Materials Literature
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An analytical model of unsteady heat transfer in a one-dimensional harmonic crystal is presented. A nonlocal temperature is introduced as a generalization of the kinetic temperature. A closed equation determining unsteady thermal processes in terms of the nonlocal temperature is derived. For an instantaneous heat pert…
International audience
International audience
International audience
Currently Fibre-Glass (FG) is the most widely used reinforcement in polymer composites. However, GF or fibre (|rassijs very expensive and non-biodegradable hence the need for alternative reinforcement materials that are less expensive like natural fibres. Natural fibre reinforced polymers (NFRPs) are widely used in en…
Исследовано влияние замещения ионов Ca2+ в решётке ванадатоапатита (по схеме 2Me2+ = Ln3+ + A+; Ln = La, Nd, Sm, Gd, Ho; A = Li, Na, K, Rb, Cs) редкоземельными и щелочными металлами на закономерности формирования электронного строения кристаллов. Установлено, что при модифицировании редкоземельными металлами замещение…
Namen diplomskega dela je bil z mehanokemijsko metodo sintetizirati kovinske halkogenide, in sicer aluminijev sulfid, aluminijev selenid, galijev(III) sulfid ter galijev(III) selenid. Najprej smo z rentgensko praskovno difrakcijo analizirali reaktante, nato pa smo izbrane kovinske halkogenide poskusali sintetizirati z…
Differential cross sections (DCSs) for electron impact excitation of the 4 d 9 5 s 2 2 D 3/2 and 4d 10 6s 2 2 S 1/2 states of silver atom have been measured. Relative DCSs have been obtained by comparing intensities of these states relative to the resonant 2 P state at scattering angles from 10° to 150° and at electro…
We present Monte Carlo simulation of low energy electrons backscattered from iron (Fe) surface. We take into account both elastic and inelastic collisions during the simulation. In our simulations the primary electron energy is 150 eV and the incidence angle of the electron beam with respect to the surface is varied b…
In this work we want to assess the influence of nuclear dynamics on the features of the double corehole photoelectron and Auger spectra of small isolated molecules by performing wave packet propagation on precomputed ab initio potential energy surfaces.
The spatial distribution of electric charges forming a square well potential has been analyzed. It has been shown that two concentric spheres each with a double layer of charges create the potentials of this type. It has been demonstrated that the phenomenological potentials simulating the potential of C 60 shell belo…
Experimental and theoretical work was performed to investigate the guiding of 4.5- keV Ar 7+ ions through a conical macrocapillary. The bulk conductivity was varied by changing the capillary temperature from 24 - 110 °C. A minimum in the transmitted ion intensity was experimentally observed at forward direction, which…
A lepton spectrometer for the study of atomic processes in relativistic collisions of very heavy highly charged ions has been designed for experiments at the HESR storage ring at the FAIR facility.
The two-electron-one-photon Kαα x-rays emissions from 80 MeV Cu 9+ -Zn collisions have been measured. These Kαα x-rays originate from the projectile ions and target atoms. It indicates that double K-vacancies appear in both Cu 9+ ions and Zn atoms.
We introduce a model that represents ion-molecule net capture and ionization cross sections as weighted sums of atomic cross sections. The weights are determined geometrically by analyzing the overlaps of the atomic cross sections drawn as circular disks around the nuclear centers of the molecule in a plane that is pe…
N have received enormous attention for their potential applications in biology and medicine. A key issue in evaluating the utility of these materials is the assessment of their potential toxicity−either due to their inherent chemical composition or as a consequence of their nanoscale properties. Quantum dots are an ex…
Absolute cross sections (CSs) for vibrational excitation were obtained for low energy electron impact with tetrahydrofuran (THF) molecules condensed on Ar at 19K. The absolute CSs were measured with a high resolution electron energy loss spectrometer for the 1 to 19 eV incident electron energy range. The values of the…
The radiolysis of a mixture of acetone and nitrogen condensed at 13 K by 40-MeV 58 Ni 11+ ions was studied. The bombardment with heavy ions is highly efficient for inducing chemical reactions in ices. The dissociation rate of acetone mixed with nitrogen as a function of the fluence is determined from a sequence of inf…
In this work we study the transmission of charged particles through a single cylindrically shaped metallic capillary of microscopic dimensions with a large aspect ratio. We used electrons as projectiles. Our results suggest the existence of guiding of the electron beam by a metallic capillary.
Femtosecond x-ray induced fragmentation of Ho3N@C80, Xiong, H, Murphy, B, Fang, L, Osipov, T, Kukk, E, Guehr, M, Feifel, R, Petrovic, V S, Ferguson, K R, Bozek, J D, Bostedt, C, Frasinski, L J, Bucksbaum, P H, Castagna, J C, Berrah, N