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31.
JETP Letters - A mechanism for the initiation of explosive electron emission at the interface between the cathode and a dense gas is proposed. It is based on the accumulation of positive ions,... 相似文献
32.
Gashkov M. A. Zubarev N. M. Zubareva O. V. Mesyats G. A. Sharypov K. A. Shpak V. G. Shunailov S. A. Yalandin M. I. 《JETP Letters》2021,113(6):370-377
JETP Letters - The first results of study of the compression of a picosecond runaway electron flow in an air electrode gap by a pulsed guiding magnetic field increasing along the electron... 相似文献
33.
Mikhail V. Gorshkov David M. Good Yaroslav Lyutvinskiy Hongqian Yang Roman A. Zubarev 《Journal of the American Society for Mass Spectrometry》2010,21(11):1846-1851
Ion storage in an electrostatic trap has been implemented with the introduction of the Orbitrap Fourier transform mass spectrometer
(FTMS), which demonstrates performance similar to high-field ion cyclotron resonance MS. High mass spectral characteristics
resulted in rapid acceptance of the Orbitrap FTMS for Life Sciences applications. The basics of Orbitrap operation are well
documented; however, like in any ion trap MS technology, its performance is limited by interactions between the ion clouds.
These interactions result in ion cloud couplings, systematic errors in measured masses, interference between ion clouds of
different size yet with close m/z ratios, etc. In this work, we have characterized the space-charge effect on the measured frequency for the Orbitrap FTMS,
looking for the possibility to achieve sub-ppm levels of mass measurement accuracy (MMA) for peptides in a wide range of total
ion population. As a result of this characterization, we proposed an m/z calibration law for the Orbitrap FTMS that accounts for the total ion population present in the trap during a data acquisition
event. Using this law, we were able to achieve a zero-space charge MMA limit of 80 ppb for the commercial Orbitrap FTMS system
and sub-ppm level of MMA over a wide range of total ion populations with the automatic gain control values varying from 10
to 107. 相似文献
34.
Possible equilibrium configurations of the free surface of a conducting liquid deformed by a nonuniform external electric field are investigated. The liquid rests on an electrode that has the shape of a dihedral angle formed by two intersecting equipotential half-planes (conducting wedge). It is assumed that the problem has plane symmetry: the surface is invariant under shift along the edge of the dihedral angle. A one-parametric family of exact solutions for the shape of the surface is found in which the opening angle of the region above the wedge serves as a parameter. The solutions are valid when the pressure difference between the inside and outside of the liquid is zero. For an arbitrary pressure difference, approximate solutions to the problem are constructed and it is demonstrated the approximation error is small. It is found that, when the potential difference exceeds a certain threshold value, equilibrium solutions are absent. In this case, the region occupied by the liquid disintegrates, the disintegration scenario depending on the opening angle. 相似文献
35.
Y. P. Pershyn E. N. Zubarev V. V. Kondratenko V. A. Sevryukova S. V. Kurbatova 《Applied Physics A: Materials Science & Processing》2011,103(4):1021-1031
Processes undergoing in Sc/Si multilayer X-ray mirrors (MXMs) with periods of ∼27 nm and barrier layers of CrB20.3- and 0.7-nm thick within the temperature range of 420–780 K were studied by methods of small-angle X-ray reflectivity
(λ=0.154 nm) and cross-sectional transmission electron microscopy. All layers with the exception of Sc ones are amorphous. Barrier
layers are stable at least up to a temperature of 625 K and double the activation energy of diffusional intermixing at moderate
temperatures. Introduction of barriers improves the thermal stability of Sc/Si MXMs at least by 80 degrees. Diffusion of Si
atoms through barrier layers into Sc layers with formation of silicides was shown to be the main degradation mechanism of
MXMs. A comparison of the stability for Sc/Si MXMs with different barriers published in the literature is conducted. The ways
of further improvement of barrier properties are discussed. 相似文献
36.
A. A. Goloborod’ko C. Mayerhofer A. R. Zubarev I. A. Tarasova A. V. Gorshkov R. A. Zubarev M. V. Gorshkov 《Journal of Analytical Chemistry》2010,65(14):1462-1468
Database search is the most popular approach used for the identification of peptides in contemporary shotgun proteomics; it
utilizes only mass spectrometric data. In this work, we introduce three criteria for the verification of peptide identification;
these are based on the analysis of data orthogonal to tandem mass spectra. The first one utilizes chromatographic retention
times of peptides. The development of such approaches has been hindered by the relatively low accuracy of retention time prediction
algorithms. In this work, we suggest the use of two independent models of the liquid chromatography of peptides, which increase
the reliability of the results. The second criterion utilizes the mean number of missed tryptic cleavages per peptide. The
third one results from the analysis of the difference between theoretical and experimentally measured peptide masses. The
proposed criteria were applied to the tandem mass spectra of tryptic peptides from rat kidney tissue, which were processed
by the Mascot search engine. All the criteria showed that Mascot significantly overestimated the reliability of an identification.
This conclusion was supported by the PeptideProphet algorithm. 相似文献
37.
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40.
V. N. Zubarev 《Journal of Applied Mechanics and Technical Physics》1971,12(2):263-267
We investigated the dynamic compressibility of a piezoceramic composed of lead zirconatetitanate (LCT) and its depolarization by shock waves over the pressure range 100–500 kbar. We also observed the changes that persisted in the specimens after brief compression at pressures of 350 and 500 kbar. The dependence of the piezocurrent on time was used to calculate the dielectric permeability and conductivity of the ceramic beyond the shock-wave front over the pressure range investigated. This article discusses the possibility of a phase transition to the paraelectric phase in LCT during compression by a shock wave.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, Vol. 13, No. 2, pp. 106–110, March–April, 1971.The author wishes to thank R. M. Zaidel' for his helpful comments and A. N. Shuikin for his assistance in processing the experimental data. 相似文献