2,137 research outputs found
Calculation of the thermodynamic properties of a mixture of gases as a function of temperature and pressure
The evaluation of the thermodynamic properties of a gas mixture can be performed using a generalized correlation which makes use of the second virial coefficient. This coefficient is based on statistical mechanics and is a function of temperature and composition, but not of pressure. The method provides results accurate to within 3 percent for gases which are nonpolar or only slightly polar. When applied to highly polar gases, errors of 5 to 10 percent may result. For gases which associate, even larger errors are possible. The sequences of calculations can be routinely programmed for a digital computer. The thermodynamic properties of a mixture of neon, argon and ethane were calculated by such a program. The result will be used for the design of the gas replenishment system for the Energetic Gamma Ray Experiment Telescope
Vus and neutron beta decay
We discuss the effect of the recent change of by three standard
deviations on the standard model predictions for neutron beta decay
observables. We also discuss the effect the experimental error bars of have on such predictions. Refined precision tests of the standard model
will be made by a combined effort to improve measurements in neutron beta decay
and in strangeness-changing decays. By itself the former will yield very
precise measurements of and make also very precise predictions for
Effective operator contributions to the oblique parameters
We present a model and process independent study of the contributions from
non-Standard Model physics to the oblique parameters S, T and U. We show that
within an effective lagrangian parameterization the expressions for the oblique
parameters in terms of observables are consistent, while those in terms of the
vector-boson vacuum polarization tensors are ambiguous. We obtain the
constraints on the scale of new physics derived from current data on S, T and U
and note that deviations in U from its Standard Model value would favor a
scenario where the underlying physics does not decouple.Comment: 13 pages, RevTe
SAMPEX
The DSN (Deep Space Network) mission support requirements for SAMPEX are summarized. SAMPEX is the first mission of the GSFC Small Explorer Satellite program (SMEX). Its primary scientific objectives are to measure the elemental and isotopic composition of solar energetic particles, anomalous cosmic rays, and galactic cosmic rays over the energy range from approximately one to several hundred MeV per nucleon. The SAMPEX mission objectives are outlined and the DSN support requirements are defined through the presentation of tables and narratives describing the spacecraft flight profile; DSN support coverage; frequency assignments; support parameters for telemetry, command and support systems; and tracking support responsibility
Sea Contributions to Spin 1/2 Baryon Structure, Magnetic Moments, and Spin Distribution
We treat the baryon as a composite system made out of a \lq\lq core" of three
quarks (as in the standard quark model) surrounded by a \lq\lq sea" (of gluons
and -pairs) which is specified by its total quantum numbers like
flavor, spin and color. Specifically, we assume the sea to be a flavor octet
with spin 0 or 1 but no color. The general wavefunction for spin 1/2 baryons
with such a sea component is given. Application to the magnetic moments is
considered. Numerical analysis shows that a scalar (spin 0) sea with an
admixture of a vector (spin 1) sea can provide very good fits to the magnetic
moment data {\em using experimental errors}. Our best fit automatically gives
for neutron beta decay in agreement with data. This fit also gives
reasonable values for the spin distributions of the proton and neutron.Comment: 24 pages, REVTEX. References modifie
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