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Oak trees in Southern U.S. cities are natural urban air filters（图）
Oak trees Southern cities U.S. natural urban air filters
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2019/10/18
Researchers at the University of North Texas have found that two oak tree species, post oak and live oak, that are widespread across the U.S. South remove black carbon from the urban atmosphere. The f...
CHANGE DETECTION VIA SELECTIVE GUIDED CONTRASTING FILTERS
Change Detection Mathematical Morphology Guided filtering
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2017/7/13
Change detection scheme based on guided contrasting was previously proposed. Guided contrasting filter takes two images (test and sample) as input and forms the output as filtered version of test imag...
COMPARISON OF FILTERS DEDICATED TO SPECKLE SUPPRESSION IN SAR IMAGES
SAR Images Radar Images Filtering Mathematical Morphology Speckle Suppression
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2016/11/23
This paper presents the results of research on the effectiveness of different filtering methods dedicated to speckle suppression in SAR images. The tests were performed on RadarSat-2 images and on an ...
LIDAR FILTERING ALGORITHMS FOR URBAN FLOOD APPLICATION: REVIEW ON CURRENT ALGORITHMS AND FILTERS TEST
LiDAR Filtering Algorithm Digital terrain model (DTM) Urban flood modelling Classification Urban Flood
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2016/2/29
Digital terrain model (DTM) is one of the important input parameters in urban flood application. This is because it influences the
flow direction, flow velocity, flood extend and flood depth. LiDAR ...
EFFECTS AND PERFORMANCE OF SPECKLE NOISE REDUCTION FILTERS ON ACTIVE RADAR AND SAR IMAGES
RADAR SAR Images Noise Speckle Filtering Adaptive Filter
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2015/8/17
Reduction of speckle noise is one of the most important processes to increase the quality of radar coherent images. Image variances
or speckle is a granular noise that inherently exists in and degra...
The Effects of Large Ionospheric Gradients on Single Frequency Airborne Smoothing Filters for WAAS and LAAS
Large Ionospheric Gradients Single Frequency Airborne Smoothing Filters WAAS LAAS
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2015/6/26
Both WAAS and LAAS receivers use carrier-smoothing filters to reduce the effects of multipath and thermal noise at the aircraft. For the majority of users this reduces the magnitude of the errors and ...
Double-layer Fano resonance photonic crystal filters
Photonic crystals Optical filters Nanophotonics photonic crystals
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2015/8/7
We report ultra-compact surface-normal high-Q optical filters based on single- and double-layer stacked Fano resonance photonic crystal slabs on both Si and quartz substrates. A single layer photonic ...
Coupled double-layer Fano resonance photonic crystal filters with lattice-displacement
Coupled double-layer Fano resonance photonic crystal filters lattice-displacement
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2015/8/7
We present here ultra-compact high-Q Fano resonance filters with displaced lattices between two coupled photonic crystal slabs, fabricated with crystalline silicon nanomembrane transfer printing...
3-D synthetic aperture radar interferometry phase unwrapping using extended Kalman filters
3-D synthetic aperture radar interferometry phase unwrapping extended Kalman filters
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2014/4/22
Synthetic Aperture Radar Interferometry (InSAR) observations allow researchers to map elevations, analyze surface deformation, and even detect ground water level changes from satellites orbiting the E...
Direct Cadmium Monitoring in Cigarette Filters Leachate by Molecular Fluorescence
Cadmium Traces SPADNS Rhodamine B Molecular Fluorescence Cigarette Filters Leachate
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2013/3/11
This work proposes a new direct flourimetric methodology for cadmium traces quantification based on its association with azo-reagent SPADNS and rhodamine B dye. Experimental variables that influence o...
Transmission Characteristics of Tuneable Optical Filters Using Optical Ring Resonator with PCF Resonance Loop
Optical Ring Resonator Photonic Crystal Fiber Tuneable Optical Filter Optical Fiber
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2013/1/30
A theoretical analysis of a tuneable optical filter is presented by proposing an optical ring resonator (ORR) using photonic crystal fiber (PCF) as the resonance loop. The influences of the characteri...
Reduction of Toxic Pollutants Emitted from Heavy-duty Diesel Vehicles by Deploying Diesel Particulate Filters
Diesel particulate filters PBDEs PCDD/Fs PCBs Heavy-duty diesel vehicles
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2016/3/28
In this study, the emission characteristics of PCDD/Fs, PCBs and PBDEs from heavy-duty diesel vehicles, and the
reduction of these above toxic pollutants by deploying three kinds of diesel particulat...
Dispersion-Compensating Optical Digital Filters for 40-Gb/s Metro Add–Drop Applications
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2011/11/23
Optical digital filters that employ optical delay lines are proposed. Properly locating the zeros in the transfer function is shown to enable interleaver pairs to be designed with the same amplitude r...
Fully Reconfigurable Compact RF Photonic Filters Using High-Q Silicon Microdisk Resonators
Integrated optics devices Wavelength filtering devices.
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2015/5/21
We present a fully reconfigurable fourth-order SOI RF-photonic filter with a tunable bandwidth of 0.9–5 GHz, FSR > 600 GHz, out-of-band rejection > 38 dB, and compact size (0.15 mm 2 ) using high-Q re...
Microwave Photonic Filters with a Directly Generated Gaussian-shaped Optical Frequency Comb
Microwave Photonic Filters Directly Generated Gaussian-shaped Optical Frequency Comb
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2015/5/21
Using electro-optic modulators, we generate a 41-line 10-GHz spaced Gaussian-shaped optical comb. We use this comb to demonstrate apodized microwave photonic filters with greater than 43-dB sidelobe s...