23 research outputs found
Electron Population Aging Models for Wide-Angle Tails
Color-color diagrams have been useful in studying the spectral shapes in
radio galaxies. At the workshop we presented color-color diagrams for two
wide-angle tails, 1231+674 and 1433+553, and found that the standard aging
models do not adequately represent the observed data. Although the JP and KP
models can explain some of the observed points in the color-color diagram, they
do not account for those found near the power-law line. This difficulty may be
attributable to several causes. Spectral tomography has been previously used to
discern two separate electron populations in these sources. The combination
spectra from two such overlying components can easily resemble a range of
power-laws. In addition, any non-uniformity in the magnetic field strength can
also create a power-law-like spectrum. We will also discuss the effects that
angular resolution has on the shape of the spectrum.Comment: 4 pages, 1 figure, proceedings from 1999 'Life Cycles of Radio
Galaxies' workshop at STScI in Baltimore, M
A First Search for coincident Gravitational Waves and High Energy Neutrinos using LIGO, Virgo and ANTARES data from 2007
We present the results of the first search for gravitational wave bursts
associated with high energy neutrinos. Together, these messengers could reveal
new, hidden sources that are not observed by conventional photon astronomy,
particularly at high energy. Our search uses neutrinos detected by the
underwater neutrino telescope ANTARES in its 5 line configuration during the
period January - September 2007, which coincided with the fifth and first
science runs of LIGO and Virgo, respectively. The LIGO-Virgo data were analysed
for candidate gravitational-wave signals coincident in time and direction with
the neutrino events. No significant coincident events were observed. We place
limits on the density of joint high energy neutrino - gravitational wave
emission events in the local universe, and compare them with densities of
merger and core-collapse events.Comment: 19 pages, 8 figures, science summary page at
http://www.ligo.org/science/Publication-S5LV_ANTARES/index.php. Public access
area to figures, tables at
https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=p120000
Search for supersymmetry in events with photons and low missing transverse energy in pp collisions at âs=7 TeV
This is the pre-print version of the Article. The official published version can be accessed from the links below - Copyright @ 2013 Elsevier.Many models of new physics, including versions of supersymmetry (SUSY), predict production of events with low missing transverse energy, electroweak gauge bosons, and many energetic final-state particles. The stealth SUSY model yields this signature while conserving R-parity by means of a new hidden sector in which SUSY is approximately conserved. The results of a general search for new physics, with no requirement on missing transverse energy, in events with two photons and four or more hadronic jets are reported. The study is based on a sample of protonâproton collisions at âs=7 TeV corresponding to 4.96 fbâ1 of integrated luminosity collected with the CMS detector in 2011. Based on good agreement between the data and the standard model expectation, the data are used to determine model-independent cross-section limits and a limit on the squark mass in the framework of stealth SUSY. With this first study of its kind, squark masses less than 1430 GeV are excluded at the 95% confidence level.This study is supported by the BMWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); MEYS (Czech Republic); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON, RosAtom, RAS and RFBR (Russia); MSTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); ThEP, IPST and NECTEC (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA)
Uma sondagem via internet projetada para avaliar a vida diĂĄria dos idosos A web-based survey designed to assess older adults' daily lives
O declĂnio da saĂşde fĂsica e do funcionamento cognitivo, em decorrĂŞncia da idade, pode ter efeitos profundos na vida diĂĄria dos idosos, inclusive no desempenho de tarefas de autocuidado e na participação em atividades sociais. No entanto, pouco ainda se sabe sobre essa relação, devido Ă falta de medidas adequadas para uma avaliação diĂĄria dessa população. Este artigo apresenta um projeto piloto interdisciplinar que desenvolveu medidas diĂĄrias de saĂşde, funcionamento fĂsico, atividades de autocuidado e atividades sociais entre idosos. No estudo, 182 idosos (com idades entre 60 e 90 anos) participaram, atravĂŠs da internet, de uma breve (~15 minutos) pesquisa de base, e de avaliaçþes diĂĄrias, durante sete dias consecutivos. As medidas incluĂdas nesse estudo, e suas estatĂsticas descritivas, sĂŁo apresentadas neste trabalho. Na conclusĂŁo sĂŁo discutidas suas implicaçþes para pesquisas futuras, incluindo os desafios envolvidos no uso da internet para a coleta de dados de idosos.<br>Age-related declines in physical health and cognitive functioning may have profound effects on the daily lives of older adults, including influencing the performance of self-care tasks and engagement in social activities. However, little is known about these relationships due to the lack of appropriate daily assessment measures in this population. This article describes an interdisciplinary pilot study that developed daily measures of health, physical functioning, self-care activities, and social activities among older adults. In the study, 182 older adults (ages 60-90) completed a brief (~15 minutes) online baseline survey and online assessments once each day for seven consecutive days. The measures included in this study and their descriptive statistics are presented. Then the implications for future research, including the challenges of using web-based technology to gather survey data from older adults, are discussed