215 research outputs found
Digital Signal Processing Education: Technology and Tradition
In this paper we discuss a DSP course presented to both University students and to participants on industrial short courses. The "traditional" DSP course will typically run over one to two semesters and usually cover the fundamental mathematics of z-, Laplace and Fourier transforms, followed by the algorithm and application detail. In the course we will discuss, the use of advanced DSP software and integrated support software allow the presentation time to be greatly shortened and more focussed algorithm and application learning to be introduced. By combining the traditional lecture with the use of advanced DSP software, all harnessed by the web, we report on the objectives, syllabus, and mode of teaching
Attack and destruction of the Monte Bernorio oppidvm and the establishment of a roman castellvm
El "oppidum" de Monte Bernorio resulta bien conocido como una de las ciudades fortificadas de la Edad del Hierro más importantes del cantábrico. En las campañas militares que el emperador Octavio Augusto desencadeno contra "Cántabros y Ástures" la conquista de este "oppidum" resultó esencial, como demuestran las recientes campañas de excavación arqueológicas. Se presentan en este trabajo algunas novedades relacionadas con el descubrimiento, en su "acrópolis", del "agger" de un "castellum" romano construido aprovechando en parte el dispositivo defensivo indígena. Este "castellum" tuvo varias fases de ocupación sucesivas con al menos dos reconstrucciones de las estructuras defensivas de esta fortificación.Monte Bernorio Hillfort is a very well known "oppidum" and one of the most important Iron Age sites in the North of Spain. The siege of this "oppidum" was essential during Emperor Augustus’ military campaign against Cantabrian and Asturian peoples, as shown by the latest archaeological researches in this site. In this paper we introduce new findings regarding the discovery, in the "acropolis" of the hillfort, of the "agger" of a Roman fort, built using some parts of the indigenous defenses. The roman fort has experienced different occupation periods with no less than two different phases
The XXL Survey VII: A supercluster of galaxies at z=0.43
The XXL Survey is the largest homogeneous and contiguous survey carried out
with XMM-Newton. Covering an area of 50 square degrees distributed over two
fields, it primarily investigates the large-scale structures of the Universe
using the distribution of galaxy clusters and active galactic nuclei as tracers
of the matter distribution. Given its depth and sky coverage, XXL is
particularly suited to systematically unveiling the clustering of X-ray
clusters and to identifying superstructures in a homogeneous X-ray sample down
to the typical mass scale of a local massive cluster. A friends-of-friends
algorithm in three-dimensional physical space was run to identify large-scale
structures. In this paper we report the discovery of the highest redshift
supercluster of galaxies found in the XXL Survey. We describe the X-ray
properties of the clusters members of the structure and the optical follow-up.
The newly discovered supercluster is composed of six clusters of galaxies at a
median redshift z around 0.43 and distributed across approximately 30 by 15 arc
minutes (10 by 5 Mpc on sky) on the sky. This structure is very compact with
all the clusters residing in one XMM pointing; for this reason this is the
first supercluster discovered with the XXL Survey. Spectroscopic follow-up with
WHT (William Herschel Telescope) and NTT (New Technology Telescope) confirmed a
median redshift of z = 0.43. An estimate of the X-ray mass and luminosity of
this supercluster and of its total gas mass put XLSSC-e at the average mass
range of superclusters; its appearance, with two members of equal size, is
quite unusual with respect to other superclusters and provides a unique view of
the formation process of a massive structure.Comment: A&A, accepted; special XXL issu
Time Trends in Survival Following First Hemorrhagic or Ischemic Stroke Between 1991 and 2015 in the Rotterdam Study
Background and Purpose- The introduction of stroke units and the implementation of evidence-based interventions have been a breakthrough in the management
The effects of dynamical substructure on Milky Way mass estimates from the high velocity tail of the local stellar halo
We investigate the impact of dynamical streams and substructure on estimates
of the local escape speed and total mass of Milky Way-mass galaxies from
modelling the high velocity tail of local halo stars. We use a suite of
high-resolution, magneto-hydrodynamical cosmological zoom-in simulations, which
resolve phase space substructure in local volumes around solar-like positions.
We show that phase space structure varies significantly between positions in
individual galaxies and across the suite. Substructure populates the high
velocity tail unevenly and leads to discrepancies in the mass estimates. We
show that a combination of streams, sample noise and truncation of the high
velocity tail below the escape speed leads to a distribution of mass estimates
with a median that falls below the true value by , and a spread of
a factor of 2 across the suite. Correcting for these biases, we derive a
revised value for the Milky Way mass presented in Deason et al. of .Comment: Re-submitted to MNRAS Letters after minor revisio
Adropin and apelin fluctuations throughout a season in professional soccer players : are they related with performance?
Myokines are likely to be involved in the whole-body metabolic adaptive changes that occur in response to regular exercise. We aimed to investigate the association of the two myokines (adropin and apelin) with physical performance in professional soccer players. To this purpose, we analyzed the fluctuations of circulating levels of both adropin and apelin in professional soccer players during a season and evaluated the possible association of these myokines with the performance level. Creatine kinase (CK) and lactate dehydrogenase (LDH) activity as well as iron, transferrin and high-sensitivity C-Reactive protein (hsCRP), ferritin, soluble transferrin receptor (sTfR), free testosterone/cortisol ratio (FTCR), total iron binding capacity (TIBC) were also determined. Fifteen male professional soccer players from an Italian Serie A team were included in this study. Regarding the results of the biochemical analyses, the patterns of changes in the biomarkers of fatigue and inflammation, i.e., HsCRP, CK and LDH reflected the effects of the training throughout the season. No significant changes were observed in adropin, while apelin exhibited variations that seem not to be related with performance. In addition, both adropin and apelin did not represent valuable strategy to assist in the performance assessment of professional soccer players
Exercise effects on erythrocyte deformability in exercise-induced arterial hypoxemia
Exercise-induced arterial hypoxemia (EIAH) is often found in endurance-trained subjects at high exercise intensity. The role of erythrocyte deformability (ED) in EIAH has been scarcely explored. We aimed to explore the role of erythrocyte properties and lactate accumulation in the response of ED in EIAH. ED was determined in 10 sedentary and in 16 trained subjects, both before and after a maximal incremental test, and after recovery, along with mean corpuscular volume (MCV) and red blood cell lactate concentrations. EIAH was found in 6 trained subjects ( 06SaO2=-8.25\ub14.03%). Sedentary and non-EIAH trained subjects showed reduced ED after exercise, while no effect on ED was found in EIAH trained subjects. After exercise, lactate concentrations rose and MCV increased equally in all groups. ED is strongly driven by cell volume, but the different ED response to exercise in EIAH shows that other cellular mechanisms may be implicated. Interactions between membrane and cytoskeleton, which have been found to be O2-regulated, play a role in ED. The drop in SaO2 in EIAH subjects can improve ED response to exercise. This can be an adaptive mechanism that enhances muscular and pulmonary perfusion, and allows the achievement of high exercise intensity in EIAH despite lower O2 arterial transport
Rectus sheath hematoma: three case reports
<p>Abstract</p> <p>Introduction</p> <p>Rectus sheath hematoma is an uncommon cause of acute abdominal pain. It is an accumulation of blood in the sheath of the rectus abdominis, secondary to rupture of an epigastric vessel or muscle tear. It could occur spontaneously or after trauma. They are usually located infraumblically and often misdiagnosed as acute abdomen, inflammatory diseases or tumours of the abdomen.</p> <p>Case presentation</p> <p>We reported three cases of rectus sheath hematoma presenting with a mass in the abdomen and diagnosed by computerized tomography. The patients recovered uneventfully after bed rest, intravenous fluid replacement, blood transfusion and analgesic treatment.</p> <p>Conclusion</p> <p>Rectus sheath hematoma is a rarely seen pathology often misdiagnosed as acute abdomen that may lead to unnecessary laparotomies. Computerized tomography must be chosen for definitive diagnosis since ultrasonography is subject to error due to misinterpretation of the images. Main therapy is conservative management.</p
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