546 research outputs found
Calculations of exchange interaction in impurity band of two-dimensional semiconductors with out of plane impurities
We calculate the singlet-triplet splitting for a couple of two-dimensional
electrons in the potential of two positively charged impurities which are
located out of plane. We consider different relations between vertical
distances of impurities and and their lateral distance . Such a
system has never been studied in atomic physics but the methods, worked out for
regular two-atomic molecules and helium atom, have been found to be useful.
Analytical expressions for several different limiting configurations of
impurities are obtained an interpolated formula for intermediate range of
parameters is proposed. The -dependence of the splitting is shown to become
weaker with increasing .Comment: 14 pages, RevTeX, 5 figures. Submitted to Phys Rev.
The Increase in Thickness Uniformity of Films Obtained by Magnetron Sputtering with Rotating Substrate
The titanium thin films obtained by magnetron sputtering with the rotating substrate at different distances between the substrate and magnetron centers were studied with regard to the uniformity of the film thickness distribution. On the basis of the experimental data obtained, the model for the magnetron film deposition during substrate rotation was developed. The analysis of the simulation results shows that the model error is not greater than 10%
ΠΠ΄Π½ΠΎΡΠ΅Π°ΠΊΡΠΎΡΠ½ΠΈΠΉ ΡΠΈΠ½ΡΠ΅Π· Π·Π°ΠΌΡΡΠ΅Π½ΠΈΡ ΡΠΌΡΠ΄Π°Π·ΠΎΠ»ΡΠ΄ΠΈΠ½-2-ΠΎΠ½ΡΠ² Π·Π° ΡΡΠ°ΡΡΡ ΡΡΠΎΠ±Π°ΡΠ±ΡΡΡΡΠΎΠ²ΠΎΡ ΠΊΠΈΡΠ»ΠΎΡΠΈ, Π°ΡΠΈΠ»Π³Π»ΡΠΎΠΊΡΠ°Π»ΡΠ² ΡΠ° ΡΠ΅ΡΠΎΠ²ΠΈΠ½
Derivatives of imidozoline-2-ones containing the pyrimidinthionic moiety in position 4 have been synthesized by three-component one-pot condensation of thiobarbituric acid, arylglyoxal hydrates and ureas. It has been found that these compounds exist in the solution of DMSO-d6 as a mixture of two tautomeric forms: for products obtained from N-substituted ureas the imidazolidin form predominates; and in the case of urea the imidazolidin and imidazolin forms are present in the ratio of 1:1.Π’ΡΠ΅Ρ
ΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠ½ΠΎΠΉ ΠΊΠΎΠ½Π΄Π΅Π½ΡΠ°ΡΠΈΠ΅ΠΉ ΡΠΈΠΎΠ±Π°ΡΠ±ΠΈΡΡΡΠΎΠ²ΠΎΠΉ ΠΊΠΈΡΠ»ΠΎΡΡ, Π³ΠΈΠ΄ΡΠ°ΡΠΎΠ² Π°ΡΠΈΠ»Π³Π»ΠΈΠΎΠΊΡΠ°Π»Π΅ΠΉ ΠΈ ΠΌΠΎΡΠ΅Π²ΠΈΠ½ ΡΠΈΠ½ΡΠ΅Π·ΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄Π½ΡΠ΅ ΠΈΠΌΠΈΠ΄Π°Π·ΠΎΠ»ΠΈΠ΄ΠΈΠ½-2-ΠΎΠ½ΠΎΠ², ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠ΅ ΠΎΡΡΠ°ΡΠΎΠΊ ΠΏΠΈΡΠΈΠΌΠΈΠ΄ΠΈΠ½ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΡΠ°Π³ΠΌΠ΅Π½ΡΠ° Π² ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠΈ 4. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΡΡΠΈ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΡ ΡΡΡΠ΅ΡΡΠ²ΡΡΡ Π² ΡΠ°ΡΡΠ²ΠΎΡΠ΅ ΠΠΠ‘Π-d6 Π² Π²ΠΈΠ΄Π΅ ΡΠΌΠ΅ΡΠΈ Π΄Π²ΡΡ
ΡΠ°ΡΡΠΎΠΌΠ΅ΡΠ½ΡΡ
ΡΠΎΡΠΌ: Π΄Π»Ρ ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ², ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ N-Π·Π°ΠΌΠ΅ΡΠ΅Π½Π½ΡΡ
ΠΌΠΎΡΠ΅Π²ΠΈΠ½, ΠΏΡΠ΅ΠΎΠ±Π»Π°Π΄Π°Π΅Ρ ΠΈΠΌΠΈΠ΄Π°Π·ΠΎΠ»ΠΈΠ΄ΠΈΠ½ΠΎΠ²Π°Ρ ΡΠΎΡΠΌΠ°, ΡΠΎΠ³Π΄Π° ΠΊΠ°ΠΊ Π² ΡΠ»ΡΡΠ°Π΅ ΠΌΠΎΡΠ΅Π²ΠΈΠ½Ρ ΠΈΠΌΠΈΠ΄Π°Π·ΠΎΠ»ΠΈΠ΄ΠΈΠ½ΠΎΠ²Π°Ρ ΠΈ ΠΈΠΌΠΈΠ΄Π°Π·ΠΎΠ»ΠΈΠ½ΠΎΠ²Π°Ρ ΡΠΎΡΠΌΡ ΠΏΡΠΈΡΡΡΡΡΠ²ΡΡΡ Π² ΡΠΎΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΈ 1:1.Π’ΡΠΈΠΊΠΎΠΌΠΏΠΎΠ½Π΅Π½ΡΠ½ΠΎΡ ΠΊΠΎΠ½Π΄Π΅Π½ΡΠ°ΡΡΡΡ Π³ΡΠ΄ΡΠ°ΡΡΠ² Π°ΡΠΈΠ»Π³Π»ΡΠΎΠΊΡΠ°Π»ΡΠ², ΡΡΠΎΠ±Π°ΡΠ±ΡΡΡΡΠΎΠ²ΠΎΡ ΠΊΠΈΡΠ»ΠΎΡΠΈ Ρ ΡΠ΅ΡΠΎΠ²ΠΈΠ½ ΡΠΈΠ½ΡΠ΅Π·ΠΎΠ²Π°Π½ΠΎ ΠΏΠΎΡ
ΡΠ΄Π½Ρ ΡΠΌΡΠ΄Π°Π·ΠΎΠ»ΡΠ΄ΠΈΠ½-2-ΠΎΠ½Ρ ΡΠ· Π·Π°Π»ΠΈΡΠΊΠΎΠΌ ΠΏΡΡΠΈΠΌΡΠ΄ΠΈΠ½ΡΡΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΡΠ°Π³ΠΌΠ΅Π½ΡΡ Π² ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½Ρ 4. ΠΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΠΎ ΠΎΡΡΠΈΠΌΠ°Π½Ρ ΡΠΏΠΎΠ»ΡΠΊΠΈ ΡΡΠ½ΡΡΡΡ Ρ ΡΠΎΠ·ΡΠΈΠ½Ρ ΠΠΠ‘Π-d6 ΡΠΊ ΡΡΠΌΡΡ Π΄Π²ΠΎΡ
ΡΠ°ΡΡΠΎΠΌΠ΅ΡΠ½ΠΈΡ
ΡΠΎΡΠΌ: Π΄Π»Ρ ΠΏΡΠΎΠ΄ΡΠΊΡΡΠ², ΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ
Π½Π° ΠΎΡΠ½ΠΎΠ²Ρ N-Π·Π°ΠΌΡΡΠ΅Π½ΠΈΡ
ΡΠ΅ΡΠΎΠ²ΠΈΠ½, ΠΏΠ΅ΡΠ΅Π²Π°ΠΆΠ°Ρ ΡΠΌΡΠ΄Π°Π·ΠΎΠ»ΡΠ΄ΠΈΠ½ΠΎΠ²Π° ΡΠΎΡΠΌΠ°, ΡΠΎΠ΄Ρ ΡΠΊ Ρ Π²ΠΈΠΏΠ°Π΄ΠΊΡ ΡΠ΅ΡΠΎΠ²ΠΈΠ½ΠΈ ΡΠΌΡΠ΄Π°Π·ΠΎΠ»ΡΠ΄ΠΈΠ½ΠΎΠ²Π° ΡΠ° ΡΠΌΡΠ΄Π°Π·ΠΎΠ»ΡΠ½ΠΎΠ²Π° ΡΠΎΡΠΌΠΈ ΠΏΡΠΈΡΡΡΠ½Ρ Ρ ΡΠΏΡΠ²Π²ΡΠ΄Π½ΠΎΡΠ΅Π½Π½Ρ 1:1
Π Π΅Π°ΠΊΡΠΎΡΡ Ρ ΠΌΠΈΠΊΡΠΎΡΠ²ΡΠ»Π°ΠΌΠΈ: Π³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΠΊΠ° ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΡΡ ΠΊΠ°Π½Π°Π»ΠΎΠ² Π½Π°ΡΡΠΏΠ½ΠΎΠΉ ΡΠ±ΠΎΡΠΊΠΈ
The prospect of use of fuel in the form of micro particles (balls with a diameter about a millimeter formed by the fissile material and a protective cover to hold the radioactive fission products) in nuclear reactors is disclosed. Itβs marked that flow ability, large specific surface of heat removal, extraordinary high resistance of micro fuel particles allow to design innovative safe reactors for various purpose: transportable, breeders, high-temperature, high neutron flux etc. Itβs suggested to complete the active zone by bulk heat releasing assemblies. In them the advantages of spherical micro fuel particles and a coolant side supply to the bed through permeable distribution and branch channels are harmoniously combined in these assembles. It is presented the scheme of bulk assemblies and carried out the analysis of modeling of dynamics of a stream in permeable channels. It is shown that the mathematical description of liquid movement in such channels has ambiguity and discrepancy. To eliminate modeling shortcomings a new kinematic image of current in the permeable channels was offered. It was proposed instead of the existing one representing a jet to which particles of coolant were continuously joined or separated on the permeable wall. In the new interpretation the flow in the permeable channel is considered as turn of the stream at its simultaneous expansion or narrowing depending on there is outflow or inflow. On the base of this image the equation for determination of coolant pressure changing in the permeable channel is obtained; reaction of a stream for changing of flow rate increment is established, the tangent component of a velocity on a permeable wall is founded. Thereby the disadvantages of describing of coolant moving in the bulk assembles channels are eliminated. Permeable channels are used not only in nuclear reactors, but also in many other technological devices: catalytic reactors, heat exchangers, filters, collector and distributing systems. The obtained results can be used for designing other devices with permeable channels.Π Π°ΡΠΊΡΡΡΠ° ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π° ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΠ΄Π΅ΡΠ½ΡΡ
ΡΠ΅Π°ΠΊΡΠΎΡΠ°Ρ
ΡΠΎΠΏΠ»ΠΈΠ²Π° Π² Π²ΠΈΠ΄Π΅ ΠΌΠΈΠΊΡΠΎΡΠ²ΡΠ»ΠΎΠ² β ΡΠ°ΡΠΈΠΊΠΎΠ² ΠΈΠ· Π΄Π΅Π»ΡΡΠ΅Π³ΠΎΡΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠΎΠΌ ΠΏΠΎΡΡΠ΄ΠΊΠ° ΠΌΠΈΠ»Π»ΠΈΠΌΠ΅ΡΡΠ°, ΠΏΠΎΠΊΡΡΡΡΡ
Π·Π°ΡΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΠΎΠ»ΠΎΡΠΊΠΎΠΉ Π΄Π»Ρ ΡΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΡΠ°Π΄ΠΈΠΎΠ°ΠΊΡΠΈΠ²Π½ΡΡ
ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ² Π΄Π΅Π»Π΅Π½ΠΈΡ. ΠΡΠΌΠ΅ΡΠ΅Π½ΠΎ, ΡΡΠΎ ΡΡΠΏΡΡΠ΅ΡΡΡ, Π±ΠΎΠ»ΡΡΠ°Ρ ΡΠ΄Π΅Π»ΡΠ½Π°Ρ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΡ ΡΠ΅ΠΏΠ»ΠΎΡΡΠ΅ΠΌΠ°, Π½Π΅ΠΎΠ±ΡΡΠ°ΠΉΠ½ΠΎ Π²ΡΡΠΎΠΊΠ°Ρ ΡΡΠΎΠΉΠΊΠΎΡΡΡ ΠΌΠΈΠΊΡΠΎΡΠ²ΡΠ»ΠΎΠ² ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ Π½Π° ΠΈΡ
Π±Π°Π·Π΅ ΠΏΡΠΎΠ΅ΠΊΡΠΈΡΠΎΠ²Π°ΡΡ ΠΈΠ½Π½ΠΎΠ²Π°ΡΠΈΠΎΠ½Π½ΡΠ΅ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΡΠ΅ ΡΠ΅Π°ΠΊΡΠΎΡΡ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠ³ΠΎ ΡΠ΅Π»Π΅Π²ΠΎΠ³ΠΎ Π½Π°Π·Π½Π°ΡΠ΅Π½ΠΈΡ (ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ°Π±Π΅Π»ΡΠ½ΡΠ΅, Π±ΡΠΈΠ΄Π΅ΡΡ, Π²ΡΡΠΎΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΡΠ΅, Π²ΡΡΠΎΠΊΠΎΠΏΠΎΡΠΎΡΠ½ΡΠ΅ ΠΈ Ρ. Π΄.). ΠΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ°ΡΠΈΡ Π°ΠΊΡΠΈΠ²Π½ΠΎΠΉ Π·ΠΎΠ½Ρ ΡΠ΅Π°ΠΊΡΠΎΡΠ° Ρ Π½Π°ΡΡΠΏΠ½ΡΠΌΠΈ ΡΠ΅ΠΏΠ»ΠΎΠ²ΡΠ΄Π΅Π»ΡΡΡΠΈΠΌΠΈ ΡΠ±ΠΎΡΠΊΠ°ΠΌΠΈ. Π Π½ΠΈΡ
Π³Π°ΡΠΌΠΎΠ½ΠΈΡΠ½ΠΎ ΡΠΎΡΠ΅ΡΠ°ΡΡΡΡ Π΄ΠΎΡΡΠΎΠΈΠ½ΡΡΠ²Π° ΠΌΠΈΠΊΡΠΎΡΠ²ΡΠ»ΠΎΠ² Ρ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π°ΠΌΠΈ Π±ΠΎΠΊΠΎΠ²ΠΎΠ³ΠΎ ΠΏΠΎΠ΄Π²ΠΎΠ΄Π° ΡΠ΅ΠΏΠ»ΠΎΠ½ΠΎΡΠΈΡΠ΅Π»Ρ ΠΊ ΡΠΎΠΏΠ»ΠΈΠ²Π½ΠΎΠΌΡ ΡΠ»ΠΎΡ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΡΡ
ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈ ΠΎΡΠ²ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΊΠ°Π½Π°Π»ΠΎΠ². ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π° ΡΡ
Π΅ΠΌΠ° Π½Π°ΡΡΠΏΠ½ΠΎΠΉ ΡΠ±ΠΎΡΠΊΠΈ ΠΈ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΠΏΠΎΡΠΎΠΊΠ° Π² ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΡΡ
ΠΊΠ°Π½Π°Π»Π°Ρ
. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠ΅Π΅ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΎΠΏΠΈΡΠ°Π½ΠΈΠ΅ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΡΠ΅ΠΏΠ»ΠΎΠ½ΠΎΡΠΈΡΠ΅Π»Ρ Π² Π½ΠΈΡ
ΠΎΡΠ»ΠΈΡΠ°Π΅ΡΡΡ Π½Π΅ΠΎΠ΄Π½ΠΎΠ·Π½Π°ΡΠ½ΠΎΡΡΡΡ ΠΈ ΠΏΡΠΎΡΠΈΠ²ΠΎΡΠ΅ΡΠΈΠ²ΠΎΡΡΡΡ. ΠΠ»Ρ ΡΡΡΡΠ°Π½Π΅Π½ΠΈΡ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΎΠ² Π² ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΠΎΡΡΡΠΎΠ΅Π½ Π½ΠΎΠ²ΡΠΉ ΠΊΠΈΠ½Π΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΎΠ±ΡΠ°Π· ΡΠ΅ΡΠ΅Π½ΠΈΡ Π² ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΠΌ ΠΊΠ°Π½Π°Π»Π΅ Π²Π·Π°ΠΌΠ΅Π½ ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠ΅Π³ΠΎ, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΡΡΠ΅Π³ΠΎ ΡΠΎΠ±ΠΎΠΉ ΡΡΡΡΡ, ΠΊ ΠΊΠΎΡΠΎΡΠΎΠΉ Π½Π° ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΠΉ ΡΡΠ΅Π½ΠΊΠ΅ Π½Π΅ΠΏΡΠ΅ΡΡΠ²Π½ΠΎ ΠΏΡΠΈΡΠΎΠ΅Π΄ΠΈΠ½ΡΡΡΡΡ ΠΈΠ»ΠΈ ΠΎΡΠ΄Π΅Π»ΡΡΡΡΡ ΠΎΡ Π½Π΅Π΅ ΡΠ°ΡΡΠΈΡΡ ΡΠ΅ΠΏΠ»ΠΎΠ½ΠΎΡΠΈΡΠ΅Π»Ρ. ΠΠ²ΠΈΠΆΠ΅Π½ΠΈΠ΅ Π² ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΠΌ ΠΊΠ°Π½Π°Π»Π΅ Π² Π½ΠΎΠ²ΠΎΠΉ ΡΡΠ°ΠΊΡΠΎΠ²ΠΊΠ΅ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ ΠΊΠ°ΠΊ ΠΏΠΎΠ²ΠΎΡΠΎΡ ΠΏΠΎΡΠΎΠΊΠ° ΠΏΡΠΈ ΠΎΠ΄Π½ΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΌ Π΅Π³ΠΎ ΡΠ°ΡΡΠΈΡΠ΅Π½ΠΈΠΈ ΠΈΠ»ΠΈ ΡΡΠΆΠ΅Π½ΠΈΠΈ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΡΠΎΠ³ΠΎ, ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΡ Π² ΠΊΠ°Π½Π°Π»Π΅ ΠΎΡΡΠΎΠΊ ΠΈΠ»ΠΈ ΠΏΡΠΈΡΠΎΠΊ. ΠΠ° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠ°ΠΊΠΎΠ³ΠΎ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ΠΈΡ ΠΏΠΎΠ»ΡΡΠ΅Π½ΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π΄Π°Π²Π»Π΅Π½ΠΈΡ ΡΠ΅ΠΏΠ»ΠΎΠ½ΠΎΡΠΈΡΠ΅Π»Ρ Π² ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΠΌ ΠΊΠ°Π½Π°Π»Π΅, ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π° ΡΠ΅Π°ΠΊΡΠΈΡ ΠΏΠΎΡΠΎΠΊΠ° Π½Π° ΠΏΡΠΈΡΠ°ΡΠ΅Π½ΠΈΠ΅ ΡΠ°ΡΡ
ΠΎΠ΄Π°, ΠΎΠΏΠΈΡΠ°Π½Π° Π²Π΅Π»ΠΈΡΠΈΠ½Π° ΠΊΠ°ΡΠ°ΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠΎΡΡΠ°Π²Π»ΡΡΡΠ΅ΠΉ Π²Π΅ΠΊΡΠΎΡΠ° ΡΠΊΠΎΡΠΎΡΡΠΈ Π½Π° ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΠΉ ΡΡΠ΅Π½ΠΊΠ΅, ΡΠ΅ΠΌ ΡΠ°ΠΌΡΠΌ ΡΡΡΡΠ°Π½Π΅Π½Ρ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΈ ΠΎΠΏΠΈΡΠ°Π½ΠΈΡ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΡΠ΅ΠΏΠ»ΠΎΠ½ΠΎΡΠΈΡΠ΅Π»Ρ Π² ΠΊΠ°Π½Π°Π»Π°Ρ
Π½Π°ΡΡΠΏΠ½ΠΎΠΉ ΡΠ±ΠΎΡΠΊΠΈ. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ³ΡΡ ΡΠ°ΠΊΠΆΠ΅ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡΡΡ ΠΏΡΠΈ ΠΏΡΠΎΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ Π΄ΡΡΠ³ΠΈΡ
ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΡΡΠΎΠΉΡΡΠ², ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΡ
ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΡΠ΅ ΠΊΠ°Π½Π°Π»Ρ
Antiproton-Hydrogen annihilation at sub-kelvin temperatures
The main properties of the interaction of ultra low-energy antiprotons ( a.u.) with atomic hydrogen are established. They include the
elastic and inelastic cross sections and Protonium (Pn) formation spectrum. The
inverse Auger process () is taken into account in the
framework of an unitary coupled-channels model. The annihilation cross-section
is found to be several times smaller than the predictions made by the black
sphere absorption models. A family of nearthreshold metastable
states is predicited. The dependence of Protonium formation probability on the
position of such nearthreshold S-matrix singularities is analysed. An
estimation for the annihilation cross section is obtained.Comment: latex.tar.gz file, 22 pages, 9 figure
Influence of the annealing temperature on the ferroelectric properties of niobium-doped strontiumβbismuth tantalate
Characteristics of ferroelectric thin films of nio-bium-doped strontiumβbismuth tantalite (SBTN), which were deposited by magnetron sputtering on Pt/TiO2/SiO2/Si substrates, are investigated. To form the ferroelectric structure, deposited films were subjected to subsequent annealing at 700β800Β°C in an O2 atmosphere. The results of X-ray diffraction showed that the films immediately after the deposition have
an amorphous structure. Annealing at 700β800Β°C results in the formation of the Aurivillius struc-ture. The dependences of permittivity, residual polariza-tion, and the coercitivity of SBTN films on the modes of subsequent annealing are established. Films with residual polarization 2Pr = 9.2 ΞΌC/cm2, coercitivity 2Ec = 157 kV/cm, and leakage current 10β6 A/cm2 are obtained at the annealing temperature of 800Β°C. The dielectric constant and loss tangent at fre-quency of 1.0 MHz were Ξ΅ = 152 and tanΞ΄ = 0.06. The ferroelectric characteristics allow us to use the SBTN films in the capacitor cell of high density ferroelectric random-access non-volatile memory (FeRAM)
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