4,782 research outputs found
Raising and Lowering operators of spin-weighted spheroidal harmonics
In this paper we generalize the spin-raising and lowering operators of
spin-weighted spherical harmonics to linear-in- spin-weighted
spheroidal harmonics where is an additional parameter present in the
second order ordinary differential equation governing these harmonics. One can
then generalize these operators to higher powers in . Constructing
these operators required calculating the -, - and -raising and
lowering operators (and various combinations of them) of spin-weighted
spherical harmonics which have been calculated and shown explicitly in this
paper
Soil bacteria and phosphates
Cover title.Includes bibliographical references
Band structure of W and Mo by empirical pseudopotential method
The empirical pseudopotential method (EPM) is used to calculate the band structure of tungsten and molybdenum. Agreement between the calculated reflectivity, density of states, density of states at the Fermi surface and location of the Fermi surface from this study and experimental measurements and previous calculations is good. Also the charge distribution shows the proper topological distribution of charge for a bcc crystal
A computer program for a line-by-line calculation of spectra from diatomic molecules and atoms assuming a Voight line profile
Computer program predicts the spectra resulting from electronic transitions of diatomic molecules and atoms in local thermodynamic equilibrium. The program produces a spectrum by accounting for the contribution of each rotational and atomic line considered
Finding high-order analytic post-Newtonian parameters from a high-precision numerical self-force calculation
We present a novel analytic extraction of high-order post-Newtonian (pN)
parameters that govern quasi-circular binary systems. Coefficients in the pN
expansion of the energy of a binary system can be found from corresponding
coefficients in an extreme-mass-ratio inspiral (EMRI) computation of the change
in the redshift factor of a circular orbit at fixed angular
velocity. Remarkably, by computing this essentially gauge-invariant quantity to
accuracy greater than one part in , and by assuming that a subset of
pN coefficients are rational numbers or products of and a rational, we
obtain the exact analytic coefficients. We find the previously unexpected
result that the post-Newtonian expansion of (and of the change
in the angular velocity at fixed redshift factor) have
conservative terms at half-integral pN order beginning with a 5.5 pN term. This
implies the existence of a corresponding 5.5 pN term in the expansion of the
energy of a binary system.
Coefficients in the pN series that do not belong to the subset just described
are obtained to accuracy better than 1 part in at th pN
order. We work in a radiation gauge, finding the radiative part of the metric
perturbation from the gauge-invariant Weyl scalar via a Hertz
potential. We use mode-sum renormalization, and find high-order renormalization
coefficients by matching a series in to the large- behavior of
the expression for . The non-radiative parts of the perturbed metric
associated with changes in mass and angular momentum are calculated in the
Schwarzschild gauge
Ten plays for primary grades
Thesis (Ed.M.)--Boston Universit
The Use of Agricultural Credit Facilities by 50 Negro Farm Families in Austin County, Texas
This study is limited to Negro farmers living and operating farms in Austin County. In this report, a brief description of the natural and human resources of the county are given in order to establish a background of the area covered.
A description is also given of the established credit facilities in the county, both Government sponsored and private sources and their policies regarding credit to farm families.
The purpose for which the study was made was to determine the reasons why the farm population is on a steady decline, the cause for sub-standard housing, to determine where farmers obtain their capitol for their farm operations and the rate of interest charged by the various lending agencies. This study was also necessary in order that the writer can get a better knowledge of the farmers problems in relation to capitol and will aid in the planning of a program where some of the problems stated can be worked on
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