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Evaluation of airlift pump performance for vertical conveying of coal particles

International Journal of Coal Science & Technology 2023年第3期10卷 155-166页

作者： Parviz Enany oleksandr shevchenko Carsten Drebenshtedt Faculty of Mining and Special Civil Engineering Technische Universitat BergakademieGustav-Zeuner StraBe 1A09599 FreibergGermany UTF GmbH ErzstraBe 1509618 Brand-ErbisdorfGermany

One of the crucial aspects of reducing air consumption when conveying particles with an airlift pump is to know the factors that affect the process of particle motion at an initial velocity of *** determine the influence of submer-gence ratio and physical properties of particles(such as size,shape,and mass)on the onset of vertical particle motion,the airlift pump was taken as the research object,and spherical glass together with irregular shaped coal were used as experimental test *** results show that unlike the water-solid environment,the start of particle motion in the water-air mixture does not always occur at a certain value of superficial water velocity and this value also increases with increasing submergence *** the parameters considered,the role of submergence ratio is much more effective than the dimensions and the shape of the particle,because by increasing submergence from 0.3 to 0.8,it is possible to reduce air consumption by up to 8 *** on this study the corresponding theoretical model derived by Fujimoto et *** optimized,wherein the overall agreement between the modified theory and present experimental data is particularly *** to Fujimoto,the minimum superficial water velocity for lifting solids in the air-water mixture is not always smaller than water ambient which indicates on optimum submergence ratio higher than ***,a new criterion was introduced to describe the moment of onset of the particle motion as a function of the superficial fluid velocity ratio for each submergence value.

关键词： Air-water-solid flow Slurry- Coal Submergence ratio Taylor bubble Superficial velocity

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Crosstalk between gut microbiota and antidiabetic drug action

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World Journal of Diabetes 2019年第3期10卷 154-168页

作者： Yevheniia Kyriachenko Tetyana Falalyeyeva oleksandr Korotkyi Nataliia Molochek Nazarii Kobyliak Educational and Scientific Centre “Institute of Biology and Medicine” Taras Shevchenko National University of Kyiv Kyiv 01601 Ukraine Endocrinology Department Bogomolets National Medical University Kyiv 01601 Ukraine

Type 2 diabetes (T2D) is a disorder characterized by chronic inflated blood glucose levels (hyperglycemia), at first due to insulin resistance and unregulated insulin secretion but with tendency towards global spreading. The gut microbiota is recognized to have an influence on T2D, although surveys have not formed a clear overview to date. Because of the interactions between gut microbiota and host homeostasis, intestinal bacteria are believed to play a large role in various diseases, including metabolic syndrome, obesity and associated disease. In this review, we highlight the animal and human studies which have elucidated the roles of metformin,α-glucosidase inhibitors, glucagon-like peptide-1 agonists, peroxisome proliferator-activated receptors γ agonists, inhibitors of dipeptidyl peptidase-4, sodium/glucose cotransporter inhibitors, and other less studied medications on gut microbiota. This review is dedicated to one of the most widespread diseases, T2D, and the currently used antidiabetic drugs and most promising new findings. In general, the gut microbiota has been shown to have an influence on host metabolism, food consumption, satiety, glucose homoeostasis, and weight gain. Altered intestinal microbiota composition has been noticed in cardiovascular diseases, colon cancer, rheumatoid arthritis, T2D, and obesity. Therefore, the main effect of antidiabetic drugs is on the microbiome composition, basically increasing the short-chain fatty acids-producing bacteria, responsible for losing weight and suppressing inflammation.

关键词： Type 2 diabetes Gut microbiota Metformin α-glucosidase inhibitors Glucagon-like peptide-1 agonists Peroxisome proliferator-activated receptors γ agonists Dipeptidyl peptidase-4 inhibitors Sodium/glucose cotransporter inhibitors

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The Universal Expression for the Amplitude Square in Quantum Electrodynamics

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Journal of Modern Physics 2015年第15期6卷 2219-2225页

作者： Konstantin Karplyuk oleksandr Zhmudskyy Department of Radiophysics Taras Shevchenko University Kyiv Ukraine Department of Physics University of Central Florida Orlando FL USA

The universal expression for the amplitude square ?for any matrix of interaction M is derived. It has obvious covariant form. It allows the avoidance of calculation of products of the Dirac’s matrices traces and allo... 详细信息

关键词： Quantum Electrodynamics Amplitude Square Polarized Particles

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Phenomenological Simulation Study of Neuronal Activity Synchronization in 110 Elements Network

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Journal of Physical Science and Application 2013年第4期3卷 217-223页

作者： Karpenko Kateryna Yatsiuk Ruslan Kononov Myhailo Sudakov oleksandr Radiophysical Department Taras Shevchenko National University of Kyiv Kyiv 03022 Ukraine

The phenomenon of activity synchronization in biological neural network is considered. Simulation of neurons dynamics in the 6-layer neural network with 110 elements in different regimes: regular spikes, chaotic spikes, regular and chaotic bursting, etc was performed. Izhykevich"s phenomenological model that displays different types of activity inherent for real biological neurons was used for simulation. Space-time diagram for the entire network and raster plots for the whole structure and for each layer separately were built for visual inspection of neural network activity synchronization. Synchronization coefficients based on cross-correlation times of action potentials for all neurons pairs were calculated for the whole neural system and for each layer separately.

关键词：生物神经网络神经元电活动时间同步元素仿真生物神经元唯象模型目视检查

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