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1.
Katalytische Epoxidierung und 1,2‐Dihydroxylierung von Olefinen mit Bispidin‐Eisen(II)/H2O2‐Systemen
2.
A recently developed formula [R. Bukowski and B. Jeziorski, Phys. Rev. A46 (1992) 5437]. has been applied to estimate the soft-photon Lamb shift contribution to the energies of the muonic molecules pp, dd, tt, pd, pt and dt. The corresponding corrections to the dissociation energies for the excited P states of dd and dt have been found to be almost identical and equal to 0.048 meV. The magnitude of this stabilizing effect is too small to affect seriously the formation rates predictions. 相似文献
3.
4.
Andrzej Bukowski Stanislaw Porejko 《Journal of polymer science. Part A, Polymer chemistry》1970,8(9):2491-2500
Polyamide 6 in the form of film was grafted by gaseous carbon suboxide in the form of toluene solutions. The influence of temperature on the extent of grafting was studied. It was concluded that in a sufficiently high temperature a copolymer of high structure appears. The influence of substances that initiate homopolymerization of suboxide upon the course of grafting reaction was studied. It was found that the substances do not increase the effectiveness of grafting. However a significant increase of effectiveness of grafting is produced by introducing into the reaction environment some small quantities of methanol. By the addition of methanol a graft copolymer of a maximum effectiveness of 43.1% was obtained. The copolymer was subjected to further tests and appeared to be c.l. poly(amide-6–g-carbon suboxide). Additional tests indicated that the polyamide film graft with carbon suboxide shows some interesting properties. 相似文献
5.
A new method of generating flexible-monomer intermolecular interaction potentials has been proposed. The method, based on symmetry-adapted perturbation theory, extends a rigid-monomer potential into a flexible-monomer one at a cost negligible compared to performing calculations on a full-dimensional grid (i.e., including internal degrees of freedom of monomers). The non-rigidity effects are accounted for by density-overlap integrals and by asymptotic expansion coefficients. Results for a model system (Ar-HF) demonstrate that the method recovers a substantial portion of these effects. 相似文献
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7.
Subbiah Meenakshisundaram RM. Sockalingam 《Journal of molecular catalysis. A, Chemical》2000,160(2):269-275
Catalytic activity of Os(VIII) in the oxidation of some twenty organic sulfides with sodium salt of N-chlorobenzenesulfonamide (CAB) has been investigated in alkaline (pH8.7) t-butanol–water (1:1 v/v) medium. Significant retarding influence of [OH−] on the reactivity is exhibited. The catalysed reaction is strongly accelerated in the presence of Hg(II). Imperfections are observed in the linear Hammett relationship in the case of –NO2 substituents. 相似文献
8.
D. Wardecki R. Przeniosło A. N. Fitch M. Bukowski R. Hempelmann 《Journal of nanoparticle research》2011,13(3):1151-1161
The microstructure of electrodeposited nanocrystalline chromium (n-Cr) was studied by using synchrotron radiation (SR) diffraction,
SEM, TEM, and EDX techniques. The as-prepared n-Cr samples show the standard bcc crystal structure of Cr with volume-averaged
column lengths varying from 25 to 30 nm. The grain growth kinetics and the oxidation kinetics were studied by time resolved
SR diffraction measurements with n-Cr samples annealed at 400, 600, and 800 °C. The grain growth process is relatively fast
and it occurs within the first 10 min of annealing. The final crystallite size depends only on the annealing temperature and
not on the initial grain size or on the oxygen content. The final volume-averaged column lengths observed after 50 min annealing
are 40(4), 80(1), and 120(2) nm for temperatures 400, 600, and 800 °C, respectively. It is shown that annealing ex situ of
n-Cr at 800 °C both under vacuum and in air gives a grain growth process with the same final crystallite sizes. The formation
of the Cr2O3 and CrH phases is observed during annealing. 相似文献
9.
J. Kierzek B. Małożewska-Bućko P. Bukowski J. L. Parus A. Ciurapiński S. Zaraś B. Kunach K. Wiland 《Journal of Radioanalytical and Nuclear Chemistry》1999,240(1):39-45
Gamma-ray spectrometry (GS), energy dispersive X-ray fluorescence (EDXRF) analysis methods and wavelength dispersive X-ray
fluorescence (WDXRF) were applied for the studies of some coal components, e.g., sulphur, light and heavy metal element concentrations
and naturally occurring radioactive isotope contents. Hundred fifty coal samples originating mostly from eight different coal
mines from Upper Silesian Coal Basin and 150 samples of ash obtained from these coal samples in laboratory by total combustion
at final temperature of 820°C, were analyzed. Such comparitive analyses can be helpful in selection of most suitable kind
of coal for burning in electrical power and heat plants to minimize the environmental pollution. 相似文献
10.