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Cyclic loading of marble:Correlating the attenuation of the electric and acoustic activities and highlighting criticality indices in terms of natural time

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International Journal of Mining Science and Technology 2025年第2期35卷 159-174页

作者： dimos triantis Ilias Stavrakas Ermioni D.Pasiou Stavros K.Kourkoulis University of West Attica Department of Electrical&Electronics EngineeringElectronic Devices and Materials LaboratoryAncient Olive Grove CampusAthens 12244Greece National Technical University of Athens School of Applied Mathematical and Physical SciencesDepartment of MechanicsLaboratory for Testing and MaterialsAthens 15773Greece

The attenuation of the acoustic activity in marble specimens under uniaxial compressive loadingunloading loops is quantified in juxtaposition to that of the electric *** parallel,the existence of"pre-failure indiceso"warning about entrance into a critical stage,that of impending fracture,is *** acoustic activity is quantified in terms of the normalized number of acoustic hits,their average rate of production and their cumulative energy,and,the cumulative counts and their average rate of *** electric activity is studied in terms of the pressure stimulated currents and the electric charge *** analysis revealed that the acoustic and electric activities are linearly correlated to each other,suggesting that they are different manifestations of the same damage *** addition,Kaiser's effect,governing the acoustic activity,is found to govern,also,the electric ***,it is concluded that entrance into the critical stage is safely predicted by means of a simple criterion,based on the evolution of the average rate of change of the normalized cumulative counts in the natural time *** predictions are almost identical with those of the criterion based on the "varianceo" and the "entropies" of the time series of acoustic events in this domain.

关键词： Marble cyclic loading Acoustic emissions Kaiser's effect Pressure stimulated currents Criticality indices Natural time

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Cyclic loading of marble:Correlating the attenuation of the electric and acoustic activities and highlighting criticality indices in terms of natural time

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International Journal of Mining Science and Technology 2025年第2期 159-174页

作者： dimos triantis Ilias Stavrakas Ermioni D.Pasiou Stavros K.Kourkoulis University of West Attica Department of Electrical & Electronics Engineering Electronic Devices and Materials Laboratory Ancient Olive Grove Campus National Technical University of Athens School of Applied Mathematical and Physical Sciences Department of Mechanics Laboratory for Testing and Materials

The attenuation of the acoustic activity in marble specimens under uniaxial compressive loadingunloading loops is quantified in juxtaposition to that of the electric activity. In parallel, the existence of ‘‘pre-failure indiceso warning about entrance into a critical stage, that of impending fracture, is explored. The acoustic activity is quantified in terms of the normalized number of acoustic hits, their average rate of production and their cumulative energy, and, the cumulative counts and their average rate of change. The electric activity is studied in terms of the pressure stimulated currents and the electric charge released. The analysis revealed that the acoustic and electric activities are linearly correlated to each other, suggesting that they are different manifestations of the same damage mechanisms. In addition, Kaiser's effect, governing the acoustic activity, is found to govern, also, the electric ***, it is concluded that entrance into the critical stage is safely predicted by means of a simple criterion, based on the evolution of the average rate of change of the normalized cumulative counts in the natural time domain. These predictions are almost identical with those of the criterion based on the‘‘varianceo and the ‘‘entropieso of the time series of acoustic events in this domain.

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Nondestructive Testing Electrical Methods for Sensing Damages in Cement Mortar Beams

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Open Journal of Applied Sciences 2013年第1期3卷 50-55页

作者： Charalampos Stergiopoulos Ilias Stavrakas George Hloupis Antonios Kyriazopoulos dimos triantis Cimon Anastasiadis John Stonham Department of Electronics Technological Educational Institute of Athens Athens Greece School of Engineering and Design Brunel University Brunel United Kingdom

This paper discusses the experimental results of concurrently measured Electrical and Acoustic Emissions in order to evaluate the mechanical health status of cement mortar beams subjected to three-point bending mechanical tests. In particular, the Electrical Resistance and the Electrical Current emissions are recorded concurrent with Acoustic Emissions and the experimental results are discussed under the concept of crack initiation and propagation processes. For the first time, the electrodes that are used for conducting the measurements are placed in the bulk of the specimen, near the tensile zone, during its preparation. The damage evolution is examined by monitoring the fractional change of the Electrical Resistance and the variation of the Electrical Current in combination with the Acoustic Emission recordings.

关键词： Non-Destructive Testing Electrical Resistance Acoustic and Electrical Current Emissions Cement

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Using AC Conductivity Measurements to Study the Influence of Mechanical Stress on the Strength of Geomaterials

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Open Journal of Applied Sciences 2012年第2期2卷 61-65页

作者： Ilias Stavrakas Kostantinos Moutzouris Kostantinos Ninos Nikos Mitritsakis Zacharias Agioutantis dimos triantis Department of Electronics Technological Educational Institute of Athens Athens Greece Department of Mineral Resources Engineering Technical University of Crete Chania Greece

The Dielectric Spectroscopy technique is a tool that can be used to provide information regarding the physical and chemical properties of materials. In this work Dielectric Spectroscopy (DS) measurements were conducted on marble specimens that were previously subjected to uniaxial compressive stress up to fracture in order to investigate the influence of the mechanical stress on the dielectric properties of the specimens. Specifically, the ac conductivity (σac) was measured when an ac electric field in the frequency range 1 kHz - 1 MHz was applied upon dry and saturated specimens which were subjected successively to higher levels of mechanical stress. The experimental results indicate that there are systematic variations in the values of the ac conductivity after each stress application at a higher stress level. Such variations become more intense at higher stress values and can be used to indicate the upcoming fracture since significant increase of conductivity is recorded when microcracks formations appear and propagate in the sample bulk.

关键词： AC Conductivity Measurements Marble Mechanical Load

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Advances in the management of posttraumatic stress disorder after critical illness: a narrative review

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Emergency and Critical Care Medicine 2024年第4期4卷 174-182页

作者： Evanthia Asimakopoulou Panagiotis Theodosis-Nobelos Charalampos triantis Department of Nursing School of Health SciencesFrederick UniversityNicosiaCyprus Department of Pharmacy School of Health SciencesFrederick UniversityNicosiaCyprus

Illness requiring critical care can lead to the development of posttraumatic stress disorder(PTSD),a complex mental health condition resulting from exposure to traumatic *** the intensive care unit(ICU),the nature of interventions often contributes to a high incidence of PTSD,which is a significant component of post-intensive care syndrome(PICS).This article provides a comprehensive overview of the pathophysiological mechanisms underlying PTSD and explores various intervention strategies,emphasizing the importance of a multidis-ciplinary and holistic *** prevention remains the best therapy,pharmacotherapy is a key component in the management of PTSD ***,particularly selective serotonin reuptake inhibitors(SSRIs)and serotonin-norepinephrine reuptake inhibitors(SNRIs),have demonstrated efficiency in alleviating symptoms.3,4-Methylenedioxymethamphetamine–assisted therapy is the most promising approach,and the results of the clinical trials are ***,medications targeting specific neurotransmission sys-tems involved in fear responses and emotional regulation are being explored,offering promising avenues for future *** interventions are integral to PTSD *** are often employed alone or in conjunction with ***-based psycho-therapies,such as cognitive-behavioral therapy and exposure therapies,are effective in addressing maladaptive thought patterns and facilitating trauma *** interventions,lifestyle modifications have emerged as significant contributors to resilience and *** physical exercise,adequate sleep,and robust social support networks are integral to the overall well-being of patients who have developed PTSD after critical *** integrating pharmacological and nonpharmacological approaches within a holistic framework,clinicians and re-searchers could better address the complex nature of PTSD and enhance the quality of ca

关键词： Critical illness Management Nonpharmacological interventions Pharmacological interventions Posttraumatic stress disorder

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Marble epistyles under shear: an experimental study of the role of “Relieving Space”

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Frontiers of Structural and Civil Engineering 2019年第4期13卷 767-786页

作者： E. D. PASIOU I. STAVRAKAS D. triantis S. K. KOURKOULIS Department of Mechanics Laboratory of Testing and Materials National Technical University of Athens Athens 15773 Greece Department of Electronics Laboratory of Electrical Characterization of Materials and Electronic Devices Technological Edu-cational Institution of Athens Athens 12210 Greece

The mechanical response of mutually interconnected epistyles is studied experimentally. The specimens are made of two marble blocks connected to each other with an “I”-shaped titanium connector placed in grooves sculptured on the blocks and covered with cementitious material. The specific way of connecting epistyles simulates the one used by scientists restoring the ancient “connections” of the epistyles of the Parthenon Temple. This “connection”, although designed to sustain mainly tensile loading, undertakes, also, shear load, in case of excitations imposing to the epistyles displacements normal to the connector’s axis. Attention is focused to enlighten the role of a novel design technique aiming to relieve the stress field around the connector. According to this technique, part of the connector’s web is left uncovered, forming the so-called “Relieving Space”, assisting the unconstrained deformation of the connector. Both traditional and innovative sensing techniques were employed in an effort to obtain data from the interior of the three-material-complex (marble-cementitious material-titanium). Analysis of the data indicated that the “Relieving Space” reduces the overall stiffness of the system, protecting marble in case of over-loading. Moreover, it was concluded that the innovative techniques employed provide pre-failure indicators well in advance of the catastrophic failure of the specimens.

关键词： monuments of cultural heritage marble epistyles pressure stimulated currents acoustic emission digital image correlation

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On the cell biology of pit cells,the liver-specific NK cells

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World Journal of Gastroenterology 2000年第1期6卷 1-11页

作者： Luo DZ Vermijlen D Ahishali B triantis V Plakoutsi G Braet F Vanderkerken K Wisse E Laboratory for Cell Biology and Histology Free University of Brussels(VUB)Brussels-JetteBelgium Department of Pathology Guangxi Medical University NanningChina Laboratory for Cell Biology and Histology Free University of Brussels(VUB)Brussels-JetteBelgium Department of Hematology and Immunology Free University of Brussels(VUB)Brussels-JetteBelgium

INTRODUCTION Natural killer (NK) cells are functionally defined by their ability to kill certain tumor cells and virus-infected cells without prior

关键词： Subject headings pit cells hepatic natural killer cells large granular lymphocytes

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Participation of CD45,NKR-P1A and ANK61 antigen in rat hepatic NK cell(pit cell)-mediated target cell cytotoxicity

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World Journal of Gastroenterology 2000年第4期6卷 546-552页

作者： David Vermiilen Bülent Ahishali Vasilis triantis Karin Vanderkerken Peter J. K.Kuppen Eddie Wisse Laboratory for Cell Biology and Histology. Department of Hematology and immunology Free University of Brussels(VUB)Brussels-JetteBelgium K Vanderkerken is a postdoctoral researcher of the Fund for Scientific Research Flanders. Department of Surgery and Pathology Leiden University Medical CenterLeidenThe Netherlands

AIM Several triggering receptors have beendescribed to be involved in natural killer（NK）cell-mediated target *** these studies,NKcells derived from blood or spleen were *** are liver-specific NK cells that possess ahigher level of natural cytotoxicity and a differentmorphology when compared to blood NK *** aim of this study was to characterize the roleof the NK-triggering molecules NKR-P1A,ANK61antigen,and CD45 in pit cell-mediated killing oftarget *** 51Cr-release and DNA fragmentationwere used to quantify target cell lysis andapoptosis,*** Flow cytometric analysis showed thatpit cells expressed CD45,NKR-P1A,and *** of pit cells with monoclonalantibody（mAb）to CD45（ANK74）not onlyinhibited CC531s or YAC-1 target lysis but alsoapoptosis induced by pit *** mAbs to NKR-P1A（3.2.3）and ANK61 antigen（ANK61）had no effect on pit cell-mediated CC531s or YAC-1 targetcytolysis or apoptosis,while they did increase theFcγ receptor positive（FcγR+）P815 cytolysis *** enhanced cytotoxicity could beinhibited by 3,4-dichloroisocoumarin,an inhibitorof *** These results indicate that CD45participates in pit cell-mediated CC531s and YAC-1target cytolysis and ***-P1A andANK61 antigen on pit cells function as activationstructures against FcγR+ P815 cells,which wasmediated by the perforin/granzyme pathway.

关键词： hepatic NK cells pit cells cytolysis apoptosis perforin/granzyme pathway

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COVID-19 and the heart

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World Journal of Clinical Cases 2022年第28期10卷 9970-9984页

作者： Andrew Xanthopoulos Angeliki Bourazana Grigorios Giamouzis Evangelia Skoularigki Apostolos dimos Alexandros Zagouras Michail Papamichalis Ioannis Leventis Dimitrios E Magouliotis Filippos Triposkiadis John Skoularigis Department of Cardiology University Hospital of LarissaLarissa 41110Greece Department of Cardiothoracic Surgery University of ThessalyLarissa BiopolisLarissa 41110Greece

An outbreak of coronavirus disease 2019(COVID-19) occurred in December 2019 due to severe acute respiratory syndrome coronavirus 2(SARS-Co V-2),which is a strain of SARS-Co *** infected with the virus present a wide spectrum of manifestations ranging from mild flu-like symptoms,cough,fever and fatigue to severe lung injury,appearing as bilateral interstitial pneumonia or acute respiratory *** SARS-Co V-2 infection predominantly offends the respiratory system,it has been associated with several cardiovascular complications as *** example,patients with COVID-19 may either develop type 2 myocardial infarction due to myocardial oxygen demand and supply imbalance or acute coronary syndrome resulting from excessive inflammatory response to the primary *** incidence of COVID-19 related myocarditis is estimated to be accountable for an average of 7% of all COVID-19 related fatal cases,whereas heart failure(HF) may develop due to infiltration of the heart by inflammatory cells,destructive action of pro-inflammatory cytokines,micro-thrombosis and new onset or aggravated endothelial and respiratory ***,SARSCo V-2 can engender arrhythmias through direct myocardial damage causing acute myocarditis or through HF decompensation or secondary,through respiratory failure or severe res-piratory distress *** this comprehensive review we summarize the COVID-19 related cardiovascular complications(acute coronary syndromes,myocarditis,HF,arrhythmias) and discuss the main underlying pathophysiological mechanisms.

关键词： COVID-19 Virus Complications Cardiac Acute coronary syndromes Heart failure Myocarditis Arrhythmias

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Current knowledge and contemporary management of non-A non-B aortic dissections

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World Journal of Cardiology 2023年第5期15卷 244-252页

作者： Konstantinos C Christodoulou dimos Karangelis Gioultzan Memet Efenti Panagiotis Sdrevanos Jennifer R Browning Fotis Konstantinou Efstratios Georgakarakos Fotios A Mitropoulos Dimitrios Mikroulis Department of Cardiac Surgery Democritus University of ThraceUniversity Hospital of AlexandroupolisAlexandroupolis 68100Greece Department of Surgery Didimotichon General HospitalDidimotichon 68300Greece Cardioiasis Cardiology Clinic Xanthi 67100Greece Department of Vascular Surgery University Hospital of AlexandroupolisDemocritus University of ThraceAlexandroupolis 68100Greece Department of Cardiac Surgery Mitera HospitalAthens 15123Greece

Non-A non-B aortic dissection(AAD)is an infrequently documented condition,comprising of only a small proportion of all *** unique anatomy of the aortic arch and the failure of the existing classifications to adequately define individuals with non-A non-B AAD,have led to an ongoing controversy around the *** seems that the clinical progression of acute non-A non-B AAD diverges from the typical type A and B dissections,frequently leading to serious complications and thus mandating early ***,the available treatment methods in the surgical armamentarium are conventional open,endovascular techniques and combined hybrid *** optimum approach is tailored in every individual case and may be determined by the dissection’s location,extent,the aortic diameter,the associated complications and the patient’s *** management of non-A non-B dissections still remains challenging and a unanimous consensus defining the gold standard treatment has yet to be *** an attempt to provide further insight into this perplexing entity,we performed a minireview of the literature,aiming to elucidate the epidemiology,clinical course and the optimal treatment modality.

关键词： Aortic dissection Aortic disease Aortic surgery Thoracic aorta disease Aortic arch dissection

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