1,397 research outputs found
ΠΠ°Π·Π²Π°Π½ΠΈΠ΅ ΡΡΠ°ΡΡΠΈ: ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ Π²ΡΠ±ΡΠΎΡΠΎΠ² ΠΏΠ°ΡΠ½ΠΈΠΊΠΎΠ²ΡΡ Π³Π°Π·ΠΎΠ² ΡΠ΅ΡΠ΅Π· ΡΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΠΎΡΡ ΠΎΠ΄Π°ΠΌΠΈ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π°
Π Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ Π½Π°ΡΠ΅Π»Π΅Π½ΠΈΠ΅ ΠΌΠΈΡΠ° ΡΠ°ΡΡΠ΅Ρ ΠΎΡΠ΅Π½Ρ Π±ΡΡΡΡΠΎ. Π’Π°ΠΊΠΎΠΉ ΡΠΎΡΡ Π½Π°ΡΠ΅Π»Π΅Π½ΠΈΡΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΠ΅Ρ Π²ΡΡΠΎΠΊΠΎΠΌΡ Π·Π°Π³ΡΡΠ·Π½Π΅Π½ΠΈΡ ΠΎΠΊΡΡΠΆΠ°ΡΡΠ΅ΠΉ ΡΡΠ΅Π΄Ρ. Π‘ΠΆΠΈΠ³Π°Π½ΠΈΠ΅ ΡΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠΎΠΏΠ»ΠΈΠ²Π°Π½Π΅ΠΈΠ·Π±Π΅ΠΆΠ½ΠΎ Π²Π΅Π΄Π΅Ρ ΠΊ Π½Π°ΠΊΠΎΠΏΠ»Π΅Π½ΠΈΡ Π² Π°ΡΠΌΠΎΡΡΠ΅ΡΠ΅ ΡΠ³Π»Π΅ΠΊΠΈΡΠ»ΠΎΠ³ΠΎ Π³Π°Π·Π° ΠΈ ΡΡΠΈΠ»Π΅Π½ΠΈΡ ΠΏΠ°ΡΠ½ΠΈΠΊΠΎΠ²ΠΎΠ³ΠΎ ΡΡΡΠ΅ΠΊΡΠ°.Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π·Π°ΠΊΠ»ΡΡΠ°Π»Π°ΡΡ Π² ΠΎΡΠ΅Π½ΠΊΠ΅ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π² ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π΅Π½Π½ΠΎΠΌ ΡΠΈΠΊΠ»Π΅Π²ΡΠΎΡΠΈΡΠ½ΠΎΠΉ ΠΏΠ΅ΡΠ΅ΡΠ°Π±ΠΎΡΠΊΠΈ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Π½ΡΡ
ΠΠΠ’ Π±ΡΡΡΠ»ΠΎΠΊ ΠΊΠ°ΠΊ Π²Π°ΡΠΈΠ°Π½ΡΠ° ΡΡΠΈΠ»ΠΈΠ·Π°ΡΠΈΠΈ ΠΎΡΡ
ΠΎΠ΄ΠΎΠ², ΠΊΠΎΡΠΎΡΡΠΉΠΌΠΎΠΆΠ΅Ρ ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΡΠΌΠ΅Π½ΡΡΠΈΡΡ ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ, ΡΠ²ΡΠ·Π°Π½Π½ΡΠ΅ Ρ ΠΎΡΡ
ΠΎΠ΄Π°ΠΌΠΈ ΠΏΠ»Π°ΡΡΠΈΠΊΠΎΠ²ΡΡ
Π±ΡΡΡΠ»ΠΎΠΊ.ΠΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΠΏΠ°ΡΠ½ΠΈΠΊΠΎΠ²ΡΡ
Π³Π°Π·ΠΎΠ² ΠΌΠΎΠΆΠ΅Ρ Π±ΡΡΡ ΡΠΎΠΊΡΠ°ΡΠ΅Π½ΠΎ Π·Π° ΡΡΠ΅Ρ ΠΎΡΠΊΠ°Π·Π° ΠΎΡ Π·Π°Ρ
ΠΎΡΠΎΠ½Π΅Π½ΠΈΡ ΠΈ ΡΠΆΠΈΠ³Π°Π½ΠΈΡ Π²ΠΏΠΎΠ»ΡΠ·Ρ ΠΏΠ΅ΡΠ΅ΡΠ°Π±ΠΎΡΠΊΠΈ. ΠΠ΅ΡΠ΅ΡΠ°Π±ΠΎΡΠΊΠ° ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠΊΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈ Π±ΠΎΠ»Π΅Π΅ ΠΏΡΠ΅Π΄ΠΏΠΎΡΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ Π΄Π»Ρ ΡΡΠΈΠ»ΠΈΠ·Π°ΡΠΈΠΈ ΠΠΠ’ ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ²
The emission of energetic electrons from the complex streamer corona adjacent to leader stepping
We here propose a model to capture the complexity of the streamer corona
adjacent to leader stepping and relate it to the production of energetic
electrons serving as a source of X-rays and -rays, manifesting in
terrestrial gamma-ray flashes (TGFs). During its stepping, the leader tip is
accompanied by a corona consisting of multitudinous streamers perturbing the
air in its vicinity and leaving residual charge behind. We explore the relative
importance of air perturbations and preionization on the production of
energetic run-away electrons by 2.5D cylindrical Monte Carlo particle
simulations of streamers in ambient fields of 16 kV cm and 50 kV
cm at ground pressure. We explore preionization levels between
m and m, channel widths between 0.5 and 1.5 times the
original streamer widths and air perturbation levels between 0\% and 50\% of
ambient air. We observe that streamers in preionized and perturbed air
accelerate more efficiently than in non-ionized and uniform air with air
perturbation dominating the streamer acceleration. We find that in unperturbed
air preionization levels of m are sufficient to explain
run-away electron rates measured in conjunction with terrestrial gamma-ray
flashes. In perturbed air, the production rate of runaway electrons varies from
s to s with maximum electron energies from
some hundreds of eV up to some hundreds of keV in fields above and below the
breakdown strength. In the presented simulations the number of runaway
electrons matches with the number of energetic electrons measured in alignment
with the observations of terrestrial gamma-ray flashes. Conclusively, the
complexity of the streamer zone ahead of leader tips allows explaining the
emission of energetic electrons and photons from streamer discharges.Comment: 29 pages, 11 figures, 2 table
Methods of noninvasive electrophysiological heart examination basing on solution of inverse problem of electrocardiography
The article represents the main noninvasive methods of heart electrical activity examination, theoretical bases of solution of electrocardiography inverse problem, application of different methods of heart examination in clinical practice, and generalized achievements in this sphere in global experience
Integrative Modeling of Electrical Properties of Pacemaker Cardiac Cells
This work represents modeling of electrical properties of pacemaker (sinus) cardiac cells. Special attention is paid to electrical potential arising from transmembrane current of Na{+}, K{+} and Ca{2+} ions. This potential is calculated using the NaCaX model. In this respect, molar concentration of ions in the intercellular space which is calculated on the basis of the GENTEX model is essential. Combined use of two different models allows referring this approach to integrative modeling
Impact of filtration elements on bioelectrical signal
Filtering of the wanted signal from the noise caused by power lines, magnetic pickup, interference from body movement, etc. in the field of medical data processing is a weighty problem of cardiography. To date, different types of digital filters have been used to clear the signal from unnecessary frequency bands. This paper presents the results of the filter simulation in MATLAB package
Permanent Stability Bracing of CFS Trusses
Permanent stability bracing of Cold-Formed Steel (CFS) roof/floor trusses is needed for the three major planes in a truss: Top chord, Bottom Chord and Web. Primary function of bracing is to prevent lateral instability of members as well as stiffen the overall roof/floor system. Brace force is dependent on the magnitude of applied loads and the level of out-of-planeness permitted. Traditionally, 2% of the axial compression force in a member is used as the brace (restraint) force, which is based on an out-of-plane deflection of L/200 where L is the member length. Continuous Lateral Restraint (CLR) forces are accumulated from similar members in several adjacent trusses and then transferred through Diagonal Braces (DB) to the bearings or other shear resisting elements (for example, metal decking). For chord and web members, a method to determine the forces in CLR and DB is presented using a statics based approach with varying number of braces and mode shapes for a maximum permitted out-of-planeness of L/200. For the chord members with more than two CLR\u27s, a method for designing a Brace Collector Frame (BCF) based on the Net Lateral Restraining Force (NLRF) is presented
Visualization of the heart with help of cardiographic equipment
This study presents the problems associated with cardiovascular diseases (CVD) and Twocomponent FitzHugh - Nagumo model and heart condition imaging algorithm are considered. Aspects of work aimed at designing and developing of the hardware and software complex based on the information obtained with the help of an electrocardiograph
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