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https://www.readbyqxmd.com/read/28106090/broadband-and-broad-angle-polarization-independent-metasurface-for-radar-cross-section-reduction
#1
Hengyi Sun, Changqing Gu, Xinlei Chen, Zhuo Li, Liangliang Liu, Bingzheng Xu, Zicheng Zhou
In this work, a broadband and broad-angle polarization-independent random coding metasurface structure is proposed for radar cross section (RCS) reduction. An efficient genetic algorithm is utilized to obtain the optimal layout of the unit cells of the metasurface to get a uniform backscattering under normal incidence. Excellent agreement between the simulation and experimental results show that the proposed metasurface structure can significantly reduce the radar cross section more than 10 dB from 17 GHz to 42 GHz when the angle of incident waves varies from 10° to 50°...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28103148/double-whammy-adverse-childhood-events-and-pain-reflect-symptomology-and-quality-of-life-in-women-in-substance-abuse-treatment
#2
Cheryl Zlotnick, Maayan Lawental, Dorit Pud
BACKGROUND: This study examined the profiles of symptoms and health-related quality of life (QOL) of women in substance abuse treatment, comparing those with higher versus lower histories of adverse childhood events (ACE), and those with versus without current pain. METHODS: Adult women in outpatient substance abuse treatment (n = 30) completed questionnaires (cross-sectional study) on topics including drug use, adverse childhood events (ACE), QOL, functional ability, current pain, and depression...
January 19, 2017: Social Work in Health Care
https://www.readbyqxmd.com/read/28102898/a-composite-autonomic-index-as-unitary-metric-for-heart-rate-variability-a-proof-of-concept
#3
Roberto Sala, Mara Malacarne, Nadia Solaro, Massimo Pagani, Daniela Lucini
BACKGROUND: This study addresses whether a unitary cardiac autonomic nervous system index (ANSI), obtained combining multiple metrics from Heart Rate Variability (HRV) into a radar plot could provide an easy appreciation of autonomic performance in a clinical setting. MATERIALS AND METHODS: Data are standardized using percentile ranking of autonomic proxies from a relatively large reference population (n= 1593, age 39±13 years). Autonomic indices are obtained from autoregressive spectral analysis of (ECG derived) HRV at rest and during standing up...
January 19, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28091883/ground-penetrating-radar-gpr-responses-for-sub-surface-salt-contamination-and-solid-waste-modeling-and-controlled-lysimeter-studies
#4
Y N S Wijewardana, A T Shilpadi, M I M Mowjood, K Kawamoto, L W Galagedara
The assessment of polluted areas and municipal solid waste (MSW) sites using non-destructive geophysical methods is timely and much needed in the field of environmental monitoring and management. The objectives of this study are (i) to evaluate the ground-penetrating radar (GPR) wave responses as a result of different electrical conductivity (EC) in groundwater and (ii) to conduct MSW stratification using a controlled lysimeter and modeling approach. A GPR wave simulation was carried out using GprMax2D software, and the field test was done on two lysimeters that were filled with sand (Lysimeter-1) and MSW (Lysimeter-2)...
February 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28088513/an-immunogram-for-the-cancer-immunity-cycle-towards-personalized-immunotherapy-of-lung-cancer
#5
Takahiro Karasaki, Kazuhiro Nagayama, Hideki Kuwano, Jun-Ichi Nitadori, Masaaki Sato, Masaki Anraku, Akihiro Hosoi, Hirokazu Matsushita, Yasuyuki Morishita, Kosuke Kashiwabara, Masaki Takazawa, Osamu Ohara, Kazuhiro Kakimi, Jun Nakajima
INTRODUCTION: The interaction of immune cells and cancer cells shapes the immunosuppressive tumor microenvironment. For successful cancer immunotherapy, comprehensive knowledge of anti-tumor immunity as a dynamic spacio-temporal process is required for each individual patient. To this end, we developed an immunogram for the cancer-immunity cycle using next-generation sequencing. METHODS: Whole-exome sequencing and RNA-Seq was performed in 20 non-small cell lung cancer patients (12 adenocarcinoma, 7 squamous cell carcinoma, and 1 large cell neuroendocrine carcinoma)...
January 11, 2017: Journal of Thoracic Oncology
https://www.readbyqxmd.com/read/28076444/wiseeye-next-generation-expandable-and-programmable-camera-trap-platform-for-wildlife-research
#6
Sajid Nazir, Scott Newey, R Justin Irvine, Fabio Verdicchio, Paul Davidson, Gorry Fairhurst, René van der Wal
The widespread availability of relatively cheap, reliable and easy to use digital camera traps has led to their extensive use for wildlife research, monitoring and public outreach. Users of these units are, however, often frustrated by the limited options for controlling camera functions, the generation of large numbers of images, and the lack of flexibility to suit different research environments and questions. We describe the development of a user-customisable open source camera trap platform named 'WiseEye', designed to provide flexible camera trap technology for wildlife researchers...
2017: PloS One
https://www.readbyqxmd.com/read/28075367/high-performance-anti-retransmission-deception-jamming-utilizing-range-direction-multiple-input-and-multiple-output-mimo-synthetic-aperture-radar-sar
#7
Ruijia Wang, Jie Chen, Xing Wang, Bing Sun
Retransmission deception jamming seriously degrades the Synthetic Aperture Radar (SAR) detection efficiency and can mislead SAR image interpretation by forming false targets. In order to suppress retransmission deception jamming, this paper proposes a novel multiple input and multiple output (MIMO) SAR structure range direction MIMO SAR, whose multiple channel antennas are vertical to the azimuth. First, based on the multiple channels of range direction MIMO SAR, the orthogonal frequency division multiplexing (OFDM) linear frequency modulation (LFM) signal was adopted as the transmission signal of each channel, which is defined as a sub-band signal...
January 9, 2017: Sensors
https://www.readbyqxmd.com/read/28075348/a-novel-monopulse-technique-for-adaptive-phased-array-radar
#8
Xinyu Zhang, Yang Li, Xiaopeng Yang, Le Zheng, Teng Long, Christopher J Baker
The monopulse angle measuring technique is widely adopted in radar systems due to its simplicity and speed in accurately acquiring a target's angle. However, in a spatial adaptive array, beam distortion, due to adaptive beamforming, can result in serious deterioration of monopulse performance. In this paper, a novel constrained monopulse angle measuring algorithm is proposed for spatial adaptive arrays. This algorithm maintains the ability to suppress the unwanted signals without suffering from beam distortion...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28075345/software-defined-doppler-radar-as-a-contactless-multipurpose-microwave-sensor-for-vibrations-monitoring
#9
Antonio Raffo, Sandra Costanzo, Giuseppe Di Massa
A vibration sensor based on the use of a Software-Defined Radio (SDR) platform is adopted in this work to provide a contactless and multipurpose solution for low-cost real-time vibrations monitoring. In order to test the vibration detection ability of the proposed non-contact method, a 1 GHz Doppler radar sensor is simulated and successfully assessed on targets at various distances, with various oscillation frequencies and amplitudes. Furthermore, an SDR Doppler platform is practically realized, and preliminary experimental validations on a device able to produce a harmonic motion are illustrated to prove the effectiveness of the proposed approach...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28075343/a-fast-synthetic-aperture-radar-raw-data-simulation-using-cloud-computing
#10
Zhixin Li, Dandan Su, Haijiang Zhu, Wei Li, Fan Zhang, Ruirui Li
Synthetic Aperture Radar (SAR) raw data simulation is a fundamental problem in radar system design and imaging algorithm research. The growth of surveying swath and resolution results in a significant increase in data volume and simulation period, which can be considered to be a comprehensive data intensive and computing intensive issue. Although several high performance computing (HPC) methods have demonstrated their potential for accelerating simulation, the input/output (I/O) bottleneck of huge raw data has not been eased...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28073791/rapid-deployment-aortic-replacement-radar-registry-in-spain-a-protocol
#11
Victor Bautista-Hernandez, Natalia Cal-Purriños, Jose M Arribas-Leal, Manuel Carnero-Alcazar, Jose F Gutierrez-Diez, Jose J Cuenca-Castillo
INTRODUCTION: Rapid deployment valves (RDV) represent a newly introduced approach to aortic valve replacement which facilitates surgical implantation and minimally invasive techniques, shortens surgical times and shows excellent haemodynamic performance. However, evidence on their safety, efficacy and potential complications is mostly fitted with small-volume and retrospective studies. Moreover, no current guidelines exist. To improve our knowledge on this technology, The Rapid Deployment Aortic Replacement (RADAR) Registry will be established across Spain with the aim of assessing RDV outcomes in the real-world setting...
January 10, 2017: BMJ Open
https://www.readbyqxmd.com/read/28068247/modeling-urinary-dysfunction-after-external-beam-radiation-therapy-of-the-prostate-using-bladder-dose-surface-maps-evidence-of-spatially-variable-response-of-the-bladder-surface
#12
Noorazrul Yahya, Martin A Ebert, Michael J House, Angel Kennedy, John Matthews, David J Joseph, James W Denham
PURPOSE: We assessed the association of the spatial distribution of dose to the bladder surface, described using dose-surface maps, with the risk of urinary dysfunction. METHODS AND MATERIALS: The bladder dose-surface maps of 754 participants from the TROG 03.04-RADAR trial were generated from the volumetric data by virtually cutting the bladder at the sagittal slice, intersecting the bladder center-of-mass through to the bladder posterior and projecting the dose information on a 2-dimensional plane...
February 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28067242/submesoscale-transition-from-geostrophic-flows-to-internal-waves-in-the-northwestern-pacific-upper-ocean
#13
Bo Qiu, Toshiya Nakano, Shuiming Chen, Patrice Klein
With radar interferometry, the next-generation Surface Water and Ocean Topography satellite mission will improve the measured sea surface height resolution down to 15 km, allowing us to investigate for the first time the global upper ocean variability at the submesoscale range. Here, by analysing shipboard Acoustic Doppler Current Profiler measurements along 137°E in the northwest Pacific of 2004-2016, we show that the observed upper ocean velocities are comprised of balanced geostrophic flows and unbalanced internal waves...
January 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28059390/development-of-a-multiple-field-of-view-multiple-scattering-polarization-lidar-comparison-with-cloud-radar
#14
Hajime Okamoto, Kaori Sato, Tomoaki Nishizawa, Nobuo Sugimoto, Toshiyuki Makino, Yoshitaka Jin, Atsushi Shimizu, Toshiaki Takano, Masahiro Fujikawa
We developed a multiple-field-of-view multiple-scattering polarization lidar (MFMSPL) to study the microphysics of optically thick clouds. Designed to measure enhanced backscattering and depolarization ratio comparable to space-borne lidar, the system consists of four sets of parallel and perpendicular channels mounted with different zenith angles. Depolarization ratios from water clouds were large as observed by MFMSPL compared to those observed by conventional lidar. Cloud top heights and depolarization ratios tended to be larger for outer MFMSPL channels than for vertically pointing channels...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059191/high-peak-power-cavity-dumping-semiconductor-lasers
#15
Joshua Myers, Chris Kokoczka, Gary Cook, Robert Bedford
We report on the development of a nanosecond pulsed kW-class optically pumped InGaAs semiconductor laser emitting around 1020 nm, which is suitable for applications such as incoherent laser radar, nonlinear optics, and materials processing. Using an intracavity Pockels cell to cavity-dump VECSELs, we are able to access large pulse energies by storing energy in the optical cavity rather than in the gain medium. We demonstrate peak powers >1  kW and 3 μJ pulses, show the pulse length is equivalent to the photon round-trip time, and show that the wavelength can be tuned within the gain bandwidth of the semiconductor gain...
January 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28059176/spatially-localized-see-through-wall-temperature-measurements-in-a-flow-reactor-using-radar-rempi
#16
Yue Wu, Mark Gragston, Zhili Zhang, Joseph D Miller
See-through-wall coherent microwave scattering from resonance-enhanced multiphoton ionization (REMPI) for rotational temperature measurements of molecular oxygen has been developed and demonstrated in a flow reactor at atmospheric pressure. Through limited, single-ended optical access, a laser beam was focused to generate local ionization of molecular oxygen in a heated quartz flow reactor enclosed by ceramic heating elements. Coherent microwaves were transmitted, and the subsequent scattering off the laser-induced plasma was received, through the optically opaque ceramic heater walls and used to acquire rotational spectra of molecular oxygen and to determine temperature...
January 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28054962/cosmo-skymed-image-investigation-of-snow-features-in-alpine-environment
#17
Simonetta Paloscia, Simone Pettinato, Emanuele Santi, Mauro Valt
In this work, X band images acquired by COSMO-SkyMed (CSK) on alpine environment have been analyzed for investigating snow characteristics and their effect on backscattering variations. Preliminary results confirmed the capability of simultaneous optical and Synthetic Aperture Radar (SAR) images (Landsat-8 and CSK) in separating snow/no-snow areas and in detecting wet snow. The sensitivity of backscattering to snow depth has not always been confirmed, depending on snow characteristics related to the season...
January 4, 2017: Sensors
https://www.readbyqxmd.com/read/28052499/ecosystem-carbon-density-and-allocation-across-a-chronosequence-of-longleaf-pine-forests
#18
Lisa J Samuelson, Thomas A Stokes, John R Butnor, Kurt H Johnsen, Carlos A Gonzalez-Benecke, Timothy A Martin, Wendell P Cropper, Pete H Anderson, Michael R Ramirez, John C Lewis
Forests can partially offset greenhouse gas emissions and contribute to climate change mitigation, mainly through increases in live biomass. We quantified carbon (C) density in 20 managed longleaf pine (Pinus palustris Mill.) forests ranging in age from 5 to 118 years located across the southeastern United States and estimated above- and belowground C trajectories. Ecosystem C stock (all pools including soil C) and aboveground live tree C increased nonlinearly with stand age and the modeled asymptotic maxima were 168 Mg C/ha and 80 Mg C/ha, respectively...
January 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28052055/penitentes-as-the-origin-of-the-bladed-terrain-of-tartarus-dorsa-on-pluto
#19
John E Moores, Christina L Smith, Anthony D Toigo, Scott D Guzewich
Penitentes are snow and ice features formed by erosion that, on Earth, are characterized by bowl-shaped depressions several tens of centimetres across, whose edges grade into spires up to several metres tall. Penitentes have been suggested as an explanation for anomalous radar data on Europa, but until now no penitentes have been identified conclusively on planetary bodies other than Earth. Regular ridges with spacings of 3,000 to 5,000 metres and depths of about 500 metres with morphologies that resemble penitentes have been observed by the New Horizons spacecraft in the Tartarus Dorsa region of Pluto (220°-250° E, 0°-20° N)...
January 4, 2017: Nature
https://www.readbyqxmd.com/read/28051333/optimal-loading-for-maximising-power-during-sled-resisted-sprinting
#20
Matt R Cross, Matt Brughelli, Pierre Samozino, Scott R Brown, Jean-Benoit Morin
Purpose We sought to ascertain whether force-velocity-power relationships could be compiled from a battery of sled-resisted over-ground sprints, and to clarify and compare the optimal loading conditions for maximising power production for different athlete cohorts. Methods Recreational mixed-sport athletes (n=12) and sprinters (n=15) performed multiple trials of maximal sprints unloaded and towing a selection of sled masses (20-120% body-mass). Velocity data were collected by sports radar, and kinetics at peak velocity were quantified using friction coefficients and aerodynamic drag...
January 4, 2017: International Journal of Sports Physiology and Performance
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