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11.
S. V. Gorbunov A. F. Zatsepin V. A. Pustovarov S. O. Cholakh V. Yu. Yakovlev 《Physics of the Solid State》2005,47(4):733-737
A time-resolved cathodo-and photoluminescence study of nanostructural modifications of Al2O3 (powders and ceramics) excited by heavy-current electron beams, as well as by pulsed synchrotron radiation, is reported. It was found that Al2O3 nanopowders probed before and after Fe+ ion irradiation have the same phase composition (the γ-phase/δ-phase ratio is equal to 1), an average grain size equal to ~17 nm, and practically the same set of broad cathodoluminescence (CL) bands peaking at 2.4, 3.2, and 3.8 eV. It was established that Al2O3 nanopowders exhibit fast photoluminescence (PL) (a band at 3.2 eV), whose decay kinetics is described by two exponential stages (τ1 = 0.5 ns, τ2 = 5.5 ns). Three bands, at 5.24, 6.13, and 7.44 eV, were isolated in the excitation spectrum of the fast PL. Two alternate models of PL centers were considered, according to which the 3.2-eV luminescence either originates from radiative relaxation of the P? centers (anion-cation vacancy pairs) or is due to the formation of surface analogs of the F+ center (F S + -type centers). In addition to the fast luminescence, nano-Al2O3 was found to produce slow luminescence in the form of a broad band peaking at 3.5 eV. The excitation spectrum of the 3.5-eV luminescence obtained at T = 13 K exhibits two doublet bands with maxima at 7.8 and 8.3 eV. An analysis of the luminescent properties of nanostructural and single-crystal Al2O3 suggests that the slow luminescence of nanopowders at 3.5 eV is due to radiative annihilation of excitons localized near structural defects. 相似文献
12.
P. G. Sveshnikov T. A. Yagudin E. V. Morozkina E. V. Klyachko S. S. Zatsepin S. V. Benevolensky O. B. Shemchukova L. P. Pozdnyakova O. N. Solopova 《Moscow University Chemistry Bulletin》2010,65(3):154-158
This paper describes the production of a functional humanized Fab fragment of a neutralizing antibody against the rabies virus.
It is a prototype of a therapeutic agent that could be an alternative to equine anti-rabies immunoglobulins and anti-rabies
serum immunoglobulins obtained from the blood of vaccinated human donors. Variable fragments of the high-affinity light and
heavy chains neutralizing an antibody against the rabies virus were cloned and sequenced. Mouse constant regions were replaced
by human constant regions followed by expression of the humanized Fab fragments in a yeast expression system. The immunochemical
properties of the Fab fragments were evaluated using ELISA, polyacrylamide gel electrophoresis, and the Western blot assay.
The binding capability of the produced humanized Fab fragments surpasses that of the parental antibody. A high degree of humanization
was confirmed using sera against human immunoglobulins. The yield of the humanized Fab fragments was 21 mg per liter of culture
medium. The purified Fab fragment preparation did not contain traces of the isolated light and heavy chains of the humanized
Fab fragments. 相似文献
13.
A.F. Zatsepin 《Journal of Non》2011,357(8-9):1856-1859
The thermal decay regularities for radiation-induced E'-centers in crystalline and glassy SiO2 were investigated. The results obtained point out that the destruction of E'-centers can be described as ionization process of deep centers in electric field. In terms of used model, the electric field and electron–vibration coupling parameters are sensitive to structural disorder. The most weak electron–phonon coupling in E'-centers is observed for amorphous systems. 相似文献
14.
We have studied local configurations and vibration states of oxygen vacancies in different charge states in α-quartz. The local atomic structure and the lattice dynamics have been simulated using first-principles potentials of the Buckingham type. The effect of defects on the vibration spectrum of α-quartz has been studied by calculating the local densities of vibrational states. 相似文献
15.
A. D. Panov J. H. Adams Jr. H. S. Ahn G. L. Bashindzhagyan J. W. Watts J. P. Wefel J. Wu T. G. Guzik V. I. Zatsepin J. Isbert K. C. Kim M. Christl E. N. Kouznetsov M. I. Panasyuk E. B. Postnikov E. S. Seo N. V. Sokolskaya J. Chang 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(3):319-322
A strong anomaly in form of a wide peak in the energy range 300–800 GeV was discovered in the first measurements of the electron spectrum in the energy range from 20 GeV to 3 TeV by the balloon-borne experiment ATIC [1]. The experimental data processing and analysis of the electron spectrum with different criteria for selection of electrons completely independent of the results reported in [1] is employed in the present paper. New independent analysis generally confirms the results of [1] but shows that the spectrum in the region of the anomaly is represented by a number of narrow peaks. Measured spectrum is compared to the spectrum of [1] and to the spectrum of the Fermi/LAT experiment. 相似文献
16.
M. Aglietta G. Badino G. F. Bologna C. Castagnoli W. Fulgione P. Galeotti O. Saavedra G. Trinchero S. Vernetto V. L. Dadykin V. B. Kortchaguin P. V. Kortchaguin A. S. Malguin V. G. Ryassny O. G. Ryazhskaya V. P. Talochkin G. T. Zatsepin V. F. Yakushev 《Il Nuovo Cimento C》1986,9(2):185-195
Summary The Liquid Scintillation Detector (LSD experiment) is running since October 1984 in the Mont Blanc Laboratory, with 90 tons
of active mass. We discuss here some of the research aims of the experiment, and report the preliminary results on searching
for neutrino bursts from collapsing stars and on cosmic-ray muons.
Riassunto Nell'ottobre 1984 è entrato in misura l'esperimento LSD (Liquid Scintillation Detector) del Laboratorio del Monte Bianco, costituito di 90 tonnellate di rivelatore. In questo lavoro si discutono alcuni degli argomenti di ricerca dell'esperimento e si riportano i risultati preliminari sui burst di neutrini da collassi stellari e sui muoni della radiazione cosmica.
Резюме Зидкий сцинтилляционный детектор работает с октября 1984 года в лаборатории на Мон Блане. Детектор имеет 90 тонн активной массы. Мы обсуздаем некоторые цели этого эксперимента. Сообщаются предварительные результаты по поиску нейтринных вспышек от коллапсирующих звезд и мюонов в космических лучах.相似文献
17.
V. B. Guseva A. F. Zatsepin V. A. Vazhenin B. Schmidt N. V. Gavrilov S. O. Cholakh 《Physics of the Solid State》2005,47(4):674-677
Silica glasses exposed to steady-state and pulsed irradiation with Fe+ ions are studied using magnetic resonance. The irradiation doses used in experiments are equal to 1 × 1015, 1 × 1016, and 1 × 1017 cm?2. It is found that, under both steady-state and pulsed irradiation conditions, glass samples exposed at a dose of 1 × 1017 cm?2 exhibit a broadband orientation-dependent signal. The shape of inclusions is evaluated under the assumption that the observed spectrum is caused by the ferromagnetic resonance induced in a new phase of metallic iron. 相似文献
18.
G. Badino G. Bologna C. Castagnoli W. Fulgione P. Galeotti O. Saavedra V. L. Dadykin V. B. Korchaguin P. V. Korchaguin A. S. Malguin O. G. Ryazhskaya A. L. Tziabuk V. P. Talochkin G. T. Zatsepin V. F. Yakushev 《Il Nuovo Cimento C》1984,7(6):573-590
Summary We discuss here the results from calibrating liquid seintillation counters (1.5 m3 each) used in the large-volume neutrino experiment in the Mont Blanc Laboratory. The electronic and recording systems from
the 72 counters of the detector are described, and the method to detect low-energy γ pulse from (n, p) reaction by using252Cf as a neutron source is discussed.
Paper presented at the 2° Convegno Nazionale di Fisica Cosmica, held at L'Aquila, 29 May–2 June 1984. 相似文献
19.
G.B. Cherlov S.P. Freidman A.F. Zatsepin V.S. Kortov V.A. Gubanov 《Solid State Communications》1985,55(5):495-497
Electron structure calculations of the bulk defects, connected with oxygen vacancies in SiO2 have been performed by the non-empirical discrete variational method. Two models of E′1-center are analyzed, the first considering the unpaired electron in the planar SiO3 fragment and the second in the pyramidal one (“asymmetrically relaxed vacancy”). The comparison of calculation results with ESR and optical data gives evidence in favour of the asymmetrical relaxation model. 相似文献
20.
The results of soft-x-ray O Kα emission (XES) and O 1s absorption spectroscopy (XAS) measurements of Pb-implanted glassy and crystalline silica are presented. The x-ray O Kα (2p → 1s electron transition) emission spectra of SiO2 were recorded before and after Pb-implantation with the energy of 30 keV and ion fluence 5 × 1016 ion/cm2. It was found that XES O Kα of implanted samples is sensitive to the disordering degree of the oxygen sublattice. The transformations and peculiarities of the spectra shape of implanted samples are explained by the disordering and amorphization effects in the structure of Pb-implanted SiO2. Comparing the XES O Kα of reference a-SiO2, Pb-implanted SiO2 and binary glassy PbO-SiO2 system, it was established that the ion-beam treatment of oxide matrix does not generate an oxidized Pb as PbO4-type structural units. The energy band gap of 9.2 eV well coincides with previously reported data and was evaluated qualitatively with the help of overlaying the XES O Kα and XAS O 1s to the common energy scale for Pb-implanted SiO2 and binary glassy PbO-SiO2. 相似文献