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In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique

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Journal of Magnesium and Alloys 2024年第5期12卷 2024-2040页

作者： Jeno Gubicza Kristián Máthis Péter Nagy Péter Jenei Zoltán Hegedus Andrea Farkas jozef vesely Shin-ichi Inoue Daria Drozdenko Yoshihito Kawamura Department of Materials Physics Faculty of ScienceEotvos Loránd UniversityPázmány P.sétány 1/ABudapest H-1117Hungary Department of Physics of Materials Faculty of Mathematics and PhysicsCharles UniversityKe Karlovu 512116 Praha 2Czech Republic Deutsches Elektronen-Synchrotron DESY Notkestr.85Hamburg 22603Germany Magnesium Research Center Kumamoto University2-39-1 KurokamiChuo-kuKumamoto 860-8555Japan

Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application *** material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(LPSO)*** order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9%Zn-2.05%Y-0.15%Al(at%)*** uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 and 400℃ for 2 *** heat treatment at 300℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile *** the other hand,annealing at 400℃ resulted in a significant increase of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical *** maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10-25% was estimated to be about 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal types,what was also in agreement with the Schmid factor values revealed independently from orientation *** was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3% than above this value,which was explained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.

关键词： Mg-Zn-Y-Al alloy Long period stacking ordered(LPSO)phase Cluster arranged nanoplates(CANaPs) Annealing Tension Dislocation density Hardening

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Governance of decentralized autonomous organizations that produce open source software

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Blockchain(Research and Applications) 2024年第1期5卷 10-30页

作者： Paul van Vulpen jozef Siu Slinger Jansen Department of Information and Computer Science Utrecht University3584 CS Utrechtthe Netherlands Public Sector Solutions Centric2803 PB Goudathe Netherlands

Decentralized autonomous organizations(DAOs)have found use in the governance of open source software(OSS)***,the governance of an OSS producing DAO should match the particularities of OSS production while also overcoming the existing challenges of decentralized *** existing decentralized governance frameworks do not include all the governance activities of OSS ***,this study presents a governance framework for DAOs that produce *** framework is built upon a total of 34 articles on DAO and OSS *** framework was evaluated in three leading DAOs that produce *** evaluation underscores the significance of the framework and proves the potential of the systematic categorization of governance ***,we list emerging governance practices in various governance domains in this developing field.

关键词： Decentralized autonomous organizations Open source software Governance framework Blockchain Decentralized governance Case study research

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Energy and blast performance of beryllium in a model thermobaric composition in comparison with aluminum and magnesium

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Defence Technology（防务技术） 2024年第6期36卷 13-19页

作者： Thomas M.Klapotke Stanisław Cudziło Waldemar A.Trzcinski jozef Paszula Energetic Materials Research Department of ChemistryUniversity of Munich(LMU)Butenandtstrasse 5-13(D)81377MunichGermany Military University of Technology Faculty of Advanced Technologies and ChemistrySylwester Kaliski Str.200-908WarsawPoland

A direct comparison is made between the effectiveness of Al,Mg,and Be powders as additional fuels in model thermobaric compositions containing 20%fuel,20%ammonium perchlorate,and 60%RDX(1,3,5-Trinitro-1,3,5-triazacyclohexane)passivated with *** determined calorimetric measurements of the heat of detonation,along with the overpressure histories in an explosion chamber filled with nitrogen,were used to determine the quasi-static pressure(QSP)under anaerobic *** measurements were also performed in a semi-closed bunker,and all blast wave parameters generated after the detonation of 500 g charges of the tested explosives were *** calorimetry results,QSP values,and blast wave parameters(pressure amplitude,specific and total impulses)clearly indicate that Be is much more effective as an additional fuel than either Al or Mg in both anaerobic post-detonation reactions as well as the subsequent aerobic *** heat of detonation of the RDXwax/AP/Be explosive mixture is over 40%and 50%higher than that of the mixture containing aluminum and magnesium instead of beryllium,***,the TNT equivalent of the Be-containing composition due to the overpressure in the nitrogen-filled explosion chamber is 1.66,while the equivalent calculated using an air shock wave-specific impulse at a distance of 2.5 m is equal to *** high values of these parameters confirm the high reactivity of beryllium in both the anaerobic and aerobic stages of the thermobaric explosion.

关键词： Thermobaric explosives Beryllium Heat of detonation Quasi-static overpressure Blast wave parameters

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Synthesis and crystal structure study of 2′-Se-adenosine-derivatized DNA

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Science China Chemistry 2010年第1期53卷 78-85页

作者： SALON jozef Department of Chemistry Georgia State University

The selenium derivatization of nucleic acids is a novel and promising strategy for 3D structure determination of nucleic *** can serve as an excellent anomalous scattering center to solve the phase problem,which is one of the two major bottlenecks in macromolecule X-ray *** other major bottleneck is *** has been demonstrated that the incorporated selenium functionality at the 2′-positions of the nucleosides and nucleotides is stable and does not cause significant structure ***,it was observed that the 2′-Se-derivatization could facilitate crystallization of oligonucleotides with fast crystal growth and high diffraction ***,we describe a convenient synthesis of the 2′-Se-adenosine phosphoramidite,and report the first synthesis and X-ray crystal structure determination of the DNA containing the 2′-Se-A *** 3D structure of 2′-Se-A-DNA decamer 5′-GTACGCGT(2′-Se-A)C-3′2 was determined at 1.75 ? resolution,the 2′-Se-functionality points to the minor groove,and the Se-modified and native structures are virtually ***,we have observed that the 2′-Se-A modification can greatly facilitate the crystal growth with high diffraction *** conjunction with the crystallization facilitation by the 2′-Se-U and 2′-Se-T,this novel observation on the 2′-Se-A functionality suggests that the 2′-Se moiety is sole responsible for the crystallization facilitation and the identity of nucleobases does not influence the crystal growth significantly.

关键词： selenium derivatization nucleic acid adenosine X-ray crystallography structure determination

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Basic theorem as representation of heterogeneous concept lattices

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Frontiers of Computer Science 2015年第4期9卷 636-642页

作者： jozef POCS Jana POCSOVA Palacky University Olomouc Department of Algebra and Geometry Olomouc 779 00 Czech Republic Mathematical Institute Slovak Academy of Sciences Kosice 040 01 Slovakia Technical University of Kosice BERG Faculty Institute of Control and Informatization of Production Processes Ko~ice 043 84 Slovakia

We propose a method for representing heteroge- neous concept lattices as classical concept lattices. Particu- larly, we describe a transformation of heterogeneous formal context into a binary one, such that corresponding concept lattices will be isomorphic. We prove the correctness of this transformation by the basic theorem for heterogeneous as well as classical concept lattices.

关键词： basic theorem heterogeneous concept lattice,representation

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Corrosion Resistance of AZ91 Magnesium Alloy after Laser Remelting Treatment

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Journal of Wuhan University of Technology(Materials Science) 2016年第5期31卷 1075-1080页

作者： STRZELECKA Monika IWASZKO jozef MALIK Marcin A Czestochowa University of Technology 42-200 Czestochowa Poland

The main objective of the study was the modification of the surface layer of magnesium alloy by the COlaser. The studied material was the commercial AZ91 magnesium alloy. The effectiveness of the alternations caused by the remelting process was verified on the basis of microscopic observation and corrosion investigations, i e, recording of potentiodynamic polarization curves, electrochemical noise measurements and hydrogen evolution rate measurements. For the adopted range of the treatment parameters, favourable changes were observed in the surface layer such as the refinement of structure and more uniform arrangement of individual phases. As a consequence of those favourable structural changes the improvement of the corrosion resistance of the alloy was achieved in comparison to its non-remelted equivalent. For the treated material corrosion rates expressed as corrosion current densities were at least three times lower than the appropriate values for the untreated alloy comparing them for the same period of samples immersion in the test solution. The obtained results have confirmed the effectiveness of the applied surface treatment resulting in favourable changes in the structure and corrosion properties of the AZ91 magnesium alloy.

关键词： magnesium alloy CO_2 laser surface layer modification corrosion

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Impact of Informatics on QIPC

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南京邮电大学学报（自然科学版） 2011年第2期31卷 40-48页

作者： jozef Gruska Faculty of Informatics Masaryk University Botanická 68a

Quantum information processing and communication(QIPC) is an area of science that has two main goals: On one side,it tries to explore(still not well known) potential of quantum phenomena for(efficient and reliable) information processing and(efficient,reliable and secure) *** the other side,it tries to use quantum information storing,processing and transmitting paradigms,principles,laws,limitations,concepts,models and tools to get deeper insights into the phenomena of quantum world and to find efficient ways to describe and handle/simulate various complex physical *** order to do that QIPC has to use concepts,models,theories,methods and tools of both physics and *** main role of physics at that is to discover primitive physical phenomena that can be used to design and maintain complex and reliable information storing,processing and transmitting *** main role of informatics is,one one side,to explore,from the information processing and communication point of view,limitations and potentials of the potential quantum information processing and communication technology,and to prepare information processing methods that could utilise potential of quantum information processing and communication *** the other side,the main role of informatics is to guide and support,by theoretical tools and outcomes,physics oriented research in *** paper is to describe and analyse a variety of ways and potential informatics contributes and should/could contribute to the development of QIPC--see also Gruska(1999,2006,2008).

关键词： Informatics quantum complexity theory quantum cryptography quantum algorithm

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Heavy Metal Adsorption Properties of Marine Algae Durvilliea Potatorum,Ecklonia Radiata and Laminaria Japonica

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Chinese Journal of Chemical Engineering 1998年第1期6卷 72-76页

作者：虞启明 Jose T.Matheickal jozef Latten School of Environmental Engineering Griffith University

1 INTRODUCTIONBiosorption of heavy metals using biosorbents derived from suitable biomass is a new tech-nology for the removal and recovery of heavy metals from industrial waste *** ad-vantages of the biosorption technology include rapid reduction of dissolved heavy metal ionsconcentration to 10-6and 10-9levels,use of inexpensive and non-hazardous biosorbents,useof existing adsorption process equipment and therefore low operating costs,high uptake ca-pacity and specificity for selective heavy metal removals,and low interference from

关键词： biosorption heavy metal removal marine algae

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Verification of Cutting Zone Machinability during Drilling of Austenitic Stainless Steels

Verification of Cutting Zone Machinability during Drilling o...

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International Conference on Experimental Mechanics 2008 (ICEM 2008)

作者： jozef Jurko Department of Production Technology Faculty of Production TechnologyTechnical University of KoicePreovSlovakia

＜正＞Automated production of,in the sense of,machine production has characteristic features:a reduction of production costs,stimulation of the development of cutting tools,and changes in the construction of machine t... 详细信息

关键词： drilling cutting process screw drill fracture fatigue stainless steels

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Uncovering the Genetic Networks Driving Stomatal Lineage Development

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Molecular Plant 2020年第10期13卷 1355-1357页

作者： Despina Samakovli George Komis jozef(S)amaj Centre of the Region Hanáfor Biotechnological and Agricultural Research Faculty of SciencePalack(y)University Olomouc(S)lechtitel(u)2778371 OlomoucCzech Republic

Recent studies on stomatal ontogenesis and function provided important insights into plasticity strategies that plants employ to optimize their development by balancing their requirements for carbon and water under diverse environmental *** on stomata progressed from physiological and cell biological approaches for the identification of important regulatory genes by genetic tools to recent isolation of stomatal guard cells by different techniques in order to analyze their transcriptomic and proteomic ***,development of the stomatal lineage appeared as an appealing model to study cell identity,division,and morphology pattems in plants.

关键词： insight covering balancing

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