نتایج جستجو برای: 501
تعداد نتایج: 3855 فیلتر نتایج به سال:
Present experiment was undertaken to study the “Impact of yield attributes and yields groundnut varieties under different sowing windows in Western Maharashtra Plain Zone” at Department Agricultural Meteorology Farm, Centre Advanced Faculty Training (CAFT) Meteorology, College Agriculture, Pune, State (India). The laid out split plot design comprised four viz., V1: JL-501, V2: RHRG-6083 (Phule ...
Abstract Background The SARS-CoV-2 pandemic has had an unprecedented impact on healthcare systems, and cancer patients were amongst the most vulnerable. CONTACT is a national multidisciplinary study assessing of upon diagnostic treatment pathways among with pancreatic ductal adenocarcinoma (PDAC). Methods A novel, mixed prospective retrospective design, case identification both cohorts, trainee...
We consider the implications of the recent determination of the universal infrared background for the propagation of photons up to 20 TeV from the active galaxy Markarian 501 as observed by HEGRA. At 20 TeV the mean free path for photon-photon collisions on the infrared background would be much shorter than the distance to Markarian 501, implying absorption factors of the order of exp(−10), or ...
The CELESTE atmospheric Cherenkov detector ran until June 2004. It has observed the blazars Mrk 421, 1ES 1426+428 and Mrk 501. We significantly improved our understanding of the atmosphere using a LIDAR, and of the optical through-put of the detector using stellar photometry. The new data analysis provides better background rejection. We present our light curve for Mrk 421 for the 2002-2004 sea...
The recent detection of gamma radiation from Mkn 501 at energies as high as ∼ 25 TeV suggests stringent upper bounds on the diffuse, far infrared, extragalactic radiation density. The production of electron-positron pairs through photon-photon collisions would prevent gamma photons of substantially higher energies from reaching us across distances of order 100Mpc. However, coherently arriving T...
The BL Lac Object Mkn 501 was in a state of high activity in the TeV range in 1997. During this time Mkn 501 was observed by all Cherenkov-Telescopes of the HEGRA-Collaboration. Part of the data were also taken during moonshine thus providing a nearly continuous coverage for this object in the TeV-range. We have carried out a QPO analysis and found evidence for a 23 day periodicity. We applied ...
Zusammenfassung Dieser Bericht beschreibt die Zielsetzung und aktuelle Ergebnisse des DFG-Sonderforschungsbereichs 501 „Entwicklung großer Systeme mit generischen Methoden“. Dem SFB liegt ein experimenteller Ansatz zugrunde, bei dem die Einzelergebnisse der Teilprojekte in gemeinsamen kontrollierten Experimenten und prototypischen Anwendungsentwicklungen empirisch untersucht werden. Summary Thi...
We present long-term observations of several VHE (E > 100 GeV) blazars with VERITAS, together with contemporaneous Swift and RXTE Xray data. The observed targets include Mrk 421, Mrk 501, 1ES 2344+514. Strong flux and spectral variability is seen in Mrk 421 on nightly time-scales between January and June 2008, revealing a highly correlated X-ray to GeV/TeV connection. Modest Xray variability is...
The detection of gamma rays of energy greater than 300 GeV from the BL Lacertae object Mrk 501 demonstrates that extragalactic TeV emission is not unique to Mrk 421. During 66 hr of observations between 1995 March and July we measured an average flux of 8.1H 1.4 3 10 cm s above 300 GeV, a flux that is only 20% of the average Mrk 421 flux. The new gamma-ray source has not been reported by the Co...
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