871 research outputs found
Energy States of Colored Particle in a Chromomagnetic Field
The unitary transformation, which diagonalizes squared Dirac equation in a
constant chromomagnetic field is found. Applying this transformation, we find
the eigenfunctions of diagonalized Hamiltonian, that describe the states with
definite value of energy and call them energy states. It is pointed out that,
the energy states are determined by the color interaction term of the particle
with the background chromofield and this term is responsible for the splitting
of the energy spectrum.
We construct supercharge operators for the diagonal Hamiltonian, that ensure
the superpartner property of the energy states.Comment: 25 pages, some calculation details have been removed, typos correcte
The indisputable value of ultrasound diagnostics in acute small bowel obstruction
The use of ultrasound in the diagnosis of acute small bowel obstruction is justified from a tactical point of view, since it is not delayed in time, does not weigh down the patient's condition, has sufficient information and does not carry radiation load. Due to its safety and ease of use, this technique can be used repeatedly in the process of conservative treatment to determine further treatment tactics
Condensation of 4-hydroxy-2-thiazolines with 1,2-phenylenediamine as a novel effective route to thiazolo[3,4-a]quinoxalines
Thiazolo[3,4-a]quinoxalin-4-ones were prepared in two steps starting from methyl phenylchloropyruvate using a new strategy for the construction of the ring system. A key step in this new method involves the reaction of 4-hydroxytetrahydrothiazoles with 1,2-phenylendiamines
Study of regularities on how drilling cuttings block pores and fractures of oil-bearing formation
Regularities on how drilling cuttings block pores and fractures of oil-bearing formation are studied.
There are complex physical and chemical processes at well bottomhole occur during entering oil-bearing formation by rotary or rope drilling. That is caused by quality of drilling fluid, intensity of washing, rotation of a drill string, presence of cuttings at bottomhole and a drilling technique. There are hydraulic impulse effects with alternating signs in bottomhole formation zone appear during rope drilling that have a significant impact on quality of work.
Underestimation of mentioned factors during entering oil-bearing reservoirs leads to decrease in permeability of oil rocks and well production rate.
A clear understanding of physical and chemical processes at bottomhole while entering oil-bearing reservoirs and management of these processes allow to avoid reduce in conductivity of reservoir rocks to a large extent and intensify it in some cases.
The main conditions to increase efficiency of oil wells drilling are application of such methods of entering and development of an oil-bearing reservoir that ensure preservation of its natural porosity and permeability or contribute to their increase in bottomhole part of a well.
Physical and chemical parameters of oil-bearing formation are the governing factor while choosing its entering and development technology.
In recent years, great attention has been paid to issues of entering and development oil reservoirs.
Parameters such as geological and physical properties of a reservoir, physical and chemical properties of reservoir oil, rocks and washing liquid, hydrodynamic interaction in an "oil reservoir-well" system are not considered enough in a number of cases during entering and development of a formation. That often leads to incorrect conclusions about a possibility to use actual reserves for needs of national economy.
Drilling of oil-bearing formations is a technological process, which create a bore hole in a productive oil-bearing formation for equipment of oil part of a well. Bringing a well on production include technological operations that provide installation of equipment into an oil part of a well and restoration of natural oil permeability of a formation or its artificial increase to achieve maximum production rate of a well
Unoccupied Topological States on Bismuth Chalcogenides
The unoccupied part of the band structure of topological insulators
BiTeSe () is studied by angle-resolved two-photon
photoemission and density functional theory. For all surfaces
linearly-dispersing surface states are found at the center of the surface
Brillouin zone at energies around 1.3 eV above the Fermi level. Theoretical
analysis shows that this feature appears in a spin-orbit-interaction induced
and inverted local energy gap. This inversion is insensitive to variation of
electronic and structural parameters in BiSe and BiTeSe. In
BiTe small structural variations can change the character of the local
energy gap depending on which an unoccupied Dirac state does or does not exist.
Circular dichroism measurements confirm the expected spin texture. From these
findings we assign the observed state to an unoccupied topological surface
state
Opening of a pseudogap in a quasi-two dimensional superconductor due to critical thermal fluctuations
We examine the role of the anisotropy of superconducting critical thermal
fluctuations in the opening of a pseudogap in a quasi-two dimensional
superconductor such as a cuprate-oxide high-temperature superconductor. When
the anisotropy between planes and their perpendicular axis is large enough and
its superconducting critical temperature T_c is high enough, the fluctuations
are much developed in its critical region so that lifetime widths of
quasiparticles are large and the energy dependence of the selfenergy deviates
from that of Landau's normal Fermi liquids. A pseudogap opens in such a
critical region because quasiparticle spectra around the chemical potential are
swept away due to the large lifetime widths. The pseudogap never smoothly
evolves into a superconducting gap; it starts to open at a temperature higher
than T_c while the superconducting gap starts to open just at T_c. When T_c is
rather low but the ratio of varepsilon_G(0)/k_BT_c, with varepsilon_G(0) the
superconducting gap at T=0K and k_B the Boltzmann constant, is much larger than
a value about 4 according to the mean-field theory, the pseudogap must be
closing as temperature T approaches to the low T_c because thermal fluctuations
become less developed as T decreases. Critical thermal fluctuations cannot
cause the opening of a prominent pseudogap in an almost isotropic three
dimensional superconductor, even if its T_c is high.Comment: 25 pages, 5 figures (14 subfigures
ΠΡΠ΅Π½ΠΊΠ° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΊΠΎΠΌΠ±ΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΠΏΠΎΡΠΎΠ±ΠΎΠ² ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ Π½Π΅ΡΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ²ΠΎΠ² ΠΊΠΈΡΠ΅ΡΠ½ΡΡ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·ΠΎΠ²
Π¦Π΅Π»Ρ. ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠΏΠΎΡΠΎΠ±ΠΎΠ² ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ Π½Π΅ΡΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ²ΠΎΠ² ΠΊΠΈΡΠ΅ΡΠ½ΡΡ
Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·ΠΎΠ² (ΠΠ¨ΠΠ) Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
ΠΏΠΎΡΠ»Π΅ ΠΏΠ»Π°Π½ΠΎΠ²ΠΎΠΉ, ΡΠΊΡΡΡΠ΅Π½Π½ΠΎΠΉ ΠΈ Π½Π΅ΠΎΡΠ»ΠΎΠΆΠ½ΠΎΠΉ ΡΠ΅Π·Π΅ΠΊΡΠΈΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠ΅Π³ΠΌΠ΅Π½ΡΠΎΠ² ΠΊΠΈΡΠ΅ΡΠ½ΠΈΠΊΠ°.
ΠΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. ΠΠ·ΡΡΠ΅Π½ΠΎ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π»Π΅ΡΠ΅Π½ΠΈΡ 642 Π±ΠΎΠ»ΡΠ½ΡΡ
, ΠΊΠΎΡΠΎΡΡΠΌ Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΡΠ΅Π·Π΅ΠΊΡΠΈΡ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠ΅Π³ΠΌΠ΅Π½ΡΠΎΠ² ΡΠΎΠ½ΠΊΠΎΠΉ ΠΈ ΡΠΎΠ»ΡΡΠΎΠΉ ΠΊΠΈΡΠΎΠΊ Ρ Π½Π°Π»ΠΎΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠ΅ΡΠ²ΠΈΡΠ½ΡΡ
Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·ΠΎΠ². ΠΠ· 642 Π±ΠΎΠ»ΡΠ½ΡΡ
357 (55,6%) ΠΎΠΏΠ΅ΡΠΈΡΠΎΠ²Π°Π½Ρ Π² ΠΏΠ»Π°Π½ΠΎΠ²ΠΎΠΌ ΠΏΠΎΡΡΠ΄ΠΊΠ΅, 285 (44,4%) - ΠΏΠΎ Π½Π΅ΠΎΡΠ»ΠΎΠΆΠ½ΡΠΌ ΠΈ ΡΠΊΡΡΡΠ΅Π½Π½ΡΠΌ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΈΡΠΌ. Π£ 467 (72,7%) Π±ΠΎΠ»ΡΠ½ΡΡ
Π½Π°Π»ΠΎΠΆΠ΅Π½Ρ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·Ρ ΠΏΠΎ ΡΠΈΠΏΡ Π±ΠΎΠΊ Π² Π±ΠΎΠΊ, Ρ 150 (23,4%) - ΠΏΠΎ ΡΠΈΠΏΡ ΠΊΠΎΠ½Π΅Ρ Π² ΠΊΠΎΠ½Π΅Ρ, Ρ 25 (3,8%) - ΠΏΠΎ ΡΠΈΠΏΡ ΠΊΠΎΠ½Π΅Ρ Π² Π±ΠΎΠΊ. Π‘ ΡΠ΅Π»ΡΡ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΠΠ¨ΠΠ Π²ΡΠΏΠΎΠ»Π½ΡΠ»ΠΈ ΠΏΠ΅ΡΠΌΠ°Π½Π΅Π½ΡΠ½ΡΡ Π²Π½ΡΡΡΠΈΠ±ΡΡΠΆΠ΅Π΅ΡΠ½ΡΡ Π±Π»ΠΎΠΊΠ°Π΄Ρ, ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈ Π»ΠΈΠΌΡΠΎΡΡΠΎΠΏΠ½ΡΡ ΡΠ΅ΡΠ°ΠΏΠΈΡ, ΠΌΠ΅ΡΡΠ½ΡΡ Π»Π°Π·Π΅ΡΠΎΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ΅ΡΠ°ΠΏΠΈΡ, ΠΈΠ½ΡΡΠ±Π°ΡΠΈΠΎΠ½Π½ΡΡ Π΄Π΅ΠΊΠΎΠΌΠΏΡΠ΅ΡΡΠΈΡ, ΡΠ°Π½Π°ΡΠΈΡ ΠΈ Π³Π°ΡΡΡΠΎΡΠ½ΡΠ΅ΡΠΎΡΠΎΡΠ±ΡΠΈΡ Ρ ΠΏΠΎΠ»ΠΈΡΠ΅ΠΏΠ°Π½ΠΎΠΌ, Π° ΡΠ°ΠΊΠΆΠ΅ Π²Π½ΡΡΡΠΈΠΌΡΡΠ΅ΡΠ½ΠΎ Π²Π²ΠΎΠ΄ΠΈΠ»ΠΈ ΡΠ΅Π»ΠΎΠ²Π΅ΡΠ΅ΡΠΊΠΈΠΉ ΠΏΠ»Π°ΡΠ΅Π½ΡΠ°ΡΠ½ΡΠΉ Π³ΠΈΠ΄ΡΠΎΠ»ΠΈΠ·Π°Ρ Β«LaennecΒ».
Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ¨ΠΠ Π½Π°Π±Π»ΡΠ΄Π°Π»ΠΈ Ρ 10 (1,6%) Π±ΠΎΠ»ΡΠ½ΡΡ
: Ρ 6 (4,0%) - Ρ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·Π°ΠΌΠΈ ΠΊΠΎΠ½Π΅Ρ Π² ΠΊΠΎΠ½Π΅Ρ ΠΈ Ρ 4 (0,86%) - Ρ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·Π°ΠΌΠΈ Π±ΠΎΠΊ Π² Π±ΠΎΠΊ. ΠΠ΅ΡΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΡΠΌΠΈ Π±ΡΠ»ΠΈ 1 (10%) ΡΠΎΠ½ΠΊΠΎ-ΡΠΎΠ»ΡΡΠΎΠΊΠΈΡΠ΅ΡΠ½ΡΠΉ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·, 2 (20%) ΡΠΎΠ½ΠΊΠΎ-ΡΠΎΠ½ΠΊΠΎΠΊΠΈΡΠ΅ΡΠ½ΡΡ
ΠΈ 7 (70%) ΡΠΎΠ»ΡΡΠΎ-ΡΠΎΠ»ΡΡΠΎΠΊΠΈΡΠ΅ΡΠ½ΡΡ
Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·ΠΎΠ².
ΠΡΠ²ΠΎΠ΄Ρ. Π‘ ΡΠ΅Π»ΡΡ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΠΠ¨ΠΠ Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
, ΠΎΠΏΠ΅ΡΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
Π² Π½Π΅ΠΎΡΠ»ΠΎΠΆΠ½ΠΎΠΌ, ΡΠΊΡΡΡΠ΅Π½Π½ΠΎΠΌ ΠΈ ΠΏΠ»Π°Π½ΠΎΠ²ΠΎΠΌ ΠΏΠΎΡΡΠ΄ΠΊΠ΅, ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄ΡΠ΅ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ ΠΏΠΎ ΠΏΠΎΠΊΠ°Π·Π°Π½ΠΈΡΠΌ ΠΏΠ΅ΡΠΌΠ°Π½Π΅Π½ΡΠ½ΡΡ Π²Π½ΡΡΡΠΈΠ±ΡΡΠΆΠ΅Π΅ΡΠ½ΡΡ (Π·Π°Π±ΡΡΡΠΈΠ½Π½ΡΡ) Π±Π»ΠΎΠΊΠ°Π΄Ρ Ρ Π»ΠΈΠΌΡΠΎΡΡΠΎΠΏΠ½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠ΅ΠΉ, ΠΌΠ΅ΡΡΠ½ΡΡ Π»Π°Π·Π΅ΡΠΎΠΌΠ°Π³Π½ΠΈΡΠΎΡΠ΅ΡΠ°ΠΏΠΈΡ, ΠΈΠ½ΡΡΠ±Π°ΡΠΈΠΎΠ½Π½ΡΡ Π΄Π΅ΠΊΠΎΠΌΠΏΡΠ΅ΡΡΠΈΡ, ΡΠ°Π½Π°ΡΠΈΡ ΠΈ Π³Π°ΡΡΡΠΎΡΠ½ΡΠ΅ΡΠΎΡΠΎΡΠ±ΡΠΈΡ Ρ ΠΏΠΎΠ»ΠΈΡΠ΅ΠΏΠ°Π½ΠΎΠΌ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΏΡΠ΅ΠΏΠ°ΡΠ°Ρ Β«Laennec
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