Trace Element Abundance Relationships in the Multi-stage Comagmatic Fractional Crystallization and Their Applications

In this study a mathematical expression of trace element abundance relationship for the mul-ti-stage comagmatic fractional crystallization has been established ,based on geochemical studies of the Emeishan basalt-trachyte series and adjacent mafic-ultramafic layered intrusions, as well as on the avail-able data for basalt, andesite, dacite and rhyolite series in southern Andes,Chile ,which have been well documented.It is demonstrated that the abundance constant (R) for a given trace element at dif-ferent stages of fractional crystallization of a parental magma is highly variable,which can be used as a criterion to divide fractional crystallization stages.

Transmedia le05媒体艺术节

Transmediale是德国规模最大且最具代表性的艺术及数码媒体创作节日。一年一度的艺术节推出数码文化领域中最新的出色作品。同时也反映出数码技术在当代社会中所扮演的角色。这是一个艺术家,媒体工作者和广大艺术爱好者交流的平台,并具有日益提升的国际影响力。

成都市城乡老年人老年护理人才需求的调查研究

目的 了解成都市城、乡老年人对老年护理人才的需求特点及差异,为老年护理人才培养及资源配置规划提供依据.方法 使用自制《老年护理人才应具备的知识、能力和素质调查问卷》采用方便抽样法调查长期居住在成都市主城区和郊区（县）60岁及以上的老年人2126人,其中主城区747人,郊区（县）1379人.结果 城、乡老年人对老年护理人才在知识、能力和素质方面的需求有共同性也有差异,城区老年人要求更高、范围更广、内容更具体.结论 老年护理人才培养和资源设置时需要考虑地域差别、城乡差别.