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171.
J. Miklósi P. Póczik I. Sytchev K. Papp G. Kaptay P. Nagy E. Kálmán 《Applied Physics A: Materials Science & Processing》2001,72(8):S189-S192
Carbon nanostructures have been synthesized in NaCl-MgCl2 and in NaCl-CaCl2 salt melts and the extracted material was investigated by tapping-mode atomic force microscopy (TM-AFM) and scanning electron microscopy. Some interesting new nanostructures were found and investigated as torus-shaped carbon structures with a ring diameter of 300-400 nm and 10-15 nm height. These tori are closely related to the wrapped SWNT rings described recently. They are probably formed during the electrolysis. A chain-like structure was also revealed. 相似文献
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Zoltán Pataj István Ilisz Róbert Berkecz Enikő Forró Ferenc Fülöp Antal Péter 《Procedia Chemistry》2010,2(1):116-119
High-performance liquid chromatographic methods were developed for the separation of the enantiomers of 19 β-lactams. The direct separations were performed on chiral stationary phases containing either amylose tris(3,5-dimethylphenylcarbamate), (Kromasil® AmyCoat? column) or cellulose tris(3,5-dimethylphenylcarbamate), (Kromasil® CelluCoat? column) as chiral selector. The different methods were compared in systematic chromatographic examinations. The separations were carried out with good selectivity and resolution. The AmyCoat? and CelluCoat? columns appear to be highly complementary. The best separations of bi- and tricyclic β-lactam stereoisomers were obtained with the AmyCoat? column, while the 4-aryl-substituted β-lactams were better separated on the CelluCoat? column. The elution sequence was determined in all cases; no general rule could be established. 相似文献
174.
Ferenc Sóti Mária Incze Zsuzsanna Kardos-Balogh Maária Kajtár-Peredy Csaba Szántay 《合成通讯》2013,43(12):1689-1698
7-Methoxytryptamine (6a) was prepared from cheap and easily available starting materials by using the Abramovitch-Shapiro method. 相似文献
175.
We study systematically the natural generalization of Schreier’s extension theory to obtain proper loops and show that this construction gives a rich family of examples of loops in all traditional common, important loop classes. 相似文献
176.
In a recent paper [4], Gogoladze and Meskhia generalized the classical results of Bernstein, Szász, Zygmund and others related to absolute convergence of single trigonometric Fourier series. Our aim is to extend these results from single to multiple Fourier series. To this effect, we introduce the notions of multiplicative moduli of continuity and that of smoothness. Multiplicative Lipschitz classes of functions in several variables, and functions of bounded s-variation in the sense of Vitali are also considered. 相似文献
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Gy. Vankó L. Bottyán D. L. Nagy E. Szilágyi A. Vértes 《Journal of Radioanalytical and Nuclear Chemistry》2000,246(1):97-100
Nuclear inelastic resonant scattering of synchrotron radiation was applied to the study solutions of 57Fe complexes. In order to reveal different inelastic contributions solutions of two different 57Fe complexes of different molecular dimensions with solvents of substantially different viscosities were studied. We argue that the only former experiment available in the literature overestimates the role of the diffusivity in affecting the spectrum. The first direct observation of an intramolecular vibrational transition assisting the nuclear resonance absorption in a liquid is reported. 相似文献