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81.
Vezentsev A. I. Peristiy V. A. Bukhanov V. D. Peristaya L. F. Sokolovskiy P. V. Roessner F. Mikhailyukova M. O. Greish A. A. 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2018,92(9):1806-1812
Russian Journal of Physical Chemistry A - The use of the developed composite sorbent based on the plant wastes (sunflower seed husks) and montmorillonite clay was shown to be highly effective for... 相似文献
82.
L. A. Sinyaeva N. A. Belanova S. I. Karpov V. F. Selemenev F. Roessner 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(11):2254-2261
The possibility of predicting the breakthrough curves of a phospholipid (PL) during its sorption by mesoporous composites based on MCM-41 using models of the dynamics of sorption that consider the kinetics of adsorption (the Thomas model) and mixed diffusion (the asymptotic model) is demonstrated using phosphatidylcholine (PC) as an example. The effect the kinetic parameters have on the tailing of the sorption front with respect to the mixed diffusion limitation of the sorption of nonpolar biologically active substances (BASes) is shown. It is found that the ordered structure of composite materials based on MCM-41 ensures a high rate of mass transfer and thus little tailing of the sorption front, when compared to sorbents with a lower degree of order (silica gel and polymer materials) during the sorption of a phospholipid under dynamic conditions. Based on calculations of the parameter of pattern Λ under the conditions of the dynamic mode of sorption in mixed diffusion kinetics, it is shown that the sorption of phosphatidylcholine from hexane solutions by mesoporous composites based on MCM-41 allows the sorption chromatographic process to proceed in the most advantageous (quasi-equilibrium) mode. 相似文献
83.
We investigate Newton’s method to find roots of polynomials of fixed degree d, appropriately normalized: we construct a finite set of points such that, for every root of every such polynomial, at least
one of these points will converge to this root under Newton’s map. The cardinality of such a set can be as small as 1.11 d log2
d; if all the roots of the polynomial are real, it can be 1.30 d.
Oblatum 24-II-2000 & 14-II-2001?Published online: 20 July 2001 相似文献
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Steffen Weidner Gerhard Kühn Renate Decker Dierk Roessner Jrg Friedrich 《Journal of polymer science. Part A, Polymer chemistry》1998,36(10):1639-1648
The influence of different types of low and atmospheric pressure plasma on poly(ethylene terephthalate) (PET) has been studied in terms of changes in molar mass and molar mass distribution. Apart from a variation of plasma gases (oxygen, helium) different types of plasma (microwave, radio frequency, corona discharge) were used for the plasma surface modification. The changes in molar mass and types of functional end groups of lower molar mass products were investigated by means of matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOFMS), whereas the high-molar mass fraction was analyzed by means of size-exclusion chromatography (SEC). The formation of crosslinked products during exposure to a helium plasma, which emits preponderately energy-rich and intense ultraviolet radiation, was proved by means of thermal field-flow fractionation (ThFFF). This method combined with a multiangle laser light scattering (MALLS) detector allows detection of weakly crosslinked polymers and microgels. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 1639–1648, 1998 相似文献
89.
Nucleoside mediated Claisen condensation of malonates has been achieved under biomimetic weak acid conditions, pH 3 or 4, 0.15 M NaCl, and 0.125 M Mg2+. The result illustrates the catalyzing property of end-nucleosides of t-RNA in the RNA world. 相似文献