A5071248940- Infrared Target Detection Methodologies
- Calibration and Measurement Techniques
- Cosmology and Gravitation Theories
- Thermography and Photoacoustic Techniques
- Spectroscopy and Chemometric Analyses
- Organizational Management and Innovation
- Advanced Measurement and Detection Methods
- Spectroscopy Techniques in Biomedical and Chemical Research
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- CCD and CMOS Imaging Sensors
- High-Energy Particle Collisions Research
- Scientific Research and Discoveries
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Image Processing Techniques and Applications
- Infrared Thermography in Medicine
- Public Health and Social Inequalities
- Galaxies: Formation, Evolution, Phenomena
- Advanced Image Fusion Techniques
- Geophysics and Gravity Measurements
- Water Quality Monitoring Technologies
- Astronomy and Astrophysical Research
- Advanced Chemical Sensor Technologies
- Astronomical Observations and Instrumentation
University of Concepción
2015-2024
Westlake University
2023
Centro Tecnológico del Mar
2022
Pontificia Universidad Javeriana
2004-2013
Lockheed Martin (United States)
2013
University of New Mexico
2013
Universidad Católica Silva Henríquez
2008
The University of Texas at Austin
2006
New Mexico State University
2005
National Radio Astronomy Observatory
2004
Two years of microwave background observations with the Cosmic Background Imager (CBI) have been combined to give a sensitive, high resolution angular power spectrum over range 400 < l 3500. This has referenced more accurate overall calibration derived from WMAP. The data cover 90 deg^2 including three pointings targeted for deep observations. uncertainty on > 2000 previously seen CBI is reduced. Under assumption that any signal in excess primary anisotropy due secondary...
Polarization observations of the cosmic microwave background with Cosmic Background Imager from September 2002 to May 2004 provide a significant detection E-mode polarization and reveal an angular power spectrum polarized emission showing peaks valleys that are shifted in phase by half cycle relative those total intensity spectrum. This key agreement between observed predicted on basis provides support for standard model cosmology, which dark matter energy dominant constituents, geometry is...
view Abstract Citations (225) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Preliminary Results from the COBE Differential Microwave Radiometers: Large Angular Scale Isotropy of Cosmic Background Smoot, G. F. ; Bennett, C. L. Kogut, A. Aymon, J. Backus, de Amici, Galuk, K. Jackson, P. D. Keegstra, Rokke, Tenorio, Torres, S. Gulkis, Hauser, M. Janssen, Mather, Weiss, R. Wilkinson, T. Wright, E. Boggess, N. W. Cheng, Kelsall, Lubin, Meyer,...
A novel statistical approach is undertaken for the adaptive estimation of gain and bias nonuniformity in infrared focal-plane array sensors from scene data. The each detector are regarded as random state variables modeled by a discrete-time Gauss-Markov process. proposed framework provides mechanism capturing slow drift fixed-pattern noise operational conditions sensor vary time. With temporal stochastic model detector's at hand, Kalman filter derived that uses data, comprising readout...
A statistical algorithm has been developed to compensate for the fixed-pattern noise associated with spatial nonuniformity and temporal drift in response of focal-plane array infrared imaging systems. The uses initial scene data generate estimates gain, offset, variance additive electronic each detector element. then updates these parameters by use subsequent frames updated restore true image a least-mean-square error finite-impulse-response filter. is applied data, restored images compare...
We present new measurements of the power spectra E-mode CMB polarization, temperature T, cross-correlation E and upper limits on B-mode from 2.5 years dedicated Cosmic Background Imager (CBI) observations. Both raw maps optimal signal images in uv-plane real space show strong detections (11.7 sigma for EE spectrum overall) no detection B-mode. The are used to constrain parameters flat tilted adiabatic Lambda-CDM models: those determined TE bandpowers agree with TT, a powerful consistency...
Amorphous mesoporous silica nanoparticles ('protocells') that support surface lipid bilayers recently characterized in vitro as carrier constructs for small drug and DNA delivery are reported here highly biocompatible both vivo, involving the brain spinal cord following into lumbosacral subarachnoid space (intrathecal; i.t.). Specifically, positively charged, 1, 2-Dioleoyl-3-Trimethylammonium-Propane (DOTAP)–cholesterol (DOTAP:Chol) liposome-formulated protocells revealed stable cargo...
In this Letter we propose an adaptive scene-based nonuniformity correction method for fixed-pattern noise removal in imaging arrays. It is based on the minimization of total variation estimated irradiance, and resulting function optimized by isotropic approach making use alternating strategy. The proposed provides enhanced results when applied to a diverse set real IR imagery, accurately estimating nonunifomity parameters each detector focal-plane array at fast convergence rate, while also...
Gold nanoparticles (AuNPs) are currently under intense investigation for biomedical and biotechnology applications, thanks to their ease in preparation, stability, biocompatibility, multiple surface functionalities, size-dependent optical properties. The most commonly used method AuNP synthesis aqueous solution is the reduction of tetrachloroauric acid (HAuCl4) with trisodium citrate. We have observed variations pH concentration gold colloidal suspension synthesized standard conditions,...
What is to our knowledge a new scene-based algorithm for nonuniformity correction in infrared focal-plane array sensors has been developed. The technique based on the inverse covariance form of Kalman filter (KF), which reported previously and used estimating gain bias each detector from scene data. are assumed constant within given sequence frames, corresponding certain time operational conditions, but they allowed randomly drift one another following discrete-time Gauss-Markov process....
The non-uniform response in infrared focal plane array (IRFPA) detectors produces corrupted images with a fixed-pattern noise. In this paper we present an enhanced adaptive scene-based non-uniformity correction (NUC) technique. method simultaneously estimates detector's parameters and performs the compensation using neural network approach. addition, proposed doesn't make any assumption on kind or amount of presented raw data. strength robustness relies avoiding presence ghosting artifacts...
A novel adaptive scene-based nonuniformity correction technique is presented. The simultaneously estimates detector parameters and performs the based on retina-like neural network approach. proposed method includes use of an learning rate rule in gain offset parameter estimation process. This rule, together with a reduction averaging window size used for estimation, may provide efficient implementation that should increase original method's ability to estimate fixed-pattern noise....
We present final results on the angular power spectrum of total intensity anisotropies in CMB from CBI. Our analysis includes all primordial anisotropy data collected between January 2000 and April 2005, benefits significantly an improved maximum likelihood pipeline. It also a 30 GHz foreground survey conducted with Green Bank Telescope (GBT) which places significant constraints possible contamination due to point sources. improve previous CBI by about factor two damping tail. These confirm,...
ABSTRACT. Zinc and copper status was evaluated in nineteen children with chronic diarrhea. An intestinal biopsy suggested that eight of these patients had celiac disease eleven suffered diarrhea without malabsorption normal villi or minimal changes. They were studied for compared two control groups consisting healthy malnourished children. Plasma zinc depressed the group when children, but similar to Hair also (23.2± 15.2 34.4±21.9 μg/g those respectively, vs. 97.9± group). hair values...
A rigorous model is developed for determining single-photon quantum efficiency (SPQE) of avalanche photodiodes (SPADs) with simple or heterojunction multiplication regions. The analysis assumes nanosecond gated-mode operation the SPADs and that band-to-band tunneling carriers dominant source dark current in region. then utilized to optimize SPQE as a function applied voltage, given operating temperature multiplication-region structure material. can be In/sub 0.52/Al/sub 0.48/As InP regions...
In this paper a low-cost, practical pixel-based flame spectrum and temperature estimation system based on color images is proposed. A spectral resolution of ∼ 0.4 nm achieved with an optical formed by camera, linear model, flame's training data, reconstruction procedure. As proof concept, the estimated spectra are compared to local measurements performed commercial spectrometer. order estimate absolute flame-temperature maps, two radiometric at different wavelengths reconstructed two-color...
In this paper, we report on spectral features emitted by a reaction shaft occurring in flash smelting of copper concentrates containing sulfide minerals such as chalcopyrite (CuFeS2), bornite (Cu5FeS4) and pyrite (FeS2). Different combustion conditions are addressed, sulfur-copper ratio oxygen excess. Temperature emissivity estimated for each case using the two wavelength method radiometric models. The most relevant results have shown an increasing intensity behavior higher ratios contents,...
We present an adaptive technique for the estimation of nonuniformity parameters infrared focal-plane arrays that is robust with respect to changes and uncertainties in scene sensor characteristics. The proposed algorithm based on using a bank Kalman filters parallel. Each filter independently estimates state variables comprising gain bias matrices sensor, according its own dynamic-model parameters. supervising component then generates final by forming weighted superposition all rendered each...
In this paper, we report on the spectral detection of wustite, Fe(II) oxide (FeO), and magnetite, Fe(II, III) (Fe3O4), molecular emissions during combustion pyrite (FeS2), in a laboratory-scale furnace operating at high temperatures. These species are typically generated by reactions occurring (oxidation) iron sulfide mineral. Two schemes addressed: first consisting measurements with built-in developed spectrometer sensitivity resolution. The second one spectra measured low resolution...
In this article we present the development of a biosensor system that integrates nanotechnology, optomechanics and spectral detection algorithm for sensitive quantification antibiotic residues in raw milk cow. Firstly, nanobiosensors were designed synthesized by chemically bonding gold nanoparticles (AuNPs) with aptamer bioreceptors highly selective four widely used antibiotics field veterinary medicine, namely, Kanamycin, Ampicillin, Oxytetracycline Sulfadimethoxine. When molecules are...
Coupling HSI and μ-LIBS for elemental mineralogical imaging in rocks. Elemental mineral distribution with micrometric spatial resolution. was expanded to a new field of molecular imaging.