中国诸葛菜属(十字花科)新分类群   总被引：4，自引：0，他引：4  

谭仲明  许介眉  赵炳祥  张小亮 《中国科学院研究生院学报》1998,36(6):544-548

  相似文献   

沙田柚果实贮藏期水分变化与枯水的关系     

刁俊明 《嘉应学院学报》1999,17(3):83-87

沙田柚采后经预贮10d贮藏于常温室内.用~3H_2O对标记定期测定果蒂部、果皮、果肉(汁胞)的放射性比活度和果实的失重率、果汁率、不同组织含水量、呼吸速率及营养物质含量变化,结果表明,沙田柚贮藏期间,果瓣之间、果肉和果皮之间水分是相互流动的.果实枯水时,水分从果肉到果皮的转移速度大于正常果.沙田柚果实枯水的原因可能是果肉营养物质消耗和果皮组织相对再生长同步进行.  相似文献   

R_2O、SO_3对回转窑硅酸盐水泥熟料煅烧和质量的影响     

舒宜方  段联合  蔡世斌 《荆门职业技术学院学报》1999,(6)

本文论述了SO3、R2O挥发性微组合化合物对水泥回转窑及窑尾预分解工艺系统结皮的影响,探讨了消除窑后结圈的措施,论述了R2O、SO3微组合化合物对回转窑内生料易烧性,以及对熟料强度、凝结时间、安定性、水化热、需水量的不利影响,并提出相应对策措施．  相似文献   

O_2max速度的不同间歇训练对运动员有氧能力和3000m跑成绩的影响     

朱小烽  刘无逸 《中国体育科技》2010,(4)

最大耗氧量速度(vV.O2max)作为中长跑训练的一个强度指标可以有效地用来制定中长跑间歇训练和持续训练的训练计划和评定日常的训练效果。研究目的:通过4周vV.O2max强度的间歇训练和持续跑训练的实效性研究,首先是验证高强度的间歇训练对于提高受试者的有氧耐力方面是否优于持续跑训练;其次来评价高强度的间歇训练跑30/15组与15/15组在4周训练后对提高运动员有氧耐力和3000m跑成绩的效果优劣。研究方法:男性田径运动员18名,随机分成3组:1)40min70%v.VO2max持续跑训练组(A组);2)间歇跑15/15训练组(B组);3)间歇跑30/15训练组(C组)。训练前、后测试指标:vV.O2max、V.O2max、3000m成绩测定。研究结果:1).VO2max:间歇跑组(B组和C组)训练前、后均有显著性升高(P<0.05;P<0.01);A组训练前后无统计学意义的变化。2)vV.O2max:间歇跑组训练前后均有非常显著性的的提高(P<0.01),而A组训练前后无显著性差异。4)3000m跑成绩:C组训练前后有非常显著性的升高(P<0.01),A组和B组均有显著性升高(P<0.05)。结论:用vV.O...  相似文献   

Academic inventors as brokers   总被引：4，自引：0，他引：4  

Francesco Lissoni 《Research Policy》2010,39(7):843-857

Academic inventors are university scientists who appear as designated inventors of patents owned either by business companies, academic institutions or individuals. We analyse their relationships with co-inventors, who may be either academic colleagues, students, or, very often, industrial researchers. Gould and Fernandez's (1989) taxonomy of ‘brokerage’ roles is adjusted to patent data, and complemented with information drawn from both academic inventors’ publications and replies to a short questionnaire. Only very few academic inventors are found to hold brokerage positions. Such inventors have a large number of patents, a strong publication record and a higher-than-average share of patents held by companies, rather than universities. Relationships of academic inventors with co-inventors from industry are weaker and less likely to be maintained than those with co-inventors from academia. Academic inventors in gatekeeping positions (between university and industry) maintain the strongest ties with all types of co-inventors.  相似文献   

Cooperation in innovation activities: The importance of partners   总被引：1，自引：0，他引：1  

Pedro de Faria  Francisco Lima 《Research Policy》2010,39(8):1082-1092

This paper analyses the importance of cooperation partners for the development of innovation activities. We contribute to the literature on cooperation in innovation activities that seeks to identify the characteristics differentiating cooperative from non-cooperative firms by proposing a different approach to this problem. We distinguish firms according to their evaluation of cooperation partners in the development of innovation activities. We apply a probit selection model to account for the firm's decision to cooperate (or not). The data we use come from the Portuguese Third Community Innovation Survey. Our estimation results show that firms from high-technological industries, with higher levels of absorptive capacity and of innovation investment, who give importance to incoming spillovers management, and who cooperate with firms from the same group or with suppliers, place greater value on cooperation partners in the innovation process. Additionally, we also find that the factors influencing the importance attributed to cooperation activities are different from the ones behind the decision to cooperate.  相似文献   

Performance of Spanish universities in technology transfer: An empirical analysis     

Aida Caldera  Olivier Debande 《Research Policy》2010,39(9):1160-12407

This paper investigates the performance of universities in the transfer of technology using a unique university-level dataset for Spain. The results suggest that universities with established policies and procedures for the management of technology transfer perform better. Universities with large and experienced technology transfer offices (TTOs) generate higher volumes of contract research, but the TTO characteristics appear to matter less for university performance in terms of licensing and creation of spin-offs. Furthermore, universities with a science park perform better than those without, which suggests that the agglomeration of knowledge close to universities has a positive effect on universities’ technology transfer performance.  相似文献   

Openness and innovation—Home and export demand effects on manufacturing innovation: Panel data evidence for Ireland and Switzerland     

Martin Woerter  Stephen Roper 《Research Policy》2010,39(1):155-164

Recent studies in the tradition of Schmookler have re-emphasised the potential role of demand in stimulating innovation. Here, we reconsider the role of ‘home’ and ‘export’ market demand in stimulating manufacturing innovation using comparable panel data for two small open economies - Ireland and Switzerland. Our analysis is based on the estimation of reduced form innovation production functions using panel data estimators over the sample period 1994-2005. For a range of innovation indicators, however, we find little evidence of any significant market demand effects, with innovation performance instead determined largely by firm-level capability effects and characteristics. In policy and strategy terms this suggests the continued value of measures to improve innovation capability regardless of market demand conditions. In more methodological terms our results suggest the validity of the usual assumption implicit in modelling innovation outputs that supply-side factors predominate.  相似文献   

The determinants of regional innovation in Europe: A combined factorial and regression knowledge production function approach   总被引：3，自引：0，他引：3  

Mikel Buesa  Thomas Baumert 《Research Policy》2010,39(6):722-735

The present paper studies the determinants of regional innovation in Europe through a knowledge production function approach that combines factorial analysis and regression. Our dependent variable are the patents while we used initially 21 explanatory variables that were converted—by a factor analysis—into five non-observable “hypothetical” variables reflecting five important aspects of the innovation systems: the National environment, the Regional environment, Innovating firms, Universities and the R&D done by Public Administration. Our results show that all factors have a statistically significant effect on the production of knowledge (patents), although they present very different impacts.  相似文献   

Knowledge protection strategies of multinational firms—A cross-country comparison     

Pedro de Faria  Wolfgang Sofka 《Research Policy》2010,39(7):956-968

International knowledge spillovers, especially through multinational companies (MNCs), have recently been a major topic of discussion among academics and practitioners. Most research in this field focuses on knowledge sharing activities of MNC subsidiaries. Relatively little is known about their capabilities for protecting valuable knowledge from spilling over to host country competitors. We extend this stream of research by investigating both formal protection strategies (e.g. patenting) as well as strategic ones (secrecy, lead time, complex design). We conceptualize the breadth of firm's knowledge protection strategies and relate it to the particular situation of MNC subsidiaries. Moreover, we argue that their approaches differ with regard to host country challenges and opportunities. We address these issues empirically, based on a harmonized survey of innovation activities of more than 1800 firms located in Portugal and Germany. We find evidence that MNCs prefer broader sets of knowledge protection strategies in a host country with fewer opportunities for knowledge sourcing (Portugal). In Germany, though, they opt for narrower sets of knowledge protection strategies if they invest in innovation activities themselves. We deduce that these results are due to a need for reciprocity in knowledge exchanges to benefit fully from promising host country knowledge flows.  相似文献