血清心肌肌钙蛋白T(cTnT)在运动性心肌损伤检出中的应用   总被引：1，自引：1，他引：0  

刘凌  范启国  岳峰 《体育与科学》2005,26(5):64-66,71

由于缺乏特异性强的心肌标记物，对运动训练中造成的心肌损伤难以早期诊断，心肌肌钙蛋白T（cTnT）作为新的心肌标记物，为运动所致的心肌损伤提供了新的监测手段。通过对运动员大量周训练中血清cTnT浓度变化的检测，我们明确检测到运动性心肌损伤的存在，并对该损伤进行评价。方法：选取划艇队员17名，分为一线组和非一线组，观察两组队员在经过大周期训练中的两个最大量周训练中的血清cTnT和CK浓度变化，结合大周期训练中摄氧量变化，对其心脏机能进行评定。结果：在cTnT、CK血清浓度变化上，各组队员血清cTnT含量均属适度增长范围，各组的cTnT、CK两者之间存在相同的变化趋势。一线组队员cTnT、CK血清浓度在第一个大量周升高，第二个大量周下降（P〈0．01）而非一线组队员两周内cTnT和CK血清浓度呈上升趋势（P〈0．01）。在摄氧量多个方面，一线组训练前后有显著性变化（P〈0．05或P〈0．01或P〈0、001），心肺机能得到发展，非一线组队员摄氧量各方面变化不明显。结论：在大运动量训练中存在心肌受损，但该心肌受损是可复的。  相似文献   

Factors predictive of black students' communication with the administration and students at a predominantly white university     

Warren Watson  Ina Siler 《Int J Intercult Relat》1984,8(3):255-267

Black students' interaction with a predominantly white university's administration, faculty, and students appears to be a central issue in current study of black student success in college. This study examined personality and situational factors predictive of black students' communication with such a university's administration, faculty, and students. The development of an instrument describing environmental and social concerns of black students demonstrated reasonable predictive validity of communication with the administration and white students. Feelings about the social environment and tendencies of communication anxiety were among the strongest predictors of black students' communication.  相似文献   

From knowledge to added value: A comparative, panel-data analysis of the innovation value chain in Irish and Swiss manufacturing firms     

Stephen Roper  Spyros Arvanitis 《Research Policy》2012,41(6):1093-1106

The innovation value chain (IVC) divides the innovation process into three separate links or activities: knowledge gathering, knowledge transformation and knowledge exploitation. Here, we report a comparative panel data analysis of the IVC in Ireland and Switzerland. Both economies are small, very open and depend significantly on innovation to maintain competitive advantage. In recent years, however, R&D and innovation growth in Ireland has been markedly stronger than that in Switzerland. We investigate these differences through the ‘lens’ of the IVC. Significant similarities exist between some aspects of firms’ innovation behaviour in each country: strong complementarities emerge between external knowledge sources and between firms’ internal and external knowledge. And, in both countries, in-house R&D and links to customers prove important drivers of innovation. Innovation drives productivity growth in different ways in the two countries, however, through product change in Switzerland and through process change in Ireland. Other differences in the determinants of innovation performance linked to ownership and firms’ institutional context emphasise the systemic nature of innovation and the legacy of past patterns of industrial development.  相似文献   

Selective search, sectoral patterns, and the impact on product innovation performance     

Christian Köhler 《Research Policy》2012,41(8):1344-1356

The shift toward more open and interconnected innovation activities has been a major topic in recent academic and practitioner discussions. Firms must connect their in-house R&D activities with external partners, such as leading customers or universities, to increase the effectiveness of their innovation activities. Hence, management needs to define where to search for valuable knowledge in its environment. In this paper we argue that knowledge search has to reflect the heterogeneity of various knowledge sources with regard to the knowledge they can provide and how these sources can be activated. We hypothesize that search strategies driven by science, suppliers and the product market will contribute differently to innovation success with new-to-market versus imitated products. Moreover, we explore the effect of these types of knowledge search within different sectoral patterns of innovation. Our empirical analysis rests on a sample of almost 5000 firms from five Western European countries. The results support our hypotheses and highlight the potentials and shortcomings of different types of knowledge search.  相似文献   

The impact of national research funds: A regression discontinuity approach to the Chilean FONDECYT     

José Miguel Benavente  Alessandro Maffioli 《Research Policy》2012,41(8):1461-1475

This paper analyses the role of national research funds in promoting scientific production in emerging economies. The study focuses on the impact of the Chilean National Science and Technology Research Fund (FONDECYT). The analysis uses data drawn from international sources of bibliometric information combined with the administrative records of the program's executing unit. To measure the program's impact, we implement a regression discontinuity (RD) design on principal researchers who applied for funding between 1988 and 1997 considering as outcomes both quantity (publications up to 2002) and quality (citations up to 2005) of their scientific production. Our results show significant and positive impact in terms of publications, but no impact in terms of quality of scientific production in the proximity of the program's threshold ranking.  相似文献   

ZrV_2O_7/Al复合梯度材料制备及特性研究     

王晓芳  李玉红  杨光 《咸阳师范专科学校学报》2010,(4)

采用湿化学/高温煅烧法制备ZrV2O7粉末,并以其和金属Al粉为原料,利用粉末冶金法的堆层技术制备ZrV2O7/Al复合梯度材料。通过XRD、SEM抗热震性实验分析,研究了材料的组织及强度。结果表明:湿化学/高温煅烧法制备的ZrV2O7粉末纯度高;在ZrV2O7/Al复合梯度材料中沿梯度材料纵截面方向的成分梯度过渡明显,各层之间结合紧密。热震性实验表明,ZrV2O7/Al梯度材料的耐高温强度高,各层之间粘结性好。  相似文献   

《好人难寻》的叙述声音研究     

林国浒  尹雅莉 《蒙自师范高等专科学校学报》2010,(5):54-57

弗兰纳里·奥康纳是20世纪美国南方文学杰出的女作家,她的作品笔锋犀利,见解独特且富有诗意。本文主要从叙述声音的角度,通过她的著名短篇小说《好人难寻》的叙述声音的具体分析,充分展示该小说叙述的复杂性以及叙述者与小说审美之间的关系。  相似文献   

化学共沉淀法合成锂离子电池LiNi1/3Co1/3Mn1/3O2正极材料的研究     

何冀川  刘树信  霍冀川 《绵阳师范高等专科学校学报》2010,(5):41-44

采用共沉淀法合成了锂离子电池层状LiNi1/3Co1/3Mn1/3O2正极材料。采用TG/SDTA、XRD和SEM对LiNi1/3Co1/3Mn1/3O2正极材料的成分、结构和形貌进行了表征。结果表明,在900℃下煅烧15h制得的材料结晶程度最佳,样品具有最大I（003）/I（104）强比值,层状结构特征最为突出。从单个颗粒来看,样品表面光滑,界面清晰,粒子呈类球状,粒径大约在0.5μm左右,分散较为均匀。另外,添加剂对粒子形貌具有一定的影响。  相似文献   

Fe3O4（100）／STO（100）薄膜的制备及磁输运特性研究     

黄思俞  王宗篪 《三明高等专科学校学报》2013,(4):34-38

采用脉冲激光沉积方法,以烧结的Fe3O4为靶材,在STO（100）基底上制备了Fe3O4（100）薄膜。XRD和AFM显示薄膜为纯相外延单晶薄膜、表面较平整。对薄膜的磁电阻进行测量,薄膜为负磁电阻,且在Verwey转变温度（约120K）时磁电阻最大。霍尔效应测量得到薄膜中栽流子浓度随着温度的降低而减小,In（n）与I／T基本呈线性关系,符合半导体热激活模型,迁移率随着温度的降低而减小,说明在薄膜内存在大量电离杂质中心。薄膜磁滞回线中较高的饱和磁化场。说明薄膜中APBs密度较低。  相似文献   

SO4^2--/La2 O3-ZrO2-HZSM-5催化合成柠檬酸酯     

陈淑芬  甘黎明  尚秀丽  张春兰 《兰州石化职业技术学院学报》2013,(4):11-15

首次合成了固体超强酸催化剂SO4^2--/La2O3-ZrO2-HZSM-5,并用其合成了六种柠檬酸酯,分析了催化剂用量、焙烧温度、反应时间、醇酸比等因素对酯化率的影响。结果表明：500℃焙烧3 h所得催化剂活性最好,柠檬酸酯的酯化率可达91.5%以上,高碳醇的酯化率高于低碳醇的酯化率,且该催化剂具有良好的重复使用和再生能力。  相似文献