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排序方式: 共有62条查询结果,搜索用时 15 毫秒
1.
A. S. Komolov E. F. Lazneva N. B. Gerasimova Yu. A. Panina A. V. Baramygin G. D. Zashikhin 《Physics of the Solid State》2016,58(6):1257-1261
The results of the investigation of the electronic structure of the conduction band in the energy range 5–25 eV above the Fermi level EF and the interfacial potential barrier upon deposition of aziridinylphenylpyrrolofullerene (APP-C60) and fullerene (C60) films on the surface of the real germanium oxide ((GeO2)Ge) have been presented. The content of the oxide on the (GeO2)Ge surface has been determined using X-ray photoelectron spectroscopy. The electronic properties have been measured using the very low energy electron diffraction (VLEED) technique in the total current spectroscopy (TCS) mode. The regularities of the change in the fine structure of total current spectra (FSTCS) with an increase in the thickness of the APP-C60 and C60 coatings to 7 nm have been investigated. A comparison of the structures of the FSTCS maxima for the C60 and APP-C60 films has made it possible to reveal the energy range (6–10 eV above the Fermi level EF) in which the energy states are determined by both the π* and σ* states and the FSTCS spectra have different structures of the maxima for the APP-C60 and unsubstituted C60 films. The formation of the interfacial potential barrier upon deposition of APP-C60 and C60 on the (GeO2)Ge surface is accompanied by an increase in the work function of the surface Evac–EF by the value of 0.2–0.3 eV, which corresponds to the transfer of the electron density from the substrate to the organic films under investigation. The largest changes occur with an increase in the coating thickness to 3 nm, and with further deposition of APP-C60 and C60, the work function of the surface changes only slightly. 相似文献
2.
Komolov A. S. Lazneva E. F. Gerasimova N. B. Sobolev V. S. Panina Yu. A. Pshenichnyuk S. A. Asfandiarov N. L. Handke B. 《Physics of the Solid State》2020,62(7):1245-1250
Physics of the Solid State - The formation of unoccupied electronic states and the boundary potential barrier during thermal deposition of tetracyanoquinodimethane (TCNQ) films to 7 nm in thickness... 相似文献
3.
In total current spectroscopy (TCS) a beam of low energy (0–15 eV) electrons is directed upon a solid sample and secondary electron emission investigated by monitoring the current to the target, rather than by direct energy analysis of emitted electrons. A TCS signal is the derivative of the direct current with respect to the incident energy E1 displayed as a function of that energy, and obtained experimentally in ultra high vacuum conditions using simple modulation and lock in amplification techniques. A typical experimental arrangement is described and factors influencing a typical spectrum outlined. A simple background theory is discussed and it is shown how TCS is a powerful tool for studying not only the surface and near surface regions, but also bulk physics. In particular the technique has already found application in studies of work function, chemi- and physisorption, epitaxy, interband transitions, densities of states, excitons, impurity atom excitation, plasmons, radiation damage and the measurement of thicknesses of very thin surface layers. 相似文献
4.
JOSEF MÁLEK JINDŘICH NEČAS K. R. RAJAGOPAL 《Archive for Rational Mechanics and Analysis》2002,165(3):243-269
To describe the flows of fluids over a wide range of pressures, it is necessary to take into account the fact that the viscosity
of the fluid depends on the pressure. That the viscosity depends on the pressure has been verified by numerous careful experiments.
While the existence of solutions local-in-time to the equations governing the flows of such fluids are available for small,
special data and rather unrealistic dependence of the viscosity on the pressure, no global existence results are in place.
Our interest here is to establish the existence of weak solutions for spatially periodic three-dimensional flows that are
global in time, for a large class of physically meaningful viscosity-pressure relationships.
(Accepted May 1, 2002) Published online November 15, 2002
Communicated by S. S. ANTMAN 相似文献
5.
Konstantin E. Komolov Mònica Aguilà Darwin Toledo Joan Manyosa Pere Garriga Karl-Wilhelm Koch 《Analytical and bioanalytical chemistry》2010,397(7):2967-2976
Surface plasmon resonance spectroscopy allows the study of protein interaction dynamics in real-time. Application of this
technique to G-protein coupled receptors, the largest family of receptors involved in signal transduction, has been complicated
by their low level of expression and the critical dependence of their native conformation on the hydrophobic transmembrane
lipid environment. Here, we investigate and compare three different strategies to immobilize rhodopsin, a prototypical G-protein
coupled receptor on a sensor chip surface using antibodies and a lectin for receptor capturing. By further probing of different
experimental conditions (pH, detergent type) we identified the optimal factors to maintain rhodopsin in a functional conformation
and extended this approach to recombinant rhodopsin that was heterologously expressed in COS cells. Functional operation of
rhodopsin on the sensor chip surface was proven by its activation and subsequent light-stimulated G-protein coupling. The
influence of these experimental parameters on the association and dissociation kinetics of G-protein receptor coupling was
determined. Thereby, we found that the kinetics of Gt interaction were not changed by the strategy of immobilization or the type of detergent. Regeneration of opsin directly on
a chip allowed recycling of the immobilized native and recombinant receptor. Thus, the approach provides an experimental framework
for choosing the most suitable conditions for the solubilization, immobilization, and for functional tests of rhodopsin on
a biosensor surface. 相似文献
6.
V. L. Komolov 《Technical Physics》1997,42(5):499-503
An investigation is made of the conditions for the nucleation of optical breakdown in transparent material when recombination-stimulated
defect-formation reactions occur in it. It is shown that a positive feedback between the conduction electron concentration
and point defects activates defect formation even if the medium is not heated. Under real conditions, where heating of the
medium by the light is important, lowering of the activation barrier by thermal defect generation aided by conduction electrons
results in optical breakdown of the medium at light intensities much lower than predicted in the classical “semiconductor”
or “thermochemical” models of thermal breakdown. The analysis confirms that optical breakdown of transparent condensed media
is due to electron-aided defect formation reactions over a broad range of illumination conditions.
Zh. Tekh. Fiz. 67, 48–53 (May 1997) 相似文献
7.
A waveguide in integrated optics is defined by its refractiveindex. The guide is assumed to be invariant in the propagationdirection while in the transverse direction it is supposed tobe a compact perturbation of an unbounded stratified medium.We are interested in the modes guided by this device, whichare waves with a transverse energy confined in a neighbourhoodof the perturbation. Our goal is to analyse the existence of such guided modes. Underthe assumptions of weak guidance the problem reduces to a two-dimensionaleigenvalue problem for a scalar field. The associated operatoris unbounded, selfadjoint, and bounded from below. Its spectrumconsists of the discrete spectrum corresponding to the guidedmodes and of the essential spectrum corresponding to the radiationmodes. We present existence results of guided modes and an asymptoticstudy at high frequencies, which shows that contrarily to thecase of optical fibers, the number of guided modes can remainbounded. The major tools are the min-max principle and comparisonof results between different eigenvalue problems. The originalityof the present study lies in the stratified character of theunbounded reference medium. 相似文献
8.
Jay Jin Saranya Kittanakom Victoria Wong Beverly AS Reyes Elisabeth J Van Bockstaele Igor Stagljar Wade Berrettini Robert Levenson 《BMC neuroscience》2010,11(1):33
Background
Opioid agonist drugs produce analgesia. However, long-term exposure to opioid agonists may lead to opioid dependence. The analgesic and addictive properties of opioid agonist drugs are mediated primarily via the mu-opioid receptor (MOR). Opioid agonists appear to alter neuronal morphology in key brain regions implicated in the development of opioid dependence. However, the precise role of the MOR in the development of these neuronal alterations remains elusive. We hypothesize that identifying and characterizing novel MOR interacting proteins (MORIPs) may help to elucidate the underlying mechanisms involved in the development of opioid dependence. 相似文献9.
A theoretical interpretation is given of the fine structure in the total-current spectra obtained from the (0001) plane of
MoS2, ZrS2, and NbSe2 single crystals. The calculations took into account the energy dependences of band energy-level broadening and of the density
of unfilled electronic states which become occupied by electrons entering a solid. The dominant contribution of the bulk band
structure to the spectra is demonstrated.
Fiz. Tverd. Tela (St. Petersburg) 41, 1875–1878 (October 1999) 相似文献
10.
P. V. Shibaev M. S. Arzhakov K. Schaumburg R. Vinokur T. Bjornholm D. Greve A. Komolov K. Norgaard 《Journal of Polymer Science.Polymer Physics》1999,37(21):2909-2917
Blends of poly(3-dodecyl thiophene) (PDDT) with poly(methyl methacrylate), poly(butyl methacrylate) (PBMA), and poly(methyl methacrylate-co-butyl methacrylate) (PMMA/PBMA) were studied by polarization optical microscopy, atomic-force microscopy, and absorption spectroscopy and were modeled using molecular dynamics (MD) simulations. The observed thermochromic transitions are shown to be host-matrix dependent, with PDDT/PBMA absorption spectra differing substantially from pristine PDDT. The dispersion of PDDT within PBMA matrix is observed to be greater than in the other host polymers. MD calculations of both individual PDDT molecules and molecular aggregates suggest that the distribution of dihedral angles present in the PDDT backbone is the narrowest for aggregates of PDDT embedded within a polymer matrix. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 2909–2917, 1999 相似文献