3,822 research outputs found
Cytological and Molecular Characterization of Wheat Lines with Thinopyrum intermedium Chromosome Additions, Substitutions and Translocations Resistant to Barley Yellow Dwarf Virus.
La función autocaptura en marcapasos VVIR. Experiência del estudio multicéntrico
La función de Autocaptura verifica la captura latido a latido. La búsqueda automática del umbral de estimulación, ajusta el potencial de salida 0.3 V. por encima del valor medido. Ante la pérdida de captura de un estímulo, el sistema emite un segundo impulso de 4.5 V. a los 65 mseg. para conseguir captura, evitando con ello pausas del ritmo cardíaco. La función de Autocaptura nos ofrece por ello una estimulación segura de bajo consumo. El sistema ha sido incorporado a un marcapasos VVI R de 12.8 gr. de peso y 5.9 cm3 de volumen, de estimulación unipolar y detección bipolar. Presentamos la experiencia de un estudio multicéntrico que incluye 113 pacientes, 57 hombres y 56 mujeres. La edad media fue de 76 anos (45 - 93). La indicación ECG fue de fibrilación auricular con pobre respuesta ventricular en el 84% de los casos y de bloqueo A-V en el restante 16%. Se han revisado los protocolos de 112 controles de alta hospitalaria, 107 de 30 dias, 94 de 3 meses y 49 de 6 meses. En todos los casos se ha practicado un registro Holter de 24 horas al mes de la implantacion. EI valor medio de umbral de estimulación en el momenta de la implantación fue de 0.6 V., a 1 mes de 1.3 V., a los 3 meses de 1.3 V. Y a los 6 meses de 1.2 V. Los valores medios medidos de onda R intrínseca / onda R evocada fueron en la implantación de 14.7/10.2 mV., al mes 16.8/ 10.0 mV., a los 3 meses 16.5/10.2 mV. ya los 6 meses 17.5/10.2 mV. Se ha calculado un consumo medio de 3.9 ± 0.8 mAo con 10 que la longevidad del generador resulta de entre 7 y 8 anos. El análisis latido a latido de 3.7 millones de estímulos de los registros Holter, nos confirma que cada perdida de captura ha sido detectada y seguida de un estímulo de seguridad efectivo. Conclusion: La función Autocaptura posee la habilidad de cambiar automaticamente el potencial de salida en consonancia con el umbral de estimulación, y por ello nos permite olrecer una terapia de estimulacion segura y liable con bajo consumo energético
La función autocaptura en marcapasos VVIR. Experiência del estudio multicéntrico
La función de Autocaptura verifica la captura latido a latido. La búsqueda automática del umbral de estimulación, ajusta el potencial de salida 0.3 V. por encima del valor medido. Ante la pérdida de captura de un estímulo, el sistema emite un segundo impulso de 4.5 V. a los 65 mseg. para conseguir captura, evitando con ello pausas del ritmo cardíaco. La función de Autocaptura nos ofrece por ello una estimulación segura de bajo consumo. El sistema ha sido incorporado a un marcapasos VVI R de 12.8 gr. de peso y 5.9 cm3 de volumen, de estimulación unipolar y detección bipolar. Presentamos la experiencia de un estudio multicéntrico que incluye 113 pacientes, 57 hombres y 56 mujeres. La edad media fue de 76 anos (45 - 93). La indicación ECG fue de fibrilación auricular con pobre respuesta ventricular en el 84% de los casos y de bloqueo A-V en el restante 16%. Se han revisado los protocolos de 112 controles de alta hospitalaria, 107 de 30 dias, 94 de 3 meses y 49 de 6 meses. En todos los casos se ha practicado un registro Holter de 24 horas al mes de la implantacion. EI valor medio de umbral de estimulación en el momenta de la implantación fue de 0.6 V., a 1 mes de 1.3 V., a los 3 meses de 1.3 V. Y a los 6 meses de 1.2 V. Los valores medios medidos de onda R intrínseca / onda R evocada fueron en la implantación de 14.7/10.2 mV., al mes 16.8/ 10.0 mV., a los 3 meses 16.5/10.2 mV. ya los 6 meses 17.5/10.2 mV. Se ha calculado un consumo medio de 3.9 ± 0.8 mAo con 10 que la longevidad del generador resulta de entre 7 y 8 anos. El análisis latido a latido de 3.7 millones de estímulos de los registros Holter, nos confirma que cada perdida de captura ha sido detectada y seguida de un estímulo de seguridad efectivo. Conclusion: La función Autocaptura posee la habilidad de cambiar automaticamente el potencial de salida en consonancia con el umbral de estimulación, y por ello nos permite olrecer una terapia de estimulacion segura y liable con bajo consumo energético
Long-term gamma-ray observations of the binary HESS J0632+057 with H.E.S.S., MAGIC and VERITAS
The gamma-ray binary HESS J0632+057 has been observed at very-high energies
(E 100 GeV) for more than ten years by the major systems of imaging
atmospheric Cherenkov telescopes. We present a summary of results obtained with
the H.E.S.S., MAGIC, and VERITAS experiments based on roughly 440 h of
observations in total. This includes a discussion of an unusually bright TeV
outburst of HESS J0632+057 in January 2018. The updated gamma-ray light curve
now covers all phases of the orbital period with significant detections in
almost all orbital phases. Results are discussed in context with simultaneous
observations with the X-ray Telescope onboard the Neil Gehrels Swift
Observatory.Comment: Proceedings of the 36th International Cosmic Ray Conference
(ICRC2019) Madison, WI July 24-Aug 1, 201
Measurement of the Analyzing Power in \\with a Fast Forward --Diproton
A measurement of the analyzing power of the
reaction was carried out at beam energies of 0.5 and 0.8 GeV by detection of a
fast forward proton pair of small excitation energy MeV. The
kinematically complete experiment made use of the ANKE spectrometer at the
internal beam of COSY and a deuterium cluster--jet target. For the first time
the --wave dominance in the fast diproton is experimentally demonstrated in
this reaction. While at GeV the measured analyzing power
vanishes, it reaches almost unity at GeV for neutrons scattered at
. The results are compared with a model taking into
account one--nucleon exchange, single scattering and (1232) excitation
in the intermediate state. The model describes fairly well the unpolarized
cross section obtained earlier by us and the analyzing power at 0.8 GeV, it
fails to reproduce the angular dependence of at 0.5 GeV.Comment: 4 pages, 4 figures, 1 tabl
Progress in Monte Carlo design and optimization of the Cherenkov Telescope Array
The Cherenkov Telescope Array (CTA) will be an instrument covering a wide
energy range in very-high-energy (VHE) gamma rays. CTA will include several
types of telescopes, in order to optimize the performance over the whole energy
range. Both large-scale Monte Carlo (MC) simulations of CTA super-sets
(including many different possible CTA layouts as sub-sets) and smaller-scale
simulations dedicated to individual aspects were carried out and are on-going.
We summarize results of the prior round of large-scale simulations, show where
the design has now evolved beyond the conservative assumptions of the prior
round and present first results from the on-going new round of MC simulations.Comment: 4 pages, 5 figures. In Proceedings of the 33rd International Cosmic
Ray Conference (ICRC2013), Rio de Janeiro (Brazil). All CTA contributions at
arXiv:1307.223
Determination of Deuteron Beam Polarizations at COSY
The vector and tensor polarizations of a deuteron beam have been measured
using elastic deuteron-carbon scattering at 75.6 MeV and deuteron-proton
scattering at 270 MeV. After acceleration to 1170 MeV inside the COSY ring, the
polarizations of the deuterons were checked by studying a variety of nuclear
reactions using a cluster target at the ANKE magnet spectrometer placed at an
internal target position of the storage ring. All these measurements were
consistent with the absence of depolarization during acceleration and provide a
number of secondary standards that can be used in subsequent experiments at the
facility.Comment: 12 pages, 13 figure
Search for eta-mesic 4He in the dd->3He n pi0 and dd->3He p pi- reactions with the WASA-at-COSY facility
The search for 4He-eta bound states was performed with the WASA-at-COSY
facility via the measurement of the excitation function for the dd->3He n pi0
and dd->3He p pi- processes. The beam momentum was varied continuously between
2.127 GeV/c and 2.422 GeV/c, corresponding to the excess energy for the dd->4He
eta reaction ranging from Q=-70 MeV to Q=30 MeV. The luminosity was determined
based on the dd->3He n reaction and quasi-free proton-proton scattering via
dd->pp n_spectator n_spectator reactions. The excitation functions determined
independently for the measured reactions do not reveal a structure which could
be interpreted as a narrow mesic nucleus. Therefore, the upper limits of the
total cross sections for the bound state production and decay in
dd->(4He-eta)_bound->3He n pi0 and dd->(4He-eta)_bound->3He p pi- processes
were determined taking into account the isospin relation between both the
channels considered. The results of the analysis depend on the assumptions of
the N* momentum distribution in the anticipated mesic-4He. Assuming as in the
previous works, that this is identical with the distribution of nucleons bound
with 20 MeV in 4He, we determined that (for the mesic bound state width in the
range from 5 MeV to 50 MeV) the upper limits at 90% confidence level are about
3 nb and about 6 nb for npi0 and ppi- channels, respectively. However, based on
the recent theoretical findings of the N*(1535) momentum distribution in the
N*-3He nucleus bound by 3.6 MeV, we find that the WASA-at-COSY detector
acceptance decreases and hence the corresponding upper limits are 5 nb and 10
nb for npi0 and ppi- channels respectively.Comment: This article will be submitted to JHE
- …