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Search Results: 1 - 10 of 198208 matches for " N. Nesterova "
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Inelastic proton-air cross section at 0.2 TeV-10 PeV
N. Nesterova
Physics , 2015,
Abstract: Experimental data from the Tien Shan complex array on different components of extensive air showers at 0.5-10 PeV primary cosmic rays are compared with results of various calculated models of cosmic rays interactions at the atmosphere. Conclusion is made about the growth with energy of the inelastic proton-air cross section {\sigma}p-air from 0.2 TeV (accelerator experiments with fixed targets) to 10 PeV (cosmic rays). The analysis showed that the rise conforms to (7-9)% per one order of energy. That corresponds to {\sigma}p-air (1 PeV) = 350 mb. These data correspond better to the new QGSJET-II-04 version of the interaction model based on the recent LHC results. This model predicts better the slower rise of the cross section than previous versions of QGSJET-II and some other models.
Search of primary cosmic rays sources at 5x10**13 - 5x10**14 eV with Tien Shan CHRONOTRON - KLARA array
E. N. Gudkova,N. M. Nesterova
Physics , 2015,
Abstract: The primary cosmic ray sources are searched by means of CHRONOTRON - KLARA separate array of the P.N. Lebedev Physical Institute Tien Shan station. It was done on the base of 35 millions observed PCR extensive air showers from 5x10**13 to 5x10**14 eV energies. The data analysis was carried on the method of the direct selection of local areas in equatorial coordinates where the deviation of event numbers exceeded the definite value from normal Gaussian standard. These directions are compared with other arrays observed results and with coordinates of astrophysical sources.
Hexakis(dimethylformamide-κO)manganese(II) (dimethylformamide-κO)pentakis(thiocyanato-κN)chromate(III)
Valentyna V. Semenaka,Oksana V. Nesterova,Vladimir N. Kokozay,Irina V. Omelchenko
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812023069
Abstract: The title compound, [Mn(C3H7NO)6][Cr(NCS)5(C3H7NO)], was obtained unintentionally as a product of an attempted synthesis of heterometallic complexes based on Reineckes anion using manganese powder, Reineckes salt and 1-(2-hydroxyethyl)tetrazole as starting materials. The crystal structure of the complex consists of an [Mn(dmf)6]2+ cation and a [Cr(NCS)5(dmf)]2 anion (dmf = dimethylformamide). The MnII and CrIII atoms show a slightly distorted octahedral MnO6 and CrN5O coordination geometries with adjacent angles in the range 85.29 (13)–95.96 (14)°.
Tris(1,10-phenanthroline-κ2N,N′)iron(II) bis[(1,10-phenanthroline-κ2N,N′)tetrakis(thiocyanato-κN)chromate(III)] acetonitrile trisolvate monohydrate
Valentyna V. Semenaka,Oksana V. Nesterova,Volodymyr N. Kokozay,Volodymyr V. Bon
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812012949
Abstract: Single crystals of the title heterometallic compound, [Fe(C12H8N2)3][Cr(NCS)4(C12H8N2)]2·3CH3CN·H2O or [Fe(Cphen)3][Cr(NCS)4(phen)]2·3CH3CN·H2O, were prepared using the one-pot open-air reaction of iron powder, Reineckes salt and 1,10-phenanthroline (phen) in acetonitrile. The asymetric unit consists of an [Fe(phen)3]2+ cation, two [Cr(phen)(NCS)4] anions, three acetonitrile solvent molecules and a water molecule. The Fe and Cr atoms both show a slightly distorted octahedral FeN6 and CrN6 coordination geometry with adjacent angles in the range 79.67 (12)–95.21 (12)°. No classical hydrogen bonding involving the water molecule is observed.
Diammine(2,2′-bipyridine)bis(thiocyanato-κN)cobalt(III) diamminetetrakis(thiocyanato-κN)chromate(III) acetonitrile disolvate
Valentyna V. Semenaka,Oksana V. Nesterova,Volodymyr N. Kokozay,Roman I. Zybatyuk
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811024998
Abstract: The new heterometallic title complex, [Co(NCS)2(C10H8N2)(NH3)2][Cr(NCS)4(NH3)2]·2CH3CN, has been prepared using the open-air reaction of cobalt powder, Reineckes salt and 2,2′-bipyridine (dpy) in acetonitrile. The crystal structure consists of discrete cationic [Co(NCS)2(NH3)2(dpy)]+ and anionic [Cr(NCS)4(NH3)2] building blocks, both with 2 symmetry, and acetonitrile solvent molecules, which are linked together by N—H...N hydrogen bonds, forming extended supramolecular chains. Furthermore, N—H...S, C—H...S and C—H...N hydrogen bonds interlink neighbouring chains into a three-dimensional framework. The Co atom is in an elongated octahedral coordination environment with two N atoms from the dpy ligands and two NCS-groups in the equatorial plane and with two NH3 molecules at the axial positions. The CrIII ion is octahedraly coordinated by two NH3 molecules at the axial positions and four NCS-groups in the equatorial plane. Intensity statistics indicated non-merohedral twinning with the twin matrix [100; 0overline{1}0; overline{1}0overline{1}]. The refined ratio of the twin components is 0.530 (1):0.470 (1).
Bis{μ2-2-[(2-hydroxyethyl)(methyl)amino]ethanolato}bis(μ3-N-methyl-2,2′-azanediyldiethanolato)tetrakis(thiocyanatato-κN)dichromium(III)dimanganese(II) dimethylformamide tetrasolvate
Valentyna V. Semenaka,Oksana V. Nesterova,Volodymyr N. Kokozay,Roman I. Zubatyuk
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811049336
Abstract: The heterometallic title complex, [Cr2Mn2(C5H11NO2)2(C5H12NO2)2(NCS)4]·4C3H7NO, was prepared using manganese powder, Reineckes salt, ammonium thiocyanate and a non-aqueous solution of N-methyldiethanolamine in air. The centrosymmetric molecular structure of the complex is based on a tetranuclear {Mn2Cr2(μ-O)6} core. The tetranuclear complex molecule and the two uncoordinated dimethylformamide molecules are linked by O—H...O hydrogen bonds, while the two other molecules of dimethylformamide do not participate in hydrogen bonding.
Acholeplasma laidlawii PG8 Culture Adapted to Unfavorable Growth Conditions Shows an Expressed Phytopathogenicity
Vladislav M. Chernov,Natalia E. Moukhametshina,Yurii V. Gogolev,Tatiana N. Nesterova
The Scientific World Journal , 2007, DOI: 10.1100/tsw.2007.25
Abstract:
ADAPTATION TO UNFAVORABLE CONDITIONS OF GROWTH: PATHOGENICITY OF ACHOLEPLASMA LAIDLAWII PG8
Vladislav M. Chernov,Natalia E. Moukhametshina,Yurii V. Gogolev,Tatiana N. Nesterova
Electronic Journal of Biomedicine , 2006,
Abstract: ABSTRACT:As a result of cultivation of A. laidlawii PG8 cells on the deficient medium during 480 days, the mycoplasma culture adapted in vitro to unfavorable growth conditions was obtained. The culture consisted of cells with sizes less than 0.2 μm and features of A. laidlawii PG8 ultramicroforms, nanocells. A. laidlawii PG8 culture adapted in vitro to unfavorable growth conditions shows more evident phytopathogenicity than the unadapted one. Infecting plants V. minor L. by A. laidlawii PG8 culture adapted in vitro to UGC resulted in the appearance of chloroses in 75%, necrosis – 50%, leaves marcescence – 50% and abnormalities of bine development in 30% of plants through 12 days, while infecting plants by A. laidlawii PG8 culture unadapted to UGC led to respective signs in 40%, 25%, 25% and 0% of samples, respectively, through 30 days. The ability of A. laidlawii PG8 to form UMF resistant to stress factors in UGC with high phytopathogenic potential seems to demand a new approach to investigate the precise mechanisms of interacting the mycoplasma with host organisms.RESUMENComo resultado del cultivo de células de A. laidlawii PG8 en medio deficiente durante 480 días, fue obtenido un cultivo de mycoplasma adaptado in vitro a las condiciones desfavorables del crecimiento. El cultivo consistió en células con tama o menor de 0.2 μm y características PG8 ultramicroformas de A. laidlawii nanocélulas. El cultivo de A. laidlawii PG8 adaptado in vitro a condiciones desfavorables del crecimiento muestra más evidente fitopatogenicidad que el inadaptado. Plantas infectadas V. minor L. por el cultivo del A. laidlawii PG8 adaptado in vitro a UGC dio como resultado la aparición de clorosis en el 75%, necrosis en el 50%, marcescencia de las hojas en el 50% y anormalidades del desarrollo del bine en el 30% de plantas a los 12 días, mientras que las plantas infectadas por el cultivo del A. laidlawii PG8 inadaptado a UGC, condujo a dichos signos en el 40%, 25%, 25% y 0% de las muestras, respectivamente en 30 días. La capacidad del A. laidlawii PG8 a formar UMF resistente a los factores de estres en UGC con alto potencial fitopatogénico, parece exigir un nuevo planteamiento para investigar los mecanismos precisos de interacción entre el mycoplasma y el huesped.
Regions of an excessive flux of cosmic rays according to data of the FIAN and MSU arrays
E. N. Gudkova,M. Yu. Zotov,N. N. Kalmykov,G. V. Kulikov,N. M. Nesterova,V. P. Pavlyuchenko
Physics , 2015, DOI: 10.3103/S1062873815030235
Abstract: Results of a blind search for localized regions of an excessive flux of cosmic rays in the energy range from 50 TeV to 20 PeV with the data of the FIAN KLARA-Chronotron experiment, the EAS MSU array and the Prototype of the EAS-1000 array are presented. A number of regions with a significant excess of the registered flux over an expected isotropic background are found. Some of the regions are present in at least two of the data sets considered.
The Eas Bursts - High Energy Extensive Air Showers Correlated in Time
T. T. Barnaveli,T. T. Barnaveli Jr.,N. A. Eristavi,I. V. Khaldeeva,A. P. Chubenko,N. M. Nesterova
Physics , 2009,
Abstract: Bursts of high energy EAS intensity (the series of EAS), following each other in short intervals of time were observed by means of Tien-Shan high mountain installation. For the lower boundary of EAS, uniting in one series, the size Ne= 10**6 (primary energies of the order of 4x10**15 eV) was taken. The condition of amalgamation into one series was the presence of at least two EAS of Ne >10**7. The number of EAS in a series is from 4 to 9 events, with the mean time interval between them 1-5 minutes. Five such series were found in the material treated (approximately 250 days of pure time of the installation run). For each EAS of each series, all the basic parameters are given: observation date and time, age parameter S, galactic coordinates, coordinates of EAS axes relative to the installation center, energy release in the calorimeter and its distance from EAS axes, fitting the Nishimura- Kamata- Greisen (NKG) function. It is essential, that the frequency of the appearing of such series is much higher, than the probability of the occasional fluctuations in the succession of independent EAS. This probably is in favor of the commonality of their origin.
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