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https://www.readbyqxmd.com/read/28729909/biological-effects-and-mechanisms-of-shortwave-radiation-a-review
#1
REVIEW
Chao Yu, Rui-Yun Peng
With the increasing knowledge of shortwave radiation, it is widely used in wireless communications, radar observations, industrial manufacturing, and medical treatments. Despite of the benefits from shortwave, these wide applications expose humans to the risk of shortwave electromagnetic radiation, which is alleged to cause potential damage to biological systems. This review focused on the exposure to shortwave electromagnetic radiation, considering in vitro, in vivo and epidemiological results that have provided insight into the biological effects and mechanisms of shortwave...
2017: Military Medical Research
https://www.readbyqxmd.com/read/28727550/isar-imaging-of-high-speed-maneuvering-target-using-gapped-stepped-frequency-waveform-and-compressive-sensing
#2
Min-Seok Kang, Seung-Jae Lee, Seong-Hyeon Lee, Kyung-Tae Kim
In the case of a stepped-frequency waveform (SFW) inverse synthetic aperture radar (ISAR) system, the translational motion (TM) of a target can be usually divided into two parts: 1) target motion within a pulse repetition interval (PRI), called the inter-pulse translational motion (IPTM) and 2) target motion between bursts, called the inter-burst translational motion (IBTM). The former induces severe blurring in the ISAR images as well as range-compressed data (i.e., range profile), and the latter also causes dramatic degradation of the ISAR image quality...
July 17, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28726751/an-adaptive-feature-learning-model-for-sequential-radar-high-resolution-range-profile-recognition
#3
Xuan Peng, Xunzhang Gao, Yifan Zhang, Xiang Li
This paper proposes a new feature learning method for the recognition of radar high resolution range profile (HRRP) sequences. HRRPs from a period of continuous changing aspect angles are jointly modeled and discriminated by a single model named the discriminative infinite restricted Boltzmann machine (Dis-iRBM). Compared with the commonly used hidden Markov model (HMM)-based recognition method for HRRP sequences, which requires efficient preprocessing of the HRRP signal, the proposed method is an end-to-end method of which the input is the raw HRRP sequence, and the output is the label of the target...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28720892/dual-band-wide-angle-metamaterial-perfect-absorber-based-on-the-combination-of-localized-surface-plasmon-resonance-and-helmholtz-resonance
#4
Changlei Zhang, Cheng Huang, Mingbo Pu, Jiakun Song, Zeyu Zhao, Xiaoyu Wu, Xiangang Luo
In this article, a dual-band wide-angle metamaterial perfect absorber is proposed to achieve absorption at the wavelength where laser radar operates. It is composed of gold ring array and a Helmholtz resonance cavity spaced by a Si dielectric layer. Numerical simulation results reveal that the designed absorber displays two absorption peaks at the target wavelength of 10.6 μm and 1.064 μm with the large frequency ratio and near-unity absorptivity under the normal incidence. The wide-angle absorbing property and the polarization-insensitive feature are also demonstrated...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720628/the-patient-centered-medical-home-pcmh-framing-typology-for-understanding-the-structure-function-and-outcomes-of-pcmhs
#5
Autumn M Kieber-Emmons, William L Miller
INTRODUCTION: Patient-centered medical homes (PCHMs) aspire to transform today's challenged primary care services. However, it is unclear which PCMH characteristics produce specific outcomes of interest for care delivery. This study tested a novel typology of PCMH practice transformation, the PCMH framing typology, and evaluated measurable outcomes by each type. METHODS: Using the Patient-Centered Primary Care Collaborative 2012 to 2013 Annual Review, this secondary analysis of the published PCMH literature extracted data from publications of 59 PCMHs...
July 2017: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28717998/locust-displacing-winds-in-eastern-australia-reassessed-with-observations-from-an-insect-monitoring-radar
#6
Zhenhua Hao, V Alistair Drake, Leesa Sidhu, John R Taylor
Based on previous investigations, adult Australian plague locusts are believed to migrate on warm nights (with evening temperatures >25 °C), provided daytime flight is suppressed by surface winds greater than the locusts' flight speed, which has been shown to be 3.1 m s(-1). Moreover, adult locusts are believed to undertake briefer 'dispersal' flights on nights with evening temperature >20 °C. To reassess the utility of these conditions for forecasting locust flight, contingency tests were conducted comparing the nights selected on these bases (predicted nights) for the months of November, January, and March and the nights when locust migration were detected with an insect monitoring radar (actual nights) over a 7-year period...
July 17, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28710446/the-movement-of-small-insects-in-the-convective-boundary-layer-linking-patterns-to-processes
#7
Charlotte E Wainwright, Phillip M Stepanian, Don R Reynolds, Andy M Reynolds
In fine warm weather, the daytime convective atmosphere over land areas is full of small migrant insects, among them serious pests (e.g. some species of aphid), but also many beneficial species (e.g. natural enemies of pests). For many years intensive aerial trapping studies were the only way of determining the density profiles of these small insects, and for taxon-specific studies trapping is still necessary. However, if we wish to determine generic behavioural responses to air movements shown by small day-migrating insects as a whole, the combination of millimetre-wavelength 'cloud radars' and Doppler lidar now provides virtually ideal instrumentation...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28708158/silicon-microring-modulator-based-rf-mixer-for-millimeter-wave-phase-coded-signal-generation
#8
Yiwei Xie, Leimeng Zhuang, Arthur James Lowery
Phase-coded radio frequency (RF) pulses are widely adopted for radar systems as an effective signal format to enable high-range resolution. However, generating such signals conventionally requires high-speed electronics and complex RF circuitry that impose burdens on the system cost and power consumption. In particular, modern radar systems desire features such as high frequencies, e.g., in the millimeter-wave region, high compactness, and high system flexibility, which pose great challenges for the conventional all-electronics solutions...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28695200/room-temperature-high-detectivity-mid-infrared-photodetectors-based-on-black-arsenic-phosphorus
#9
Mingsheng Long, Anyuan Gao, Peng Wang, Hui Xia, Claudia Ott, Chen Pan, Yajun Fu, Erfu Liu, Xiaoshuang Chen, Wei Lu, Tom Nilges, Jianbin Xu, Xiaomu Wang, Weida Hu, Feng Miao
The mid-infrared (MIR) spectral range, pertaining to important applications, such as molecular "fingerprint" imaging, remote sensing, free space telecommunication, and optical radar, is of particular scientific interest and technological importance. However, state-of-the-art materials for MIR detection are limited by intrinsic noise and inconvenient fabrication processes, resulting in high-cost photodetectors requiring cryogenic operation. We report black arsenic phosphorus-based long-wavelength IR photodetectors, with room temperature operation up to 8...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28690790/recent-upgrades-of-the-harmonic-radar-for-the-tracking-of-the-asian-yellow-legged-hornet
#10
Daniele Milanesio, Maurice Saccani, Riccardo Maggiora, Daniela Laurino, Marco Porporato
The yellow-legged Asian hornet is an invasive species of wasps, indigenous of the South-East Asia but quickly spreading in Southern Europe. Because of its exponential diffusion and its serious threat to the local honey bee colonies and to humans as well, restraint measures are under investigation. Among them, the harmonic radar described in (Ecology and Evolution, 6, 2016 and 2170) already proved to be a quite effective way to follow the hornets to their nests; it is in fact capable of tracking the flying trajectory of these insects, once equipped with a small transponder, in their natural environment...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28690786/remote-sensing-based-landscape-indicators-for-the-evaluation-of-threatened-bird-habitats-in-a-tropical-forest
#11
Minerva Singh, Timo Tokola, Zhengyang Hou, Claudia Notarnicola
Avian species persistence in a forest patch is strongly related to the degree of isolation and size of a forest patch and the vegetation structure within a patch and its matrix are important predictors of bird habitat suitability. A combination of space-borne optical (Landsat), ALOS-PALSAR (radar), and airborne Light Detection and Ranging (LiDAR) data was used for assessing variation in forest structure across forest patches that had undergone different levels of forest degradation in a logged forest-agricultural landscape in Southern Laos...
July 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28687741/insar-constraints-on-soil-moisture-evolution-after-the-march-2015-extreme-precipitation-event-in-chile
#12
C P Scott, R B Lohman, T E Jordan
Constraints on soil moisture can guide agricultural practices, act as input into weather, flooding and climate models and inform water resource policies. Space-based interferometric synthetic aperture radar (InSAR) observations provide near-global coverage, even in the presence of clouds, of proxies for soil moisture derived from the amplitude and phase content of radar imagery. We describe results from a 1.5 year-long InSAR time series spanning the March, 2015 extreme precipitation event in the hyperarid Atacama desert of Chile, constraining the immediate increase in soil moisture and drying out over the following months, as well as the response to a later, smaller precipitation event...
July 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28686198/towards-a-cognitive-radar-canada-s-third-generation-high-frequency-surface-wave-radar-hfswr-for-surveillance-of-the-200-nautical-mile-exclusive-economic-zone
#13
Anthony Ponsford, Rick McKerracher, Zhen Ding, Peter Moo, Derek Yee
Canada's third-generation HFSWR forms the foundation of a maritime domain awareness system that provides enforcement agencies with real-time persistent surveillance out to and beyond the 200 nautical mile exclusive economic zone (EEZ). Cognitive sense-and-adapt technology and dynamic spectrum management ensures robust and resilient operation in the highly congested High Frequency (HF) band. Dynamic spectrum access enables the system to simultaneously operate on two frequencies on a non-interference and non-protected basis, without impacting other spectrum users...
July 7, 2017: Sensors
https://www.readbyqxmd.com/read/28677622/a-frequency-domain-adaptive-matched-filter-for-active-sonar-detection
#14
Zhishan Zhao, Anbang Zhao, Juan Hui, Baochun Hou, Reza Sotudeh, Fang Niu
The most classical detector of active sonar and radar is the matched filter (MF), which is the optimal processor under ideal conditions. Aiming at the problem of active sonar detection, we propose a frequency-domain adaptive matched filter (FDAMF) with the use of a frequency-domain adaptive line enhancer (ALE). The FDAMF is an improved MF. In the simulations in this paper, the signal to noise ratio (SNR) gain of the FDAMF is about 18.6 dB higher than that of the classical MF when the input SNR is -10 dB. In order to improve the performance of the FDAMF with a low input SNR, we propose a pre-processing method, which is called frequency-domain time reversal convolution and interference suppression (TRC-IS)...
July 4, 2017: Sensors
https://www.readbyqxmd.com/read/28675672/multi-date-multi-sensor-remote-sensing-reveals-high-density-of-carbon-rich-mountain-peatlands-in-the-p%C3%A3-ramo-of-ecuador
#15
John A Hribljan, Esteban Suarez, Laura Bourgeau-Chavez, Sarah Endres, Erik A Lilleskov, Segundo Chimbolema, Craig Wayson, Eleanor Serocki, Rodney A Chimner
Tropical peatlands store a significant portion of the global soil carbon (C) pool. However, tropical mountain peatlands contain extensive peat soils that have yet to be mapped or included in global C estimates. This lack of data hinders our ability to inform policy and apply sustainable management practices to these peatlands that are experiencing unprecedented high rates of land use and land cover change. Rapid large scale mapping activities are urgently needed to quantify tropical wetland extent and rate of degradation...
July 4, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28674694/visualization-of-global-disease-burden-for-the-optimization-of-patient-management-and-treatment
#16
Winfried Schlee, Deborah A Hall, Niklas K Edvall, Berthold Langguth, Barbara Canlon, Christopher R Cederroth
BACKGROUND: The assessment and treatment of complex disorders is challenged by the multiple domains and instruments used to evaluate clinical outcome. With the large number of assessment tools typically used in complex disorders comes the challenge of obtaining an integrative view of disease status to further evaluate treatment outcome both at the individual level and at the group level. Radar plots appear as an attractive visual tool to display multivariate data on a two-dimensional graphical illustration...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28672830/a-novel-range-compression-algorithm-for-resolution-enhancement-in-gnss-sars
#17
Yu Zheng, Yang Yang, Wu Chen
In this paper, a novel range compression algorithm for enhancing range resolutions of a passive Global Navigation Satellite System-based Synthetic Aperture Radar (GNSS-SAR) is proposed. In the proposed algorithm, within each azimuth bin, firstly range compression is carried out by correlating a reflected GNSS intermediate frequency (IF) signal with a synchronized direct GNSS base-band signal in the range domain. Thereafter, spectrum equalization is applied to the compressed results for suppressing side lobes to obtain a final range-compressed signal...
June 25, 2017: Sensors
https://www.readbyqxmd.com/read/28672813/a-spaceborne-synthetic-aperture-radar-partial-fixed-point-imaging-system-using-a-field-programmable-gate-array-application-specific-integrated-circuit-hybrid-heterogeneous-parallel-acceleration-technique
#18
Chen Yang, Bingyi Li, Liang Chen, Chunpeng Wei, Yizhuang Xie, He Chen, Wenyue Yu
With the development of satellite load technology and very large scale integrated (VLSI) circuit technology, onboard real-time synthetic aperture radar (SAR) imaging systems have become a solution for allowing rapid response to disasters. A key goal of the onboard SAR imaging system design is to achieve high real-time processing performance with severe size, weight, and power consumption constraints. In this paper, we analyse the computational burden of the commonly used chirp scaling (CS) SAR imaging algorithm...
June 24, 2017: Sensors
https://www.readbyqxmd.com/read/28663845/reduction-of-frame-rate-in-full-field-swept-source-optical-coherence-tomography-by-numerical-motion-correction-invited
#19
Clara Pfäffle, Hendrik Spahr, Dierck Hillmann, Helge Sudkamp, Gesa Franke, Peter Koch, Gereon Hüttmann
Full-field swept-source optical coherence tomography (FF-SS-OCT) was recently shown to allow new and exciting applications for imaging the human eye that were previously not possible using current scanning OCT systems. However, especially when using cameras that do not acquire data with hundreds of kHz frame rate, uncorrected phase errors due to axial motion of the eye lead to a drastic loss in image quality of the reconstructed volumes. Here we first give a short overview of recent advances in techniques and applications of parallelized OCT and finally present an iterative and statistical algorithm that estimates and corrects motion-induced phase errors in the FF-SS-OCT data...
March 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28653782/changes-in-drug-use-patterns-reported-on-the-web-after-the-introduction-of-adf-oxycontin-findings-from-the-researched-abuse-diversion-and-addiction-related-surveillance-radars-system-web-monitoring-program
#20
Suzanne Vosburg, Colleen Haynes, Andrea Besharat, Jody L Green
This qualitative study summarizes information that individuals shared online about use of OxyContin following the August 2010 introduction of the abuse deterrent formulation (ADF). PURPOSE: The primary objective was to study online posts that endorsed continued use of OxyContin or a switch from OxyContin to another formulation of oxycodone or another substance altogether following the introduction of the ADF. A secondary objective was to determine whether posts revealed that the ADF led to cessation of OxyContin use...
June 27, 2017: Pharmacoepidemiology and Drug Safety
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