Dependence of the ion fractionation coefficient in sea aerosols on the rate of evaporation from the sea surface
Dependence of the ion fractionation coefficient in sea aerosols on the rate of evaporation from the sea surface
M.R. Kuznetsova, E.V. Karavaeva, V.A. Tverdislov
It is shown that the difference between the chemical composition of sea aerosols and that of sea water may be due to irreversible processes of heat and mass exchange between the ocean and the atmosphere. These processes may cause changes in the chemical composition of the ocean surface microlayer, which generates aerosols.
Show AbstractA study of magnetic susceptibility of single-crystal gadolinium under all-round compression
A study of magnetic susceptibility of single-crystal gadolinium under all-round compression
S.A. Nikitin, Yu.I. Spichkin, A.M. Tishin
We measured the dependences of the initial magnetic susceptibility on the temperature $\chi(T)$ of a Gd single crystal along the $c$ and $b$ crystallographic axes in external magnetic fields and up to 1 GPa. The $\chi(T)$ curves were found to have maxima at the Curie temperature $\Theta_C$, the spin-reorientation transition temperature $\Theta_{SR}$, and the temperature $\Theta_A = 140$ К. The derivatives $\partial\Theta_C/\partial P$ and $\partial\Theta_{SR}/\partial P$ are determined, which are -13 and -67 K GPa$^{-1}$ along the $c$ axis and -12 and -29 K GPa$^{-1}$ along the $b$ axis, respectively.
Show AbstractOn an additional component of spontaneous polarization of a $KH_2РO_4$ single crystal
On an additional component of spontaneous polarization of a $KH_2РO_4$ single crystal
A.B. Esengaliev, V.K. Novik, V.N. Novikov, N.D. Gavrilova, N.P. Zaitseva, S.V. Bogatyreva
The pyroelectric coefficient of a KDP (potassium dihydrophosphate) single crystal in nonpolar directions was measured. The data obtained suggest a possible mechanism underlying the appearance of an additional component of spontaneous polarization.
Show AbstractПамяти Сергея Александровича Ахманова
Памяти Сергея Александровича Ахманова
М.А. Воронцов, В.М. Гордиенко, В.П. Кандидов, А.И. Ковригин, Н.И. Коротеев, В.Т. Платоненко, А.С. Чиркин, В.И. Шмальгаузен
1 июля 1992 г. исполнился год с того дня, когда скоропостижно ушел из жизни Сергей Александрович Ахманов — выдающийся физик, крупный организатор науки и высшего образования, лауреат Ленинской и Ломоносовской премий, заслуженный деятель науки РСФСР, заведующий кафедрой общей физики и волновых процессов физического факультета МГУ, научный руководитель Международного лазерного центра МГУ.
Show AbstractПамяти Игоря Борисовича Теплова
Памяти Игоря Борисовича Теплова
В.А. Садовничий, А.И. Акишкин, В.В. Балашов, Н.С. Зеленская, Б.И. Ишханов, Л.С. Корниенко, М.И. Панасюк, Е.А. Романовский, В.И. Саврин, А.Ф. Тулинов, Г.Б. Христиансен
Московский государственный университет, наука нашей страны понесли тяжелую утрату. 15 декабря 1991 г. после тяжелой продолжительной болезни скончался крупный ученый, директор Научно-исследовательского института ядерной физики, заведующий отделением ядерной физики физического факультета, заведующий отделом института, доктор физико-математических наук, профессор Игорь Борисович Теплов.
Show AbstractBrownian motion in weakly nonlinear systems induced by Gaussian fluctuations with arbitrary correlation time
Brownian motion in weakly nonlinear systems induced by Gaussian fluctuations with arbitrary correlation time
T.I. Lakoba
A method is proposed for constructing a closed approximate equation for weakly nonlinear systems exposed to Gaussian noise with the correlation function of an arbitrary form.
Show AbstractThe region of applicability of the modified method of traveling waves in free space
The region of applicability of the modified method of traveling waves in free space
V.D. Gusev, S.M. Golynskii
The region of applicability of the modified method of traveling waves in free space behind a chaotic phase screen is investigated. The model of normal fluctuations of the scattered field phase on the screen is considered in the smallangle scattering approximation. A criterion for the applicability of the modified method is obtained, which substantially extends the potentialities of using the ray interpretation of the wave field in free space as compared to the standard definition of the geometrical optics zone.
Show AbstractCylindrical ferroelectric resonators with plane-parallel end-face electrodes
Cylindrical ferroelectric resonators with plane-parallel end-face electrodes
G.V. Belokopytov, T.V. Krasyuk
The problem of determining the eigenfrequencies of a cylindrical high-permittivity dielectric resonator is reduced to the solution of a transcendental equation of the zeroth approximation and subsequent calculation of corrections.
Show AbstractNonstationary self-consistent model of autoelectronic emission from a metal cathode
Nonstationary self-consistent model of autoelectronic emission from a metal cathode
B.A. Markov, A.D. Poezd
A model of autoelectronic emission for self-consistent nonlinear problems of heavy-current microwave electronics is discussed. On the basis of modeling of a complete nonstationary system of Maxwell-Vlasov equations it is shown that the injection current has a clearly pronounced pulsed character.
Show AbstractRelativistic gyrotrons with beam oscillatory velocity pumping in the interaction space by a nonadiabatic magnetic undulator
Relativistic gyrotrons with beam oscillatory velocity pumping in the interaction space by a nonadiabatic magnetic undulator
A.F. Aleksandrov, V.A. Kubarev, V.A. Cherepenin
A gyrotron construction is proposed in which the region of formation of a helical electron beam and the region of interaction are made eoincident. The pumping can be performed by magnetic undulators with a nonadiabatic (over the length} switching-on of the field. The question of the attainable efficiency of this type of devices is investigated for various injector voltages.
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