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49
Sep 18, 2013
09/13
by
A. K. Popov; S. A. Myslivets; Gao Jin-yue; Zhang Han-zhuang; B. Wellegehausen
texts
eye 49
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Inversionless gain in a three-level system driven by a strong external field and by collisions with a buffer gas is investigated. The mechanism of populating of the upper laser level contributed by the collision transfer as well as by relaxation caused by a buffer gas is discussed in detail. Explicit formulae for analysis of optimal conditions are derived. The mechanism developed here for the incoherent pump could be generalized to other systems.
Source: http://arxiv.org/abs/quant-ph/0008023v1
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38
Sep 18, 2013
09/13
by
A. Mikovic; R. Picken
texts
eye 38
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We study the moduli space of a super Chern-Simons theory on a manifold with the topology ${\bf R}\times \S$, where $\S$ is a compact surface. The moduli space is that of flat super connections modulo gauge transformations on $\S$, and we study in detail the case when $\S$ is atorus and the supergroup is $OSp(m|2n)$. The bosonic moduli space is determined by the flat connections for the maximal bosonic subgroup $O(m)\times Sp(2n)$, while the fermionic moduli appear only for special parts of the...
Source: http://arxiv.org/abs/math-ph/0008006v2
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58
Sep 18, 2013
09/13
by
A. Smailagic; E. Spallucci
texts
eye 58
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We show the equivalence between Stuckelberg and Wess-Zumino methods of restoration of gauge symmetries of the anomalous, Abelian, effective action, in arbitrary even dimensions D=2k. We present dual version of Wess-Zumino terms with the compensating field described by a Kalb-Ramond like p=2k-2 form.
Source: http://arxiv.org/abs/hep-th/0008043v1
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77
Oct 18, 2021
10/21
by
ABSOFT
software
eye 77
favorite 1
comment 0
ISO conforme du CD d'installation de WinZip 8.0.
Topics: WinZIp, 8.0, Français
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80
Sep 22, 2013
09/13
by
Adrian Dragulescu; Victor M. Yakovenko
texts
eye 80
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In a closed economic system, money is conserved. Thus, by analogy with energy, the equilibrium probability distribution of money must follow the exponential Gibbs law characterized by an effective temperature equal to the average amount of money per economic agent. We demonstrate how the Gibbs distribution emerges in computer simulations of economic models. Then we consider a thermal machine, in which the difference of temperatures allows one to extract a monetary profit. We also discuss the...
Source: http://arxiv.org/abs/cond-mat/0001432v4
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23
Aug 13, 2017
08/17
by
Adrian Sutton
software
eye 23
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comment 0
This stack is designed to make creating plug-ins for any home stack as easy as possible. Simply create the interface elements on the card layer, complete with the scripts they require and create card scripts required in the script of this card. Only card buttons and card fields are currently supported. When finished adjust the size of the size box to the size of space you wish to use on the home stack. Finally, click on the "Make Plug-In Installer" button.
Topics: hypercard, hypercard_stack, hypercard_stack-building-tools
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56
Sep 18, 2013
09/13
by
Alessandro de Angelis
texts
eye 56
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This report summarizes four recent papers on the characteristics of the hadronic decays of the Z by the LEP collaborations ALEPH, DELPHI and OPAL.
Source: http://arxiv.org/abs/astro-ph/0008077v1
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85
Sep 18, 2013
09/13
by
Amina Helmi
texts
eye 85
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In this contribution we discuss the expected properties of our halo if our Galaxy had been built from mergers of smaller systems. Using both analytic arguments and high-resolution simulations, we find that the Galactic halo in the Solar neighbourhood should have a smooth spatial distribution and that its stellar velocity ellipsoid should consist of several hundred kinematically cold streams, relicts from the different merging events. We also discuss observational evidence which supports this...
Source: http://arxiv.org/abs/astro-ph/0008086v1
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41
Jan 27, 2017
01/17
by
Angelita Gómez Sánchez
image
eye 41
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comment 0
Noticias sobre la celebración de la Velá de las Nieves del año 2000, en Arcos de la Frontera (España), donde se concedió la Medalla de Oro del Baile a la bailaora flamenca Angelita Gómez. Incluye artículos de Pepe Marín, Eduardo Duarte y Manuel Martín Martín.
Topics: flamenco, cante, toque, guitarra, baile, Jerez, Andalucia
Atari Online News Etc. (A-ONE) Volume 2 Issue 31 published 4 August 2000.
Topics: Atari ST, Atari, e-zine
Alistair Cooke considers the outdated presidential nominating conventions and remembers the dramatic evenings of the longest ballot in US history.
One Set Show: 01. Earth Jam 02. Big Country 03. Scratch and Sniff 04. banter - band intros 05. Lover's Leep 06. Stomping Grounds 07. Futureman Solo 08. Two Horny Blues 09. Hoedown 10. encore break/crowd Encore: 11. t11 12. t12 13. outro/crowd
Topics: Flecktones, Bela Fleck, Victor Wooten, Futureman, Roy Wooten, Jeff Coffin, FOB, Schoeps, mk21,...
Source: Audience/FOB
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81
Sep 18, 2013
09/13
by
Bob Coecke; Isar Stubbe
texts
eye 81
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We enlarge the hom-sets of categories of complete lattices by introducing `state transitions' as generalized morphisms. The obtained category will then be compared with a functorial quantaloidal enrichment and a contextual quantaloidal enrichment that uses a specific concretization in the category of sets and partially defined maps ($Parset$).
Source: http://arxiv.org/abs/math/0008039v1
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377
Feb 27, 2019
02/19
by
Bottle Rockets
etree
eye 377
favorite 0
comment 0
BOTTLE ROCKETS 8/4/00 COLUMBIA, MO DISC ONE: 01 Gravity Fails 02 Kit Kat Clock 03 Every Kinda Everything 04 Slo Tom's 05 Alone In Bad Company 06 Kerosene 07 I Wanna Come Home 08 Indianapolis 09 Nancy Sinatra 10 Smoking 100's Alone 11 1000 Dollar Car 12 24 Hours A Day 13 If Walls Could Talk 14 Gas Girl 15 Trailer Mama DISC TWO: 01 Get Down, River 02 Idiot's Revenge 03 Love Like A Truck 04 I'll Be Coming Around 05 Welfare Music 06 Gotta Get Up 07 Take Me To The Bank 08 Early In The Morning 09...
Topic: Live concert
A liveset of ambient by Brothomstates, circulating in Finnish electronic music forums. This was recorded live at Koneisto in the year 2000 in Turku.
Topics: brothomstates, ambient, finnish, mixtape
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88
Sep 18, 2013
09/13
by
C. Vignali; A. Comastri; F. Nicastro; G. Matt; F. Fiore; G. G. C. Palumbo
texts
eye 88
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BeppoSAX and ASCA observations of the nearby (z=0.184), high-luminosity, radio-quiet quasar PDS456 are presented. The X-ray spectrum is characterized by a prominent ionized edge at 8-9 keV (originally discovered by RXTE, Reeves et al. 2000) and by a soft excess below 1.5 keV. The lack of any significant iron K alpha emission line suggests for the edge an origin from line-of-sight material rather than from reflection from a highly ionized accretion disc. The hard X-ray continuum is indeed well...
Source: http://arxiv.org/abs/astro-ph/0008090v1
Description : Carmel's weekly newspaper provides details about more than a century of the town's social, cultural and political life, including the town's responses to issues of national and international importance (WWI and WWII, the Great Depression, etc.). Series Title : Carmel Pine Cone Source : 44 Pages of 44: 11 x 17 in. Rights : Copyrighted. Rights are owned by Carmel Communications, Inc. Copyright Holder has given Institution permission to provide access to the digitized work online....
Topic: californiarevealed
Source: 44 Pages of 44: 11 x 17 in.
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37
Sep 18, 2013
09/13
by
Chao-Shang Huang; Wu-Jun Huo; Yue-Liang Wu
texts
eye 37
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We investigate the $\epsilon^{\prime} /\epsilon$ for $K\to \pi\pi$ in a sequential fourth generation model. By giving the basic formulae for $\epsilon^{\prime}/\epsilon$ in this model, we analyze the numerical results which are dependent of $m_{t^{\prime}}$ and imaginary part of the fourth CKM factor, ${Im}V^{*}_{t^{'}s}V_{t^{'}d}$ (or $V^{*}_{t^{'}s}V_{t^{'}d}$ and the fourth generation CKM matrix phase $\theta$). We find that, unlike the SM, when taking the central values of all parameters...
Source: http://arxiv.org/abs/hep-ph/0005227v2
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43
Sep 18, 2013
09/13
by
Chris A. Clarkson
texts
eye 43
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This thesis concerns the compatibility of inhomogeneous cosmologies with our present understanding of the universe. It is a problem of some interest to find the class of all relativistic cosmological models which are capable of providing a reasonable `fit' to the universe. This thesis, in some respects, is part of this process. We consider Stephani models, which are a generalisation of the standard Friedmann-Lemaitre-Robertson-Walker (FLRW) models, which can be thought of as FLRW models with...
Source: http://arxiv.org/abs/astro-ph/0008089v1
Government Publishing Office U.S. Congress House of Representatives Committee on Government Reform DECEPTIVE SWEEPSTAKES MAILINGS Date(s) Held: 2000-08-04 106th Congress, 1st Session GPO Document Source: CHRG-106hhrg61695 Superintendents of Documents ID: Y 4.G 74/7 Related Items: Congressional Serial No. 106-69
Topics: 106th, House
Government Publishing Office U.S. Congress Senate Congressional Committee REAUTHORIZE THE INDIAN HEALTH CARE IMPROVEMENT ACT Date(s) Held: 2000-08-04 106th Congress, 2nd Session GPO Document Source: CHRG-106shrg66474 Related Items: United States Senate Bill 2526 (106th Congress)
Topics: 106th, Senate
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61
Sep 18, 2013
09/13
by
Cristopher Moore; David Eppstein
texts
eye 61
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We solve the problem of one-dimensional peg solitaire. In particular, we show that the set of configurations that can be reduced to a single peg forms a regular language, and that a linear-time algorithm exists for reducing any configuration to the minimum number of pegs.
Source: http://arxiv.org/abs/math/0006067v2
7
7.0
Jan 21, 2022
01/22
by
DWJZ - Directie Wetgeving en Juridische Zaken
texts
eye 7
favorite 0
comment 0
Coleccion Wetgeving / Coleccion Publicacion di Gobierno , Biblioteca Nacional Aruba Landscourant van Aruba Jaargang 2000 Editie no. 16 04 Augustus 2000 Uitgever: DWJZ - Directie Wetgeving en Juridische Zaken Corant oficial di Gobierno
Topics: government publications, Land Aruba, landscourant, Corant Oficial, Official Journals,...
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51
Sep 18, 2013
09/13
by
Dagoberto S Freitas; Jairo R de Oliveira
texts
eye 51
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comment 0
The properties of pulse propagation in a nonlinear fiber including linear damped term added in the usual nonlinear Schr\"odinger equation is analyzed analytically. We apply variational modified approach based on the lagrangian that describe the dynamic of system and with a trial function we obtain a solution which is more accuracy when compared with a pertubative solution. As a result, the problem of pulse propagation in a fiber with loss can be described in good agreement with exact...
Source: http://arxiv.org/abs/physics/0008011v1
85
85
Sep 18, 2013
09/13
by
Daniel J. Mortlock; Rachel L. Webster
texts
eye 85
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comment 0
The fraction of high-redshift sources which are multiply-imaged by intervening galaxies is strongly dependent on the cosmological constant, and so can be a useful probe of the cosmological model. However its power is limited by various systematic (and random) uncertainties in the calculation of lensing probabilities, one of the most important of which is the dynamical normalisation of elliptical galaxies. Assuming ellipticals' mass distributions can be modelled as isothermal spheres, the mass...
Source: http://arxiv.org/abs/astro-ph/0008079v1
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75
Sep 18, 2013
09/13
by
Daniel J. Mortlock; Rachel L. Webster
texts
eye 75
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comment 0
Gravitationally-lensed quasars can be discovered as a by-product of galaxy redshift surveys. Lenses discovered spectroscopically in this way should require less observational effort per event than those found in dedicated lens surveys. Further, the lens galaxies should be relatively nearby, facilitating a number of detailed observations that are impossible for the more common high-redshift lenses. This is epitomised by the wide range of results that have been obtained from Q 2237+0305, which...
Source: http://arxiv.org/abs/astro-ph/0008082v1
50
50
Sep 18, 2013
09/13
by
Daniel J. Mortlock; Rachel L. Webster
texts
eye 50
favorite 0
comment 0
The absence of any wide-separation gravitational lenses in the Large Bright Quasar Survey is used to place limits on the population of cluster-sized halos in the universe, and hence constrain a number of cosmological parameters. The results agree with previous investigations in strongly ruling out the standard cold dark matter model but they are consistent with low-density universes in which the primordial fluctuation spectrum matches both cluster abundances and cosmic microwave background...
Source: http://arxiv.org/abs/astro-ph/0008081v1
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43
Sep 18, 2013
09/13
by
Daniela Bertacchi; Fabio Zucca
texts
eye 43
favorite 0
comment 0
We investigate the asymptotical behaviour of the transition probabilities of the simple random walk on the 2-comb. In particular we obtain space-time uniform asymptotical estimates which show the lack of symmetry of this walk better than local limit estimates. Our results also point out the impossibility of getting Jones-type non-Gaussian estimates.
Source: http://arxiv.org/abs/math/0008042v1
286
286
Apr 14, 2016
04/16
by
David Nelson Band
etree
eye 286
favorite 0
comment 0
David Nelson Band Harper’s Ferry Allston, MA 8/4/00 Soundboard Recording Disc 1 / Set 1 01. Panama Red 02. Any Naked Eye 03. Kerouac 04. Born Sidestepper 05. Different World -> 06 Long Gone Sam -> 07. Cumberland Blues Disc 2 / Set 2 01. Earl's Girls 02. Film at 11 03. Beat It on Down the Line 04. Kick in the Head -> 05. Road to Armageddon -> 06. Jupiter Hollow -> 07. The Wheel -> 08. Kick in the Head
Topic: David Nelson Band
Source: Soundboard Recording
A study was performed to elucidate the mechanisms of extinction and autoignition of n-heptane in strained laminar flows under non-premixed conditions. A previously developed detailed mechanism made up of 2540 reversible elementary reactions among 556 species was the starting point for the study. The detailed mechanism was previously used to calculate ignition delay times in homogeneous reactors, and concentration histories of a number of species in plug-flow and jet-stirred reactors. An...
Topics: DTIC Archive, Seiser, R, LAWRENCE LIVERMORE NATIONAL LAB CA, *EXTINCTION, *AUTOIGNITION, *HEPTANES,...
Impact or thermal ignition of high explosives results in deformation that can lead to fracture. Fracture, combined with high pressure, dramatically increases the available surface area and potentially changes the mode of combustion. Recent impact and cook-off experiments on PBX 9501 (HMX, octahydro-1,3,5,7- tetranitro-1,3,5,7-tetrazocine, with a binder) have shown complex cracking patterns caused by impact or pressurization. Fast reactive waves have been observed to propagate through the cracks...
Topics: DTIC Archive, Berghout, H L, LOS ALAMOS NATIONAL LAB NM, *PHYSICOCHEMICAL PROPERTIES, *HIGH...
The effects of unsteady strain rate on the burning velocity of hydrogen/air premixed flames have been studied in an opposed nozzle configuration. The numerical method employs adaptive time integration of a system of differential algebraic equations. Detailed hydrogen/air kinetic mechanism and transport properties are considered. The equivalence ratio is varied from lean to rich premixtures in order to change the effective Lewis number. Steady Markstein numbers for small strain rate are computed...
Topics: DTIC Archive, Im, Hong G, SANDIA NATIONAL LABS LIVERMORE CA COMBUSTION RESEARCH FACILITY,...
Ab initio quantum chemical simulations were coupled with variational transition state theory in estimating rate constants for the H + C3H3 and H + C3H5 recombination reactions. The energy of interaction between the H atom and each of the radicals was evaluated at the CAS + 1 + 2 level for the range of separations and relative orientations spanning the transition state region. An analytic representation of these interaction energies was then implemented in variable reaction coordinate transition...
Topics: DTIC Archive, Harding, Lawrence B, ARGONNE NATIONAL LAB IL CHEMISTRY DIV, *REACTION KINETICS,...
This paper describes a computational study of the partial oxidation of ethane to ethylene in a shortcontact- time reactor (SCTR), using a two-dimensional computational fluid dynamics model with full heat and mass transport. Detailed heterogeneous and homogeneous chemical kinetic mechanisms are employed to describe the chemistry. Emphasis is placed on simulating recent experiments in which the platinum catalyst is added to the front face of the reactor while it is operating ( on-line catalyst...
Topics: DTIC Archive, Zerkle, David K, LOS ALAMOS NATIONAL LAB NM CHEMICAL SCIENCE AND TECHNOLOGY DIV,...
The existence and spatial development of hydrocarbon cool flames in a spherical vessel under the influence of mass and thermal diffusion have been investigated by numerical methods. The purpose is to examine the nature of the interaction of the physics and chemistry that may drive an oscillatory reaction. The conditions correspond to those that would be experienced at zero gravity, as has been recently put to experimental test. Comparisons and contrasts with responses under perfectly mixed...
Topics: DTIC Archive, Fairlie, R, LEEDS UNIV (UNITED KINGDOM), *HYDROCARBONS, *FLAMES, MATHEMATICAL MODELS,...
Scattering to extinction cross section ratios, qse, were measured using the NIST Large Agglomerate Optics Facility for soot produced from ethene and acetylene laminar diffusion flames. Measurements were performed using light sources at 543.5 nm, 632.8 nm, and 856 nm. The average scattering to extinction cross section ratios for these wavelengths are equal to 0.245, 0.195, and 0.195 for ethene and 0.311, 0.228, and 0.237 for acetylene. The 856 nm measurements represent the longest wavelength for...
Topics: DTIC Archive, Zhu, Jinyu, ILLINOIS UNIV AT CHICAGO DEPT OF MECHANICAL ENGINEERING, *SOOT, *INFRARED...
The interaction of a vortex pair with a premixed flame serves as an important prototype for premixed turbulent combustion. In this study, we investigate the interaction of a counter-rotating vortex pair with an initially flat premixed methane flame. We compare computational solutions obtained using a time-dependent, two-dimensional adaptive low Mach number combustion algorithm that incorporates GRI-Mech 1.2 for the chemistry, thermodynamics, and transport of the chemical species. We discuss the...
Topics: DTIC Archive, Bell, John B, CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB, *COMBUSTION STABILITY,...
Detailed studies of flame-vortex interactions are extremely valuable to improve our understanding of turbulent combustion regimes. Combined experimental and numerical studies have already been performed in the premixed case during previous investigations. Therefore, we decided to carry out a detailed experimental investigation on the regimes observed during interaction of a vortex ring and a non-premixed, diluted, hydrogen/air, laminar counterflow flame. To obtain the needed information,...
Topics: DTIC Archive, Thevenin, D, LABORATOIRE EM2C CNRS ECOLE CENTRALE PARIS AND CNRS CHATENAY-MALABRY...
A modeling study of benzene and phenyl radical formation was performed for three low-pressure premixed laminar flat flames having an unsaturated C2 or C3 hydrocarbon fuel (acetylene, ethylene, and propene). Predictions using three published detailed elementary-step chemical kinetics mechanisms were tested against molecular beam mass spectrometry (MBMS) species profile data for all three flames. The differences between the predictive capabilities of the three mechanisms were explored, with an...
Topics: DTIC Archive, Pope, Christopher J, SANDIA NATIONAL LABS LIVERMORE CA COMBUSTION RESEARCH FACILITY,...
In this paper we present new burn rate results for several energetic materials. The burn rates of octahydro- 1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), HMX and estane-based binder (PBX 9501), 1,3,5-triamino- 2,4,6-trinitrobenzene (TATB), and TATB and KelF binder (PBX 9502), are reported and compared with existing data. Burn rate data of these common explosives complement and extend existing data sets. Burn rate data of three novel high-nitrogen materials are presented in this work....
Topics: DTIC Archive, Son, S F, LOS ALAMOS NATIONAL LAB NM, *BURNING RATE, *MONOPROPELLANTS, IMPACT TESTS,...
Simultaneous images of the CH and OH reaction zones are reported for Intensely Wrinkled nonpremixed flames, to determine whether reaction zones retain their thin laminar flamelet structure or become distributed reaction zones. Intensely Wrinkled Flames (IWFs) were achieved by using a special burner with large coflow air velocities to obtain a normalized turbulence intensity of 3.6, which is 10 times greater than the turbulence intensity within jet flames. The images were used to measure...
Topics: DTIC Archive, Ratner, A, MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING, *JET FLAMES,...
We investigated the modeling of counterflow diffusion flames in which the products of ammonium perchlorate (AP) combustion were counterflowed against an ethylene fuel stream. The two-dimensional problem can be reduced to a one-dimensional boundary value problem along the stagnation point streamline through the introduction of a similarity transformation. By utilizing recent developments in hydrocarbon, chlorine, NOx and AP kinetics, we formulated a detailed transport, finite-rate chemistry...
Topics: DTIC Archive, Smooke, M D, YALE UNIV NEW HAVEN CT DEPT OF MOLECULAR BIOPHYSICS AND BIOCHEMISTRY,...
A small volume electrolysis technique that allows the quantitative determination of soluble by-products of electrochemical reactions on low surface area electrodes was developed during the project period. Chromatographic and wet-chemical assays were used to analyze for reaction by-products following brief electrolysis periods (5-10 min) of small (50-100 microliters) sample volumes. The technique was applied to investigate effects of surface structure and composition on the oxidation pathways of...
Topics: DTIC Archive, Korzeniewski, Carol, TEXAS TECH UNIV LUBBOCK OFFICE OF RESEARCH SERVICES,...
During the review, the Defense Logistics Agency was the DoD executive agency responsible, through its Defense Contract Management Command, for conducting Contractor Insurance/Pension Reviews with the assistance of the Defense Contract Audit Agency. Effective March 27, 2000, the Defense Contract Management Agency was established, and it is now the responsible agency for conducting Contractor Insurance/Pension Reviews. The purpose of the reviews is to evaluate contractor insurance programs,...
Topics: DTIC Archive, INSPECTOR GENERAL DEPT OF DEFENSE ARLINGTON VA, *CONTRACT ADMINISTRATION, *MEDICAL...
We report species concentration data obtained during the vaporization and thermal decomposition of polydisperse multicomponent chlorinated hydrocarbon (CHC)/alcohol sprays. Mixtures of 1,1,1-trichloroethane (C2H3Cl3) (TCA) and isopropanol (C3H7OH) are atomized in the postflame environment of a methane/air (U 0.95) flame. Species concentrations, determined by extractive Fourier transform infrared analysis, reveal perturbations in TCA destruction and by-product species formation. The effect of...
Topics: DTIC Archive, Clack, Herek L, CALIFORNIA UNIV BERKELEY LAWRENCE BERKELEY LAB, *MIXTURES, *SPRAYS,...
Thermodynamic properties and detailed chemical kinetic models have been developed for the combustion of two oxygenates: methyl butanoate, a model compound for biodiesel fuels, and methyl formate, a related simpler molecule. Bond additivity methods and rules for estimating kinetic parameters were adopted from hydrocarbon combustion and extended. The resulting mechanisms have been tested against the limited combustion data available in the literature, which was obtained at low temperature,...
Topics: DTIC Archive, Fisher, E M, CORNELL UNIV ITHACA NY DEPT OF MECHANICAL AND AEROSPACE ENGINEERING,...
The reaction between H2 and O2 has been studied in a reflected shock tube apparatus between temperatures of 1662 - 2097 K and pressures of 400 - 570 torr with Kr as the diluent gas. O atom atomic resonance absorption spectrometry (ARAS) was used to observe absolute [O]sub t under conditions of low [H2]sub 0 so that most secondary reactions were negligible. Hence, the observed [O]sub t was the direct result of the rate controlling reaction between H2 and O2. Three different reactions were...
Topics: DTIC Archive, Michael, J V, ARGONNE NATIONAL LAB IL CHEMISTRY DIV, *HYDROGEN, *OXYGEN,...
Laser-induced fluorescence (LIF) imaging was applied to investigate NO formation in a directly injected diesel engine with realistic combustion chamber geometry. The technique, which uses KrF excimer laser excitation, was previously successfully applied in gasoline engines. Influences of interfering species depending on the spectral range used for LIF detection was investigated by spectrally resolved LIF detection. Laser and signal attenuation were assessed in separate experiments using...
Topics: DTIC Archive, Hildenbrand, Frank, HEIDELBERG UNIV (GERMANY) INST PHYSIKALISH-CHEMISCHES, *DIESEL...
Semianalytical expressions are developed for creeping flame spread parallel to a fuel cylinder axis so that spread rates measured or predicted for flat surfaces over the same material can be directly used for cylindrical surfaces. Two phenomena are identified that cause an increased flame spread rate in the cylindrical over the flat surface geometry: (1) increased heat transfer from the gas phase and (2) faster temperature increase of the solid phase. Analytical expressions from approximate...
Topics: DTIC Archive, Delichatsios, Michael A, NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD,...
We report experimental observations of synchronization among combustion variations in different cylinders at fuel-lean conditions in an eight-cylinder spark ignition engine. Our results appear to confirm that synchronization readily occurs and that it becomes stronger as the overall equivalence ratio is reduced from stoichiometric. It also appears that the onset of synchronization is associated with bifurcation instabilities reported previously for combustion in single cylinders. We use both...
Topics: DTIC Archive, Daw, C S, OAK RIDGE NATIONAL LAB TN ENGINEERING TECHNOLOGY DIV, *SYNCHRONISM, *SPARK...
