5,682 research outputs found
Monostable circuit with tunnel diode has fast recovery
A monostable multivibrator circuit using a tunnel diode makes it possible for the MSMV to exceed the performance of present multivibrators in two respects. The rise time of the output voltage is faster and the duty cycle is raised to approximately 95 percent
MS-114: Elizabeth Peeling Lyon Collection
This collection consists primarily of 75 letters Betty wrote to her family during her two years at Gettysburg College. They date from September 18, 1950 through May 19, 1952, excluding the summer holiday. The letters chronicle Betty’s college activities, showing specifically her participation in band, choir, the Independent Women, Kappa Delta Rho (her brother’s fraternity), and dorm life. This collection also contains one scrapbook sheet of four photographs taken on campus and Lyon’s freshman name sign.
Special Collections and College Archives Finding Aids are discovery tools used to describe and provide access to our holdings. Finding aids include historical and biographical information about each collection in addition to inventories of their content. More information about our collections can be found on our website http://www.gettysburg.edu/special_collections/collections/.https://cupola.gettysburg.edu/findingaidsall/1103/thumbnail.jp
Electron beam recorder image correction for ERTS
Video data from the Earth Resources Technology Satellite (ERTS) are entered into the initial image generation system and placed on film using an electron beam to correct for both radiometric and geometric errors, a hardware unit called EBRIC was designed, fabricated, and incorporated in the image processing system. It operates under the control of a process control computer, as it varies video signal and the x and y deflection signals of the EBR
Radio frequency noise emission from orbiting protons
Galactic radio frequency noise emission from protons orbiting around charged intergalactic dust particle
Hamiltonian Approach to QCD: The effective potential of the Polyakov loop
The effective potential of the order parameter for confinement is calculated
within the Hamiltonian approach to Yang--Mills theory. Compactifying one
spatial dimension and using a background gauge fixing this potential is
obtained by minimizing the energy density for a given background field. Using
Gaussian type trial wave functionals I establish an analytic relation between
the propagators in the background gauge at finite temperature and the
corresponding zero temperature propagators in Coulomb gauge. In the simplest
truncation, neglecting the ghost and using the ultraviolet form of the gluon
energy one recovers the Weiss potential. From the fully non-perturbative
potential (with the ghost included) one extracts a critical temperature of the
deconfinement phase transition of 270 MeV for the gauge group SU(2).Comment: 8 pages, 6 eps figures. Talk given by Hugo Reinhardt at Xth Quark
Confinement and the Hadron Spectrum, October 8--12, 2012 TUM Campus Garching,
Munich, German
The effective potential of the confinement order parameter in the Hamiltonian approach
The effective potential of the order parameter for confinement is calculated
for SU(N) Yang--Mills theory in the Hamiltonian approach. Compactifying one
spatial dimension and using a background gauge fixing, this potential is
obtained within a variational approach by minimizing the energy density for
given background field. In this formulation the inverse length of the
compactified dimension represents the temperature. Using Gaussian trial wave
functionals we establish an analytic relation between the propagators in the
background gauge at finite temperature and the corresponding zero-temperature
propagators in Coulomb gauge. In the simplest truncation, neglecting the ghost
and using the ultraviolet form of the gluon energy, we recover the Weiss
potential. We explicitly show that the omission of the ghost drastically
increases the transition temperature. From the full non-perturbative potential
(with the ghost included) we extract a critical temperature of the
deconfinement phase transition of 269 MeV for the gauge group SU(2) and 283 MeV
for SU(3).Comment: 26 pages, 17 eps figure
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