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排序方式: 共有71条查询结果,搜索用时 15 毫秒
1.
Ksenija Radotic Smilja Todorovic Joanna Zakrzewska Milorad Jeremic 《Photochemistry and photobiology》1998,68(5):703-709
The structure of the polymer synthesized by UV irradiation of coniferyl alcohol was studied, using UV-visible, Raman, IR, H-NMR and 13C-NMR spectroscopy. The photochemical polymer was compared with the structure of the polymer obtained by peroxidase-catalyzed polymerization of coniferyl alcohol. General similarity of the spectra of the two polymers was shown. However, differences in the fine structure of particular regions of the NMR spectra, as well as in certain bands in the Raman and IR spectra, could be explained through the various bond types and organization within the polymers. These results are consistent with molecular mass distribution of the polymers. Two fractions of enzymatic polymer correspond to the main two fractions of photochemical polymer. The later polymer has additional fractions that are probably the main reason for the observed spectral differences. 相似文献
2.
Dušica B. Stojanović Milorad Zrilić Radmila Jančić‐Heinemann Irena Živković Aleksandar Kojović Petar S. Uskoković Radoslav Aleksić 《先进技术聚合物》2013,24(8):772-776
New forms of hybrid multiaxial nanocomposites with enhanced mechanical and stab resisting properties are presented. This study is motivated by the lack of knowledge in the study of the multiaxial fabric nanocomposites with two modified thermoplastic matrices for antiballistic protection. Introduction of 5 wt.% silica nanoparticles in the composite of polyurethane/p‐aramid/poly (vinyl butyral) leads to significant improvement in mechanical properties, and the addition of silane as a coupling agents and glutaraldehyde as a crosslinking agents yielded maximal values of storage modulus, tensile modulus and anti‐stabbing properties for hybrid nanocomposites. Ballistic resistance testing and penetration depth of the hybrid nanocomposites were visualized using image analysis. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
3.
M. Davidović D. Arsenović M. Božić A. S. Sanz S. Miret-Artés 《The European physical journal. Special topics》2008,160(1):95-104
The momentum distributions associated with both the wave function of a particle behind a grating and the corresponding Bohmian
trajectories are investigated and compared. Near the grating, it is observed that the former does not depend on the distance
from the grating, while the latter changes with this distance. However, as one moves further apart from the grating, in the
far field, both distributions become identical. 相似文献
4.
Milorad Stojanovic 《Journal of solid state chemistry》2007,180(3):907-914
The eutectic 7.3:2.7 molar ratio mixture of calcium and zinc metal melts at 394 °C and was explored as a solvent for the growth of new intermetallic phases for potential use as hydrogen storage materials. The reaction of nickel in this molten mixture produces two new phases—the CaCu5-related structure CaNi2Zn3 (P6/mmm, a=8.9814(5) Å, c=4.0665(5) Å) and a new cubic structure Ca21Ni2Zn36 (Fd-3m, a=21.5051(4) Å). Palladium-containing reactions produced CaPd0.85Zn1.15 with the orthorhombic TiNiSi structure type (Pnma, a=7.1728(9) Å, b=4.3949(5) Å, c=7.7430(9) Å). Reactions of platinum in the Ca/Zn mixture produce Ca6Pt3Zn5, with an orthorhombic structure related to that of W3CoB3 (Pmmn, a=13.7339(9) Å, b=4.3907(3) Å, c=10.7894(7) Å). 相似文献
5.
We show that with the help of the two well known Einstein assumptions used by him in the treatment of geometry on relativistically rotating disc, and elementary logical analysis only, two different and opposite models of rotating discs can be constructed: In one of them the disc, set rotating from the stationary state, changes neither its radius nor circumference, as measured from stationary inertial frame; while in the other both the radius and the circumference contract by the same Lorentz factor. We also show that one can construct discs whose contraction factors vary continuously from unity (no contraction) to the full Lorentz factor. 相似文献
6.
Milorad Z. Jowitschitsch 《Monatshefte für Chemie / Chemical Monthly》1913,34(1):225-242
Ohne Zusammenfassung 相似文献
7.
8.
We present transfer length method measurements of the contact resistance between Cu and graphene, and a method to significantly reduce the contact resistance by vacuum annealing. Even in samples with heavily contaminated contacts, the contacts display very low contact resistance post annealing. Due to the common use of Cu, and its low chemical reactivity with graphene, thermal annealing will be important for future graphene devices requiring non-perturbing contacts with low contact resistance. 相似文献
9.
V. A. Andreev D. M. Davidović L. D. Davidović Milena D. Davidović Miloš D. Davidović 《Theoretical and Mathematical Physics》2017,192(1):1080-1096
We consider scale transformations (q, p) → (λq, λp) in phase space. They induce transformations of the Husimi functions H(q, p) defined in this space. We consider the Husimi functions for states that are arbitrary superpositions of n-particle states of a harmonic oscillator. We develop a method that allows finding so-called stretched states to which these superpositions transform under such a scale transformation. We study the properties of the stretched states and calculate their density matrices in explicit form. We establish that the density matrix structure can be described using negative binomial distributions. We find expressions for the energy and entropy of stretched states and calculate the means of the number-ofstates operator. We give the form of the Heisenberg and Robertson–Schrödinger uncertainty relations for stretched states. 相似文献
10.
Daniela Ž. Popović Jelena Miladinović Milica D. Todorović Milorad M. Zrilić Joseph A. Rard 《Journal of solution chemistry》2011,40(5):907-920
The osmotic coefficients of K2HPO4(aq) have been measured at T=298.15 K by the isopiestic vapor pressure method over the range of molalities from 1.3846 mol⋅kg−1 to 13.939 mol⋅kg−1 (oversaturation) with CaCl2(aq) as the reference solution. The molalities and osmotic coefficients of saturated solutions in equilibrium with K2HPO4⋅xH2O(cr) were measured simultaneously by the same method. Available literature osmotic coefficients of K2HPO4(aq) at T=298.15 K, and our new experimental data, were combined and modeled using an extended form of Pitzer’s equation and the Clegg-Pitzer-Brimblecombe
equation based on the mole-fraction-composition scale. These equations were used to calculate the activity coefficients of
K2HPO4(aq) at T=298.15 K. 相似文献