177 research outputs found
It support in decision-making with regard to infra-red grain drying management
The work is devoted to information support of grain infrared drying, on the basis of a rational choice of the
process temperature and computer control. The model is developed and the original system of differential
equations for double and single inlet of heat from the infrared source. Implemented into software a system
of information support of infrared drying grain, with user-friendly interface, intuitive control components, as
well as the presentation of the forecast and the resulting information. Experimental studies of the influence
of various parameters of the information support system for infrared grain drying on heat exchange and
evaporation of moisture in a drying chamber were performed. The evaluation of various options for using the
module of information support systems for infrared grain drying was carried ou
Comparative study of hydrotalcite-derived supported Pd<sub>2</sub>Ga and PdZn intermetallic nanoparticles as methanol synthesis and methanol steam reforming catalysts
An effective and versatile synthetic approach to produce well-dispersed supported intermetallic nanoparticles is presented that allows a comparative study of the catalytic properties of different intermetallic phases while minimizing the influence of differences in preparation history. Supported PdZn, Pd2Ga, and Pd catalysts were synthesized by reductive decomposition of ternary Hydrotalcite-like compounds obtained by co-precipitation from aqueous solutions. The precursors and resulting catalysts were characterized by HRTEM, XRD, XAS, and CO-IR spectroscopy. The Pd2+ cations were found to be at least partially incorporated into the cationic slabs of the precursor. Full incorporation was confirmed for the PdZnAl-Hydrotalcite-like precursor. After reduction of Ga- and Zn-containing precursors, the intermetallic compounds Pd2Ga and PdZn were present in the form of nanoparticles with an average diameter of 6 nm or less. Tests of catalytic performance in methanol steam reforming and methanol synthesis from CO2 have shown that the presence of Zn and Ga improves the selectivity to CO2 and methanol, respectively. The catalysts containing intermetallic compounds were 100 and 200 times, respectively, more active for methanol synthesis than the monometallic Pd catalyst. The beneficial effect of Ga in the active phase was found to be more pronounced in methanol synthesis compared with steam reforming of methanol, which is likely related to insufficient stability of the reduced Ga species in the more oxidizing feed of the latter reaction. Although the intermetallic catalysts were in general less active than a Cu-/ZnO-based material prepared by a similar procedure, the marked changes in Pd reactivity upon formation of intermetallic compounds and to study the tunability of Pd-based catalysts for different reactions
Electron transport through a mesoscopic metal-CDW-metal junction
In this work we study the transport properties of a finite Peierls-Fr\"ohlich
dielectric with a charge density wave of the commensurate type. We show that at
low temperatures this problem can be mapped onto a problem of fractional charge
transport through a finite-length correlated dielectric, recently studied by
Ponomarenko and Nagaosa [Phys. Rev. Lett {\bf 81}, 2304 (1998)]. The
temperature dependence of conductance of the charge density wave junction is
presented for a wide range of temperatures.Comment: Latex, Revtex 3.0, 7 pages, 2 EPS figures (uses epfs
Electrochemical synthesis of peroxomonophosphate using boron-doped diamond anodes
A new method for the synthesis of peroxomonophosphate, based on the use of boron-doped diamond electrodes, is described. The amount of oxidant electrogenerated depends on the characteristics of the supporting media (pH and solute concentration) and on the operating conditions (temperature and current density). Results show that the pH, between values of 1 and 5, does not influence either the electrosynthesis of peroxomonophosphate or the chemical stability of the oxidant generated. Conversely, low temperatures are required during the electrosynthesis process to minimize the thermal decomposition of peroxomonophosphate and to guarantee significant oxidant concentration. In addition, a marked influence of both the current density and the initial substrate is observed. This observation can be explained in terms of the contribution of hydroxyl radicals in the oxidation mechanisms that occur on diamond surfaces. In the assays carried out below the water oxidation potential, the generation of hydroxyl radicals did not take place. In these cases, peroxomonophosphate generation occurs through a direct electron transfer and, therefore, at these low current densities lower concentrations are obtained. On the other hand, at higher potentials both direct and hydroxyl radical-mediated mechanisms contribute to the oxidant generation and the process is more efficient. In the same way, the contribution of hydroxyl radicals may also help to explain the significant influence of the substrate concentration. Thus, the coexistence of both phosphate and hydroxyl radicals is required to ensure the generation of significant amounts of peroxomonophosphoric acid
ΠΠ΅Π΄ΠΈΠ°ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π°ΡΡΠΎΠΈΠΌΠΌΡΠ½Π½ΠΎΠ΅ Π½Π΅ΠΉΡΠΎΠΏΡΠΈΡ ΠΈΠ°ΡΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΡΠ°ΡΡΡΡΠΎΠΉΡΡΠ²ΠΎ, Π°ΡΡΠΎΡΠΈΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ΅ ΡΠΎ ΡΡΡΠ΅ΠΏΡΠΎΠΊΠΎΠΊΠΊΠΎΠ²ΠΎΠΉ ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠ΅ΠΉ (PANDAS-ΡΠΈΠ½Π΄ΡΠΎΠΌ): ΠΌΠΈΡΠΎΠ²Π°Ρ ΠΏΡΠ°ΠΊΡΠΈΠΊΠ° ΠΈ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅
Group A beta-hemolytic streptococcus is one of the most important infectious agents leading to both direct damage to organs, and to various cross-reactions with body antigens. One of these forms, manifested by the defeat of subcortical ganglia, is PANDAS syndrome. This paper describes the international criteria and clarifies the differences between this disorder and other forms of brain damage. Paper also describes the clinical case of PANDAS syndrome in a 7-year-old child.ΠΠ΅ΡΠ°-Π³Π΅ΠΌΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΡΡΠ΅ΠΏΡΠΎΠΊΠΎΠΊΠΊ Π³ΡΡΠΏΠΏΡ Π ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· Π²Π°ΠΆΠ½ΡΡ
ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΎΠ½Π½ΡΡ
Π°Π³Π΅Π½ΡΠΎΠ², ΠΏΡΠΈΠ²ΠΎΠ΄ΡΡΠΈΡ
ΠΊΠ°ΠΊ ΠΊ Π½Π΅ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²Π΅Π½Π½ΠΎΠΌΡ ΠΏΠΎΠ²ΡΠ΅ΠΆΠ΄Π΅Π½ΠΈΡ ΠΎΡΠ³Π°Π½ΠΎΠ² ΠΈ ΡΠΊΠ°Π½Π΅ΠΉ, ΡΠ°ΠΊ ΠΈ ΠΊ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠΌ ΠΏΠ΅ΡΠ΅ΠΊΡΠ΅ΡΡΠ½ΡΠΌ ΡΠ΅Π°ΠΊΡΠΈΡΠΌ Ρ Π°Π½ΡΠΈΠ³Π΅Π½Π°ΠΌΠΈ ΠΎΡΠ³Π°Π½ΠΈΠ·ΠΌΠ°. ΠΠ΄Π½ΠΎΠΉ ΠΈΠ· ΡΠ°ΠΊΠΈΡ
Π½ΠΎΠ·ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΎΡΠΌ, ΠΏΡΠΎΡΠ²Π»ΡΡΡΠΈΡ
ΡΡ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠΎΠ΄ΠΊΠΎΡΠΊΠΎΠ²ΡΡ
Π³Π°Π½Π³Π»ΠΈΠ΅Π², ΡΠ²Π»ΡΠ΅ΡΡΡ ΡΠΈΠ½Π΄ΡΠΎΠΌ PANDAS. Π Π΄Π°Π½Π½ΠΎΠΉ ΡΡΠ°ΡΡΠ΅ ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΠΊΡΠΈΡΠ΅ΡΠΈΠΈ, ΡΡΠΎΡΠ½Π΅Π½Ρ ΠΎΡΠ»ΠΈΡΠΈΡ Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΡΠ°ΡΡΡΡΠΎΠΉΡΡΠ²Π° ΠΎΡ Π΄ΡΡΠ³ΠΈΡ
ΡΠΎΡΠΌ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΡ Π³ΠΎΠ»ΠΎΠ²Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ·Π³Π°, ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠ»ΡΡΠ°ΠΉ PANDAS ΡΠΈΠ½Π΄ΡΠΎΠΌΠ° Ρ ΡΠ΅Π±Π΅Π½ΠΊΠ° 7 Π»Π΅Ρ
Orientation-controlled, low-temperature plasma growth and applications of h-BN nanosheets
Dimensionality and orientation of hexagonal boron nitride (h-BN) nanosheets are promising to create and control their unique properties for diverse applications. However, low-temperature deposition of vertically oriented h-BN nanosheets is a significant challenge. Here we report on the low-temperature plasma synthesis of maze-like h-BN nanowalls (BNNWs) from a mixture of triethylamine borane (TEAB) and ammonia at temperatures as low as 400 Β°C. The maze-like BNNWs contained vertically aligned stacks of h-BN nanosheets. Wavy h-BN nanowalls with randomly oriented nanocrystalline structure are also fabricated. Simple and effective control of morphological type of BNNWs by the deposition temperature is demonstrated. Despite the lower synthesis temperature, thermal stability and oxidation resistivity of the maze-like BNNWs are higher than for the wavy nanowalls. The structure and oxidation of the nanowalls was found to be the critical factor for their thermal stability and controlled luminescence properties. Cytotoxic study demonstrated significant antibacterial effect of both maze-like and wavy h-BN nanowalls against E. coli. The reported results reveal a significant potential of h-BN nanowalls for a broad range of applications from electronics to biomedicine. [Figure not available: see fulltext.]. Β© 2018, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
ΠΡΡΡΡΠ΅ ΠΈ Ρ ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π΄ΠΈΠ·ΠΈΠΌΠΌΡΠ½Π½ΡΠ΅ ΠΏΠΎΠ»ΠΈΠ½Π΅Π²ΡΠΎΠΏΠ°ΡΠΈΠΈ Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ ΠΏΠ°Π½Π΄Π΅ΠΌΠΈΠΈ COVID-19: ΠΏΠ°ΡΠΎΠ³Π΅Π½Π΅Π·, ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠ°ΡΡΠΈΠ½Ρ, Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΈ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ (ΠΎΠ±Π·ΠΎΡ Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΡ)
Dysimmune polyneuropathies are the etiologically heterogeneous group of diseases with autoimmune damage to the peripheral nervous system. The rarity of these diseases doesnβt exclude the possibility of their development or exacerbation in patients infected with SARSβCoVβ2, which will require timely differential diagnosis and urgent specific therapy. The article summarizes current information on the mechanisms of development, clinical features, diagnosis and management of acute and chronic dysimmune polyneuropathies in the context of the COVIDβ19 pandemic.ΠΠΈΠ·ΠΈΠΌΠΌΡΠ½Π½ΡΠ΅ ΠΏΠΎΠ»ΠΈΠ½Π΅Π²ΡΠΎΠΏΠ°ΡΠΈΠΈ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΡΡ ΡΠΎΠ±ΠΎΠΉ ΡΡΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈ Π³Π΅ΡΠ΅ΡΠΎΠ³Π΅Π½Π½ΡΡ Π³ΡΡΠΏΠΏΡ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ Ρ Π°ΡΡΠΎΠΈΠΌΠΌΡΠ½Π½ΡΠΌ ΠΏΠΎΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠ΅ΡΠΈΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π΅ΡΠ²Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ. Π Π΅Π΄ΠΊΠΎΡΡΡ Π΄Π°Π½Π½ΡΡ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΠΉ Π½Π΅ ΠΈΡΠΊΠ»ΡΡΠ°Π΅Ρ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ ΠΈΡ
ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΈΠ»ΠΈ ΠΎΠ±ΠΎΡΡΡΠ΅Π½ΠΈΡ Ρ ΠΈΠ½ΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
SARSβCoVβ2 ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ², ΡΡΠΎ, Π² ΡΠ²ΠΎΡ ΠΎΡΠ΅ΡΠ΅Π΄Ρ, ΠΏΠΎΡΡΠ΅Π±ΡΠ΅Ρ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΡΠ²ΠΎΠ΅Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ Π΄ΠΈΡΡΠ΅ΡΠ΅Π½ΡΠΈΠ°Π»ΡΠ½ΠΎΠΉ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΈ Π½Π΅ΠΎΡΠ»ΠΎΠΆΠ½ΠΎΠΉ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠΉ ΠΈ ΡΠΏΠ΅ΡΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ. Π ΡΡΠ°ΡΡΠ΅ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½Ρ Π°ΠΊΡΡΠ°Π»ΡΠ½ΡΠ΅ Π½Π° Π΄Π°Π½Π½ΡΠΉ ΠΌΠΎΠΌΠ΅Π½Ρ ΡΠ²Π΅Π΄Π΅Π½ΠΈΡ, ΠΊΠ°ΡΠ°ΡΡΠΈΠ΅ΡΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠΎΠ² ΡΠ°Π·Π²ΠΈΡΠΈΡ, ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠ°ΡΡΠΈΠ½Ρ, Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠΈ ΠΈ ΡΠ°ΠΊΡΠΈΠΊΠΈ Π²Π΅Π΄Π΅Π½ΠΈΡ ΠΎΡΡΡΡΡ
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ΠΏΠΎΠ»ΠΈΠ½Π΅Π²ΡΠΎΠΏΠ°ΡΠΈΠΉ Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΏΠ°Π½Π΄Π΅ΠΌΠΈΠΈ COVIDβ19
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