1,713 research outputs found
Low energy spin fluctuations in the heavy fermion compound CeLaRuSi
We report inelastic neutron scattering measurements performed on a single
crystal of the heavy fermion compound CeLaRuSi,
which is at the borderline between an antiferromagnetically ordered and a
paramagnetic ground state. Intensity maps as a function of wavevector and
energy ( meV) were obtained at temperatures and 2 K, using
the time-of-flight spectrometer IRIS. An unexpected saturation of the
relaxation rate and static susceptibility of the spin fluctuations is found at
low temperatures.Comment: 2 pages, 2 figures, SCES'04 Proceeding
Optical Imaging and Spectroscopic Observation of the Galactic Supernova Remnant G85.9-0.6
Optical CCD imaging with H and [SII] filters and spectroscopic
observations of the galactic supernova remnant G85.9-0.6 have been performed
for the first time. The CCD image data are taken with the 1.5m Russian-Turkish
Telescope (RTT150) at TUBITAK National Observatory (TUG) and spectral data are
taken with the Bok 2.3 m telescope on Kitt Peak, AZ.
The images are taken with narrow-band interference filters H, [SII]
and their continuum. [SII]/H ratio image is performed. The ratio
obtained from [SII]/H is found to be 0.42, indicating that the
remnant interacts with HII regions. G85.9-0.6 shows diffuse-shell morphology.
[SII] average flux ratio is calculated from the
spectra, and the electron density is obtained to be 395 . From
[OIII]/H ratio, shock velocity has been estimated, pre-shock density of
, explosion energy of ergs,
interstellar extinction of , and neutral hydrogen column density
of are reported.Comment: 20 pages, 4 tables, 4 figures. Accepted for publication in
Astrophysics & Space Scienc
Recommended from our members
Direct-Write Fabrication of Integrated, Multilayer Ceramic Components
The need for advanced (electronic) ceramic components with smaller size, greater
functionality, and enhanced reliability requires the ability to integrate electronic ceramics in
complex 3-D architectures. For rapid prototyping and small-lot manufacturing, traditional tape
casting and screen printing approaches are poorly suited. To address this need, we are developing
a direct-write approach for fabricating highly integrated, multilayer components using a
micropen to deposit slurries in precise patterns. With this technique, components can be
constructed layer by layer, simplifying fabrication. It can also be used to produce structures
combining several materials in a single layer. The parts are either cofired or sequentially fired,
after each layer is deposited. Since differential shrinkage can lead to defects in these multilayer
structures, we are characterizing the sintering behavior ofindividua1layers. This technique has
been used to fabricate devices such integrated RC filters, multilayer voltage transformers, and
other passive components. The direct-write approach provides the ability to fabricate
multifunctional, multimaterial integrated ceramic components (MMICCs) in an agile and rapid
way.Mechanical Engineerin
Servicio de genética para personas con discapacidad intelectual y sus familias
En este artículo se revisan los avances de los últimos años en genética molecular y se discute el impacto que pueden tener sobre las personas con discapacidad intelectual y sus familias. El objetivo no es presentar un amplio tratado científico sino más bien utilizar ejemplos de la genética para señalar nuestra opinión actual e indicar áreas de incertidumbre e información errónea. A medida que aumenta con el tiempo nuestro conocimiento y comprensión sobre las bases genéticas de las enfermedades, pueden producirse beneficios significativos para algunas familias, pero el potencial de discriminación hacia los individuos por cuestiones genéticas también se incrementará
Galaxies in box: A simulated view of the interstellar medium
We review progress in the development of physically realistic three
dimensional simulated models of the galaxy.We consider the scales from star
forming molecular clouds to the full spiral disc. Models are computed using
hydrodynamic (HD) or magnetohydrodynamic (MHD) equations and may include cosmic
ray or tracer particles. The range of dynamical scales between the full galaxy
structure and the turbulent scales of supernova (SN) explosions and even cloud
collapse to form stars, make it impossible with current computing tools and
resources to resolve all of these in one model. We therefore consider a
hierarchy of models and how they can be related to enhance our understanding of
the complete galaxy.Comment: Chapter in Large Scale Magnetic Fields in the Univers
Controlling laser spectra in a phaseonium photonic crystal using maser
We study the control of quantum resonances in photonic crystals with
electromagnetically induced transparency driven by microwave field. In addition
to the control laser, the intensity and phase of the maser can alter the
transmission and reflection spectra in interesting ways, producing hyperfine
resonances through the combined effects of multiple scattering in the
superstructure.Comment: 7 pages, 4 figure
Robust Entanglement in Atomic Systems via Lambda-Type Processes
It is shown that the system of two three-level atoms in
configuration in a cavity can evolve to a long-lived maximum entangled state if
the Stokes photons vanish from the cavity by means of either leakage or
damping. The difference in evolution picture corresponding to the general model
and effective model with two-photon process in two-level system is discussed.Comment: 10 pages, 3 figure
The bass and topological stable ranks of the Bohl algebra are infinite
The Bohl algebra B is the ring of linear combinations of functions t k e λt on the real line, where k is any nonnegative integer, and λ is any complex number, with pointwise operations. We show that the Bass stable rank and the topological stable rank of B (where we use the topology of uniform convergence) are infinite
- …