A5005690302- Adaptive optics and wavefront sensing
- Noise Effects and Management
- Advanced optical system design
- Railway Engineering and Dynamics
- Calibration and Measurement Techniques
- Vehicle Noise and Vibration Control
- Civil and Geotechnical Engineering Research
- Structural Engineering and Vibration Analysis
- Fluid Dynamics and Turbulent Flows
- Gas Dynamics and Kinetic Theory
- Hearing Loss and Rehabilitation
- Computational Fluid Dynamics and Aerodynamics
- Astronomy and Astrophysical Research
- Spacecraft and Cryogenic Technologies
- Optical Systems and Laser Technology
- Geotechnical Engineering and Underground Structures
- Acoustic Wave Phenomena Research
- solar cell performance optimization
- Optical Wireless Communication Technologies
- Stellar, planetary, and galactic studies
- Wind and Air Flow Studies
- Spacecraft Design and Technology
- Infrastructure Maintenance and Monitoring
- Vehicle emissions and performance
- Railway Systems and Energy Efficiency
University of Thessaly
2013-2024
Aristotle University of Thessaloniki
1989-2024
Las Cumbres Observatory Global Telescope Network
2018-2024
TMT Observatory
2009-2024
United States Air Force Research Laboratory
2017-2019
Engility (United States)
2016-2018
École Polytechnique
2016-2018
Optica
2006-2014
AHEPA University Hospital
2014
Large Synoptic Survey Telescope Corporation
2012
Railway local irregularities are a growing source of ground-borne vibration and can cause negative environmental impacts, particularly in urban areas. Therefore, this paper analyses the effect railway track singular defects (discontinuities) on ground generation propagation. A vehicle/track/soil numerical model is presented, capable accurately predicting levels. The prediction composed multibody vehicle model, flexible finite/infinite element soil model. Firstly, analysis undertaken to...
This paper describes the finite element modelling and in situ evaluation of anti-vibration mitigation measures recently introduced latest two extensions on lines 2 3 Athens Metro: (1) extension Line from Aigaleo to Haidari (2) Agios Antonios Anthoupoli. Appropriate measures, guaranteeing allowable ground-borne noise vibration levels, especially crossover (CO) locations, were examined, within a study. To do this, alignment was divided into homogeneous sections, i.e. sections along which...
During the operation of urban subway rail transit systems, vibrations are generated that transmitted through soil, induce in nearby buildings. The transmission ground-borne from systems a building is governed by soil-foundation interaction, reduction vibration level between floors, and amplication due to resonances elements. These influenced type building, its construction materials, foundation frequency content excitation. A methodology proposed for determination sound along height specic...
This paper analyses the influence of rolling stock dynamics on ground-borne vibration levels. Four vehicle types (Thalys, German ICE, Eurostar, and Belgian freight trains) are investigated using a multibody approach. First, numerical model is constructed flexible track which vehicles traverse at constant speed. A two-step approach used to simulate ground wave propagation analysed various distances from track. offers new insight because train fully coupled. Therefore rail unevenness or other...
This article proposes an alternative approach to the well-known Federal Railroad Administration method evaluate ground vibrations induced by passing of railway vehicles. The originality lies on excitation mechanisms that occur in urban areas. A common source railway-induced is local defects (rail joints, switches, and turnouts) which cause large amplitude excitations at isolated locations along track. To analyse such situations, a combined numerical-experimental study developed, based use...
Systemic inflammation has been recognized as the cause and consequence of metabolic dysregulation in diabetes mellitus (DM). Presepsin recently emerged a promising biomarker for detection bacterial infections sepsis. There is evidence that gut dysbiosis results increased circulating concentrations Gram-negative bacteria lipopolysaccharide, linkage presepsin, which turn promotes insulin resistance correlates with risk diabetic complications. Thus, we hypothesized presepsin could reflect...
Abstract Background Acute vigorous exercise, associated with increased release of plasma catecholamines, transiently increases the risk primary cardiac arrest. We tested effect acute submaximal exercise on vasoactive substances and their combined result platelet function. Methods Healthy volunteers, hypertensive patients coronary artery disease (CAD) performed a modified treadmill test. determined thromboxane A 2 , prostacyclin, endothelin-1 aggregation induced by adenosine diphosphate (ADP)...
Abstract In the framework of European Directive 2002/49/EC, city Herakleion in Crete Island (Greece) recently completed (2013) its Strategic Noise Map (SNM) and relevant Action Plan (NAP). noise mapping action plans are important tools to define main strategies reduce exposure residents introduce preserve "quite zones". Within this as a part Mapping general specific analysis was introduced urban area Alikarnassos (east city) adjacent International Airport “Nikos Kazantzakis”. The 2nd biggest...
Over the syears, rapid growth in railway infrastructure has led to numerous environmental challenges. One such significant issue, particularly urban areas, is ground-borne vibration. A common source of vibration caused by local defects (e.g. rail joints, switches, turnouts, etc.) that generate large amplitude excitations at isolated locations. Modelling these excitation sources challenging and requires use complex extensive computational efforts. For some situations, experiments measured...
Abstract In Wuhan city, China, there was an influx of cases pneumonia. On 9 January 2020, the Health Authorities China announced that it is a new strain coronavirus (COVID-19). Coronaviruses are group viruses usually cause respiratory infections with varying severity in humans and animals. After announcement first deaths because COVID-19 disease, all over world, as Greece, concerted efforts being made to tackle spread SARS-CoV-2 virus relevant disease. To delay limit transmission virus,...