共查询到20条相似文献,搜索用时 15 毫秒
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本文研究了新试剂 N,N′-双 (2 -水杨醛缩氨基苯基 ) 1,3-丙二酸二酰胺 (H2 Sapma)与锌的灵敏显色反应。在 p H为 7.0— 7.8的硼砂 - HCl缓冲溶液中。配合物的组成比是 Zn∶H2 Sapma=1∶ 1,配合物的最大吸收波长在 4 10 nm处 ,表观摩尔吸光系数为 1.6 9× 10 4L· mol-1· cm-1,锌量在 0— 4 0μg/2 5 m L范围内符合比耳定律。用于测定人发及强化营养盐中微量锌 ,结果令人满意。 相似文献
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We have obtained two types of two-dimensional similarity reductions for the (2 1)-dimensional Klain-Gordon system using the standard classical Lie group approach with computer algebra.The well-known one-dimension al reductions,radial and travelling reductions are equivalent to the two special cases of our general two-dimensional reductions. 相似文献
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利用溶胶-凝胶法合成了K9[Sb1W9O33],用十六烷基三甲基溴化铵(CTAB)对K9[Sb1W9O33]改性,得到了(CTAB)9[Sb1W9O33],以过氧化氢氧化环己醇制取环己酮为探针反应,考察了n(Sb)∶n(W)对催化剂催化活性的影响,评价结果表明:催化剂金属原子配比n(Sb)∶n(W)=1∶9,催化活性最高,在该条件下,环己酮的选择性达到了最大值99.2%。通过XRD、FT IR的检测,揭示了(CTAB)9[Sb1W9O33]的微观结构和内在规律性,[Sb1W9O33]9-与CTAB+之间存在协同效应,实验结果为工业装置的技术改造提供了较好的实验依据。 相似文献
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New Coherent Structures in the Generalized(2+1)—Dimensional Nizhnik—Novikov—Veselov System 下载免费PDF全文
In high dimensions there are abundant coherent soliton excitations.From the known variable separation solutions for the generalized(2 1)-dimensional Nizhnik-Novikov-Veselov system.two kinds of new coherent structures in this system are obtained.Some interesting novel features of these structures are revealed. 相似文献
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应用 ̄1HNMR技术推定了新合成的二(3-取代X基-2,4-戊二酮).N-甲基乙二胺合钴(Ⅲ)配合物:[Co(Xacac)_2(Me-en)]ClO_4(X=CH_3、Cl、NO_2)的Δ(R)∧(S)和Δ(S)∧(R)异构体的空间构型,测定了各配合物异构体手性配位氮原子上的重氢化速率常数k_D值(34.0℃).结果表明,取代基X对k_D值有着显著影响。 相似文献
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李光源 《原子与分子物理学报》1994,(4)
此文以第四族元素第一激发态(np) ̄1[(n+1)s] ̄1为例,在(JM_J)表象中,建立新的单组态谱项能量表达式,添加a(J+1)校正项后,显著地改善谱项理论值与实验值拟合程度。 相似文献
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Moessbauer Studies on Spin Transition in Zinc Dilution Complexes [Fe1—xZnx(dpp)2(NCS)2]py(x=0.05—0.40) 下载免费PDF全文
A series of spin transition complexes [Fe1-xZnx(dpp)2(NCS)2]ph(x=0.05,0.10,0.15,0.20,0.25,and 0.40;py=pyridine) has been synthesized and studied by Moessbauer spectroscopy.The high-spin structure is frozen at room temperature,and the induced meta-stable high-spin phase by the so-called rapid cooling method is monitored by temperature and time-dependent Moessbauer spectra.The investigation on dynamic relaxation of the high-spin state to the low-spin state at 80-K reveals sigmoid behaviour and existence of cooperative effect for low diluted complexes.This cooperative effect is wrecked by the dilution of Zn(Ⅱ)ions in Fe(Ⅱ)ion sites,and relaxation curves gradually become to obey the first-order kinetics as the ratio of the dilution increases. 相似文献