A5053569403- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Soil Moisture and Remote Sensing
- Underwater Acoustics Research
- Marine animal studies overview
- Marine and fisheries research
- Climate change and permafrost
- Underwater Vehicles and Communication Systems
- Precipitation Measurement and Analysis
- Advanced ceramic materials synthesis
- Tracheal and airway disorders
- Geophysical Methods and Applications
- Metal and Thin Film Mechanics
- Distributed and Parallel Computing Systems
- Airway Management and Intubation Techniques
- Antenna Design and Optimization
- Seismic Waves and Analysis
- Head and Neck Surgical Oncology
- Experimental Learning in Engineering
- Radio Wave Propagation Studies
- Musicology and Musical Analysis
- Trauma Management and Diagnosis
- Speech and Audio Processing
- Metal Alloys Wear and Properties
- Surface Roughness and Optical Measurements
The Ohio State University
2016-2024
The University of Texas at Austin
2012-2023
University of Auckland
2020
York Hospital
2019
Lincolnshire Partnership NHS Foundation Trust
2018
California Institute of Technology
2018
DEVCOM Army Research Laboratory
2016-2017
Northeastern University
2005-2014
Metron (United States)
2012
Oak Ridge National Laboratory
1998-2010
Similarities in the behavior of diverse animal species that form large groups have motivated attempts to establish general principles governing group behavior. It has been difficult, however, make quantitative measurements temporal and spatial extensive wild, such as bird flocks, fish shoals, locust swarms. By quantifying formation processes vast oceanic shoals during spawning, we show (i) a rapid transition from disordered highly synchronized occurs population density reaches critical...
From the Department of Surgery, University Toronto, Ontario *Research Fellow, Departemtn Ont. **Associate Professor, Departemnt Toronto and Chief, Thoracic Surgical Division, General Hospital, This Research is supported in part by Cancer Treatment Foundation, Address for Reprints: Dr. F. G. Pearson, Room 120 Wing, 2,
An ultra-wideband radiometer has been developed to measure subsurface properties of the cryosphere including ice sheets and sea ice. The measures brightness temperature spectra from 0.5 2 GHz using 12 channels, each which scene temperatures over an ~88-MHz bandwidth resolved into 0.24-MHz intervals. instrument was flown northwestern Greenland in September 2016 acquired first, wideband, low-frequency sheet coastal region. results reveal strong spatial spectral variations that correlate well...
Ice sheet subsurface temperature is important for understanding glacier dynamics, yet existing methods to obtain the of ice column are limited <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i> sources at present. The ultrawideband software-defined microwave radiometer (UWBRAD) has been developed investigate remote sensing internal temperatures. UWBRAD measures brightness spectra from 0.5 2 GHz using 12 subchannels and employs a...
Microwave radiometry has provided valuable spaceborne observations of Earth's geophysical properties for decades. The recent SMOS, Aquarius, and SMAP satellites have demonstrated the value measurements at 1400 MHz observing surface soil moisture, sea salinity, ice thickness, freeze/thaw state, other variables. However, information obtained is limited by penetration through subsurface a reduced sensitivity to salinity in cold or wind-roughened waters. Recent airborne experiments shown...
The low-frequency target strength of shoaling Atlantic herring (Clupea harengus) in the Gulf Maine during Autumn 2006 spawning season is estimated from experimental data acquired simultaneously at multiple frequencies 300–1200Hz range using (1) a ocean acoustic waveguide remote sensing (OAWRS) system, (2) areal population density calibration with several conventional fish finding sonar (CFFS) systems, and (3) transmission loss measurements. OAWRS system’s instantaneous imaging diameter 100km...
The ultrawideband software-defined microwave radiometer is a 500–2000-MHz developed to probe temperatures inside ice sheets. Given the instrument's operation outside of protected portions spectrum, radio frequency interference (RFI) significant concern, and instrument designed facilitate RFI detection filtering. This paper analyzes design radiometer, accuracy stability brightness it produces, analyses results acquired in its debut flight over northern Canada Greenland September 2016.
Abstract An analysis of 59 cases tracheal stenosis after tracheostomy with cuffed tube and assisted ventilation is reported. Special emphasis placed upon diagnosis treatment. The detection severe strictures usually easily achieved, but mild to moderate degrees may present difficulties in remain undetected for some time. Management the included dilatation (14 cases), segmental resection primary end-to-end anastomosis (34 staged plastic reconstruction (2 permanent (4 cases). No treatment was...
The scintillation statistics of broadband acoustic transmissions are determined as a function signal bandwidth B, center frequency fc, and range with experimental data in the New Jersey continental shelf. received intensity is shown to follow Gamma distribution implying that central limit theorem has led fully saturated field from independent multimodal propagation contributions. depends on mean number statistical fluctuations or coherent cells μ signal. latter calculated for matched filter,...
Carbon soot has been known since antiquity, but recently finding new uses as a robust, inexpensive nanomaterial. This paper describes the superhydrophobic properties of carbon films prepared by combustion candle wax or propane gas and introduces some optical absorption fluorescence particles. Multiple demonstrations, appropriate for variety educational backgrounds, are presented.
An ultrawideband radiometer was used to measure microwave brightness temperature spectra over Arctic sea ice in the Lincoln Sea near north coast of Greenland. Spectra range 0.5-2 GHz were compared thermal infrared images collected during airborne campaign and also nearly concurrent Sentinel-1 C-band synthetic aperture radar (SAR) data. Based on those comparisons, spectral signatures associated with thick multiyear thin ice. A radiative transfer (RT) model consisting a homogeneous slab...
The Cubesat radiometer radio frequency interference technology validation mission (CubeRRT) was developed to demonstrate real-time onboard detection and filtering of (RFI) for wide bandwidth microwave radiometers. CubeRRT's key is its digital backend (RDB) that capable measuring an instantaneous 1 GHz the input signal into estimated total power with without RFI contributions. processing capability dramatically reduces volume data must be downlinked ground eliminates need ground-based...
Airborne 500–2000-MHz radiometric measurements recorded in high-latitude regions (portions of Greenland, Antarctica, and Northern Canada) are used to provide insight into the radio frequency interference (RFI) environment that can be expected for future radiometer missions operating this range. Statistics RFI reported terms likelihood a specified bandwidth measurement containing corruption. The results indicate wideband radiometry from 500 2000 MHz is viable science applications majority surveyed.
Abstract Observations are reported from a 3-year prospective study of tracheal injury occurring in patients managed by cuffed-tube tracheostomy and assisted ventilation the Respiratory Failure Unit at Toronto General Hospital. When cuffed tube was finally removed an initial bronchoscopic examination trachea performed. Further clinical radiological assessments were made 3 weeks months later, using bronchoscopy when indicated. The incidence symptomatic stenosis 153 studied 21 per cent. Of...
An ocean acoustic waveguide remote sensing system can instantaneously image and continuously monitor fish populations distributed over continental shelf-scale regions. Here it is shown theoretically that the areal population density of groups be estimated from their incoherently averaged broadband matched filtered scattered intensities measured using a with less than 10% error. A numerical Monte-Carlo model developed to determine statistical moments returns group. It uses parabolic equation...
Aim Improving timely access to evidence‐based treatment for people aged 14‐65 years experiencing a first episode psychosis (FEP) or an at‐risk mental state (ARMS) is national priority within the United Kingdom. An early intervention in (EIP) and waiting time standard has been set which extended age range acceptance criteria services. Methods This descriptive evaluation reports upon referrals times EIP service over year of operating line with standard. Patient pathways post‐assessment status...
Measurements of the 500–2000-MHz brightness temperature spectra Antarctica acquired under Ice Sheet and Sea Ultrawideband Microwave Airborne eXperiment (ISSIUMAX) are reported. These data sets support remote sensing ice sheet properties, in particular information on profile within sheet. The Software-Defined Radiometer (UWBRAD) was installed a Twin Otter aircraft, measurements were collected coastal areas interior East November December 2018. UWBRAD along 1000-km path over compared this...
An analytic model is developed for scattering from random inhomogeneities in range-dependent ocean waveguides using the Rayleigh–Born approximation to Green’s theorem. The expected scattered intensity depends on statistical moments of fractional changes compressibility and density, which scatter as monopoles dipoles, respectively, coherence volume inhomogeneities. calibrated bottom data acquired by instantaneous wide-area acoustic waveguide remote sensing (OAWRS) geophysical surveys ONR...
The probability distribution of ocean-acoustic broadband signal energy after saturated multipath propagation is derived using coherence theory. frequency components obtained from Fourier decomposition a are each assumed to be fully with spectral density that obey the exponential 5.6 dB standard deviation and unity scintillation index. When bandwidth measurement time larger than correlation time, respectively, its components, by integrating across then follows Gamma smaller index less unity....
The Ultra-wideband Software Defined Radiometer (UWBRAD) for ice sheet internal temperature sensing is designed to provide observations of brightness temperatures from 500-2000 MHz. This presentation reports on current status the instrument development, experimental results obtained date, and plans a September 2016 airborne deployment over Greenland.
Abstract. An airborne microwave wide-band radiometer (500–2000 MHz) was operated for the first time in Antarctica to better understand emission properties of sea ice, outlet glaciers and interior ice sheet from Terra Nova Bay Dome C. The different glaciological regimes were revealed exhibit unique spectral signatures this portion spectrum. Generally, brightness temperatures over a vertically homogeneous are warmest at lowest frequencies, consistent with models that predict those channels...
The CubeSat Radiometer Radio Frequency Interference Technology Validation (CubeRRT) mission is developing a 6U system to demonstrate radio frequency interference (RFI) detection and mitigation technologies for future microwave radiometer remote sensing missions. CubeRRT will perform observations of Earth brightness temperatures from 6-40 GHz using 1 bandwidth tuned channel, on-board real-time RFI processing. currently under development, with launch readiness expected in 2018 followed by one...
The matched filter enables imaging with high spatial resolution and signal-to-noise ratio by coherent correlation the expected field from what is assumed to be a discrete scatterer. In many physical systems, however, returns large number of randomized scatterers, ranging thousands millions individuals, are received together or vanishes. Despite this, it shown that cross-spectral coherence in filtered variance retains pulse compression property high-resolution scatterer population density....