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Multifunctional HDPE/Cu biocidal nanocomposites for MEX additive manufactured parts: Perspectives for the defense industry

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Defence Technology（防务技术） 2024年第8期38卷 16-32页

作者： Nectarios Vidakis Nikolaos Michailidis Markos Petousis Nektarios K.Nasikas Vassilios Saltas Vassilis Papadakis Nikolaos Mountakis apostolos argyros Mariza Spiridaki Ioannis Valsamos Department of Mechanical Engineering Hellenic Mediterranean UniversityHeraklion 71410Greece Physical Metallurgy Laboratory Mechanical Engineering DepartmentSchool of EngineeringAristotle University of ThessalonikiThessaloniki 54124Greece Centre for Research&Development of Advanced Materials(CERDAM) Center for Interdisciplinary Research and InnovationBalkan CentreThessaloniki 57001Greece Division of Mathematics and Engineering Sciences Department of Military SciencesHellenic Army AcademyVari GR16673AtticaGreece Department of Electronic Engineering Hellenic Mediterranean UniversityChania 73133Greece Department of Industrial Design and Production Engineering University of West AtticaAthens 12244Greece Institute of Electronic Structure and Laser Foundation for Research and Technology-HellasHeraklion 70013Greece

In this study, we investigated the performance improvement caused by the addition of copper(Cu)nanoparticles to high-density polyethylene(HDPE) matrix material. Composite materials, with filler percentages of 0.0, 2.0, 4.0, 6.0, 8.0, and 10.0 wt% were synthesized through the material extrusion(MEX)3D printing technique. The synthesized nanocomposite filaments were utilized for the manufacturing of specimens suitable for the experimental procedure that followed. Hence, we were able to systematically investigate their tensile, flexural, impact, and microhardness properties through various mechanical tests that were conducted according to the corresponding standards. Broadband Dielectric Spectroscopy was used to investigate the electrical/dielectric properties of the composites. Moreover, by employing means of Raman spectroscopy and thermogravimetric analysis(TGA) we were also able to further investigate their vibrational, structural, and thermal properties. Concomitantly, means of scanning electron microscopy(SEM), as well as atomic force microscopy(AFM), were used for the examination of the morphological and structural characteristics of the synthesized specimens, while energy-dispersive Xray spectroscopy(EDS) was also performed in order to receive a more detailed picture on the structural characteristics of the various synthesized composites. The corresponding nanomaterials were also assessed for their antibacterial properties regarding Staphylococcus aureus(S. aureus) and Escherichia coli(E. coli) with the assistance of a method named screening agar well diffusion. The results showed that the mechanical properties of HDPE benefited from the utilization of Cu as a filler, as they showed a notable improvement. The specimen of HDPE/Cu 4.0 wt% was the one that presented the highest levels of reinforcement in four out of the seven tested mechanical properties(for example, it exhibited a 36.7%improvement in the flexural strength, compared to the pure matrix). At the same

关键词： High-density polyethylene(HDPE) Copper(Cu) Material extrusion(MEX) Mechanical performance Electrical properties Antibacterial Defense and security

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Multifunctional HDPE/Cu biocidal nanocomposites for MEX additive manufactured parts: Perspectives for the defense industry

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Defence technology 2024年第8期 16页

作者： Nectarios Vidakis Nikolaos Michailidis Markos Petousis Nektarios K.Nasikas Vassilios Saltas Vassilis Papadakis Nikolaos Mountakis apostolos argyros Mariza Spiridaki Ioannis Valsamos

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On the Convergence of Broyden-Like Methods

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Acta Mathematica Sinica,English Series 2007年第11期23卷 2087-2096页

作者： Ioannis K.argyros Department of Mathematical Sciences Cameron UniversityLawtonOK 73505USA

The author provides a finer local as well as semilocM convergence analysis of a certain class of Broyden-like methods for solving equations containing a nondifferentiable term on the m-dimensional Euclidean space （m ... 详细信息

关键词： Broyden-like methods l2 norm Fréchet derivative radius of convergence local/semilocal convergence analysis

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Local Convergence for a Fifth Order Traub-Steffensen-Chebyshev-Like Composition Free of Derivatives in Banach Space

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Numerical Mathematics(Theory,Methods and Applications) 2018年第1期11卷 160-168页

作者： Ioannis K.argyros Santhosh George Department of Mathematical Sciences Cameron UniversityLawtonOK 73505USA Department of Mathematical and Computational Sciences NIT KarnatakaIndia 575025

We present the local convergence analysis of a fifth order Traub-Steffensen-Chebyshev-like composition for solving nonlinear equations in Banach *** earlier studies,hypotheses on the Fréchet derivative up to the fifth order of the operator un-der consideration is used to prove the convergence order of the method although only divided differences of order one appear in the *** restricts the applicability of the *** this paper,we extended the applicability of the fifth order Traub-Steffensen-Chebyshev-like composition without using hypotheses on the derivatives of the operator *** convergence conditions are weaker than the conditions used in earlier *** examples where earlier results cannot apply to solve equa-tions but our results can apply are also given in this study.

关键词： Traub-Steffensen-Chebyshev-like composition restricted convergence domain radius of convergence local convergence

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ITERATIVE REGULARIZATION METHODS FOR NONLINEAR ILL-POSED OPERATOR EQUATIONS WITH M-ACCRETIVE MAPPINGS IN BANACH SPACES

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Acta Mathematica Scientia 2015年第6期35卷 1318-1324页

作者： Ioannis K.argyros Santhosh GEORGE Department of Mathematical Sciences Cameron University Department of Mathematical and Computational Sciences National Institute of Technology Karnataka

In this paper, a modified Newton type iterative method is considered for ap- proximately solving ill-posed nonlinear operator equations involving m-accretive mappings in Banach space. Convergence rate of the method is obtained based on an a priori choice of the regularization parameter. Our analysis is not based on the sequential continuity of the normalized duality mapping.

关键词： nonlinear ill-posed equations iterative regularization m-accretive operator Newton type method

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Ferrimagnetic ceramic adsorbents for cleanup of H_2S from exhaust gases

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China Particuology 2007年第1期5卷 156-161页

作者： Bernd Halbedel apostolos Kontogeorgakos Institute of Materials Science Glass and Ceramic Technology Group Technische Universitt Ilmenau P.O. Box 10 05 65 D-98684 Ilmenau Germany NCSR "Demokritos" Institute of Materials Science 15310 Aghia Paraskevi Attiki Greece

Adsorbents that exhibit magnetic properties in addition to other required process-relevant characteristics open up new perspectives for the dry reduction and/or elimination of HES and other sulfur compounds from exhaust gases. These adsorbents eliminate the sulfur compounds from exhaust gases by virtue of their coatings and their magnetic property which makes it possible the use of magnetically assisted and stabilized fluidization in an externally applied magnetic field. In the present paper, the feasibility of the sorptive function of porous ceramic ferrimagnetic beads is ensured by sol-gel coating of zinc oxide without the formation of Zn-Fe-oxides and without considerable decrease of available pore volume. The results of material characterization by SEM, Auger electron spectroscopy, X-ray and mercury-porosity measurements and the loading capacity of a HES/N2 model gas are presented and discussed. The resulting HES loading of the functionalized adsorbent beads is more than 10 times larger than that of the starting material. @ 2007 Chinese Society of Particuolo^v and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V.

关键词： Adsorption Adsorbents Ferrites Magnetic materials Magnetic properties Sol-gel Zinc oxide

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Applications of biosensors for bacteria and virus detection in food and water–A systematic review

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Journal of Environmental Sciences 2022年第1期34卷 367-379页

作者： Zoi Kotsiri Jasmina Vidic apostolos Vantarakis Environmental and Microbiology Unit Department of Public HealthMedical SchoolUniversity of Patras 26504Greece INRAE Agro Paris TechMicalis InstituteUniversity of Paris-Saclay78350 Jouy-en-JosasFrance

Biosensors for sensitive and specific detection of foodborne and waterborne pathogens are particularly valued for their portability,usability,relatively low cost,and real-time or near real-time *** application is widespread in several domains,including environmental *** main limitation of currently developed biosensors is a lack of sensitivity and specificity in complex *** to increased interest in biosensor development,we conducted a systematic review,complying with the PRISMA guidelines,covering the period from January 2010 to December *** review is focused on biosensor applications in the identification of foodborne and waterborne microorganisms based on research articles identified in the Pubmed,Science Direct,and Scopus search *** are still in progress to overcome detection limitations and to provide a rapid detection system which will safeguard water and food *** use of biosensors is an essential tool with applicability in the evaluation and monitoring of the environment and food,with great impact in public health.

关键词： Biosensor Bacteria Viruses Food Water Lab on a chip

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On Newton’s Method for Solving Nonlinear Equations and Function Splitting

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Numerical Mathematics(Theory,Methods and Applications) 2011年第1期4卷 53-67页

作者： Ioannis K.argyros Saïd Hilout Cameron University Department of Mathematics SciencesLawtonOK 73505USA Universitéde Poitiers Laboratoire de Mathématiques et ApplicationsBd.Pierre et Marie CurieTéléport 2B.P.3017986962 Futuroscope Chasseneuil CedexFrance

We provided in[14]and[15]a semilocal convergence analysis for Newton’s method on a Banach space setting,by splitting the given *** this study,we improve the error bounds,order of convergence,and simplify the sufficie... 详细信息

关键词： Newton’s method Banach space majorizing sequence semilocal convergence splitting of an operator

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High-speed railway and safety: Insights from a bibliometric approach

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High-Speed Railway 2024年第3期2卷 187-196页

作者： apostolos Anagnostopoulos Department of Civil Engineering Aristotle University of ThessalonikiEgnatia St.Thessaloniki GR-54124Greece

High-Speed Rail(HSR)systems represent a significant advancement in modern *** offer rapid,efficient,and environmentally friendly alternatives to traditional rail,air travel and road *** if highspeed trains appeared approximately in the middle of the previous century,several aspects concerning safety *** study aims to comprehensively review the scientific literature related to the safety issues of high-speed railways.A bibliometric analysis was carried out utilizing 2358 publications from the last two decades(2004-2023)to understand better the existing research on HSR and *** trends and thematic areas of research are identified and *** researchers and universities have led the total number of current publications related to the context of HSR *** most of the publications come from Chinese institutions,a significant international collaboration can be *** main areas of research on HSR and safety can be classified into four main clusters based on the keywords co-occurrence analysis and are related to risk management,structural dynamics and resilience in railway systems,geotechnical engineering and tunnelling and maintenance *** and policymakers can use the results of this study to better understand the dynamics of scientific research in the field of highspeed railways and safety and make decisions about future directions and funding priorities.

关键词： High-speed rail Safety Literature review Bibliometric analysis VOSViewer

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Overview of boosting options for future downsized engines

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Science China(Technological Sciences) 2011年第2期54卷 318-331页

作者： RICARDO Martinez-Botas apostolos Pesiridis YANG MingYang Imperial College London Exhibition Road London SW7 2AZ UK Tsinghua University Beijing 100084 China

Driven by a demand for better fuel economy and increasingly stringent emissions regulations over a wide range of customers and applications,engine manufacturers have turned towards engine downsizing as the most potent enabler to meet these *** boosting systems becoming ever more numerous as the technical solutions to complex boosting requirements of the internal combustion engine increase,it is time for an overview of available and under development boosting technologies and systems and for a discussion of their relevance to downsizing *** presented analysis shows that there are no standard solutions for all the different applications as the trends indicate a rising complexity to meet with the extreme boosting requirements predicted for the remainder of the *** trends include variable geometry,a shift from single to two(or more)stages,extensive actuation for bypassing exhaust flows,exhaust flow regulation and pulsating exhaust energy recovery, severe electrification and an extensive effort downstream from the turbine to capture waste heat after the principal turbo- charger/supercharger system.

关键词： engine downsizing boosting technologies boosting system

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