نتایج جستجو برای: telescope

تعداد نتایج: 21273  

2009
Antoine Kouchner

Several projects are concentrating their efforts on opening the high energy neutrino window on the Universe with km-scale detectors. The detection principle relies on the observation, using photomultipliers, of the Cherenkov light emitted by charged leptons induced by neutrino interactions in the surrounding detector medium. In the Northern hemisphere, while the pioneering Baikal telescope, has...

2006
Weidong Cui Vern Paxson Nicholas C. Weaver

A key tool for detecting new worm outbreaks in their early stages is the honeyfarm, a large collection of honeypots fed Internet traffic by a “network telescope”. However, actual operation of a honeyfarm in a large-scale environment presents difficult scaling challenges. We discuss the structure and implementation of GQ, a honeyfarm system we built to analyze in real-time the scanning probes se...

2009
Brian Humensky

The study of supernova remnants and pulsar wind nebulae was one of the Key Science Projects for the first two years of VERITAS observations. VERITAS is an array of four imaging Cherenkov telescopes located at the Whipple Observatory in southern Arizona. Supernova remnants are widely considered to be the strongest candidate for the source of cosmic rays below the knee at around 10 eV. Pulsar win...

2007
Russell Cannon Keith Taylor

Construction of thèTwo-degree Field' (2dF) instrument on the Anglo-Australian Telescope (AAT) is now virtually complete and commissioning is well underway. The key components are described. Several recent milestones are reported, including the rst scientiic results. Future prospects and plans are discussed.

2011
GOULVEN GUILLARD

Amongst the atmospheric muons recorded by neutrino telescopes are muons produced by the interaction of cosmic gamma rays with the Earth’s atmosphere. Although they are not numerous, it has been suggested that such muons could be distinguished by neutrino telescopes from the isotropic background by correlating their direction with known sources of gamma rays. The ANTARES neutrino telescope is ta...

2009
Anthony M Brown

Completed in May 2008, the ANTARES neutrino telescope is located 40 km off the coast of Toulon, at a depth of about 2500 m. The telescope consists of 12 detector lines housing a total of 884 optical modules. Each line is anchored to the seabed and pulled taught by the buoyancy of the individual optical modules and a top buoy. Due to the fluid nature of the sea-water detecting medium and the fle...

2002

Recent results obtained with the HEGRA system of imaging Cherenkov telescopes on the TeV emission of the Blazars Mkn 421 (z = 0.030), 1ES1959+650 (z = 0.047), and H1426+428 (z = 0.129) are reported. For Mkn 421, a close connection of the average flux level and spectral shape has been observed during the periods of increased activity in the years 2000 and 2001. Simultaneously taken data with the...

2012
Guido Gioioso Gionata Salvietti Monica Malvezzi Domenico Prattichizzo

Robotic hands differ in kinematics, dynamics, programming, control and sensing frameworks. Borrowing the terminology from software engineering, there is a need for middleware solutions to control the robotic hands independently from their specific structure, and focusing only on the task. Results in neuroscience concerning the synergistic organization of the human hand, are the theoretical foun...

2002
J. Najita

We describe some of the science programs that drive the need for the next generation ground-based OIR telescope. The programs are chosen to illustrate the power of such a telescope to enable new kinds of science via combinations of sensitivity, field-of-view, wavelength coverage, and spectral resolution.

2007
M. Clampin M. Rieke G. Rieke R. Doyon J. Krist

2. JWST Instrument Complement JWST is not primarily designed to conduct coronagraphic observations. It’s segmented mirror telescope architecture, as shown in Figure 1, generates considerable additional diffraction structure in the telescope’s point spread function compared to that of a monolithic mirror. The JWST project has set a performance requirement of diffraction limited imaging at 2 μm. ...

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