489 research outputs found
Β«The Ball LightningΒ»: Physics Base & Conceptual Views Complex
The complex of conceptual views about ball lightning (BL) as containing surplus electrical charge quasi-stationary material foundation with distinctions between levels of translation temperature and exciting temperatures of chemical bonds and electron energy states has been offered and is substantiated in the paper. The being formed complex is grounded upon overstepping the limits of generally accepted physical base and is aimed at all-round substantiation of jointly observed in nature manifestations ob BL. Within the limits of the being formed complex the possibility of localization of ball lightning in airspace is confirmed. The nature of the oneβs radiate capacity is substantiated. The role of environment as source that feeds BL with energy is established. Power supply mechanisms, conditions and peculiarities of BLβs characteristics reproduction through lifetime are specified. The formations channels of energy resources of BL are turned out. Levels of BLβs energy potentialities, both permissibility proper and wide diapason of variation of the ones (multi-faces of ball lightning) are substantiated. Adequacy of being formulated conceptual views as a whole is confirmed
Using a Bias Potential in a Constant and Pulse Modes for Structural Engineering Vacuum Arc Nanocrystalline Coatings of Zirconium Nitride
In order to develop the direction of "structural engineering nitride coatings" in the work conducted systematic analysis of the impact of the negative bias potential (direct and high-voltage pulse) on the structure, substructure and mechanical properties of ZrN coatings obtained by vacuum arc evaporation. Defined boundary value of (β 100 V) DC potential applied to the substrate, below which a high-voltage pulse potential (β 1200 ... β 2000 V quantity that allows to form peaks bias) makes a decisive contribution to the formation of preferred orientation of the crystallites with the [110] axis. The highest values of hardness 43 GPa are achieved at a constant potential -70 V. Supply high-voltage pulse shifts the maximum hardness in the direction of a greater value of the constant potential
Internal documentary control system of economic agents as a factor of business economic security
Considered and studied internal documentary control system of economic agents as a f actor of husiness economic security. Proposed a matrix of internal documentary collfrol system of economic agents. Lnvesting the basic standarts of documentary control to be used in the enterprise
Experimental Stand for Investigations of Insulator Degradation and Electrode Erosion in High-current Breaker
An experimental stand for studies of electric arc, electrode erosion and insulator degradation processes in high-current circuit breakers and some preliminary experimental data is described. The setup includes a discharge chamber, a capacitive energy storage with capacitance of 0.11βF, voltage up to 10βkV, and all necessary diagnostic techniques. The stand is designed for modeling current pulse with amplitude of 3β150βkA and duration of the first half period of 1.0β3.0 βms during the process of disconnecting the ring and the pin contacts. The arc is cooled by transverse gas blowing at pressure in the chamber of 0.5β3βMPa. Acquired experimental data can be used for verification of the modelling results of the heat transfer processes in the discharge chamber. At the stand, advanced composite materials based on carbon and iron-copper pseudoalloy are studied
Topological Dirac Semimetal Na3Bi Films in the Ultrathin Limit via Alternating Layer Molecular Beam Epitaxy
Ultrathin films of Na3Bi on insulating substrates are desired for opening a
bulk band gap and generating the quantum spin Hall effect from a topological
Dirac semimetal, though continuous films in the few nanometer regime have been
difficult to realize. Here, we utilize alternating layer molecular beam epitaxy
(MBE) to achieve uniform and continuous single crystal films of Na3Bi(0001) on
insulating Al2O3(0001) substrates and demonstrate electrical transport on films
with 3.8 nm thickness (4 unit cells). The high material quality is confirmed
through in situ reflection high-energy electron diffraction (RHEED), scanning
tunneling microscopy (STM), x-ray diffraction (XRD), and x-ray photoelectron
spectroscopy (XPS). In addition, these films are employed as seed layers for
subsequent growth by codeposition, leading to atomic layer-by-layer growth as
indicated by RHEED intensity oscillations. These material advances facilitate
the pursuit of quantum phenomena in thin films of Dirac semimetals.Comment: 11 pages, 5 figure
Fractal Graphs and their Properties
The idea of representing urban structure and various communication systems (water and energy supply, telephone and cable TV networks) as fractal objects is not absolutely new. However, known works, devoted to this problem use models and approaches from fractal physics. For example, to simulate urban growth Diffusion Limited Aggregation (DLA) model and Dielectric Breakdown (DB) model are used. This study introduces a different approach. Net structure of communication system is described by a graph of special type called regular G(l,r,n)-graph. Authors provide description of such graph, develop iterative process for its generation and prove its self-similarity, i.e. that every regular graph is a pre-fractal. After the infinite number of steps this process generates a fractal. The devised algorithm for generation and grathical representation of regular G(l,r,n)-graphs with different values of l,r and n has been programmed to receive computer simulations. For optimal graphic presentation of pre-fractals the Optimal Space Ordering method was suggested. It is based on the minimization of the >graph energygraph energy< is directly related to the graph's fractal properties. For G(3,3,n) and G(4,4,n) graphs fractal dimensions calculated by different methods are the same (D=1,5 and D=2 respectively), while topological dimension of both graphs is 1
Pharmacological blockade of cannabinoid type II receptors and mesenchymal stem cell transplantation in a model of peripheral neuropathic pain
Objective. To evaluate the anti-nociceptive and reparative effects of adipose-derived mesenchymal stem cells (ADMSCs) under the pharmacological blockade of cannabinoid CB2 receptors in a model of peripheral neuropathic pain.Material and methods. In 40 male Wistar rats, modeling of peripheral neuropathy (NP) was performed by excising a sciatic nerve. On day 7 of the study, ADMSCs (1 Γ 106 cells/kg) were transplanted into the area of sciatic nerve injury without additional influences or after administration of the CB2 receptor antagonist AM630, as well as after incubation with AM630. Within 90 Β days, nociceptive sensitivity was studied, as well as a detailed analysis of gait using CatWalk XT (Noldus, Netherlands). On day 21 and day 90, histostructure of the distal segment of the sciatic nerve was assessed.Results. Pharmacological blockade of CB2 receptors both on the ADMSCs and in the soft tissues surrounding the site of sciatic nerve injury led to a decrease in withdrawal threshold and withdrawal latency from day 28 of the study compared with the group of rats with NP and transplantation of ADMSCs only. Local injection of AM630 before transplantation of ADMSCs contributed to the development of Β NP-induced gait disturbances and increase of the number of damaged nerve fibers in the distal segment of sciatic nerve. Transplantation of ADMSCs pretreated with Β AM630 did not significantly affect the rate of recovery of gait parameters, and decreased the number of damaged nerve fibers by day 90 of study.Conclusion. Blockade of CB2 receptors, both on the membranes of MSCs and in the area of damage to the peripheral nerve, has a negative effect on the development of the anti-nociceptive and reparative effects of MSCs
ΠΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡ ΠΈΠΌΠΌΡΠ½ΠΎΡΡΠΏΡΠ΅ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΏΡΠΈ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΡΡΠ΅ΡΡΠ΅ΠΉ ΠΏΠ΅ΡΠ΅ΡΠ°Π΄ΠΊΠΈ ΠΏΠΎΡΠΊΠΈ Π² ΡΠ°Π½Π½Π΅ΠΌ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄Π΅. ΠΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅
The choice of immunosuppressive therapy is determined by the degree of sensitization to the histocompatibilityΒ gene complex on chromosome 6 (HLA). The risk of rejection in the early periods after surgeryΒ increases for the patients with repeated kidney transplantation. Optimizing immunosuppressive therapy is the onlyΒ way to prolong theΒ life of a patient with a terminal stage of chronic renal failure. ΠΈΠΌΠΎΡΡΠΈ Π½Π° 6-ΠΉ Ρ
ΡΠΎΠΌΠΎΡΠΎΠΌΠ΅ (ΠLA). The analysis of aΒ clinical case of a 47-year-old patient who was undergoing treatment at the N.V. Sklifosovsky Scientific ResearchΒ Institute of Emergency Medicine after the third allotransplantation of a cadaveric kidney in 2016 was performed.Β The patient was diagnosed with chronic glomerulonephritis (IgA-nephropathy) chronic end-stage renal failure; inΒ the early postoperative period, in addition to basic immunosuppression, anti-lymphocytic polyclonal antibodiesΒ were prescribed in combination with plasmapheresis sessions for the treatment and prevention of acute rejectionΒ crisis in the early postoperative period. For the first time, in order to prevent the development of an acute rejectionΒ crisis and minimize infectious complications of immunosuppressive therapy in the recipient after the third kidneyΒ transplant, plasmapheresis sessions were used using a plasmapheresis filter with a polymethylacrylate membrane inΒ combination with a short course of polyclonal antibodies.ΠΡΠ±ΠΎΡ ΠΈΠΌΠΌΡΠ½ΠΎΡΡΠΏΡΠ΅ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ ΡΡΠ΅ΠΏΠ΅Π½ΡΡ ΡΠ΅Π½ΡΠΈΠ±ΠΈΠ»ΠΈΠ·Π°ΡΠΈΠΈ ΠΊΒ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡ Π³Π΅Π½ΠΎΠ² Π³ΠΈΡΡΠΎΡΠΎΠ²ΠΌΠ΅ΡΡΠΈΠΌΠΎΡΡΠΈ Π½Π° 6-ΠΉ Ρ
ΡΠΎΠΌΠΎΡΠΎΠΌΠ΅ (ΠLA). Π£ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΠΏΡΠΈ ΠΏΠΎΠ²ΡΠΎΡΠ½ΠΎΠΉΒ ΠΏΠ΅ΡΠ΅ΡΠ°Π΄ΠΊΠ΅ ΠΏΠΎΡΠΊΠΈ ΡΠΈΡΠΊ ΠΎΡΡΠΎΡΠΆΠ΅Π½ΠΈΡ Π²Β ΡΠ°Π½Π½ΠΈΠ΅ ΡΡΠΎΠΊΠΈ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΡΠ²Π΅Π»ΠΈΡΠΈΠ²Π°Π΅ΡΡΡ. ΠΠΏΡΠΈΠΌΠΈΠ·Π°ΡΠΈΡ ΠΈΠΌΠΌΡΠ½ΠΎΡΡΠΏΡΠ΅ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ β Π΅Π΄ΠΈΠ½ΡΡΠ²Π΅Π½Π½ΡΠΉΒ ΠΏΡΡΡ ΠΏΡΠΎΠ΄Π»Π΅Π½ΠΈΡ ΠΆΠΈΠ·Π½ΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ° Ρ Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΠΎΡΠ΅ΡΠ½ΠΎΠΉ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎΡΡΡΡ Π² ΡΠ΅ΡΠΌΠΈΠ½Π°Π»ΡΠ½ΠΎΠΉ ΡΡΠ°Π΄ΠΈΠΈ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ·Β ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ»ΡΡΠ°Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ° 47 Π»Π΅Ρ ΠΏΠΎΡΠ»Π΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΡΡΠ΅ΡΡΠ΅ΠΉ Π°Π»Π»ΠΎΡΡΠ°Π½ΡΠΏΠ»Π°Π½ΡΠ°ΡΠΈΠΈΒ ΡΡΡΠΏΠ½ΠΎΠΉΒ ΠΏΠΎΡΠΊΠΈ Π² 2016 Π³., Π½Π°Ρ
ΠΎΠ΄ΠΈΠ²ΡΠ΅Π³ΠΎΡΡ Π½Π° Π»Π΅ΡΠ΅Π½ΠΈΠΈ Π² ΠΠΠ Π‘Π ΠΈΠΌ. Π.Π. Π‘ΠΊΠ»ΠΈΡΠΎΡΠΎΠ²ΡΠΊΠΎΠ³ΠΎ Ρ Π΄ΠΈΠ°Π³Π½ΠΎΠ·ΠΎΠΌ Β«Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΉΒ Π³Π»ΠΎΠΌΠ΅ΡΡΠ»ΠΎΠ½Π΅ΡΡΠΈΡ (IgA-Π½Π΅ΡΡΠΎΠΏΠ°ΡΠΈΡ), Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΏΠΎΡΠ΅ΡΠ½Π°Ρ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎΡΡΡ, ΡΠ΅ΡΠΌΠΈΠ½Π°Π»ΡΠ½Π°Ρ ΡΡΠ°Π΄ΠΈΡΒ». Π ΡΠ°Π½Π½Π΅ΠΌ ΠΏΠΎΡΠ»Π΅ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΌ ΠΏΠ΅ΡΠΈΠΎΠ΄Π΅ ΠΏΠΎΠΌΠΈΠΌΠΎΒ Π±Π°Π·ΠΎΠ²ΠΎΠΉ ΠΈΠΌΠΌΡΠ½ΠΎΡΡΠΏΡΠ΅ΡΡΠΈΠΈ Π±ΡΠ»ΠΈ Π½Π°Π·Π½Π°ΡΠ΅Π½Ρ Π°Π½ΡΠΈΠ»ΠΈΠΌΡΠΎΡΠΈΡΠ°ΡΠ½ΡΠ΅Β ΠΏΠΎΠ»ΠΈΠΊΠ»ΠΎΠ½Π°Π»ΡΠ½ΡΠ΅ Π°Π½ΡΠΈΡΠ΅Π»Π° Π² ΡΠΎΡΠ΅ΡΠ°Π½ΠΈΠΈ Ρ ΡΠ΅Π°Π½ΡΠ°ΠΌΠΈ ΠΏΠ»Π°Π·ΠΌΠ°ΡΠ΅ΡΠ΅Π·Π° Π΄Π»Ρ Π»Π΅ΡΠ΅Π½ΠΈΡ ΠΈ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΠΎΡΡΡΠΎΠ³ΠΎ ΠΊΡΠΈΠ·Π°Β ΠΎΡΡΠΎΡΠΆΠ΅Π½ΠΈΡ Π² ΡΠ°Π½Π½ΠΈΠ΅ ΡΡΠΎΠΊΠΈ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ.ΠΠΏΠ΅ΡΠ²ΡΠ΅ Ρ ΡΠ΅Π»ΡΡ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠΈ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΎΡΡΡΠΎΠ³ΠΎ ΠΊΡΠΈΠ·Π° ΠΎΡΡΠΎΡΠΆΠ΅Π½ΠΈΡ, ΠΌΠΈΠ½ΠΈΠΌΠΈΠ·Π°ΡΠΈΠΈΒ ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ ΠΈΠΌΠΌΡΠ½ΠΎΡΡΠΏΡΠ΅ΡΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ Ρ ΡΠ΅ΡΠΈΠΏΠΈΠ΅Π½ΡΠ° ΠΏΠΎΡΠ»Π΅ ΡΡΠ΅ΡΡΠ΅ΠΉΒ ΠΏΠ΅ΡΠ΅ΡΠ°Π΄ΠΊΠΈ ΠΏΠΎΡΠΊΠΈ Π±ΡΠ»ΠΈ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½Ρ ΡΠ΅Π°Π½ΡΡΒ ΠΏΠ»Π°Π·ΠΌΠ°ΡΠ΅ΡΠ΅Π·Π° Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΏΠ»Π°Π·ΠΌΠΎΡΠΈΠ»ΡΡΡΠ° Ρ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠΎΠΊΡΠΈΠ»Π°ΡΠ½ΠΎΠΉ ΠΌΠ΅ΠΌΠ±ΡΠ°Π½ΠΎΠΉ Π² ΡΠΎΡΠ΅ΡΠ°Π½ΠΈΠΈ Ρ ΠΊΠΎΡΠΎΡΠΊΠΈΠΌΒ ΠΊΡΡΡΠΎΠΌ ΠΏΠΎΠ»ΠΈΠΊΠ»ΠΎΠ½Π°Π»ΡΠ½ΡΡ
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