324 research outputs found
Aportes de Danzaterapia a la visión holÃstica de Terapia Ocupacional en el área de rehabilitación fÃsica
Tesis (Terapeuta Ocupacional)... respecto a Danzaterapia no hay estudios ni investigaciones como complemento a la práctica tradicional de la Terapia Ocupacional. Algunas de las áreas de Terapia Ocupacional donde es más utilizada la Danzaterapia son visual, discapacidad auditiva, entre otros. (Lavandez G, 2009). Es por esto que consideramos relevante poder indagar en esta disciplina para conocer los fundamentos de la Danzaterapia y como se puede complementar con la práctica de la Terapia Ocupacional, en donde esta tiene una mirada que se enfoca en recuperar la funcionalidad y normalizar un cuerpo para realizar una ocupación que sea efectiva en el ambiente (Gary Kielhofner)
Synthesis, characterization of a new carbonylated zirconium metallocene using a dichloro-zirconocene derived from partially alkylated s-indacene
Indexación: ScieloThis work describes the synthesis and characterization of new organometallic species, an unprecedented mononuclear zirconium complex bearing a tetraalkylated s-indacene ligand, and secondly, its respective dicarbonyl complex obtained by reduction with Mg/HgCl2. Theoretical calculations of these two compounds were carried out to gain further understanding of these novel molecular systems.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072009000300014&lng=es&nrm=is
Breaking the entangling gate speed limit for trapped-ion qubits using a phase-stable standing wave
All laser-driven entangling operations for trapped-ion qubits have hitherto
been performed without control of the optical phase of the light field, which
precludes independent tuning of the carrier and motional coupling. By placing
Sr ions in a nm standing wave, whose relative position
is controlled to , we suppress the carrier coupling by a
factor of , while coherently enhancing the spin-motion coupling. We
experimentally demonstrate that the off-resonant carrier coupling imposes a
speed limit for conventional traveling-wave M{\o}lmer-S{\o}rensen gates; we use
the standing wave to surpass this limit and achieve a gate duration of $15\
\mu$s, restricted by the available laser power.Comment: S. Saner and O. B\u{a}z\u{a}van contributed equally to this wor
Verifiable blind quantum computing with trapped ions and single photons
We report the first hybrid matter-photon implementation of verifiable blind quantum computing. We use a trapped-ion quantum server and a client-side photonic detection system networked via a fiber-optic quantum link. The availability of memory qubits and deterministic entangling gates enables interactive protocols without postselection - key requirements for any scalable blind server, which previous realizations could not provide. We quantify the privacy at ≲0.03 leaked classical bits per qubit. This experiment demonstrates a path to fully verified quantum computing in the cloud
Device-Independent Quantum Key Distribution
Cryptographic key exchange protocols traditionally rely on computational
conjectures such as the hardness of prime factorisation to provide security
against eavesdropping attacks. Remarkably, quantum key distribution protocols
like the one proposed by Bennett and Brassard provide information-theoretic
security against such attacks, a much stronger form of security unreachable by
classical means. However, quantum protocols realised so far are subject to a
new class of attacks exploiting implementation defects in the physical devices
involved, as demonstrated in numerous ingenious experiments. Following the
pioneering work of Ekert proposing the use of entanglement to bound an
adversary's information from Bell's theorem, we present here the experimental
realisation of a complete quantum key distribution protocol immune to these
vulnerabilities. We achieve this by combining theoretical developments on
finite-statistics analysis, error correction, and privacy amplification, with
an event-ready scheme enabling the rapid generation of high-fidelity
entanglement between two trapped-ion qubits connected by an optical fibre link.
The secrecy of our key is guaranteed device-independently: it is based on the
validity of quantum theory, and certified by measurement statistics observed
during the experiment. Our result shows that provably secure cryptography with
real-world devices is possible, and paves the way for further quantum
information applications based on the device-independence principle.Comment: 5+1 pages in main text and methods with 4 figures and 1 table; 37
pages of supplementary materia
Anti-interleukin 2 receptor monoclonal antibodies spare phenotypically distinct T suppressor cells in vivo and exert synergistic biological effects.
The therapeutic efficacies of ART-18, ART-65, and OX-39, mouse antibodies of IgG1 isotype recognizing distinct epitopes of the p55 beta chain of the rat IL-2-R molecule, were probed in LEW rat recipients of (LEW X BN)F1 heterotopic cardiac allografts (acute rejection in untreated hosts occurs within 8 d). A 10-d course with ART-18 prolongs graft survival to approximately 21 d (p less than 0.001). Therapy with ART-65, but not with OX-39, was effective (graft survival approximately 16 and 8 d, respectively). Anti-IL-2-R mAb treatment selectively spared T cells with donor-specific suppressor functions; the CD8+ (OX8+ W3/25-) fraction from ART-18-modified recipients, and primarily the CD4+ (W3/25+ OX8-) subset from ART-65-treated hosts conferred unresponsiveness to naive syngeneic rats after adoptive transfer, increasing test graft survival to approximately 16 and 45 d, respectively. Concomitant administration of ART-18 and ART-65 to recipient animals in relatively low doses exerted a strikingly synergistic effect, with 30% of the transplants surviving indefinitely and 50% undergoing late rejection over 50 d. These studies provide evidence that anti-IL-2-R mAbs selectively spare phenotypically distinct T cells with suppressor functions. The data also suggest that in vivo targeting of functionally different IL-2-R epitopes may produce synergistic biological effects
First 230 GHz VLBI Fringes on 3C 279 using the APEX Telescope
We report about a 230 GHz very long baseline interferometry (VLBI) fringe
finder observation of blazar 3C 279 with the APEX telescope in Chile, the
phased submillimeter array (SMA), and the SMT of the Arizona Radio Observatory
(ARO). We installed VLBI equipment and measured the APEX station position to 1
cm accuracy (1 sigma). We then observed 3C 279 on 2012 May 7 in a 5 hour 230
GHz VLBI track with baseline lengths of 2800 M to 7200 M and
a finest fringe spacing of 28.6 micro-arcseconds. Fringes were detected on all
baselines with SNRs of 12 to 55 in 420 s. The correlated flux density on the
longest baseline was ~0.3 Jy/beam, out of a total flux density of 19.8 Jy.
Visibility data suggest an emission region <38 uas in size, and at least two
components, possibly polarized. We find a lower limit of the brightness
temperature of the inner jet region of about 10^10 K. Lastly, we find an upper
limit of 20% on the linear polarization fraction at a fringe spacing of ~38
uas. With APEX the angular resolution of 230 GHz VLBI improves to 28.6 uas.
This allows one to resolve the last-photon ring around the Galactic Center
black hole event horizon, expected to be 40 uas in diameter, and probe radio
jet launching at unprecedented resolution, down to a few gravitational radii in
galaxies like M 87. To probe the structure in the inner parsecs of 3C 279 in
detail, follow-up observations with APEX and five other mm-VLBI stations have
been conducted (March 2013) and are being analyzed.Comment: accepted for publication in A&
El primer aporte de los obispos de Brasil a la codificación del derecho canónico de 1917: los 'postulata' de los arzobispos de San Salvador de BahÃa y de Rio de Janeiro
Genetic variation in a small bivalve along a retreating glacier fjord, King George Island, Antarctica.
Climate change is strongly influencing regions of Antarctica but the consequences on microevolutionary processes have been little studied. Patterns of population genetic diversity were analysed in the Antarctic bivalve Nuculana inaequisculpta (Protobranchia: Nuculanidae) from a fjord with 70 years of documented climate-forced glacier retreat. Thirty-nine individuals from five sites at different distances from the glacier terminus were collected, and the COI gene was sequenced from each individual. No statistically significant genetic differentiation was found between sites nor a significant correlation between the proximity of glaciers and genetic diversity, suggesting a high dispersal capability and therefore, a planktonic larval stage for this species. Nevertheless, we encourage increasing the sample size and number of loci in future studies to confirm our findings
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