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Tungsten Resource-Saving： Cobalt Cermets Wastes Recycling and Concentrates Extraction

Journal of Environmental Science and Engineering(B) 2015年第10期4卷 521-528页

作者： Viktor Malyshev Dmytro Shakhnin Angelina Gab Nataliya Uskova Oleksandr Gudymenko volodymyr glushakov Nina Kushchevska Department of Physical Chemistry of Ionic Liquids EL Vernadsky Institute of General and Inorganic Chemistry National Academy of Sciences of Ukraine Kyiv 03142 Ukraine Faculty of Chemistry & Technology National Technical University of Ukraine "Kyiv Polytechnical Institute" Kyiv 03056 Ukraine Faculty of Engineering & Technology University "Ukraine" Kyiv 03115 Ukraine

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Modeling of the effect of hydrogen injection on blast furnace operation and carbon dioxide emissions

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International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1851-1861页

作者： volodymyr Shatokha National Metallurgical Academy of Ukraine Dnipro 49005Ukraine

The effect of hydrogen injection on blast furnace operation and carbon dioxide emissions was simulated using a 1D steady-state zonal *** maximum hydrogen injection rate was evaluated on the basis of the simulation of the vertical temperature pattern in the blast furnace with a focus on the thermal reserve *** effects of blast temperature and oxygen enrichment were also examined to estimate coke replacement ratio,productivity,hydrogen utilization efficiency,and carbon dioxide emission *** blast temperature of 1200℃,the maximum hydrogen injection rate was 19.0 and 28.3 kg of H_(2)/t of hot metal(HM)for oxygen enrichment of 2vol%and 12vol%,*** showed a coke replacement ratio of 3-4 kg of coke/kg of H_(2),direct CO_(2) emission reduction of 10.2%-17.8%,and increased productivity by up to 13.7%depending on oxygen enrichment *** blast temperature further reduced the direct CO_(2) *** utilization degree reached the maximum of 0.52-0.54 H_(2)O/(H_(2)O+H_(2)).The decarbonization potential of hydrogen injection was estimated in the range from 9.4 t of CO_(2)/t of H_(2) to 9.7 t of CO_(2)/t of H_(2).For economic feasibility,hydrogen injection requires revolutionary progress in terms of low-cost H_(2) generation unless the technological change is motivated by the carbon emission *** injection may unfavorably affect the radial temperature pattern of the raceway,which could be addressed by adopting appropriate injection techniques.

关键词： hydrogen injection blast furnace zonal model carbon dioxide emissions

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Cluster Representation of the Structural Description of Images for Effective Classification

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Computers, Materials & Continua 2022年第12期73卷 6069-6084页

作者： Yousef Ibrahim Daradkeh volodymyr Gorokhovatskyi Iryna Tvoroshenko Medien Zeghid Department of Computer Engineering and Networks College of Engineering at Wadi AddawasirPrince Sattam Bin Abdulaziz UniversityWadi Addawasir11991Saudi Arabia Department of Informatics Kharkiv National University of Radio ElectronicsKharkiv61166Ukraine Electrical Engineering Department College of Engineering at Wadi AddawasirPrince Sattam Bin Abdulaziz UniversityWadi Addawasir11991Saudi Arabia Electronics and Micro-Electronics Laboratory Faculty of SciencesUniversity of MonastirMonastir5000Tunisia

The problem of image recognition in the computer vision systems is being *** results of the development of efficient classification methods,given the figure of processing speed,based on the analysis of the segment representation of the structural description in the form of a set of descriptors are *** propose three versions of the classifier according to the following principles:“object-etalon”,“object descriptor-etalon”and“vector description of the object-etalon”,which are not similar in level of integration of researched data *** options for constructing clusters over the whole set of descriptions of the etalon database,separately for each of the etalons,as well as the optimal method to compare sets of segment centers for the etalons and object,are *** experimental rating of the efficiency of the created classifiers in terms of productivity,processing time,and classification quality has been realized of the *** proposed methods classify the set of etalons without *** have formed the inference about the efficiency of classification approaches based on segment *** time of image processing according to the developedmethods is hundreds of times less than according to the traditional one,without reducing the accuracy.

关键词： Cluster representation computer vision description relevance descriptor image classification keypoint processing speed vector space

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Classification of Images Based on a System of Hierarchical Features

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Computers, Materials & Continua 2022年第7期72卷 1785-1797页

作者： Yousef Ibrahim Daradkeh volodymyr Gorokhovatskyi Iryna Tvoroshenko Mujahed Al-Dhaifallah Department of Computer Engineering and Networks College of Engineering at Wadi AddawasirPrince Sattam Bin Abdulaziz UniversityAl-Kharj11991Saudi Arabia Department of Informatics Kharkiv National University of Radio ElectronicsKharkiv61166Ukraine Control and Instrumentation Engineering Department and Interdisciplinary Research Center(IRC)for Renewable Energy and Power SystemsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia

The results of the development of the new fast-speed method of classification images using a structural approach are *** method is based on the system of hierarchical features,based on the bitwise data distribution for the set of descriptors of image *** article also proposes the use of the spatial data processing apparatus,which simplifies and accelerates the classification *** have shown that the time of calculation of the relevance for two descriptions according to their distributions is about 1000 times less than for the traditional voting procedure,for which the sets of descriptors are *** introduction of the system of hierarchical features allows to further reduce the calculation time by 2–3 times while ensuring high efficiency of *** noise immunity of the method to additive noise has been experimentally *** to the results of the research,the marginal degree of the hierarchy of features for reliable classification with the standard deviation of noise less than 30 is the 8-bit *** costs increase proportionally with decreasing bit *** method can be used for application tasks where object identification time is critical.

关键词： Bitwise distribution computer vision descriptor hierarchical representation image classification keypoint noise immunity processing speed

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Belgica antarctica(Diptera: Chironomidae): A natural modelorganism for extreme environments

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Insect Science 2022年第1期29卷 2-20页

作者： Iryna Kozeretska Svitlana Serga Pavlo Kovalenko volodymyr Gorobchyshynand Peter Convey National Antarctic Scientific Center of Ukraine 01601Taras Shevchenko blv.16KyivUkraine Taras Shevchenko National Universityof Kyiv Department General and Medical Genetics01601Volodymyrska str.64/13KyivUkraine State Institution«Institute for Evolu-tionary Ecology of the National Academy of Sciences of Ukraine» Department of Population Dynamics03143Lebedeva str.37KyivUkraine and4British Antarctic SurveyNERCHigh CrossMadingley RoadCambridge CB30ETUnited Kingdom

Belgica antarctica(Diptera:Chironomidae),a brachypterous midge endemicto the maritime Antarctic,was first described in *** more than a century of study,a vast amount of information has been compiled on the species(3750000 Google searchresults as of January 10,2021),encompassing its ecology and biology,life cycle and re-production,polytene chromosomes,physiology,biochemistry and,increasingly,***2014,***’s genome was sequenced,further boosting *** develop-mental stages can be cultured successfully in the *** together,this wealthof information allows the species to be viewed as a natural model organism for studies ofadaptation and function in extreme environments.

关键词： Belgica antarctica Chironomidae stress adaptation Antarctica

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Neocuspidization of the Pulmonary Valve with Autologous Pericardium in the Adult Patient with Ventricular Septal Defect and Infective Endocarditis: A Case Report and Review of the Literature

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Congenital Heart Disease 2022年第6期17卷 641-646页

作者： Igor Mokryk Vitaly Demyanchuk volodymyr Vashkeba Ilya Nechay Borys Todurov Department of Adult Cardiac Surgery Heart InstituteKyivUkraine Department of Pediatric Cardiac Surgery Heart InstituteKyivUkraine

Congenital heart disease (CHD) is one of the risk factors for developing infective endocarditis (IE). Right-sided IEoccurs in 5%–10% of endocarditis cases, and pulmonary valve (PV) is involved in less than 2% of such *** data are few, and optimal treatment methods, indications for surgery, and types of operative techniquesare still under debate. We present an adult patient with a rare combination of the ventricular septal defect (VSD)and PV IE who underwent surgical treatment. Neocuspidization with autologous pericardium was utilized for thereconstruction of his PV. We discuss details of this novel surgical technique.

关键词： Infective endocarditis pulmonary valve neocuspidization ozaki technique congenital heart disease

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Phytochemical Analysis and Antioxidant Activity of Crocus speciosus Leaves

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Phyton-International Journal of Experimental Botany 2022年第1期91卷 207-221页

作者： Olha Mykhailenko Ivan Bezruk Victoriia Volochai volodymyr Mishchenko Liudas Ivanauskas Victoriya Georgiyants Department of Pharmaceutical Chemistry National University of PharmacyKharkiv61168Ukraine Department of Pharmacognosy National University of PharmacyKharkiv61168Ukraine Department of Quality Standardisation and Certification of DrugsNational University of PharmacyKharkiv61001Ukraine Department of Analytical and Toxicological Chemistry Lithuanian University of Health SciencesKaunas44307Lithuania

The numerous studies indicate leaves of plants are a rich source of bioactive compounds that can be a valuable source of compounds used in the pharmaceutical and cosmetic *** of this study was to investigate the chemical composition and the antioxidant property of Crocus speciosus *** phytochemical screening of *** leaves revealed the presence of some following compound categories such as phenolic compounds,aminoacids,saponins,proteins,tannins,triterpenoids,glycosides,*** total flavonoids and phenolic compounds content were determined spectrophotometrically and by HPLC-DAD and *** activity was determined by ABTS radical-cation scavenging method,*** total amount of flavonoids in *** leaves was 1.07±0.02 mg RE/g(p<0.05),the total amount of phenolic compounds was 0.41±0.01 mg GAE/g(p<0.05).By HPLC-DAD-MS analysis the presence of the mangiferin,chlorogenic acid,isoorientin,kaempferol,hyperoside,and isoquercitin was established for the first time in Crocus *** antiradical activity of *** leaves extracts was 150.08±4.5μmol/g(p<0.05)and its was mainly attributed to phenolic compounds *** high amounts of flavonoids and antiradical activity in *** leaves suggests promising phytochemical and pharmacological study of this Crocus species.

关键词： Crocus speciosus flavonoids leaves antiradical activity

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Deep Semisupervised Learning-Based Network Anomaly Detection in Heterogeneous Information Systems

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Computers, Materials & Continua 2022年第1期70卷 413-431页

作者： Nazarii Lutsiv Taras Maksymyuk Mykola Beshley Orest Lavriv volodymyr Andrushchak Anatoliy Sachenko Liberios Vokorokos Juraj Gazda Lviv Polytechnic National University Lviv79013Ukraine West Ukrainian National University Ternopil46009Ukraine Technical University of Kosice Kosice04200Slovakia

The extensive proliferation of modern information services and ubiquitous digitization of society have raised cybersecurity challenges to new *** the massive number of connected devices,opportunities for potential network attacks are nearly *** additional problem is that many low-cost devices are not equippedwith effective security protection so that they are easily hacked and applied within a network of bots(botnet)to perform distributed denial of service(DDoS)*** this paper,we propose a novel intrusion detection system(IDS)based on deep learning that aims to identify suspicious behavior in modern heterogeneous information *** proposed approach is based on a deep recurrent autoencoder that learns time series of normal network behavior and detects notable network *** additional feature of the proposed IDS is that it is trained with an optimized dataset,where the number of features is reduced by 94%without classification accuracy ***,the proposed IDS remains stable in response to slight system perturbations,which do not represent network *** proposed approach is evaluated under different simulation scenarios and provides a 99%detection accuracy over known datasets while reducing the training time by an order of magnitude.

关键词： DDoS deep semisupervised learning cybersecurity anomaly detection

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Disaster Impacts Surveillance from Social Media with Topic Modeling and Feature Extraction: Case of Hurricane Harvey

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International Journal of Disaster Risk Science 2022年第5期13卷 729-742页

作者： volodymyr V.Mihunov Navid H.Jafari Kejin Wang Nina S.N.Lam Dylan Govender Department of Environmental Sciences Louisiana State UniversityBaton RougeLA 70803USA Department of Civil and Environmental Engineering Louisiana State UniversityBaton RougeLA 70803USA Division of Electrical and Computer Engineering Louisiana State UniversityBaton RougeLA 70803USA

Twitter can supply useful information on infrastructure impacts to the emergency managers during major disasters,but it is time consuming to filter through many irrelevant *** studies have identified the types of messages that can be found on social media during disasters,but few solutions have been proposed to efficiently extract useful *** present a framework that can be applied in a timely manner to provide disaster impact information sourced from social *** framework is tested on a well-studied and data-rich case of Hurricane *** procedures consist of filtering the raw Twitter data based on keywords,location,and tweet attributes,and then applying the latent Dirichlet allocation(LDA) to separate the tweets from the disaster affected area into categories(topics) useful to emergency *** LDA revealed that out of 24 topics found in the data,nine were directly related to disaster impacts-for example,outages,closures,flooded roads,and damaged *** such as frequent hashtags,mentions,URLs,and useful images were then extracted and *** relevant tweets,along with useful images,were correlated at the county level with flood depth,distributed disaster aid(damage),and population *** correlations were found between the nine relevant topics and population density but not flood depth and damage,suggesting that more research into the suitability of social media data for disaster impacts modeling is *** results from this study provide baseline information for such efforts in the future.

关键词： Disaster impacts Hurricane Harvey Infrastructure impacts Latent Dirichlet allocation(LDA) Social media analysis Twitter data

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Leader-following synchronization of a multi-agent system with heterogeneous delays

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Frontiers of Information Technology & Electronic Engineering 2021年第1期22卷 97-106页

作者： Branislav REHAK volodymyr LYNNYK The Czech Academy of Sciences Institute of Information Theory and AutomationPraha 18200Czech Republic

An algorithm is presen ted for leader-following synchronization of a multi-agen t system composed of linear agents with time *** presence of different delays in various agents can cause a synchronization error that does not converge to ***,the norm of this error can be bounded and this boundary is presen *** proof of the main results is formulated by means of linear matrix inequalities,and the size of this problem is independent of the number of *** are illustrated through examples,highlighting the fact that the steady error is caused by heterogeneous delays and demonstrating the capability of the proposed algorithm to achieve synchronization up to a certain error.

关键词： Multi-agent system Time delay Linear matrix inequality

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