| Erosion Control and Environment Restoration Plan Development, Matagorda County, Texas. Phase 1: Preliminary Investigation |
Jul 2012 |
113 pages |
| Authors:
Robert Thomas; Lauren Dunkin; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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 | This report documents the investigation of coastal processes and development of conceptual alternatives to reduce beach erosion at two sites in Matagorda County. Sargent Beach has experienced the greatest erosion rates on the Texas Coast, prompting study into structural methods to protect beach habitat. Additionally, the three miles of beach to the east of the Mouth of the Colorado River is a candidate for structural stabilization. The proximity of the ... |
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| Verification and Validation of the Coastal Modeling System. Report 3: CMS-Flow: Hydrodynamics |
Dec 2011 |
148 pages |
| Authors:
Alejandro Sanchez; Weiming Wu; Tanya M Beck; Honghai Li; III Rosati James; Robert Thomas; Julie D Rosati; Zeki Demirbilek; Mitchell Brown; Christopher Reed; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| This is the third report, Report 3, in a series of four reports toward the Verification, and Validation (V&V) of the Coastal Modeling System (CMS). All details of the V&V study specific to the hydrodynamic modeling are provided in this report. The primary goal of this study task was to perform a comprehensive assessment of the predictive skills of the CMS-Flow model for a wide range of problems encountered in ... |
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| A Methodology for Reflected Laser Beam Hazard Analyses |
10 May 2010 |
24 pages |
| Authors:
Edward Early; George Megaloudis; Paul Kennedy; Robert Thomas; TASC INC SAN ANTONIO TX
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| Previous reflected laser beam hazard evaluations have been based primarily on simplifying and overly conservative assumptions. In the case of high-energy laser (HEL) field tests, such assumptions typically produce Reflected Nominal Ocular Hazard Distance (RNOHD) results that cannot be contained within the boundaries of existing test ranges. This severely limits the ability to test HEL systems under operational conditions. A methodology was developed to address the need of the laser ... |
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| Theoretical and Experimental Bioeffects Research for High-Power Terahertz Electromagnetic Energy |
Jan 2007 |
7 pages |
| Authors:
Jill McQuade; Nichole Jindra; Semih Kumru; Ron Seaman; Alex Salazar; Victor Villavicencio; Clark; C D III; Kalyn Yaws; Jason Payne; Robert Thomas; William Roach; AIR FORCE RESEARCH LAB BROOKS AFB TX HUMAN EFFECTIVENESS DIR/DIRECTED ENERGY BIOEFFECTS DIV
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| Historically, safety analyses for radio frequency emission and optical laser exposures have been designed to define the threshold level for tissue damage. To date, no experimental studies have documented damage thresholds to living tissues in the terahertz (THz) range of electromagnetic frequencies (0.1 - 10 THz). Exposure limits exist as extrapolated estimates at the extreme bounds of current occupational safety standards for lasers and radio frequency sources. Therefore, due to ... |
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| An Investigation of Bremsstrahlung Reflection in a Dense Plasma Focus Device |
MAR 2006 |
54 pages |
| Authors:
Robert Thomas; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| An overview of Bremsstrahlung radiation, which is prevalent in high-temperature fusion plasmas, is given, as well as estimates for the power and energy flux to a reflector wall from a dense plasma focus device burning p-11B. From these calculations, the wall temperature and ablation rate can be calculated. The physics derived from Inertial Confinement Fusion (ICF) Hohlraum use are applicable in the case where the wall temperature exceeds 105 K, ... |
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| An Investigation of Bremsstrahlung Reflection in a Dense Plasma Focus (DPF) Propulsion Device |
2006 |
9 pages |
| Authors:
Robert Thomas; G. H. Miley; Franklin Mead; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| The dense plasma focus device is one of the few fusion systems that is capable of burning advanced fuels such as D - 3He and p - 11B. An study has been performed and shown that three main requirements must be satisfied to reach breakeven for DPF fusion: a high Ti/Te ration (~ 20), an order of magnitude higher pinch lifetime, and the reflection and absorption if at least 50% ... |
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| Simultaneous Exposure Using 532 and 860 nm Lasers for Visible Lesion Thresholds in the Rhesus Retina |
Jan 2005 |
10 pages |
| Authors:
William Roach; Robert Thomas; Gavin Buffington; Garrett Polhamus; John Notabartolo; Cheryl DiCarlo; Kevin Stockton; David Stolarski; Kurt Schuster; Val Carothers; Benjamin Rockwell; Clarence Cain; AIR FORCE RESEARCH LAB BROOKS AFB TX OPTICAL RADIATION
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| The growth of commercially available, simultaneous muiti-wavelength laser systems has increased the likelihood of possible ocular hazard. For example, many systems utilize frequency multiplying methods to produce combinations of visible, near-infrared, and ultraviolet wavelengths. Unfortunately, very little data exists to substantiate the current methods for estimating hazards from simultaneous lasing. To properly assess the retinal hazards from these wavelengths, the retinal effects of 10-s laser irradiation from 532 and 860 ... |
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