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Jackson, D.

Publications and source records attributed to Jackson, D..

18 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Western Sector In-Situ Chemical Oxidation Project: Initial Results Following Injection Activities (U)

The persistence of elevated groundwater concentrations of volatile organic compounds (VOCs) (i.e., trichloroethylene [TCE] and tetrachloroethylene [PCE]) in the Lost Lake Aquifer Zone (LLAZ) requires focused treatment to supplement the removal of these contaminants by the existing corrective action systems. The 2000 Resource Conservation and Recovery Act Part B Permit Renewal Application: M-Area and Metallurgical Laboratory Hazardous Waste Management Facilities (HWMFs) Post Closure (WSRC-IM-98-30, Volume III, Revision 7, March 2014) included the use of four temporary authorization (TA) requests to assess the effectiveness of different corrective action technologies at the field scale in the Western and Southern Sectors of A/M Area. There is indeterminate dense non-aqueous phase liquid (DNAPL) associated with historic migration along geologic strata. The DNAPL source is likely the M-Area Settling Basin; however, the 321-M Solvent Storage Tank Area is another potential source. Both of these source areas have been treated using dynamic underground stripping and soil vapor extraction. Groundwater from both of these potential source locations is currently undergoing groundwater pump and treat.

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE W↗
NASA NTRS2018

Artificial Intelligence Integration for the ISS Antenna Management (IAM) Software

On the integration of artificial intelligence into the ISS (International Space Station) Antenna Manager software. Overview: Background/Description of the problem we are solving; Overview of ISS Antenna Manager capabilities; Overview of the US Air Force Academy's Neural Network development; Proposed integration approach; Future developments.

Artificial Intelligence↗
NASA NTRS2002

Optical communication noise rejection using corelated photons

This paper describes a completely new way to perform noise rejection using photons correlated through quantum entanglement to improve an optical communications link in the presence of uncorrelated noise. In particular, a detailed analysis is made of the case where a classical link would be saturated by an intense background, such as when a satellite is in front of the sun, and identifies where the quantum correlating system has superior performance.

signal to noise enhancement↗
NASA NTRS1999

An Intercomparison of Radiation Codes for Retrieving Upper Tropospheric Humidity in the 6.3-micron Band: A Report from the 1st GVaP Workshop

An intercomparison of radiation codes used in retrieving upper tropospheric humidity (UTH) from observations in the v2 (6.3 microns) water vapor absorption band was performed. This intercomparison is one part of a coordinated effort within the GEWEX Water Vapor Project (GVaP) to assess our ability to monitor the distribution and variations of upper tropospheric moisture from space-borne sensors. A total of 23 different codes, ranging from detailed line-by-line (LBL) models, to coarser resolution narrow-band (NB) models, to highly-parameterized single-band (SB) models participated in the study. Forward calculations were performed using a carefully selected set of temperature and moisture profiles chosen to be representative of a wide range of atmospheric conditions. The LBL model calculations exhibited the greatest consistency with each other, typically agreeing to within 0.5 K in terms of the equivalent blackbody brightness temperature (T(sub b)). The majority of NB and SB models agreed to within +/- 1 K of the LBL models, although a few older models exhibited systematic T(sub b) biases in excess of 2 K. A discussion of the discrepancies between various models, their association with differences in model physics (e.g. continuum absorption), and their implications for UTH retrieval and radiance assimilation is presented.

Soden, B.↗
NASA NTRS1994

Photonics Systems in Satellite Applications

Photonics is an emerging technology which combines electronics and optics to develop improved communication, information or signal processing systems.

basic optical and electronic concepts photonics in↗
NASA NTRS1984

In-flight Absolute Radiometric Calibration of the Thematic Mapper

The Thematic Mapper (TM) multispectral scanner system was placed into Earth orbit on July 16, 1982, as part of NASA's LANDSAT 4 payload. To determine temporal changes of the absolute radiometric calibration of the entire system in flight, spectroradiometric measurements of the ground and the atmosphere are made simultaneously with TM image acquisitions over the White Sands, New Mexico area. By entering the measured values into an atmospheric radiative transfer program, the radiance levels at the entrance pupil of the TM in four of the TM spectral bands are determined. These levels are compared to the output digital counts from the detectors that sampled the radiometrically measured ground area, thus providing an absolute radiometric calibration of the entire TM system utilizing those detectors. By reference to an adjacent, larger uniform area, the calibration is extended to all 16 detectors in each of the three bands.

Castle, K. R.↗