133 research outputs found
Formal equivalence between Tsallis and extended Boltzmann-Gibbs statistics
A formal correspondence between the q-distribution obtained from the Tsallis
entropy and non-maxwellian distributions obtained from the Boltzmann-Gibbs
entropy is afforded.Comment: 3 pages. Comments are wellcome to [email protected]
Partial teleportation of entangled atomic states
In this paper we propose a scheme for partially teleporting entangled atomic
states. Our scheme can be implemented using only four two-level atoms
interacting either resonantly or off-resonantly with a single cavity-QED. The
estimative of losses occurring during this partial teleportation process is
accomplished through the phenomenological operator approach technique.Comment: 4 pages, 3 figure
Teleportation of a Zero-and One-photon Running Wave State by Projection Synthesis
We show how to teleport a running wave superposition of zero- and one-photon
field state through the projection synthesis technique. The fidelity of the
scheme is computed taking into account the noise introduced by dissipation and
the efficiency of the detectors. These error sources have been introduced
through a single general relationship between input and output operators.Comment: 11 pages, 1 figur
Decoherence in trapped ions due to polarization of the residual background gas
We investigate the mechanism of damping and heating of trapped ions
associated with the polarization of the residual background gas induced by the
oscillating ions themselves. Reasoning by analogy with the physics of surface
electrons in liquid helium, we demonstrate that the decay of Rabi oscillations
observed in experiments on 9Be+ can be attributed to the polarization phenomena
investigated here. The measured sensitivity of the damping of Rabi oscillations
with respect to the vibrational quantum number of a trapped ion is also
predicted in our polarization model.Comment: 26 pdf pages with 5 figures, http://www.df.ufscar.br/~quantum
The controlled teleportation of an arbitrary two-atom entangled state in driven cavity QED
In this paper, we propose a scheme for the controlled teleportation of an
arbitrary two-atom entangled state
in driven cavity QED.
An arbitrary two-atom entangled state can be teleported perfectly with the help
of the cooperation of the third side by constructing a three-atom GHZ entangled
state as the controlled channel. This scheme does not involve apparent (or
direct) Bell-state measurement and is insensitive to the cavity decay and the
thermal field. The probability of the success in our scheme is 1.0.Comment: 10 page
HEALTHCARE PROCESS OF THE PATIENT WITH ACUTE PANCREATITIS
Akutni pankreatitis je nagla upala gušterače koja se može javiti u blagom ili teškom obliku. Ova nagla upala se u gotovo 80% prijema u bolnicu pripisuje postojanju žučnih kamenaca ili konzumaciji alkohola. Žučni kamenci kao uzrok budu 1,5 puta češći kod žena, dok se alkohol kao uzrok u muškaraca pojavljuje šest puta više nego kod žena. Žučni kamenci najčešće začepe otvor pankreatičnog voda ili se na neko vrijeme zaustave u Oddijevu sfinkteru uzrokujući time upalu dok svakodnevna konzumacija alkohola također može dovesti do začepljenja malih vodova. Jaki bolovi se javljaju najčešće naglo nakon konzumacije prekomjerne količine obroka ili alkohola u gornjem srednjem dijelu abdomena. Osim što je bol nagla, pacijenti je opisuju kao probadajuću bol koja se širi u leđa. Može se javiti mučnina kao i nagon na povraćanje, u većini slučajeva popratnu uz temperaturu. Bolesnik se javlja u hitni trakt radi jakih bolova koji se ne smanjuju te se podvrgava daljnjoj dijagnostici. Laboratorijskim pretragama ne može se potvrditi dijagnoza akutnog pankreatitisa ali povišenom razinom enzima gušterače tu dijagnozu možemo potkrijepiti. Daljnjim radiološkim pretragama (rendgen abdomena, kompjutorizirana tomografija) dokazuje se mogućnost postojanja žučnih kamenaca kao i promjene u veličini i strukturi gušterače. Sa utvrđenom dijagnozom akutnog pankreatitisa, osoba se zaprima na odjel gdje se prekida daljnji unos hrane i pića kako bi se smanjila daljnja proizvodnja enzima u gušterači. Svu potrebnu tekućinu i ostale hranjive tvari nadoknađuju se intravenskim putem. U cijelom procesu liječenja ključna je i medicinska sestra koja najprije može uočiti eventualne promjene koje se mogu javiti kod pacijenta, kao što su primjerice smanjeno mokrenje, otežano disanje te stagniranje ili pogoršavanje intenziteta boli unatoč primijenjenoj analgetskoj terapiji.Acute pancreatitis is a sudden pancreatic inflammation occurring in mild or severe form. This sudden inflammation in almost 80% of admission to the hospital is attributed to the existence of gallstones or drinking alcohol. The gallstones as a cause of Acute pancreatitis are 1.5 times more common in women, while alcohol as a cause is present men appears six times more than in women. Gallstones usually close the pancreatic opening or stop for a while in Oddies sphincter causing it to inflate ,while daily alcohol consumption also leads to clogging of small lines. Strong pain usually are occurring suddnely after eating excessive meals or presence of alcohol in the upper mid-section of the abdomen. Apart pain is acute, patients are describeing as a stabbing kind of pain that is spreading in their back. There can be nausea and vomiting, in most cases accompanied by temperature. The patient is coming to an emergency with severe pain that does not diminish and undergoes further diagnosis. Laboratory examinations can not confirm the diagnosis of acute pancreatitis but elevated pancreatic enzyme levels can be supported by this diagnosis. Further radiological examinations (X-ray abdomena, computerized tomography) are proveing the possibility of gallstones as well as changes in the size and structure of the pancreas. With established diagnosis of acute pancreatitis, a person is hospitalized in intensice care where further food and drink intake is discontinued in order to reduce further enzyme production in the pancreas. All the necessary fluid and other nutrients are compensated by the intravenous. Throughout the process of treatment, role of nurse is also crucial to notice possible changes that may occur in the patient, such as decreased urination, difficulty breathing and stagnation or aggravation of pain intensity despite analgesic therapy
Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory
Data from the Pierre Auger Observatory are analyzed to search for
anisotropies near the direction of the Galactic Centre at EeV energies. The
exposure of the surface array in this part of the sky is already significantly
larger than that of the fore-runner experiments. Our results do not support
previous findings of localized excesses in the AGASA and SUGAR data. We set an
upper bound on a point-like flux of cosmic rays arriving from the Galactic
Centre which excludes several scenarios predicting sources of EeV neutrons from
Sagittarius . Also the events detected simultaneously by the surface and
fluorescence detectors (the `hybrid' data set), which have better pointing
accuracy but are less numerous than those of the surface array alone, do not
show any significant localized excess from this direction.Comment: Matches published versio
The Fluorescence Detector of the Pierre Auger Observatory
The Pierre Auger Observatory is a hybrid detector for ultra-high energy
cosmic rays. It combines a surface array to measure secondary particles at
ground level together with a fluorescence detector to measure the development
of air showers in the atmosphere above the array. The fluorescence detector
comprises 24 large telescopes specialized for measuring the nitrogen
fluorescence caused by charged particles of cosmic ray air showers. In this
paper we describe the components of the fluorescence detector including its
optical system, the design of the camera, the electronics, and the systems for
relative and absolute calibration. We also discuss the operation and the
monitoring of the detector. Finally, we evaluate the detector performance and
precision of shower reconstructions.Comment: 53 pages. Submitted to Nuclear Instruments and Methods in Physics
Research Section
Atmospheric effects on extensive air showers observed with the Surface Detector of the Pierre Auger Observatory
Atmospheric parameters, such as pressure (P), temperature (T) and density,
affect the development of extensive air showers initiated by energetic cosmic
rays. We have studied the impact of atmospheric variations on extensive air
showers by means of the surface detector of the Pierre Auger Observatory. The
rate of events shows a ~10% seasonal modulation and ~2% diurnal one. We find
that the observed behaviour is explained by a model including the effects
associated with the variations of pressure and density. The former affects the
longitudinal development of air showers while the latter influences the Moliere
radius and hence the lateral distribution of the shower particles. The model is
validated with full simulations of extensive air showers using atmospheric
profiles measured at the site of the Pierre Auger Observatory.Comment: 24 pages, 9 figures, accepted for publication in Astroparticle
Physic
The exposure of the hybrid detector of the Pierre Auger Observatory
The Pierre Auger Observatory is a detector for ultra-high energy cosmic rays.
It consists of a surface array to measure secondary particles at ground level
and a fluorescence detector to measure the development of air showers in the
atmosphere above the array. The "hybrid" detection mode combines the
information from the two subsystems. We describe the determination of the
hybrid exposure for events observed by the fluorescence telescopes in
coincidence with at least one water-Cherenkov detector of the surface array. A
detailed knowledge of the time dependence of the detection operations is
crucial for an accurate evaluation of the exposure. We discuss the relevance of
monitoring data collected during operations, such as the status of the
fluorescence detector, background light and atmospheric conditions, that are
used in both simulation and reconstruction.Comment: Paper accepted by Astroparticle Physic
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