排序方式： 共有95条查询结果，搜索用时 578 毫秒
81.
通过制备以ZnO陶瓷为基体的ZnO陶瓷/Ag2O复合材料. 通过XRD、SEM的分析和基本物理量(密度和电阻率)、I-V特性的测量结果发现,银与氧化锌陶瓷之间并没有发生化学反应,致密度也不高. 但是,二者的复合使原来在2000 V/cm 下不显现非欧姆特性的氧化锌陶瓷具有了非欧姆特性,非线性系数α达8.4,此时银的质量分数约为20%. 相似文献
82.
实验采用原子吸收光谱法测定荸荠、莲藕、莲子中的铁、锌、钙的含量,在样品处理过程中,采用湿法消化法和干法灰化法这两种处理方法进行多元素的消解,并对这两种样品处理方法的操作效果及测定结果进行比较,在本实验的条件下,铁的线性关系是0．1～5．0 mg/L,检出限为0．19 mg/L;锌的线性关系是0．2～1．0 mg/L,检出限为0．04 mg/L;钙的线性关系是0．5～14．0 mg/L,检出限为0．22 mg/L．回收率在90．6%～103．2%范围内． 相似文献
83.
余萍 《岳阳职业技术学院学报》2007,22(3):68-70
近年来,微量元素锌的作用及其对儿童生长发育的重要性越来越受到人们的重视和关注。补锌儿童也越来越多。为了保障并促进儿童身心健康的发展,除了配给结构合理的膳食外,还应科学、合理、有针对性地给儿童补充锌制剂。 相似文献
84.
本文应用空气——乙炔火焰原子吸收法连续测定人发中钙、铁、锌、铜的含量。在地区有关部门的帮助下,我们对我市100余名童发进行了上述元素的测定。测定方法的回收率为92％——107％,变异系数小于2％,结果令人满意。 相似文献
85.
M. M. Goyal A. K. Kalwar R. K. Vyas A. Bhati 《Indian journal of clinical biochemistry : IJCB》2006,21(1):208-210
The association of serum trace elements like selenium, zinc and copper has been found in different types of cancer. This study
was conducted to see the serum level of these three trace elements in cancer esophagus patients. Biopsy confirmed cancer esophagus,
24 patients (12 males, 12 females, mean age 54.5±11.65 year with 23 healthy subjects (16 males, 7 females, mean age 44 ±13.82
years) were included in this study. Both control and study group patients were of same socio-economic status and dietary habits.
Serum zinc and copper level were estimated using standard absorption spectrometer technique and serum selenium by Hydride
generation method.
We observed significant low serum levels of zinc and selenium while high level of serum copper in carcinoma esophagus patients,
as compared with normal healthy controls. This shows an association of serum selenium zinc and copper with cancer esophagus. 相似文献
86.
选择 1 40只性成熟健康的七彩山鸡 ,按公母比例 1 :6随机分成 4组 ,分别为试验Ⅰ、试验Ⅱ和试验Ⅲ组和对照组 (Ⅳ ) ,每组 35只。研究了日粮添加不同水平的锌对七彩山鸡种蛋性能的影响。结果表明添加锌的 3个试验组和对照组相比 ,种蛋受精率和孵化率均显著提高。表明添加锌有利于提高七彩山鸡的种蛋性能。 相似文献
87.
88.
本文研究了锌、铁、铜在苯基荧光酮－Ｔｒｉｔｏｎｘ－１００体系中的析相显色反应及适宜条件，在析相光度法有选择性分离和富集的基础上，运用主成分分析法，消除配合和的吸收光谱严重重叠的干扰，达到不经分离同时测定锌，铁，铜的目的，取得了满意的结果。 相似文献
89.
《文物保护研究》2012,57(1):14-27
ABSTRACTZinc (carboxylate) soaps, formed by reactions between zinc oxide (ZnO) and fatty acids in a drying oil, are known to cause deterioration in the paint layers of modern and contemporary oil paintings. This study investigates zinc carboxylates that developed in an oil painting test panel designed to mimic the aging and degradation encountered in actual works of art. Following accelerated and natural aging, protrusions were noted on the surface of the test panel. A large protrusion with erupted gel features was extracted from the test panel, mounted in top view, and then cut to reveal the sample's cross section. The gel features, which resulted from the unreacted oil binder's separation from the paint matrix, facilitated zinc carboxylate formation. Using reflectance µ-FTIR and SEM-EDX analysis, the morphologies and spatial distributions of zinc carboxylates within the gel regions of the protrusion were studied. A concentration gradient of zinc within the gel material was observed in the cross-sectional view, indicating patterns of zinc carboxylate formation and migration. 相似文献
90.
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