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250069 documents, page 1 of 25007

Magnetocentrifugal Launching of Jets from Accretion Disks. I. Cold Axisymmetric Flows

Krasnopolsky, Ruben; Li, Zhi-Yun; Blandford, Roger (1999)
We present time-dependent, numerical simulations of the magnetocentrifugal model for jet formation, in an axisymmetric geometry, using a modification of the ZEUS3D code adapted to parallel computers. The gas is supposed cold with negligible thermal pressure throughout. The number of boundary conditions imposed on the disk surface is that necessary and sufficient to take into account information propagating upstream from the fast and Alfvén critical surfaces, avoiding overdetermination of the ...

A Conceptual Framework for Predictability Studies

Schneider, Tapio; Griffies, Stephen M. (1999)
A conceptual framework is presented for a unified treatment of issues arising in a variety of predictability studies. The predictive power (PP), a predictability measure based on information–theoretical principles, lies at the center of this framework. The PP is invariant under linear coordinate transformations and applies to multivariate predictions irrespective of assumptions about the probability distribution of prediction errors. For univariate Gaussian predictions, the PP reduces to conv...

Neutron Irradiation Tests of Pressure Transducers in Liquid Helium

Amand, J F; Bager, T; Casas-Cubillos, J; Thermeau, J P (1999)
The superconducting magnets of the future Large Hadron Collider (LHC) at CERN will operate in pressurised superfluid helium (1 bar, 1.9 K). About 500 pressure transducers will be placed in the liquid helium bath for monitoring the filling and the pressure transients after resistive transitions. Their precision must remain better than 100 mbar at pressures below 2 bar and better than 5% for higher pressures (up to 20 bar), with temperatures ranging from 1.8 K to 300 K. All the tested transduce...

Optimization of operation and test of large size GEM detectors

Bachmann, S; Bressan, A; Placci, Alfredo; Ropelewski, Leszek; Sauli, Fabio (1999)
We describe basic development work aimed at the realization of large (~1000 cm2 active) detectors for the COMPASS experiment, based on the gas electron multiplier technology. Essentially a high-rate forward spectrometer, the experiment requires high accuracy tracking of scattered particles and light detectors, in order not to degrade mass resolution and particle identification. The choice of a double GEM structure with two-coordinate read-out fulfils the above requirements. Systematic studies...

A model of learning task-specific knowledge for a new task

Taatgen, Niels A. (1999)
In this paper I will present a detailed ACT-R model of how the task-specific knowledge for a new, complex task is learned. The model is capable of acquiring its knowledge through experience, using a declarative representation that is gradually compiled into a procedural representation. The model exhibits several characteristics that concur with Fitt’s theory of skill learning, and can be used to show that individual differences in working memory capacity initially have a large impact on perfo...

Modeling the evolution of communication: From stimulus associations to grounded symbolic associations

Cangelosi, Angelo (1999)
This paper describes a model for the evolution of communication systems using simple syntactic rules, such as word combinations. It also focuses on the distinction between simple word-object associations and symbolic relationships. The simulation method combines the use of neural networks and genetic algorithms. The behavioral task is influenced by Savage-Rumbaugh & Rumbaugh’s (1978) ape language experiments. The results show that languages that use combination of words (e.g. “verb-object” ru...

Coulomb dissociation of 19C

Banerjee, P. (1999)
We aim to re-investigate the structure of the neutron rich exotic nucleus ^{19}C through studies of its Coulomb breakup reactions, assuming that its excitation is to states in the low energy continuum. The method used retains all finite-range effects associated with the interactions between the breakup fragments and can use realistic wave functions for this possibly halo nucleus. We apply the method to compute the longitudinal momentum distribution of ^{18}C, exclusive neutron angular distrib...

Optical and Radio Observations of the Afterglow from GRB 990510: Evidence for a Jet

Harrison, F. A.; Bloom, J. S.; Frail, D. A.; Sari, P.; Kulkarni, S. R.; Djorgovski, S. G.; Axelrod, T.; Mould, J.; Schmidt, B. P.; Wieringa, M. H.; Wark, R. M.; Subrahmanyan, R.; McConnell, D.; McCarthy, P. J.; Schaefer, B. E.;... (1999)
We present multicolor optical and two-frequency radio observations of the bright BeppoSAX event GRB 990510. Neither the well-sampled optical decay nor the radio observations are consistent with simple spherical afterglow models. The achromatic steepening in the optical band and the early decay of the radio afterglow, which both occur at t ~ 1 day, are evidence for hydrodynamical evolution of the source and can be most easily interpreted by models in which the gamma-ray burst ejecta are collim...

Characterization of the Interaction between the Herpes Simplex Virus Type I Fc Receptor and Immunoglobulin G

Chapman, Tara L.; You, Il; Joseph, Ian M.; Bjorkman, Pamela J.; Morrison, Sherie L.; Raghavan, Malini (1999)
Herpes simplex virus type I (HSV-1) virions and HSV-1-infected cells bind to human immunoglobulin G (hIgG) via its Fc region. A complex of two surface glycoproteins encoded by HSV-1, gE and gI, is responsible for Fc binding. We have co-expressed soluble truncated forms of gE and gI in Chinese hamster ovary cells. Soluble gE-gI complexes can be purified from transfected cell supernatants using a purification scheme that is based upon the Fc receptor function of gE-gI. Using gel filtration and ...