半导体热敏特性研究实验装置的改进     

李英 《商洛学院学报》2004,18(2):22-24

运用电量热器、万能电桥等改进大学普通物理实验:“半导体热敏特性研究”的实验装置,使得实验装置简化,便于实际操作,扩大了温度变化范围,正确展示了半导体热敏特性.  相似文献   

浅谈钛在海水冷却换热器中的应用优势     

全迪锋 《大众科技》2015,17(4)

海水容易对传统的换热器产生腐蚀作用,缩短设备的使用寿命。长时间的腐蚀,不仅增加设备维护工作,造成经济损失,而且容易造成设备漏泄,产生安全事故,具有极大的安全隐患,寻找一种适当的材质,从源头上防止海水腐蚀势在必行。通过大量的研究,钛因其具有的特殊性能从众多的材质中脱颖而出,成为海水冷却换热器的首选。  相似文献   

钢在加热时的组织变化分析     

张大林  夏敏  赵林君 《黑龙江科技信息》2015,(16)

钢材在实际使用时,可以根据不同的性能要求对钢材进行不同的热处理工艺处理。一般要经过加热、保温、冷却三个阶段,在加热阶段的加热温度和保持时间都会对其性能产生很大的影响。  相似文献   

2013-2014赛季NBA总决赛马刺队制胜因素分析     

詹磊 《体育科技文献通报》2015,(3):65-66

采用录像观察法、文献资料法和数理统计法对2013~2014赛季NBA总决赛马刺队与热火队5场比赛的技术统计数据进行对比分析。结果表明:通过团队配合,找到空位投篮,提高投篮命中率,特别是3分球命中率,保护好防守篮板球以及控制犯规次数方面的优势是马刺队的制胜因素,另外在核心球员发挥稳定的情况下,其他角色球员的出色表现对马刺队最后赢下比赛也起到了至关重要的作用。  相似文献   

Increasing heat storage by wearing extra clothing during upper body exercise up-regulates heat shock protein 70 but does not modify the cytokine response     

Christof A. Leicht  Aris Papanagopoulos  Sam Haghighat  Steve H. Faulkner 《Journal of sports sciences》2017,35(17):1752-1758

Plasma heat shock protein 70 (HSP70) concentrations rise during heat stress, which can independently induce cytokine production. Upper body exercise normally results in modest body temperature elevations. The aim of this study was to investigate the impacts of additional clothing on the body temperature, cytokine and HSP70 responses during this exercise modality. Thirteen males performed 45-min constant-load arm cranking at 63% maximum aerobic power (62 ± 7%V?O_2peak) in either a non-permeable whole-body suit (intervention, INT) or shorts and T-shirt (control, CON). Exercise resulted in a significant increase of IL-6 and IL-1ra plasma concentrations (P < 0.001), with no difference between conditions (P > 0.19). The increase in HSP70 from pre to post was only significant for INT (0.12 ± 0.11ng?mL^?1, P < 0.01 vs. 0.04 ± 0.18 ng?mL^?1, P = 0.77). Immediately following exercise, T_core was elevated by 0.46 ± 0.29 (INT) and 0.37 ± 0.23ºC (CON), respectively (P < 0.01), with no difference between conditions (P = 0.16). The rise in mean T_skin (2.88 ± 0.50 and 0.30 ± 0.89ºC, respectively) and maximum heat storage (3.24 ± 1.08 and 1.20 ± 1.04 J?g^?1, respectively) was higher during INT (P < 0.01). Despite large differences in heat storage between conditions, the HSP70 elevations during INT, even though significant, were very modest. Possibly, the T_core elevations were too low to induce a more pronounced HSP70 response to ultimately affect cytokine production.  相似文献   

Continuous and intermittent heat acclimation and decay in team sport athletes     

Daniel M. Duvnjak-Zaknich  Karen E. Wallman  Brian T. Dawson  Peter Peeling 《European Journal of Sport Science》2019,19(3):295-304

The aim of this study was to compare the impact of continuous (CON) and intermittent (INT) heat acclimation protocols on repeat-sprint performance, and to also assess the degree of performance decay following acclimation. Using a pair-matched, between subjects design, 16 trained male team sport athletes were allocated to either INT (8 sessions over 15 days) or CON acclimation (8 sessions over 8 days) groups. Participants performed a heat tolerance test (HTT) involving 60-min of repeat-sprint cycling with a 10-min half time break (in 35.3?±?0.7°C, 60.1?±?4.0%; RH) two days pre- (pre-HTT) and post-acclimation (post-HTT1). Decay was investigated with two further HTT's completed over the next two weeks (post-HTT2 and post-HTT3). Results showed the post-HTT1 performance variables [mean power (pre-HTT; INT?=?1002.07?±?173.74, CON?=?1057.10?±?180.07 / post-HTT1; INT?=?1097.11?±?186.85, CON?=?1163.77?±?184.65 W), mean power (W.kg^?1), total work (kJ) and work (J.kg^?1)] were greater than pre-HHT (p?p?相似文献   

Effect of hand cooling on body temperature,cardiovascular and perceptual responses during recumbent cycling in a hot environment     

Alan D Ruddock  Garry A Tew 《Journal of sports sciences》2017,35(14):1466-1474

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零温时空到热时空的变换     

杨纪青 《襄樊学院学报》1999,20(5):25-31

文章综述了零温时空到有限温度时空的变换所伴随的各方面的效应,指出这种变换的实质是真空所对应的相变．  相似文献   

差分方程解的先验估计式——能量方法     

张红梅 《黑龙江科技信息》2009,(17):136-136

用能量分析法给出了向前Euler格式,向后Euler格式解的先验估计式,并给出了证明。  相似文献   

由长春热缩发展引发的股权社会化思考   总被引：2，自引：1，他引：1       下载免费PDF全文

杨柏龄 《中国科学院院刊》2008,23(3):215-219

本文通过调研研究所投资企业长春热缩股权社会化改革的案例,剖析了其在社会化改革中突破困境再度辉煌的历程,同时对目前研究所在股权社会化改革中存在的共性问题进行了简要分析。在此基础上,对股权社会化改革进行了思考并提出了相应的对策建议。  相似文献