746 research outputs found
E-GOVERNMENT ON LOCAL PUBLIC POLICY. THE SINALOA CASE
Information and Communication Technologies (ICTs) have signiicantlyimpacted the organization and function of democratic governmentsin the past two decades. In this article we discuss the magnitude ofchanges in the public administration of Sinaloa, Mexico for effects ofthe adoption of e-government in the 2011-2015 period; also we showthe uneven and arbitrary manner that has been put into operation dueto the inexperienced and improvisation that has become a feature oflocal governments in the country
CCD Photometry of the Globular Cluster NGC 5897
We report CCD photometric observations of the globular cluster NGC 5897, in
the Johnson system filters B, V , R, and I. With the values for these
magnitudes we obtain various colour indices and produce several
colour-magnitude diagrams. We present eight colour-magnitude diagrams: V vs B-V
, B vs B-V , V vs V-I, I vs V-I, R vs R-I, I vs R-I, V vs V-R, and R vs V-R. In
all of these diagrams we can clearly see the Giant Branch, the Horizontal
Branch and the beginning of the Main Sequence. To the left of the Main Sequence
turn-off point we detect a somewhat large number of Blue Straggler stars. We
determine the mean value of the visual magnitude of the HB as .
This value is fainter than the value found by other authors.Comment: 28 pages, 7 figures, accepted for publication RevMexAA, vol. 60-1,
April 2024. arXiv admin note: text overlap with arXiv:1606.0452
Quadratic Time-dependent Quantum Harmonic Oscillator
We present a Lie algebraic approach to a Hamiltonian class covering driven,
parametric quantum harmonic oscillators where the parameter set -- mass,
frequency, driving strength, and parametric pumping -- is time-dependent. Our
unitary-transformation-based approach provides a solution to the general
quadratic time-dependent quantum harmonic model. As an example, we show an
analytic solution to the periodically driven quantum harmonic oscillator
without the rotating wave approximation; it works for any given detuning and
coupling strength regime. For the sake of completeness, we provide an analytic
solution to the historical Caldirola--Kanai quantum harmonic oscillator that,
in a suitable reference frame, is just a time-independent parametric quantum
harmonic oscillator.Comment: 22 pages, 4 figure
A major star formation region in the receding tip of the stellar Galactic bar
We present an analysis of the optical spectroscopy of 58 stars in the
Galactic plane at \arcdeg, where a prominent excess in the flux
distribution and star counts have been observed in several spectral regions, in
particular in the Two Micron Galactic Survey (TMGS) catalog. The sources were
selected from the TMGS, to have a magnitude brighter than +5 mag and be
within 2 degrees of the Galactic plane. More than 60% of the spectra correspond
to stars of luminosity class I, and a significant proportion of the remainder
are very late giants which would also be fast evolving. This very high
concentration of young sources points to the existence of a major star
formation region in the Galactic plane, located just inside the assumed origin
of the Scutum spiral arm. Such regions can form due to the concentrations of
shocked gas where a galactic bar meets a spiral arm, as is observed at the ends
of the bars of face-on external galaxies. Thus, the presence of a massive star
formation region is very strong supporting evidence for the presence of a bar
in our Galaxy.Comment: 13 pages (latex) + 4 figures (eps), accepted in ApJ Let
Sub-arcsecond radio and optical observations of the likely counterpart to the gamma-ray source 2FGL J2056.7+4939
We have searched and reviewed all multi- wavelength data available for the
region towards the gamma-ray source 2FGL J2056.7+4939 in order to con- strain
its possible counterpart at lower energies. As a result, only a point-like
optical/infrared source with flat-spectrum radio emission is found to be
consistent with all X-ray and gamma-ray error circles. Its struc- ture is
marginally resolved at radio wavelengths at the sub-arcsecond level. An
extragalactic scenario appears to be the most likely interpretation for this
object.Comment: 5 pages, 3 figures, 1 tabl
Indurated Plaques on the Legs: Think Lymphoma
Primary cutaneous diffuse large B-cell lymphoma,
leg-type (PCDLBCL-LT) is a rare and aggressive
neoplasm. A timely diagnosis may prevent fatal outcomes;
physicians should take this entity into consideration
when assessing non-specific lesions on
the lower limbs. We present a 69-year-old woman
with a 1-month history of a firm plaque on her left
leg. Physical examination revealed an asymptomatic,
indurated, smooth, and erythematous plaque
on the pretibial region of her left extremity (Figure 1,a)
Esophageal diverticulum: a case report
Esophagic diverticulum’s are a rare entity. The prevalence in the world population is reported to be less than 1%. They are generally diagnosed incidentally, have a higher peak of prevalence in the fifth decade of life, affecting men and women equally. The most common esophageal diverticula are epiphrenic and the main symptom is usually dysphagia. A case of a 74-year-old female with diagnosis of epiphrenic esophageal diverticulum is reported, which is treated with conservative management. The objective of this study was to describe a clinical case of esophageal diverticulum, as well as its etiology, clinical presentation, and therapeutic conduct. The screening of these patients must be focused on what the literature indicates, symptomatic patients with long-term evolution, the treatment will be surgical and with minimally invasive techniques so clinical evolution will be more favorable, reducing possible complications
What to do in case of an endoscopic image of gastric necrosis or ischaemia post-funduplication? A case report
The association of gastric ischemia with a fundoplication is very rare and its management is not always surgical. The present paper describes the mechanism of post-fundoplication gastric ischemia that occurred in a patient diagnosed with gastroesophageal reflux disease treated with a Nissen-type gastric fundoplication. A clinical case of the Foregut Clinic of the Hospital General de Mexico (HGM) is presented. This is a 24-year-old patient undergoing a Nissen-type fundoplication who was discharged without eventualities and who presented intestinal occlusion, acute gastric dilation and gastric ischemia
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