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81.
Vilkov AN Gamage CM Misharin AS Doroshenko VM Tolmachev DA Tarasova IA Kharybin ON Novoselov KP Gorshkov MV 《Journal of the American Society for Mass Spectrometry》2007,18(8):1552-1558
A new Fourier transform ion cyclotron resonance mass spectrometer based on a permanent magnet with an atmospheric pressure ionization source was designed and constructed. A mass resolving power (full-width-at-half-maximum) of up to 80,000 in the electron ionization mode and 25,000 in the electrospray mode was obtained. Also, a mass measurement accuracy at low-ppm level has been demonstrated for peptide mixtures in a mass range of up to 1200 m/z in the isotopically resolved mass spectra. 相似文献
82.
M. Zhuravleva A. Novoselov E. Mihokova J. A. Mares A. Vedda M. Nikl A. Yoshikawa 《Crystal Research and Technology》2007,42(12):1324-1328
This paper deals with Pr‐doped and Pr, Si‐codoped YAlO3 single crystal growth by the micro‐pulling‐down method and investigation of their spectroscopic and scintillating properties. The Pr3+ 5d ‐4f radioluminescence intensity is more than 10 times higher than that of Bi4Ge3O12 standard sample, but the Si‐codoping decreases it. Absorption spectra of as‐grown and air‐annealed Si,Pr‐codoped YAlO3 samples show along with an onset of 4f ‐5d transition round 230 nm the induced absorption band at 400 nm which possibly related to a hole center absorption (Pr4+ or O‐). Thermoluminescence measurements above the room temperature were performed in order to monitor deep electron traps. Strong concentration dependence of thermoluminescence was observed for Pr:YAlO3 glow curves. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
83.
Meshkov E. A. Novoselov I. I. Yanilkin A. V. Rogozhkin S. V. Nikitin A. A. Khomich A. A. Shutov A. S. Tarasov B. A. Danilov S. E. Arbuzov V. L. 《Physics of the Solid State》2020,62(3):389-400
Physics of the Solid State - A comprehensive experimental–theoretical study of the processes of local ordering of multicomponent alloys has been carried out. Atom probe tomography and... 相似文献
84.
Ivanov D. A. Valueva S. V. Borovikova L. N. Novoselov N. P. 《Russian Journal of Applied Chemistry》2010,83(2):297-301
Macroinitiators containing β-diketonate fragments were prepared by copolymerization of styrene with cobalt(II) 5-Formation
and morphological characteristics of selenium-containing nanostructures formed by reduction of selenious acid with ascorbic
acid in the presence of ionic or nonionic polymeric stabilizer in aqueous solutions were studied by methods of nonlinear optics
and flow birefringence at widely varied selenium to polymer weight ratio in solution ν. The molecular weights, root-mean-square
and hydrodynamic sizes, and mean density of the nanostructures were calculated, and the trends in variation of these quantities
were compared. 相似文献
85.
G. V. Zimina A. V. Novoselov I. N. Smirnova F. M. Spiridonov G. Ya. Pushkina L. N. Komissarova 《Russian Journal of Inorganic Chemistry》2010,55(12):1833-1836
Ytterbium- and neodymium-substituted yttrium aluminum garnets were obtained by hydroxide coprecipitation and by the cryochemical method. A continuous series of solid solutions in the Y3Al5O12 — Yb3Al5O12 system and limited solid solutions (Nd x Y1 ? x )3Al5O12 (0 ≤ x ≤ 0.19) were obtained. The synthetic methods used made it possible to reduce the synthesis temperature from 1800 to 950°C and to obtain more homogeneous and nanosized material. 相似文献
86.
D. A. Ivanov S. V. Valueva N. P. Novoselov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2010,84(6):1005-1008
Selenium-containing nanostructures of rigid-chain polymers with close molecular masses were studied by flow birefringence
(FB) and static and dynamic light scattering at a fixed selenium to polymer mass ratio ν = 0.1 in solution. The group of polymers
under study included the cationic polyelectrolyte poly-N,N,N,N-trimethylmethacryloyloxyethylammonium methyl sulfate, anionic
polyelectrolyte carboxymethylcellulose, and nonionogen polymer oxyethylcellulose. High-molecular selenium-containing polymer
nanostructures were found in all cases. Nanostructures with a maximum molecular mass and the largest number of constituent
macromolecules were obtained using oxyethylcellulose. At ν = 0.1 the mean square radii of inertia of the nanostructures were
almost independent of the nature of the polymer matrix. The thermodynamic state of the solutions of nanostructures was close
to the ideal one in all cases. For the region where stable dispersions formed, the Gibbs energies of macromolecule-selenium
nanoparticle interactions were calculated and shown to be almost independent of the nature of the polymer matrix at ν = 0.1.
The close mean square radii of inertia R
g* of the nanostructures, the Gibbs energies of interaction, and the equivalence of the thermodynamic state of the solutions
of nanostructures obtained for all polymer matrices at ν = 0.1 suggest that ν = 0.1 corresponds to the ultimate adsorption
capacity of selenium nanoparticles; the considerable differences between the molecular masses (for close R
g
* values), mean densities, and structural conformation parameters ρ* point to different packings of macromolecules in the nanostructures
under study. 相似文献
87.
Castro EV Ochoa H Katsnelson MI Gorbachev RV Elias DC Novoselov KS Geim AK Guinea F 《Physical review letters》2010,105(26):266601
The temperature dependence of the mobility in suspended graphene samples is investigated. In clean samples, flexural phonons become the leading scattering mechanism at temperature T?10 K, and the resistivity increases quadratically with T. Flexural phonons limit the intrinsic mobility down to a few m(2)/V s at room T. Their effect can be eliminated by applying strain or placing graphene on a substrate. 相似文献
88.
89.
90.
L. V. Myznikov U. N. Dmitrieva T. V. Artamonova S. V. Vorona N. P. Novoselov Yu. E. Zevatskiy 《Russian Journal of Organic Chemistry》2013,49(5):754-757
Oxidation of 1-substituted 5-arylsulfanyltetrazoles with m-chloroperoxybenzoic acid and NaIO4 in the presence of RuCl3 leads to the formation of the 5-arylsulfonyltetrazoles. The microwave activation significantly accelerates the oxidation with sodium periodate. The phenylsulfonyl group in compounds obtained underwent the nucleophilic substitution when treated with ethanol, phenol, or benzimidazole in acetonitrile in the presence of NaOH. 相似文献