73,487 research outputs found
Evaluation of battery models for prediction of electric vehicle range
Three analytical models for predicting electric vehicle battery output and the corresponding electric vehicle range for various driving cycles were evaluated. The models were used to predict output and range, and then compared with experimentally determined values determined by laboratory tests on batteries using discharge cycles identical to those encountered by an actual electric vehicle while on SAE cycles. Results indicate that the modified Hoxie model gave the best predictions with an accuracy of about 97 to 98% in the best cases and 86% in the worst case. A computer program was written to perform the lengthy iterative calculations required. The program and hardware used to automatically discharge the battery are described
Electron observations between the inner edge of the plasma sheet and the plasmasphere
Electron energy density between inner edge of plasma sheet and plasmasphere measured by OGO-3 electrostatic analyze
Segmentation ART: A Neural Network for Word Recognition from Continuous Speech
The Segmentation ATIT (Adaptive Resonance Theory) network for word recognition from a continuous speech stream is introduced. An input sequeuce represents phonemes detected at a preproccesing stage. Segmentation ATIT is trained rapidly, and uses a fast-learning fuzzy ART modules, top-down expectation, and a spatial representation of temporal order. The network performs on-line identification of word boundaries, correcting an initial hypothesis if subsequent phonemes are incompatible with a previous partition. Simulations show that the system's segmentation perfonnance is comparable to that of TRACE, and the ability to segment a number of difficult phrases is also demonstrated.National Science Foundation (NSF-IRI-94-01659); Office of Naval Research (N00014-95-1-0409, N00014-95-1-0G57
Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
We propose that unconventional superconductivity in hydrated sodium cobaltate
results from an interplay of electronic correlations and
electron-phonon interactions. On the basis of the model plus phonons we
found evidences for a) unconventional superconductivity, b) realistic values of
and c) the dome shape existing near . This picture is
obtained for close to the critical Coulomb repulsion which separates
the uniform Fermi liquid from CDW ordered phase.Comment: 4 pages, 3 figure
Application of Monte Carlo-based statistical significance determinations to the Beta Cephei stars V400 Car, V401 Car, V403 Car and V405 Car
We have used Lomb-Scargle periodogram analysis and Monte Carlo significance
tests to detect periodicities above the 3-sigma level in the Beta Cephei stars
V400 Car, V401 Car, V403 Car and V405 Car. These methods produce six previously
unreported periodicities in the expected frequency range of excited pulsations:
one in V400 Car, three in V401 Car, one in V403 Car and one in V405 Car. One of
these six frequencies is significant above the 4-sigma level. We provide
statistical significances for all of the periodicities found in these four
stars.Comment: 11 pages, 17 figure
Large temporal variations of energetic electron intensities at mid-latitudes in the outer radiation zone Progress report
Variations of electron flux density observations by Explorer 12 and 1
Wall jet analysis for circulation control aerodynamics. Part 2: Zonal modeling concepts for wall jet/potential flow coupling
Work currently in progress to update an existing transonic circulation control airfoil analysis method is described. Existing methods suffer from two dificiencies: the inability to predict the shock structure of the underexpanded supersonic jets; and the insensitivity of the calculation to small changes in the Coanda surface geometry. A method developed for the analysis of jet exhaust plumes in supersonic flow is being modified for the case of the underexpanded wall jet. In the subsonic case, the same wall jet model was modified to include the calculation of the normal pressure gradient. This model is currently being coupled with the transonic circulation control airfoil analysis
Nongassing NiCd battery cell
Method of constructing nickel cadmium batteries prevents excessive gas buildup and allows hermetic sealing of battery for increased service life and reduced maintenance cost
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