4,673 research outputs found
Alien Registration- Finley, Susan T. (Livermore Falls, Androscoggin County)
https://digitalmaine.com/alien_docs/27011/thumbnail.jp
Angle of attack system
The development of systems for measuring model pitch and roll attitude in the National Transonic Facility (NTF) is discussed. The effort is divided between two approaches: (1) an inertial measurement that is an extrapolation of existing technology into a cryogenic environment, and (2) an optical technique based on a holographic angle sensor
Data management and language enhancement for generalized set theory computer language for operation of large relational databases
This report covers the study of the relational database implementation in the NASCAD computer program system. The existing system is used primarily for computer aided design. Attention is also directed to a hidden-surface algorithm for final drawing output
Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
We optically probe and electrically control a single artificial molecule
containing a well defined number of electrons. Charge and spin dependent
inter-dot quantum couplings are probed optically by adding a single
electron-hole pair and detecting the emission from negatively charged exciton
states. Coulomb and Pauli blockade effects are directly observed and
hybridization and electrostatic charging energies are independently measured.
The inter-dot quantum coupling is confirmed to be mediated predominantly by
electron tunneling. Our results are in excellent accord with calculations that
provide a complete picture of negative excitons and few electron states in
quantum dot molecules.Comment: shortened version: 6 pages, 3 figures, 1 table, to appear in Phys.
Rev. Let
Evidence for the Galactic X-ray Bulge II
A mosaic of 5 \ros~PSPC pointed observations in the Galactic plane
() reveals X-ray shadows in the keV band cast by
distant molecular clouds. The observed on-cloud and off-cloud X-ray fluxes
indicate that % and % of the diffuse X-ray background in this
direction in the \tq~keV and 1.5 keV bands, respectively, originates behind the
molecular gas which is located at 3 kpc from the Sun. The implication of
the derived background X-ray flux beyond the absorbing molecular cloud is
consistent with, and lends further support to recent observations of a Galactic
X-ray bulge.Comment: 19 pages, 5 figures, 2 table
BeppoSAX observations of the three Gamma-ray pulsars PSR B0656+14, PSR B1055-52 and PSR B1706-44
We report the results of the observations of the three gamma-ray pulsars PSR
B0656+14, PSR B1055-52 and PSR B1706-44 performed with BeppoSAX. We detected a
pulsed emission only for PSR B1055-52: in the range 0.1-6.5 keV the pulse
profile is sinusoidal and the statistical significance is 4.5 sigma. The pulsed
fraction was estimated 0.64+/-0.17. This pulsation was detected also at
energies greater than 2.5 keV suggesting either a non-thermal origin or a quite
high temperature region on the neutron star surface. Spectral analysis showed
that only the X-ray spectrum of PSR B1706-44 can be fitted by a single
power-law component, while that of PSR B1055-52 requires also a blackbody
component (kT = 0.075 keV) and that of PSR B0656+14 two blackbody components
(kT_1 = 0.059, kT_2 = 0.12 keV).Comment: 8 pages, 5 figures. Accepted for publication in A&
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