Infrared radiation measurements of combustion gases Seventh quarterly progress report, 1 Jan. - 31 Mar. 1966

Infrared spectrometer system to obtain spectral absorption characteristics of combustion products under various thermodynamic and optical condition

Infrared radiation measurements of combustion gases Sixth quarterly progress report, 1 Oct. - 31 Dec. 1965

Modifications in apparatus for infrared radiation measurements of combustion gase

Infrared radiation measurements of combustion gases Fourth quarterly progress report, Apr. 1 - Jun. 30, 1965

Carbon dioxide fundamental absorption spectrum at 1500 deg Kelvi

Infrared radiation measurements of combustion gases third quarterly progress report, 1 jan. - 31 mar. 1965

Infrared absorption spectrum measurements of carbon monoxide - exhaust gase

Deconstruction and other approaches to supersymmetric lattice field theories

This report contains both a review of recent approaches to supersymmetric lattice field theories and some new results on the deconstruction approach. The essential reason for the complex phase problem of the fermion determinant is shown to be derivative interactions that are not present in the continuum. These irrelevant operators violate the self-conjugacy of the fermion action that is present in the continuum. It is explained why this complex phase problem does not disappear in the continuum limit. The fermion determinant suppression of various branches of the classical moduli space is explored, and found to be supportive of previous claims regarding the continuum limit.Comment: 70 page

The study of base heating by radiation from exhaust gases final report, oct. 1, 1963 - sep. 30, 1964

Base heating by radiation from exhaust gase

NIF Target Capsule Wall And Hohlraum Transfer Gas Effects On Deuterium-Tritium Redistribution Rates

The effects of temperature and age on the times required for beta-heating-induced redistribution of a 50-50 mole percent mixture of deuterium and tritium (DT) in a spherical capsule are investigated analytically and numerically. The derivation of an analytical solution for the redistribution time in a one-dimensional binary diffusion model, which includes the capsule thermal resistance, is first described. This result shows that the redistribution time for a high conductivity capsule wall is approximately doubled after 8 days of {sup 3}He formation. In contrast, with a low thermal conductivity capsule wall (e.g., polyimide), the redistribution time would increase by less than 10%. The substantial effect of the capsule wall resistance suggested that the resistance to heat transfer from the capsule through the surrounding transfer gas to the hohlraum wall would also influence the redistribution process. This was investigated with a spherical model, which was based on accounting for energy transfer by diffusion with a conduction heat transfer approximation. This made it possible to solve for the continuous temperature distribution throughout the capsule and surrounding gas. As with the capsule the redistribution times depended on the relative values of the thermal resistances of the vapor, the capsule, and the transfer gas. With increasing thermal resistance of the vapor (increased concentration of {sup 3}He) redistributions times for hydrocarbon capsules were significantly less than predicted by the one-dimensional model, which included the capsule wall resistance. In particular for low {sup 3}He concentrations the time constant was approximately 10% less than the minimum one-dimensional value of 27 minutes. Further analytical and experimental investigation focused on defining the relations between the thermal resistances under which the one-dimensional model analysis applies is recommended

Deconstruction, Lattice Supersymmetry, Anomalies and Branes

We study the realization of anomalous Ward identities in deconstructed (latticized) supersymmetric theories. In a deconstructed four-dimensional theory with N=2 supersymmetry, we show that the chiral symmetries only appear in the infrared and that the anomaly is reproduced in the usual framework of lattice perturbation theory with Wilson fermions. We then realize the theory on the world-volume of fractional D-branes on an orbifold. In this brane realization, we show how deconstructed theory anomalies can be computed via classical supergravity. Our methods and observations are more generally applicable to deconstructed/latticized supersymmetric theories in various dimensions.Comment: 1+27 pages, 2 figures, references adde

Strange quarks and lattice QCD

The last few years have seen a dramatic improvement in our knowledge of the strange form factors of the nucleon. With regard to the vector from factors the level of agreement between theory and experiment gives us considerable confidence in our ability to calculate with non-perturbative QCD. The calculation of the strange scalar form factor has moved significantly in the last two years, with the application of new techniques which yield values considerably smaller than believed for the past 20 years. These new values turn out to have important consequences for the detection of neutralinos, a favourite dark matter candidate. Finally, very recent lattice studies have resurrected interest in the famed H-dibaryon, with modern chiral extrapolation of lattice data suggesting that it may be only slightly unbound. We review some of the major sources of uncertainty in that chiral extrapolation.Comment: Invited talk at the Asia-Pacific few Body Conference, Seoul Kore

Supersymetry on the Noncommutative Lattice

Built upon the proposal of Kaplan et.al. [hep-lat/0206109], we construct noncommutative lattice gauge theory with manifest supersymmetry. We show that such theory is naturally implementable via orbifold conditions generalizing those used by Kaplan {\sl et.al.} We present the prescription in detail and illustrate it for noncommutative gauge theories latticized partially in two dimensions. We point out a deformation freedom in the defining theory by a complex-parameter, reminiscent of discrete torsion in string theory. We show that, in the continuum limit, the supersymmetry is enhanced only at a particular value of the deformation parameter, determined solely by the size of the noncommutativity.Comment: JHEP style, 1+22 pages, no figure, v2: two references added, v3: three more references adde