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Affichage de 1621 à 1630 sur 16094

Article dans une revue

PDAtt-Unet: Pyramid Dual-Decoder Attention Unet for Covid-19 infection segmentation from CT-scans

Fares Bougourzi, Cosimo Distante, Fadi Dornaika, Abdelmalik Taleb-Ahmed

Since the emergence of the Covid-19 pandemic in late 2019, medical imaging has been widely used to analyze this disease. Indeed, CT-scans of the lungs can help diagnose, detect, and quantify Covid-19 infection. In this paper, we address the segmentation of Covid-19 infection from CT-scans. To...

Medical Image Analysis, 2023, 86, pp.102797. ⟨10.1016/j.media.2023.102797⟩. ⟨hal-04187792⟩

Article dans une revue

Subsonic cavity flow control with Micro-Magneto-Mechanical Systems (MMMS) microvalves

Thomas Arnoult, Colin Leclercq, Cécile Ghouila-Houri, A. Mazzamurro, R. Viard, Eric Garnier, C. Poussot-Vassal, A. Merlen, Denis Sipp, Philippe Pernod, Abdelkrim Talbi

Flow control consists in modifying a flow natural state in order to converge towards another state which is considered as favorable, as drag or noise radiation might be reduced. In this paper, open-loop flow control experiments are carried out on a subsonic open-cavity flow. In the case of unstable...

Sensors and Actuators A: Physical , 2023, 354, pp.114257. ⟨10.1016/j.sna.2023.114257⟩. ⟨hal-04045012⟩

Article dans une revue

Investigation of Current Collapse Mechanism on AlGaN/GaN Power Diodes

Martin Doublet, N. Defrance, Etienne Okada, Loris Pace, Thierry Duquesne, Bouyssou Emilien, Arnaud Yvon, Nadir Idir, Jean-Claude de Jaeger

In this paper, a methodology is proposed for studying the current collapse effects of Gallium Nitride (GaN) power diodes and the consequences on the dynamic on-resistance (RON). Indeed, the growing interest of GaN based, high frequency power conversion requires an accurate characterization and a...

Electronics, 2023, 12 (9), pp.2007. ⟨10.3390/electronics12092007⟩. ⟨hal-04107504⟩

Article dans une revue

Relation between thermal quenching of photoluminescence and negative capacitance on InGaN/GaN multiple quantum wells in p-i-n structure

Orhan Özdemir, Hanife Baş, Neslihan Ayarcı Kuruoğlu, Kutsal Bozkurt, Mustafa Aydın, Fahrettin Sarcan, Ayşe Erol, Bandar Alshehri, Karim Dogheche, El Hadj Dogheche

Temperature-dependent photoluminescence (PL) and surface photovoltage (SPV) measurements were carried out to detect radiative and non-radiative transitions on InGaN/GaN quantum well (QW) blue light-emitting device (LED). The emissions, peaking at 3.03 eV and 2.89 eV, were present in both PL and SPV...

Journal of Luminescence, 2023, 257, pp.119749. ⟨10.1016/j.jlumin.2023.119749⟩. ⟨hal-03997376⟩

Article dans une revue

Design and fabrication of an inverted hat antenna paired with a filled cavity for radio-navigation applications

Z. Hamouda, S. Azaizia, M. Hideche, A. Zemmam, T. Lasri

Antennas installed on aircraft are used for communications as well as for various radio navigation systems such as direction finders, distance measuring systems, and altimeters. Generally, these systems use blade antennas operating in the L frequency band. Recently, inverted-hat empty section...

International Journal of Microwave and Wireless Technologies, 2023, 15 (4), pp.641 - 648. ⟨10.1017/S1759078722000629⟩. ⟨hal-03694832⟩

Article dans une revue

Effect of different separation frequencies of the two-tone input signal on the output power of GaN on SiC HEMT

Mohammad Abdul Alim, Mayahsa Ali, Christophe Gaquière

This research aims to determine whether a GaN HEMT device made on SiC substrate has a memory effect. To accomplish this, the intermodulation distortion technique with the separation frequency (Δf) of the two-tone input signals was applied at three different frequency levels, one at f1 = 53 MHz and...

Micro and Nanostructures, 2023, 177, pp.207547. ⟨10.1016/j.micrna.2023.207547⟩. ⟨hal-04034333⟩

Article dans une revue

Friction dynamics of elasto-inertial turbulence in Taylor–Couette flow of viscoelastic fluids

Masoud Moazzen, Tom Lacassagne, Vincent Thomy, S. Amir Bahrani

Dynamic properties of elasto-inertial turbulence (EIT) are studied in a Taylor–Couette geometry. EIT is a chaotic flow state that develops upon both non-negligible inertia and viscoelasticity. A combination of direct flow visualization and torque measurement allows to verify the earlier onset of...

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2023, 381 (2246), ⟨10.1098/rsta.2022.0300⟩. ⟨hal-04215397⟩

Article dans une revue

A novel cloud approach for connected vehicles

Geoffrey Wilhelm, Marwane Ayaida, Hacène Fouchal

Cooperative intelligent transport systems (C-ITSs) are being deployed all around the world. Shortly, in addition to vehicles, bicycles, pedestrians, buses, and all moving equipment will be compatible with C-ITS. These systems are connected through wireless local area networks based on WIFI IEEE 802...

Applied Sciences, 2023, Special Issue Cooperative-Intelligent Transport Systems: New Challenges, 13 (9), pp.5514. ⟨10.3390/app13095514⟩. ⟨hal-04188109⟩

Article dans une revue

Performance improvement with non-alloyed ohmic contacts technology on AlGaN/GaN High Electron Mobility Transistors on 6H-SiC substrate

Marie Lesecq, Yassine Fouzi, Ali Abboud, N. Defrance, Francois Vaurette, Saliha Ouendi, Etienne Okada, Marc Portail, Micka Bah, Daniel Alquier, Jean-Claude de Jaeger, Eric Frayssinet, Yvon Cordier

In this paper, non-alloyed ohmic contacts regrown by molecular beam epitaxy (MBE) are fabricated on AlGaN/ GaN high-electron-mobility transistors on 6H-SiC substrate. Low ohmic contact resistance of 0.13 Ω.mm is obtained. This paper demonstrates the high frequency and high power performance...

Microelectronic Engineering, 2023, 276, pp.111998. ⟨10.1016/j.mee.2023.111998⟩. ⟨hal-04084512⟩

Article dans une revue

Precision of neuronal localization in 2D cell cultures by using high-performance electropolymerized microelectrode arrays correlated with optical imaging

Mahdi Ghazal, Corentin Scholaert, Corentin Dumortier, Camille Lefebvre, Nicolas Barois, Sebastien Janel, Mehmet Tarhan, Morvane Colin, Luc Buée, Sophie Halliez, Sébastien Pecqueur, Yannick Coffinier, F. Alibart, Pierre Yger

Recently, the development of electronic devices to extracellularly record the simultaneous electrical activities of numerous neurons has been blooming, opening new possibilities to interface and decode neuronal activity. In this work, we tested how the use of EDOT electropolymerization to tune post...

Biomedical Physics & Engineering Express, 2023, 9 (3), pp.035016. ⟨10.1088/2057-1976/acb93e⟩. ⟨hal-03999001⟩