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The thoracic impedance (TI) signal, which reflects fluctuations due to CCs and ventilations, has been suggested as a surrogate to compute CC-rate and ventilation-rate during cardiopulmonary resuscitation. This study developed a method based on empirical mode decomposition (EMD) to compute CC-rate and ventilation-rate using exclusively the TI. Twenty out-of-hospital cardiac arrest episodes containing...
In this paper we present a theoretical study on the influence of band-to-band-tunnelling (BTBT) in HgCdTe-based nBn detectors for longwave infrared (LWIR) applications. Numerical modelling shows that BTBT strongly depends on the barrier parameters and degrades the detectivity of LWIR nBn detectors. Nevertheless, exploring alternative barrier materials or engineering designs which are able to suppress...
We evaluated a data set consisting of 38 different materials — threats and non-threats — to determine whether there are signatures detectable in CT systems equipped with energy-resolving photon-counting detectors that would help the detection task. Data with such detectors was collected in a lab setup using a Compton spectrometer and simple transmission measurements through samples of known material...
A fingerprint liveness detector is a pattern classifier that is used to distinguish a live finger from a fake (spoof) one in the context of an automated fingerprint recognition system. Most liveness detectors are learning-based and rely on a set of training images. Consequently, the performance of a liveness detector significantly degrades upon encountering spoofs fabricated using new materials not...
We have carried out a terahertz (THz) passive measurement of high-Tc superconductive materials down to liquid nitrogen temperature at 1.5–2.5 THz using a 4 K-cryocooled stressed Ge:Ga photoconductive detector. Using the calibration line, which gives the relation between THz signal emitted from sample, emissivity and temperature, we have derived the temperature-dependent THz emissivity of superconductive...
In a very large vessel, maintain ultrahigh vacuum (UHV) is a challenge. The LIGO (Laser Interferometer Gravitational Wave Observatory vacuum envelope is one of the large vacuum chambers in the world. LIGO vacuum system consists of two arms of 4 km long beam tubes of 1.2 meter diameter. Ultrahigh Vacuum (UHV) environment is required to reduce residual gas phase noise to enhance accuracy of measurement...
Energy resolved photon-counting detectors could achieve more than one spectral measurement. The goal of this study is to investigate, with experiment, the ability to decompose five materials using energy discriminating detectors and multiple discriminant analysis (MDA). A small field-of-view multi-energy CT system was built. Linear attenuation coefficient was considered as features of multiple energy...
SnO2 nanoparticles possess optical and electrical properties that make them suitable for the fabrication of UV photodetectors. This paper presents the material fabrication and characterization followed by the device fabrication and characterization of a SnO2 colloidal nanoparticles based ultraviolet photodetector. The fabricated detector exhibits a high signal to noise ratio of 5.8 × 103 low dark...
In this talk, I start by summarizing the main goals and recent achievements of MPNS COST ACTION MP1204, TERA-MIR Radiation: Materials, Generation, Detection and Applications, whose main objectives are to advance novel materials, concepts and device designs for generating and detecting THz and Mid Infrared radiation using semiconductor, superconductor, metamaterials and lasers and to beneficially exploit...
Biomedical imaging has become one of the most relied-upon tools in health-care for diagnosis and treatment of human diseases. The evolution of medical imaging from plain radiography (radioisotope imaging), to x-ray imaging, to computer-assisted tomography (CAT scans), to ultrasound imaging, and to magnetic resonance imaging (MRI) has led to revolutionary improvements in the quality of healthcare available...
Traditional supervised target detection methods need target spectra as prior knowledge. When the target spectra can only be acquired from the lab or field, they may be very different from the real target spectra obtained from images, which results in low accuracy of these target detection methods. In order to solve this problem, a new preprocessing method used for target detection in hyperspectral...
Interferometric gravitational wave detectors are amongst the most sensitive instruments ever built. They are hunting for tiny oscillations in space-time originating from cosmic events such as inspiraling objects or supernova explosions. These detectors are based on Michelson-like interferometers reaching sensitivities for lengths changes of better than 10−18 m/√Hz. Currently, a second generation of...
Characterization method for active layers for microelectrodes of electrochemical and gas sensors using scanning electron microscopy (SEM) is presented. In order to achieve maximum sensitivity and selectivity of the sensor, it is necessary to obtain precise knowledge of electrode's surface. Characterization was made using FEI Magellan SEM equipped with TLD secondary electron (SE) and CBS back-scattered...
In this work the design and characteristics of an extended hemispherical dielectric lens applied to a non-planar antenna for the detection of THz radiation is presented. Antenna and lens behavior is numerically investigated in a large frequency range around the central frequency of 1 THz. Common printable materials widely characterized at THz range are used for the lens realization. Numerical results...
A III-nitride-based Quantum Cascade detector grown by MOCVD is designed, fabricated and tested. Peak responsivity of 100 µA/W with detectivity of up to 108 Jones at ∼ 4 µm is measured.
We present the first single-shot images of a laser-driven shock wave interacting with micron-scale materials inhomogeneities taken with an X-ray free electron laser. Materials dynamics under high strain-rate loading is important to a range of problems.
This paper presents a mechanism that involves the integration of a pixel blind to infrared (IR) radiation into a focal plane array (FPA) for thermal detection. The blind pixel serves as a reference capacitor while scanning the FPA active pixels. In harsh environment conditions (e.g. shocks and wide changes in ambient temperature), this mechanism yields down to a 0.83% percent error in the measured...
Container transport is the major way of freight transportation. In order to assure the safe freight transportation and examine the cargo container non-intrusively for contrabands, the radiation detection technology has been utilized more during last decade. One of the challenging issues in the non-intrusive scanning technology is to improve the scanning speed which can improve the allowable speed...
This research involved a 3D simulation of a non-destructive test by detecting fluorescence X-ray with a position sensitive CdTe detector. Simulations proceeded in various conditions such as different types of phantoms. All simulations were based on fluorescence X-ray computed tomography (FXCT) by using the Monte Carlo method. In general, conventional Computed Tomography (CT) analyzes materials based...
9Be convertor has been successfully used in photoneutron and x-ray radiography system (PNXR) to achieve material identification by combining X-ray imaging and photoneutron imaging technologies together within one 7 MeV LINAC. The photoneutron convertor, a 2.6 kg 9Be cylinder of 16cm × 7 cm that converts photons to photoneutrons, has the advantages of high neutron yield (1010∼1011 n/s), robustness...
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