| 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 ... |
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| Experimental/Computational Approach to Accommodation Coefficients and its Application to Noble Gases on Aluminum Surface (Preprint) |
03-Feb-2009 |
26 pages |
| Authors:
Andrew Ketsdever; Sergey F Gimelshein; Nathaniel Selden; Natalie E Gimelshein; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| A technique is proposed to assess gas-surface accommodation coefficients. The technique utilizes the fact that radiometric forces exerted on heated objects immersed in rarefied gases are governed by the interaction of gas molecules with the surface. In the present implementation, it connects measurements of radiometric forces on a heated vane in the transitional flow regime with the kinetic modeling of the flow, and derives the accommodation coefficients through the successive ... |
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| System-Wide Water Resources Program Nutrient Sub-Model (SWWRP-NSM) Version 1.1 |
01-Sep-2008 |
55 pages |
| Authors:
Zhonglong Zhang; Billy E Johnson; Terry K Gerald; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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| This report discusses major developments that have occurred since the release of NSM Version 1.0. These improvements were in the areas of: 1) partitioning of nutrients (dissolved and adsorbed) within surface runoff, 2) mass transfer of nutrients between the soils and overlying water column, 3) erosion and sedimentation of particulate nutrients, and 4) soil plant dynamics. Nutrients at or near the soil surface can be transformed to overland flow in ... |
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| Coarsening Kinetics of gamma-prime Precipitates in the Commercial Nickel Base Superalloy Rene88DT (PREPRINT) |
Sep-2008 |
28 pages |
| Authors:
J Tiley; G B Viswanathan; R Srinivasan; R Banerjee; D M Dimiduk; H L Fraser; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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| Rene88DT samples were subjected to different cooling rates after a supersolvus treatment, and aged for varying periods of time from 25 to 200 hours at 760 degrees C. Secondary and tertiary gamma-prime precipitate sizes were measured after each heat treatment condition through scanning electron microscopy (SEM) and energy filtered transmission electron microscopy (EFTEM). Coarsening rate constants were calculated and reported from the measured values of precipitate sizes. When describing the ... |
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| Destruction Chemistry of Mustard Simulants |
04-Jul-2008 |
37 pages |
| Authors:
J W Bozzelli; F C Gouldin; E M Fisher; CORNELL UNIV ITHACA NY OFFICE OF SPONSORED PROGRAMS
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| This study investigates the destruction chemistry of organosulfur compounds under both pyrolytic and oxidative conditions. We focus on the destruction of alkyl sulfides that are surrogates for chemical warfare agents H, HD, and HT. We report our work on developing thermochemistry, reaction pathways and kinetic parameters for multiple chemical subsystems, using computational chemistry methods. We also report our experimental results from flow reactor experiments for pyrolysis and oxidation of two ... |
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| Improved Kinetic Models for High-Speed Combustion Simulation |
01-Jun-2008 |
161 pages |
| Authors:
C J Montgomery; Q Tang; A F Sarofim; M J Bockelie; J K Gritton; J W Bozzelli; F C Gouldin; E M Fisher; S Chakravarthy; REACTION ENGINEERING INTERNATIONAL SALT LAKE CITY UT
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| Report developed under an STTR contract. The overall goal of this STTR project has been to improve the realism of chemical kinetics in computational fluid dynamics modeling of hydrocarbon-fueled scramjet combustors. A new, pressure-dependent detailed chemical kinetic model for a JP-8 surrogate has been created. Extinction strain rate measurements have been performed with an opposed-jet burner at subatmospheric conditions for a variety of fuels, namely: methane, ethylene, n-heptane, Jet A, ... |
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| Kinetics Based Reaction Modeling for Heterogeneous Explosives |
01 JUN 2007 |
70 pages |
| Authors:
J. K. Clutter; TEXAS UNIV AT SAN ANTONIO COLL OF ENGINEERING
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| The mechanical and chemical processes that occur in the explosives found in munitions systems are important to the entire life cycle of the system. Examples of these processes are found in the accidental detonation of weapons while in storage or transport, the premature initiation of a warhead during employment, and the destructive output from the system when functioned as designed. The complete range of possible processes encompasses a wide variety ... |
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| Electromigration Related Effects At Metal-Metal Interfaces: Application To Railguns |
MAR 2007 |
75 pages |
| Authors:
Jr Cleveland William B.; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis had 2 objectives. The first purpose of this thesis was to develop an experimental procedure to study electric current induced flow of liquid metal, similar to that found at the armature-rail contact due to local melting, to determine the kinetics of liquid flow Ga under electric current conditions. For this, a model system comprising a bead of Ga on a Cu thin film track was devised in order ... |
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| Derivation of a Theory to Estimate the Kinetic Parameters for Systems with Multiple Substrates Competing for the Same Active Site on an Enzyme |
Dec-2006 |
20 pages |
| Authors:
J R Smith; Richard E Sweeney; David T Yeung; Douglas M Cerasoli; Donald M Maxwell; David E Lenz; ARMY MEDICAL RESEARCH INST OF CHEMICAL DEFENSE ABERDEEN PROVING GROUND MD
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| In studies to characterize the kinetic parameters for catalytic hydrolysis of the organophosphorus nerve agent 1,2,2-trimethylpropyl methylphosphonofluoridate (GD) by human paraoxonase (HuPON1), it was found that standard analysis techniques could not be employed because the kinetic parameters for the GD isomers were not significantly different from each other. Separation of the racemic mixture into component stereoisomers for individual study is feasible but extremely expensive. It was recognized that a theory ... |
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| Titanium Dioxide Photo-Catalyzed Degradation Of Polyurethanes |
10 OCT 2006 |
17 pages |
| Authors:
David A. Worsley; WALES UNIV SWANSEA (UNITED KINGDOM)
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| This report results from a contract tasking University of Wales Swansea as follows: This project aims to harness new techniques developed to assess the mechanisms and kinetics of paint failure in short term exposure to the results from traditional weathering experiments. This will enable a rapid test system to be developed for polyurethane coatings which currently are showing premature failures. |
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| Quasi-Static Modelling of the Ionosphere-Magnetosphere Coupling: Ionospheric Localized Effects |
SEP 2006 |
9 pages |
| Authors:
M. Echim; M. Roth; J. De Keyser; ROMANIAN ACADEMY OF SCIENCES INSTITUTE FOR SPACE SCIENCES
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| The physical processes that take place in the auroral ionosphere (activation of auroral arcs at various spatial scales, plasma irregularities, non-homogeneities of the electric conductivity) are linked with the dynamics of the distant magnetosphere; the same geomagnetic field lines connect the polar ionosphere and the distant magnetosphere. Inside the magnetosphere the plasma parameters (temperature, density, bulk velocity) are non-uniform. We develop a stationary model that predicts the amplitude of the ... |
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| Sample Fabrication and Experimental Approach for Studying Interfacial Sliding in Thin Film-Substrate Systems |
SEP 2006 |
69 pages |
| Authors:
Michael A. Burkhard; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The purpose of this thesis was to develop an experimental methodology to determine the mechanisms and kinetics of sliding at the interface between a metallic thin film and substrate. A methodology was developed and used to study interfacial sliding of aluminum films on silicon substrates and copper films on fused quartz substrates. The methodology employed a lap shear type of geometry to load the interface between the film and substrate ... |
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| Computational Prediction of Kinetic Rate Constants |
09 JUN 2006 |
28 pages |
| Authors:
Rodney J. Bartlett; John Barker; James M. Ponton; Neil Ostlund; Ajith Perera; ACES QC LC GAINESVILLE FL
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| This is the Final Technical Report / Final Phase I Summary Report for the STTR on topic #AF05-T010 entitled Computational Prediction of Kinetic Rate Constants. In Phase I it has been shown that the combination of electronic structure offered by the ACES program system and the user-friendly interface of HyperChem can be combined together to provide the data required from quantum chemistry to provide thermal rate constants for molecules. The ... |
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| A Thermodynamically Complete Model for One-Dimensional Two-Phase Flows With Heat Exchange |
MAY 2006 |
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| Authors:
A. D. Resnyansky; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA)
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 | This publication reports on a compact presentation of a one-dimensional model for the description of two-phase flows with heat exchange. This model was proposed earlier in the form of a system of equations, containing the heat conduction and entropy conservation equations for each phase. In this report the system is formulated in a form that is consistent with the formulation of the preceding report of the author. The present system ... |
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| Extraction Kinetics of Energetic Compounds from Training Range and Army Ammunition Plant Soils |
MAR 2006 |
46 pages |
| Authors:
Marianne E. Walsh; Dennis J. Lambert; ENGINEERING RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
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| Field-contaminated soils from army ammunition plants, training ranges, and an explosive ordnance disposal area were used to determine the effect of machine grinding and extraction procedure on concentration estimates of energetics. Machine grinding for one minute did not degrade the major analytes of interest (HMX, RDX, TNT, or 2,4-DNT), but did significantly reduce the subsampling error. The platform shaker extraction procedure was found to be at least as efficient as ... |
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| Electric Discharge and Afterglow Kinetics for Laser Mixtures with Carbon Monoxide, Oxygen and Iodine |
JAN 2006 |
251 pages |
| Authors:
Andrey Ionin; RUSSIAN ACADEMY OF SCIENCES MOSCOW (RUSSIA) LEBEDEV INST
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| This report results from a contract tasking Lebedev Physics Institute as follows: Previous research carried out under the ISTC partner contracts has demonstrated that an electric discharge could be a powerful means for producing highly excited CO molecules needed for overtone CO lasers, for producing electrically excited oxygen and for obtaining iodine atoms via iodine dissociation, which can be extremely useful for the development of the electrically assisted oxygen-iodine laser. ... |
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| 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
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| 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 ... |
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| Kinetics of Thermal Decomposition of Aluminum Hydride in Argon |
MAY 2005 |
11 pages |
| Authors:
Ismail M. Ismail; Tom W. Hawkins; ENGINEERING RESEARCH AND CONSULTING INC(ERC INC) EDWARDS AFB CA
|
| Thermogravimetric analysis was utilized to investigate the decomposition kinetics of alane (AlH3) in argon atmosphere and to shed light on the mechanism of alane decomposition. Two kinetic models have been successfully developed and used to propose a mechanism for the complete decomposition of alane and to predict its shelf-life during storage. Under non-isothermal heating, alane decomposes in two steps; the slowest is solely controlled by solid state nucleation of aluminum ... |
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| Ion-Molecule Kinetics at 15-700 Torr |
2005 |
8 pages |
| Authors:
A. A. Viggiano; Abel I. Fernandez; J. Troe; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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| Studies of ion-molecule chemistry are usually made at pressures of a few Torr and below. By contrast, there are numerous plasmas that occur at higher pressures. For that reason, we have constructed a turbulent ion flow tube (TIFT) for studying ion-molecule kinetics from 15 to 700 Torr. Currently, the TIFT operates from room temperature to 700 K. Here we present a summary of the measurements we have made to date. ... |
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| The Kinetics Following Photolysis of Nitrosyl Bromide |
DEC 2004 |
56 pages |
| Authors:
Lori A. Mahoney; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
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| One candidate for the development of a tunable laser in the mid- infrared for use as a defensive countermeasure exploits the NO transition at 5.4 micronmeter. The difficulty with this laser is that when Br2 and NO are present in a mixture, nitrosyl bromide (BrNO) is also created. The absorption bands present in BrNO complicate the design of such a laser. This thesis determines the forward and reverse rate constants ... |
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| Stormtime Subauroral Density Troughs: Ion-Molecule Kinetics Effects |
08 OCT 2004 |
10 pages |
| Authors:
E. V. Mishin; W. J. Burke; A. A. Viggiano; BOSTON COLL CHESTNUT HILL MA INST FOR SCIENTIFIC RESEARCH
|
| We report on subauroral plasma density troughs observed by Defense Meteorological Satellite Program (DMSP) satellites during the major magnetic storm of 6 April 2000. The troughs were embedded within strongly irregular, greater than or equal to 500-km wide subauroral convection streams, composed of two distinctive parts. The poleward part coincided with strong wave structures, energetic (ring current) ion precipitations, and enhanced vertical ion flows. One or several narrow density decreases ... |
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| Self-Consistent Kinetic Approach to Stratified Regimes of a Low-Pressure Spherical Discharge |
07 APR 2004 |
2 pages |
| Authors:
G. I. Sukhinin; A. V. Fedoseev; RUSSIAN ACADEMY OF SCIENCES NOVOSIBIRSKINST OF THERMOPHYSICS
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| A spherical glow discharge with a central point-like anode has been studied in self-consistent kinetic approach. The model includes non-local Boltzmann equation coupled with non-stationary ion balance equation, and Poisson equation for radial electric field. For low-pressure argon, the model permits to obtain moving striations in a spherical glow discharge. |
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| Moving Striations in a Low-Pressure Argon Plane Discharge. Self-Consistent Kinetic Model |
07 APR 2004 |
2 pages |
| Authors:
A. V. Fedoseev; G. I. Sukhinin; RUSSIAN ACADEMY OF SCIENCES NOVOSIBIRSKINST OF THERMOPHYSICS
|
| In the paper, a self-consistent iterative kinetic model of stratified low-pressure argon glow discharge in plane geometry is presented. It is shown that striations moving from the anode to the cathode side of the positive column can he obtained from the consideration of non-local Boltzmann equation for electron distribution function and non-stationary continuity equation for ions coupled with Poisson equation for electric field. |
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| Development and Optimization of a Comprehensive Kinetic Model of Hydrocarbon Fuel Combustion |
26 MAR 2004 |
12 pages |
| Authors:
Hai Wang; DELAWARE UNIV NEWARK
|
| The goal of this research program was to develop a comprehensive, predictive, and detailed kinetic model of hydrocarbon combustion for aero propulsion simulations. Sensitivity analyses were performed to examine the influences of the uncertainty in binary diffusion coefficients on flame simulations. First-principles calculations were carried out to determine the molecular binary diffusion coefficients of H-He, H2-He, H-H2, and H-Ar gas mixtures. This study resulted in an updated transport property library ... |
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| Influence of Bond Energies on Catalytic Flame Inhibition: Implications for the Search for New Fire Suppressants |
19 DEC 2003 |
21 pages |
| Authors:
Bradley A. Williams; James W. Fleming; NAVAL RESEARCH LAB WASHINGTON DC
|
| We have conducted computational investigations of the conditions necessary for a substance to be an efficient flame suppressant. Of particular interest is identification of additional chemical elements, which might be expected to have promising suppression properties, particularly by catalytic scavenging of flame radicals. Bromine, sodium, and iron are used as examples of prototypical H + H, H + OH, and 0+ 0 scavenging cycles, respectively. For each element, a simplified ... |
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| Thermochemical Properties, Reaction Paths and Kinetic Mechanism for Sulfur-Chloro Hydrocarbon Combustion: Part I: Thermochemistry and Pyrolysis of Chlorosulfides |
OCT 2003 |
28 pages |
| Authors:
Christopher J. Montgomery; Michael J. Bockelie; Adel F. Sarofim; Jongwoo Lee; Joseph W. Bozzelli; REACTION ENGINEERING INTERNATIONAL SALT LAKE CITY UT
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| Almost no data exists in the literature on thermochemical properties enthalpy of formation, entropy or heat capacities for chlorinated sulfur hydrocarbons and oxygenated intermediates in atmospheric or thermal oxidation reactions. Even less kinetic data exists on the elementary processes involved in these reaction systems. This study describes a first attempt to generate a thermochemical property data set and an elementary reaction mechanism for pyrolysis and oxidation of diethyl sulfide and ... |
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| Detection and Decontamination Kinetics of Vx and Related Compounds by LC/MS |
01 JUL 2003 |
7 pages |
| Authors:
William Creasy; David J. McGarvey; Richard J. O'Connor; H. D. Durst; EAI CORP ABINGDON MD
|
| Liquid Chromatography/Mass Spectrometry (LC/MS) and Nuclear Magnetic Resonance Spectrometry (NMR) analytical methods were tested for the detection of EA-2192 in caustic monoethanolamine (MEA) decontamination solution. Precision and accuracy testing was done for the LC/MS method which gave a minimum detection limit (MDL) of 7.6 ng/mL after dilution, or 760 ng/mL in the original solution, which was adequate for the study and gave better sensitivity than NMR. The spike recovery was ... |
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| Kinetics of Physicochemical Infiltration and Filtration Processes |
20 FEB 2003 |
9 pages |
| Authors:
Sidney Redner; BOSTON UNIV MA DEPT OF PHYSICS
|
| This report outlines progress during the grant period on unsteady fluid flow processes in porous networks, the structure of growing networks, and the applications of statistical mechanics to fundamental non-equilibrium processes. In flow processes a statistical theory for the clogging time of a filter was constructed that successfully accounts for numerical simulations of filtration in porous networks. In related research, a comprehensive theory was developed for the infiltration and breakthrough ... |
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| Organic-Inorganic Interactions in Hydrothermal Processing |
26 OCT 2002 |
6 pages |
| Authors:
Thomas B. Brill; DELAWARE UNIV NEWARK DEPT OF CHEMISTRY
|
| The effect of inorganic species alone and on organic reactions at hydrothermal conditions was being investigated. The method involves the use of real-time IR spectroscopy in a windowed flow reactor. The specific studies were directed at the water gas shift reaction below the critical temperature of water; the kinetics of decomposition of nickel tetracarbonyl, sodium tetracarbonylcobaltate, and cyclopentadienyl cobalt dicarbonyl at hydrothermal conditions; decarboxylation and defluorination of trifluoroacetate and fluoroform; ... |
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| Kinetic Analysis of a Series of Phosphotriesterase Mutants with Respect to Sarin and Soman Catalysis |
SEP 2002 |
64 pages |
| Authors:
Steven P. Harvey; Frank M. Raushel; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| A series of site-directed mutants of the organophosphorus-hydrolyzing enzyme phosphotriesterase (PTE) were analyzed with respect to their kinetics on the G-agent substrates sarin (GB) and soman (GD). Values of Km, Vmax, and Kcat/K m were compared with the wild-type values. Several mutants were found with decreased Km values on both substrates, although all had at least somewhat decreased Vmax values as well. The K cat/Km calculations showed two mutants (G6OA ... |
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| The Kinetics and Dynamics of Elementary Gas-Phase Reactions |
SEP 2002 |
|
| Authors:
Richard P. Tuckett; BIRMINGHAM UNIV (UNITED KINGDOM)
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| This is an interdisciplinary conference, given in honor of Prof. I.W. M. Smith. Topics include: Reaction Dynamics and Energy Transfer; Gas Kinetics and Atmospheric Chemistry; Astrochemistry Theoretical Chemical Dynamics and Kinetics. |
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| Integrated Guidance and Control of Moving Mass Actuated Kinetic Warheads |
29 JUL 2002 |
17 pages |
| Authors:
P. K. Menon; G. D. Sweriduk; E. J. Ohlmeyer; D. S. Malyevac; OPTIMAL SYNTHESIS INC LOS ALTOS CA
|
| Modeling, simulation, and integrated guidance-control of a kinetic warhead utilizing moving- mass actuators are discussed. Moving masses can be used in any speed range both in the atmosphere as well as outside it, as long as there is a force, either aerodynamic or propulsive, acting on the vehicle. Since they are contained entirely within the airframe geometric envelope, and because no mass expulsion is involved, moving-mass actuation technique offers significant ... |
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| Kinetic Effects in High Gain Free-Electron Lasers |
24 JUN 2002 |
9 pages |
| Authors:
B. Hafizi; C. W. Roberson; NAVAL RESEARCH LAB WASHINGTON DC
|
| A formalism based on the Vlasov-Maxwell system has been developed that provides a fully kinetic description of a free-electron laser (FEL) operating in the high gain regime. The analysis allows for guiding of the optical beam through the gain process and guiding of the electron beam by the weak focusing provided by realistic wiggler gradients. Thus, betatron oscillations and emittance are naturally included. Additionally, intrinsic energy spread as well as ... |
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| Mass Transfer Effects on Kinetics of Dibromoethane Reduction by Zero- Valent Iron in Packed-Bed Reactors |
21 MAY 2002 |
13 pages |
| Authors:
Gregory Loraine; David Burris; Lixiong Li; John Schoolfield; APPLIED RESEARCH ASSOCIATES INC PANAMA CITY FL
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| 'Mass transfer effects on the kinetics of 1,2-dibromoethane (EDB) reduction by zero-valent iron (ZVI) in batch reactors, a laboratory scale packed-bed reactor, and a pilot scale packed-bed reactor are described. EDB was debrominated by ZVI to ethylene and bromide. EDB sorption to the cast iron surface was nonlinear and was described by a Langmuir equation. Laboratory scale column studies showed a nonlinear dependence of EDB removal on flow rate and ... |
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| Cationic Polymerization (Cure Kinetics) of Model Epoxide Systems |
APR 2002 |
52 pages |
| Authors:
Reza Dabestani; Ilia N. Ivanov; James M. Sands; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Cationic polymerization of epoxy resins can be induced by ultraviolet (UV) or electron beam (E-beam) radiation and proceeds very efficiently in the presence of an appropriate photoinitiator. Although good thermal properties have been obtained for some E-beam cured epoxy resins, other important mechanical properties, such as interlaminar shear strength, fracture toughness, and compression are poor and do not meet aerospace manufacturers materials standards. We have initiated a comprehensive study to ... |
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| Coupling of Kinetic Equations and Their Hydrodynamic Limits |
NOV 2001 |
25 pages |
| Authors:
M. Tidriri; IOWA STATE UNIV AMES DEPT OF MATHEMATICS
|
| During the last two years, the author continued his efforts to reach the above objectives. In particular he focused on the following: Further numerical and theoretical studies of the coupling of Boltzmann equation and its hydrodynamic limits. Numerical and theoretical analysis of the coupling of kinetic equations and their hydrodynamic limits for particular kinetic models. (This gives more insight into the coupling method for the full Boltzmann model). Numerical and ... |
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| Energy Transfer Kinetics and Dynamics of Relevance to Iodine Lasers |
25 AUG 2001 |
20 pages |
| Authors:
Michael C. Heaven; Keiji Morokuma; Alexey L. Kaledin; EMORY UNIV ATLANTA GA DEPT OF CHEMISTRY
|
| NCl(a) is the energy carrier in the all gas phase iodine laser (AGIL) . Studies of NCl(a,X) kinetics are being performed using photolysis of ClN3 as the source of the radical. Photodissociation of ClN3 is being characterized using photoionization mass spectrometry and time-resolved-resoled IR emission spectroscopy. The fluorescence quantum yield for NCl(a) has been estimated, and the products Cl+N3 detected. Theoretical studies of NCl+NCl reactions are in progress. For NCl(a)+NCl(a) ... |
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| Development and Optimization of a Comprehensive Kinetic Model of Hydrocarbon Fuel Combustion |
19 JUN 2001 |
4 pages |
| Authors:
Hai Wang; DELAWARE UNIV NEWARK DEPT OF MECHANICAL ENGINEERING
|
| The objective of the present research program is to develop a comprehensive, predictive, and detailed kinetic model of hydrocarbon combustion for aeropropulsion simulations. During the reporting period progress has been made in the following projects: (1) a comparative study of the influence of reaction rate constant and binary diffusion coefficient on laminar flame speed predictions and close coupled scattering calculations for the binary diffusion coefficients of H-He and H-Ar, (2) ... |
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| Charge Traps and Emission Kinetics in LuAP:Ce |
2001 |
5 pages |
| Authors:
J. Glodo; A. J. Wojtowicz; NICHOLAS COPERNICUS UNIV OF TORUN (POLAND) INST OF PHYSICS
|
| In this contribution we demonstrate the influence of shallow charge traps on emission kinetics of LuAlO3:Ce(3+) (LuAP:Ce) scintillator. Shallow traps through their interference with the recombination process not only introduce into the emission time profiles long components (afterglow) but also can change the rising and decaying parts of time profiles. The lifetime of excited Ce(3+) ion in LuAP crystal is ^ 18 ns, while the excitation at 78 nm leads ... |
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| Retrieval of Mesospheric and Lower Thermospheric Kinetic Temperature from Measurements of CO2 15 Micrometers Earth Limb Emission under Non-LTE Conditions |
14 DEC 2000 |
5 pages |
| Authors:
Christopher J. Mertens; Martin G. Mlynczak; Manuel Lopez-Puertas; Peter P. Wintersteiner; R. H. Picard; Jeremy R. Winick; Larry L. Gordley; James M. Russell III; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
| We present a new algorithm for the retrieval of kinetic temperature in the terrestrial mesosphere and lower thermosphere from measurements of CO2 15 micrometers earth limb emission. Non-local-thermodynamic- equilibrium (non-LTE) processes are rigorously included in the new algorithm, necessitated by the prospect of satellite-based limb radiance measurements to be made from the TIMED/SABER platform in the near future between 15 km and 120 km tangent altitude. The algorithm requires 20 ... |
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| A Study of the Ignition Kinetics of XM46 |
OCT 2000 |
39 pages |
| Authors:
Richard A. Beyer; Arthur Cohen; Raymond Von Wahlde; Joyce E. Newberry; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Preliminary results in an attempt to define the ignition kinetics of the liquid propellant XM46 under high-heating rates are reported. Three methods of approach have been applied: (1) conventional differential scanning calorimetry (DSC), (2) a drop of the liquid floating in an inert, heated liquid, and (3) CO2 laser heating. In the latter case, the delay to pressure release has been studied as a function of ... |
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| Proceedings of DIMAT2000 The Fifth International Conference on Diffusion in Materials |
JUL 2000 |
886 pages |
| Authors:
Y. Limoge; J. L. Bocquet; COMMISSARIAT A L'ENERGIE ATOMIQUE PARIS(FRANCE)
|
| This double volume contains the invited, oral and posters contributions, presented at the conference DIMAT2OOO, the Fifth International Conference on Diffusion in Materials, held in Paris (FRANCE) from July 17 to July 21, 2000, under the Patronage of the French Academie des Sciences and of the Haut Commissaire du Commissariat a' l'Energie Atomiquc (France). A bit more than one hundred years passed since the first thorough quantitative scientific publication on ... |
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| On the Coupling of Collisional Radiative Models and Boltzmann Equation for Atomic Transient Hydrogen Plasmas |
JUL 2000 |
9 pages |
| Authors:
G. Colonna; L. D. Pietanza; M. Capitelli; BARI UNIV (ITALY)
|
| Collisional-radiative model for atomic hydrogen has been coupled self-consistently with the Boltzmann equation for electron kinetics to study the role of nonequilibrium electron distributions on the energy level kinetics. In particular, the role of second kind and electron-electron collisions in affecting both time dependent electron energy distributions and excited state population densities has been investigated. |
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| Matrix Isolation of Boron and Carbon Vapor. Control of Cluster Formation during Preparation and Annealing |
15 MAR 2000 |
18 pages |
| Authors:
J. D. Presilla-Marquez; J. Harper; C. W. Larson; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
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| Kinetics of Formation of Cyclic C6 and Cyclic C8 and BJCn-J Clusters (J=0, 1, 2; n = 3-11) in Solid Argon |
24 JUN 1999 |
19 pages |
| Authors:
J. D. Presilla-Marquez; J. Harper; C. W. Larson; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
| Graphs featuring the kinetics of formation of cyclic C6 and C8 and BjCn-j clusters. |
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| Decomposition Mechanism and Kinetics Research and Energetic Molecules |
22 APR 1999 |
13 pages |
| Authors:
Angelo Alfano; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
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| Laser Doppler Velocimeter and High Speed Imaging System for Fluid Dynamics, Combustion and Chemical Kinetics Research |
APR 1999 |
24 pages |
| Authors:
Yaw D. Yeboah; CLARK ATLANTA UNIV GA
|
| A Laser Doppler Velocimetry (LDV) system and a high speed imaging system were acquired for the Department of Defense (DoD) Grant N00014-97-1-0511 and setup in the Combustion and Emission Control Laboratory at Clark Atlanta University. These instruments have provided an integrated diagnostic system in the areas of combustion, propulsion, emission control, chemical kinetics and fluid dynamics for time resolved flow visualization and detailed quantitative measurements of flow velocities in complex ... |
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| Kinetic Model of a Space-Based, Br(4 (2)P 1/2 -> 4 (2)P 3/2) Laser Pumped by Solar Photolysis of IBr |
MAR 1999 |
177 pages |
| Authors:
Barry N. Behnken; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
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| A kinetic model of the directly solar-pumped, atomic bromine laser- operating on the Br (4 (2)P 1/2 --> (2)P 3/2) transition under IBr photolysis- was developed, executed, and interpreted. In recognition of an evolving national interest in space-based laser development, the model presumed operation on a space station platform. Results indicate that a well-engineered IBr laser is capable of generating 1.2 kilowatts of continuous-wave (CW) power ... |
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| Destructive Expendable (DE) Countermeasures (CM) System |
MAR 1998 |
5 pages |
| Authors:
Duane A. Warner; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
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| The idea of kinetic kill as a means of aircraft self protection against anti-aircraft missiles was presented at the 1995 conference held in May at the Pensacola Naval Air Station. The concept can be envisioned as building a brick wall in the path of the incoming missile. When the missile strikes the brick wall the missile is destroyed and does no damage to the aircraft. Notice that the brick wall ... |
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| Study of the Growth, by Solid State Recrystallization, and Assessment of ZnSe Crystals as Substrates for Blue Emitting Devices |
NOV 97 |
17 pages |
| Authors:
Robert Triboulet; EUROPEAN RESEARCH OFFICE LONDON (UNITED KINGDOM)
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| For a better understanding and control, the process of solid state recrystallization of ZnSe is studied through the different aspects of growth kinetics, influence of residual impurities on the kinetics, initial texture/ orientation of the growing crystals' relationship, twinning issue, determination of the vacancy concentration, and doping. An activation energy of tilde 400 kJ/ mole is determined for the migration of the grain boundaries at the early stage of the ... |
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