Exploratory insights from the right-sided electrocardiogram following prolonged endurance exercise     

Rachel Lord  Keith George  John Somauroo  Nikhil Jain  Kristin Reese  Martin D. Hoffman 《European Journal of Sport Science》2016,16(8):1014-1022

Background: Prolonged strenuous exercise has a profound effect on cardiac function. The right heart may be more susceptible to this imposition; yet, right-sided chest leads have not been utilised in this setting. Methods: Thirty highly trained athletes at the 2014 Western States 100-mile Endurance Run from Squaw Valley to Auburn, California (body mass 68?±?12?kg, age 45?±?10?years, 57?±?15?miles per week) were recruited for the study. Pre- and post-race, a right-sided 12-lead ECG was obtained and data were extracted for P, R and S waves, J point, ST segment and T wave amplitude. Data were compared using Students T-test and statistical significance set as P?Results: There was a significant increase in P wave amplitude (29%) and QTc interval (4%) pre- to post-race from standard 12-lead ECG. From the right-sided12-lead ECG, a 23% (P?=?.01) and 38% (P?=?.03) increase in J point amplitude in V1R and V2R and a 22% (P?=?.05) increase in ST segment integral in V2R and V3R were evident. T wave inversion was evident in leads V2R–V6R in 50–90% of athletes, respectively. Close examination revealed marked heterogeneity in individual ECGs. Conclusions: Completion of a 100-mile ultra-marathon resulted in significant changes in the right-sided ECG alongside more marked responses in specific individuals. P wave, ST segment and T wave changes post-race are indicative of acute exercise-induced right heart electrical adaptation.  相似文献   

基于遗传算法的自动频率规划     

郝宁波 《安阳师范学院学报》2005,(5):65-68

介绍了自动频率规划及用遗传算法如何进行自动频率规划的方法,并说明了对遗传算法的各个算子的设计方法及原因.提出了如何利用正交试验设计的方法来科学地设置参数.同时将正交试验方法引入通信领域中,提出了用正交试验设计方法设置参数.  相似文献   

China's Spectrum Factory Gathers Momentum     

XIN Ling 《中国科学院院刊(英文版)》2014,(4):288-291

<正>Only one year of pilot survey followed by two years of spectroscopic survey,LLAAMMOOSSTT––––CChhiinnaa’’ss ffiirrsstt wwoorrlldd--ccllaassss tteelleessccooppee––––hhaadd aallrreeaaddyy aaccqquuiirreedd tthhee ssppeeccttrraa of about 3.5 million stars in the Milky Way by July 2014.With further accumulation of data,it will greatly deepen our understanding of the structure,formation and evolution of our home Galaxy.  相似文献   

洪迈诗歌用韵频率考     

黄燕妮 《湖北广播电视大学学报》2012,(1):72-73

本文全面分析了《全宋诗》收录的洪迈105首诗的用韵频率情况,数据库对于诗歌用韵研究具有辅助作用。  相似文献   

Investigation and evaluation of ultrasound reactor for reduction of fungi from sewage     

Dehghani MH  Mahvi AH  Jahed GR  Sheikhi R 《Journal of Zhejiang University. Science. B》2007,8(7):493-497

The objective of the investigation was to study the application of ultrasound reactor technology （USRT） as a disinfectant for reduction of fungi from sewage effluent. Fungi are carbon heterotrophs that require preformed organic compounds as carbon sources. USRT is an attractive means to improve water quality because of the system simplicity and no production of toxic by-products. An ultrasound reactor produces strong cavitation in aqueous solution causing shock waves and reactive free radicals by the violent collapse of the cavitation bubble. These effects should contribute to the physical disruption of microbial structures and inactivation of organisms. There was significant reduction in fungal growth, with decreased fungal growth with increasing USRT. In this study, ultrasound irradiation at a frequency of 42 kHz was used to expose suspensions of fungi to evaluate the disinfection efficacy of the ultrasound reactor. Also, this study showed that in this system more than 99% reduction of sewage fungi was achieved after 60 min.  相似文献   

一种新型双通带频率选择表面设计     

李文兴  祁玉 《黑龙江科技信息》2015,(7):73-74

本文提出了一种可以在S/C双波段形成具有高选择性通带的新型FSS,通带中心分别为2GHz和4GHz。讨论了该双通FSS的传输带宽及稳定性问题,仿真结果表明其性能良好。该FSS能用作多频馈源反射天线的副反射器和S/C双频段集成雷达的透波罩,为实现频率复用和提高天线利用率提供了可能性。  相似文献   

自闭症谱系障碍自我刺激行为研究综述     

涂梦璐 《毕节学院学报》2015,(3):77-82

自我刺激行为是自闭症的常见行为之一,虽然它不一定是挑战性行为,但是严重的自我刺激行为会损害自闭症的身体,阻碍自闭症的社会性发展.通过对文献的梳理,分析自我刺激行为与挑战性行为、重复刻板行为的关系、自我刺激行为的表现形式及形成原因等,重点探讨自闭症自我刺激行为的干预策略,为今后的研究和干预提供参考.  相似文献   

基于单片机实现SPWM变频调速系统设计     

黄灿胜  杨秀增 《钦州学院学报》2010,25(3):1-3,7

设计一种基于单片机实现SPWM变频调速的系统,给出了单片机实现三相交流电动机SPWM变频调速的硬件电路及采用对称规则进行采样的SPWM波形的软件方法。实践表明,该系统工作稳定,可靠性高,能用于三相交流电动机变频速度中,具有较好的实用价值。  相似文献   

江有诰《诗经韵读》和王念孙《古韵谱》用韵比较     

曹强 《安康学院学报》2010,22(6):41-47

江有诰《诗经韵读》与王念孙《古韵谱》的用韵差异主要表现在五个方面：对句末韵字的入韵方式理解不同;对某些句中字是否入韵理解不同;对句末韵字和句中字是否同时押韵理解不同;对某些句子或篇章是否有韵理解不同;对某些篇章韵例理解相同,但对入韵字理解不同。通过比较发现,总体而论,江氏和王氏在研究《诗经》用韵上各有得失,江氏之得远远多于王氏。相较而言,江氏对韵和非韵的辨别,比王氏高明;江氏比王氏更注重同篇各章在韵式上的整齐性;江氏在分析句中字是否入韵时,较王氏谨慎;江氏对某些句子或篇章是否入韵的处理,较王氏有道理。  相似文献   

1990 年-2009 年西北太平洋热带气旋活动分析     

刘欢  刘荣高 《资源科学》2012,34(2):242-247

利用上海台风研究所整编的《CMA-STI热带气旋最佳路径数据集》数据资料,建立了以每次热带气旋6h间隔中心位置为基础的西北太平洋地区1°×1°经纬度格网,统计分析了西北太平洋地区1990年-2009年热带气旋的路径变化、发生频数、频率的年际分布和季节分布等。结果表明：①西北太平洋热带气旋影响的区域大概为100°-180°E,3.5°-51°N,主要影响的国家和地区有：菲律宾群岛,中南半岛,中国东部沿海各省、海南省、台湾省,朝鲜半岛及日本三岛;②西北太平洋地区热带气旋发生次数有减少趋势,2000年-2009年年均发生次数比1990年-1999年年均少3次;③7月-10月热带气旋发生频繁,其中8月占到20年各月累计的21%;④热带气旋频数分布密集区为南海中北部以东、菲律宾吕宋岛以东,整体呈抛物线向东辐射减少;⑤热带气旋路径频率值的分布存在明显的季节性变化,突出表现为频率最高值中心位置的规律性移动。  相似文献