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Yaniv Oiknine, Isaac August, Adrian Stern
In this Letter, we present a new snapshot hyperspectral (HS) camera based on a multi-aperture design. The technique uses an array of modified Fabry-Perot resonators together with a lens array in order to acquire an array of spectrally multiplexed modulated sub-images. Then the original HS image is reconstructed using a compressive sensing reconstruction algorithm. The HS camera has high optical throughput and enables acquisition of almost gigapixel HS datacubes with hundreds of spectral bands. Using our camera, we demonstrate optical compression of approximately 37:1...
October 15, 2018: Optics Letters
Ke Chen, Zhihao Yu, Zhenfeng Gong, Qingxu Yu
An all-optical photoacoustic spectroscopy based on lock-in white-light interferometry is proposed for trace gas detection. The cavity length of the fiber-optic Fabry-Perot cantilever microphone is demodulated by a high-speed white-light interferometer, whose spectral sampling is synchronously triggered by a phased locked signal. To improve the signal-to-noise ratio, the demodulated digital photoacoustic signal is further processed by a specially designed virtual lock-in amplifier. The designed photoacoustic spectrometer has been tested for trace acetylene (C2 H2 ) detection in the near-infrared region...
October 15, 2018: Optics Letters
Markus Pollnau
The longitudinal optical modes of a Fabry-Perot resonator are investigated. We consider (1) the three- and one-dimensional spectral mode density in free space and in standing-wave resonators, (2) the infinite sum of mode profiles, resulting in the Airy distribution, (3) comparison between a two-mirror resonator and an infinite periodic lensguide, and (4) comparison between a two-mirror resonator and a ring resonator. It is consistently deduced that the two counter-propagating waves with wave vectors ±|kq | at the same resonance frequency νq and polarization constitute independent optical modes with mode indices ±|q|...
October 15, 2018: Optics Letters
Jan Fábry
In the title structure, C6 H6 N2 O·H6 O6 Te, the pyridine-3-carboxamide and telluric acid mol-ecules are inter-connected by conventional O-H⋯N, N-H⋯O and O-H⋯O hydrogen bonds of moderate strength as well as by π-π inter-actions between the pyridine rings. The strongest hydrogen bond in the structure is formed between a hydroxyl group of the H6 TeO6 mol-ecule and the N -pyrimidine N atom. The structure is unusual because of presence of the alternating sheets, which contain H6 TeO6 and pyridine-3-carboxamide mol-ecules, respectively...
October 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Richard Gerum, Sebastian Richter, Ben Fabry, Céline Le Bohec, Francesco Bonadonna, Anna Nesterova, Daniel Zitterbart
During breeding, king penguins do not build nests, however they show strong territorial behaviour and keep a pecking distance to neighbouring penguins. Penguin positions in breeding colonies are highly stable over weeks and appear regularly spaced, but thus far no quantitative analysis of the structural order inside a colony has been performed. In this study, we use the radial distribution function to analyse the spatial coordinates of penguin positions. Coordinates are obtained from aerial images of two colonies that were observed for several years...
April 25, 2018: Journal of Physics D: Applied Physics
C Marchesoni, E Cisneros, P Pfister, P Yáñez, C Rollan, C Romero, I Kisinovsky, L Rattagan, L León Cejas, A Pardal, G Sevlever, R Reisin
OBJECTIVE: To evaluate the presence of white matter and hemorrhagic lesions in brain MRI of children and adolescents with Fabry disease (FD). METHODS: Brain MRI studies in 44 consecutive children and teenagers (20 boys, mean age 14.6 years, range 7-21 years) were evaluated using classic sequences as well as, GRE-weighted images, for white matter lesions (WML) and chronic microbleed detection. All patients lacked history of stroke or TIA. Brain MRI findings in 46 consecutive children and adolescents without FD, referred for the evaluation of headaches (36 females, mean age 14...
October 5, 2018: Journal of the Neurological Sciences
Yusuke Tsujiie, Yoshiyuki Kawamura
The Fabry-Pérot interferometer is used in a variety of high-precision optical interferometry applications, such as gravitational wave detection. It is also used in various types of laser resonators to act as a narrow band filter. In addition, ultra-compact Fabry-Pérot interferometers are used in the optical resonators of semiconductor lasers and fiber-optic systems. In this work, we developed a micro-scale Fabry-Pérot interferometer that was constructed within the Rayleigh range of the optical focusing system...
October 12, 2018: Scientific Reports
Jin Cheng, Yu Zhou, Xiaoping Zou
Fiber Fabry⁻Perot cavity sensing probes with high thermal stability for dynamic signal detection which are based on a new method of structure compensation by a proposed thermal expansion model, are presented here. The model reveals that the change of static cavity length with temperature only depends on the thermal expansion coefficient of the materials and the structure parameters. So, fiber Fabry⁻Perot cavity sensing probes with inherent temperature insensitivity can be obtained by structure compensation...
October 10, 2018: Sensors
Steven K Malin, Monique E Francois, Natalie Z M Eichner, Nicole M Gilbertson, Emily M Heiston, Chiara Fabris, Marc D Breton
The effect of work-matched exercise intensity on β-cell function is unknown in people with prediabetes prior to clinical weight loss. We determined if short-term moderate continuous (CONT) versus high intensity interval (INT) exercise increased β-cell function. Thirty-one subjects (Age: 61.4±2.5 yr; BMI: 32.1±1.0 kg/m2 ) with prediabetes (ADA criteria, 75g OGTT) were randomized to work-matched CONT (70% HRpeak) or INT (3 min 90% HRpeak and 3 min 50% HRpeak) exercise for 60min/d over 2-weeks. A 75g 2 hr OGTT was conducted after an overnight fast, and plasma glucose, insulin, C-peptide and FFA were determined for calculations of skeletal muscle (Oral Minimal Model; OMM), hepatic (HOMA-IR), and adipose (Adipose-IR) insulin sensitivity...
October 11, 2018: Journal of Applied Physiology
Katalin Szendrei-Temesi, Alberto Jiménez-Solano, Bettina V Lotsch
The intuitive use, inexpensive fabrication, and easy readout of colorimetric sensors, including photonic crystal architectures and Fabry-Pérot interference sensors, have made these devices a successful commercial case, and yet, understanding how the diffusion of analytes occurs throughout the structure is a key ingredient for designing the response of these platforms on demand. Herein, the diffusion of amines in a periodic multilayer system composed of two-dimensional nanosheets and dielectric nanoparticles is tracked by a combination of spectroscopic measurements and theoretical modelling...
October 10, 2018: Advanced Materials
Enrico Fabris, Arnoud Van't Hof, Christian W Hamm, Frédéric Lapostolle, Jens Flensted Lassen, Shaun G Goodman, Jurriën M Ten Berg, Leonardo Bolognese, Angel Cequier, Mohamed Chettibi, Christopher J Hammett, Kurt Huber, Magnus Janzon, Béla Merkely, Robert F Storey, Uwe Zeymer, Warren J Cantor, Mathieu Kerneis, Abdourahmane Diallo, Eric Vicaut, Gilles Montalescot
OBJECTIVE: We investigated, in the contemporary era of ST-elevation myocardial infarction (STEMI) treatment, the influence of diabetes mellitus (DM) on cardiovascular outcomes, and whether pre-hospital administration of ticagrelor may affect these outcomes in a subgroup of STEMI patients with DM. BACKGROUND: DM patients have high platelet reactivity and a prothrombotic condition which highlight the importance of an effective antithrombotic regimen in this high-risk population...
October 9, 2018: Catheterization and Cardiovascular Interventions
Renjun Du, Ming-Hao Liu, Jens Mohrmann, Fan Wu, Ralph Krupke, Hilbert von Löhneysen, Klaus Richter, Romain Danneau
We show that in gapped bilayer graphene, quasiparticle tunneling and the corresponding Berry phase can be controlled such that they exhibit features of single-layer graphene such as Klein tunneling. The Berry phase is detected by a high-quality Fabry-Pérot interferometer based on bilayer graphene. By raising the Fermi energy of the charge carriers, we find that the Berry phase can be continuously tuned from 2π down to 0.68π in gapped bilayer graphene, in contrast to the constant Berry phase of 2π in pristine bilayer graphene...
September 21, 2018: Physical Review Letters
Cheryl Suwen Law, Siew Yee Lim, Andrew D Abell, Nicolas H Voelcker, Abel Santos
Optical sensors are a class of devices that enable the identification and/or quantification of analyte molecules across multiple fields and disciplines such as environmental protection, medical diagnosis, security, food technology, biotechnology, and animal welfare. Nanoporous photonic crystal (PC) structures provide excellent platforms to develop such systems for a plethora of applications since these engineered materials enable precise and versatile control of light⁻matter interactions at the nanoscale...
October 4, 2018: Nanomaterials
Jehwan Hwang, Boram Oh, Yeongho Kim, Sinhara Silva, Jun Oh Kim, David A Czaplewski, Jong Eun Ryu, Eun Kyu Kim, Augustine Urbas, Jiangfeng Zhou, Zahyun Ku, Sang Jun Lee
We present experimental and theoretical investigations on the polarization properties of a single- and a double-layer gold (Au) grating, serving as a wire grid polarizer. Two layers of Au gratings form a cavity that effectively modulates the transmission and reflection of linearly polarized light. Theoretical calculations based on a transfer matrix method reveals that the double-layer Au grating structure creates an optical cavity exhibiting Fabry-Perot (FP) resonance modes. As compared to a single-layer grating, the FP cavity resonance modes of the double-layer grating significantly enhance the transmission of the transverse magnetic (TM) mode, while suppressing the transmission of the transverse electric (TE) mode...
October 3, 2018: Scientific Reports
Hiroki Katsuta, Kazuya Tsuboi, Hiroshi Yamamoto, Hiromi Goto
BACKGROUND: Fabry disease is an X-linked lysosomal storage disorder and shows globotriosylceramide (Gb3) accumulation in multiple organs, resulting from a deficiency of α-galactosidase. In patients with Fabry disease, cardiovascular disease occurs at an early age. Previous studies have shown that serum levels of high-density lipoprotein-cholesterol (HDL-C) increase in this disease, yet its clinical significance for cardiovascular disease remains unclear. Methods and Results: In order to determine why the serum HDL-cholesterol is high in various cardiovascular diseases of Fabry disease patients, we evaluated the serum lipid profiles, ocular vascular lesions, and levels of serum vascular endothelial growth factor (VEGF) and intercellular adhesion molecule-1 in 69 patients with Fabry disease diagnosed by genetic examination...
October 3, 2018: Circulation Journal: Official Journal of the Japanese Circulation Society
Ravi Vijapurapu, Sabrina Nordin, Shanat Baig, Boyang Liu, Stefania Rosmini, Joao Augusto, Michel Tchan, Derralynn A Hughes, Tarekegn Geberhiwot, James C Moon, Richard Paul Steeds, Rebecca Kozor
INTRODUCTION: Detecting early cardiac involvement in Fabry disease (FD) is important because therapy may alter disease progression. Cardiovascular magnetic resonance (CMR) can detect T1 lowering, representing myocardial sphingolipid storage. In many diseases, early mechanical dysfunction may be detected by abnormal global longitudinal strain (GLS). We explored the relationship of early mechanical dysfunction and sphingolipid deposition in FD. METHODS: An observational study of 221 FD and 77 healthy volunteers (HVs) who underwent CMR (LV volumes, mass, native T1, GLS, late gadolinium enhancement), ECG and blood biomarkers, as part of the prospective multicentre Fabry400 study...
October 3, 2018: Heart: Official Journal of the British Cardiac Society
Tomoya Kaneda, Masahiro Takeda, Tetsuro Suematsu, Ryusuke Yamamoto, Mutsuko Takata, Toshinori Higashikata, Hidekazu Ino, Akihiko Tsujibata, Kenshi Hayashi, Noboru Fujino, Masa-Aki Kawashiri
The long-term effects of enzyme replacement therapy (ERT) on cardiac function and the conduction system in Fabry disease are not clearly understood. We report a case of a 48-year-old man with non-classical Fabry disease treated with ERT for 11 years. He was diagnosed with Fabry disease at age 27 years based on the presence of decreased alpha-galactosidase A activity in the peripheral leukocytes and of the causal alpha-galactosidase A mutation (Val339Gln). Subsequently, peritoneal dialysis was initiated for renal failure at age 35 years...
May 2018: Journal of Cardiology Cases
Elvin Kedhi, Enrico Fabris, Martin van der Ent, Pawel Buszman, Clemens von Birgelen, Vincent Roolvink, Alexander Zurakowski, Carl E Schotborgh, Jan C A Hoorntje, Christian Hasbø Eek, Stéphane Cook, Marco Togni, Martijn Meuwissen, Niels van Royen, Ria van Vliet, Hans Wedel, Ronak Delewi, Felix Zijlstra
OBJECTIVE: To show that limiting dual antiplatelet therapy (DAPT) to six months in patients with event-free ST-elevation myocardial infarction (STEMI) results in a non-inferior clinical outcome versus DAPT for 12 months. DESIGN: Prospective, randomised, multicentre, non-inferiority trial. SETTING: Patients with STEMI treated with primary percutaneous coronary intervention (PCI) and second generation zotarolimus-eluting stent. PARTICIPANTS: Patients with STEMI aged 18 to 85 that underwent a primary PCI with the implantation of second generation drug-eluting stents were enrolled in the trial...
October 2, 2018: BMJ: British Medical Journal
Keegan Orr, Ian George, Aaron Reinhard
We present a simple, inexpensive pressure-tuned Fabry Pérot interferometer which can be used to frequency stabilize and tune a laser when no suitable atomic reference is available. Our design, made largely from off-the-shelf parts, yields a tuning range of about 4 GHz and offers an absolute tuning accuracy of better than 1 MHz. The interferometer, which uses air as its working medium, is characterized by a low thermal drift rate of order 1 MHz per hour.
September 2018: Review of Scientific Instruments
Lorenzo Ugga, Sirio Cocozza, Giuseppe Pontillo, Camilla Russo, Vincenzo Brescia Morra, Roberta Lanzillo, Eleonora Riccio, Antonio Pisani, Arturo Brunetti
BACKGROUND AND PURPOSE: Multiple Sclerosis (MS) has been proposed as a possible differential diagnosis with Fabry Disease (FD). We evaluated the incidence of infratentorial lesions in FD patients, investigating whether their presence could help in differentiating these two conditions. We explored the diagnostic accuracy of this sign alone and in combination to the involvement of corpus callosum (CC). METHODS: White Matter lesions were retrospectively evaluated on FLAIR images available from 136 MS and 144 FD patients...
October 2, 2018: Brain and Behavior
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