629 research outputs found
Rocket exhaust plume computer program improvement. Volume 1: Summary: Method of characteristics nozzle and plume programs
A summary is presented of the various documents that discuss and describe the computer programs and analysis techniques which are available for rocket nozzle and exhaust plume calculations. The basic method of characteristics program is discussed, along with such auxiliary programs as the plume impingement program, the plot program and the thermochemical properties program
Iconic memory of icon?
The objectives of the present commentary are to show that (1) one important theoretical property of iconic memory is inconsistent with a retinotopic icon, (2) data difficult for the notion of an icon do not necessarily challenge the notion of an iconic store, (3) the iconic store, as a theoretical mechanism, is an ecologically valid one, and (4) the rationale of experimentation is such that the experimental task need not mimic the phenomenon being studied
Erbium dopants in silicon nanophotonic waveguides
The combination of established nanofabrication with attractive material
properties makes silicon a promising material for quantum technologies, where
implanted dopants serve as qubits with high density and excellent coherence
even at elevated temperatures. In order to connect and control these qubits,
interfacing them with light in nanophotonic waveguides offers unique promise.
Here, we present resonant spectroscopy of implanted erbium dopants in such
waveguides. We overcome the requirement of high doping and above-bandgap
excitation that limited earlier studies. We thus observe erbium incorporation
at well-defined lattice sites with a thousandfold reduced inhomogeneous
broadening of about 1 GHz and a spectral diffusion linewidth down to 45 MHz.
Our study thus introduces a novel materials platform for the implementation of
on-chip quantum memories, microwave-to-optical conversion, and distributed
quantum information processing, with the unique feature of operation in the
main wavelength band of fiber-optic communication.Comment: 7 pages, 4 figure
A Chart-Parsing Algorithm for Efficient Semantic Analysis
In some contexts, well-formed natural language cannot be expected as input to
information or communication systems. In these contexts, the use of
grammar-independent input (sequences of uninflected semantic units like e.g.
language-independent icons) can be an answer to the users' needs. A semantic
analysis can be performed, based on lexical semantic knowledge: it is
equivalent to a dependency analysis with no syntactic or morphological clues.
However, this requires that an intelligent system should be able to interpret
this input with reasonable accuracy and in reasonable time. Here we propose a
method allowing a purely semantic-based analysis of sequences of semantic
units. It uses an algorithm inspired by the idea of ``chart parsing'' known in
Natural Language Processing, which stores intermediate parsing results in order
to bring the calculation time down. In comparison with using declarative logic
programming - where the calculation time, left to a prolog engine, is
hyperexponential -, this method brings the calculation time down to a
polynomial time, where the order depends on the valency of the predicates.Comment: 7 pages, 1 figure, LaTeX 2e using COLACL and EPSF packages.
Proceedings of the 19th International Conference on Computational Linguistics
(COLING 2002), Taipei, Republic of China (Taiwan), 24 Aug. - 1 Sept. 200
Inducing a Semantically Annotated Lexicon via EM-Based Clustering
We present a technique for automatic induction of slot annotations for
subcategorization frames, based on induction of hidden classes in the EM
framework of statistical estimation. The models are empirically evalutated by a
general decision test. Induction of slot labeling for subcategorization frames
is accomplished by a further application of EM, and applied experimentally on
frame observations derived from parsing large corpora. We outline an
interpretation of the learned representations as theoretical-linguistic
decompositional lexical entries.Comment: 8 pages, uses colacl.sty. Proceedings of the 37th Annual Meeting of
the ACL, 199
Chemically Reacting One-Dimensional Gas-Particle Flows
The governing equations for the one-dimensional flow of a gas-particle system are discussed. Gas-particle effects are coupled via the system momentum and energy equations with the gas assumed to be chemically frozen or in chemical equilibrium. A computer code for calculating the one-dimensional flow of a gas-particle system is discussed and a user's input guide presented. The computer code provides for the expansion of the gas-particle system from a specified starting velocity and nozzle inlet geometry. Though general in nature, the final output of the code is a startline for initiating the solution of a supersonic gas-particle system in rocket nozzles. The startline includes gasdynamic data defining gaseous startline points from the nozzle centerline to the nozzle wall and particle properties at points along the gaseous startline
Iowa Department of Corrections Annual Performance Report, FY2006
Agency Performance Repor
Solution of systems of nonlinear equations Final report
Algorithm and computer program of diagonal discrimination method for computing nonlinear and transcendental function
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