22 research outputs found
Comparative analysis of the performance of selective and group repeat transmission modes in a transport protocol
We propose a model of a virtual connection controlled by a transport protocol in the selective and group failure modes as a Markov chain with discrete time that accounts for the influence of protocol parameters of window size and timeout duration for waiting for acknowledgements, probabilities of distorting segments in individual links of the data transmission path on the throughput of a transport connection. We have analyzed how the throughput of the control procedure depends on protocol parameters, level of errors in communication channels, and round-trip delay. We have proposed a method for choosing protocol parameters
Key principle of the efficient running, swimming, and flying
Empirical observations indicate striking similarities among locomotion in
terrestrial animals, birds, and fish, but unifying physical grounds are
lacking. When applied to efficient locomotion, the analytical mechanics
principle of minimum action yields two patterns of mechanical similarity via
two explicit spatiotemporal coherent states. In steady locomotory modes, the
slow muscles determining maximal optimum speeds maintain universal intrinsic
muscular pressure. Otherwise, maximal speeds are due to constant mass-dependent
stiffness of fast muscles generating a uniform force field, exceeding
gravitation. Being coherent in displacements, velocities and forces, the body
appendages of animals are tuned to natural propagation frequency through the
state-dependent elastic muscle moduli.
Key words: variational principle of minimum action (04.20.Fy), locomotion
(87.19.ru), biomechanics (87.85.G-).Comment: Submitted to the Europhysical Letter
Experimental research of neutron yield and spectrum from deuterium gas-puff z-pinch on the GIT-12 generator at current above 2 MA
The Z-pinch experiments with deuterium gas-puff surrounded by an outer plasma shell were carried out on the GIT-12 generator (Tomsk, Russia) at currents of 2 MA. The plasma shell consisting of hydrogen and carbon ions was formed by 48 plasma guns. The deuterium gas-puff was created by a fast electromagnetic valve. This configuration provides an efficient mode of the neutron production in DD reaction, and the neutron yield reaches a value above 1012 neutrons per shot. Neutron diagnostics included scintillation TOF detectors for determination of the neutron energy spectrum, bubble detectors BD-PND, a silver activation detector, and several activation samples for determination of the neutron yield analysed by a Sodium Iodide (NaI) and a high-purity Germanium (HPGe) detectors. Using this neutron diagnostic complex, we measured the total neutron yield and amount of high-energy neutrons
Comparative analysis of the performance of selective and group repeat transmission modes in a transport protocol
We propose a model of a virtual connection controlled by a transport protocol in the selective and group failure modes as a Markov chain with discrete time that accounts for the influence of protocol parameters of window size and timeout duration for waiting for acknowledgements, probabilities of distorting segments in individual links of the data transmission path on the throughput of a transport connection. We have analyzed how the throughput of the control procedure depends on protocol parameters, level of errors in communication channels, and round-trip delay. We have proposed a method for choosing protocol parameters
Analysis of the effectiveness of forward error correction in selective mode of transport protocol
Analysis of the effectiveness of forward error correction in selective mode of transport protocol
ΠΠΊΠ°Π΄Π΅ΠΌΠΈΠΊ Π ΠΠΠ Π.Π. ΠΠ΅ΡΠ°Π»ΠΊΠΈΠ½ (1916β1997) ΠΈ Π΅Π³ΠΎ ΠΌΠΈΡΠΎΠ²ΠΎΠΉ ΠΏΡΠΈΠΎΡΠΈΡΠ΅Ρ Π² Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΡΡΠΏΠ΅ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ°Π²ΠΎΠΏΡΠ»ΡΠΌΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·Π° Π² ΠΊΠ»ΠΈΠ½ΠΈΠΊΠ΅
ΠΠ΄Π΅Ρ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΠΊΠ°Π²ΠΎΠΏΡΠ»ΡΠΌΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·Π° Π²ΠΎΠ·Π½ΠΈΠΊΠ»Π° ΠΎΠ΄Π½ΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎ Ρ Ρ
ΠΈΡΡΡΠ³ΠΎΠ² Π‘Π¨Π (Π. ΠΠ»Π΅Π»ΠΎΠΊ), ΠΡΠ°Π»ΠΈΠΈ (Π. ΠΠ°ΡΠ»ΠΎΠ½), Π‘Π‘Π‘Π (Π.Π. ΠΠ°ΠΊΡΠ»Π΅Π²) ΠΈ ΠΠ΅Π½Π³ΡΠΈΠΈ (Π€. Π ΠΎΠ±ΠΈΡΠ΅ΠΊ). ΠΠ΅ΡΠ²ΡΠΉ ΠΊΠ°Π²ΠΎΠΏΡΠ»ΡΠΌΠΎΠ½Π°Π»ΡΠ½ΡΠΉ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ· Π² Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΡΡ
Π² ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ΅ Π²ΡΠΏΠΎΠ»Π½ΠΈΠ» Π. ΠΠ°ΡΠ»ΠΎΠ½ Π² ΠΊΠΎΠ½ΡΠ΅ 1949 Π³. β Π½Π°ΡΠ°Π»Π΅ 1950 Π³. ΠΠ΅ΡΠ²ΡΠ΅ Π΄Π²Π΅ Π½Π΅ΡΠ΄Π°ΡΠ½ΡΠ΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ Π² ΠΊΠ»ΠΈΠ½ΠΈΠΊΠ΅ Π²ΡΠΏΠΎΠ»Π½ΠΈΠ» Π°ΠΌΠ΅ΡΠΈΠΊΠ°Π½ΡΠΊΠΈΠΉ Ρ
ΠΈΡΡΡΠ³ Π₯.β―Π¨ΡΠΌΠ°Ρ
Π΅Ρ Π΄ΠΎ Π½ΠΎΡΠ±ΡΡ 1954 Π³. ΠΠΈΡΠΎΠ²ΠΎΠΉ ΠΏΡΠΈΠΎΡΠΈΡΠ΅Ρ Π² ΡΠ΅ΡΠΈΠΈ ΡΡΠΏΠ΅ΡΠ½ΡΡ
ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΉ Π² ΠΊΠ»ΠΈΠ½ΠΈΠΊΠ΅ ΠΏΡΠΈΠ½Π°Π΄Π»Π΅ΠΆΠΈΡ Π.Π. ΠΠ΅ΡΠ°Π»ΠΊΠΈΠ½Ρ (Ρ 3 Π°ΠΏΡΠ΅Π»Ρ ΠΏΠΎ ΠΎΠΊΡΡΠ±ΡΡ 1956 Π³.). Π ΠΈΠ·Π²Π΅ΡΡΠ½ΠΎΠΌ ΡΠΌΡΡΠ»Π΅ Π΅Π³ΠΎ ΡΡΠΏΠ΅Ρ
ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠΌΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡΠΌΠΈ, Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π½ΡΠΌΠΈ ΠΎΡΠ΅Π½ΡΡ 1955 Π³. β Π²Π΅ΡΠ½ΠΎΠΉ 1956 Π³. Π.Π. ΠΠ°Π»Π°Π½ΠΊΠΈΠ½ΡΠΌ, Π’.Π. ΠΠ°ΡΠ±ΠΈΠ½ΡΠ½ΠΎΠΌ ΠΈ Π.Π. ΠΠΎΠ½Π΅ΡΠΊΠΈΠΌ. ΠΠ΄Π½Π°ΠΊΠΎ Π²ΠΏΠ»ΠΎΡΡ Π΄ΠΎ Π°Π²Π³ΡΡΡΠ° 1956 Π³. Π.Π. ΠΠ°Π»Π°Π½ΠΊΠΈΠ½ ΠΈ Π΅Π³ΠΎ ΠΊΠΎΠ»Π»Π΅Π³ΠΈ ΠΎΠ±ΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎ Π½Π΅ Π±ΡΠ»ΠΈ Π³ΠΎΡΠΎΠ²Ρ Π²Π½Π΅Π΄ΡΠΈΡΡ ΠΊΠ°Π²ΠΎΠΏΡΠ»ΡΠΌΠΎΠ½Π°Π»ΡΠ½ΡΠΉ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ· Π² ΠΊΠ»ΠΈΠ½ΠΈΠΊΡ. ΠΠ΅ΡΠ²ΡΠΉ ΡΡΠΏΠ΅ΡΠ½ΡΠΉ ΠΊΠ°Π²ΠΎΠΏΡΠ»ΡΠΌΠΎΠ½Π°Π»ΡΠ½ΡΠΉ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ· Π² Π‘Π¨Π 25 ΡΠ΅Π²ΡΠ°Π»Ρ 1958 Π³. Π²ΡΠΏΠΎΠ»Π½ΠΈΠ» Π. ΠΠ»Π΅Π½Π½. ΠΠΏΡΡ Π°Π²ΡΠΎΡΠ°, Π΅Π³ΠΎ Π°Π²ΡΠΎΡΠΈΡΠ΅Ρ ΠΈ ΠΏΡΠ±Π»ΠΈΠΊΠ°ΡΠΈΡ Π² ΠΏΡΠ΅ΡΡΠΈΠΆΠ½ΠΎΠΌ ΠΆΡΡΠ½Π°Π»Π΅ ΠΏΡΠΈΠ²Π΅Π»ΠΈ ΠΊ ΡΠΎΠΌΡ, ΡΡΠΎ ΠΊΠ°Π²ΠΎΠΏΡΠ»ΡΠΌΠΎΠ½Π°Π»ΡΠ½ΡΠΉ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ· Π² Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΠ΅ Π½Π°Π·ΡΠ²Π°ΡΡ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ΅ΠΉ ΠΠ»Π΅Π½Π½Π° (Glenn procedure). Π‘ΡΠΈΡΠ°Π΅ΠΌ, ΠΎΠ΄Π½Π°ΠΊΠΎ, ΡΡΠΎ ΠΏΡΠ°Π²ΠΈΠ»ΡΠ½Π΅Π΅ Π΅Π³ΠΎ Π½Π°Π·ΡΠ²Π°ΡΡ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ΅ΠΉ ΠΠ°ΠΊΡΠ»Π΅Π²Π° β ΠΠ΅ΡΠ°Π»ΠΊΠΈΠ½Π° ΠΈΠ»ΠΈ ΠΏΡΠΎΡΡΠΎ ΡΡΡΡΠΊΠΈΠΌ Π°Π½Π°ΡΡΠΎΠΌΠΎΠ·ΠΎΠΌ.ΠΠΎΡΡΡΠΏΠΈΠ»Π° Π² ΡΠ΅Π΄Π°ΠΊΡΠΈΡ 17 ΠΈΡΠ»Ρ 2017 Π³. ΠΡΠΈΠ½ΡΡΠ° ΠΊ ΠΏΠ΅ΡΠ°ΡΠΈ 13 Π°Π²Π³ΡΡΡΠ° 2017 Π³.Π€ΠΈΠ½Π°Π½ΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π½Π΅ ΠΈΠΌΠ΅Π»ΠΎ ΡΠΏΠΎΠ½ΡΠΎΡΡΠΊΠΎΠΉ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠΊΠΈ.ΠΠΎΠ½ΡΠ»ΠΈΠΊΡ ΠΈΠ½ΡΠ΅ΡΠ΅ΡΠΎΠ²ΠΠ²ΡΠΎΡΡ Π·Π°ΡΠ²Π»ΡΡΡ ΠΎΠ± ΠΎΡΡΡΡΡΡΠ²ΠΈΠΈ ΠΊΠΎΠ½ΡΠ»ΠΈΠΊΡΠ° ΠΈΠ½ΡΠ΅ΡΠ΅ΡΠΎΠ².ΠΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½Π°Ρ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΡΠΠΎΠ»Π½ΡΠΉ Π°Π½Π³Π»ΠΎΡΠ·ΡΡΠ½ΡΠΉ ΡΠ΅ΠΊΡΡ ΡΡΠ°ΡΡΠΈ ΠΈ ΡΠΏΠΈΡΠΎΠΊ Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΡ Π½Π° Π»Π°ΡΠΈΠ½ΠΈΡΠ΅ Π΄ΠΎΡΡΡΠΏΠ½Ρ Π² ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ Π²Π΅ΡΡΠΈΠΈ Π½Π° ΡΠ°ΠΉΡΠ΅ ΠΆΡΡΠ½Π°Π»Π°: http://journalmeshalkin.ru/index.php/heartjournal/article/view/493</p
Design criteria and validation of a vacuum load current multiplier on a mega-ampere microsecond inductive storage generator
International audienceThe load current multiplier concept (LCM) was suggested for improving the energy transfer efficiency from pulse power generators to loads. The concept was initially demonstrated at atmospheric pressure and dielectric insulation on a compact, 100 kA, microsecond capacitor bank. This paper reports on the LCM design criteria for mega-ampere vacuum pulse power when the LCM comprises a large-inductance magnetic flux extruder cavity without a magnetic core. The analytical and numerical design approach presented was experimentally validated on GIT12 mega-ampere inductive energy storage generator with a constant-inductance load. The LCM technique increased the peak load current from typically 4.6 MA at 1.87 Β΅s on this generator, to 6.43 MA at 2.0 Β΅s. The electromagnetic power into a ~10 nH load increased from 100 GW to 230 GW. This result is in good agreement with the presented numerical simulations and it corresponds to a 95% increase of the achievable magnetic pressure at 8 cm radius in the load. The compact, LCM hardware allows the GIT12 generator to operate more efficiently without modifying the stored energy or architecture. The demonstrated load power and energy increase using the LCM concept is of importance for further studies on power amplification in vacuum and high energy density physics