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Sep 21, 2009
09/09

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*Credit for ground-based image:* NOAO/AURA [ http://www.aura-astronomy.org/ ]/NSF, C. Olson, J. Lapre and A. Block (NOAO)

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*Description*: This composite image shows a ground-based image of NGC 2403 and the location of a 10,000 light-year-wide square region imaged with the Hubble Space Telescope's Advanced Camera for Surveys. The area is host to Supernova 2004dj, the closest explosion of a massive star in over a decade, which blazes with the light of 200 million Suns. Technical facts about this news release: About the Object Object Name: SN 2004dj in NGC 2403 Object Description: Supernova in spiral galaxy Position...

Topics: SN 2004dj, NGC 2403, What -- Hubble Space Telescope (HST), What -- Advanced Camera for Surveys,...

Source: http://hubblesite.org/newscenter/archive/releases/2004/23/image/d/

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92

Sep 21, 2009
09/09

by
*Credit for ground-based image:* WIYN/NOAO/AURA [ http://www.aura-astronomy.org/ ]/NSF, T. Rector (University of Alaska, Anchorage), Z. Levay and L. Frattare (STScI [ http://www.stsci.edu/ ]) *Credit for Hubble image:* NASA [ http://www.nasa.gov/ ], ESA [ http://www.spacetelescope.org/ ], A.V. Filippenko (University of California, Berkeley), P. Challis (Harvard-Smithsonian Center for Astrophysics), et al. [...

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*Description*: The image at left represents a small region of NGC 2403, a galaxy located 11 million light-years from Earth. The photo was taken two months before a massive star exploded. The image pinpoints the location of the stellar blast, known as supernova 2004dj, within a cluster of massive, generally blue (but some red) stars called Sandage 96. The cluster's total mass is estimated at about 24,000 times the mass of the Sun. The stars in this cluster are so far away that their light blends...

Topics: SN 2004dj, NGC 2403, What -- Earth, What -- Sun, What -- Hubble Space Telescope (HST), What --...

Source: http://hubblesite.org/newscenter/archive/releases/2004/23/image/b/

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176

Sep 21, 2009
09/09

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*Credit:* NASA [ http://www.nasa.gov/ ], ESA [ http://www.spacetelescope.org/ ], A.V. Filippenko (University of California, Berkeley), P. Challis (Harvard-Smithsonian Center for Astrophysics), et al. [ http://comet.stsci.edu/cgi-bin/fetch.cgi?url=http%3A%2F%2Fpresto.stsci.edu%2Fcgi-bin%2Fget-address-info%3F10182 ]

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*Description*: The explosion of a massive star blazes with the light of 200 million Suns in this NASA Hubble Space Telescope image. The arrow at top right points to the stellar blast, called a supernova. The supernova is so bright in this image that it easily could be mistaken for a foreground star in our Milky Way Galaxy. And yet, this supernova, called SN 2004dj, resides far beyond our galaxy. Its home is in the outskirts of NGC 2403, a galaxy located 11 million light-years from Earth....

Topics: SN 2004dj, NGC 2403, What -- Hubble Space Telescope (HST), What -- Earth, What -- Sun, What --...

Source: http://hubblesite.org/newscenter/archive/releases/2004/23/image/a/

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59

Sep 21, 2009
09/09

by
*Image Credit:* NASA [ http://www.nasa.gov/ ], ESA [ http://www.spacetelescope.org/ ], A.V. Filippenko (University of California, Berkeley) and Z. Levay (STScI [ http://www.stsci.edu/ ])

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*Description*: This detailed view of spiral galaxy NGC 2403 shows the location of Supernova 2004dj, numerous star clusters, and several other stars that exploded in previous years. The region was observed with the Hubble Space Telescope's Advanced Camera for Surveys on Aug. 17, 2004. Technical facts about this news release: About the Object Object Name: SN 2004dj in NGC 2403 Object Description: Supernova in spiral galaxy Position (J2000): R.A. 7h 36m 57s.22 Dec. +65° 36' 21".53...

Topics: SN 2004dj, NGC 2403, What -- Hubble Space Telescope (HST), What -- Advanced Camera for Surveys,...

Source: http://hubblesite.org/newscenter/archive/releases/2004/23/image/c/

51
51

Sep 22, 2013
09/13

by
A. Barducci; R. Giachetti

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We study the interaction of a scalar and a spinning particle with a coherent linearized gravitational wave field treated as a classical spin two external field. The spin degrees of freedom of the spinning particle are described by skew-commuting variables. We derive the explicit expressions for the eigenfunctions and the Green's functions of the theory. The discussion is exact within the approximation of neglecting radiative corrections and we prove that the result is completely determined by...

Source: http://arxiv.org/abs/hep-th/0409027v1

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52

Sep 22, 2013
09/13

by
A. Bragaglia; E. V. Held; M. Tosi

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Multi slit spectroscopy at the Telescopio Nazionale Galileo was employed to measure radial velocities for 20 stars in the direction of the old open cluster Berkeley 29, the farthest known in our Galaxy. Membership information was derived for stars along all the red giant branch, in particular near its tip, and on the red clump. The sample of bona-fide cluster members was used to revise the cluster distance to about 15 kpc, on the basis of an empirical comparison with the red clump in open...

Source: http://arxiv.org/abs/astro-ph/0409046v1

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51

Sep 21, 2013
09/13

by
A. Enciso; F. Finkel; A. Gonzalez-Lopez; M. A. Rodriguez

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We construct new solvable rational and trigonometric spin models with near-neighbors interactions by an extension of the Dunkl operator formalism. In the trigonometric case we obtain a finite number of energy levels in the center of mass frame, while the rational models are shown to possess an equally spaced infinite algebraic spectrum. For the trigonometric and one of the rational models, the corresponding eigenfunctions are explicitly computed. We also study the scalar reductions of the...

Source: http://arxiv.org/abs/hep-th/0407274v2

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Sep 21, 2013
09/13

by
A. V. Belitsky; V. M. Braun; A. S. Gorsky; G. P. Korchemsky

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Yang--Mills theories in four space-time dimensions possess a hidden symmetry which does not exhibit itself as a symmetry of classical Lagrangians but is only revealed on the quantum level. It turns out that the effective Yang--Mills dynamics in several important limits is described by completely integrable systems that prove to be related to the celebrated Heisenberg spin chain and its generalizations. In this review we explain the general phenomenon of complete integrability and its...

Source: http://arxiv.org/abs/hep-th/0407232v2

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51

Sep 21, 2013
09/13

by
A. V. Isaev; N. G. Kruzhilin

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We characterize pairs of bounded Reinhardt domains in $\CC^2$ between which there exists a proper holomorphic map and find all proper maps that are not elementary algebraic.

Source: http://arxiv.org/abs/math/0407040v3

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Aug 2, 2018
08/18

by
ACTV

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League of Women Voters: Candidates Night 2004

Topics: LWV, League of Women Voters, Amherst, Candidates Night, September, 2004, ACTV, Amherst Media

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66

Jul 20, 2013
07/13

by
Aaron D. Jaggard

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Inspired by work of McKay, Morse, and Wilf, we give an exact count of the involutions in S_n which contain a given permutation \tau in S_k as a subsequence; this number depends on the patterns of the first j values of \tau for 1

Source: http://arxiv.org/abs/math/0107130v2

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Sep 18, 2013
09/13

by
Aaron D. Jaggard

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Let I_n(\pi) denote the number of involutions in the symmetric group S_n which avoid the permutation \pi. We say that two permutations \alpha,\beta\in\S{j} may be exchanged if for every n, k, and ordering \tau of j+1,...,k, we have I_n(\alpha\tau)=I_n(\beta\tau). Here we prove that 12 and 21 may be exchanged and that 123 and 321 may be exchanged. The ability to exchange 123 and 321 implies a conjecture of Guibert, thus completing the classification of S_4 with respect to pattern avoidance by...

Source: http://arxiv.org/abs/math/0306002v2

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Sep 22, 2013
09/13

by
Abhas Mitra

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In a recent paper[1], it has been shown that, there cannot be any rotating (Kerr) Black Hole (BH) with finite mass in order that the generic properties associated with the symmetries of stationary axisymmetric Einstein equations are obeyed, i.e, in order to have m\ge 0, we must have $a=0$. In other words, all observed chargeless BHs with finite masses must be non-rotating Schwarzschild BHs. Here, by comparing the invariant 4 volume associated with original Kerr metric [2] with the...

Source: http://arxiv.org/abs/astro-ph/0409049v1

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58

Sep 22, 2013
09/13

by
Ai-Ko Liu

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In this paper, we study the enumeration of virtual numbers of immersed nodal curves along certain Calabi-Yau K3 fibrations. By using the concept of cosmic strings, we verify the modularity conjeture of the generating function of immersed nodal curves from String theory (Harvey-Moore). Based on the theory defining virtual numbers of nodal curves on algebraic surface (applying to a pencil of lattice polarized K3), a mathematical definition of virtual numbers of immersed rational curves (so-called...

Source: http://arxiv.org/abs/math/0409038v1

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47

Sep 20, 2013
09/13

by
Ai-Ko Liu

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The paper is a short supplement of the longer paper "The Algebraic Proof of the Universality Theorem", preprint math.AG/0402045. In this short note, we outline the geometric meaning of Universality theorem (conjecture by Gottsche) as a non-linear extension of surface Riemann-Roch Theorem, inspired by the string theory argument of Yau-Zaslow to probe non-linear information from linear systems of algebraic surfaces. The universality theorem is an existence result which reflects the...

Source: http://arxiv.org/abs/math/0405113v2

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48

Sep 22, 2013
09/13

by
Ai-Ko Liu

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The paper is a part of our program to build up a theory of couting immersed nodal curve on algebraic surfaces, as an enumerative Riemann-Roch theory (outlined in math.AG/0405113). In this paper, we discuss the excess intersection theory of the so-called type two exceptional curves, which plays the analogous role as the "index of speciality" (h^2) in the classical surface Riemann-Roch formula. We show that the algebraic family Seiberg-Witten theory of type I exceptional curves can be...

Source: http://arxiv.org/abs/math/0409037v1

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28

Apr 20, 2021
04/21

by
Alan Watt ~Cutting Through the Matrix

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7 Alan Watt on Sweet Liberty with Jackie Patru, September 2, 2004

Topics: Alan Watt, Sweet Liberty, Jackie Patru, Cutting Through the Matrix

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42

Sep 22, 2013
09/13

by
Alejandro Rivero

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It is open the possibility of imposing requisites to the quantisation of Connes' Spectral Triples in such a way that a critical dimension D=26 appears.

Source: http://arxiv.org/abs/physics/0409022v1

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80

Sep 22, 2013
09/13

by
Alex Markowitz; Rick Edelson

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The first seven years of RXTE monitoring of Seyfert 1 active galactic nuclei have been systematically analyzed to yield five homogeneous samples of 2-12 keV light curves, probing hard X-ray variability on successively longer durations from ~1 day to ~3.5 years. 2-10 keV variability on time scales of ~1 day, as probed by ASCA, are included. All sources exhibit stronger X-ray variability towards longer time scales, but the increase is greater for relatively higher luminosity sources. Variability...

Source: http://arxiv.org/abs/astro-ph/0409045v1

47
47

Sep 22, 2013
09/13

by
Alice Harding; Alexander Muslimov

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A new picture of pulsar high-energy emission is proposed that is different from both the traditional polar cap and outer gap models, but combines elements of each. The slot gap model is based on electron acceleration along the edge of the open field region from the neutron star surface to near the light cylinder. Along the last open field line, the pair formation front rises to very high altitude forming a slot gap, where the accelerating electric field is unscreened by pairs. The resulting...

Source: http://arxiv.org/abs/astro-ph/0409047v1

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54

Sep 22, 2013
09/13

by
Andrea Merloni

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I present a new method to unveil the history of cosmic accretion and the build-up of Supermassive Black Holes (SMBH) in the nuclei of galaxies, based on observations of the evolving radio and (hard) X-ray luminosity functions of AGN. The fundamental plane of black hole activity discovered by Merloni, Heinz & Di Matteo (2003) is used as a mass and accretion rate estimator. I adopt the local BH mass function as a boundary condition to integrate backwards in time the continuity equation for...

Source: http://arxiv.org/abs/astro-ph/0409044v1

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49

Sep 22, 2013
09/13

by
Angel R. Lopez-Sanchez; Cesar Esteban; Monica Rodriguez

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We present new broad-band optical and near-infrared CCD imaging together with deep optical intermediate-resolution spectroscopy of Mkn 1087 and its surrounding objects. We analyze the morphology and colors of the stellar populations of the brightest objects, some of them star-formation areas, as well as the kinematics, physical conditions and chemical composition of the ionized gas associated with them. Mkn 1087 does not host an Active Galactic Nucleus, but it could be a Luminous Compact Blue...

Source: http://arxiv.org/abs/astro-ph/0409050v1

1,413
1.4K

Sep 7, 2004
09/04

by
Atta Stratta

etree

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Set 1: John Berndt, solo sax Set 2: Mike Muniak, electronics/turntable/laptop Josh Atkins, guitar Greg Druck, pots and pans Greg Pizzoli, voice/electronics

Topic: Live concert

Source: atr25 -> ihp120

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53

Sep 22, 2013
09/13

by
B. Cessac

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The concept of Self-Organized Criticality (SOC) was proposed in an attempt to explain the widespread appearance of power-law in nature. It describes a mechanism in which a system reaches spontaneously a state where the characteristic events (avalanches) are distributed according to a power law. We present a dynamical systems approach to Self-Organized Criticality where the dynamics is described either in terms of Iterated Function Systems, or as a piecewise hyperbolic dynamical system of...

Source: http://arxiv.org/abs/nlin/0409004v1

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46

Jul 20, 2013
07/13

by
B. Cessac; J. A. Sepulchre

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We apply the linear response theory developed in \cite{Ruelle} to analyze how a periodic signal of weak amplitude, superimposed upon a chaotic background, is transmitted in a network of non linearly interacting units. We numerically compute the complex susceptibility and show the existence of specific poles (stable resonances) corresponding to the response to perturbations transverse to the attractor. Contrary to the poles of correlation functions they depend on the pair emitting/receiving...

Source: http://arxiv.org/abs/cond-mat/0406553v2

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40

Sep 20, 2013
09/13

by
B. Holdom

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A vacuum instability due to a massless ghost in a hidden sector can lead to an effective equation of state for dark energy that changes smoothly from $w=-3/2$ at large redshifts, to $w\approx-1.2$ today, to $w=-1$ in the future. We discuss how this ghost can be the Goldstone boson of Lorentz symmetry breaking, and we find that this breaking in the hidden sector should occur at a scale below $\sim$10 KeV. The normal particles that are produced along with the ghosts are then predominantly...

Source: http://arxiv.org/abs/hep-th/0404109v2

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58

Sep 21, 2013
09/13

by
B. Lazarovits; B. Ujfalussy; L. Szunyogh; B. L. Gyorffy; P. Weinberger

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We present calculations for electronic and magnetic properties of surface states confined by a circular quantum corral built of magnetic adatoms (Fe) on a Cu(111) surface. We show the oscillations of charge and magnetization densities within the corral and the possibility of the appearance of spin--polarized states. In order to classify the peaks in the calculated density of states with orbital quantum numbers we analyzed the problem in terms of a simple quantum mechanical circular well model....

Source: http://arxiv.org/abs/cond-mat/0407435v2

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54

Sep 22, 2013
09/13

by
Barbara Drinovec Drnovsek

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We prove the following theorem: Let X be a Stein manifold of dimension at least 2 and Y a closed complete pluripolar subset of X. Given a point p in the complement of Y there is a proper holomorphic map f from the unit disc to X such that f(0)=p and the image of f avoids Y.

Source: http://arxiv.org/abs/math/0309377v2

51
51

Sep 22, 2013
09/13

by
Berthold-Georg Englert; Tin Kah Ming; Goh Choon Guan; Ng Hui Khoon

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We present a simple polarizing Mach-Zehnder interferometer that can be used for optimal minimal ellipsometry: Only four intensities are measured to determine the three Stokes parameters, and an optimal choice for the four polarization projections can be achieved for any sufficiently small wavelength range of interest.

Source: http://arxiv.org/abs/physics/0409015v1

7,674
7.7K

Sep 5, 2004
09/04

by
Bread and Roses

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01. Grass 02. Maybe Collecting Records Will Help 03. Boxing Day 1914 04. Dump the Bosses of Your Back 05. Making Punk A Threat Again, Again 06. The Wind and the Sea 07. Streets of Chinatown 08. Let my Last words not be in ryme

Topic: Live concert

Source: ADK A-51 S LE's > W-Mod Ua-5 > Optical S/Pdif > Nomad Jukebox 3

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43

Sep 22, 2013
09/13

by
Bruno Nachtergaele

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This article is a short introduction to the general topic of quantum spin systems. After a brief sketch of the history of the subject, the standard mathematical framework for formulating problems and results in quantum spin systems is described. Then, three short sections are devoted to Spontaneaous Symmetry Breaking, Phase transitions, and Dynamcis.

Source: http://arxiv.org/abs/math-ph/0409006v1

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49

Sep 21, 2013
09/13

by
C. S. Fischer; R. Alkofer; T. Dahm; P. Maris

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We investigate dynamical chiral symmetry breaking in unquenched ${QED}_3$ using the coupled set of Dyson--Schwinger equations for the fermion and photon propagators. For the fermion-photon interaction we employ an ansatz which satisfies its Ward--Green--Takahashi identity. We present self-consistent analytical solutions in the infrared as well as numerical results for all momenta. In Landau gauge, we find a phase transition at a critical number of flavours of $N_f^{\mathrm crit} \approx 4$. In...

Source: http://arxiv.org/abs/hep-ph/0407104v2

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34

Aug 26, 2021
08/21

by
Canvas

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documentaire over Hitlers relatie met vrouwen, over belangrijke vrouwen tijdens het Nazi-regime en de rol van de 'gewone' vrouw in deze periode.

Topics: Adolf Hitler, Geschiedenis, Het Derde Rijk, Vrouwen, Documentaire, Duitsland, Wereld Oorlog II,...

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20

Aug 27, 2021
08/21

by
Canvas

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The Battle of Arnhem was a battle of the Second World War at the vanguard of the Allied Operation Market Garden . It was fought in and around the Dutch towns of Arnhem, Oosterbeek, Wolfheze and Driel and the vicinity from 17 to 26 September 1944.

Topics: Arnhem, world war II, WWII, World War 2, WW2, History, documentary, operation market garden

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50

Sep 18, 2013
09/13

by
Carlos F. Sopuerta; Marco Bruni; Leonardo Gualtieri

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We introduce N-parameter perturbation theory as a new tool for the study of non-linear relativistic phenomena. The main ingredient in this formulation is the use of the Baker-Campbell-Hausdorff formula. The associated machinery allows us to prove the main results concerning the consistency of the scheme to any perturbative order. Gauge transformations and conditions for gauge invariance at any required order can then be derived from a generating exponential formula via a simple Taylor...

Source: http://arxiv.org/abs/gr-qc/0306027v3

This game, controlled by the arrow keys, is the first of a series of games focusing more on the yeti, instead of the penguin and his attempts at flight. The yeti surfs up and down a big wave, trying to pull off tricks and hit penguins out of the air. The wave gradually shrinks until the end of the game. If you press the Y ("motivation") key, when playing the game, an unseen penguin loudly yodels, which then echoes in the background. It was originally released in 2004 for Flash. Later,...

Topic: Flash

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53

Sep 20, 2013
09/13

by
Christopher P. Herzog

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The low energy gauge theory living on D-branes probing a del Pezzo singularity of a non-compact Calabi-Yau manifold is not unique. In fact there is a large equivalence class of such gauge theories related by Seiberg duality. As a step toward characterizing this class, we show that Seiberg duality can be defined consistently as an admissible mutation of a strongly exceptional collection of coherent sheaves.

Source: http://arxiv.org/abs/hep-th/0405118v3

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65

Sep 22, 2013
09/13

by
D. Porras; J. I. Cirac

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We show that the dynamics of phonons in a set of trapped ions interacting with lasers is described by a Bose-Hubbard model whose parameters can be externally adjusted. We investigate the possibility of observing several quantum many-body phenomena, including (quasi) Bose-Einstein condensation as well as a superfluid-Mott insulator quantum phase transition.

Source: http://arxiv.org/abs/quant-ph/0409015v1

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63

Sep 22, 2013
09/13

by
Dan Seabold; Stefan Waner; Steve Warner

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We describe a graph-theoretic syntax for self-referential formulas as well as a four-valued logic to include contradictory and independent formulas. We then explore the degree to which generalized truth tables can be realized in our theory, and go on to describe a model theory for sentential calculus, wherein models are allowed to include contradictions (such as the ``Liar'') and formulas that result from them as an integral part of their structure. This sets the groundwork for a sequel in...

Source: http://arxiv.org/abs/math/0409034v1

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31

Jul 27, 2020
07/20

by
Dave Lefkowitz

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Dave Lefkowitz chats with legendary folk musician Tom Paxton Topics include: folk music, Bob Dylan, Phil Ochs. Segment originally aired in two parts, Sept. 2, 2004 and Sept. 30, 2004, as part of the “Dave’s Gone By” radio program hosted by Dave Lefkowitz. Please Note: Segments extracted from “Dave’s Gone By” may have music and other elements removed for timing and media re-posting considerations. For the full interview with all elements, please visit the audio of the complete...

Topics: Bob Dylan, Broadway, comedy, Dave Lefkowitz, Daves Gone By, David Lefkowitz, folk, funny, humor,...

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Jul 27, 2020
07/20

by
Dave Lefkowitz

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Here is the 92nd episode of the long-running radio show/podcast, Dave’s Gone By, which aired on NY’s WGBB-AM radio, Sept. 2, 2004. More info: davesgoneby.com. host: Dave Lefkowitz guest: singer-songwriter Tom Paxton (part one of two). Featuring: Part one (of two) of Dave’s chat with folk-music legend, Tom Paxton. Plus: Inside Broadway (Aida, Oz & Snow) 00:00:01 DAVE GOES IN 00:14:00 INSIDE BROADWAY – Aida & Oz Out, Slava In 00:10:00 DAVE’S GOT GUESTS – Tom...

Topics: Aida, Broadway, comedy, Dave Lefkowitz, David Lefkowitz, folk, folk music, funny, music, New York,...

43
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Sep 22, 2013
09/13

by
David H. Adams

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In [Phys.Rev.Lett.92:162002 (2004), hep-lat/0312025] expressions for the continuous Euclidean time limits of various lattice fermion determinants were derived and compared in order to test universality expectations in Lattice QCD. Here we review that work with emphasis on its relevance for assessing the fractional power prescription for the determinant in dynamical staggered fermion simulations. Some new supplementary material is presented; in particular the status of the "universality...

Source: http://arxiv.org/abs/hep-lat/0409013v1

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Sep 23, 2013
09/13

by
David Hernandez

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In this paper we study general quantum affinizations $\U_q(\hat{\Glie})$ of symmetrizable quantum Kac-Moody algebras and we develop their representation theory. We prove a triangular decomposition and we give a classication of (type 1) highest weight simple integrable representations analog to Drinfel'd-Chari-Pressley one. A generalization of the q-characters morphism, introduced by Frenkel-Reshetikhin for quantum affine algebras, appears to be a powerful tool for this investigation. For a...

Source: http://arxiv.org/abs/math/0312336v3

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Sep 22, 2013
09/13

by
David Kutasov; Adam Schwimmer

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In hep-th/0312098 it was argued that by extending the ``$a$-maximization'' of hep-th/0304128 away from fixed points of the renormalization group, one can compute the anomalous dimensions of chiral superfields along the flow, and obtain a better understanding of the irreversibility of RG flow in four dimensional supersymmetric field theory. According to this proposal, the role of the running couplings is played by certain Lagrange multipliers that are introduced in the construction. We show that...

Source: http://arxiv.org/abs/hep-th/0409029v1

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Sep 22, 2013
09/13

by
Davor Krajnovic; Walter Jaffe

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We present observations of four nearby early-type galaxies with previously known nuclear stellar disks using two instruments on-board the Hubble Space Telescope. We observed NGC4128, NGC4612, and NGC5308 with the Wide Field Planetary Camera 2, and the same three galaxies, plus NGC4570, with the Space Telescope Imaging Spectrograph. We have detected a red nucleus in NGC4128, a blue nucleus in NGC4621, and a blue disk in NGC5308. Additionally, we have discovered a blue disk-like feature with...

Source: http://arxiv.org/abs/astro-ph/0409061v1

Amid political instability and violence, Iraq's economic problems have been viewed as secondary and unrelated. They are not. U.S. and Iraqi institutions have systematically lost and the insurgency gained momentum as living conditions failed to improve. Economic hardship and violence (political and criminal) feed on each other: heightened popular dissatisfaction and unemployment swell insurgent ranks and the growing insurgency further hampers development. Without genuine reconstruction and a...

Topics: DTIC Archive, COUNCIL ON FOREIGN RELATIONS NEW YORK, *WARFARE, *IRAQ, *POLITICAL SCIENCE,...

The objective of this research was to develop a microelectromechanical system (MEMS) atomizer which could produce small (less than 50 micron) droplets in order to improve gas turbine flameholding and reduce emissions.

Topics: DTIC Archive, Nabity, James, TDA RESEARCH INC WHEAT RIDGE CO, *FUEL INJECTORS, *ATOMIZATION,...

This paper summarizes and compares the results of systematic research programs at two independent laboratories regarding the injection of cryogenic liquids at subcritical and supercritical pressures, with application to liquid rocket engines. Both single jets and coaxial jets have been studied. Cold flow studies provided valuable information without introducing the complexities of combustion. Initial studies utilized a single jet of cryogenic nitrogen injected into a quiescent room temperature...

Topics: DTIC Archive, Oschwald, M, GERMAN AEROSPACE CENTER LAMPOLDSHAUSEN (GERMANY), *COMBUSTION, *LIQUID...

The Simulating Waves Nearshore (SWAN) wave model represents a significant improvement for the U.S. Navy s nearshore wave modeling capability. SWAN is a full-plane model allowing wave propagation from any direction. Features include variable boundary conditions, multiple coordinate system options, refraction, wave-current interaction, nesting, and numerous output options. The OpenMP version of SWAN allows the model to be run on multiple processors on shared memory platforms, greatly reducing run...

Topics: DTIC Archive, Allard, Richard, NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV,...

This TOP outlines the procedures for conducting sand and dust tests for vehicle mounted automatic weapons systems up to 4Omm.

Topics: DTIC Archive, YUMA PROVING GROUND AZ, *WEAPON SYSTEMS, *AUTOMATIC WEAPONS,...