... This poster shows that feed numbers are a major constraint in limiting the field of view. ... 3 Antenna Selection Flow chart Begin selection of SKA antenna Technology Front ends and beamformer within budget Yes ~35, 000 , 000 (fmax)2 feeds Elevation limit Phased arrays No Luneburg Lens Options Filled focal plane array within budget No Luneburg Lens fabrication within budget Yes Yes Full Field of View No mechanical steering 40, 000 , 000 to 80, 000 , 000 (fmax)2 feeds Field of ...

Еще в разделе: (Показать все результаты (>21312) - www.atnf.csiro.au/ )

• Bandpass and antenna gain calibration

... The usual maximum is due around August 12, 17h30m-20h00m UT, but Esko Lyytinen suggests we may encounter the 1610 Perseid trail earlier on August 12, around 9h00m UT (ЮЛo = 139ТА661). ... Image: Are we in for a Perseid spike? ... This is a nice automatic page made for IMO (the International Meteor Organisation ) by Geert Barensten, currently a PhD student at Armagh OBservatory. ... Monday, 10 August 2009 01:26 . International Year of Astronomy, Ireland National Node . ...

Еще в разделе: (Показать все результаты (>2759) - star.arm.ac.uk/ )

... 0 GBT PAF Demonstration System Single channel only represented 1 Element Patterns 1 Elevat ion ( Degrees ) -1 0.8 0.6 0 0.4 1 -1 0 1 Cross Elevat ion ( Degrees ) 0.2 0 1 Elevat ion ( Degrees ) 1 Elevat ion ( Degrees ) Elevat ion ( Degrees ) -1 0.8 0.6 0 0.4 1 -1 0 1 Cross Elevat ion ( Degrees ) 0.2 0 -1 0 1 Cross Elevat ion ( ...

Еще в разделе: (Показать все результаты (>5139) - www.naic.edu/ )

• http://www.naic.edu/~astro/chicago2/talks/Bower-ATA_SKA_Development_Facility.pdf
• http://www.naic.edu/alfa/galfa/meetings/3/galfa3_paulo-palfa.pdf
• http://www.naic.edu/~tghosh/ausac04/hsa.txt

In the PROJECT we are using the following peculiar . features of RATAN-600 . ... Brightness temperature sensitivity being equal to the antenna temperature sensitivity .. ... Receiver system .. ... Using aperture averaging effect. dual- beam and dual (multi-) frequency filtration, we demonstrated full filtration of the atmosphere noise down to the receiver noise at all scales of acoustics peaks ( Fig.1 , Fig 2 ). ... We select this frequency as the central one in our project. ... Antenna surface . ...

Еще в разделе: (Показать все результаты (>668) - jet.sao.ru/ )

• Feed cabin No.6
• Instrumentation

Some Effects of Earthquakes, Temperature, Wind Stor ms and Barometric Pressure on the Inter ferometer at Hanford Robert Schofield Masahiro Ito Rauha Rahkola Evan Mauceli Ray Frey David Strom Jim Brau University of Oregon Some Concerns With Low Frequency Influences · Loss of lock · Need for increased servo loop gain · May eat up actuator range · Possible increased background in the LIGO frequency band · Possible modulation of noise in the LIGO band Guralp ...

Еще в разделе: (Показать все результаты (>272) - zebu.uoregon.edu/ )

Next: Power of test Up: Basic principles of Previous: Test statistics . In principle, it is possible to compute a value of the statistic for a single frequency and to test its consistency with a random signal ( ). ... The factor N means that there is an increased probability of accepting a given value of the statistic as consistent with a random signal. ... In the command individual descriptions, we often refer to probability distributions of specific statistics. ...

Еще в разделе: (Показать все результаты (>1566) - www.sao.ru/ )

• Image Restoration
• Determination of the Dispersion Coefficients
• Possible Graphical Verifications

User Information Repor t UIR-1999-04 A Loose Screw on HST: Its Effect on HST Observing Programs J. Younger July 22, 1999 Concurrence: G. Miller ABSTRACT A hardware problem in the HST power system has caused overcharging of 2 of the 6 on-board batteries, which, if nothing was done, could result in battery overheating and possible failure. ... In order for HST to remain power positive, the maximum sustained sun to solar array normal angle (sun incidence angle) has been reduced from 25 to 20 degrees. ...

Еще в разделе: (Показать все результаты (>11691) - www.stsci.edu/ )

• Superconducting Confined Electron Devices for Possible Application as
• A Loose Screw on HST: Its Effect on HST Observing Programs
• Field-Of-Regard And Sky Coverage

... Astrophysics Group . ... VSA . ... CAT . ... The Very Small Array is a custom-built radio telescope (operating between 26-36 GHz), designed expressly to make high resolution observations of the cosmic microwave background (CMB) radiation on angular scales around and below one degree. ... The VSA has been operated in ?compact array? and ?extended array? configurations (see the technical description below) and data collected to achieve high sensitivity in both regimes have been analysed. ... 1.75 GHz)...

Еще в разделе: (Показать все результаты (>1808) - www.mrao.cam.ac.uk/ )

• High-frequency Radio Continuum Observations of Giant Radio Galaxies

... J5: Radio and Radar Studies of the Solar System. ... Analogously, the key idea of the USSR (United Solar System Radar) concept would be the thousandfold increase in sensitivity over existing radar astronomy facilities, and besides, only the tenfold increase in transmitting power and collecting areas of transmitting and receiving antennas is necessary for this purpose. ... So, let us try to imagine the scientific impact, which would provide this United Solar System Radar. ... 3)  Asteroid's moons; . ...

Еще в разделе: (Показать все результаты (>520) - www.cplire.ru/ )

• Getting Started in Actor Prolog. Oil Production.

... Likhachev, S., Ladygin, V., & Guirin, I. 2003, in ASP Conf. ... In VLBI, generalized Linear Multi-Frequency Imaging (MFI) consists of multi-frequency synthesis (MFS) and multi-frequency analysis (MFA) of the VLBI data obtained from observations on various frequencies. ... 2003). ... Likhachev, S. F., Ladygin, V. A., & Guirin, I. A. 2003, Lebedev Phys. Institute Preprint, 31, 30p. Likhachev, S. F.,Multi-Frequency Imaging for VLBI, Future Directions in High Resolution Astronomy, in print. ...

Еще в разделе: (Показать все результаты (>1427) - www.adass.org/ )

• Determination of the Permissible Solutions Area by Image Reconstruction from a
• ADASS 2002 Conference Proceedings
• The CARMA Data Viewer

... S/ 1981 S 15 174000 S/ 1981 S 16 220000 S/ 1981 S 17 231000 S/ 1981 S 18 185000 S/ 1981 S 19 186000 S/ 1995 S 1 137450 S/ 1995 S 2 139700 S/ 1995 S 3 141050 S/ 1995 S 4 146450 S/ 1995 S 5 140060 S/ 1995 S 6 139910 S/ 1995 S 7 139440 The first two groups are derived from analysis of Voyager 2 data reported in IAUC 6162 ; the third group is from HST observations during the May 1995 ring ... S/1995 S 3 orbits just outside the F ring and is apparently a shepherd moon . ... New Moons ....

Еще в разделе: (Показать все результаты (>686) - www.iki.rssi.ru/ )

• Some results from Intmins
• Global change [Oulu]
• Venera 15 & 16

... USSR Venus Orbiters . ... Each spacecraft consisted of a synthetic aperture radar (SAR) and a radio altimeter. ... The Venera 15 and 16 synthetic aperture radar (SAR) systems were identical, and were used to map the surface of Venus at a resolution of 1 to 2 kilometers (.6 to 1.2 miles) over a period of 8 months. ... The Venera 15 and 16 radar (radio) altimeter systems were identical, and were used to determine the topography of the surface of Venus from the north pole down to about 30њN latitude. ...

Еще в разделе: (Показать все результаты (>6262) - www.arcetri.astro.it/ )

• Lunar Prospector
• Virgo Group - Gravitational Wave basics
• possible bug in ipc/msg.c

... ON APPLICATION OF MULTI-FREQUENCY SYNTHESIS FOR RADIOASTRON MISSION. ... The first problem for RadioAstron mission for K-band will improved with using a new LNA / probably identical to . ... For RadioAstron mission it is proposed to operate one K-band circular polarized channel at fixed frequency 22.232 GHz. ... B. One circular polarization channel operates at frequency F0 and the opposite polarization channel operates at minimal frequency F-4. ... Signal and LO frequencies. ...

Еще в разделе: (Показать все результаты (>196) - www.asc.rssi.ru/ )

• Description of the RadioAstron project, english version
• Статья

... Methane Rain Possible on Titan . ... 2.08.2006 . ... Credit Copyright: Mark Garlick (Space-art.co.uk) Explanation: Might it rain cold methane on Saturn's Titan? Recent analyses of measurements taken by the Huygen's probe that landed on Titan in 2005 January indicate that the atmosphere is actually saturated with methane at a height of about 8 kilometers. ... 2005 2006 . ... Publications with keywords: methane - Titan - Saturn . Publications with words: methane - Titan - Saturn . ...

Еще в разделе: (Показать все результаты (>38358) - www.astronet.ru/ )

• Астронет > Methane Rain Possible on Titan
• APOD: 2005 August 28 ? Muon Wobble Possible Door to Supersymmetric Universe
• Muon Wobble Possible Door to Supersymmetric Universe

... 2006 August 2 . Methane Rain Possible on Titan . ... Explanation: Might it rain cold methane on Saturn's Titan? ... Combined with observations of a damp surface and lakes near the poles, some astrobiologists conclude that at least a methane drizzle is common on parts of Titan. ... The later scenario is depicted in the above drawing of Titan. ... About APOD | ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ... A service of: EUD at NASA / GSFC . ...

Еще в разделе: (Показать все результаты (>1599) - www.sai.msu.su/ )

• Saturn's Possible New Moons
• APOD: 2009 March 30 - Possible Mud Volcanoes on Mars
• APOD: January 20, 1999 - Possible Planets And Infrared Dust

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Antenna system . ... The Irkutsk incoherent scatter radar is one of the world's nine active radars which give the opportunity to investigate ionosphere by the incoherent scatter method. ... Antenna gain coefficient . ... Antenna . ... Two antennas . ... To get an idea what station "Dnepr" antenna system looks like, let us consider some of the radar views which are given by the photographs General view and Side view . ...

Еще в разделе: (Показать все результаты (>19) - rp.iszf.irk.ru/ )

• East Siberian Center of Earth Ionosphere Research. Chirp ionosonde.
• IS-radar

... 2 The amount of knowledge doubles every ~ 15 years !3 So if a physics degree took three years in 1900.. ... 4 But despite big increases in spending, how much students are learning isn't increasing !5 Net result, increasing specialization · Arguably this is slowing scientific progress !6 So is it possible to get knowledge into heads faster? ... 100 90 80 70 % Recalled 60 50 40 30 20 10 0 0 5 10 15 20 25 30 35 40 45 Time in lecture !9 Misconceptions · If you throw a ball across a room.. ...

Еще в разделе: (Показать все результаты (>608) - www.mso.anu.edu.au/ )

• Siding Spring Survey Survey/Media
• C/2006 P1 (McNaught)
• Unusual asteroids discoveries at e12

To initiate orbital motion click on any of the icons in tool bar with red sign + or – , permitting also to speed or to slow planet motion by repeated clicking on them. ... Selecting Orbits item in menu bar and by subsequent choosing corresponding items in drop-down menu one can also fulfil the above actions. ... To enter new initial epoch or to change list of minor or major planets which are shown in the picture, select Orbits in menu bar and then select Input data in drop-down menu. ...

Еще в разделе: (Показать все результаты (>483) - www.ipa.nw.ru/ )

• Conference WPLTN-2012 | Conference page
• Keywords_296

It could be that SETI signals have arrived at the Earth, but are lower then the noise level, and our receivers cannot detect them. ... Fig. ... It follows that two zones form around the star with civilization X: "Zone Yes", where its SETI signal can be detected, and "Zone No", where its signals are hidden by noise (Fig. ... In practice, it is more efficient to use a time factor, since the problem of SETI contact does not limit the duration of the signal element and semantic text. ...

Еще в разделе: (Показать все результаты (>360) - lnfm1.sai.msu.ru/ )

• Trudy GAISH, vol. LXV, 1996, Abstracts in English

... Наблюдения (Модераторы: tlgleonid , SP ) > . Possible GRB . ... Отчеты о наблюдениях . ... Наблюдения . ... Оффлайн . Сообщений: 2108 . Благодарностей: 21 . ... 16 Февраль 2011, 19:16:44 ? ... SUBJECT: OT 110215: possible GRB from 2MASS J00264184+8324093 . ... reflector and CCD the bright optical flash was detected starting on 2011 . ... Lightcurve: http://hea.iki.rssi.ru/~denis/J002641+832409-LC-Sergei.png . ... Записан . ... Сообщений: 3068 . ... Ответ #1 : 16 Февраль 2011, 19:21:11 ? ...

Еще в разделе: (Показать все результаты (>20) - www.astroclub.kiev.ua/ )