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Product design based on discrete particle modeling of a fluidized bed granulator

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Particuology 2014年第1期12卷 13-24页

作者： Lennart Fries sergiy Antonyuk Stefan Heinrich Gerhard Niederreiter Stefan Palzer Nestlé Research Center Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology

Fluidized bed agglomeration is a process commonly used to construct powdered food or pharmaceuti cal products to improve their instant properties. This works analyzes the influence of a wide range of operating parameters （i.e., fluidization air flow rate, temperature, and liquid injection rate） on growth rate, process stability, and product particle structure. Different granulator configurations （i.e., top spray, Wurster coater, spouted bed） are compared using identical process parameters. The impacts of both pro cess variables and granulator geometry on the fluidization regime, the particle and collision dynamics, and the resulting product structure and corresponding properties are studied in detailed simulations using a discrete particle model （DPM） and labscale agglomeration experiments with amorphous dextrose syrup （DE21）. The combination of numerical and experimental results allows to correlate the kinetics of micro scale particle interactions and the final product properties （i.e., agglomerate structure and strength）. In conclusion, detailed DPM simulations are proven as a valuable tool for knowledgebased product design.

关键词： FluidizationAgglomerationDiscrete element methodFood powderCollision dynamics

CFD–DEM simulation of fine particles in a spouted bed apparatus with a Wurster tube

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Particuology 2019年第1期17卷 114-125页

作者： Paul Breuninger Dominik Weis Isabell Behrendt Philipp Grohn Fabian Krull sergiy Antonyuk Institute of Particle Process Engineering University of KaiserslauternGottlieb Daimler Str.. KaiserslauternGermany

In this work, a coupled computational fluid dynamics–discrete element method (CFD–DEM) approach was employed to evaluate the spouting behavior of fine, cohesive powders in a cylindrical spouted bed with a conical base and equipped with a Wurster tube. The particle and gas dynamics inside the apparatus were simulated with 1.7 million spherical ZrO2 particles with a particle size of 100 μm. For an accurate prediction of the interactions of cohesive particles in the spouted bed, the adhesion forces according to JKR theory were included in the Hertz–Tsuji contact model. The surface energy of the particles was varied over a wide range to determine the effect of the adhesion on the spouting (the fountain shape and maximum height as well as the distribution of the concentrations and velocities of particles in different zones of the apparatus). A detailed analysis of the collision dynamics was conducted. The spouting behavior of a spouted bed with the same dimensions, particles, and processing parameters was recorded with a high-speed camera. The CFD–DEM simulations showed good agreement with the experimentally captured spouting behavior.

关键词： CFD–DEM Spouted bed Wurster tube Cohesive powder

Effect of CeO_2 and Al_2O_3 on the activity of Pd/Co_3O_4/cordierite catalyst in the three-way catalysis reactions(CO/NO/C_nH_m)

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Journal of Environmental Sciences 2012年第7期24卷 1327-1333页

作者： sergiy O.Soloviev Pavlo I.Kyriienko Nataliia O.Popovych L.V.Pisarzhevsk Institute of Physical Chemistry National Academy of Sciences of Ukraine

The present article studies the effect of CeO2 and A1203 on the activity of Pd/Co304/cordierite catalyst in conversion of NO, CO, CnHm. The catalysts were characterized by temperature programmed reduction with hydrogen, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. It is shown that the effect of CeO2 on the properties of Pd/C03 O4/cordierite catalyst depends on preparation method. The catalyst obtained by co-deposition of cerium and cobalt oxides has higher activity in CO oxidation （CO ＋ 02 and CO ＋ NO） and total hexane oxidation （C6H14 ＋ 02）. Such phenomenon is probably caused by more than stoichiometric amount of formed oxygen vacancies, an increase in both mobility of surface oxygen and dispersity of components in the catalytic composition. It is demonstrated that CeO2 addition promotes the SO2 resistance of Pd/C03 O4/cordierite. The second support decreases the activity of Pd/Co3Oa/cordierite catalyst in the reactions of CO and C6H14 with oxygen because of COA1204 formation.

关键词： metal-oxide catalysts structured catalysts effect of CeO2 and A1203 CO NO CnH,. conversion

Oxidation of diesel soot on binary oxide Cu Cr(Co)-based monoliths

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Journal of Environmental Sciences 2015年第2期27卷 171-177页

作者： sergiy O.Soloviev Andriy Y.Kapran Yaroslava P.Kurylets L.V.Pisarzhevskii Institute of Physical Chemistry National Academy of Sciences of Ukraine

Binary oxide systems（Cu Cr2O4, Cu Co2O4）, deposited onto cordierite monoliths of honeycomb structure with a second support（finely dispersed Al2O3）, were prepared as filters for catalytic combustion of diesel soot using internal combustion engine’s gas exhausts（O2, NOx, H2 O, CO2） and O3 as oxidizing agents. It is shown that the second support increases soot capacity of aforementioned filters, and causes dispersion of the particles of spinel phases as active components enhancing thereby catalyst activity and selectivity of soot combustion to CO2. Oxidants used can be arranged with reference to decreasing their activity in a following series： O3 NO2〉 H2 O 〉 NO 〉 O2〉 CO2. Ozone proved to be the most efficient oxidizing agent： the diesel soot combustion by O3 occurs intensively（in the presence of copper chromite based catalyst） even at closing to ambient *** obtained give a basis for the conclusion that using a catalytic coating on soot filters in the form of aforementioned binary oxide systems and ozone as the initiator of the oxidation processes is a promising approach in solving the problem of comprehensive purification of automotive exhaust gases at relatively low temperatures, known as the ＂cold start＂ problem.

关键词： Catalyzed diesel particulate filters Cu Cr2O4 Cu Co2O4catalytic coatings Cordierite monoliths Second support Oxidizing agents Ozone

A Novel Method for Solving Time-Dependent 2D Advection-Diffusion-Reaction Equations to Model Transfer in Nonlinear Anisotropic Media

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Communications in Computational Physics 2019年第6期26卷 233-264页

作者： Ji Lin sergiy Reutskiy C.S.Chen Jun Lu State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering International Center for Simulation Software in Engineering and SciencesCollege of Mechanics and MaterialsHohai UniversityNanjing 211100China State Institution"Institute of Technical Problems of Magnetism of the National Academy of Sciences of Ukraine" Industrialnaya St.1961106KharkovUkraine Department of Mathematics University of Southern MississippiHattiesburgMS 39406USA Nanjing Hydraulic Research Institute Nanjing 210029China State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering Nanjing 210098China

This paper presents a new numerical technique for solving initial and bound-ary value problems with unsteady strongly nonlinear advection diffusion reaction(ADR)*** method is based on the use of the radial basis functions(RBF)for the approximation space of the *** Crank-Nicolson scheme is used for approximation in *** results in a sequence of stationary nonlinear ADR *** equations are solved sequentially at each time step using the proposed semi-analytical technique based on the *** approximate solution is sought in the form of the analytical expansion over basis functions and contains free *** basis functions are constructed in such a way that the expansion satisfies the boundary conditions of the problem for any choice of the free *** free parameters are determined by substitution of the expansion in the equation and collocation in the solution *** the case of a nonlinear equation,we use the well-known procedure of *** transforms the original equation into a sequence of the linear ones on each time *** numerical examples confirm the high accuracy and robustness of the proposed numerical scheme.

关键词： Advection diffusion reaction time-dependent fully nonlinear anisotropic media Crank-Nicolson scheme meshless method

Jacques Derrida's Origin of Literature,with Impossible Filiations

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比较文学与世界文学

比较文学与世界文学 2014年第1期 28-36页

作者： sergiy Yakovenko 加拿大阿尔伯塔大学

In his"Resistance to Theory,"Paul de Man suggests that literary theory"should address such questions as the definition of literature(what is literature?)and discuss the distinction between literary and non-literary uses of language,as well as between literary and non-verbal forms of art."(4)Although the questions that de Man poses in his famous essay are of a structuralist and dialectical nature(to mention at

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Perspectives on protected area and wildfire management in the Black Sea region

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Journal of Forestry Research 2020年第1期31卷 257-268页

作者： George N.Zaimes Petros A.Tsioras Chrysovalantis Kiosses Mustafa Tufekcioglu sergiy Zibtsev Ilya Trombitsky Razvan Uratu Luiza Gevorgyan Department of Forestry and Natural Environment Management Eastern Macedonia and Thrace Institute of Technology(EMaTTech)1st km Drama66100 MikrohoriouDramaGreece Department of Forestry and Natural Environment Aristotle University of ThessalonikiP.O.Box 22754124 Thessalonı´kiGreece 66100 Choristi DramaGreece Artvin Coruh University ArtvinTurkey National University of Life and Environmental Sciences of Ukraine KievUkraine Eco-TIRAS International Association of River Keepers Chis¸ina˘uRepublic of Moldova Prefect’s Institution of Braila County BrailaRomania Zikatar Environmental Centre Ministry of Nature ProtectionYerevanRepublic of Armenia

Protected areas are necessary for the conservation and enhancement of *** are major threats to forests and other natural areas,because they may cause irreversible *** aim of this study was to analyze the perspective of experts(N=284),from six countries of the Black Sea,on the current status and problems of protected areas and *** their points of view could enhance future management on these issues in the *** collection was carried out for 9 months,using a web-based *** were perceived as a serious problem in Turkey,Armenia and Greece but as a substantially less serious problem in Romania,Ukraine and *** Greece,Armenia,and especially Ukraine,the current designated protected areas are considered sufficient to maintain biodiversity,while in Romania,Turkey,and especially Moldova,more areas should be designated as protected.A major need in all countries(except for Turkey)is the increased use of information and communication technologies for both wildfire suppression and protected area *** were divided on whether wildfire suppression and management of protected areas are ***,there is growing awareness of the adverse impacts of climate change in protected areas and the frequency of wildfires in the *** most frequently suggested measures to alleviate these impacts were:changes in forest management and increasing public awareness for wildfire suppression,along with changes in forest management and increased staff training to enhance protected area conservation.

关键词： Climate change Experts Forested areas Web-based questionnaires

Self-driven highly responsive p-n junction In Se heterostructure near-infrared light detector

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Photonics Research 2022年第7期10卷 I0001-I0009页

作者： CHANDRAMAN PATIL CHAOBO DONG HAO WANG BEHROUZ MOVAHHED NOURI sergiy KRYLYUK HUAIRUO ZHANG ALBERT V.DAVYDOV HAMED DALIR VOLKER J.SORGER Department of Electrical and Computer Engineering George Washington UniversityWashingtonD.C.20052USA Optelligence LLC Upper MarlboroMaryland 20772USA Materials Science and Engineering Division National Institute of Standards and TechnologyGaithersburgMaryland 20899USA Theiss Research Inc.La JollaCalifornia 92037USA

Photodetectors converting light signals into detectable photocurrents are ubiquitously in use *** improve the compactness and performance of next-generation devices and systems,low dimensional materials provide rich physics to engineering the light-matter *** based on two-dimensional(2D)material van der Waals heterostructures have shown high responsivity and compact integration capability,mainly in the visible range due to their intrinsic *** spectral region of near-infrared(NIR)is technologically important,featuring many data communication and sensing *** some initial NIR 2D material-based detectors have emerged,demonstrations of doping-junction-based 2D material photodetectors with the capability to harness the charge-separation photovoltaic effect are yet ***,we demonstrate a 2D p-n van der Waals heterojunction photodetector constructed by vertically stacking p-type and n-type indium selenide(In Se)*** heterojunction charge-separation-based photodetector shows a threefold enhancement in responsivity in the NIR spectral region(980 nm)as compared to photoconductor detectors based on p-or n-only doped In *** show that this junction device exhibits self-powered photodetection operation,exhibits few p A-low dark currents,and is about 3-4 orders of magnitude more efficient than the state-of-the-art foundry-based *** capability opens doors for low noise and low photon flux photodetectors that do not rely on external *** further demonstrate millisecond response rates in this sensitive zero-bias voltage *** sensitive photodetection capability in the technologically relevant NIR wavelength region at low form factors holds promise for several applications including wearable biosensors,three-dimensional(3D)sensing,and remote gas sensing.

关键词： heterojunction light separation

Defect detection in atomic-resolution images via unsupervised learning with translational invariance

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npj Computational Materials 2021年第1期7卷 1640-1648页

作者： Yueming Guo Sergei V.Kalinin Hui Cai Kai Xiao sergiy Krylyuk Albert V.Davydov Qianying Guo Andrew R.Lupini Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831USA Material Measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA

Crystallographic defects can now be routinely imaged at atomic resolution with aberration-corrected scanning transmission electron microscopy(STEM)at high speed,with the potential for vast volumes of data to be acquired in relatively short times or through autonomous experiments that can continue over very long *** detection and classification of defects in the STEM images are needed in order to handle the data in an efficient ***,like many other tasks related to object detection and identification in artificial intelligence,it is challenging to detect and identify defects from STEM ***,it is difficult to deal with crystal structures that have many atoms and low *** methods used for defect detection and classification were based on supervised learning,which requires human-labeled *** this work,we develop an approach for defect detection with unsupervised machine learning based on a one-class support vector machine(OCSVM).We introduce two schemes of image segmentation and data preprocessing,both of which involve taking the Patterson function of each segment as *** demonstrate that this method can be applied to various defects,such as point and line defects in 2D materials and twin boundaries in 3D nanocrystals.

关键词： handle resolution image