| First-Principles Monte-Carlo Simulation of Homogeneous Condensation in Atomic and Molecular Plumes |
Jun-2009 |
17 pages |
| Authors:
Sergey Gimelshein; Ingrid Wysong; Ryan Jansen; Michael Zeifman; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
 | First-principles kinetic theory is used in this work to analyze non-equilibrium homogeneous condensation of argon and water. The present model uses a recombination-reaction energy-dependent mechanism of the DSMC method for the dimer formation, and RRK model for the evaporation. Three-step validation of the model is conducted, (i) comparison of clusterization rates in an equilibrium heat bath with theoretical predictions, (ii) comparison of the argon dimer fractions in an orifice expansion ... |
|
| Accuracy Analysis for Kinetic Modeling of Homogeneous Condensation in Plumes |
Jun-2009 |
6 pages |
| Authors:
Sergey Gimelshein; Deborah Levin; Ingrid Wysong; Ryan Jansen; Michael Zeifman; Zheng Li; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Two different approaches for modeling the clustering in rapidly expanding plumes have been reported in the literature. The first approach, known as the classical approach, takes its starting point from the classical nucleation theory (CNT) which is based on equilibrium thermodynamics. The second one, known as the kinetic approach, treats nucleation as the process of kinetic chemical aggregation. The first, macroscopic, approach, while being useful and found to be applicable ... |
|
| Design of Energetic Ionic Liquids |
12-May-2009 |
9 pages |
| Authors:
Sharon Hammes-Schiffer; Jerry A Boatz; Mark S Gordon; Gregory A Voth; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| An essential need of the US Air Force is the discovery, development, and fielding of new, energetic materials for advanced chemical propulsion in space and missile applications. Some of the key factors driving the requirement for new chemical propellants include: (a) improved performance in terms of increased specific impulse and density, (b) reduced sensitivity to external stimuli such as impact, friction, shock, and electrostatic discharge, and (c) mitigation of environmental ... |
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| Total and Differential Sputter Yields of Boron Nitride Measured by Quartz Crystal Microbalance (Preprint) |
07-May-2009 |
19 pages |
| Authors:
B Rubin; A P Yalin; J Topper; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| We present differential sputter yield measurements of boron nitride due to bombardment by xenon ions. A four-grid ion optics system is used to achieve a collimated ion beam at low energy (100 eV). A quartz crystal microbalance (QCM) is used to measure differential sputter yield profiles of condensable components from which total sputter yields can also be determined. We report total and differential sputter yields of three grades of boron ... |
|
| Acoustic Excitation of Liquid Fuel Droplets and Coaxial Jets |
Jan-2009 |
271 pages |
| Authors:
Juan I Rodriguez; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| This experimental study focuses on two important problems relevant to acoustic coupling with condensed phase transport processes, with special relevance to liquid rocket engine and airbreathing engine combustion instabilities. The first part of this dissertation describes droplet combustion characteristics of various fuels during exposure to external acoustical perturbations. Methanol, ethanol, a liquid synthetic fuel derived from coal gasification via the Fischer-Tropsch process, and a blend of aviation fuel and the ... |
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| Deterministic Entangled Nanosource |
Aug-2008 |
10 pages |
| Authors:
Galina Khitrova; ARIZONA UNIV TUCSON
|
| During the three years of this grant, conclusions were reached that are important for the future of semiconductor cavity QED utilizing photonic crystal nanocavities. A new way was found to scan the cavity mode by condensation of xenon or nitrogen while keeping the quantum dot cold to minimize dephasing. Absorption was shown to reduce the cavity Q when the dot density is 400 per square micron. Lasing with a soft ... |
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| Impact of High Sulfur Military JP-8 Fuel on Heavy Duty Diesel Engine EGR Cooler Condensate |
14-Apr-2008 |
9 pages |
| Authors:
Michael Mosburger; Jerry Fuschetto; Dennis Assanis; Zoran Filipi; Heather McKee; AUTOMOTIVE RESEARCH CENTER ANN ARBOR MI
|
| Low-sulfur "clean" diesel fuel has been mandated in the US and Europe. However, quality of diesel fuel, particularly the sulfur content, varies significantly in other parts of the world. Due to logistical issues in various theaters of operation, the Army is often forced to rely on local fuel supplies, which exposes vehicles to diesel fuel or jet fuel (JP-8) with elevated levels of sulfur. Modern engines typically use cooled Exhaust ... |
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| A Chemoprevention Trial to Study the Effects of High Tea Consumption on Smoking-Related Oxidative Stress |
FEB 2008 |
10 pages |
| Authors:
Iman A. Hakim; ARIZONA UNIV TUCSON
|
| Our overall goal is to develop a safe and feasible model for the chemoprevention of a wide range of tobacco-related diseases. Our immediate goal that is addressed over a 5-year study period is to determine the effects of high tea consumption on biological markers of oxidative stress that mediate lung cancer risk. We are conducting a 6-month randomized controlled double-blinded chemopreventive trial in a group of COPD subjects who are ... |
|
| Effect of Environmental Parameters on the Biocidal Performance of Iodine-Treated Filters |
JAN 2008 |
85 pages |
| Authors:
Chang-Yu Wu; Jin-Hwa Lee; Lindsey Reiemenschneider; Alexandros D. Theodore; FLORIDA UNIV GAINESVILLE DEPT OF ENVIRONMENTAL ENGINEERING SCIENCES
|
| Iodine-treated filter media were challenged at a face velocity of 14.2 cm/s by Bacillus subtilis spores and MS2 bacteriophage aerosols generated from a Collison nebulizer. The novel medium displayed excellent viable removal efficiency (VRE) for bacterial spores with a negligible pressure drop in various environmental conditions, suggesting an alternative to HEPA filters for the removal of bacterial spore aerosols. Different filter media tested for viral aerosols showed VRE >90% but ... |
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| Mold Susceptibility of Rapidly Renewable Building Materials Used in Wall Construction |
DEC 2007 |
81 pages |
| Authors:
Aaron M. Cooper; TEXAS A AND M UNIV COLLEGE STATION
|
| Since 1998, the United States Green Building Council, via the Leadership in Energy and Environmental Design (LEED) standards, has established the premiere set of guidelines for construction ethics from the standpoint of eco-friendliness and occupant safety and health in the U.S. and around the world. These guidelines are skyrocketing in use due in part to two reasons: increased awareness of a need for reducing, reusing, and recycling in order to ... |
|
| Cold Regions: Instrumentation Operation and Use. Test Operations Procedure (TOP) 1-1-004 |
10 OCT 2007 |
13 pages |
| Authors:
ARMY COLD REGIONS TEST CENTER FORT GREELY AK
|
| This Test Operating Procedure (TOP) provides background information on the problems and adaptations associated with instrumentation, photographic, and video equipment required for conducting tests in cold regions. Basic information and procedures are presented as general guidelines to planning and using instrumentation systems for cold environments. Further information regarding cold temperature effects is contained in Army Material Command Pamphlet (AMCP) 706-116, Engineering Design Handbook, Environmental Series, Part Two, Natural Environmental Factors, ... |
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| Raman Scattering Study of Supercritical Bi-Component Mixtures Injected into a Subcritical Environment |
SEP 2007 |
154 pages |
| Authors:
Young M. An; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research studies the species distribution profiles of methane/ethylene bi-components at downstream locations filled with subcritical nitrogen in a closed chamber. Unique thermodynamic and transport properties of supercritical fluids along with phase transition phenomena during fuel injection process can significantly change combustion characteristics inside a scramjet combustor. Plume properties of supercritical jets are of great interests to the studies of fuel/air mixing and subsequent combustion. The primary goal of this ... |
|
| MDA Ice Detection and Measurement Camera Development and Validation for NASA-KSC (2004-2007) |
17 AUG 2007 |
102 pages |
| Authors:
Thomas Meitzler; Darryl Bryk; Euijung Sohn; Mary Bienkowski; Kimberly Lane; Michele Charbeneau; Gregory Smith; James Ragusa; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND WARREN MI
|
| The formation of frost, ice, and ice balls are common occurrences on the insulated External Tank (ET) of the Space Transportation System (STS) during National Aeronautics and Space Administration (NASA)-Kennedy Space Center (KSC), Florida launch preparations. The metal ET tank, 154 ft. tall and 27.5 ft. in diameter, is covered by insulating Sprayed On Foam Insulation (SOFI). However, internal ET fuel and oxidizer tanks contain large quantities of cryogens-in this ... |
|
| Characterization of Particle Output From a Percussion Primer |
AUG 2007 |
24 pages |
| Authors:
Lang-Mann Chang; Anthony W. Williams; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Measurements were made for the percentage of combustion products in condensed phases from a no. 41 percussion primer, and the influence of the condensed phases on the charge ignition in the 5.56-mm ammunition was characterized. The studies were carried out in three phases using three different test fixtures. Results showed 34% of the combustion products in condensed phases, including liquid and solid particles. With the residue remaining in the primer ... |
|
| Freezing Fog Formation in a Supercooled Boundary Layer: Solving the Winter Fog Forecasting Challenge for Elmendorf Air Force Base, Alaska |
MAR 2007 |
105 pages |
| Authors:
Bradley J. Harbaugh; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| We have examined four complex freezing fog events at Elmendorf Air Force Base, Alaska, to determine the root cause of the fog. These events have drastically impacted operations in the region for years, and are still a mystery to forecasters. The primary goal was to provide a detailed analysis of conditions within the boundary layer that contributed to freezing fog formation within the supercooled liquid water boundary layer. The data ... |
|
| Severe Weather Forecasting for Laughlin AFB, TX |
MAR 2007 |
99 pages |
| Authors:
Eric J. Cercone; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A sounding climatology of a variety of parameters commonly used to forecast deep, moist convection using upper-air observations is developed. The data set includes 0000 and 1200 UTC rawinsonde data (approximately 3629 soundings) from Laughlin AFB, TX from April September 1995 2004. Cloud-to-ground lightning data, surface observations, and severe weather reports from the Storm Prediction Center (SPC) SeverePlot2 Program were used to categorize soundings as representative of conditions for no ... |
|
| The Electronic Structure and Field Effects of an Organic-Based Room Temperature Magnetic Semiconductor |
01-Jan-2007 |
148 pages |
| Authors:
Derek M Lincoln; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The future of spin-electronics or "spintronics" lies in the development of viable magnetic semiconductors that can effectively operate at room temperature Vanadium tetracyanoethylene (V[TCNE]~2) is a magnetic semiconductor with an ordering temperature well above that of room. Its highly disordered structure has hampered a comprehensive description of the interactions between the V and TCNE sublattices that give rise to its magnetic and electrical properties. We report the results of high-resolution ... |
|
| Building Qualitative Models of Thermodynamic Processes |
2007 |
77 pages |
| Authors:
John W. Collins; Kenneth D. Forbus; ILLINOIS UNIV AT URBANA BECKMAN INST
|
| This paper describes a qualitative domain theory for core phenomena in engineering thermodynamics, expressed in Qualitative Process theory. It represents many of the best features of domain models developed by our group over the past five years. It focuses on supporting system-level qualitative analyses of typical fluid and thermal systems, such as refrigerators and power plants. We use explicit modeling assumptions [3] to control the level of detail used in ... |
|
| Validation and Support of a Quantitative Infrared Instrument Facility and Generation of a Library of Chemical Warfare and Related Materials by Fourier Transform Infrared Spectroscopy |
NOV 2006 |
98 pages |
| Authors:
Barry R. Williams; Melissa S. Hulet; Avishai Ben-David; Ronald W. Miles; Alan C. Samuels; Chiang-Jiang Zhu; Norman Green; EAI CORP ABINGDON MD
|
| This report summarizes the effort to generate a library of quantitative infrared spectra of chemical warfare agents and related materials and biosimulants. The results of tests to validate the equipment and procedures to be used in the laboratory are discussed. |
|
| Study of Self-Assembly Monolayers for Colloidal Processing of Ceramics and Textured, Super-Hydrophobic |
18 AUG 2006 |
9 pages |
| Authors:
Frederick F. Lange; CALIFORNIA UNIV REGENTS SANTA BARBARA OFFICE OF RESEARCH
|
| Objectives are proposed concerning the molecules that form self assembled monolayers (SAMs) that can be used in colloidal powder processing and the fabrication of textured, super-hydrophobic ceramic surfaces. The first objective is to understand and control the steric forces between particles coated with hydrophilic (water loving) SAMs. This approach is new and will be exploited by industry in a variety of applications. The second is to use this knowledge to ... |
|
| Water from Air |
23 MAY 2006 |
6 pages |
| Authors:
Jay Dusenbury; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| PURPOSE: Develop capability to produce drinking water by harvesting water from humidity sources, including atmosphere and vehicle crew compartment; PRODUCT: Lightweight, energy efficient device to generate and treat water from air for small units or platform integration; PAYOFF: Reduce the logistical footprint associated with water storage and distribution; enable soldiers/sytems/units to operate without re-supply for 72 hours. |
|
| Particle Image Velocimetry Using a Novel, Non-Intrusive Particle Seeding |
MAY 2006 |
96 pages |
| Authors:
II DeLapp Charles J.; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| The purpose of this research effort was to study the use of non-intrusive particle seeding for Particle Image Velocimetry (PIV). Current seeding material and techniques involve the use of either solid particles or liquid mixtures which can contaminate or damage closed circuit wind tunnels, and in some cases can introduce a potential fire or explosive hazard. The proposed method is based on creating seed particles utilizing Carbon Dioxide (CO2). The ... |
|
| Determination of MS2 Bacteriophage Stability at High pH Using the Integrated Virus Detection System (IVDS) |
APR 2006 |
16 pages |
| Authors:
Charles H. Wick; Ilya Elashvili; Patrick E. McCubbin; Amnon Birenzvige; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| A sample of MS2 stock solution was prepared by filtering with reverse osmosis water in a cross flow ultra filtration system. The cross flow ultra filtration system, which uses a molecular weight cut-off (MWCO) filter of l00K Daltons, circulates the MS2 stock solution with the water. The filter allows any impurities (e.g. growth media, miscellaneous salts, and proteins) to pass through the filter but retain the MS2. The sample of ... |
|
| Rigorous Mathematical Modeling of an Adsorption System With Electrothermal Regeneration of the Used Adsorbent |
19 JAN 2006 |
45 pages |
| Authors:
Menka Petkovska; Danijela Antov-Bozalo; Nikola Nikacevic; BELGRADE UNIV (YUGOSLAVIA)
|
| The general objective of the project is fundamental mathematical modeling of a complex TSA system with electrothermal desorption step, with absorbers assembled of one or more cartridge-type, radial flow fixed beds and with in-vessel condensation of the desorbed vapor. During the first stage of the project, a 1-D mathematical model of a single cartridge without condensation was developed in Matlab and used for simulation. During the second stage of the ... |
|
| CVN-21 Carrier Turbine Blade Tree Section |
23 SEP 2005 |
2 pages |
| Authors:
NATIONAL CENTER FOR DEFENSE MANUFACTURING AND MACHINING LATROBE PA
|
| Dresser-Rand Corporation located in Wellsville, New York, is responsible for power generation for the new CVN-21 Carrier for the U.S. Navy. Development of newer power generation systems has lead to the use of advanced materials with characteristics that allow the turbine blade (bucket) to withstand increased condensation levels. The new material characteristics, with higher than normal Rockwell hardness, created many manufacturing challenges. Shorter tool life, longer processing times, and longer ... |
|
| Experimental Investigation of the Interaction of Electrothermal Plasmas with Solid Propellants |
31 JUL 2005 |
37 pages |
| Authors:
Michael D. Ryan; Noel T. Clemens; Philip L. Varghese; TEXAS UNIV AT AUSTIN OFFICE OF SPONSORED PROJECTS
|
| The work presented is part of continuing experimental study of the ignition of solid propellants by electrothermal capillary plasmas. Experiments have been made to characterize further the pulsed plasma expanding into room air and to investigate ignition of JA-2 propellant in a closed chamber. A particular emphasis is placed on discussing the difficulties in conducting diagnostics in this challenging environment. Heat flux measurements were made with a heat flux sensor ... |
|
| Rigorous Mathematical Modeling of an Adsorption System With Electrothermal Regeneration of the Used Adsorbent |
28 JUL 2005 |
59 pages |
| Authors:
Menka Petkovska; Danijela Antov-Bozalo; Ana Markovic; BELGRADE UNIV (YUGOSLAVIA)
|
| The general objective of the project is fundamental mathematical modeling of a complex TSA system with electrothermal desorption step, with adsorbers assembled of one or more activated carbon fiber clot (ACFC) cartridge-type, radial flow fixed beds and with in-vessel condensation of the desorbed vapor. During the first stage of the project, a mathematical model of a single cartridge without condensation was developed and used for simulation. the objective of this, ... |
|
| Applicability of the Homogeneous Nucleation Theory to the Condensation in Free Gas Expansions |
13 JUL 2005 |
9 pages |
| Authors:
M. I. Zeifman; J. Zhong; D. A. Levin; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF AERONAUTICAL ENGINEERING
|
| The traditional application of the classical homogeneous nucleation theory (CNT) to the condensation in rapidly expanding flows involves the use of the steady-state nucleation rate. Since this rate is derived under the assumption of both steady-state and isobaric/isothermal conditions, the applicability of CNT to highly nonequilibrium environments may be questionable. In addition, the usual strategy of CNT gas dynamics coupling violates the original nucleation theory even in the isothermal/isobaric environment. ... |
|
| Diffusiophoresis of a Spherical Volatile Particle |
13 JUL 2005 |
7 pages |
| Authors:
Kazuo Aoki; Masatake Hatano; Shingo Kosuge; Shigeru Takata; KYOTO UNIV (JAPAN) DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| A spherical condensed phase (volatile particle) is placed in an infinite expanse of a binary mixture consisting of the vapor of the condensed phase and another noncondensable gas. The mixture is assumed to be at rest with uniform pressure and temperature at infinity. However, the vapor and the noncondensable gas have small uniform density (or concentration) gradients of the same magnitude but in the opposite direction. The flows of both ... |
|
| A Kinetic Model for Vapor-liquid Flows |
13 JUL 2005 |
7 pages |
| Authors:
Aldo Frezzotti; Livio Gibelli; Silvia Lorenzani; POLITECNICO DI MILANO (ITALY) IST DI MATEMATICA
|
| The evaporation of a liquid slab into vacuum is studied by numerical solutions of the Enskog-Vlasov equation for a fluid of spherical molecules interacting by Sutherland potential. The main aim of this work is to obtain the structure of the vapor-liquid interface in non-equilibrium conditions as well as the distribution function of evaporating molecules. The results show that the distribution function of molecules crossing a properly defined vapor-liquid boundary is ... |
|
| System for Bulk Growth of Gallium Nitride. Vapor Phase Epitaxy of Gallium Nitride by Gallium Arc Evaporation |
09 MAR 2005 |
17 pages |
| Authors:
Sten J. Heikman; Umesh K. Mishra; CALIFORNIA UNIV SANTA BARBARA
|
| A vapor phase growth system intended for the growth of bulk gallium nitride crystals was investigated. Potential advantages of the growth technique are cheap source materials of high purity, no corrosive gasses, and low operating and equipment costs. Ga contained in a crucible was evaporated by an arc discharge between a W-electrode and the Ga surface, and was transported to the growth zone by a carrier gas flowing over the ... |
|
| Novel Role of Candidate Tumor Suppressor ANX7 Gene in Prostate Cancer |
MAR 2005 |
18 pages |
| Authors:
Meera Srivastava; HENRY M JACKSON FOUNDATION FOR THE ADVANCEMENT OF MILITARY MEDICINE ROCKVILLE MD
|
| The purpose of this study is to determine the mechanism and the signaling pathway by which the ANX7 gene induces death of prostate cancer cells. The ANX7 induced apoptotic pathway involves calcium and cytochrome c release and morphological changes, nuclear fragmentation and chromatin condensation. Overexpression of ANX7 reduces the percentage of cells that are capable of responding to the IP3-generating agonist acetylcholine with a reduction in the magnitude of the ... |
|
| Role of Intracloud Lightning in Tornadogenesis |
MAR 2005 |
16 pages |
| Authors:
Ronald W. Armstrong; ARMSTRONG CONSULTING OCEAN CITY MD
|
| The role of cloud electrification within supercells and, in particular, the role of lightning in tornadogenesis is re-examined. Rather than cloud-to-ground lightning, it is intracloud lightning that is the culprit for enhancing updraft wind velocities to tornadic levels. The lightning produces within the intracloud chamber both: (1) newly generated hydrogen ions, of negligible cross-section, that stream downwards to recombine with the main resident lower cloud hydroxyl ion concentration, thereby liberating ... |
|
| CVN-21 Carrier Power Generation/Turbine Blade |
17 FEB 2005 |
2 pages |
| Authors:
NATIONAL CENTER FOR DEFENSE MANUFACTURING AND MACHINING LATROBE PA
|
| Dresser-Rand Corporation located in Wellsville, New York, is responsible for power generation for the new CVN-21 Carrier for the U.S. Navy. Development of newer power generation systems has lead to the use of advanced materials with characteristics that allow the turbine blade (bucket) to withstand increased condensation levels. The new material characteristics, with higher than normal Rockwell hardness, created many manufacturing challenges. Shorter tool life, longer processing times, and longer ... |
|
| A Chemoprevention Trial to Study the Effects of High Tea Consumption on Smoking-Related Oxidative Stress |
FEB 2005 |
14 pages |
| Authors:
Iman A. Hakim; ARIZONA UNIV TUCSON
|
| Our overall goal is to develop a safe and feasible model for the chemoprevention of a wide range of tobacco-related - diseases. Our immediate goal, that is addressed over a 4-year study period, is to determine the effects of high tea - consumption on biological markers of oxidative stress that mediate lung cancer risk. We are conducting a 6-month randomized, controlled, double-blinded chemopreventive trial in a group of COPD subjects ... |
|
| APTU Nozzle Code Manual, Version 3.0 |
JAN 2005 |
32 pages |
| Authors:
Graham V. Candler; MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND MECHANICS
|
| A nozzle simulation code developed for AEDC is designed for the analysis of hypersonic converging-diverging nozzles including the effects of high pressure, finite-rate chemical reactions and vibrational relaxation, and turbulent wall boundary layers. In addition, a module has been written to predict the onset of water vapor condensation for hydrocarbon combustion product test gases. The flow solver is based on the data-parallel line relaxation (DPLR) numerical technique. The software package ... |
|
| Tools for Condensed Phase Computational Chemistry |
01 OCT 2004 |
20 pages |
| Authors:
Krzysztof Szalewicz; DELAWARE UNIV NEWARK DEPT OF PHYSICS
|
| The workshop developed recommendations for those computational chemistry tools best suited to attack research problems in properties of energetic molecules - individually and in condensed phases. A small, international group of experts presented their work and discussed current tools of computational chemistry in the context of the Army program of energetic material design. These experts, chosen for their specific skills, came from Europe and the US. |
|
| Advancement and Application of Multiphase CFD Modeling to High Speed Supercavitating Flows |
20 AUG 2004 |
34 pages |
| Authors:
Jules W. Lindau; Robert F. Kunz; PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB
|
| Recent progress in the development and application of homogenous multiphase CFD methods for large-scale gas cavities in liquid flows are presented. The focus of the presentation is on work in n-species transport approaches applied to developed and super-cavitation. Numerical formulation, physical modeling, and applications are included. Numerical issues to be discussed include: preconditioning in the context of incompressible through supersonic Mach numbers, arbitrary numbers of species, high density ratios, and ... |
|
| Cooling and Trapping of Atoms and Particles |
AUG 2004 |
11 pages |
| Authors:
Steven Chu; STANFORD UNIV CA BOARD OF TRUSTEES
|
| In this work, we report a summary of the more than 60 magnetic field- induced Feshbach resonances in ultracold collisions of ground-state cesium atoms. The detection is based on elastic, inelastic and radiative collision processes. The observations have allowed us to improve upon the interaction potentials between cesium atoms, which, in turn, allowed us to predict the possible magnetic field regions where the Bose condensation of cesium atoms would be ... |
|
| The Seeds of Tornado Prevention |
JUL 2004 |
21 pages |
| Authors:
J. G. Glenn; Ronald W. Armstrong; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE
|
| The role of electrification in producing tornadoes is assessed in order to present a new inventive "bottom-up" method of fly-ash-like lighter- than-air particle cloud seeding for tornado prevention. |
|
| L' AND M' Photometry Of Ultracool Dwarfs |
JUN 2004 |
23 pages |
| Authors:
M. S. Marley; Z. I. Tsvetanov; F. J. Vrba; A. A. Henden; C. B. Luginbuhl; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
|
| We have compiled L' (3.4-4.1 microns) and M' (4.6-4.8 microns) photometry of 63 single and binary M, L, and T dwarfs obtained at the United Kingdom Infrared Telescope using the Mauna Kea Observatory filter set. This compilation includes new L' measurements of eight L dwarfs and 13 T dwarfs and new M' measurements of seven L dwarfs, five T dwarfs, and the M1 dwarf Gl 229A. These new data increase ... |
|
| Simulation of Inviscid Compressible Multi-Phase Flow with Condensation |
24 MAR 2004 |
19 pages |
| Authors:
Philip Kelleners; TWENTE UNIV ENSCHEDE (NETHERLANDS)
|
| Condensation of vapors in rapid expansions of compressible gases is investigated. In the case of high temperature gradients the condensation will start at conditions well away from thermodynamic equilibrium of the fluid. In those cases homogeneous condensation is dominant over heterogeneous condensation. The present work is concerned with development of a simulation tool for computation of high speed compressible flows with homogeneous condensation. The resulting flow solver should preferably be ... |
|
| A Chemopreventive Trial to Study the Effects of High Tea Consumption on Smoking-Related Oxidative Stress |
FEB 2004 |
9 pages |
| Authors:
Iman A. Hakim; ARIZONA UNIV TUCSON
|
| Our overall goal is to develop a sage and feasible model for the chemopreventive of a wide range of tobacco-related diseases. Our immediate goal, that is addressed over a 4-year study period, is to determine the effects of high tea consumption on biological markers of -oxidative stress that mediate lung cancer risk. We are conducting a 6-month randomized, controlled, double- blinded chemopreventive trial in a group of COPD subjects who ... |
|
| A Summary of Aluminum Combustion |
JAN 2004 |
|
| Authors:
M. W. Beckstead; BRIGHAM YOUNG UNIV PROVO UT
|
 | This paper summarizes the characteristics of aluminum combustion, focusing on the burning time of individual particles. The fundamental concepts that control aluminum combustion are discussed, starting with the D(exp n) law. Combustion data from over 10 different sources with almost 400 datum points were cataloged and correlated. Available models also were used to evaluate combustion trends with key environmental parameters. The exponent is shown to be less than two, with ... |
|
| Vapor Barriers in Residential Construction: When Where and if to Utilize Them |
05 DEC 2003 |
232 pages |
| Authors:
Deron L. Frailie; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| The major problem cited by independent residential builders in new housing constmction is moisture related, primarily, rot, decay, and the growth of molds and fungus. First recognized and investigated in a 1923 Forest Products Laboratory survey of dwellings, condensation and moisture related problems were witnessed in early exterior structure paint failure (U.S. Forest Service, 1949). Current building codes and property standards contribute to the problem since the methods employed are ... |
|
| Assessment of Filament-Wound Glass-Reinforced Plastic (GRP) Pipe Technology for RAN Surface Ship Application |
SEP 2003 |
|
| Authors:
M. Z. Shah Khan; M. Jordaan; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) PLATFORM SCIENCES LAB
|
| The Royal Australian Navy (RAN) is continuously searching for solutions to reduce ship maintenance and decrease through-life costs. One serious maintenance issue on board the RAN surface fleet is keeping piping systems healthy. Piping systems are predominantly metallic and are used in transporting corrosive fluids such as seawater and oily waste water. Metallic piping is subjected to corrosion attack from flowing seawater and other corrosive fluids, and to blockage from ... |
|
| Isolation of Boron and Carbon Atoms in Cryogenic Solids |
21 AUG 2003 |
15 pages |
| Authors:
C. W. Larson; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Outline: Theoretical Isp of cryogenic solid propellants composed of the atoms, dimers and trimers of lightweight elements isolated in solid para hydrogen. Consequences of condensation; Spectroscopic studies of Boron/Carbon clusters by matrix isolation spectroscopy; Development of stable, hi-flux boron atom source for preparation of cryogenic solid HEDM (under auspices of Small Business Innovative Research (SBIR) program; First optical spectrum of B3 (under auspices of International Research Initiative of the Air ... |
|
| Isolation of Boron and Carbon Atoms in Cryogenic Solids |
13 AUG 2003 |
9 pages |
| Authors:
C. W. Larson; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Boron and carbon atoms, and their dimmers and trimers were isolated in solid argon by co-condensation of their vapors onto a substrate maintained at 10 K. Growth and disappearance of various clusters with 3 to 12 atoms that occurred during annealing was studied by quantitative Fourier Transform Infrared Spectroscopy. The annealing experiments indicated that the initially formed solids contained about 80% B and C atoms and BC molecules. At 5 ... |
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| Optical Collective Phenomena with Participation of Metastable Atoms in Decaying Plasma of Pulsed Discharge |
20 JUL 2003 |
2 pages |
| Authors:
S. N. Bagayev; V. V. Vasilyev; V. S. Egorov; V. N. Lebedev; I. B. Mekov; SAINT PETERSBURG STATE UNIV (RUSSIA)
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| Considering new methods of nonstationary plasma diagnostics, we investigate an appearance of a new type of laser spectrum generation, which is a direct consequence of underlying principles of light-matter interaction. The spectrum "condensation" and amplification observed originate from the collective coherent interaction between atoms of a dense resonant medium trough the electromagnetic field. |
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| A Reanalysis of Polyhedral Oligomeric Silsesquioxane Ions and Salts |
05 MAR 2003 |
29 pages |
| Authors:
Brent D. Viers; Tim Haddad; Michael T. Bowers; Rusty Blanski; Rene Gonzalez; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Polyhedral Oligomeric Silsesquioxanes (POSS) are of interest because the hydrolysis and condensation of the silane precursors can be controlled to form incompletely condensed "scaffolds" which can then be functionalized (via condensation) with differing moieties. However, conventional wisdom held that isolation of ionized scaffolds was impossible due to the increased reactivity of the ionic siloxy fragments. However, recent results have shown that certain POSS based salts are indeed stable. This talk ... |
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