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INTRODUCTIONCucumbermosaicvirus (CMV) ,thetypespeciesofthegenusCucumovirusoffamilyBro moviridae,isanisometricviruswithatripartitesingle strandedRNAgenomeofpositivepolari ty.CMVhasaparticularlywidehostrange ,in fectingmorethan 80 0speciesinover 70familieso… 相似文献
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低密度奇偶校验（LDPC）码是一种具有稀疏奇偶校验矩阵的线性分组码,其性能可逼近香农限。由于其具有优异的性能,非常适合在未来的无线通信系统中应用,已成为信道编码领域的研究热点。DVB—s2是欧洲数字视频广播项目组在2003年开发出来的第二代卫星广播标准,采用了LDPC码作为前向纠错码。文章在分析LDPC码的基础上,研究... 相似文献
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Ferenc Torma Zoltan Gombos Marcell Fridvalszki Gergely Langmar Zsofia Tarcza Bela Merkely Hisashi Naito Noriko Ichinoseki-Sekine Masaki Takeda Zsolt Murlasits Peter Osvath Zsolt Radak 《运动与健康科学(英文)》2021,10(4):470
BackgroudBlood flow restriction (BFR) with low-intensity resistance training has been shown to result in hypertrophy of skeletal muscle. In this study, we tested the hypothesis that BFR during the rest periods between acute, high-intensity resistance exercise sessions (70% of 1 repetition maximum, 7 sets with 10 repetitions) enhances the effects of the resistance training.MethodsA total of 7 healthy young men performed squats, and between sets BFR was carried out on one leg while the other leg served as a control. Because BFR was applied during rest periods, even severe occlusion pressure (approximately 230 mmHg), which almost completely blocked blood flow, was well-tolerated by the participants. Five muscle-specific microRNAs were measured from the biopsy samples, which were taken 2 h after the acute training.ResultsDoppler data showed that the pattern of blood flow recovery changed significantly between the first and last BFR. microRNA-206 levels significantly decreased in the BFR leg compared to the control. The mRNA levels of RAC-β serine/threonine-protein kinase v22, nuclear respiratory factor 1, vascular endothelial growth factor, lupus Ku autoantigen protein p70 genes (p < 0.05), and paired box 7 (p < 0.01) increased in the BFR leg. The protein levels of paired box 7, nuclear respiratory factor 1, and peroxisome proliferator-activated receptor γ coactivator 1α did not differ between the BFR leg and the control leg.ConclusionBFR, during the rest periods of high-load resistance training, could lead to mRNA elevation of those proteins that regulate angiogenesis, mitochondrial biogenesis, and muscle hypertrophy and repair. However, BFR also can cause DNA damage, judging from the increase in mRNA levels of lupus Ku autoantigen protein p70. 相似文献
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万英娟 《广东广播电视大学学报》2001,10(4):29-31
中国教育卫星宽带多媒体传输网的开通，应用在远程教育中具有数字化、双向传输、多元化、适合国情、性价比高等优点。中国教育宽带传输网为电大系统开展现代远程教育创造了更为先进的教学条件和广阔的发展前景。 相似文献
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电视新闻评论节目近几年来整体质量不高,尤其是省级卫视的新闻评论节目发展缓慢。广电总局“限娱令”的颁布成为电视新闻评论节目新的发展契机,也成为摆在省级卫视新闻媒体工作者面前的一项挑战。鉴于此,本文全方位把脉中国内地省级卫视的新闻评论节目,从媒介生态环境到发展现状中呈现的特点和存在的问题,为省级卫视的新闻评论节目提供发展思路,并对当前新闻评论节目的争议性话题提出见解,同时对节目未来发展过程中＊-T~g出现的问题发出预警,以期对实践工作具有理论指导意义,使省级卫视新闻评论节目走出困局。 相似文献
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本文设计了一个典型Mamdani类PD型模糊控制器来研究卫星大角度姿态机动控制问题。卫星姿态机动控制要求控制系统响应快、具有较强鲁棒性。模糊控制器的设计十分灵活,在控制性能方面有自己突出的特点。通过仿真,考察了模糊控制器的隶属函数在各种参数下的不同控制性能,与一个传统I/O解耦PID控制器的控制效果进行比较,并验证了模糊控制器的鲁棒性。仿真结果证实模糊控制用于姿态机动控制有良好的效果。 相似文献
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随着卫星建设的不断推进,现有卫星终端在应用过程中显现了一些问题:卫星传输的资源与个性化服务需求之间存在一定差距,终端操作复杂,建设及运行维护成本较高。为了改进卫星终端服务模式存在的弊端,增强卫星终端设备及软件的易用性,实现定制化资源传输,应采用双向卫星通信及数据接收机顶盒技术,以改进当前卫星终端应用模式,进一步提高信息服务水平。 相似文献
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欧阳常林 《湖南大众传媒职业技术学院学报》2010,10(6):10-12
湖南电视媒体的发展,文选德同志曾有三个很好的评价：一是有线台打破了格局,二是经视引发了竞争,三是上星带来了想象。40年历程,湖南卫视之所以能真正做强做大品牌,领先全国同行,主要归功于魏文彬同志1993年提出的＂大广播、大宣传、大电视、大产业＂发展思路。 相似文献
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"快乐中国":媒介文化视域里的湖南卫视传播理念解读 总被引：1，自引：0，他引：1
湖南卫视秉持“快乐中国”的核心理念,在娱乐节目品牌建设实践上获得了市场成功。但主要依据商业主义逻辑进行生产的节目内容引发“通俗”与“高雅”的媒介文化之争,湖南卫视应该调整传播理念,强化社会责任感,树立公信力。 相似文献
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In Canada, government initiatives for the measurement of cultural value can be traced to the 1949 Royal Commission on National Development in Arts, Letters and Sciences, and later evolved to include more empirical measurement with the Culture Statistics Program (1972) as well as research into the social dimensions of cultural investment. In 2009, Statistics Canada launched a four-year Feasibility Study to culminate in the creation of a Canadian Culture Satellite Account (CSA), an accounting framework to measure the impact of culture, the arts, heritage and sport on the Canadian economy. Taking account of both the recent and broader historical context out of which the CSA emerged, this paper examines its intended use and future plans. The CSA is a useful tool to the Government of Canada in supporting its activities related to the funding of culture, but this paper takes the position that it is not in and of itself a sufficient means for measuring the value of culture in Canada, and so it is best understood as part of a constellation of tools with differing but complementary approaches. 相似文献