677 research outputs found
Method for the Optimal Design of Vacuum-Evaporative Heat Pumps
A method is developed for optimally designing vacuum-evaporative heat pumps that use water (R718) as a refrigerant. This method is based on the autonomous method of the thermoeconomic optimization of thermodynamic systems, and makes it possible, when optimizing the design and choosing economical modes of system operation, to simultaneously take into account both thermodynamic and economic parameters.ΠΠ° Π±Π°Π·Ρ Π°Π²ΡΠΎΠ½ΠΎΠΌΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Ρ ΡΠ΅ΡΠΌΠΎΠ΅ΠΊΠΎΠ½ΠΎΠΌΡΡΠ½ΠΎΡ ΠΎΠΏΡΠΈΠΌΡΠ·Π°ΡΡΡ ΡΠ΅ΡΠΌΠΎΠ΄ΠΈΠ½Π°ΠΌΡΡΠ½ΠΈΡ
ΡΠΈΡΡΠ΅ΠΌ ΡΠΎΠ·ΡΠΎΠ±Π»Π΅Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΠ΅ΠΊΡΡΠ²Π°Π½Π½Ρ Π²Π°ΠΊΡΡΠΌΠ½ΠΎ-Π²ΠΈΠΏΠ°ΡΠ½ΠΈΡ
ΡΠ΅ΠΏΠ»ΠΎΠ²ΠΈΡ
Π½Π°ΡΠΎΡΡΠ², ΡΠΎ Π²ΠΈΠΊΠΎΡΠΈΡΡΠΎΠ²ΡΡΡΡ Π²ΠΎΠ΄Ρ (R718) ΡΠΊ Ρ
ΠΎΠ»ΠΎΠ΄ΠΎΠ°Π³Π΅Π½Ρ. Π¦Ρ ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° Π΄ΠΎΠ·Π²ΠΎΠ»ΡΡ ΠΏΡΠ΄ ΡΠ°Ρ ΠΎΠΏΡΠΈΠΌΡΠ·Π°ΡΡΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΡΡ Ρ Π²ΠΈΠ±ΠΎΡΡ Π΅ΠΊΠΎΠ½ΠΎΠΌΡΡΠ½ΠΈΡ
ΡΠ΅ΠΆΠΈΠΌΡΠ² ΡΠΎΠ±ΠΎΡΠΈ ΡΠΈΡΡΠ΅ΠΌΠΈ ΠΎΠ΄Π½ΠΎΡΠ°ΡΠ½ΠΎ Π²ΡΠ°Ρ
ΠΎΠ²ΡΠ²Π°ΡΠΈ ΡΠΊ ΡΠ΅ΡΠΌΠΎΠ΄ΠΈΠ½Π°ΠΌΡΡΠ½Ρ, ΡΠ°ΠΊ Ρ Π΅ΠΊΠΎΠ½ΠΎΠΌΡΡΠ½Ρ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΈ.ΠΠ° Π±Π°Π·Π΅ Π°Π²ΡΠΎΠ½ΠΎΠΌΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ΅ΡΠΌΠΎΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΡΠ΅ΡΠΌΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΈΡΡΠ΅ΠΌ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΠ΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π²Π°ΠΊΡΡΠΌΠ½ΠΎ-ΠΈΡΠΏΠ°ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΡΠ΅ΠΏΠ»ΠΎΠ²ΡΡ
Π½Π°ΡΠΎΡΠΎΠ², ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡΡΠΈΡ
Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Ρ
Π»Π°Π΄Π°Π³Π΅Π½ΡΠ° Π²ΠΎΠ΄Ρ (R718). ΠΡΠ° ΠΌΠ΅ΡΠΎΠ΄ΠΈΠΊΠ° ΠΏΠΎΠ·Π²ΠΎΠ»ΡΠ΅Ρ ΠΏΡΠΈ ΠΎΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠΈ ΠΈ Π²ΡΠ±ΠΎΡΠ΅ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ½ΡΡ
ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΡΠ°Π±ΠΎΡΡ ΡΠΈΡΡΠ΅ΠΌΡ ΠΎΠ΄Π½ΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎ ΡΡΠΈΡΡΠ²Π°ΡΡ ΠΊΠ°ΠΊ ΡΠ΅ΡΠΌΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅, ΡΠ°ΠΊ ΠΈ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ
Instanton bundles on Fano threefolds
We introduce the notion of an instanton bundle on a Fano threefold of index
2. For such bundles we give an analogue of a monadic description and discuss
the curve of jumping lines. The cases of threefolds of degree 5 and 4 are
considered in a greater detail.Comment: 31 page, to appear in CEJ
Semiclassical Study of Baryon and Lepton Number Violation in High-Energy Electroweak Collisions
We make use of a semiclassical method for calculating the suppression
exponent for topology changing transitions in high-energy electroweak
collisions. In the Standard Model these processes are accompanied by violation
of baryon and lepton number. By using a suitable computational technique we
obtain results for s-wave scattering in a large region of initial data. Our
results show that baryon and lepton number violation remains exponentially
suppressed up to very high energies of at least 30 sphaleron masses (250 TeV).
We also conclude that the known analytic approaches inferred from low energy
expansion provide reasonably good approximations up to the sphaleron energy (8
TeV) only.Comment: 23 pages, 18 figures. Phys.Rev.D journal version (two references
added
Copper Recovery from Water of Soryinskoye Tailing Pond
The large volume of recycling waters from the Soryinskoye tailing pond (up to 1300 m3/h) offers interesting possibilities for processing concentrates despite the low copper content (5.2-16.4 mg/l). Sulfides precipitation is the most efficient method of heavy metal ions removal from water. In this study, a sulfur solution in sodium hydroxide was used as a sulfidizing agent for precipitation. Commercial liquid alkali (NaOH β 46) and commercial sulfur were the initial agents. Due to the concentrated alkali, dissolution could be carried out at 115-120βΠ‘, which is higher than the melting point of sulfur. Stable solutions were obtained at a weight ratio of NaOH: S = 1: 1 and a sulfur concentration of 350 g/l. During the laboratory and scale-up laboratory tests, the optimal consumption of sulfidizing agent was determined (110% of the stoichiometry for the formation of Cu2S, and copper extraction into the precipitate from the solution was more than 90.0% with high selectivity towards Zn and Fe). An extended analysis of the composition of the sediment (x-ray fluorescence spectrometer SPECTRO XEPOS) obtained during pilot trials showed that the main elements are, %: sulfur 58.4; oxygen 16.2; copper 8.9; iron 5.7; calcium 4.7 and arsenic 3.8. The total fraction of impurity elements does not exceed 2.3%. This study assumes use of the product conditioning to obtain concentrate with increased copper content and sulfur return to sulfidation stage.
Keywords: acid mine drainage, copper recovery, chemical treatment, sulfide precipitatio
Multipoint Vernier VISAR Interferometer System for Measuring Mass Velocity in Shock Wave Experiments
AbstractThe results of development of a laser interferometer designed to measure the mass velocity of condensed substances in shock wave experiments in the field of high energy density physics are presented. The developed laser system allows measurements of the velocity of free surfaces of samples in shockwave experiments with accuracy no worse than 10 m/s for the entire range of velocities attained experimentally. The time resolution of measurements is limited by the response speed of the used PMTs and amounts to 2.5 ns
ΠΡΡΠΎΡΠΈΡ ΠΈ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΡΡΡ ΠΊΠ°ΡΠ΅Π΄ΡΡ Π±ΠΎΡΠ°Π½ΠΈΠΊΠΈ, ΡΠΈΠ·ΠΈΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ°ΡΡΠ΅Π½ΠΈΠΉ ΠΈ Π°Π³ΡΠΎΠ±ΠΈΠΎΡΠ΅Ρ Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ
The article presents the formation and development history, modern educational and scientific activity of the Chair of botany, plant physiology and agrobiotechnology - the oldest chair of the Agrarian faculty of PFUR.Π ΡΡΠ°ΡΡΠ΅ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Π° ΠΈΡΡΠΎΡΠΈΡ ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½Π°Ρ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½Π°Ρ ΠΈ Π½Π°ΡΡΠ½Π°Ρ Π΄Π΅ΡΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΊΠ°ΡΠ΅Π΄ΡΡ Π±ΠΎΡΠ°Π½ΠΈΠΊΠΈ, ΡΠΈΠ·ΠΈΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ°ΡΡΠ΅Π½ΠΈΠΉ ΠΈ Π°Π³ΡΠΎΠ±ΠΈΠΎΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ - ΡΡΠ°ΡΠ΅ΠΉΡΠ΅ΠΉ ΠΊΠ°ΡΠ΅Π΄ΡΡ Π°Π³ΡΠ°ΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΠΊΡΠ»ΡΡΠ΅ΡΠ° Π Π£ΠΠ
Electrophysical properties of meso-porous silicon free standing films modified with palladium
Resistivity and complex impedance voltage dependences for thick mesoporous
silicon free layers were studied in this work. The asymmetrical by the sign of
applied voltage experimental curves at low frequencies have been obtained. Modification
of electrophysical properties due to introduction of palladium particles into the porous
matrix is observed. Impedance change regularities during oxidation of the samples have
been measured. The explanation of experimental results by asymmetrical distribution of
charge carrier traps in the bulk of porous silicon has been suggested. Energy band
diagrams and charge transfer mechanisms of these heterostructures are discussed
Conjugate Heat Transfer During Viscous Incompressible Liquid Movement in the Cavity Considering its Cooling Through Outer Boundary
Instanton propagator and instanton induced processes in scalar model
The propagator in the instanton background in the
scalar model in four dimensions is studied.Leading and sub-leading terms of its
asymptotics for large momenta and its on-shell double residue are calculated
analytically. These results are applied to the analysis of the initial-state
and initial-final-state corrections and the calculation of the next-to-leading
(propagator) correction to the exponent of the cross section of instanton
induced multiparticle scattering processes.Comment: 44 pages, 7 postscript figures, LaTe
Instabilities in the two-dimensional cubic nonlinear Schrodinger equation
The two-dimensional cubic nonlinear Schrodinger equation (NLS) can be used as
a model of phenomena in physical systems ranging from waves on deep water to
pulses in optical fibers. In this paper, we establish that every
one-dimensional traveling wave solution of NLS with trivial phase is unstable
with respect to some infinitesimal perturbation with two-dimensional structure.
If the coefficients of the linear dispersion terms have the same sign then the
only unstable perturbations have transverse wavelength longer than a
well-defined cut-off. If the coefficients of the linear dispersion terms have
opposite signs, then there is no such cut-off and as the wavelength decreases,
the maximum growth rate approaches a well-defined limit.Comment: 4 pages, 4 figure
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