检索结果-南通市图书馆

Critical quality indicators of high-performance polyetherimide(ULTEM)over the MEX 3D printing key generic control parameters:Prospects for personalized equipment in the defense industry

在线全文

学校读者我要写书评

暂无评论

Defence Technology(防务技术) 2025年第1期43卷 150-167页

作者： Nectarios Vidakis Markos Petousis Constantine David nektarios K.Nasikas Dimitrios Sagris Nikolaos Mountakis Mariza Spiridaki Amalia Moutsopoulou Emmanuel Stratakis Dept.of Mechanical Engineering Hellenic Mediterranean UniversityHeraklion 71410Greece Dept.of Mechanical Engineering International Hellenic UniversitySerres Campus 62124Greece Division of Mathematics and Engineering Sciences Department of Military SciencesHellenic Army AcademyGR 16673VariAtticaGreece Institute of Electronic Structure and Laser(IESL) Foundation for Research and Technology(FORTH)N.Plastira 100Vassilika Vouton 70013HeraklionCreteGreece Qingdao Innovation and Development Center Harbin Engineering UniversityQingdao 266000China

Additive Manufacturing(AM)can provide customized parts that conventional techniques fail to *** important parameter in AM is the quality of the parts,as a result of the material extrusion 3D printing(3D-P)*** can be very important in defense-related applications,where optimum performance needs to be *** quality of the Polyetherimide 3D-P specimens was examined by considering six control parameters,namely,infill percentage,layer height,deposition angle,travel speed,nozzle,and bed *** quality indicators were the root mean square(Rq)and average(Ra)roughness,porosity,and the actual to nominal dimensional *** examination was performed with optical profilometry,optical microscopy,and micro-computed tomography *** Taguchi design of experiments was applied,with twenty-five runs,five levels for each control parameter,on five *** additional confirmation runs were conducted,to ensure *** equations were constructed to express the quality indicators in terms of the control *** modeling approaches were applied to the experimental data,to compare their efficiency,i.e.,Linear Regression Model(LRM),Reduced Quadratic Regression Model,and Quadratic Regression Model(QRM).QRM was the most accurate one,still the differences were not high even considering the simpler LRM model.

关键词： Polyetherimide(PEI) Material extrusion(MEX) Three-dimensional printing(3D-P) Critical quality indicators(CQIs) Quadratic regression model(QRM) Taguchi

Enhanced engineering and biocidal polypropylene filaments enabling melt reduction of AgNO_(3) through PVP agent:A scalable process for the defense industry with MEX additive manufacturing

在线全文

学校读者我要写书评

暂无评论

Defence Technology(防务技术) 2025年第2期44卷 52-66页

作者： Markos Petousis Nikolaos Michailidis Vassilis Papadakis Apostolos Argyros Mariza Spiridaki Nikolaos Mountakis John Valsamos nektarios K.Nasikas Amalia Moutsopoulou Nectarios Vidakis 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) Centre for Interdisciplinary Research and InnovationBalkan CentreBuilding B’10th Km Thessaloniki-Thermi RoadThessaloniki 57001Greece Institute of Electronic Structure and Laser of the Foundation for Research and Technology-Hellas(IESL-FORTH)e Hellas N.Plastira 100mHeraklion 70013Greece Department of Industrial Design and Production Engineering University of West AtticaAthens 12243Greece Division of Mathematics and Engineering Sciences Department of Military SciencesHellenic Army AcademyGR 16673VariAtticaGreece

This study focused on the production of polypropylene(PP)/silver(Ag)composites via additive *** study aimed to enhance the quality of medical-grade PP in material extrusion(MEX)three-dimensional printing(3DP)by improving its mechanical properties while simultaneously adding antibacterial *** latter can find extremely important and versatile properties that are applicable in defense and security ***/Ag nanocomposites were prepared using a novel method based on a reaction occurring while mixing appropriate quantities of the starting polymers and additives,namely polyvinylpyrrolidone(PVP)as the matrix material and silver nitrate(AgNO_(3))as the *** process produced three-dimensional(3D)printed filaments,which were then used to create specimens for a series of standardized *** was found that the mechanical properties of the nanocomposites were enhanced in relation to pristine PP,especially for the PP matrix with various loadings of AgNO_(3)and PVP,such as 5.0 wt%and 2.5 wt%,*** voids,inclusions,and actual-to-nominal dimensions also showed improved *** 3DP specimens exhibited a more effective biocidal performance against Staphylococcus aureus than Escherichia coli,which developed an inhibition zone only in the case of PP with filler loading percentages of AgNO_(3)and PVP at 10.0 wt%and 5.0 wt%,respectively Compounds possessing such properties can be beneficial for various applications requiring increased mechanical properties and biocidal capabilities,such as in the Defence or medical industries.

关键词： Polypropylene(PP) Polyvinyl pyrrolidone(PVP) Silver nitride(AgNO_(3)) In-situ reactive melt mixing process Material extrusion(MEX)3D printing Biocidal performance

Innovative education and training in high power laser plasmas(PowerLaPs) for plasma physics, high power laser matter interactions and high energy density physics: experimental diagnostics and simulations

在线全文

学校读者我要写书评

暂无评论

High Power Laser Science and Engineering 2020年第1期8卷 30-36页

作者： John Pasley Georgia Andrianaki Andreas Baroutsos Dimitri Batani Emmanouil PBenis Andrea Ciardi Donna Cook Vasilios Dimitriou Brendan Dromey Ioannis Fitilis Giancarlo Gatti Anastasios Grigoriadis Marine Huault Jose Antonio Pérez Hernández Evaggelos Kaselouris Ondrej Klimo Michel Koenig George Koundourakis Milan Kucharik Jiri Limpouch Richard Liska Carlos Salgado Lopez Sophia Malko Susana Olmos-Miguelanez Yannis Orphanos Valeria Ospina nektarios apapadogiannis Stelios Petrakis Jan Psikal Maria Serena Rivetta Maria-ose Rodriguez-Conde Joao Jorge Santos Milan Sinor Alexandros Skoulakis Ioannis Tazes Laura Tejada Pascual Calliope Tsitou Pavel Vachal Luca Volpe Jiri Vyskocil Steven White Mark Yeung Ghassan Zerouli Michael Tatarakis York Plasma Institute University of YorkHeslingtonYork YO105DQUK Hellenic Mediterranean University Institute of Plasma Physics and Lasers-IPPL74100 Rethymnon73133 ChaniaCreteGreece University of Bordeaux CNRSCEACELIA(Centre Lasers Intenses et Applications)UMR 5107F-33405 TalenceFrance Department of Physics University of IoanninaGR 45110 IoanninaGreece LULI-CNRS CEASorbonne UniversiesEcole PolytechniqueInstitut Polytechnique de Paris-F-91128 Palaiseau CedexFrance Observatoire de Paris 5 Place J JanssenMeudon 92195France Centre for Plasma Physics School of Mathematics and PhysicsQueen’s University BelfastBelfast BT71NNUK Centro de Láseres Pulsados(CLPU) Edificio M5Parque CientficoC/Adaja 837185 VillamayorSalamancaSpain University of Salamanca 37008 SalamancaSpain Faculty of Nuclear Sciences and Physical Engineering Czech Technical University in PragueBrehova 711519Prague 1Czech Republic University Institute for Educational Sciences University of Salamanca37008 SalamancaSpain Group of Research“Interaction and e Learning”(GRIAL) University of Salamanca37008 SalamancaSpain CLPU Laser-Plasma Chair at University of Salamanca 37008 SalamancaSpain

The second and final year of the Erasmus Plus programme’Innovative Education and Training in high power laser plasmas’,otherwise known as PowerLaPs,is *** PowerLaPs programme employs an innovative paradigm in that it is a multi-centre programme,where teaching takes place in five separate institutes with a range of different aims and styles of ***’in-class’time is limited to 4 weeks a year,and the programme spans 2 *** aims to train students from across Europe in theoretical,applied and laboratory skills relevant to the pursuit of research in laser plasma interaction physics and inertial confinement *** are intermingled with laboratory sessions and continuous assessment *** programme,which is led by workers from the Hellenic Mediterranean University and supported by co-workers from the Queen’s University Belfast,the University of Bordeaux,the Czech Technical University in Prague,Ecole Polytechnique,the University of Ioannina,the University of Salamanca and the University of York,has just finished its second and final *** Learning Teaching Training activities have been held at the Queen’s University Belfast,the University of Bordeaux,the Czech Technical University,the University of Salamanca and the Institute of Plasma Physics and Lasers of the Hellenic Mediterranean *** last of these institutes hosted two 2-week-long Intensive Programmes,while the activities at the other four universities were each 5 days in *** addition,a’Multiplier Event’was held at the University of Ioannina,which will be briefly *** this second year,the work has concentrated on training in both experimental diagnostics and simulation techniques appropriate to the study of plasma physics,high power laser matter interactions and high energy density *** nature of the programme will be described in detail,and some metrics relating to the activities carried out will be *** particular,this paper will f

关键词： laser plasma interactions postgraduate education

Neighborhood environment,physical activity,and quality of life in adults:Intermediary effects of personal and psychosocial factors

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2017年第1期6卷 96-102页

作者： Eleni Theodoropoulou nektarios A.M.Stavrou Konstantinos Karteroliotis School of Physical Education and Sport Science National and Kapodistrian University of AthensAthens 17237Greece

Background: Studies have indicated that there is a positive and indirect relationship between physical activity(PA) and quality of life(QoL). The current study examined this relationship through a social cognitive model with consideration to the intermediary effects of exercise self-efficacy,and physical(PCS, physical component summary) and psychological(MCS, mental component summary) health. Additionally, this model was widened to include concepts from the ecological theory, and any causal associations among neighborhood environment, PA, and ***: Six hundred and eighty-four physically active adults(39.16 ± 13.52 years, mean ± SD), living in Athens, Greece, completed a series of questionnaires measuring PA, QoL, exercise self-efficacy, PCS, MCS, neighborhood environment, and family and friend support for PA. The examined models were analyzed using structural equation ***: The social cognitive and ecological models proved to be of appropriate fit. Within the social cognitive model, PA positively affected QoL through the mediating effects of exercise self-efficacy, PCS, and MCS. With regards to the ecological model, neighborhood environment positively influenced QoL through the intermediary effects of family support for PA, exercise self-efficacy, PA, PCS, and ***: Results indicated that the most important mediators in the examined models were exercise self-efficacy and health. Further, findings demonstrated the role of neighborhood environment in enhancing PA and QoL. Future studies should be carried out applying longitudinal data for a better understanding of these associations over time.

关键词： Cognitive Ecological Health Self-efficacy Structural equation modeling

Training on LSA lifeboat operation using Mixed Reality

在线全文

学校读者我要写书评

暂无评论

Virtual Reality & Intelligent Hardware 2023年第3期5卷 201-212页

作者： Spyridon nektarios BOLIERAKIS Margarita KOSTOVASILI Lazaros KARAGIANNIDIS Angelos AMDITIS I-SENSE Group National Technical University of Athens(NTUA)Zografou 15773Greece

Background This work aims to provide an overview of the Mixed Reality(MR)technology’s use in maritime industry for training *** training procedures cover a broad range of procedural operations for Life-Saving Appliances(LSA)lifeboats;however,several gaps and limitations have been identified related to the practical training that can be addressed through the use of ***,Virtual and Mixed Reality applications are already used in various fields in maritime industry,but their full potential have not been yet *** project aims to exploit MR advantages in the maritime training by introducing a relevant application focusing on use and maintenance of LSA *** An MR Training application is proposed supporting the training of crew members in equipment usage and operation,as well as in maintenance activities and *** application consists of the training tool that trains crew members on handling lifeboats,the training evaluation tool that allows trainers to assess the performance of trainees,and the maintenance tool that supports crew members to perform maintenance activities and procedures on *** each tool,an indicative session and scenario workflow are implemented,along with the main supported interactions of the trainee with the *** The application has been tested and validated both in lab environment and using a real LSA lifeboat,resulting to improved experience for the users that provided feedback and recommendations for further *** application has also been demonstrated onboard a cruise ship,showcasing the supported functionalities to relevant stakeholders that recognized the added value of the application and suggested potential future exploitation *** The MR Training application has been evaluated as very promising in providing a user-friendly training environment that can support crew members in LSA lifeboat operation and maintenance,while it is still subject to

关键词： Augmented Reality Mixed Reality Maritime training Cruise industry Lifeboat operation Lifeboat maintenance H2020 research project

Lensless fiber endomicroscopy in biomedicine

在线全文

学校读者我要写书评

暂无评论

PhotoniX 2024年第1期5卷 402-410页

作者： Jiawei Sun Robert Kuschmierz Ori Katz nektarios Koukourakis Juergen W.Czarske Competence Center for Biomedical Computational Laser Systems(BIOLAS) TU DresdenDresden 01069Germany Shanghai Artificial Intelligence Laboratory Longwen Road 129Xuhui DistrictShanghai 200232China Laboratory of Measurement and Sensor System Technique(MST) TU DresdenHelmholtzstrasse 18Dresden 01069Germany Else Kroner Fresenius Center for digital Heath TU DresdenDresden 01062Germany Institute of Applied Physics The Hebrew University of JerusalemJerusalemIsrael Cluster of Excellence Physics of Life TU DresdenDresden 01062Germany Institute of Applied Physics TU DresdenDresden 01062Germany

Lensless fiber endomicroscopy,an emergent paradigm shift for minimally-invasive microscopic optical imaging and targeted light delivery,holds transformative potential,especially in *** holographic detection and physical or computational wavefront correction,it enables three-dimensional imaging in an unprecedentedly small footprint,which is crucial for various applications such as brain *** perspective reviews the recent breakthroughs,highlighting potential emerging applications,and pinpointing gaps between innovation and real-world *** the research in this realm accelerates,the novel breakthroughs and existing frontiers highlighted in this perspective can be used as guidelines for researchers joining this exciting domain.

关键词： Lensless endomicroscope Biomedical imaging Multimode fibers Multicore fibers Translation to real-world applications

Impact of travel speed on the microstructure and mechanical properties of adjustable-gap bobbin-tool friction stir welded Al–Mg joints

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第4期28卷 710-717页

作者： Dong Wu Wen-ya Li Yan-jun Gao Jun Yang Quan Wen nektarios Vidakis Achillefs Vairis State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Travel TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China Capital Aerospace Machinery Company Beijing 100076China Department of Mechanical Engineering Hellenic Mediterranean UniversityHeraklionCrete 71004Greece

The butt welds of 4-mm thick 5A06 aluminum alloy plates were produced by adjustable-gap bobbin-tool friction stir travel with travel speeds of 200, 300, and 400 mm/min in this *** microstructure was studied using optical microscopy and electron backscatter diffraction(EBSD).Tensile tests and microhardness measurements were performed to identify the effect of the travel speed on the joint mechanical *** joints were obtained at 200 mm/min while voids were present at different positions of the joints as the travel speed *** EBSD results show that the grain size, high angle grain boundaries, and density of geometrically necessary dislocations in different regions of the joint vary depending on the recovery and recrystallization *** attention was given to the relationship between the local microstructure and mechanical *** measurements show that the average hardness of the stir zone(SZ) was greater than that of the base material, which was only affected slightly by the travel *** tensile strength of the joint decreased with increasing travel speed and the maximal strength efficiency reached 99%.

关键词： friction stir welding bobbin-tool aluminum alloy microstructure mechanical properties adjustable-gap

Impact of 0.1% sodium hyaluronate and 0.2% sodium hyaluronate artificial tears on postoperative discomfort following cataract extraction surgery: a comparative study

在线全文

学校读者我要写书评

暂无评论

Eye and Vision 2019年第1期6卷 41-49页

作者： Panagiota Ntonti Eirini-Kanella Panagiotopoulou Georgios Karastatiras nektarios Breyannis Sevasti Tsironi Georgios Labiris Department of Ophthalmology University Hospital of Alexandroupolis68100 DraganaAlexandroupolisGreece Department of Ophthalmology Papanikolaou General HospitalThessalonikiGreece Department of Ophthalmology Naval Hospital of AthensAthensGreece Department of Ophthalmology Athinaiki KlinikiAthensGreece

Background:Recent artificial tear preparations have provided 0.2%concentration of sodium ***,no published data exist on their potential superiority against 0.1%in alleviating dry-eye-disease symptoms in cataract extraction ***:A total of 180 patients that underwent cataract extraction surgery were randomly divided into 2 groups according to their postoperative regime:Study group(SG)received fixed combination of tobramycin and dexamethasone(FCTD)quid for 3 weeks,and additionally 0.2%sodium hyaluronate provided in the COMOD®device quid for 6 *** group(CG)received fixed combination of tobramycin and dexamethasone(FCTD)quid for 3 weeks,and additionally 0.1%sodium hyaluronate provided in the COMOD®device quid for 6 *** following indexes were evaluated at 3 postoperative checkpoints:(1)Surface discomfort index(SDI)which was derived by four direct 10-scale Likert-type questions that were addressed to the patient and pertained to:(a)foreign body sensation(FBS),(b)blinking discomfort(BD),(c)stinging sensation(SS),(d)tearing sensation(TS),(2)Tear breakup time(TBUT),(3)Schirmer’s test,(4)Central corneal thickness(CCT),and (4)Central Corneal Sensitivity(CCS).Results:Both groups showed reduced CCS values at all postoperative examination points;however,SG participants had significantly better CCS(all p<0.05).SG had better TBUT than CG at the 3rd(p=0.03)and 6th examination points(p=0.04).Moreover,SG had better SDI scores at the 3rd(SDI=9.26±0.55)and 6th weeks(SDI=9.47±0.48)*** participants(p=0.03 and p<0.01,respectively).Conclusion:The increased 0.2%sodium hyaluronate concentration in the artificial tears provided in the COMOD®device seems to address dry-eye-disease symptoms better in patients who underwent phacoemulsification surgery than the 0.1%*** registration:*** Identifier:NCT03705949 Oct 15,2018,retrospectively registered.

关键词： Cataract Postoperative regime Artificial tears Surface discomfort index Hylocomod Hylogel Sodium hyaluronate

Securing Data in Multimode Fibers by Exploiting Mode-Dependent Light Propagation Effects

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2023年第3期2023卷 669-682页

作者： Stefan Rothe Karl-Ludwig Besser David Krause Robert Kuschmierz nektarios Koukourakis Eduard Jorswieck Jürgen W.Czarske TU Dresden Faculty of Electrical and Computer EngineeringLaboratory of Measurement and Sensor System Technique01062 DresdenGermany TU Braunschweig Faculty of Electrical EngineeringInformation TechnologyPhysicsInstitute for Communications Technology38106 BraunschweigGermany TU Dresden Faculty of Physics01062 DresdenGermany

Multimode fibers hold great promise to advance data rates in optical communications but come with the challenge to compensate for modal crosstalk and mode-dependent losses,resulting in strong *** holographic measurement of the transmission matrix enables not only correcting distortions but also harnessing these effects for creating a confidential data connection between legitimate communication parties,Alice and *** feasibility of this physical-layer-security-based approach is demonstrated experimentally for the first time on a multimode fiber link to which the eavesdropper Eve is physically *** the proper structured light field is launched at Alice’s side,the message can be delivered to Bob,and,simultaneously,the decipherment for an illegitimate wiretapper Eve is *** a real communication scenario,we implement wiretap codes and demonstrate confidentiality by quantifying the level of *** to an uncoded data transmission,the amount of securely exchanged data is enhanced by a factor of *** complex light transportation phenomena that have long been considered limiting and have restricted the widespread use of multimode fiber are exploited for opening new perspectives on information security in spatial multiplexing communication systems.

关键词： distortion destroyed holographic