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排序方式: 共有39条查询结果,搜索用时 15 毫秒
1.
I. G. Alekseev P. E. Budkovsky V. P. Kanavets L. I. Koroleva B. V. Morozov V. M. Nesterov V. V. Ryltsov D. N. Svirida A. D. Sulimov V. V. Zhurkin Yu. A. Beloglazov A. I. Kovalev S. P. Kruglov D. V. Novinsky V. A. Shchedrov V. V. Sumachev V. Yu. Trautman N. A. Bazhanov E. I. Bunyatova 《Physics of Atomic Nuclei》2002,65(2):220-228
New experimental data on the spin-rotation parameters A and R measured for elastic π ± p scattering in the resonance region and on the asymmetry in pC scattering at primary momenta in the range 1.35–2.02 GeV/c, as well as in quasielastic proton scattering on nuclei in the same momentum range, are summarized. All these data were recently obtained by using the proton synchrotron installed at the Institute of Theoretical and Experimental Physics (ITEP, Moscow). The spectrum and features of seven isospin-3/2 baryon resonances that form a peak in the total cross section at a c.m. energy of 1.9 GeV are analyzed on the basis of new data on the parameters A and R, and the results of this analysis are presented. The experiments surveyed in this article were performed by a collaboration of researchers from ITEP and the Petersburg Nuclear Physics Institute (PNPI, Gatchina), the ITEP-PNPI collaboration. 相似文献
2.
3.
P. Yu. Grigor’ev E. E. Zhurkin 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2012,6(2):229-235
The self-sputtering processes of (111) Si and Al surfaces under bombardment by Si
N
and Al
N
ions and clusters (N = 1−60) with the same energy per particle-projectile atom (1 keV/atom) are studied in this paper. The nonlinear effects produced
in the target during the development stage of an atomic-collision cascade and during the postcascade stage are analyzed, and
a correlation between these effects and secondary emission characteristics is found. The study has been carried out in the
framework of classical molecular dynamics. As a result, a number of features of (111) Si and Al surface sputtering and erosion
have been revealed. Thus, it has been established that the sputtering yield increases nonadditively as the size N of the implanted cluster increases at N > 10, which is related to the appearance of nonlinear cascades and the postcascade heat spike, and is accompanied by microcrater
formation. It is shown that the implantation of clusters into the Si target leads to the formation of amorphous regions. 相似文献
4.
E. E. Zhurkin V. F. Kosmach A. S. Kolesnikov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2007,1(2):176-180
A computer simulation of the bombardment of the Cu (111) surface with CuN and AuN polyatomic clusters differing in size (N = 1, 6, and 13) with energies of 0.5 and 5 keV/atom has been performed in the framework of classical molecular dynamics. The spatial distribution of the implanted atoms, their ranges, and range fluctuations (straggling) depending on the size N and energy E/N of the incident cluster has been investigated. It has been shown that an increase in the mean range and range straggling is observed at a fixed energy per incident atom as the cluster size N increases. At the same time, the effect of an increase in the range (at a specified value of E/N) gradually disappears with increasing cluster energy, whereas the effect of an increase in straggling is retained. These tendencies qualitatively agree with the available experimental observations. It has been shown that the dominating contribution to the increase in the atom range of the implanted cluster is made by the so-called clearing-the-way effect, which is weakened with increasing the incident cluster energy. The effect of the range straggling increasing is significantly due to the presence of nonlinear “spike” effects at the bombarded target. 相似文献
5.
Greg BG Moorhead Laura Trinkle-Mulcahy Mhairi Nimick Veerle De Wever David G Campbell Robert Gourlay Yun Wah Lam Angus I Lamond 《BMC biochemistry》2008,9(1):28
Background
Protein phosphatase one (PP1) is a ubiquitously expressed, highly conserved protein phosphatase that dephosphorylates target protein serine and threonine residues. PP1 is localized to its site of action by interacting with targeting or regulatory proteins, a majority of which contains a primary docking site referred to as the RVXF/W motif. 相似文献6.
Yu. A. Beloglazov A. I. Kovalev S. P. Kruglov D. V. Novinsky V. V. Sumachev V. Yu. Trautman E. A. Filimonov V. A. Shchedrov I. G. Alekseev P. E. Budkovsky V. V. Zhurkin V. P. Kanavets L. I. Koroleva B. V. Morozov V. M. Nesterov V. V. Ryltsov D. N. Svirida A. D. Sulimov N. A. Bazhanov E. I. Bunyatova 《Physics of Atomic Nuclei》2005,68(3):398-403
A program of measurement of the polarization parameter P in elastic π + p interaction in the resonance region of backward pion scattering is presented. This program is aimed at determining the bifurcation points of the trajectory of zeros of the pion-nucleon amplitude and, hence, at unambiguously reconstructing the amplitude of πN scattering in the second resonance region. It is planned to perform a relevant experiment in a pion beam from the accelerator of the Institute of Experimental and Theoretical Physics (ITEP, Moscow). 相似文献
7.
I. G. Alekseev N. A. Bazhanov P. E. Budkovsky E. I. Bunyatova V. P. Kanavets A. I. Kovalev L. I. Koroleva S. P. Kruglov B. V. Morozov V. M. Nesterov D. V. Novinsky V. V. Ryltsov V. A. Shchedrov A. D. Sulimov V. V. Sumachev D. N. Svirida V. Yu Trautman V. V. Zhurkin 《The European Physical Journal C - Particles and Fields》2006,45(2):383-386
The ITEP-PNPI collaboration presents new results of the measurements of the spin rotation parameter A in the elastic scattering of negative pions on protons at Pbeam = 1.43 GeV/c. The results are compared to the predictions of several partial wave analyses. The experiment was performed
at the ITEP proton synchrotron, Moscow. 相似文献
8.
Photoluminescence measurements as a function of excitation intensity and temperature are presented for moderately doped Si : B. Some evidence is obtained for hopping motion of the bound excitons around the impurity centers with trapping at the clusters of impurities. Kinetic parameters of the excitation transfer are estimated. 相似文献
9.
S. D. Bogdanov S. S. Bogdanov E. E. Zhurkin V. F. Kosmach 《Journal of Experimental and Theoretical Physics》1999,88(2):220-226
This work is a continuation of the experimental and theoretical investigations of the effect of the Z
1
3
correction to the stopping power of ions on the passage of heavy ions 40Ar, 56Fe, 197Au, 131Xe, and 238U with energies of about 1 GeV/nucleon through a homogeneous medium. The previously observed systematic deviations of the
calculations based on the first Born approximation to the scattering of a particle by the atomic electrons in the medium from
the experimental values of the total ionization ranges of the nuclei and their stopping powers is confirmed. The discrepancy
increases with the atomic number of the projectile nucleus. It is shown that the Z
1
3
correction in the form proposed by Jackson and McCarthy eliminates, especially for ions with Z
1>50, the systematic discrepancy between the computed and experimental values. For the experimental energy range relativistic
Mott scattering of a particle by the atomic electrons in the target makes the dominant contribution to the observed Z
1
3
effect.
Zh. éksp. Teor. Fiz. 115, 404–415 (February 1999) 相似文献
10.
Dr. Emilio Brunetti Dr. Lionel Marcelis Dr. Fedor E. Zhurkin Prof. Michel Luhmer Prof. Ivan Jabin Prof. Olivia Reinaud Prof. Kristin Bartik 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(55):13730-13738
In this study, the ligand exchange mechanism at a biomimetic ZnII centre, embedded in a pocket mimicking the possible constrains induced by a proteic structure, is explored. The residence time of different guest ligands (dimethylformamide, acetonitrile and ethanol) inside the cavity of a calix[6]arene-based tris(imidazole) tetrahedral zinc complex was probed using 1D EXchange SpectroscopY NMR experiments. A strong dependence of residence time on water content was observed with no exchange occurring under anhydrous conditions, even in the presence of a large excess of guest ligand. These results advocate for an associative exchange mechanism involving the transient exo-coordination of a water molecule, giving rise to 5-coordinate ZnII intermediates, and inversion of the pyramid at the ZnII centre. Theoretical modelling by DFT confirmed that the associative mechanism is at stake. These results are particularly relevant in the context of the understanding of kinetic stability/lability in Zn proteins and highlight the key role that a single water molecule can play in catalysing ligand exchange and controlling the lability of ZnII in proteins. 相似文献