1,668 research outputs found
New ground-based observational methods and instrumentation for asteroseismology
Space instrumentation like SOHO, MOST, CoRoT and Kepler has been and is being
built to attain very high precision data to be used for asteroseismic analysis.
Nonetheless, there is a very strong need for providing additional information,
especially on mode identification. With this contribution I will review the
efforts been put on new ground-based instrumentation and the methodology that
can be used to achieve this aim.Comment: 6 pages. Review contribution to be published in Astrophysics and
Space Science Proceedings series (ASSP), in the proceedings of "20th Stellar
Pulsation Conference Series: Impact of new instrumentation and new insights
in stellar pulsations", 5-9 September 2011, Granada, Spai
Circularly Polarized Resonant Rayleigh Scattering and Skyrmions in the = 1 Quantum Hall Ferromagnet
We use the circularly polarized resonant Rayleigh scattering (RRS) to study
the quantum Hall ferromagnet at = 1. At this filling factor we observe a
right handed copolarized RRS which probes the Skyrmion spin texture of the
electrons in the photoexcited grounds state. The resonant scattering is not
present in the left handed copolarization, and this can be related to the
correlation between Skymionic effects, screening and spin wave excitations.
These results evidence that RRS is a valid method for the study of the spin
texture of the quantum Hall states
Psychotherapy Augmentation through Preconscious Priming.
OBJECTIVE: To test the hypothesis that repeated preconscious (masked) priming of personalized positive cognitions could augment cognitive change and facilitate achievement of patients' goals following a therapy.
METHODS: Twenty social phobic patients (13 women) completed a 36-weeks study beginning by 12 weeks of group behavioral therapy. After the therapy, they received 6 weeks of preconscious priming and 6 weeks of a control procedure in a randomized cross-over design. The Priming condition involved listening twice daily with a passive attitude to a recording of individualized formulations of appropriate cognitions and attitudes masked by music. The Control condition involved listening to an indistinguishable recording where the formulations had been replaced by random numbers. Changes in social cognitions were measured by the Social Interaction Self Statements Test (SISST).
RESULTS: Patients improved following therapy. The Priming procedure was associated with increased positive cognitions and decreased negative cognitions on the SISST while the Control procedure was not. The Priming procedure induced more cognitive change when applied immediately after the group therapy.
CONCLUSION: An effect of priming was observed on social phobia related cognitions in the expected direction. This self administered addition to a therapy could be seen as an augmentation strategy
Research on Bovine Mastitis in Cuba. Review article
Mastitis is the main disease affecting dairy cattle. Reducing it is one of the most important tasks Cuban cattle raising has today. Hence, it is essential to know the national background, and research contribution. The literature shows that the frequency of mastitis caused by contagious pathogens has decreased; instead, minor pathogens are frequently the main cause. Research on the incidence of mastitis is recommended in the eastern part of the country. The economic losses associated to the disease, antimicrobial sensitivity of the microorganisms involved, and the differences between mechanical and manual milking must be further researched as well. Somatic cell count must also be extended to the rest of the country. Milking practices and hygiene should be improved. Increased production of medication to control mastitis, and the implementation of research on natural products and alternative treatments must be encouraged. A program to control bovine mastitis would be useful, based on recent research done in Cuba, including several products achieved in the country, using updated international methods to fight the disease
Plateau insulator transition in graphene
The quantum Hall effect in a single-layer graphene sample is studied in
strong magnetic fields up to 28 T. Our measurements reveal the existence of a
metal- insulator transition from filling factor to . The value
of the universal scaling exponent is found to be in graphene and
therefore in a truly two-dimensional system. This value of is in
agreement with the accepted universal value for the plateau-insulator
transitions in standard quasi two-dimensional electron and hole gases.Comment: 10 pages, 5 figure
THE APPLICATION OF DETREMDED FLUCTUATION ANALYSIS IN RUNNING AND ITS INTEGRATION INTO A REAL-TIME SYSTEM
Detrended fluctuation analysis (DFA) provides valuable information regarding both training and injury when applied to running time series. However, there is limited information when applied to recreational runners, or within a real-time environment. Firstly, DFA was applied to the stride time series of select training runs and competitive runs for recreational runners completing a half marathon and full marathon. Results indicate recreational runners maintain similar stride time dynamics in a half marathon, compared to training, however, stride time variability becomes increasingly deterministic during a marathon, compared to training. Secondly, we explore the implementation of DFA in a real-time system and provide evidence to support the use of DFA in running feedback
Planets in Stellar Clusters Extensive Search. I. Discovery of 47 Low-amplitude Variables in the Metal-rich Cluster NGC 6791 with Millimagnitude Image Subtraction Photometry
We have undertaken a long-term project, Planets in Stellar Clusters Extensive
Search (PISCES), to search for transiting planets in open clusters. As our
first target we have chosen NGC 6791 -- a very old, populous, metal rich
cluster. In this paper we present the results of a test observing run at the
FLWO 1.2 m telescope. Our primary goal is to demonstrate the feasibility of
obtaining the accuracy required for planetary transit detection using image
subtraction photometry on data collected with a 1 m class telescope. We present
a catalog of 62 variable stars, 47 of them newly discovered, most with low
amplitude variability. Among those there are several BY Dra type variables. We
have also observed outbursts in the cataclysmic variables B7 and B8 (Kaluzny et
al. 1997).Comment: 15 pages LaTeX, including 8 PostScript figures and 3 tables. More
discussion added on the implications for transit detection. Accepted for
publication in the Astronomical Journal. Version with full resolution figures
available through ftp at
ftp://cfa-ftp.harvard.edu/pub/bmochejs/PISCES/papers/1_N6791
The asteroseismic ground-based observational counterpart of CoRoT
We present different aspects of the ground-based observational counterpart of
the CoRoT satellite mission. We give an overview of the selected asteroseismic
targets, the numerous instruments and observatories involved, and the first
scientific results.Comment: 3 pages, 2 tables, 1 figure, to be published in the conference
proceedings 'Stellar Pulsation: Challenges for Theory and Observation' (31
May - 5 June, Santa Fe, New Mexico, US), publishers: American Institute of
Physic
Borromean Binding of Three or Four Bosons
We estimate the ratio of the critical coupling constants
and which are required to achieve binding of 2 or 3 bosons,
respectively, with a short-range interaction, and examine how this ratio
depends on the shape of the potential. Simple monotonous potentials give
. A wide repulsive core pushes this ratio close to R=1. On the
other hand, for an attractive well protected by an external repulsive barrier,
the ratio approaches the rigorous lower bound . We also present results
for N=4 bosons, sketch the extension to , and discuss various
consequences.Comment: 12 pages, RevTeX, 5 Figures in tex include
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