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Cooling of Granules in Vibrating, Suspended Bed: engineering Simulation

Modern Mechanical engineering 2016年第2期6卷 76-90页

作者： valery Katz Slava Katz SCe—Sami Shamoon College of engineering Beer-Sheva Israel

Here we suggest an algorithm for calculation of the process parameters and design of a vertical cooler with inclined, gas-permeable blades and with a vibrating, suspended layer of granules on them (Vibrating Fluidized Bed—VFB). The algorithm is based on the use of the equations of heat and material balance, taking into account the influx of moisture into the layer with cold air and dust—as a carryover. Mode entrainment of dust particles and moisture from the VFB is described by using empirical formulas and Π-theorem. To calculate the cooling time of granules a model of the dynamics of a variable mass VFB was built, which linked the geometrical and physical process parameters to a single dependency. An example showed that mass flow of granules of 248 kg/h and a volume flow of air of 646 m3/h with temperature of 30℃ to cool the zeolite granules from 110℃ to 42℃ for 49 s required a vertical apparatus of rectangular shape with four chambers and with volume of 0.2 m3. A comparative analysis of technological parameters of the projected cooler with the parameters of typical industrial apparatuses showed that for all indicators: the cooling time of granules, the flow rate of gas (air) and the heat flow, a 4-chambered, vertical apparatus of rectangular shape with VFB was the most effective.

关键词： Cooling of Granules Vibrating Fluidized Bed Mathematical Model Calculation Algorithm

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Anomalous Laterally Stressed Kinetically Trapped DNA Surface Conformations

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Nano-Micro Letters 2021年第8期13卷 263-280页

作者： valery V.Prokhorov Nikolay A.Barinov Kirill A.Prusakov evgeniy V.Dubrovin Maxim D.Frank-Kamenetskii Dmitry V.Klinov Federal Research and Clinical Center of Physical-Chemical Medicine Malaya Pirogovskaya1aMoscow 119435Russian Federation A.N.Frumkin Institute of Physical Chemistry and electrochemistry RASLeninsky prospect Moscow 199071 Russian Federation 3 Moscow Institute of Physics and TechnologyInstitutskiy per.9Dolgoprudny141700 MoscowRussian Federation Lomonosov Moscow State University Leninskie gory1-2Moscow 119991Russian Federation Department of Biomedical engineering Boston University44 Cummington MallBoston MA02215USA

Up to now,the DNA molecule adsorbed on a surface was believed to always preserve its native *** belief implies a negligible contribution of lateral surface forces during and after DNA adsorption although their impact has never been ***-resolution atomic force microscopy was used to observe that stiff DNA molecules kinetically trapped on monomolecular films comprising one-dimensional periodically charged lamellar templates as a single layer or as a sublayer are oversaturated by sharp discontinuous kinks and can also be locally melted and *** argue that kink/anti-kink pairs are induced by an overcritical lateral bending stress(>30 pNnm)inevitable for the highly anisotropic 1D-1D electrostatic interaction of DNA and underlying rows of positive surface *** addition,the unexpected kink-inducing mechanical instability in the shape of the template-directed DNA confined between the positively charged lamellar sides is observed indicating the strong impact of *** previously reported anomalously low values of the persistence length of the surface-adsorbed DNA are explained by the impact of the surface-induced low-scale *** sites of the local melting and supercoiling are convincingly introduced as other lateral stress-induced structural DNA anomalies by establishing a link with DNA high-force *** results open up the study in the completely unexplored area of the principally anomalous kinetically trapped DNA surface conformations in which the DNA local mechanical response to the surface-induced spatially modulated lateral electrostatic stress is essentially *** underlying rich and complex in-plane nonlinear physics acts at the nanoscale beyond the scope of applicability of the worm-like chain approximation.

关键词： DNA surface conformations Kinetic trapping Lateral stress Periodically charged surface DNA kinks

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A Spiral History of the Development of Ways to Identify the Correct Position of the Injection Needle in Relation to the Peripheral Nerve: A Brief Historical essay

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Open Journal of Anesthesiology 2023年第5期13卷 95-100页

作者： valery Piacherski Lidziya Muzyka Department of Anesthesiology and Intensive Care Mogilev Regional Clinical Hospital Mogilev Belarus Department of Anesthesiology and Intensive Care Сentral District Hospital of Krugloe Krugloe Belarus Department of Anesthesiology and Intensive Care Сentral District Hospital of Belynichi Belynichi Belarus

The first way to identify the needle in relation to the peripheral nerve W. Halsted and R. Hall in 1884 performed the first regional blockade (using direct visualization). However, Vassily von Anrep was a few months earlier described the blockade of the peripheral nerve by anatomical landmarks. In 1912, the blockade of the brachial plexus was first performed using electrical stimulation, but this technique has been widely used only since 1962. The most popular way to identify the needle relative to the nerve at the moment remains US guidance. A promising direction may be optical coherence tomography. But this method is under development. In the last decade, a method for determining the pressure of a local anesthetic has been introduced into practice to determine the position of the needle relative to the nerve.

关键词： Regional Anesthesia electrical Nerve Stimulation Ultrasound Guidance Оptical Coherence Tomography Local Anesthetic Pressure Injection Pressure

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Mass Transfer in a Centrifugal Turbine Agitator-Pump

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Journal of Water Resource and Protection 2014年第5期6卷 463-472页

作者： valery Katz Gedalya Mazor SCe—Sami Shamoon College of engineering Beer-Sheva Israel

This article is a continuation of the research, centering on a vacuum-filtration system, which is designed to reduce the concentration of calcium in water;a process is also known as—water softening. The problem of solving the concentration distribution of the initial (embryonic) particles of CaCO3-particles, which were introduced into the limited volume of the apparatus with a turbine agitator-pump, is addressed through the use of diffusion and deterministic-stochastic models of mass transfer. The solution of the extreme problem allows determining the most important process parameters, such as time of dispersions homogenization and the dispersion mass flow rate to the surface of a special filter. For these parameters a comparative analysis of the adequacy of the theory was found through experiments, performed in the study. We found that uniform distribution of concentrations along the height of the apparatus is achieved by the angular velocity of the rotation 400 rpm for the turbine with 6 - 7 blades at the time of homogenization 14s. In this case, the dispersion mass flow to the surface of the cylindrical filter is 3 50 mg/s at an average concentration of the introduced CaCO3 particles, which is equal to 10 g/L. We determined that the accuracy of the results depends on: the coordinates of the material input in the apparatus volume, the surface shape of the filter and the volumetric flow rate of the liquid (water), being discarded by the turbine blades in the normal direction to their surface.

关键词： Calcium Removal Dispersion Mass Transfer Modeling Adequacy

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Flare evolution and polarization changes in fine structures of solar radio emission in the 2013 April 11 event

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Research in Astronomy and Astrophysics 2016年第2期16卷 69-80页

作者： Gennady Chernov Robert Sych Bao-Lin Tan Yi-Hua Yan Cheng-Ming Tan Qi-Jun Fu Marian Karlicky valery Fomichev Key Laboratory of Solar Activity National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100012China Pushkov Institute of Terrestrial Magnetism Ionosphere and Radio Wave PropagationRussian Academy of Sciences(IZMIRAN)TroitskMoscow region142190Russia Yunnan Observatories Chinese Academy of SciencesKunming 650011China Institute of Solar-Terrestrial Physics Russian Academy of SciencesSiberian BranchIrkutsk 664033Russia Astronomical Institute of the Academy of Sciences of the Czech Republic Ondrejov 15165Czech Republic

The measurement of positions and sizes of radio sources in observations is important for un- derstanding of the flare evolution. For the first time, solar radio spectral fine structures in an M6.5 flare that occurred on 2013 April 11 were observed simultaneously by several radio instruments at four different observatories： Chinese Solar Broadband Radio Spectrometer at Huairou （SBRS/Huairou）, Ondrejov Radio Spectrograph in the Czech Republic （ORSC/Ondrejov）, Badary Broadband Microwave Spectropolarimeter （BMS/Irkutsk）, and spectrograph/IZMIRAN （Moscow, Troitsk）. The fine structures included microwave zebra patterns （ZPs）, fast pulsations and fiber bursts. They were observed during the flare brightening lo- cated at the tops of a loop arcade as shown in images taken by the extreme ultraviolet （eUV） telescope onboard NASA＇s satellite Solar Dynamics Observatory （SDO）. The flare occurred at 06：58-07：26 UT in solar active region NOAA 11719 located close to the solar disk center. ZPs appeared near high frequency boundaries of the pulsations, and their spectra observed in Huairou and Ondrejov agreed with each other in terms of details. At the beginning of the flare＇s impulsive phase, a strong narrowband ZP burst occurred with a moderate left-handed circular polarization. Then a series of pulsations and ZPs were observed in almost unpolarized emission. After 07：00 UT a ZP appeared with a moderate right-handed polarization. In the flare decay phase （at about 07：25 UT）, ZPs and fiber bursts become strongly right-hand polarized. BMS/Irkutsk spectral observations indicated that the background emission showed a left-handed circular polarization （similar to SBRS/Huairou spectra around 3 GHz）. However, the fine structure appeared in the right-handed polarization. The dynamics of the polarization was associated with the motion of the flare ex- citer, which was observed in eUV images at 171 A and 131 A by the SDO Atmospheric Imaging Assembly （AIA）. Combining magnetograms observed by t

关键词： Sun activity -- Sun flares -- Sun particle emission -- Sun radio radiation -- zebra-pattern

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