229 research outputs found
Development of magnetic logic batch fabrication techniques Final report
Magnetic logic batch fabrication technique
Method for making conductors for ferrite memory arrays
The ferrite memory arrays are made from pre-formed metal conductors for the ferrite arrays. The conductors are made by forming a thin sheet of a metallizing paste of metal alloy powder, drying the paste layer, bisque firing the dried sheet at a first temperature, and then punching the conductors from the fired sheet. During the bisque firing, the conductor sheet shrinks to 58 percent of its pre-fired volume and the alloy particles sinter together. The conductors are embedded in ferrite sheet material and finally fired at a second higher temperature during which firing the conductors shrink approximately the same degree as the ferrite material
Pcm telemtry- a new approach using all- magnetic techniques
Digital all-magnetic circuit technique used in pulse code modulation telemetry system
Research on reliable and radiation insensitive pulse-drive sources for all-magnetic logic systems final report
Pulsed generator electron tube and semiconductor device minimization and elimination - spacecraft application for all-magnetic logic syste
Feasibility breadboard of an all-magnetic PCM telemetry system
Feasibility breadboard of all magnetic PCM TELEMETRY syste
Batch fabrication process development for ferrite logic conductors
A process for fabricating ultrareliable magnetic ferrite logic circuits is described in which the conductors are formed by a combination of two batch type processes - photolithography and electroplating - and a mechanized writing process for completing conductors in the third dimension. Up to 4 turns, through an aperture 1 mm in diameter, are formed by the described process. The number of joints in the conductors is reduced by use of this process to only those which are required for input, output and power connections of a logic block. To demonstrate feasibility, 8-stage magnetic ring counter circuits have been fabricated
BRS Ourominas: nova cultivar de arroz irrigado para Mato Grosso do Sul.
bitstream/item/24863/1/COT200254.pdfDocumento on-line
All-magnetic PCM telemetry - A review of the system breadboard
Breadboard design and fabrication, analog channel commutation limits, and reliability studies in development of magnetic pulse code modulation telemetr
Primordial black holes under the double inflationary power spectrum
Recently, it has been shown that the primordial black holes (PBHs) produced
by near critical collapse in the expanding universe have a scaling mass
relation similar to that of black holes produced in asymptotically flat
spacetime. Distinct from PBHs formed with mass about the horizon mass (Type I),
the PBHs with the scaling relation (Type II) can be created with a range of
masses at a given formation time. In general, only the case in which the PBH
formation is concentrated at one epoch has been considered. However, it is
expected that PBH formation is possible over a broad range of epochs if the
density fluctuation has a rather large amplitude and smooth scale dependence.
In this paper, we study the PBH formation for both types assuming the power
spectrum of double inflationary models in which the small scale fluctuations
could have large amplitudes independent of the CMBR anisotropy. The mass
spectrum of Type II PBHs is newly constructed without limiting the PBH
formation period. The double inflationary power spectrum is assumed to be of
double simple power-law which are smoothly connected. Under the assumed power
spectrum, the accumulation of small PBHs formed at later times is important and
the mass range is significantly broadened for both Types. The PBH mass spectra
are far smoother than the observed MACHO spectrum due to our assumption of a
smooth spectrum. In order to fit the observation, a more spiky spectrum is
required.Comment: 7 pages including 2 figures, to be published in Phys. Rev.
Searching for stellar mass black holes in the solar neighborhood
We propose a strategy for searching for isolated stellar mass black holes in
the solar neighborhood with the Sloan Digital Sky Survey. Due to spherical
accretion of the inter-stellar medium and the ambient magnetic field, an
isolated black hole is expected to emit a blended, thermal synchrotron spectrum
with a roughly flat peak from the optical down to the far infra-red. We find
that the Sloan Survey will be able to detect isolated black holes, in the
considered mass range of 1--100, out to a few hundred parsecs,
depending on the local conditions of the ISM. We also find that the black holes
are photmetrically distinguishable from field stars and they have a photometry
similar to QSOs. They can be further singled out from QSO searches because they
have a featureless spectrum with no emission lines. The Sloan Survey will
likely find hundreds of objects that meet these criteria, and to further reduce
the number of candidates, we suggest other selection criteria such as infra-red
searches and proper motion measurements. Estimates indicate that dozens of
black holes may exist out to a few hundred parsecs. If no black hole candidates
are found in this survey, important limits can be placed on the local density
of black holes and the halo fraction in black holes, especially for masses
greater than about .Comment: Latex, 7 pages, 3 postscript figures, submitted to ApJ Letters. Also
available at http://fnas08.fnal.gov
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