Search Results - "Theocharis, G."

Bifurcation-based acoustic switching and rectification by Boechler, N., Theocharis, G., Daraio, C.

“…Acoustic rectifiers are of relevance for applications such as biomedical ultrasound imaging. In these systems, amplification increases gradually with signal…”
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Non-Hermitian acoustic metamaterials: Role of exceptional points in sound absorption by Achilleos, V., Theocharis, Georgios, Richoux, Olivier, Pagneux, V.

“…Effective non-Hermitian Hamiltonians are obtained to describe coherent perfect absorbing and lasing boundary conditions. PT symmetry of the Hamiltonians…”
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Use of complex frequency plane to design broadband and sub-wavelength absorbers by Romero-García, V., Theocharis, G., Richoux, O., Pagneux, V.

“…The reflection of sound of frequency below 1 kHz, by a rigid-backed structure that contains sub-wavelength resonators is studied in this work. In particular,…”
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Perfect and broadband acoustic absorption by critically coupled sub-wavelength resonators by Romero-García, V., Theocharis, G., Richoux, O., Merkel, A., Tournat, V., Pagneux, V.

“…Perfect absorption is an interdisciplinary topic with a large number of applications, the challenge of which consists of broadening its inherently narrow…”
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Highly nonlinear wave propagation in elastic woodpile periodic structures by Kim, E, Li, F, Chong, C, Theocharis, G, Yang, J, Kevrekidis, P G

“…In the present work, we experimentally implement, numerically compute with, and theoretically analyze a configuration in the form of a single column woodpile…”
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Discrete breathers in one-dimensional diatomic granular crystals by Boechler, N, Theocharis, G, Job, S, Kevrekidis, P G, Porter, Mason A, Daraio, C

“…We report the experimental observation of modulational instability and discrete breathers in a one-dimensional diatomic granular crystal composed of compressed…”
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Control of acoustic absorption in one-dimensional scattering by resonant scatterers by Merkel, A., Theocharis, G., Richoux, O., Romero-García, V., Pagneux, V.

“…We experimentally report perfect acoustic absorption through the interplay of the inherent losses and transparent modes with high Q factor. These modes are…”
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The Emerging Role of Neutrophils in the Pathogenesis of Thrombosis in COVID-19 by Iliadi, Valeria, Konstantinidou, Ina, Aftzoglou, Konstantina, Iliadis, Sergios, Konstantinidis, Theocharis G., Tsigalou, Christina

“…Previous studies have shown that COVID-19 leads to thrombotic complications, which have been associated with high morbidity and mortality rates. Neutrophils…”
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The Usefulness of Rare Blood Group Systems in the Risk Determination for Severe COVID-19 by Konstantinidis, Theocharis G, Iliadi, Valeria, Martinis, Georges, Panopoulou, Maria

“…The newly identified human coronavirus was named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), based on a detailed analysis of clinical…”
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Limits of slow sound propagation and transparency in lossy, locally resonant periodic structures by Theocharis, G, Richoux, O, García, V Romero, Merkel, A, Tournat, V

“…We investigate sound propagation in lossy, locally resonant periodic structures by studying an air-filled tube periodically loaded with Helmholtz resonators…”
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Coherent perfect absorption induced by the nonlinearity of a Helmholtz resonator by Achilleos, V., Richoux, O., Theocharis, G.

“…In this work, coherent perfect absorption of sound waves induced by the nonlinear response of a Helmholtz Resonator side loaded to a waveguide, is reported. It…”
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Experimental observation of oscillating and interacting matter wave dark solitons by Weller, A, Ronzheimer, J P, Gross, C, Esteve, J, Oberthaler, M K, Frantzeskakis, D J, Theocharis, G, Kevrekidis, P G

“…We report on the generation, subsequent oscillation and interaction of a pair of matter-wave dark solitons. These are created by releasing a Bose-Einstein…”
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Wave propagation in a strongly nonlinear locally resonant granular crystal by Vorotnikov, K., Starosvetsky, Y., Theocharis, G., Kevrekidis, P.G.

“…In this work, we study the wave propagation in a recently proposed acoustic structure, the locally resonant granular crystal. This structure is composed of a…”
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Tunable magneto-granular phononic crystals by Allein, F., Tournat, V., Gusev, V. E., Theocharis, G.

“…This paper reports on the study of the dynamics of 1D magneto-granular phononic crystals composed of a chain of spherical steel beads inside a properly…”
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Decreased Levels of Soluble Developmental Endothelial Locus-1 Are Associated with Thrombotic Microangiopathy in Pregnancy by Romanidou, Gioulia, Konstantinidis, Theocharis G, Natsi, Anastasia-Maria, Kantartzi, Konstantia, Panopoulou, Maria, Kontomanolis, Emmanouil, Tsigalou, Christina, Lambropoulou, Maria, Gavriilaki, Eleni, Panagoutsos, Stylianos, Pasadakis, Ploumis, Mitroulis, Ioannis

“…HELLP (Hemolysis, Elevated Liver enzymes and Low Platelets) syndrome is a life-threatening complication of pregnancy, which is often secondary to preeclampsia…”
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The Emerging Role of the Gut Microbiome in Cardiovascular Disease: Current Knowledge and Perspectives by Papadopoulos, Panagiotis D, Tsigalou, Christina, Valsamaki, Pipitsa N, Konstantinidis, Theocharis G, Voidarou, Chrysoula, Bezirtzoglou, Eugenia

“…The collection of normally non-pathogenic microorganisms that mainly inhabit our gut lumen shapes our health in many ways. Structural and functional…”
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Subwavelength Interferometric Control of Absorption in Three-port Acoustic Network by Richoux, O., Achilleos, V., Theocharis, G., Brouzos, I.

“…Utilizing the effect of losses, we show that symmetric 3-port devices exhibit coherent perfect absorption of waves and we provide the corresponding conditions…”
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Legionella pneumophila: The Journey from the Environment to the Blood by Iliadi, Valeria, Staykova, Jeni, Iliadis, Sergios, Konstantinidou, Ina, Sivykh, Polina, Romanidou, Gioulia, Vardikov, Daniil F., Cassimos, Dimitrios, Konstantinidis, Theocharis G.

“…An outbreak of a potentially fatal form of pneumonia in 1976 and in the annual convention of the American Legion was the first time that Legionella spp. was…”
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Nonlinear Hysteretic Torsional Waves by Cabaret, J, Béquin, P, Theocharis, G, Andreev, V, Gusev, V E, Tournat, V

“…We theoretically study and experimentally report the propagation of nonlinear hysteretic torsional pulses in a vertical granular chain made of cm-scale,…”
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Invariant currents in lossy acoustic waveguides with complete local symmetry by Kalozoumis, P. A., Richoux, O., Diakonos, F. K., Theocharis, G., Schmelcher, P.

“…We implement the concept of complete local symmetry in lossy acoustic waveguides. Despite the presence of losses, the existence of a spatially invariant…”
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