Light-load maximal lifting velocity full squat training program improves important physical and skill characteristics in futsal players

This study aimed to compare the effect of 6 weeks of resistance training or combined resistance training and change of direction exercises on physical performance and motor skills in futsal players. Thirty-four futsal players were divided into full squat group (SG, n = 12), combined full squat and change of direction exercises group (S+CDG, n = 12) and control group (CG, n = 10). The resistance training for SG consisted of full squat with low load (~45–58% 1RM) and low volume (4–6 repetitions), whereas the S+CDG performed the same resistance training program combined with loaded change of direction. Sprint time in 10 and 20 m, change of direction test, countermovement vertical jump (CMJ) height, maximal strength and force–velocity relationship in full squat exercise, kicking speed ball (BS_mean) and repeated sprint ability (RSA_mean) were selected as testing variables. Both experimental groups showed significant improvements for CMJ, BS_mean and all strength parameters. Only SG resulted in significant sprint gains, whereas S+CDG also achieved significant improvements in RSA_mean. The CG remained unchanged after training period. No significant differences were found between both experimental groups. These findings suggest that only 12 sessions of either lightweight resistance training alone, lifting the load at maximal intended velocity or combined with change of direction exercises is enough to improve several physical and skills capacities critical to futsal performance in adult players.     

WorldView-2影像的水深探测能力

以中国南海东岛周边海域为研究区域,利用波段组合法开展高分辨WorldView-2影像的水深探测能力研究,分别建立单波段、双波段和多波段模型,进行精度评价。结果表明：多波段模型反演效果最好,双波段次之,单波段最差;各波段水深探测能力比较：绿波段 >全色波段 >蓝波段 >红波段;前视影像比后视影像的水深反演精度略高,全色波段在水深探测中具有重要作用。     

单源三站外辐射源雷达目标探测性能

论述全向外辐射源雷达空中目标探测系统的主要问题及系统体制损失。针对单源单站（SISO）和单源三站（SITO）两种工作方式,在接收天线阵元数相同的情况下分析探测距离和定位精度。在单源三站条件下推导直角坐标系中的目标速度矢量表达式,并分析速度测量精度。研究结果表明,在一定条件下,单源三站组网方式的空间覆盖范围与单源单站相当,且具有平面定位精度较高,可获得目标速度矢量和技术实现难度小的特点。     

市场经济对公共体育的影响与变迁

探讨市场经济对公共体育的影响,揭示公共体育改革的深层是市场经济的意蕴;梳理市场经济下的公共体育变迁,明确公共体育的性质、路向和政府的体育政策、权力行为;为合理配置体育市场资源,促进和成熟政府体育政策、权力行为实践的理性自觉,推进小康社会体育建设,提供理论支撑和实践走向.     

基于深度学习的SSD模型尾矿库自动提取

针对华北地区尾矿库自动提取问题,将基于深度学习的SSD目标检测模型应用于遥感图像尾矿库提取。首先标记华北地区2 000个样本,随机挑选1 500个作为训练样本,剩余样本作为测试样本,验证模型的检测精度。分析卷积层对应感受野与图像中尾矿库尺寸关系,发现原始SSD模型漏检误检大型尾矿库。改进SSD模型结构,提出增加额外卷积层的策略,提高对大型尾矿库目标的检测精度。实验表明,在置信度阈值为0.3时,改进的SSD模型相比原始模型,检测精确率提高10.0%,召回率提高14.4%,提高了大型尾矿库检测精度。验证了基于深度学习的SSD目标检测模型自动提取尾矿库的可行性以及改进算法的有效性。     

Understanding human influence on climate change in China

China''s climate has been warming since the 1950s, with surface air temperature increasing at a rate higher than the global average. Changes in climate have exerted substantial impacts on water resources, agriculture, ecosystems and human health. Attributing past changes to causes provides a scientific foundation for national and international climate policies. Here, we review recent progress in attributing the observed climate changes over past decades in China. Anthropogenic forcings, dominated by greenhouse gas emissions, are the main drivers for observed increases in mean and extreme temperatures. Evidence of the effect of anthropogenic forcings on precipitation is emerging. Human influence has increased the probability of extreme heat events, and has likely changed the occurrence probabilities for some heavy precipitation events. The way a specific attribution question is posed and the conditions under which the question is addressed present persistent challenges for appropriately communicating attribution results to non-specialists.     

立足专业领域 提升医学期刊社会效益——以“中国实用”系列医学杂志为例

医学期刊是我国出版阵地的重要组成部分,期刊出版单位必须把期刊的社会效益放在首位,实现社会效益和经济效益相统一。本文以“中国实用”系列医学杂志为例,总结分析医学期刊在舆论导向、提升专业影响力、承担社会责任以及加强期刊队伍建设等方面努力提升期刊社会效益的方法,以期有效推动期刊出版工作高质量发展。     

论当前我国网球职业化发展的政策与舆论导向

通过对我国网球职业化发展的政策与舆论导向的研究,剖析我国网球运动在职业化发展进程中所存在的弊端与漏失,理性地评判所取得的成绩,并对舆论导向在我国网球职业化发展过程中所兼具的重要责任与功效进行分析,目的在于为探求具有中国特色的网球职业化发展之路提供必要的理论借鉴与参考。     

“和”文化对武术发展的影响

文章采用文献资料法,通过对中国传统“和”文化的四个主要表现特征进行简要分析,研究并总结了中国传统“和”文化对武术的理论、道德、技能及未来发展道路的影响,以期为继承中国传统武术的特色,凸显武术的文化特征,把握武术发展方向提供有益的依据.     

Registration Method for CT-MR Image Based on Mutual Information

Medical image registration is the process of finding ageometric transformation between two image-based coordi-nate systems that have the same patient-based coordinates ,i .e .the same anatomic locations .The registered multi-mo-dality images lead to impro…