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166 results on '"Batishchev, O."'

5. Optimization of on-axis magnetic field of uniformly magnetized cones.

Author

Batishchev, O. and Hyde, A.

Subjects
*MAGNETIC fields, *CONES, *ALGEBRAIC equations, *ANGLES, *SYMMETRY
Abstract

The magnetic field B induced along the axis of symmetry of axially magnetized cones was studied analytically and experimentally for various cone angles α. An explicit algebraic equation was derived for sharp-pointed and truncated cones. A sharp cone is characterized by singularities of B and ∇ B at its apex point. For a truncated cone, the maximum values of these quantities are achieved for α m a x ∼ 54.7 ° and α ∇ ∼ 39.2 ° , respectively. Two truncated cones with α u n i ∼ 63.4 ° positioned in a mirrored co-apex configuration produce a uniform axial field in the free-space gap. For smaller angles, the minimum field is located in the center of the airgap, while for larger, it is at the cones' surfaces with extremum at α m i n ∼ 71.6 °. These predictions were investigated using a tunable apparatus in which Co–Fe cones are magnetized by cylindrical NdFeB magnets. Strong ∼ 4 T B-field was achieved. Experimental results are discussed in detail, including incomplete magnetization and other secondary effects. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Hysteresis in strongly magnetized N2 discharges.

Author

Hyde, A. and Batishchev, O.

Subjects
*NONLINEAR differential equations, *PLASMA chemistry, *ORDINARY differential equations, *ELECTRON temperature, *ELECTRIC propulsion
Abstract

A semi-empirical global model for a nitrogen discharge in a strong magnetic field is developed. The model is based upon experimental data from high-resolution Doppler and extreme-ultraviolet vacuum spectroscopy, which establish the plasma composition, discharge parameters, and, most importantly, electronic transitions. This allows the number of required molecular systems and atomic/ionic states to be reduced, thereby retaining only the essential plasma chemistry reactions. The set of 35 stiff non-linear ordinary differential equations is numerically integrated using an unconditionally stable adaptive method. Simulations show the existence of two solution branches with low and high electron temperature, respectively. A distinct hysteresis is exhibited by the discharge and illustrated for three typical N2 mass flow rates. The dependencies of the plasma parameters on the applied power are presented and discussed in detail, including in the vicinity of the bifurcation points. The efficiency of operation in the opposing limits of N2 discharge behavior as either a source of plasma or light emission is examined, with special emphasis on electric propulsion capabilities. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Correction for Shtykova et al., “Solution Structure, Self-Assembly, and Membrane Interactions of the Matrix Protein from Newcastle Disease Virus at Neutral and Acidic pH”

Author

Shtykova, E. V., primary, Petoukhov, M. V., additional, Dadinova, L. A., additional, Fedorova, N. V., additional, Tashkin, V. Yu, additional, Timofeeva, T. A., additional, Ksenofontov, A. L., additional, Loshkarev, N. A., additional, Baratova, L. A., additional, Jeffries, C. M., additional, Svergun, D. I., additional, and Batishchev, O. V., additional

Published
2021
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28. Solution Structure, Self-Assembly, and Membrane Interactions of the Matrix Protein from Newcastle Disease Virus at Neutral and Acidic pH

Author

Shtykova, E. V., primary, Petoukhov, M. V., additional, Dadinova, L. A., additional, Fedorova, N. V., additional, Tashkin, V. Yu, additional, Timofeeva, T. A., additional, Ksenofontov, A. L., additional, Loshkarev, N. A., additional, Baratova, L. A., additional, Jeffries, C. M., additional, Svergun, D. I., additional, and Batishchev, O. V., additional

Published
2019
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38. Space plasma disturbances caused by NAU-launched whistler waves

Author

Pradipta, R, primary, Cohen, J A, additional, Lee, M C, additional, Labno, A, additional, Burton, L M, additional, Riddolls, R J, additional, Batishchev, O V, additional, Coster, A J, additional, Burke, W J, additional, Starks, M J, additional, Sulzer, M P, additional, and Kuo, S P, additional

Published
2008
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43. Anomalous transmission of high contrast relativistically intense short pulses through thin metal foils

Author

Matsuoka, T., Maksimchuk, A., Lin, T., Batishchev, O. V., Batishcheva, A. A., Bychenkov, V. Yu., Matsuoka, T., Maksimchuk, A., Lin, T., Batishchev, O. V., Batishcheva, A. A., and Bychenkov, V. Yu.

Abstract

The frequency doubled laser pulses from the T3 laser system at the Center for Ultrafast Optical Science of the University Michigan1(with energy up to 1 J, a pulse duration of 400 fs, the wavelength is 0.53 ${\rm \mu} $m and the maximum intensity is $2.7\times 10^{19}$W/cm$^{2})$has been used to measure the light transmitted through thin metal targets. The intensity contrast ratio of the laser pulse was better than 10- 9which is low enough to suggest the interaction with solid density plasma without preplasma. We observed the transmittance of the laser pulse through the aluminum foil with thickness up to 4 ${\rm \mu} $m and found that this radiation is polarized and centered at 0.53 ${\rm \mu} $m. We found that for 0.8 ${\rm \mu} $m thick foils the transmission was anomalously high (${\sim}10^{ - 2}$%) and can't be explained by the skin effect for relativistic pulse.

Published
2006
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