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21.
P.V. Chliapnikov V.M. Kubic V.M. Perevoztchikov A.M. Rubin O.G. Tchikilev A.P. Vorobjev G. Ciapetti W. Dunwoodie Y. Goldschmidt-Clermont A. Grant V. Iarba A. Stergiou J. Tuominiemi J.B. Kinson M. Jobes K.M. Storr D. Watkins E. De Wolf R. Windmolders 《Physics letters. [Part B]》1976,60(2):218-220
We present an analysis of the reaction K+p → K0 + anything at incident momenta of 5, 8.2 and 16 GeV/c in terms of the Björken variables gw and x. Assuming dominance of ? exchange, we derive the structure function F2(x, y) which is found similar to the one obtained in deep inelastic electroproduction. 相似文献
22.
Zoran Andelkovic Gerhard Birkl Svetlana Fedotova Volker Hannen Frank Herfurth Kristian König Nikita Kotovskiy Bernhard Maaß Jonas Vollbrecht Tobias Murböck Dennis Neidherr Wilfried Nörtershäuser Stefan Schmidt Manuel Vogel Gleb Vorobjev Christian Weinheimer 《Hyperfine Interactions》2015,231(1-3):37-44
Heavy few-electron ions are relatively simple systems in terms of electron structure and offer unique opportunities to conduct experiments under extremely large electromagnetic fields that exist around their nuclei. However, the preparation of highly charged ions (HCI) has remained the major challenge for experiments. As an extension of the existing GSI accelerator facility, the HITRAP facility was conceived as a multi-stage decelerator for HCI produced at high velocity. It is designed to prepare bunches of around 105 HCI and to deliver them at low energies to various experiments. One of these experiments is SpecTrap, aiming for laser spectroscopy of trapped, cold HCI. We present the latest results on deceleration of ions in a radio-frequency quadrupole, synchrotron cooling of electrons in a trap as a preparation step for the prospective electron cooling of the HCI decelerated in HITRAP, as well as laser cooling of singly charged Mg ions for sympathetic cooling of HCI in SpecTrap. 相似文献
23.
24.
Yury N. Vorobjev 《Journal of computational chemistry》2012,33(8):832-842
An advanced implicit solvent model of water–proton bath for protein simulations at constant pH is presented. The implicit water–proton bath model approximates the potential of mean force of a protein in water solvent in a presence of hydrogen ions. Accurate and fast computational implementation of the implicit water–proton bath model is developed using the continuum electrostatic Poisson equation model for calculation of ionization equilibrium and the corrected MSR6 generalized Born model for calculation of the electrostatic atom–atom interactions and forces. Molecular dynamics (MD) method for protein simulation in the potential of mean force of water–proton bath is developed and tested on three proteins. The model allows to run MD simulations of proteins at constant pH, to calculate pH‐dependent properties and free energies of protein conformations. The obtained results indicate that the developed implicit model of water–proton bath provides an efficient way to study thermodynamics of biomolecular systems as a function of pH, pH‐dependent ionization‐conformation coupling, and proton transfer events. © 2012 Wiley Periodicals, Inc. 相似文献
25.
V. A. Shalygin L. E. Vorobjev D. A. Firsov A. N. Sofronov G. A. Melentyev M. Ya. Vinnichenko V. V. Lundin A. E. Nikolaev A. V. Sakharov A. F. Tsatsul’nikov 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(2):207-210
The emission of terahertz radiation from a AlGaN/GaN heterostructure under the heating of two-dimensional electrons in a lateral
electric field is studied. The field dependence of the temperature of hot electrons is determined from an analysis of experimental
volt-ampere characteristics. A theoretical model of the thermal radiation of hot two-dimensional electrons is considered,
and the calculation results are compared with an experiment on terahertz radiation emission. 相似文献
26.
P. E. Vorobjev I. A. Pyshnaya E. Wickstrom V. F. Zarytova 《Russian Chemical Bulletin》2002,51(7):1187-1189
It was demonstarted for the first time that RNA can be subjected to site-specific oxidative cleavage induced by the glycopeptide antibiotic bleomycin A5 (Blm) covalently linked to the 3"-terminus of an oligodeoxyribonucleotide through two, three, or four residues of hexaethylene glycol phosphate (p-heg)
n
. The oligonucleotide conjugate with bleomycin forms an imperfect complementary complex with the RNA to be cleaved (5"-prCGGAGUUGGAAAACAAUGAAAAGGCCCCCA/Blm-(p-heg)
n
-3"-pdGCCTCACCTTTTGTTA). The cleavage occurs at the only nucleotide residue (U) preceding a one-nucleotide bulge in the RNA chain, which is formed due to imperfect complementarity between the oligodeoxyribonucleotide and the RNA to be cleaved. 相似文献
27.
The experimental results obtained by the investigation of stimulated FIR emission from dopedp-type germanium andp-type silicon by hot holes in crossedE andH fields at = 10 and 80 K are reported. The analysis of the emission intensity fromp-type germanium as a function ofE andH fields permits us to draw a conclusion about the important role of quantization of the energy spectrum of light holes and the contribution of light hole transitions with n = 2 to the amplification of FIR radiation. A new region of generation is demonstrated inp-type germanium under uniaxial stress. The first experimental results on stimulated FIR emission fromp-type silicon are reported. 相似文献
28.
E. A. De Wolf J. J. Dumont F. Verbeure I. V. Ajinenko P. V. Chliapnikov V. P. Falaleev L. N. Gerdyukov A. E. Kurnosenko V. N. Riadovikov V. F. Tchumikin V. A. Uvarov A. P. Vorobjev F. Grard CERN-Soviet Union Collaboration 《Zeitschrift fur Physik C Particles and Fields》1982,12(2):105-112
Results are presented on inclusive production of resonant and non-resonant particle systems produced inK + p interactions at 32 GeV/c. We compareK *+(892), \(\bar \Sigma ^{ * - } \) (1385), Σ*±(1385), and ?0 inclusivex-spectra with the ones of non-resonantK s 0 π±, \(\bar \Lambda \pi ^ - \) , Λπ± and π+π? pairs at the same effective mass. Resonance-particle pairsK *+π±, Σ*+π?, and \(\bar \Sigma ^{ * - } \pi ^ - \) are also studied together with non-resonant tripletsK s 0 π±, Λπ+π?, \(\bar \Lambda \pi ^ - \pi ^ - \) . The invariantx-spectra of resonant particle pairs decrease less rapidly withx then the corresponding non-resonant pairs. Comparison with quark-recombination predictions indicates that the particles, resonances and multiparticle systems are probably created off a single valence quark or diquark instead of carrying all possible valence-quarks. 相似文献
29.
A. Givernaud D. Denegri C. Lewin M. Loret L. Mosca J. Saudraix U. Gensch M. Walter M. Barth M. Van Immerseel F. Verbeure C. Dujardin R. Windmolders M. Yu. Bogolubski P. V. Chliapnikov M. S. Levitski D. I. Patalakha R. N. Riadovikov V. F. Tchunikhin A. P. Vorobjev B. Buschbeck H. Dibon M. Markytan J. Mac Naughton France-Soviet Union Collaboration CERN-Soviet Union Collaboration 《Zeitschrift fur Physik C Particles and Fields》1981,8(4):291-311
We present results of an investigation of diffraction dissociation in exclusive channels inK ± p interactions at 32 GeV/c. Total cross sections are determined forK ±→K ±π+π?,K ±2π+2π?,K 0π±π± K ±2π+π?,K ± K + K ?,K ±p \(\bar p\) , \(\bar \Lambda \) p, andp→pπ +π?,p2π+2π?,pK +K?,ΛK +,ΛK +π+π? dissociation modes, ranging from a high of ? 300 μb to ~ 3 μb. Thedσ/dt′ differential cross sections of most of the systems studied exhibit structure, with breaks of slope att′ ~ 0.2 to 0.5 GeV2; some modes have a sharp forward spike with a slope exceeding 10 GeV?2. A systematic investigation of two-body dissociation modesK→A+B andp→A′+B′ shows that these cross sections decrease with increasing threshold massM A+M B, that they are comparable for kaon and proton dissociations at similar diffractive excitation masses and are systematically suppressed by a factor 3–4 for dissociations requiring an \(s\bar s\) quark pair creation when compared to \(u\bar u\) pair creation indicating a breakdown ofSU 3 symmetry for the \(q\bar q\) sea. 相似文献
30.
P. V. Chliapnikov L. N. Gerdyukov V. V. Kniazev V. N. Riadovikov A. M. Rybin O. G. Tchikilev V. F. Tchunikhin V. A. Uvarov A. P. Vorobjev M. Barth E. De Wolf M. Gijsen F. Verbeure C. Dujardin F. Grard R. Windmolders CERN-Soviet Union Collaboration 《Zeitschrift fur Physik C Particles and Fields》1980,3(4):285-287
Evidence is provided for a new resonance in theK s 0 K s 0 π+π? system with a mass of 1.97±0.01 GeV and width 40±20 MeV. It is produced with an inclusive cross section of ~6μb in the beam fragmentation process of 4-prongK + p interactions with at least 2 associatedV 0's at 32 GeV/c and decays dominantly into theK * ± (892)K s 0 π? mode. 相似文献