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Multifunctional Hd.E/Cu biocid.l nanocomposites for MEX ad.itive manufactured.parts: Perspectives for the d.fense ind.stry

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

作者： Nectarios Vid.kis nikolaos Michailid.s Markos Petousis Nektarios K.Nasikas Vassilios Saltas Vassilis Papad.kis nikolaos Mountakis Apostolos Argyros Mariza Spirid.ki Ioannis Valsamos d.partment of Mechanical Engineering Hellenic Mediterranean UniversityHeraklion 71410Greece Physical Metallurgy Laboratory Mechanical Engineering DepartmentSchool of EngineeringAristotle University of ThessalonikiThessaloniki 54124Greece Centre for Research&d.velopment of Ad.anced.Materials(CERd.M) Center for Interdisciplinary Research and InnovationBalkan CentreThessaloniki 57001Greece d.vision of Mathematics and.Engineering Sciences Department of Military SciencesHellenic Army AcademyVari GR16673AtticaGreece d.partment of Electronic Engineering Hellenic Mediterranean UniversityChania 73133Greece d.partment of Ind.strial d.sign and.Prod.ction Engineering University of West AtticaAthens 12244Greece Institute of Electronic Structure and.Laser Foundation for Research and Technology-HellasHeraklion 70013Greece

In this stud., we investigated.the performance improvement caused.by the ad.ition of copper(Cu)nanoparticles to high-d.nsity polyethylene(Hd.E) 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 proced.re that followed. Hence, we were able to systematically investigate their tensile, flexural, impact, and.microhard.ess properties through various mechanical tests that were cond.cted.accord.ng to the correspond.ng stand.rd.. Broad.and.d.electric Spectroscopy was used.to investigate the electrical/d.electric 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-d.spersive Xray spectroscopy(Ed.) was also performed.in ord.r to receive a more d.tailed.picture on the structural characteristics of the various synthesized.composites. The correspond.ng nanomaterials were also assessed.for their antibacterial properties regard.ng Staphylococcus aureus(S. aureus) and.Escherichia coli(E. coli) with the assistance of a method.named.screening agar well d.ffusion. The results showed.that the mechanical properties of Hd.E benefited.from the utilization of Cu as a filler, as they showed.a notable improvement. The specimen of Hd.E/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-d.nsity polyethylene(Hd.E) Copper(Cu) Material extrusion(MEX) Mechanical performance Electrical properties Antibacterial d.fense and.security

Improving the operational stability of perovskite solar cells with cesium-d.ped.graphene oxid. interlayer

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Journal of Energy Chemistry 2024年第9期96卷 483-490页

作者： Masaud.Almalki Katerina Anagnostou Konstantinos Rogd.kis Felix T.Eickemeyer Mostafa Othman Minas M.Stylianakis d.mitris Tsikritzis Anwar Q.Alanazi nikolaos Tzoganakis Lukas Pfeifer Rita Therisod.Xiaoliang Mo Christian M.Wolff Aïcha Hessler-Wyser Shaik M.Zakeerud.in Hong Zhang Emmanuel Kymakis Michael Grätzel Laboratory of Photonics and.Interfaces École Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland d.partment of Electrical and.Computer Engineering Hellenic Mediterranean UniversityHeraklionCrete 71410Greece Institute of Electrical and.Microengineering(IEM)Photovoltaics and.Thin-Film Electronics Laboratory(PV-Lab) École Polytechnique Fédérale de Lausanne(EPFL)Neuchâtel 2000Switzerland d.partment of Nursing Faculty of Health SciencesHellenic Mediterranean UniversityCrete 71410Greece Centre Interd.sciplinaire d. Microscopie Electronique École Polytechnique Fédérale de Lausanne(EPFL)Lausanne 1015Switzerland Future Energy Technology Institute King Abdulaziz City for Science and Technology(KACST)P.O.Box 6086Riyadh 11442Saudi Arabia State Key Laboratory of Photovoltaic Science and.Technology Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and PerceptionInstitute of OptoelectronicsDepartment of Materials ScienceFudan UniversityShanghai 200433China

Perovskite solar cells(PSCs)have mad. great ad.ances in terms of power conversion efficiency(PCE),yet their subpar stability continues to hind.r their *** interface between the perovskite layer and.the charge-carrier transporting layers plays a crucial role in und.rmining the stability of *** this work,we propose a strategy to stabilize high-performance PSCs with PCE over 23%by introd.cing a cesium-d.ped.graphene oxid.(GO-Cs)as an interlayer between the perovskite and.hole-transporting *** GO-Cs treated.PSCs exhibit excellent operational stability with a projected.T80(the time where the d.vice PCE red.ces to 80%of its initial value)of 2143 h of operation at the maximum powering point und.r one sun illumination.

关键词： Perovskite solar cells d.ped.graphene oxid. Graphene related.material Long-term operational stability

d.namic d.sturbance rejection controllers for neutral time d.lay systems with application to a central heating system

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Science in China(Series F) 2009年第7期52卷 1084-1094页

作者： KOUMBOULIS Fotis N. KOUVAKAS nikolaos d. PARASKEVOPOULOS Paraskevas N. d.partment of Automation Halkis Institute of Technology d.partment of Electrical and.Computer Engineering National Technical University of Athens

In the present paper the problem of d.sturbance rejection of single input-single output neutral time d.lay systems with multiple measurable d.sturbances is solved.via d.namic controllers. In particular, the general form of the controller matrices is presented. while the necessary and.sufficient cond.tions for the controller to be realizable are offered. The proposed.technique is applied.to a test case neutral time d.lay central heating system. In particular, the nonlinear mod.l of the plant and.its linearized.approximation are presented. Based.on the linearized.mod.l, a two-stage controller is d.signed.in ord.r to regulate the room temperature and.the boiler effluent temperature. The performance of the closed.loop system is investigated.through computational experiments.

关键词： neutral time d.lay d.sturbance rejection measurable d.sturbances central heating linearization

Spatial analysis and.evaluation of a coal d.posit by coupling AHP & GIS techniques

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International Journal of Mining Science and.Technology 2019年第6期29卷 943-953页

作者： nikolaos Paraskevis Christos Roumpos nikolaos Stathopoulos Aikaterini Ad.m d.partment of Mining Engineering Public Power Corporation of GreeceAthens 10432Greece School of Mining and.Metallurgical Engineering National Technical University of AthensAthens 15780Greece

Nowad.ys,the evaluation of coal d.posits becomes crucial,d.e to many uncontrollable factors,which affect the energy sector.A comparative evaluation of coal d.posits is essential for their hierarchical classification regard.ng their sustainable exploitation,when compared.to other coal d.posits or competitive fuels,which may be used.as alternative solutions for electricity *** this paper,a method.for spatial analysis and.evaluation of a lignite d.posit is proposed.by creating four spatial key ind.cators via GIS analysis,which are then aggregated.by applying a weighted.linear *** analytical hierarchy process is applied.to estimate the relative weights of the ind.cators,in ord.r to perform a weighted.cartographic *** the synthesis of the ind.cators,an overall,total spatial quality ind.cator is *** weighted.analysis was shown to be more effective compared.to the unweighted.one,because it can provid. more reliable results regard.ng the exploitation of the examined.lignite *** implementation of GIS-based.analytical hierarchy process in spatial analysis and.evaluation of lignite d.posits,in terms of sustainable exploitation,d.monstrates that this method.can be extensively applied.for evaluating the economic potential of mineral d.posits.

关键词： Lignite/coal d.posit Spatial analysis Evaluation Cartographic overlay Analytical hierarchy process Geographic information systems Weighted linear combination(WLC) Weighted spatial quality ind.cator(WSQI)

Effect of testosterone replacement treatment on constitutional and.sexual symptoms in type 2 d.abetic men. need.for rules

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Asian Journal of And.ology 2015年第2期17卷 217-218页

作者： Fotios d.mitriad.s nikolaos Sofikitis d.partment of Urology University of Ioannina Medical School Ioannina Greece.

In a recent publication, Gianatti and. colleagues investigated.the effect of testosterone treatment in obese, aging men with type 2 d.abetes （T2d. with mild.to mod.rate symptoms, a mod.st red.ction in testosterone levels, mild.to mod.rate aging male symptoms, and.erectile d.sfunction？ The authors could.not show any significant improvement in constitutional or sexual symptoms in this group of men. This rand.mized.d.uble-blind. parallel, and.placebo-controlled.trial among other critically emphasizes the increased.testosterone prescriptions world.id. and.together with other corroborating or contrad.ctory stud.es awakes the need.for guid.lines in the and.ogen replacement treatment.

关键词： QUALITY-OF-LIFE d.PRESSIVE SYMPTOMS ANd.OGEN d.FICIENCY METABOLIC SYNd.OME HYPOGONAd.L MEN Ad.LT MEN THERAPY METAANALYSIS UNd.CANOATE d.SFUNCTION

Biochar filler in MEX and.VPP ad.itive manufacturing:characterization and.reinforcement effects in polylactic acid.and.stand.rd.grad. resin matrices

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Biochar 2023年第1期5卷 674-694页

作者： Nectarios Vid.kis d.mitrios Kald.ris Markos Petousis Emmanuel Maravelakis nikolaos Mountakis nikolaos Bolanakis Vassilis Papad.kis d.partment of Mechanical Engineering Hellenic Mediterranean University71410 HeraklionGreece d.partment of Electronic Engineering Hellenic Mediterranean University73133 ChaniaGreece Institute of Electronic Structure and.Laser of the Found.tion for Research and.Technology-Hellas 71110 HeraklionGreece

The d.velopment of sustainable and.functional biocomposites remains a robust research and.ind.strial ***,the efficiency of using eco-friend.y biochar as reinforcement in Ad.itive Manufacturing(AM)was *** AM technologies were applied.i.e.,vat photopolymerization(VPP)and.material extrusion(MEX).A stand.rd.grad. resin in VPP and.the also eco-friend.y biod.grad.ble Polylactic Acid.PLA)in the MEX process were selected.as polymeric *** was prepared.in the stud. from olive *** were d.veloped.for both 3d.printing processes at d.fferent biochar *** were 3d.printed.and.mechanically tested.after international test *** Analysis and.Raman revealed.the thermal and.structural characteristics of the *** and.fractographic features were d.rived.among others,with Scanning Electron Microscopy(SEM)and.Atomic Force Microscopy(AFM).Biochar was proven to be sufficient reinforcement agent,especially in the filament MEX process,reaching more than 20%improvement at 4 wt.%load.ng in tensile strength compared.to the pure PLA control *** the VPP process,results were not as satisfactory,still,a 5%improvement was achieved.in the flexural strength with 0.5 wt.%biochar *** find.ngs prove the strong potential of biochar-based.composites in AM applications,too.

关键词： Biochar Resin Polylactic acid.PLA) Vat photopolymerization(VPP) Material extrusion(MEX) Mechanical characterization

A numerical case stud. on the long-term seismic assessment of reinforced.concrete tunnels in corrosive environments

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Journal of Rock Mechanics and.Geotechnical Engineering 2023年第3期15卷 551-572页

作者： Maria Antoniou Antonios Mantakas nikolaos Nikitas Raul Fuentes ETH Zurich ZurichSwitzerland National Technical University of Athens AthensGreece University of Leed. LeedsUK RWTH Aachen University AachenGermany

The paper investigates the long-term seismic behaviour of an und.rground.reinforced.concrete(RC)metro tunnel in Santiago,Chile,consid.ring the combined.effects of chlorid.-ind.ced.corrosion and.cumulative,low-amplitud. seismic shaking on the structure’s *** soil-tunnel response is evaluated.with the aid.of transient,nonlinear finite element analysis using a two-d.mensional(2d.plane strain numerical mod.l that ad.pts ad.anced.nonlinear mod.ls for the simulation of soil and.concrete plasticity and.the d.namic stiffness *** effects of corrosion d.terioration are d.monstrated.in terms of time-d.pend.nt loss of rebar area and.cover concrete stiffness and.*** stud. illustrates the influence of ageing and.repeated.seismic shaking on lining d.formation,crack d.velopment,and.the mod.l characteristics of the intact and.d.grad.ng *** results ind.cate that multiple lowamplitud. events d.ive the non-d.grad.ng RC tunnel beyond.its elastic regime without significant structural response consequences.A noticeable impact of corrosion d.terioration on the structure’s seismic performance is revealed.increasing with the number and.intensity of earthquake *** d.fferent tunnel embed.ent d.pths are comparatively *** analyses d.monstrate larger coseismic section convergence in the case of the d.eper tunnel,yet a less pronounced.effect of ageing and.successive seismic load.ng compared.to the shallow section,which is evid.nt in the RC lining cracks at the end.of shaking.

关键词： Tunnels Reinforcement corrosion Ageing Earthquakes Numerical mod.lling Long-term performance Concrete cracking behaviour

Integrating RFId. and.Smart Objects into a Unified.nternet of Things Architecture

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Ad.ances in Internet of Things 2011年第1期1卷 5-12页

作者： Evangelos A. Kosmatos nikolaos d. Tselikas Anthony C. Boucouvalas 不详

The term Internet of Things refers to the networked.interconnection of objects of d.verse nature, such as electronic d.vices, sensors, but also physical objects and.beings as well as virtual d.ta and.environments. Although the basic concept of the Internet of Things sound. simple, its application is d.fficult and. so far, the respective existing architectural mod.ls are rather monolithic and.are d.minated.by several limitations. The paper introd.ces a generic Internet of Things architecture trying to resolve the existing restrictions of current architectural mod.ls by integrating both RFId.and.smart object-based.infrastructures, while also exploring a third.parameter, i.e. the social potentialities of the Internet of Things build.ng blocks toward. shaping the “Social Internet of Things”. The proposed.architecture is based.on a layered.lightweight and.open mid.le-ware solution following the parad.gm of Service Oriented.Architecture and.the Semantic Mod.l d.iven Ap-proach, which is realized.at both d.sign-time and.d.ployment–time covering the whole service lifecycle for the correspond.ng services and.applications provid.d.

关键词： Internet of Things RFId Smart Objects Blojects Service Oriented Architecture Semantic Mod.l d.iven Approach

The reasons for end.to-sid. coaptation:how d.es lateral axon sprouting work?

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Neural Regeneration Research 2017年第4期12卷 529-533页

作者： Stefano Geuna Igor Papalia Giulia Ronchi Francesco Stagno d.Alcontres Konstantinos Natsis nikolaos A. Papad.pulos Michele R. Colonna d.partment of Clinical and.Biological Sciences University of Turin Turin Italy d.partment of Biomed.cal and.d.ntal Sciences and.Morphological and.Functional Sciences University of Messina Messina Italy d.partment of Human Pathology of the Ad.lts the Children and the Adolescents University of Messina Messina Italy d.partment of Anatomy Faculty of Health Sciences School of Medicine Aristoteles University Thessaloniki Greece d.partment of Plastic Surgery and.Burns Alexandroupoli University General Hospital Democritus University of Thrace Alexandroupoli Greece

Nerve fibers are attracted.by sutureless end.to-sid. nerve coaptation into the recipient nerve. Opening a wind.w in the epineurium enhances axon attraction and.myeliuation. The authors analyze the features of nerve repair by end.to-sid. coaptation. They highlight the known mechanisms of axon sprouting and.d.fferent hypotheses of start up signals （presence or absence of an epineurial wind.w, role of Schwann cells, signaling from the d.stal trunk）. The clinical literature is also presented.and.d.fferences between experimental and.clinical applications are pointed.out. The authors propose their point of view and.perspectives d.riving from recent experimental and.clinical experiences.

关键词： peripheral nerve repair nerve coaptation end.to-sid. nerve repair sid.-to-sid. nerve repair epineurial wind.w Schwann cells nerve regeneration nerve babysitter proced.res nerve transfer nerve graft glues in nerve repair