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Structure-activity relationship in water-gas shift reaction over gold catalysts supported on Y-doped ceria

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Journal of Rare Earths 2019年第4期37卷 383-392页

作者： Tatyana Tabakova Lyuba ilieva Ivan Ivanov Maela Manzoli Rodolfo Zanella Petya Petrova Zbigniew Kaszkur Institute of Catalysis Bulgarian Academy of Sciences Department of Drug Science and Technology & Centre for Nanostructured Interfaces and Surfaces University of Turin Centro de Ciencias Aplicadas y Desarrollo Tecnologico Universidad Nacional Autonoma de Mexico Institute of Physical Chemistry PAS

The utilization of pure hydrogen as an energy source in fuel cells gave rise to renewed interest in developing active and stable water-gas shift catalysts. Gold catalysts have proven to be very efficient for water-gas shift reaction at low temperature. The aim of the present study was to investigate the effect of:(i) different preparation methods(impregnation and coprecipitation) to obtain a modified ceria support,and(ii) the amount of Y_2 O_3(1.0 wt%, 2.5 wt%, 5.0 wt% and 7.5 wt%) as dopant on the water-gas shift activity of Au/CeO_2 catalysts. An extended characterization by means of S_(BET), XRD, HRTEM/HAADF, FTIR,H_2-TPR and CO-TPR measurements in combination with careful evaluation of the catalyst behavior allowed to shed light on the parameters governing the water-gas shift activity. The catalysts show very high activity(>90% CO conversion) in the temperature range 180-220 ℃,with a slightly better performance of the gold catalysts on supports prepared by impregnation. The decreased activity with increasing Y_2 O_3 concentration is related to the hindering of oxygen mobility due to ordering of surface oxygen vacancies in vicinity of segregated Y^(3+). The effect of catalyst pre-treatments and the stability of the best performing samples were examined as well.

关键词： Gold catalyst Water gas shift reaction Doped ceria Yttrium Hydrogen production Rare earths

Study on spiral winding swimming motion control of a slender legless creature model

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High Technology Letters 2021年第4期27卷 415-421页

作者： Lu Zhenli Ma Zhipeng Marko Pencic Maja Cavic Borovac Branislav Roumiana ilieva Bojan Nemec Marjan Mernik School of Electrical Engineering and Automation Changshu Institute of TechnologyChangshu 215500P.R.China School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116P.R.China Faculty of Technical Sciences University of Novi SadNovi Sad 621000Serbia Faculty of Management Technical University of SofiaSofia 1000Bulgaria Department of Automatics Biocybernetics and RoboticsJožef Stefan InstituteLjubljana 1000Slovenia Faculty of Electrical Engineering and Computer Science University of MariborMaribor 462000Slovenia

Through the observation and analysis of the motion trajectory of spiral winding motion for slender legless biological creatures in water,V-REP software is adopted to build a dynamic simulator to study on the mechanism of spiral winding swimming(SWS)*** using the output of spiral function(SF),the dynamic simulation model of slender legless creature(SLC)realizes the SWS motion in *** corresponding experiments under the control of different bending angle of SF to control the dynamic model are also carried out to analyze the water performance of SWS in still *** with the output of two different bending angles of the spiral function,the dynamic model can be used to realize SWS and up/down *** work provides technical reserve and experimental platform for the corresponding study in related fields.

关键词： V-REP spiral winding swimming(SWS) motion control slender legless creature(SLC)

Blockchain for Solid Waste Trading

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Management Studies 2023年第2期11卷 53-64页

作者： Mila ilieva-Obretenova University of Mining and Geology SofiaBulgaria

A green economy is an economy that aims to reduce environmental risks and ecological scarcities,and that lines up sustainable development without degrading the *** can be solid,liquid,or gas and each type has different methods of disposal and *** the common principles of management are efficiency and fairness,Blockchain as a peer-to-peer concept with a consensus mechanism is suitable for waste *** paper presents the first stage of project“Blockchain in solid waste management”.From several points of view a review of solid waste management is performed,in which the blockchain has the major role:(1)problem definition and possible solutions;(2)Blockchain applications in solid waste management;(3)blockchain applications for different solid waste types;(4)blockchain elements for waste management;(5)blockchain in cooperation with other *** author syntheses advanced sorting process,models of Blockchain in solid waste trading,and three use cases with selected *** used design methodology is unified modelling language:activity diagrams and communication *** author applies the principles of supply and *** models are intended for business developers,university professors,and students.

关键词： green economy solid waste waste management blockchain waste trading

Drone Management in Underground Mine Workings

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Journal of Mechanics Engineering and Automation 2021年第6期11卷 171-179页

作者： Mila ilieva-Obretenova Department of Electrical Engineering University of Mining and GeologySofiaStudents City 1700Bulgaria

Mine workings inspection is a specific activity,which could be accomplished with a *** the disadvantages of the method-expensive,financial and by time,limiting size of used sensors,the system boring one single hole saves time and *** management of Ground Station,introducing DM(Deployment Mechanism)and Drone is necessary for underground process monitoring on the *** author has surveyed till now the basic topics about design of encased drone for security from harsh *** article is a part of project investigation and management of microclimate sensors for underground *** and their management as an eventual bearer system for sensors are *** of Ground Station is proposed at this first *** aspects are considered:Installation,Configuration and Power Supply as Management *** classes MO(Managed Objects)and inheriting classes MO are *** models are designed for user interface developers,university lecturers and students.

关键词： Mine workings drone management ground station DM

Blockchain Management in Smart Grid

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Management Studies 2021年第4期9卷 280-288页

作者： Mila ilieva-Obretenova University of Mining and Geology SofiaBulgaria

Power Supply and Smart Grid represent specific business,which must be managed by permissioned(private)*** its disadvantages-time consuming,expensive,and losing from network effect-the permissioned blockchain offers balance,guarantees stability,and provides physical limitations for usage of validating nodes only in the *** management of permissioned blockchain is necessary for tracing the processes in *** author has represented the moment following topics:the idea for applying blockchain in business environment,blockchain technology-as a linked list with a new key on each step,node structure and information models for node management with a large granularity,detail models for node management with accent on configuration and performance and managed objects classes for installation of blockchain network with accent on security and performance,models for blockchain network management and five scenarios for blockchain transactions *** paper represents a stage of project Blockchain in Smart Grid:describing of Managed Objects classes for functional areas of blockchain life cycle:Provision,Configuration,Maintenance,Security(developed),Accounting,Performance,and Subscriber *** author uses the life cycle of telecommunications networks as a *** models are designed for user interface developers,university professors,and students.

关键词： power supply smart grid permissioned(private)blockchain network effect validating nodes

Blockchain in Smart Grid for Sustainable Management of Environmental Resources Usage

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Management Studies 2022年第5期10卷 275-283页

作者： Mila ilieva-Obretenova Department Automation of Production Systems of the University of Mining and Geology“St.Ivan Rilski” SofiaBulgaria

Blockchain is a distributed database that is shared among the nodes of a computer *** have certain storage capacity and,when filled,they are closed,and linked to the previously filled block,forming a *** are typically managed by a peer-to-peer method where nodes collectively adhere to a consensus algorithm protocol to add and validate new transaction *** author makes a review of Blockchain applications in different areas,considerable challenges,her own experience with Blockchain in Smart Grid and other researchers`*** paper presents the first stage of project“Smart Grid for Sustainable Management of Environmental Resources Usage”-describing Managed Objects classes for selected functional areas of Blockchain life cycle:Configuration,Security,and *** author uses the life cycle of telecommunication networks as a *** models are designed for user interface developers,university professors,and students.

关键词： Blockchain Smart Grid Sustainable Management environmental resources

Elapidae Snake BitesmBiophysical Aspects of the Neuroparalytic Envenomation

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Journal of Pharmacy and Pharmacology 2016年第12期4卷 715-720页

作者： Yuliyan Naydenov Teodora Karachorova Detelina ilieva Department of Medicine Medical University of Varna Varna 9002 Bulgaria Department of Medical Physics and Biophysics Faculty of Pharmacy Medical University of Varna Varna 9002 Bulgaria

Snakebite is classified by the WHO （World Health Organization） as a neglected tropical disease, envenoming in a significant public health problem in tropical and subtropical regions. Neurotoxicity is a key feature of different types of envenomations and there are many unanswered questions regarding this manifestation. Acute neuromuscular weakness with respiratory involvement is the most clinically important neurotoxic effect. We present how the neuroparalytic poison affects the human body and what actually happens when the poison is injected into the human body. Neuroparalytic poisons are one of the most lethal, because they cause paralysis of the eye, throat and chest muscles. A well-known member of the Elapidae family is the cobra. Bungarotoxins are a group of closely related neurotoxin proteins. The α-bungarotoxin inhibits the binding of acetylcholine （ACh） to nicotinic acetylcholine receptors; β-bungarotoxin and T-bungarotoxins act presynaptically causing excessive acetylcholine release and subsequent depletion.

关键词： Elapidae action potential neuromuscular synapse poison bungarotoxin paralysis.

IoT Management for Street Lighting-Information Model-Part II

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Management Studies 2023年第5期11卷 253-261页

作者： Mila ilieva-Obretenova Radi Pipev University of Mining and Geology SofiaBulgaria “Sofia-Project”Municipal Company SofiaBulgaria

Design is a concept of either an object,a process,or a system that is specific and,in most cases,detailed.A service design is designing or organizing the experience around a product and the service associated with a product’s *** this purpose,service design uses methods and tools derived from different disciplines like information and management *** second level of management science is about building models and implementing models on *** paper presents the second stage of project“Service management for IoT in streetlighting”.From several points of view a review of streetlighting management is performed:(1)design and spending;(2)network element management;(3)network management;(4)new technologies in smart *** authors synthesize main objects classes for service management and specialized managed objects classes for two areas-Service Provision and Officer *** used design methodology is unified modelling language(UML)and particularly class *** models are intended for business developers,university professors,and students.

关键词： service management IoT smart streetlighting managed objects classes UML

IoT for Streetlighting-Requirements for Modelling of Management Services-Part I

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Management Studies 2023年第5期11卷 245-252页

作者： Mila ilieva-Obretenova Radi Pipev University of Mining and Geology SofiaBulgaria “Sofia-Project”Municipal Company SofiaBulgaria

Energy conservation is the effort to reduce the overconsumption of energy by the usage of less energy *** conservation could be user oriented or industry sector *** of these sectors is the streetlighting-major energy consumer in the town-forming nearly 30%of each country’s *** designed management of streetlighting not only reduces the energy consumption of the town,but also increases the public safety and the *** article focuses the management of IoT for streetlighting in smart *** is the first stage of project“Service management for IoT in streetlighting”.While the basic management principles are efficiency and fairness,the requirements of all actors must be *** the base of requirements,the authors synthesize the management functions with selected *** chosen methodology is unified modelling language(UML):use case *** models are intended to business developers,university professors,and students.

关键词： streetlighting IoT requirements management system UML