2017 season (59.6 ± 6.3cm) for the elite players (p < 0.01, ES 1.18). Yo-YoIRT1 test scores increased significantly between the pre-season and in-season phases (p < 0.05, ES 0.17).  相似文献   

Technological Study of the Decoration on an Erard Harp from 1818     

Panagiotis Poulopoulos  Marisa Pamplona  Luise Richter  Elke Cwiertnia 《文物保护研究》2020,65(2):86-102

ABSTRACT

Historical pedal harps from the early nineteenth century are highly adorned objects, decorated with various techniques such as polychromy, gilding, decoupage, and gilt composition ornaments. Even though a large number of such instruments are kept in private and public collections, until now their decorative features have not been examined systematically. Moreover, little has been written about the motives behind the choice of various decorative techniques by harp makers. This article presents results from the investigation of a double-action harp made in 1818 by Erard, the leading manufacturer of harps in Regency London, focusing on the technological aspects of its decorative features. Various analytical methods, such as visual examination, microscopy, SEM-EDX, FTIR, and Py-GC-MS, were used to identify the inorganic and organic components in the coating of the harp and to analyse its stratigraphy. Inspection with ultraviolet light revealed details of the original layers and of later additions, while radiography made the internal structure as well as damaged areas and repairs visible. The outcome of this object-based examination was complemented by archival research on the Erard firm, providing new insight into Erard’s production and marketing strategies.  相似文献   

“棒打苍术”的理论依据探讨     

关颖丽  姜红 《通化师范学院学报》2007,28(2):40-41

为探讨传统“棒打苍术”的采收加工方法的理论依据,利用了紫外分光光度法和薄层色谱法分析比较关苍术根茎及其须根的化学成分.结果表明二者所含成分基本相同,建议无须“棒打苍术”,须根可直接入药,为今后进一步研究和开发苍术的药用资源提供依据.  相似文献