排序方式: 共有64条查询结果,搜索用时 390 毫秒
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PICO-TAG反相色谱法测定鸡蛋中氨基酸含量 总被引:4,自引:0,他引:4
采用PICO-TAG反相色谱法测定了氨基酸,方法的相对标准偏差为0.75%,平均回收率为97.12%。对鸡蛋样品进行了测定,发现不同产地不同皮色鸡蛋中氨基酸含量无显著差异,样品测定相对标准偏差为1.67%。结果表明测定方法快速、灵敏、准确、重现性好。 相似文献
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在考察聚苯乙烯(PS)与聚乙烯基苄氯(PVBCl)相容性及干涉效应对测量结果影响的基础上,使用红外显微化学图像技术研究表征了PS与PVBCl混合物薄膜和微球的相分离情况,对比分析了不同处理条件下制备的微球半球壳中两种聚合物的相分离红外显微化学图像。研究结果表明建立的研究方法可以用来定性或半定量的分析球壳内PS和PVBCl两聚合物的分相情况,在测试中样品的干涉效应会对测量造成较大的不确定度,在不同温度下获得的聚合物微球样品中,40℃条件下两聚合物的分相情况更为理想。该研究为探索非均相双半球型聚合物微球制备条件以及红外显微化学图像法表征聚合物相分离提供了一种直观可行的表征方法,但受空间分辨率的影响,该方法不适合于6.25μm×6.25μm以下尺寸样品的分析。 相似文献
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Qiang He Yue Cui Sufen Ai Ying Tian Junbai Li 《Current Opinion in Colloid & Interface Science》2009,14(2):115-125
Combination of the layer-by-layer (LbL) technique with the porous template method has attracted significant interest as a versatile approach that has been used to prepare tubular nanomaterials with tailored properties. The process involves the sequential deposition of different species, such as polymers, nanoparticles, lipids, proteins, dyes and organic or inorganic small molecules into various porous templates, which are subsequently removed to yield free-standing nanotubes. At the same time, this approach permits the formation of composite nanotubes with the engineering features, including size, shape, composition and function. In this review, we summarize the synthesis and properties of various LbL-assembled composite nanotubes based on electrostatic attraction, hydrogen bonding, and covalent bonding. These assembled nanotubes possess potential application in biomedical fields such as bioseparations, biocatalysis, biosensor, and drug delivery. 相似文献
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采用光外差-磁旋转-速度调制吸收光谱技术, 在可见光波段范围16800~17573 cm-1, 对N2+的A 2Πu-X 2Σ+g(12,6)、(11,5)、(7,2)带和B 2Σ+u-X 2Σ+g (1,5)带进行了测量和分析,推导了双原子分子振转能级在受到微扰作用时的有效哈密顿量形式,并分析了N2+的A 2Πu-B 2Σ+u之间存在的微扰相互作用,通过与实验数据的拟合得到了精确的电子态微扰常数ξe、ηe . 相似文献
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采用光外差 磁旋转 速度调制吸收光谱技术 ,在可见光波段范围 16 80 0~ 175 73cm-1,对N2 + 的A2 Πu-X2 Σ+ g(12 ,6 )、(11,5 )、(7,2 )带和B2 Σ+ u -X2 Σ+ g(1,5 )带进行了测量和分析 ,推导了双原子分子振转能级在受到微扰作用时的有效哈密顿量形式 ,并分析了N2 + 的A2 Πu-B2 Σ+ u 之间存在的微扰相互作用 ,通过与实验数据的拟合得到了精确的电子态微扰常数 ξe、ηe. 相似文献
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采用酸性溶胶法在碳纳米管(CNT)上负载纳米TiO2颗粒,制备了CNT-TiO2修饰电极,利用TiO2与辣根过氧化物酶(HRP)间的静电吸附及TiO2与羧基的高反应特性,实现了HRP在CNT-TiO2修饰电极表面的固定.实验发现,该生物传感器对邻氨基苯酚过氧化氢溶液的氧化还原有很好的催化作用,利用苯肼对HRP的抑制作用实现了对环境污染物苯肼的检测.该生物传感器寿命长,性能稳定且可以重复使用. 相似文献
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为实现惯性约束聚变靶用空心玻璃微球的干凝胶法高效制备,从数值模拟和工艺实验两个方面研究了载气组份对干凝胶粒子炉内成球过程及最终空心玻璃微球性能的影响。结果表明:载气组份显著影响粒子/微球与载气之间的热量和质量传递过程,但载气组份对粒子/微球在炉内的下落速度影响很小;提高载气中氦气的体积分数可以显著提高干凝胶粒子在吸热阶段的升温速率,更为迅速有效地完成封装过程,这不仅使得干凝胶粒子发泡成为空心球的比例增大,而且还有利于制备得到大纵横比的空心玻璃微球;但是,在载气中保持适当体积分数的氩气,有利于提高玻璃微球的表面质量和成品率。当载气中氦气的体积分数在50%~80%时,干凝胶粒子的成球率较高,空心玻璃微球的球形度、同心度和表面粗糙度能满足制靶要求。 相似文献
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Achievement on Unwrapping High Cycle Density of Noisy Phase Maps for Digital Holographic Microscopy 下载免费PDF全文
Mingqing Wang Fang Li Ming Zheng Wei Lu Sufen Zhao Qingnan Yu Yan Jia Jian Wu 《Annalen der Physik》2018,530(5)
Phase unwrapping has been an important way to construct a 3‐dimensional image of the object in digital holographic microscopy. However, there is still a huge challenge currently on this technique at present, as it is still difficult to perfectly retrieve high wrapping density of phase maps which include different types of noise. This is because many details of high wrapping density of phase maps are buried in noise so that it is difficult to reconstruct them in digital holography. In order to solve this problem, a novel solution called I‐PUROR method is presented in this paper. In comparison to previous techniques, not only can the I‐PUROR algorithm effectively overcome the noise influence, but also reconstruct phase details very well in the phase unwrapping process. The experimental evaluation is fully consistent with theoretical analysis. It proves the validity of this new method. 相似文献