This review discusses the social and biological factors that may influence male development from conception to adulthood and also underlie the development of health disorders. It will provide assistance to those who m...This review discusses the social and biological factors that may influence male development from conception to adulthood and also underlie the development of health disorders. It will provide assistance to those who may be considering the formulation of a male health policy. It aims to emphasize that social determinants function on a bio- logical background that is profoundly influenced by a male＇s genome, inherited from his parents. The importance of the male-specific reproductive disorders is emphasized, but these also affect somatic structures through the secretion of androgens secreted from the testes. In turn, the function of the cardiovascular and nervous systems can signifi- cantly influence reproductive processes such as erectile dysfunction.展开更多
The morphology, REE geochemistry and U-Pb geochronology of zircons from quartz monzodiorite in the Sunzhuang area, Fanshi County, Shanxi Province are presented in this study. The zircon crystals can be classified into...The morphology, REE geochemistry and U-Pb geochronology of zircons from quartz monzodiorite in the Sunzhuang area, Fanshi County, Shanxi Province are presented in this study. The zircon crystals can be classified into four main types as： AB, L, S and P, and 24 subtypes such as AB4, ABs, Ls, and S3. The maximum crystallization temperature of zircon was estimated as 850℃, with the minimum of 550℃. The peak temperatures of the zircon crystallization range from 650℃ to 700℃. The abundances of Th and U in the zircon grains show large variation with the Th/U values 〉 0.4. The Th and U values also show a positive correlation in most zircons. The REE abundance of zircon in the quartz monzodiorite ranges from 280.4 ppm to 2143 ppm with an average of 856.4 ppm. The chondrite normalized zircon REE patterns show two types, one is characterized by HREE enrichment and LREE depletion with positive Ce-anomaly and negative Eu-anomaly whereas the other is HREE enriched and LREE depleted with negative Eu-anomaly but without positive Ce-anomaly, and relatively flat patterns. The LA-ICP-MS U-Pb geochronology on the zircons yields a mean age of 133-0.87 Ma. Our data on zircon morphology, composition and U-Pb geochronology reveal that the parent magma of the quartz monzodiorite which was emplaced during late Yanshanian had a mixed crust-mantle source, with crustal components dominating. The magma is inferred to have been water rich and alkaline with initial high oxygen fugacity. Post-magmatic hydrothermal activity occurred under relatively reducing conditions which was conductive for gold precipitation in the Yixingzhai gold deposit.展开更多
Low cycle fatigue crack propagation (FCP) behavior of two PC/ABSblends with a weight ra- tio of PC to ABS being 80/20 and 60/40,respectively, is investigated. Experiments are carried out by usingstandard compact tensi...Low cycle fatigue crack propagation (FCP) behavior of two PC/ABSblends with a weight ra- tio of PC to ABS being 80/20 and 60/40,respectively, is investigated. Experiments are carried out by usingstandard compact tension (CT) specimens. The fracture surfaces areexamined with a scanning electron mi- croscope (SEM). It is shownthat the FCP resistance of PC/ABS blend with 20/100 ABS particles ishigher than that of PC/ABS blend with 40/100 ABS particles. It isfound that proper ABS particle content can result in the tougheningof PC/ABS blends through particle cavitation and shear yielding inmatrix.展开更多
国际新媒体联盟(New Media Consortium,简称NMC)所发布的年度地平线报告已经成为全球范围内教育信息化发展的显示器与风向标。2012年10月,北京开放大学与美国新媒体联盟签署协议,授权北京开放大学作为其在中国发行其年度报告中文版的唯...国际新媒体联盟(New Media Consortium,简称NMC)所发布的年度地平线报告已经成为全球范围内教育信息化发展的显示器与风向标。2012年10月,北京开放大学与美国新媒体联盟签署协议,授权北京开放大学作为其在中国发行其年度报告中文版的唯一官方机构。本期学报正式刊出的2013年度地平线报告显示,未来五年内影响高等教育的六大技术为:大规模开放网络课程、平板电脑、游戏和游戏化、学习分析技术、3D打印技术、可穿戴技术。这些新技术对于我们生活中的沟通交流、获取信息、社会交往、日常学习等方面正在产生重大而深远的影响。希望本报告能够有助于国内同行及时了解国际范围内教育信息化的发展趋势、新技术应用,为促进信息技术更有效地提高教学质量服务提供有益借鉴。新媒体联盟总裁莱瑞博士(Larry Johnson)专门写信祝贺2013年度地平线报告(中文版)刊出:"北京开放大学与新媒体联盟的合作已使成千上万的中国教育界同行有机会围绕教育技术及其在大学和中小学课堂应用问题参与全球对话。北京开放大学以其在教育技术、在线学习的实践探索及开展的国际合作等方面取得的业绩成为国际地平线项目有价值的合作者。你们为地平线专题研究做出了贡献,还承担了地平线报告(中文版)的翻译出版。借助你们的帮助,许多国外同行开始了解信息技术如何在中国这一人口大国的大学和中小学得到应用;同时,也使中国教育界了解世界各国同行正在开展的信息化实践探索。"展开更多
文摘This review discusses the social and biological factors that may influence male development from conception to adulthood and also underlie the development of health disorders. It will provide assistance to those who may be considering the formulation of a male health policy. It aims to emphasize that social determinants function on a bio- logical background that is profoundly influenced by a male＇s genome, inherited from his parents. The importance of the male-specific reproductive disorders is emphasized, but these also affect somatic structures through the secretion of androgens secreted from the testes. In turn, the function of the cardiovascular and nervous systems can signifi- cantly influence reproductive processes such as erectile dysfunction.
基金supported by the Key Program of National Natural Science Foundation of China (Grand No.90914002)the China State Administrative Office of Ore-Prospecting Project for Critical Mines (Grant No.20089937)+1 种基金Nuclear energy research project:study on Sandstone-type uranium deposits prediction technology in Junggar superimposed large basin (Grant No.DH1142)the Introducing Talents of Discipline to Universities Program (B07011)
文摘The morphology, REE geochemistry and U-Pb geochronology of zircons from quartz monzodiorite in the Sunzhuang area, Fanshi County, Shanxi Province are presented in this study. The zircon crystals can be classified into four main types as： AB, L, S and P, and 24 subtypes such as AB4, ABs, Ls, and S3. The maximum crystallization temperature of zircon was estimated as 850℃, with the minimum of 550℃. The peak temperatures of the zircon crystallization range from 650℃ to 700℃. The abundances of Th and U in the zircon grains show large variation with the Th/U values 〉 0.4. The Th and U values also show a positive correlation in most zircons. The REE abundance of zircon in the quartz monzodiorite ranges from 280.4 ppm to 2143 ppm with an average of 856.4 ppm. The chondrite normalized zircon REE patterns show two types, one is characterized by HREE enrichment and LREE depletion with positive Ce-anomaly and negative Eu-anomaly whereas the other is HREE enriched and LREE depleted with negative Eu-anomaly but without positive Ce-anomaly, and relatively flat patterns. The LA-ICP-MS U-Pb geochronology on the zircons yields a mean age of 133-0.87 Ma. Our data on zircon morphology, composition and U-Pb geochronology reveal that the parent magma of the quartz monzodiorite which was emplaced during late Yanshanian had a mixed crust-mantle source, with crustal components dominating. The magma is inferred to have been water rich and alkaline with initial high oxygen fugacity. Post-magmatic hydrothermal activity occurred under relatively reducing conditions which was conductive for gold precipitation in the Yixingzhai gold deposit.
基金the Excellent Young Teachers Programthe Research Foundation for Doctoral Project of the Ministry of Education of China.
文摘Low cycle fatigue crack propagation (FCP) behavior of two PC/ABSblends with a weight ra- tio of PC to ABS being 80/20 and 60/40,respectively, is investigated. Experiments are carried out by usingstandard compact tension (CT) specimens. The fracture surfaces areexamined with a scanning electron mi- croscope (SEM). It is shownthat the FCP resistance of PC/ABS blend with 20/100 ABS particles ishigher than that of PC/ABS blend with 40/100 ABS particles. It isfound that proper ABS particle content can result in the tougheningof PC/ABS blends through particle cavitation and shear yielding inmatrix.
文摘氯平衡原理在降雨极其稀少的干旱区研究地下水补给具有较强的适用性,与H、O稳定同位素及含水量在包气带垂向的变化相结合,能够准确地计算地下水的多年平均补给率.在巴丹吉林沙漠南缘的2个钻孔剖面分别记录了过去574 a(B1)和812 a(B2)以来的补给量变化过程及其所反映的气候波动特征,在该地区,多年降雨量为89 mm,而补给量平均仅为1.3 mm/a,从B2剖面完整的记录可以将800 a B P气候划分为4个干期和3 个湿期.1500～1530年是干旱区气候突变的时期,18世纪末至19世纪初是气候环境演化的又一个十分重要的时间界限,自此以后的漫长时间,干旱化进程进一步加剧.
文摘国际新媒体联盟(New Media Consortium,简称NMC)所发布的年度地平线报告已经成为全球范围内教育信息化发展的显示器与风向标。2012年10月,北京开放大学与美国新媒体联盟签署协议,授权北京开放大学作为其在中国发行其年度报告中文版的唯一官方机构。本期学报正式刊出的2013年度地平线报告显示,未来五年内影响高等教育的六大技术为:大规模开放网络课程、平板电脑、游戏和游戏化、学习分析技术、3D打印技术、可穿戴技术。这些新技术对于我们生活中的沟通交流、获取信息、社会交往、日常学习等方面正在产生重大而深远的影响。希望本报告能够有助于国内同行及时了解国际范围内教育信息化的发展趋势、新技术应用,为促进信息技术更有效地提高教学质量服务提供有益借鉴。新媒体联盟总裁莱瑞博士(Larry Johnson)专门写信祝贺2013年度地平线报告(中文版)刊出:"北京开放大学与新媒体联盟的合作已使成千上万的中国教育界同行有机会围绕教育技术及其在大学和中小学课堂应用问题参与全球对话。北京开放大学以其在教育技术、在线学习的实践探索及开展的国际合作等方面取得的业绩成为国际地平线项目有价值的合作者。你们为地平线专题研究做出了贡献,还承担了地平线报告(中文版)的翻译出版。借助你们的帮助,许多国外同行开始了解信息技术如何在中国这一人口大国的大学和中小学得到应用;同时,也使中国教育界了解世界各国同行正在开展的信息化实践探索。"
