排序方式： 共有95条查询结果，搜索用时 15 毫秒
91.
采用基于密度泛函理论(DFT)框架下广义梯度近似平面波超软赝势法,计算了闪锌矿型CdTe的能带结构、态密度和光学性质.计算表明,闪锌矿型CdTe为直接带隙半导体,禁带宽度为0.671eV.计算并分析了闪锌矿型CdTe的复折射率、复介电函数、吸收系数、光电导率、损失函数和反射率,其折射率为2.69,静态介电常数为7.23.计算结果与其他文献结果吻合较好,为闪锌矿型CdTe的应用提供了理论依据. 相似文献
92.
Chitra Upadhyaya Sandhya Mishra Peeyush Ajmera Praveen Sharma 《Indian journal of clinical biochemistry : IJCB》2004,19(2):48-52
Pregnancy is associated with increased demand of all the nutrients like Iron, Copper, Zinc etc. and deficiency of any of these
could affect pregnancy, delivery and out come of pregnancy. With this consideration, the study was conducted on 80 mothers
and newborns and 20 age matched control women. Out of 80 mothers, 34 had Iron deficiency anemia and their Hb levels were below
9.0 gm/d1. Pregnant women had significantly lower Iron and Zinc levels while Copper and Total Iron Binding Capacity (TIBC) were significantly
higher (P<0.001). Newborns had significantly elevated Iron and Zinc levels and low levels of Copper and TIBC as compared to
their mothers irrespective of Iron deficiency anemia. Micronutrient status of newborn was found to be dependent on their mother's
micronutrient status. Besides, results also suggest micronutrient interactions, which are reflected in Iron/Zinc, Iron/Copper
and Zinc/Copper ratios. In view of this, there is need for proper, adequate and balanced micronutrient supplementation during
pregnancy to affect a healthy outcome. 相似文献
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94.
为优化谷朊粉水解物与锌的螯合工艺,以谷朊粉水解物为原料,七水硫酸锌作为锌源,通过单因素实验与正交实验研究了谷朊粉水解物与锌离子质量比、微波螯合时间、微波螯合功率、反应液p H对螯合反应的影响。经研究确定最佳螯合条件为:微波螯合功率为350W,微波螯合时间为8min,谷朊粉水解物与锌离子质量比为3∶1,反应液p H为8.0,该条件下螯合率为74.2%。 相似文献
95.
采用溶胶凝胶法制备掺铝氧化锌粉末,通过控制铝盐的添加量来制备不同掺杂比例的掺铝氧化锌粉末,使用XRD来测试铝是否掺杂在氧化锌的晶格中,利用SEM来反映掺铝氧化锌粉末的外观以及颗粒分布聚集情况,用激光粒度分布仪来测其颗粒大小。并用所制备的氧化锌粉末样品对甲基红和溴甲酚绿进行光催化,使其降解,通过观察降解的效果,选择最佳的掺杂比例。结果表明,铝元素是掺杂在晶体中,且掺铝摩尔比为5%,煅烧温度为500℃,煅烧时间为3 h,其降解甲基红、溴甲酚绿效率最高。 相似文献