This group of four pages describes how the Arecibo 430 MHz radar makes simple measurements in the ionosphere. ... Radar Reflections From the Ionosphere . ... Or How are radio and TV stations like radars?) ... Consider two radio stations located on a mountain transmitting to a nearby city. ... A radar is like a radio station, but it has a receiver that picks up radio waves reflected from objects (targets). ... Although a radio station transmits continously, a radar can transmit short bursts of waves. ...

The APO 3.5-meter Remote Observing 2002 and Beyond . A Stray Light Analysis of the Apache Point Observatory 3.5-meter Telescope System . ... Telescope Control Computer (TCC) papers . MILT , the NSF proposal for the 3.5m telescope (no figures yet) . ... Collimation of the 3.5m telescope . ... Gives details of the coordinate conversions used to control the telescope, including the focal-plane conversions needed for positioning the rotator and guide camera and performing drift scans. ...

... If you have a program to convert data to MIDAS input format, fine. ... All you need to do is cannibalize the part of the existing program that reads the data, and add a short piece of code to re-format the data first as a flat ASCII file, one measurement per line; and then convert this to *.tbl format. ... It's just like the process of creating a program-star table. ... You may decide to write a short MIDAS script to apply your format-conversion program and the edited *.fmt file to each night's data...

The technical memorandum: Time and Time Interval Measurement with Application to Computer and Network Performance Evaluation (PostScript) describes a number of techniques for conducting experiments typical of computer network and transmission systems engineering. ... The usual data collected during a performance run of some experiment might include time offsets, time delays, frequency offsets and various error statistics. ...

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Astrophysics graduate student programs . ... Facilities . ATNF facilities . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

... HST . ... Data . ... HST Overview . Overview . ... Retrieving HST Data . ... This FORM is a quick tool for flux conversion between diverse unit systems. ... INPUT FLUX or MAGNITUDE UNITS CLEAR Jy W/m2/Hz W/m2/um W/cm2/um erg/cm2/s/Hz erg/cm2/s/A photons/m2/w/um photons/cm2/s/A AB magnitude magnitude V magnitude U magnitude B magnitude R magnitude I magnitude J magnitude H magnitude K magnitude L magnitude L1 magnitude M magnitude N magnitude Q . ... Enter the Input Flux or Magnitude Value : . ...

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TEST RESULTS WITH 2KX2K MCT ARRAYS Finger, G, Dorn, R.J., Mehrgan, H., Meyer, M., Moorwood A.F.M. and Stegmeier, J. European Southern Observatory Abstract: The performance of both an LPE 2Kx2K engineering grade and a science grade array have been evaluated. Both arrays have a cut-off wavelength of c=2.6 µm. At an operating temperature of 60 K, the dark current of the science grade array is 0.004 e/s. The peak quantum efficiency of the science grade array is 84.4%. ...

... Sky: . ... Temperature K . Dark current e - /s/pix . Emissivity . ... Adopted integration time s . ... Object signal e - /pix . Sky thermal signal e - /pix . Sky OH continuum signal e - /pix . Sky OH line signal e - /pix . Telescope thermal signal e - /pix . AOS thermal signal e - /pix . Dewar signal e - /pix . Dark signal e - /pix . Total signal e - /pix . ... This tool models the performance of the Gemini Near-infrared Integral-Field Spectrograph (NIFS) . ...

Next: Detection Efficiency Up: CCD Scientific Performance Previous: CCD Scientific Performance . The X-ray energy required to liberate a charge pair in a semiconductor is approximately an order of magnitude lower than in gas detectors, hence the potential spectroscopic advantage of CCD detectors. ... For a number of years, good scientific CCDs attained noise performance of electrons rms, but this limited the energy resolution for X-ray energies 3keV. ...

... CB3 0HA, U.K. The UCDs (Unified Content Descriptors) were first developed in the ESO/CDS data mining project, to describe precisely the contents of the individual fields (columns) of tables available from a data center. ... We present different applications of UCDs: selection of catalogues, based on their content; identification of catalogues having similar fields; automated data conversion allowing direct comparison of data in cross-identifications. ... a definition of the corresponding UCD; . ...

... LO frequencies were 1/2, 1/3 and 1/8 of signal frequency 75 GHz. ... But single junction SIS mixer has 30 dB input signal power range only [ll and it may decrease at high frequencies more than 200 GHz due to Josephson and 1 "switching" noise rise [2 e Our experiments show that subhurmonically pumped SIS mixer may have improved saturation power and reduced noise at high frequencies in some operation modes. ... 269 Fig.2 Quantum for LO and signal frequencies SIS operating mode. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... This is the first in a series of papers in which we describe and report the analysis of a large survey of Herbig Ae/Be stars in circular spectropolarimetry. Using the ESPaDOnS and Narval high-resolution spectropolarimeters at the Canada-France-Hawaii and Bernard Lyot Telescopes, respectively, we have acquired 132 circularly-polarised spectra of 70 Herbig Ae/Be stars and Herbig candidates. ...

The investigation of features of electromagnetic waves propagation, their generation and absorption in weakly inhomogeneous chiral media were started and the following results were obtained : . the governing equations to describe the electromagnetic waves interaction with inhomogeneous chiral plasmas were derived (together with N.S.Erokhin); . ... it was proven the 100 % hybrid mode conversion in the case of normal waves incidence upon inhomogeneous plasma (together with N.S.Erokhin); . ...

Композиты и наноструктуры COMPOSITES and NANOSTRUCTURES ?1 2010 CONTENS A.A. Kolchin, V.M. Kiiko, A.N. Tolstun, T.M. Ul'yanova, S.T. Mileiko Oxide/oxide composites with single crystalline fibres: high temperature creep .. ... L.M.Manocha,* Bharat Patel and S. Manocha Sic Fibers and composites by chemical vapor reaction (CVR) of host carbon materials .. ... SiC fibers made from isotropic carbon fibers have no crack and percentage SiC conversion is better than that from PAN based carbon fibers. ...

Модернизированные блоки преобразования частот (БПЧ) диапазонов волн 13 и 3.5 см со встроенными гетеродинами собраны в типовых термостатированных блоках, которые были разработаны для прежних высокочастотных блоков (БПТ) приемной системы радиотелескопа, не содержавших гетеродинов. ... Микросборка ШПК 3.5 см; . ... Сравнение параметров модернизированных БПЧ и штатных БПТ диапазонов волн 13 и 3.5 см (табл.) показывает, что БПЧ совместим с БПТ, но по ряду параметров разработанные блоки лучше прежних. ...

Astronomy Picture of the Day . ... 27.09.1998 . ... Einstein 's many visionary scientific contributions include the equivalence of mass and energy (E=mc^2), how the maximum speed limit of light affects measurements of time and space ( special relativity ), and a more accurate theory of gravity based on simple geometric concepts ( general relativity ). ... NASA Web Site Statements, Warnings, and Disclaimers . ... Publications with keywords: time - space . Publications with words: time - space . ...

... Phase Correction Algorithms | ... This page describes work undertaken at the Cavendish Astrophysics Group , developing phase correction algorithms and software for the Atacama Large Millimetre Array (ALMA). Without correction, phase fluctuations, mainly arising from the water content of the atmosphere, would limit ALMA's performance . ... The following people are currently involved in the phase calibration workpackage, based at the Cavendish Astrophysics Group in the University of Cambridge : . ...

spaceweb@oulu.fi - last update: 14 January 1999, 0950 UT (RR) . Term 'global change' is used to describe the changes of the large scale weather systems on Earth , and especially the surface temperature increase, by man-made increase of atmospheric CO 2 . ... It is the last point that is of importance for space physics, since it is possible that also the changes in Sun 's activity could be causing some changes in terrestrial climate. ... Space Physics Text Book of Oulu ...