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https://www.readbyqxmd.com/read/28718788/implementation-of-an-imu-aided-image-stacking-algorithm-in-a-digital-camera-for-unmanned-aerial-vehicles
#1
Ahmad Audi, Marc Pierrot-Deseilligny, Christophe Meynard, Christian Thom
Images acquired with a long exposure time using a camera embedded on UAVs (Unmanned Aerial Vehicles) exhibit motion blur due to the erratic movements of the UAV. The aim of the present work is to be able to acquire several images with a short exposure time and use an image processing algorithm to produce a stacked image with an equivalent long exposure time. Our method is based on the feature point image registration technique. The algorithm is implemented on the light-weight IGN (Institut national de l'information géographique) camera, which has an IMU (Inertial Measurement Unit) sensor and an SoC (System on Chip)/FPGA (Field-Programmable Gate Array)...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28717236/high-performance-micro-flow-cytometer-based-on-optical-fibres
#2
S Etcheverry, A Faridi, H Ramachandraiah, T Kumar, W Margulis, F Laurell, A Russom
Flow cytometry is currently the gold standard for analysis of cells in the medical laboratory and biomedical research. Fuelled by the need of point-of-care diagnosis, a significant effort has been made to miniaturize and reduce cost of flow cytometers. However, despite recent advances, current microsystems remain less versatile and much slower than their large-scale counterparts. In this work, an all-silica fibre microflow cytometer is presented that measures fluorescence and scattering from particles and cells...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716433/unmyelinated-peripheral-nerves-can-be-stimulated-in%C3%A2-vitro-using-pulsed-ultrasound
#3
Christopher J Wright, Seyyed R Haqshenas, John Rothwell, Nader Saffari
Appreciation for the medical and research potential of ultrasound neuromodulation is growing rapidly, with potential applications in non-invasive treatment of neurodegenerative disease and functional brain mapping spurring recent progress. However, little progress has been made in our understanding of the ultrasound-tissue interaction. The current study tackles this issue by measuring compound action potentials (CAPs) from an ex vivo crab walking leg nerve bundle and analysing the acoustic nature of successful stimuli using a passive cavitation detector (PCD)...
July 14, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28715333/wheelchair-neuroprosthesis-for-improving-dynamic-trunk-stability
#4
Kramay Patel, Matija Milosevic, Kimitaka Nakazawa, Milos R Popovic, Kei Masani
Trunk instability is a major problem for individuals with thoracic and cervical spinal cord injury. Functional electrical stimulation (FES) neuroprosthesis, a technology that uses small electrical currents to artificially contract muscles, has previously been utilized to improve trunk stability during quasistatic and dynamic sitting. The aim of this study was to develop the first powered wheelchair-based neuroprosthesis and to test its feasibility for improving trunk stability. Eleven male, able-bodied individuals participated in the feasibility study...
July 14, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28714888/a-multiscale-approach-to-the-smart-deployment-of-micro-sensors-over-lightweight-structures
#5
Giovanni Capellari, Francesco Caimmi, Matteo Bruggi, Stefano Mariani
A topology optimization approach has been recently proposed to maximize the sensitivity to damage of measurements, collected through a network of sensors to be deployed over thin plates for structural health monitoring purposes. Within such a frame, damage is meant as a change in the structural health characterized by a reduction of relevant stiffness and load-carrying properties. The sensitivity to a damage of unknown amplitude and location is computed by comparing the response to the external actions of the healthy structure and of a set of auxiliary damaged structures, each one featuring reduced mechanical properties in a small region only...
July 15, 2017: Sensors
https://www.readbyqxmd.com/read/28713214/first-principles-equation-of-state-table-of-beryllium-based-on-density-functional-theory-calculations
#6
Y H Ding, S X Hu
Beryllium has been considered a superior ablator material for inertial confinement fusion (ICF) target designs. An accurate equation-of-state (EOS) of beryllium under extreme conditions is essential for reliable ICF designs. Based on density-functional theory (DFT) calculations, we have established a wide-range beryllium EOS table of density ρ = 0.001 to 500 g/cm(3) and temperature T = 2000 to 10(8) K. Our first-principle equation-of-state (FPEOS) table is in better agreement with the widely used SESAME EOS table (SESAME 2023) than the average-atom INFERNO and Purgatorio models...
June 2017: Physics of Plasmas
https://www.readbyqxmd.com/read/28709340/correlation-and-transport-properties-for-mixtures-at-constant-pressure-and-temperature
#7
Alexander J White, Lee A Collins, Joel D Kress, Christopher Ticknor, Jean Clérouin, Philippe Arnault, Nicolas Desbiens
Transport properties of mixtures of elements in the dense plasma regime play an important role in natural astrophysical and experimental systems, e.g., inertial confinement fusion. We present a series of orbital-free molecular dynamics simulations on dense plasma mixtures with comparison to a global pseudo ion in jellium model. Hydrogen is mixed with elements of increasingly high atomic number (lithium, carbon, aluminum, copper, and silver) at a fixed temperature of 100 eV and constant pressure set by pure hydrogen at 2g/cm^{3}, namely, 370 Mbars...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709337/nested-polyhedra-model-of-turbulence
#8
Ö D Gürcan
A discretization of the wave-number space is proposed, using nested polyhedra, in the form of alternating dodecahedra and icosahedra that are self-similarly scaled. This particular choice allows the possibility of forming triangles using only discretized wave vectors when the scaling between two consecutive dodecahedra is equal to the golden ratio and the icosahedron between the two dodecahedra is the dual of the inner dodecahedron. Alternatively, the same discretization can be described as a logarithmically spaced (with a scaling equal to the golden ratio), nested dodecahedron-icosahedron compounds...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709267/aggregation-and-fragmentation-dynamics-in-random-flows-from-tracers-to-inertial-aggregates
#9
Ksenia Guseva, Ulrike Feudel
We investigate the aggregation and fragmentation dynamics of tracers and inertial aggregates in random flows leading to steady-state size distributions. Our objective is to elucidate the impact of changes in aggregation rates due to differences in advection dynamics, especially with respect to the influence of inertial effects. This aggregation process is, at the same time, balanced by fragmentation triggered by local hydrodynamic stress. Our study employs an individual-particle-based model, tracking the position, velocity, and size of each aggregate...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709236/publisher-s-note-x-ray-shadow-imprint-of-hydrodynamic-instabilities-on-the-surface-of-inertial-confinement-fusion-capsules-by-the-fuel-fill-tube-phys-rev-e-95-031204-r-2017
#10
A G MacPhee, D T Casey, D S Clark, S Felker, J E Field, S W Haan, B A Hammel, J Kroll, O L Landen, D A Martinez, P Michel, J Milovich, A Moore, A Nikroo, N Rice, H F Robey, V A Smalyuk, M Stadermann, C R Weber
This corrects the article DOI: 10.1103/PhysRevE.95.031204.
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28708542/an-ambulatory-gait-monitoring-system-with-activity-classification-and-gait-parameter-calculation-based-on-a-single-foot-inertial-sensor
#11
Minsu Song, Jonghyun Kim
GOAL: For healthcare and clinical use, ambulatory gait monitoring systems using inertial sensors have been developed to estimate the user gait parameters, such as walking speed, stride time, and stride length. However, to adapt the systems effectively to daily-life activities, they need to be able to classify the gait activities of daily-life to obtain the parameters for each activity. In this study, we propose a simple classification algorithm based on a single inertial sensor for ease of use, which classifies three major gait activities: leveled walk, ramp walk, and stair walk...
July 12, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28707561/profiling-the-physical-load-on-riders-of-top-level-motorcycle-circuit-racing
#12
Emanuele D'Artibale, Paul B Laursen, John B Cronin
Manoeuvring a motorcycle at high-speed in official competition has been shown to expose riders to substantial and complex physiological and psychological demands, however few studies have analysed the physical load experienced by professional racers. This study aimed to quantify the physical stress experienced by riders and explore relationships between performance related variables (i.e. crashes). Performance and braking data were collected from official race reports from 2013 to 2015 of the top class of the FIM Road Racing Grand Prix World Championship...
July 14, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28703891/duration-of-action-of-mepivacaine-and-lidocaine-in-equine-palmar-digital-perineural-blocks-in-an-experimental-lameness-model
#13
Mona Hoerdemann, Rachael L Smith, Giselle Hosgood
OBJECTIVE: To establish and compare the onset and duration of action of 2 local anesthetics based on objective lameness and skin sensitivity assessment. STUDY DESIGN: Interventional crossover experimental trial with balanced randomization. ANIMALS: Eight horses. METHODS: Reversible forelimb lameness was induced in 8 horses. A palmar digital nerve block (PDNB) was applied with mepivacaine or lidocaine (both 2%). Quantitative lameness and skin sensitivity data were collected with an inertial sensor system and a force gauge, respectively...
July 13, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28698498/polar-grid-navigation-algorithm-for-unmanned-underwater-vehicles
#14
Zheping Yan, Lu Wang, Wei Zhang, Jiajia Zhou, Man Wang
To solve the unavailability of a traditional strapdown inertial navigation system (SINS) for unmanned underwater vehicles (UUVs) in the polar region, a polar grid navigation algorithm for UUVs is proposed in this paper. Precise navigation is the basis for UUVs to complete missions. The rapid convergence of Earth meridians and the serious polar environment make it difficult to establish the true heading of the UUV at a particular instant. Traditional SINS and traditional representation of position are not suitable in the polar region...
July 9, 2017: Sensors
https://www.readbyqxmd.com/read/28697877/alterations-in-thoracolumbosacral-movement-when-pain-causing-lameness-has-been-improved-by-diagnostic-analgesia
#15
L Greve, S Dyson, T Pfau
Lameness, thoracolumbosacral pain and reduced range of motion (ROM) often coexist; better understanding of their relationship is needed. The objectives were to determine if thoracolumbosacral movement of horses changes when pain causing lameness is improved by diagnostic analgesia. We hypothesised that reduction of lameness will increase ROM of the thoracolumbosacral region. Thirteen horses with different types of hind limb lameness were trotted in straight lines and lunged on a 10m diameter circle on left and right reins before and after lameness was subjectively substantially improved by diagnostic analgesia...
June 2017: Veterinary Journal
https://www.readbyqxmd.com/read/28697795/improved-prosthetic-hand-control-with-concurrent-use-of-myoelectric-and-inertial-measurements
#16
Agamemnon Krasoulis, Iris Kyranou, Mustapha Suphi Erden, Kianoush Nazarpour, Sethu Vijayakumar
BACKGROUND: Myoelectric pattern recognition systems can decode movement intention to drive upper-limb prostheses. Despite recent advances in academic research, the commercial adoption of such systems remains low. This limitation is mainly due to the lack of classification robustness and a simultaneous requirement for a large number of electromyogram (EMG) electrodes. We propose to address these two issues by using a multi-modal approach which combines surface electromyography (sEMG) with inertial measurements (IMs) and an appropriate training data collection paradigm...
July 11, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28691694/context-dependent-adaptation-improves-robustness-of-myoelectric-control-for-upper-limb-prostheses
#17
Gauravkumar K Patel, Janne Mathias Hahne, Claudio Castellini, Dario Farina, Strahinja Dosen
OBJECTIVE: Dexterous upper-limb prostheses are available today to restore grasping, but an effective and reliable feed-forward control is still missing. The aim of this work was to improve the robustness and reliability of myoelectric control by using context information from sensors embedded within the prosthesis. APPROACH: We developed a context-driven myoelectric control scheme (cxMYO) that incorporates the inference of context information from proprioception (inertial measurement unit) and exteroception (force and grip aperture) sensors to modulate the outputs of myoelectric control...
July 10, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28691124/measuring-changes-in-gait-and-vehicle-transfer-ability-during-inpatient-rehabilitation-with-wearable-inertial-sensors
#18
Vladimir Borisov, Gina Sprint, Diane J Cook, Douglas L Weeks
Restoration of functional independence in gait and vehicle transfer ability is a common goal of inpatient rehabilitation. Currently, ambulation changes tend to be subjectively assessed. To investigate more precise objective assessment of progress in inpatient rehabilitation, we quantitatively assessed gait and transfer performances over the course of rehabilitation with wearable inertial sensors for 20 patients receiving inpatient rehabilitation services. Secondarily, we asked physical therapists to provide feedback about the clinical utility of metrics derived from the sensors...
March 2017: Proc IEEE Int Conf Pervasive Comput Commun Workshops
https://www.readbyqxmd.com/read/28690920/do-bradykinesia-and-tremor-interfere-in-voluntary-movement-of-essential-tremor-patients-preliminary-findings
#19
Etienne Goubault, Hung P Nguyen, Fouaz S Ayachi, Sarah Bogard, Christian Duval
BACKGROUND: The aim of this study was to determine whether tremor and bradykinesia impacted a dexterous activity performed by patients with essential tremor (ET). METHODS: Core bradykinesia was assessed in 27 controls and 15 patients with ET using a rapid alternating movement (RAM) task. Then, participants performed a "counting money" counting tasks while equipped with inertial measurement units to detect and quantify tremor during movement. The time required to perform subsections of the tasks and the rate of failure (errors) were compared between groups using Mann-Whitney U tests and a chi-square test, respectively...
2017: Tremor and Other Hyperkinetic Movements
https://www.readbyqxmd.com/read/28687953/the-effect-of-treadmill-and-overground-walking-on-preferred-walking-speed-and-gait-kinematics-in-healthy-physically-active-older-adults
#20
Davide Malatesta, Mosè Canepa, Aitor Menendez Fernandez
PURPOSE: Preferred walking speed (PWS) represents a performance measure of mobility in older individuals. PWS is usually assessed during overground (via a 2-40 m walkway) or treadmill walking in older adults. The aim of this study was to compare the effect of treadmill and overground walking on preferred walking speed, spatiotemporal parameters and foot kinematics in healthy, physically active older and young adults after adequate treadmill familiarization. METHODS: PWS and spatiotemporal parameters were assessed during overground (PWSO) and treadmill (PWST) walking using two wearable inertial sensor systems and were compared between 25 older (72...
July 7, 2017: European Journal of Applied Physiology
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