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Lucas Device

Marcelo Davanco, Jin Liu, Luca Sapienza, Chen-Zhao Zhang, José Vinícius De Miranda Cardoso, Varun Verma, Richard Mirin, Sae Woo Nam, Liu Liu, Kartik Srinivasan
Single-quantum emitters are an important resource for photonic quantum technologies, constituting building blocks for single-photon sources, stationary qubits, and deterministic quantum gates. Robust implementation of such functions is achieved through systems that provide both strong light-matter interactions and a low-loss interface between emitters and optical fields. Existing platforms providing such functionality at the single-node level present steep scalability challenges. Here, we develop a heterogeneous photonic integration platform that provides such capabilities in a scalable on-chip implementation, allowing direct integration of GaAs waveguides and cavities containing self-assembled InAs/GaAs quantum dots-a mature class of solid-state quantum emitter-with low-loss Si3N4 waveguides...
October 12, 2017: Nature Communications
André Takashi Oti, Lucas Nascimento Galvão, Thyago Cezar Prado Pessoa, Camylla Rodrigues de Oliveira Rocha, Andrew Moraes Monteiro, Mauro José Pantoja Fonteles, Marcus Vinicius Henriques Brito, Edson Yuzur Yasojima
OBJECTIVE: to develop a model of training in video-surgery, of low cost and that uses a smartphone as an image-generating source. METHODS: We developed a 38cm high, 40cm wide, 40cm long hexagonal-shaped training box, with a front opening of 12x8 cm for coupling the smartphone. The internal illumination is made with LED lamps and for the support of the smartphone, we used a selfie stick, fixed in the upper part of the box, that allows control of height, distance, angulation, and the coupling of devices with different formats...
September 2017: Revista do Colégio Brasileiro de Cirurgiões
Saverio Farsoni, Luca Astolfi, Marcello Bonfe, Savino Spadaro, Carlo Alberto Volta
Point of care ultrasonography and the related focused assessment with sonography for trauma protocol, if performed by experienced physicians, is a highly sensitive examination, and specific for the detection of free fluids. Different systems and methods have been proposed for training, including simulation as one of the most efficient. This paper presents an ultrasound training system, specifically designed to be used during bedside high fidelity simulation scenarios, that could facilitate the learning process...
2017: IEEE Journal of Translational Engineering in Health and Medicine
Gregory Hunter Auton, Dmytro But, Jiawei Zhang, Ernie W Hill, Dominique Coquillat, Christophe Consejo, Philippe Nouvel, Wojciech Knap, Luca Varani, Frederic Teppe, Jeremie Torres, Aimin Song
A graphene ballistic rectifier is used in conjunction with an antenna to demonstrate a rectenna as a terahertz (THz) detector. A small-area (<1 μm2) local gate is used to adjust the Fermi level in the device to optimise the output while minimising the impact on the cut-off frequency. The device operates in both n- and p-type transport regimes and shows a peak extrinsic responsivity of 764 V/W and a corresponding noise equivalent power of 34 pW Hz-1/2 at room temperature with no indications of a cut-off frequency up to 0...
October 10, 2017: Nano Letters
Edin Nevzati, Jeannine Rey, Daniel Coluccia, Donato D'Alonzo, Basil Grüter, Luca Remonda, Javier Fandino, Serge Marbacher
The steady progess in the armamentarium of techniques available for endovascular treatment of intracranial aneurysms requires affordable and reproducable experimental animal models to test novel embolization materials such as stents and flow diverters. The aim of the present project was to design a safe, fast, and standardized surgical technique for stent assisted embolization of saccular aneurysms in a rat animal model. Saccular aneurysms were created from an arterial graft from the descending aorta.The aneurysms were microsurgically transplanted through end-to-side anastomosis to the infrarenal abdominal aorta of a syngenic male Wistar rat weighing >500 g...
October 1, 2017: Journal of Visualized Experiments: JoVE
Silvia DE Rosa, Fiorenza Ferrari, Stefano Carboni Checcacci, Alessandro Rigobello, Paolo Gennaro, Daniele DE Luca, Mirco Primadei, Federico Politi, Adriano Pellizzari, Raffaele Bonato
BACKGROUND: A new promising device, the Spritztube (ST), was developed combining the ability to perform both supraglottic ventilation and orotracheal fibreoptic intubation using the same device, allowing an easy passage from supraglottic ventilation to tracheal ventilation avoiding apnea. The present study aims to compare the speed and the subjective ease of in- sertion of the novel tracheal tube (Spritztube ®) compared to the intubating laryngeal mask airway FastrachTM [FT-LMA] in a simulation environment...
October 4, 2017: Minerva Anestesiologica
Sergii Golovynskyi, Luca Seravalli, Oleksandr Datsenko, Oleksii Kozak, Serhiy V Kondratenko, Giovanna Trevisi, Paola Frigeri, Enos Gombia, Sergii R Lavoryk, Iuliia Golovynska, Tymish Y Ohulchanskyy, Junle Qu
The bipolar effect of GaAs substrate and nearby layers on photovoltage of vertical metamorphic InAs/InGaAs in comparison with pseudomorphic (conventional) InAs/GaAs quantum dot (QD) structures were studied. Both metamorphic and pseudomorphic structures were grown by molecular beam epitaxy, using bottom contacts at either the grown n (+)-buffers or the GaAs substrate. The features related to QDs, wetting layers, and buffers have been identified in the photoelectric spectra of both the buffer-contacted structures, whereas the spectra of substrate-contacted samples showed the additional onset attributed to EL2 defect centers...
October 5, 2017: Nanoscale Research Letters
Vivek P Jani, Shawn Mailo, Ali Athar, Alfredo Lucas, Alexander T Williams, Pedro Cabrales
In 2013, nearly 15 million units of banked blood were transfused in the United States of America alone. Blood shortages are expected to increase globally. Donated blood is not equal due to differences in quality and deterioration rate. There are no methods to detect time-dependent biochemical and biophysical changes of red blood cells (RBCs) or the deterioration rate of donated RBCs. Nine randomly selected RBC units collected by the San Diego Blood Bank were examined for interdonor variability over six weeks of storage...
October 5, 2017: IEEE Transactions on Biomedical Circuits and Systems
Mengxi Lv, Yilu Zhou, Xingyu Chen, Lin Han, Liyun Wang, X Lucas Lu
Mechanical loading on articular cartilage can induce many physical and chemical stimuli on chondrocytes residing in the extracellular matrix (ECM). Intracellular calcium ([Ca(2+) ]i ) signaling is among the earliest responses of chondrocytes to physical stimuli, but the [Ca(2+) ]i signaling of in situ chondrocytes in loaded cartilage is not fully understood due to the technical challenges in [Ca(2+) ]i imaging of chondrocytes in a deforming ECM. This study developed a novel bi-directional microscopy loading device that enables the record of transient [Ca(2+) ]i responses of in situ chondrocytes in loaded cartilage...
October 5, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
Mitesh S Patel, Luca Foschini, Gregory W Kurtzman, Jingsan Zhu, Wenli Wang, Charles A L Rareshide, Susan M Zbikowski
No abstract text is available yet for this article.
September 26, 2017: Annals of Internal Medicine
Felix Büttner, Ivan Lemesh, Michael Schneider, Bastian Pfau, Christian M Günther, Piet Hessing, Jan Geilhufe, Lucas Caretta, Dieter Engel, Benjamin Krüger, Jens Viefhaus, Stefan Eisebitt, Geoffrey S D Beach
Magnetic skyrmions are stabilized by a combination of external magnetic fields, stray field energies, higher-order exchange interactions and the Dzyaloshinskii-Moriya interaction (DMI). The last favours homochiral skyrmions, whose motion is driven by spin-orbit torques and is deterministic, which makes systems with a large DMI relevant for applications. Asymmetric multilayers of non-magnetic heavy metals with strong spin-orbit interactions and transition-metal ferromagnetic layers provide a large and tunable DMI...
October 2, 2017: Nature Nanotechnology
Luca Cevenini, Antonia Lopreside, Maria Maddalena Calabretta, Marcello D'Elia, Patrizia Simoni, Elisa Michelini, Aldo Roda
The presence of chemicals with estrogenic activity in surface, groundwater, and drinking water poses serious concerns for potential threats to human health and aquatic life. At present, no sensitive portable devices are available for the rapid monitoring of such contamination. Here, we propose a cell-based mobile platform that exploits a newly developed bioluminescent yeast-estrogen screen (nanoYES) and a low-cost compact camera as light detector. Saccharomyces cerevisiae cells were genetically engineered with a yeast codon-optimized variant of NanoLuc luciferase (yNLucP) under the regulation of human estrogen receptor α activation...
September 30, 2017: Analytical and Bioanalytical Chemistry
Matthieu Halfon, Gregoire Wuerzner, Pedro Marques-Vidal, Patrick Taffe, Julien Vaucher, Bernard Waeber, Lucas Liaudet, Zied Ltaief, Milen Popov, Gerard Waeber
BACKGROUND: The use of automated (oscillometric) blood pressure (BP) devices is not validated in atrial fibrillation (AF) patients. OBJECTIVES: To assess the reliability of three oscillometric BP devices, and the agreement with invasive arterial blood pressure(IBP) in AF patients. METHODS: 48 AF patients with randomized sequences of 10 consecutive BP measurements with two pairs of devices: (1) OmronR7™(wrist) and OmronHEM907™(arm); (2) OmronR7™ and Microlife WatchBPhome(arm)...
September 28, 2017: Blood Pressure
A Serra, G Spinato, R Spinato, A Conti, L Licciardello, M Di Luca, G Campione, G Tonoli, D Politi, V Castro, A Maniaci, L Maiolino, S Cocuzza
The aim of this study was to assess the clinical experience of three Italian centers using the third generation Provox Vega prosthesis, in terms of device life and voice outcome, comparing the results with the second generation Provox 2 prosthesis in the same sample. A prospective multicenter crossover study was performed in three phases. In the first phase we performed a reassessment, for enrollment purposes, of patients who were categorized into four different groups [normal – group A; radio-treated – group B; gastroesophageal reflux disease (GERD) – group C; and elderly subjects – group D]...
July 2017: Journal of Biological Regulators and Homeostatic Agents
Elie Azoulay, Peter Pickkers, Marcio Soares, Anders Perner, Jordi Rello, Philippe R Bauer, Andry van de Louw, Pleun Hemelaar, Virginie Lemiale, Fabio Silvio Taccone, Ignacio Martin Loeches, Tine Sylvest Meyhoff, Jorge Salluh, Peter Schellongowski, Katerina Rusinova, Nicolas Terzi, Sangeeta Mehta, Massimo Antonelli, Achille Kouatchet, Andreas Barratt-Due, Miia Valkonen, Precious Pearl Landburg, Fabrice Bruneel, Ramin Brandt Bukan, Frédéric Pène, Victoria Metaxa, Anne Sophie Moreau, Virginie Souppart, Gaston Burghi, Christophe Girault, Ulysses V A Silva, Luca Montini, François Barbier, Lene B Nielsen, Benjamin Gaborit, Djamel Mokart, Sylvie Chevret
BACKGROUND: In immunocompromised patients with acute hypoxemic respiratory failure (ARF), initial management aims primarily to avoid invasive mechanical ventilation (IMV). METHODS: To assess the impact of initial management on IMV and mortality rates, we performed a multinational observational prospective cohort study in 16 countries (68 centers). RESULTS: A total of 1611 patients were enrolled (hematological malignancies 51.9%, solid tumors 35...
September 25, 2017: Intensive Care Medicine
Guy N Rutty, Claire Robinson, Jasmin Amoroso, Tim Coats, Bruno Morgan
AIM: Firstly, to develop an optimised chest compression post mortem computed tomography angiography protocol in the adult human during closed chest compression to investigate cardiopulmonary resuscitation blood flow, and secondly to provide preliminary observations of post-mortem anatomical cardiac chamber movement using a novel radiolucent static chest compression device. METHODS: Variable volumes of radiological contrast agent were injected intravenously into a series of consented human cadavers...
September 23, 2017: Resuscitation
Francesco Giannini, Azeem Latib, Matteo Montorfano, Neil Ruparelia, Vittorio Romano, Matteo Longoni, Luca Ferri, Richard Jabbour, Antonio Mangieri, Damiano Regazzoli, Marco Ancona, Nicola Buzzatti, Lorenzo Azzalini, Akihito Tanaka, Eustachio Agricola, Alaide Chieffo, Ottavio Alfieri, Antonio Colombo
BACKGROUND: Second generation transcatheter aortic valve implantation (TAVI) devices have been designed to reduce the rate of paravalvular leak (PVL) and other complications. An important technological advancement has been the ability to fully reposition devices to facilitate optimal implantation depth and position to reduce the likelihood of PVL. OBJECTIVES: To compare procedural and 30-day outcomes according to the Valve Academic Research Consortium (VARC)-2 criteria following TAVI with the fully repositionable and retrievable Lotus and DFM devices...
September 20, 2017: Catheterization and Cardiovascular Interventions
Philip R Wolinsky, Justin F Lucas
Achieving and maintaining reduction in patients with a diaphyseal femur fracture may be difficult; therefore, thorough preoperative planning is required. To fully prepare for successful surgical management of diaphyseal femur fractures, surgeons must consider appropriate patient positioning and necessary tools, including surgical tables, traction devices, and instruments. Principles of acceptable reduction rely on the restoration of length, alignment, and rotation. Reduction of diaphyseal femur fractures should be attained in the least invasive manner, via percutaneous reduction techniques, if possible, to preserve fracture biology and promote successful fracture healing...
September 21, 2017: Journal of the American Academy of Orthopaedic Surgeons
Stephen G Ellis, Giuseppe Steffenino, Dean J Kereiakes, Gregg W Stone, R J van Geuns, Alexandre Abizaid, Holger Nef, Bernardo Cortese, Luca Testa, Maurizio Menichelli, Corrado Tamburino, Tommaso Gori, Takeshi Kimura, Patrick W Serruys, Salvatore Brugaletta, Manel Sabaté, Run-Lin Gao
OBJECTIVES: The authors sought to identify and verify independent correlates of device thrombosis from an analysis of multicenter trials and registries. BACKGROUND: Recent analyses suggest an increased risk of device thrombosis with Absorb bioresorbable vascular scaffold (Abbott Vascular, Santa Clara, California) implantation compared with metallic drug-eluting stents, and data from moderate size studies suggest a risk relationship to vessel size and technique. METHODS: From 8,771 consecutively treated patients, 105 patients (1...
September 25, 2017: JACC. Cardiovascular Interventions
Fabio Pareschi, Mauro Mangia, Daniele Bortolotti, Andrea Bartolini, Luca Benini, Riccardo Rovatti, Gianluca Setti
In recent years, compressed sensing (CS) has proved to be effective in lowering the power consumption of sensing nodes in biomedical signal processing devices. This is due to the fact the CS is capable of reducing the amount of data to be transmitted to ensure correct reconstruction of the acquired waveforms. Rakeness-based CS has been introduced to further reduce the amount of transmitted data by exploiting the uneven distribution to the sensed signal energy. Yet, so far no thorough analysis exists on the impact of its adoption on CS decoder performance...
September 13, 2017: IEEE Transactions on Biomedical Circuits and Systems
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