1,219 research outputs found
An apparent GRBs evolution around us or a sampling of thin GRB beaming jets?
The gamma ray burst apparent average isotropic power versus their red-shift
of all known GRB (Sept.2009) is reported. It calls for an unrealistic Gamma Ray
Burst Evolution around us or it just probe the need of a very thin gamma
precession-jet model. These precessing and spinning jet are originated by
Inverse Compton and-or Synchrotron Radiation at pulsars or micro-quasars
sources, by ultra-relativistic electrons. These Jets are most powerful at
Supernova birth, blazing, once on axis, to us and flashing GRB detector. The
trembling of the thin jet (spinning, precessing, bent by magnetic fields)
explains naturally the observed erratic multi-explosive structure of different
GRBs and its rare re-brightening. The jets are precessing (by binary companion
or inner disk asymmetry) and decaying by power law on time scales to a few
hours. GRB blazing occurs inside the observer cone of view only a seconds
duration times; because relativistic synchrotron (or IC) laws the jet angle is
thinner in gamma but wider in X band. Its apparent brightening is so well
correlated with its hardness (The Amati correlation). This explain the wider
and longer X GRB afterglow duration and the (not so much) rare presence of
X-ray precursors well before the apparent main GRB explosion. The jet lepton
maybe originated by an inner primary hadron core (as well as pions and muons
secondary Jets). The EGRET, AGILE and Fermi few hardest and late GeV gamma
might be PeV neutron beta decay in flight observed in-axis under a relativistic
shrinkage.Comment: 13 pages, 11 figures, Vulcano 200
Inconsistence of super-luminal Cern-Opera neutrino speed with observed SN1987A burst and neutrino mixing for any imaginary neutrino mass
We tried to fit in any way the recent Opera-Cern claims of a neutrino
super-luminal speed with observed Supernova SN1987A neutrino burst and all (or
most) neutrino flavor oscillation. We considered three main frame-works: (1) A
tachyon imaginary neutrino mass, whose timing is nevertheless in conflict with
observed IMB-Kamiokande SN1987A burst by thousands of billion times longer. (2)
An ad hoc anti-tachyon model whose timing shrinkage may accommodate SN1987A
burst but greatly disagree with energy independent Cern-Opera super-luminal
speed. (3) A split neutrino flavor speed (among a common real mass relativistic
neutrino electron component and a super-luminal neutrino {\mu}) in an ad hoc
frozen speed scenario that is leading to the prompt neutrino de-coherence and
the rapid flavor mixing (between electron and muon ones) that are in conflict
with most oscillation records. Therefore we concluded that an error must be
hidden in Opera-Cern time calibration (as indeed recent rumors seem to
confirm). We are also reminding the relevance of the guaranteed minimal
atmospheric neutrino mass whose detection may be achieved by a milliseconds
graviton-neutrino split time delay among gravity burst and neutronization
neutrino peak in any future SN explosion in Andromeda recordable in Megaton
neutrino detector.Comment: 5 pages, 4 figures, corrected and updated atmospheric neutrino
simulatio
Analisi e valorizzazione dello stock dell'Oreal Paris
Indice generale
Introduzione
Analisi stock terzisti
Valutazione dei materiali a stock
Analisi delle PLV uscite da Giugno 2004 a Luglio 2005
Classificazione ABC dei prodotti finiti
Analisi di Pareto dei prodotti finiti
Conclusion
The XRF080109-SN2008D and a decade of GRB-Jet-SN connection
Last and nearest GRB-XRF 080109 has been an exceptional lesson on GRB nature.
After a decade (since 25 April 08) we know that Supernovae may often contain a
Jet. Its persistent activity may shine on axis as a GRBs. Such a persistent,
thin beamed gamma jet may be powered by either a BH (Black Holes) or Pulsars.
Late stages of these jets may loose the SN traces and appear as a short GRB or
a long orphan GRB (depending on jet angular velocity and view angle). XRF are
peripherical viewing of the jets. These precessing and spinning gamma jet are
originated by Inverse Compton and-or Synchrotron Radiation at pulsars or
micro-quasars sources, by ultra-relativistic electrons. These Jets are most
powerful at Supernova birth, blazing, once on axis, to us and flashing GRB
detector. The trembling of the thin jet explains naturally the observed erratic
multi-explosive structure of different GRBs. The jets are precessing (by binary
companion or inner disk asymmetry) and decaying by power on time scales of few
hours, but they keep staying inside the observer cone view only a few seconds
duration times (GRB); the jet is thinner in gamma and wider in X band. This
explain the wider and longer X GRB afterglow duration and the rare presence of
X-ray precursors.Comment: 11 pages, 12 figure
Why Tau First?
Electron neutrino has been the first neutral lepton to be foreseen and
discovered last century. The un-ordered muon and its neutrino arose later by
cosmic rays. The tau discover, the heaviest, the most unstable charged lepton,
was found surprisingly on 1975. Its neutrino was hardly revealed just on 2000.
So why High Energy Neutrino Astronomy should rise first via tau neutrino, the
last, the most rare one? The reasons are based on a chain of three favorable
coincidences found last decade: the neutrino masses and their flavor mixing,
the UHECR opacity on Cosmic Black Body (GZK cut off on BBR), the amplified tau
air-shower decaying in flight. Indeed guaranteed UHE GZK tau neutrinos, feed by
muon mixing, while skimming the Earth might lead to boosted UHE tau, mostly
horizontal ones. These UHE lepton decay in flight are spread, amplified, noise
free Air-Shower: a huge event for an unique particle. To be observed soon:
within Auger sky, in present decade. Its discover may sign of the first tau
appearance.Comment: 8 pages, 4 figure
Iodine status in schoolchildren and pregnant women of Lazio, a central Region of Italy
The inhabitants of Lazio, similarly to those of other Italian regions, have been historically exposed to the detrimental effects of an inadequate intake of iodine. The latter is a micronutrient essential for the biosynthesis of thyroid hormones (TH). Iodine deficiency is responsible for a number of adverse effects on human health known as iodine deficiency disorders (IDD), the most common of which worldwide are goiter and hypothyroidism. In order to reduce IDD, a national salt iodination program was started in Italy in 2005. In this article we reviewed the available data regarding iodine intake in the Lazio population before and after the introduction of the national salt iodination program, in order to evaluate its efficacy and the eventual problem(s) limiting its success. On the whole, the information acquired indicates that, following the introduction of the program, the dietary iodine intake in the Lazio population is improved. There is, however, still much work ahead to ameliorate the iodine prophylaxis in this region. In fact, although a generally adequate iodine intake in school-age children has been observed, there are still areas where a mild iodine insufficiency is present. Moreover, two independent epidemiological surveys on pregnant women evidenced a low urinary iodine concentration with respect to the reference range conceived by the World Health Organization. These findings demonstrate the need for greater attention to the iodine prophylaxis by health care providers (i.e., obstetricians, gynecologists, pediatricians, etc.), and the implementation of effective advertising campaigns aimed at increasing the knowledge and awareness of the favorable effects of iodine supplementation on population health
The role of collagenase in emphysema
The extracellular matrix is essential for the integrity of the lung and when disrupted can lead to the architectural changes seen in emphysema. The etiology of emphysema is believed to be due to an imbalance in the proteases and antiproteases within the lung. Studies have focused on elastolytic enzymes as the primary agents in disease pathogenesis, however, recent data suggest that collagenases may also be involved in the destruction of lung tissue in emphysema. It is hoped that this expanded understanding of the pathophysiology of emphysema will lead to improved therapy in the treatment of the disease
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