65,547 research outputs found
Optical phonons in new ordered perovskite Sr2Cu(Re0.69Ca0.31) Oy system observed by infrared reflectance spectroscopy
We report infrared reflectivity spectra for a new correlated cupric oxide
system Sr2Cu(Re0.69Ca0.31)Oy with y ~ 0.6 at several temperatures ranging
between 8 and 380 K. The reflectivity spectrum at 300 K comprises of several
optical phonons. A couple of residual bands located around 315 and 653 cm-1
exhibit exceptionally large intensity as compared to the other ones. The
overall reflectivity spectrum lifts up slightly with increasing temperature.
The energy and damping factor of transverse-optical phonons are determined by
fitting the imaginary dielectric constant by Lorentz oscillator model and
discussed as a function of temperature in terms of lattice anharmonicity.Comment: 9 pages, 3 figures, presented at ISS2005, to appear in Physica
Tests for covariance matrices, particularly for high dimensional data
Test statistics for sphericity and identity of the covariance matrix are presented, when the data are multivariate normal and the dimension, p, can be larger than the sample size, n. The statistics, derived under very general conditions, follow an approximate normal distribution for large p, also when p >> n. Simulation results, particularly emphasizing the case when p can be much larger than n, show that the proposed statistics are accurate for both size control and power. A discussion of the commonly used assumptions for high dimensional set up is also given, with the conclusions applicable in general as well as in the special case of high dimensional covariance testing
A Closer Look at the Elementary Fermions
Although there have been many experimental and theoretical efforts to measure
and interpret small deviations from the standard model of particle physics, the
gap that the model leaves in understanding why there are only three generations
of elementary fermions, with hierarchical masses, has not received the
attention it deserves. I present here an attempt to fill this gap. Although our
findings are mostly only qualitative, they nevertheless may be of heuristic
value. Rules concerning the elementary fermions, some previously known and some
new, lead to a number of conclusions and questions that seem worth pursuing.
Some clarify the standard model, and others suggest possible modifications, the
implications of which are discussed.Comment: 8 page
The Creation in Building Good News for The Society in Medan, Indonesia
the news has three news coverage techniques, namely reportage, interviews, library
research (literature studies). Some news writing techniques that can be a basic guide for
journalists are:The title of the news is as concise as possible with short and clear sentences,
but can still describe the core of the story as a whole.There are 5W + 1H elements.Arrange
news so that it can be presented with accurate, clear and interesting information. Use
language that is easily understood by readers from a variety of circles.Not "patronizing" but
"showing / presenting"
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