体外冲击波在运动系统疾病中的应用     

许睿 《山西师大体育学院学报》2011,26(2):123-125

体外冲击波是应用于运动系统疾病领域的一种安全有效的非侵袭性治疗手段。本文综述了体外冲击波的原理,在运动系统疾病中的应用,目前存在的问题,并展望了其应用前景。  相似文献   

Re及Ma对边界层的影响分析     

王继明 《中国科技信息》2011,(19):66-66

本文分析了跨音速流中Ma及Re对边界层的影响,结论为Ma的增加使得激波强度增加,流向逆压梯度增加,边界层厚度增加较快,容易分离;Re的增加有两个效应：一是使得转捩提前,二是使得边界层变薄。R e增加使得激波后机翼表面压力降低,升力损失减小。跨音速范围内,Re对边界层与外流的干扰十分显著。  相似文献   

热冲击和冲击荷载作用下弹塑性薄板的综合变形分析     

赵启超  孙胜 《黑龙江科技信息》2011,(8):227-227

在计算火灾爆炸环境中弹塑性简支薄板变形时,同时考虑了热冲击和均布冲击荷载的作用,建立了薄板的运动方程,研究并分析了弹塑性简支薄板的综合变形,其分析结果表明弹塑性简支薄板受到热冲击和均布冲击荷载作用时,应综合分析这两种不同荷载的作用。  相似文献   

中国经济韧性的现实表征、动态演化与决定因素     

唐任伍  李楚翘 《北京师范大学学报(社会科学版)》2022,(1):23-35

经济韧性是经济体抵御冲击扰动、自我恢复和调节重组的重要机能,中国经济在2020年应对新冠肺炎疫情冲击并快速恢复过程中展现出强劲韧性。文章在系统梳理经济韧性的概念内涵和分析工具的基础上,运用核心变量法考察中国经济韧性在各种危机下的现实表现并追踪其动态演进路径,借助构建的经济韧性表现整合模型加以阐释,为客观呈现和把握中国经济发展及韧性培育过程提供了重要依据。同时,深入探究包括内质禀赋、制度安排、政策工具、历史文化等在内的多重因素对经济韧性的影响和决定作用,有助于进一步巩固夯实中国经济系统的韧性能力,推动经济发展高质量转型升级。  相似文献   

妇产科A群链球菌中毒性休克综合症的诊断     

刘宏辉  任源 《岳阳职业技术学院学报》2005,20(2):49-51

链球菌中毒性休克综合症(StrepTSS)为A群链球菌(GAS)所引起的一种罕见而严重的疾病,与妇产科关系密切。自上世纪80年代以来,有关的报道不断增多,已引起了妇产科科学界越来越广泛的注意。本文就近年来妇产科有关StrepTSS的临床表现及诊断方法的最新研究进展作一综述。  相似文献   

运动与热休克蛋白表达   总被引：7，自引：0，他引：7  

陆阿明  陆爱云 《上海体育学院学报》2002,26(3):35-38

运用文献资料法，对运动与热休克蛋白表达及其相关进行了综述，并就其在运动与训练中的损伤保护及防止过度训练等潜在研究价值，进行了探讨。  相似文献   

提高8号煤矿许用毫秒雷管可燃气安全度方法探析     

关向斌  郑德军 《鸡西大学学报》2010,10(3):55-56

通过大量的试验和理论分析,找出了影响8号煤矿许用毫秒延期电雷管可燃气安全度的原因,并制定了提高可燃气安全的措施。  相似文献   

Heat shock protein 90 protects rat mesenchymal stem cells against hypoxia and serum deprivation-induced apoptosis via the PI3K/Akt and ERK1/2 pathways     

Feng Gao  Xin-yang Hu  Xiao-jie Xie  Qi-yuan Xu  Ya-ping Wang  Xian-bao Liu  Mei-xiang Xiang  Yong Sun  Jian-an Wang 《Journal of Zhejiang University. Science. B》2010,11(8):608-617

Mesenchymal stem cell(MSC)transplantation has shown a therapeutic potential to repair the ischemic and infracted myocardium,but the effects are limited by the apoptosis and loss of donor cells in host cardiac microenvironment.The aim of this study is to explore the cytoprotection of heat shock protein 90(Hsp90)against hypoxia and serum deprivation-induced apoptosis and the possible mechanisms in rat MSCs.Cell viability was determined by3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay.Apoptosis was assessed by Hoechst 33258nuclear staining and flow cytometric analysis with annexin V/PI staining.The gene expression of Toll-like receptor-4(TLR-4)and V-erb-b2 erythroblastic leukemia viral oncogene homolog 2(ErbB2)was detected by real-time polymerase chain reaction(PCR).The protein levels of cleaved caspase-3,Bcl-2,Bcl-xL,Bax,total-ERK,phospho-ERK,totaI-Akt,phospho-Akt,and Hsp90 were detected by Western blot.The production of nitric oxide was measured by spectrophotometric assay.Hsp90 improves MSC viability and protects MSCs against apoptosis induced by serum deprivation and hypoxia.The protective role of Hsp90 not only elevates Bcl-2/Bax and Bcl-xL/Bax expression and attenuates cleaved caspase-3 expression via down-regulating membrane TLR-4 and ErbB2 receptors and then activating their downstream PI3K/Akt and ERK1/2 pathways,but also enhances the paracrine effect of MSCs.These findings demonstrated a novel and effective treatment strategy against MSC apoptosis in cell transplantation.  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   

Impediments to Partnership: A literature review of school‐university links     

Lea Smedley 《Teachers and Teaching》2013,19(2):189-209

Partnership innovations between teacher educators on school and university sites have become ubiquitous. Calls for bridging the theory/practice gap have been answered with reappraisal and restructuring of programs. The literature on the rationale and implementation of a partnership approach has grown steadily since the early 1980s. Praise for measures that promote increased and meaningful interaction between the key players is now almost universal. Ironically, simultaneously, this documentation reveals the challenges as well as the promises of partnership. Clear impediments to the creation and nurturing of partnership have emerged. This paper takes as its principal focus an exploration of the literature that examines the range of barriers encountered by teachers of future teachers.  相似文献