Results 181 to 190 of about 3,967 (197)

Comet — A new method for the deterministic test pattern generation in c-circuits

Microelectronics Reliability, 1994
Abstract An original method (COnvergency METhod, COMET) is presented for the deterministic test pattern generation in c-circuits (combinational logic circuits), which issues a completely new theoretic approach to the Automatic Test Pattern Generation (ATPG) problem. It defines a test pattern by a pair of appropriate subgraphs (CONtrollability Graphs,
Stavros P Dokouzyannis, John M Kontoleon
openaire   +1 more source

Generation of X-rays from Comet C/Hyakutake 1996 B2

Science, 1997
The instability resulting from the relative motion of newly picked-up cometary photoions and the solar wind generates lower hybrid waves that are capable of accelerating electrons to the keV range of energies. These electrons may be responsible for the x-rays from comet C/Hyakutake 1996 B2 seen by the Röntgen X-ray Satellite.
, Bingham, , Dawson, , Shapiro, , Mendis, , Kellett   +4 more
openaire   +2 more sources

The Correction of Myopia Evaluation Trial (COMET): design and general baseline characteristics.

Controlled clinical trials, 2001
The Correction of Myopia Evaluation Trial (COMET) is a multicenter, randomized, double-masked, controlled clinical trial evaluating whether there is a difference in the progression of myopia between children wearing progressive addition lenses (PALs) versus conventional single vision lenses (SVLs), as measured by cycloplegic autorefraction.
L, Hyman, J, Gwiazda, W L, Marsh-Tootle, T T, Norton, M, Hussein   +4 more
openaire   +2 more sources

X-rays from comets generated by energetic solar wind particles

Planetary and Space Science, 1998
Abstract By means of axisymmetric hydrodynamic models with chemistry we study the X-ray emission of two processes in a comet: Bremsstrahlung of solar wind electrons interacting with the neutral gas coma, and charge exchange of heavy solar wind ions in high ionization states with the neutral cometary gas.
R. Wegmann, H.U. Schmidt, C.M. Lisse, K. Dennerl, J. Englhauser   +4 more
openaire   +1 more source

Proto-metastatic core and comet effect: new theoretical model of the mechanism of metastasis generation

Medical Hypotheses, 2000
One important aspect of cancer is its capacity to generate metastasis. The mechanism by which one or several neoplastic cells escape from the primitive tumor to start the metastatic process is still a matter of discussion, hence the need to reconsider under which circumstances and conditions 'lethal escape' is produced.
J, Fiol, M G, Bolognese
openaire   +2 more sources

Upstream and downstream propagating waves generated by pickup ions near comet Halley

Journal of Geophysical Research: Space Physics, 1996
It is well known that most of the Alfvén waves generated in the solar wind by cometary ion pickup are propagating upstream in the solar wind reference frame. However, the magnitude of the small proportion propagating downstream is extremely important because it controls the amount of ion acceleration driven by the second order Fermi process.
A. D. Johnstone, I. Krauklis, D. E. Huddleston, A. Söding, K‐H. Glassmeier, F. M. Neubauer   +5 more
openaire   +1 more source

Pacer Comet 4: Next Generation Automated Testing of Gas Turbine Engines

2006 IEEE Autotestcon, 2006
This paper demonstrates the advantages and main design features of the Pacer Comet 4 system intended to test gas turbine engines for the United States Air Force. Building upon the existing test cell system and applying both technological advancements and lessons learned, Pacer Comet 4 will replace the aging Pacer Comet III (PC3) system which has served
Hallie Peltier, Michael Metzger
openaire   +1 more source

A major step in understanding the X-ray generation in comets: recent progress obtained with XMM-Newton

SPIE Proceedings, 2003
The observation of comet C/2000 WM1 (LINEAR) with XMM-Newton is a highlight in the field of cometary research. During 17 hours of almost uninterrupted observations, more than one million photons were recorded with unprecedented spectral resolution. The results obtained so far clearly demonstrate that the X-ray emission is caused by charge exchange ...
Dennerl, K., Aschenbach, B., Burwitz, V., Englhauser, J., Lisse, C., Rodriguez-Pascual, P.   +5 more
openaire   +2 more sources

Sungrazing comets as General Relativistic gravitational probes

The Sixteenth Marcel Grossmann Meeting, 2023
Silvia Pietroni, Costantino Sigismondi
openaire   +1 more source

Mars as a Comet: Local Generation of Mirror Modes by Pickup Protons

Mirror mode structures are born from a plasma instability driven by a large temperature anisotropy and appear downstream of planetary and interplanetary shocks, in their magnetosheath. As magnetic bottles imprisoning dense and hot plasma, they are usually observed downstream of their region of formation, where the anisotropy is large and free energy is
Cyril L. Simon Wedlund, Christian Xavier Mazelle, Karim Meziane, Cesar Bertucci, Martin Volwerk, Luis Preisser, Daniel Schmid, Jasper S. Halekas, James P. Mcfadden, David Mitchell, Jared Espley, Pierre Henri   +11 more
openaire   +1 more source