7,012 research outputs found
Two-pion exchange NN potential from Lorentz-invariant EFT
We outline the progress made in the past five years by the S\~ao Paulo group
in the development of a two-pion exchange nucleon-nucleon potential within a
Lorentz-invariant framework of (baryon) chiral perturbation theory.Comment: 5 pages, Talk given at the 18th International IUPAP Conference on
Few-Body Problems in Physics, August 21-26 2006, Santos, Sao Paulo, Brazi
Electromagnetic interactions in Halo Effective Field Theory
After a brief discussion of effective field theory applied to nuclear
clusters, I concentrate on the inclusion of two particular aspects, namely,
narrow resonances and electromagnetic interactions. As examples of
applications, I present the details of our studies on alpha-alpha and
proton-alpha scattering.Comment: 11 pages, 5 figures, lead parallel talk given at the 19th Intl. IUPAP
Conf. on Few-Body Problems in Physics, Bonn, Germany, Aug.31-Sep.5 200
Nuclear clusters with Halo Effective Field Theory
After a brief discussion of effective field theory applied to nuclear
clusters, I present the aspect of Coulomb interactions, with applications to
low-energy alpha-alpha and nucleon-alpha scattering.Comment: 6 pages, 3 figures, plenary talk given at the Fourth Asia-Pacific
Conference on Few-Body Problems in Physics 2008, Depok, Indonesia, August 19
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Simplified heat engine
In Sterling-cycle heat engine, pneumatic system is used to drive displacer/regenerator, eliminating mechanical linkages and valves
Highly stable microwave delay line
TWM /Traveling Wave Master/ comb structure serves as a highly stable microwave delay line for determining the short-term stability of the hydrogen maser frequency standards used in the deep space network. Cryogenic cooling is used to minimize signal attenuation and thermal noise
Improved cryogenic refrigeration system
Two-position shuttle valve simplifies valving arrangement and crank-shaft configuration in gas-balancing and Stirling-cycle refrigeration systems used to produce temperatures below 173 degrees K. It connects the displacer and regenerator alternately to the supply line or the return line of the compressor, and establishes constant pressure on the drive piston
Refrigeration apparatus Patent
Method and apparatus for producing very low temperature refrigeration based on gas pressure balanc
Centrifugal-reciprocating compressor
A centrifugal compressor is described which includes at least one pair of cylinders arranged in coaxial alignment and supported for angular displacement about a common axis of rotation normally disecting a common longitudinal axis of symmetry for the cylinders. The cylinders are characterized by ported closures located at the mutually remote ends thereof through which the cylinders are charged and discharged, and a pair of piston heads seated within the cylinders and supported for floating displacement in compressive strokes in response to unidirectional angular displacement imparted to the cylinders
The superconducting cavity-stabilized maser oscillator
The possibility of integrating a superconducting cavity with a traveling wave maser is explored to obtain a frequency standard with very high spectral purity
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