557 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
Processing Behavior of Electrodes Made with Addition of Nanopowder
The study analyzes the processing behavior of welding electrodes made with addition of nanopowder, and compares them to standard welding electrodes (without addition of nanopowder). The effect of nanopowder of complex composition on the electrode metal transfer process is analyzed as well
ΠΠ€Π€ΠΠΠ’Π« Π ΠΠΠΠ¬ΠΠΠ Π ΠΠΠΠΠΠΠ Π£ΠΠΠΠ ΠΠΠΠ ΠΠΠ ΠΠΠΠ’ΠΠ¦ΠΠ ΠΠ ΠΠΠΠΠ’ΠΠ Π«Π Π‘Π’Π Π£ΠΠ’Π£Π ΠΠ-ΠΠΠ’ΠΠΠΠΠΠ§ΠΠ‘ΠΠΠ ΠΠΠ ΠΠΠΠ’Π Π« Π‘ΠΠΠΠΠ’ΠΠ«Π₯ ΠΠ«Π¨Π¦
The aim of present publication is summarization of experimental results on real and modeled effects of zero gravity on the impellent device of a man and other mammals. In particular, its effects on high-speed and power characteristics of skeletal muscles depending on their metabolic activity are analyzed.Β Π Π½Π°ΡΡΠΎΡΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠΎΠ² Ρ ΡΠ΅Π°Π»ΡΠ½ΡΠΌΠΈ ΠΈ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΡΠ΅ΠΌΡΠΌΠΈ ΡΡΡΠ΅ΠΊΡΠ°ΠΌΠΈ Π½Π΅Π²Π΅ΡΠΎΠΌΠΎΡΡΠΈ Π½Π° Π΄Π²ΠΈΠ³Π°ΡΠ΅Π»ΡΠ½ΡΠΉ Π°ΠΏΠΏΠ°ΡΠ°Ρ ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° ΠΈ Π΄ΡΡΠ³ΠΈΡ
ΠΌΠ»Π΅ΠΊΠΎΠΏΠΈΡΠ°ΡΡΠΈΡ
. Π ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ, ΠΏΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½ΠΎ Π΅Π΅ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π½Π° ΡΠΊΠΎΡΠΎΡΡΠ½ΠΎ-ΡΠΈΠ»ΠΎΠ²ΡΠ΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΡΠΊΠ΅Π»Π΅ΡΠ½ΡΡ
ΠΌΡΡΡ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΠΈΡ
ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΡΠ΅ΡΠΊΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ.
Effect of physical exercises and perceived stress interaction on studentsβ satisfaction with life
Purpose : to find out the effect of regular physical exercises and perceived stress interaction on studentsβ satisfaction with life. Material and methods : The study involved university students (n = 355; Π age = 19,97; SD = 2,12). The moderator analysis was conducted according to the cross-sectional questionnaire. Results : It is determined that the difference in students' satisfaction with life at the average and high perceived stress is due to physical exercises. The influence of the interaction of variables (physical activity x perceived stress) on satisfaction with life was statistically significant. Conclusions : It is revealed the peculiarities of interaction between the physical exercises and perceived stress. The reduce of satisfaction with life under the influence of perceived stress is more typical for those students who do not regularly practice physical exercises. Physical exercises act as a buffer against stress
Electron-optical system of 200 kV gun for the VEPP-5 preinjector
The electron gun with a new electron-optical system to match project parameters of the VEPP-5 preinjector is
described. The gun produces the current with 10 A amplitude, pulse duration 2...3 ns at half-height and electron energy 200 keV. The gun has a dispenser cathode 20 mm in diameter and 100 mm spherical radius. The current control is performed by means of molybdenum equipotential grid with the cell size 0.4Β·0.4 mm and optical transparency
of about 0.68. The experimental results obtained are in good agreement with project parameters.ΠΠΏΠΈΡΠ°Π½ΠΎ Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π½Ρ Π³Π°ΡΠΌΠ°ΡΡ Π· Π½ΠΎΠ²ΠΎΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎ-ΠΎΠΏΡΠΈΡΠ½ΠΎΡ ΡΠΈΡΡΠ΅ΠΌΠΎΡ, ΡΠΎ Π²ΡΠ΄ΠΏΠΎΠ²ΡΠ΄Π°Ρ ΠΏΡΠΎΠ΅ΠΊΡΠ½ΠΈΠΌ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌ ΠΏΠ΅ΡΠ΅Π΄ΡΠ½ΠΆΠ΅ΠΊΡΠΎΡΠ° VEPP-5. ΠΠ°ΡΠΌΠ°ΡΠ° Π΄Π°Ρ ΡΡΡΡΠΌ 10 Π Ρ ΡΡΠΈΠ²Π°Π»ΡΡΡΡ ΡΠΌΠΏΡΠ»ΡΡΡ 2...3 Π½Ρ Π½Π° Π½Π°ΠΏΡΠ²Π²ΠΈΡΠΎΡΡ Ρ
Π· Π΅Π½Π΅ΡΠ³ΡΡΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ½ΡΠ² 200 ΠΊΠ΅Π. ΠΠ°ΡΠΌΠ°ΡΠ° ΠΌΠ°Ρ Π΄ΠΈΡΠΏΠ΅ΡΠ³ΡΡΠΌΠΈΠΉ ΠΊΠ°ΡΠΎΠ΄ Π΄ΡΠ°ΠΌΠ΅ΡΡΠΎΠΌ 20 ΠΌΠΌ Ρ ΡΠ°Π΄ΡΡΡΠΎΠΌ ΡΡΠ΅ΡΠΈ 100 ΠΌΠΌ.
ΠΠ΅ΡΡΠ²Π°Π½Π½Ρ Π·Π΄ΡΠΉΡΠ½ΡΡΡΡΡΡ Π·Π° Π΄ΠΎΠΏΠΎΠΌΠΎΠ³ΠΎΡ ΠΌΠΎΠ»ΡΠ±Π΄Π΅Π½ΠΎΠ²ΠΎΡ Π΅ΠΊΠ²ΡΠΏΠΎΡΠ΅Π½ΡΡΠΉΠ½ΠΎΡ ΡΡΡΠΊΠΈ Π· ΠΊΠΎΠΌΡΡΠΊΠΎΡ ΡΠΎΠ·ΠΌΡΡΠΎΠΌ 0.4Β·0.4 ΠΌΠΌ Ρ
ΠΎΠΏΡΠΈΡΠ½ΠΎΡ ΠΏΡΠΎΠ·ΠΎΡΡΡΡΡ Π±Π»ΠΈΠ·ΡΠΊΠΎ 0.68. ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎ ΠΎΡΡΠΈΠΌΠ°Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΈ Π·Π½Π°Ρ
ΠΎΠ΄ΡΡΡΡΡ Ρ Π²ΡΠ΄ΠΏΠΎΠ²ΡΠ΄Π½ΠΎΡΡΡ Π·
ΠΏΡΠΎΠ΅ΠΊΡΠ½ΠΈΠΌΠΈ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌΠΈ.ΠΠΏΠΈΡΠ°Π½Π° ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½Π°Ρ ΠΏΡΡΠΊΠ° Ρ Π½ΠΎΠ²ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎ-ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ, ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠ°Ρ ΠΏΡΠΎΠ΅ΠΊΡΠ½ΡΠΌ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌ ΠΏΡΠ΅Π΄ΡΠ½ΠΆΠ΅ΠΊΡΠΎΡΠ° VEPP-5. ΠΡΡΠΊΠ° Π΄Π°Π΅Ρ ΡΠΎΠΊ 10 Π Ρ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡΡ ΠΈΠΌΠΏΡΠ»ΡΡΠ° 2β¦3 Π½Ρ Π½Π° ΠΏΠΎΠ»ΡΠ²ΡΡΠΎΡΠ΅ ΠΈ
Ρ ΡΠ½Π΅ΡΠ³ΠΈΠ΅ΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΎΠ² 200 ΠΊΡΠ. ΠΡΡΠΊΠ° ΠΈΠΌΠ΅Π΅Ρ Π΄ΠΈΡΠΏΠ΅ΡΠ³ΠΈΡΡΠ΅ΠΌΡΠΉ ΠΊΠ°ΡΠΎΠ΄ Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠΎΠΌ 20 ΠΌΠΌ ΠΈ ΡΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΌ ΡΠ°Π΄ΠΈΡΡΠΎΠΌ ΡΡΠ΅ΡΡ 100 ΠΌΠΌ. Π£ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΠΎΡΡΡΠ΅ΡΡΠ²Π»ΡΠ΅ΡΡΡ ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²ΠΎΠΌ ΠΌΠΎΠ»ΠΈΠ±Π΄Π΅Π½ΠΎΠ²ΠΎΠΉ ΡΠΊΠ²ΠΈΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠΊΠΈ Ρ
ΡΡΠ΅ΠΉΠΊΠΎΠΉ ΡΠ°Π·ΠΌΠ΅ΡΠΎΠΌ 0.4Β·0.4 ΠΌΠΌ ΠΈ ΠΎΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠΎΠ·ΡΠ°ΡΠ½ΠΎΡΡΠΈ ΠΎΠΊΠΎΠ»ΠΎ 0.68. ΠΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠ΅ ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π½Π°Ρ
ΠΎΠ΄ΡΡΡΡ Π² Ρ
ΠΎΡΠΎΡΠ΅ΠΌ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΠΏΡΠΎΠ΅ΠΊΡΠ½ΡΠΌΠΈ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌΠΈ
Diagnostics of evolution of risk collapse complications at student group with anomalous cardiovascular reaction
The description of investigation of predisposition to potential danger of collapse complications at 429 first-year students during physical training is presented using the analysis of pulse wave form. With the help of developed device the group of students with predisposition to risk of collapse complications during physical activity has been revealed. The results of clinical examination have confirmed the predisposition of the given group to risk of collapse complication
Discrete skew selfadjoint canonical systems and the isotropic Heisenberg magnet model
A discrete analog of a skew selfadjoint canonical (Zakharov-Shabat or AKNS)
system with a pseudo-exponential potential is introduced. For the corresponding
Weyl function the direct and inverse problem are solved explicitly in terms of
three parameter matrices. As an application explicit solutions are obtained for
the discrete integrable nonlinear equation corresponding to the isotropic
Heisenberg magnet model. State space techniques from mathematical system theory
play an important role in the proofs
Transverse instability and its long-term development for solitary waves of the (2+1)-Boussinesq equation
The stability properties of line solitary wave solutions of the
(2+1)-dimensional Boussinesq equation with respect to transverse perturbations
and their consequences are considered. A geometric condition arising from a
multi-symplectic formulation of this equation gives an explicit relation
between the parameters for transverse instability when the transverse
wavenumber is small. The Evans function is then computed explicitly, giving the
eigenvalues for transverse instability for all transverse wavenumbers. To
determine the nonlinear and long time implications of transverse instability,
numerical simulations are performed using pseudospectral discretization. The
numerics confirm the analytic results, and in all cases studied, transverse
instability leads to collapse.Comment: 16 pages, 8 figures; submitted to Phys. Rev.
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