河北省育新学校1986—1992年结核病流行情况

河北省育新学校环境特殊,接受犯罪的少年入学。因为接触密切,极易造成传染病的流行。1986～1992年三次结核病普查,结核病疫情严重,已形成结核病暴发流行。提示我们在结防工作中要重视这一特殊学校的结核病防治。     

Genesis of zircon and its constraints on interpretation of U-Pb age

Zircon U-Pb dating is the most commonly used method for isotopic geochronology. However, it has been a difficult issue when relating zircon U-Pb ages to metamorphic conditions in complex metamorphic rocks. Much progress has been made in the past decade with respect to the genesis of zircon and its constraints on interpretation of U-Pb age. Three methods have been proposed to link zircon U-Pb age to metamorphic conditions: ( i ) internal structure; ( ii ) trace element feature; (iii) mineral inclusion composition. Magmatic zircon shows typical oscillatory zoning and/or sector zoning, whereas metamorphic zircon has internal structures such as no zoned, weakly zoned, cloudy zoned, sector zoned, planar zoned, and patched zoned ones. Zircons formed in different geological environments generally have characteristic internal structures. Magmatic zircons from different rock types have variable trace element abundances, with a general trend of increasing trace element abundances in zircons from ultramafic through mafic to granitic rocks. Zircons formed under different metamorphic conditions have different trace element characteristics that can be used to relate their formation to metamorphic conditions. It is an effective way to relate zircon growth to certain P-T conditions by studying the trace element partitioning between coexisting metamorphic zircon and garnet in high-grade metamorphic rocks containing both zircon and garnet. Primary mineral inclusions in zircon can also provide unambiguous constraints on its formation conditions. Therefore, interpretation of zircon U-Pb ages can be constrained by its internal structure, trace element composition, mineral inclusion and so on.     

河南省星火计划项目指南(2004年度)

<正> 2004年度,为贯彻国家《"十五"星火计划发展纲要》和全国星火计划工作会议精神,河南省星火计划继续围绕农业增效,农民增收总目标,以市场为导向,以产品为龙头,以技术为依托,以效益为中心,积极培育农村新的经济增长,发展新兴产业,加速农村经济结构调整,培育产业化龙头企业,努力探索和推进传     

热分析谱图的微型计算机检索

热分析能作为独立检测或为其它检测方法的辅助手段以鉴定化合物。我们在去年引进了一台匈牙利MOM型热分析仪。该仪器带有1500℃高温炉,并具有同时测定TG、DTG、DTA的性能。按常规,热分析的定性方法是将实验得到的热谱图与标准曲线图谱资料对照。这种     

陆机入洛疑案新断

陆机入洛是研究其生平的一个关节点。陆机自太康元年至元康七年5次入箔,皆与其出处行藏相关,是解读陆机“诗缘情”主张的思想基础。     

多元汇"和" 文质相称--先秦至唐宋修辞学研究特质

先秦至唐宋修辞学研究的特点是以文(形式)质(内容)相谐为基线,多元汇"和",色彩纷呈.不论是消极、积极修辞乃至文风,都显现出由情入理的特质.     

Geochronology of source materials from high-pressure and ultrahigh-pressure metamorphic rocks in Jurassic sedimentary rocks of Hefei Basin

Eclogite cobbles were discovered by Wang et al. (2001) in the Fenghuangtai Formation of the northern margin of Dabie Mountains in the Dushan area of Anhui Province, China[1]. They proposed that after the formation during the Triassic, the high-pressure (HP) and ultra-high-pressure (UHP) metamorphic rocks reached the sur-face through exhumation and uplifting before the late Ju-rassic. However, they have not provided any evidence about isotopic ages. One kind of cobbles of HP-UHP rocks w…     

卫生职业教育为什么要上物理课

2004年，联合国大会在关于确定2005年为“国际物理年”的决议中指出：物理学是认识自然的基础，物理学是当今众多技术发展的基础，物理教育为人类发展提供了必要的科学基础．决议高度评价了物理学在人类认识世界、改变人类社会、提高公众的科学文化素质等方面所起的重大作用．     

北京2008年奥运会“人文奥运”的实践思路

采用文献资料调研、专家访谈等方法在对"人文奥运"内涵阐释的基础上,提出了2008年北京"人文奥运"的具体实践思路,旨在为北京奥运会的成功举办以及群众体育的发展提供有益借鉴。     

长江三角洲地区的浓雾事件及其气候特征

为分析区域性浓雾事件的气候特征及演变规律,利用1954—2005年长江三角洲地区24个国家级气象站的实测大雾和能见度资料,探讨了典型浓雾事件的判定方法,建立起该区域52年较完整的浓雾序列．初步结果表明:1954—2005年,长江三角洲地区总共出现564例较为典型的浓雾事件;仲秋至仲春(10月—次年4月)为浓雾的多发季节,约占总数的89．9％,夏季由于气温高、对流天气多,浓雾的发生概率很小,只占总数的1.6％;20世纪60年代浓雾事件少而弱,70年代末至80年代初经历由少到多的转变,且以1978年为序列的突变点,此后该地区浓雾事件频次高,强度强,不确定性大,尤其以80年代为最多,以90年代为最强;2000—2005年浓雾事件的频次和强度有较明显的回落．