... 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. ...

... 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 . ...

... Collective processes in plasmas with wave barriers . ... Нелинейное резонансное поглощение БМЗ-волны в поперечно-неоднородной плазме . ... Electromagnetic mode conversion by ultra-fast ionization of gases and condensed matter . ... A kinetic description of surface wave sustained discharge accounting for the nonlocal and collisionless electron dynamics . ... Ionization-induced langmuir wave excitation and spectrum conversion in high intensity laser pulses . ...

... The International Conference "Mode Conversion, Coherent Structures and Turbulence" will be held in the Space Research Institute of RAS during the period from 23 up to 25 November 2009. ... The international conference MSS-09 is organized by Space Research Institute with participation of the Russian Academy of Sciences, the Dynasty Foundation, the Russian foundation of fundamental researches, the European Geosciences Union, the Education and the Scientific Council on Nonlinear Dynamics of RAS. ...

... It has been largely superceded by MatWeb . Conversion Factors . Material properties . Physical constants . Astronomical constants . This table gives conversion factors to convert various units to their SI equivalents. ... The units are SI. This is a short list of physical constants in SI units. ... Boltzmann constant . ... Gas constant . ... Mass . ... Plank's . ... Radiation constant . ... This is a short list of astronomical constants in SI units. ... Sun . ...

Next: Image with sky grid Up: Celestial Coordinates from Image Previous: *skypix* conversion . ... logical . raw pixel coordinates of current image or image section . ... pixel coordinates of original image from which current image was derived ( logical if no blocking or sectioning have been performed) . ... sky coordinates . ... pixel coordinates on the tv ( SAOimage ) display. These will logical if an image section is specified as input to the display task. rsdc@cfa.harvard.edu . ...

... int iscntrl( int c) - True if c is a control character . int isdigit( int c) - True if c is a decimal digit . int isgraph( int c) - True if c is a graphical character . int islower( int c) - True if c is a lowercase letter . int isprint( int c) - True if c is a printable character . int ispunct ( int c) - True if c is a punctuation tolower(int c) - Convert c to lowercase. int toupper(int c) - Convert c to uppercase. ...

... All inputs for these functions and procedures can be arrays! . julian ( year _integer , month _integer , day _real ) Function; returns Julian day including fraction. Day can be fractional. ...

XEphem Forum Message . ... Post . ... Re: Catalog Conversion Utility . ... Post Message | ... the old versions and catalogs still exist on the german mirror: . ftp://iphcip1.physik.uni-mainz.de/pub/xephem_3.2/catalogs/ . An other xe to xe2 conversion utility is at: http://www.simg.de/xetoxe2.e.html (HP) . ... www.astronomy.net . About Astronomy Net | ... Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... Пширков М.С. Попов С.Б. A new method is suggested to search for axions constituting Dark Matter that utilizes observations of neutron stars (NS) in radio-frequency region. ... For example, if the coupling constant of photon-axion interaction is GeV and the density of DM axions is , then the flux density of excess signal for axions with rest mass of eV will be as large as several tenth of Jy at the frequency 240 MHz in the bandwidth 0.5 MHz. ...

Next: CONCLUSION Up: CHIRPLET TRANSFORM SUBSPACES Previous: Nondilational Chirplet Transform . Suppose we choose a windowed sinusoidal FM signal for our mother chirplet. Such a signal has a frequency that periodically rises and falls (much like the vibrato of musical instruments or the wail of a police siren). ... Figure 14 . ... Using the warbling mother chirplet, we also computed the ``dilation-dilation'' ( ) plane of the chirplet transform (Fig. 16 ) for the pendulum data. ...

... It is not always necessary to write a device driver for a device, especially in applications where no two applications will compete for the device. ... If your process is running as superuser (root), you can use the mmap() call to map some of your process memory to actual memory locations, by mmap() 'ing a section of /dev/mem. ... If you need to use cli() , you need a kernel-space driver, and a user-space driver will only cause grief as more and more Linux users use SMP machines. ...

... Virtual Observatory related tools use a new standard for data transfer called the VOTable format. ... We describe a streaming interface that can bridge the VOTable format, through a user friendly graphical interface, with the FITS and ASCII formats, which are commonly used by astronomers. ... This is a tool for converting ASCII or FITS files to VOTable format. ... A number of useful data processing, browsing and visualization tools are available to deal with data in the VOTable format. ...

Russian SHAREABLE DATA CENTER Institute of Solar-Terrestial Physics SB RAS . ... Chirp ionosonde main technical characteristics . ... Linear frequency modulated continuous signals sounding method is relatively simple and has wide application in various special-purpose systems. ... Chirp signals which are applying for ionosphere channel diagnostics usually have10KHz/s -- 1MHz/s. We must point out that under modulation speed increasing there is an increase in noise suppression and resolution power. ...

Radio Interferometry Principles . Radio Interferometry Signal Processing . ... A radio interferometer consists of a pair of directional antennas that are tuned to receive radio emissions from a source in a desired RF band. ... The antennas are pointed at the radio source of interest and are set up to receive the signal and process it into a form suitable for transmission to the correlator. ... In connected element interferometry, the digital signal goes directly to the correlator. ...

... dt=1; N_half =round((N_ft-1)/2); freq =(1: N_half )/ N_ft /dt; % plot half of the spectrum without multiplication by 2 subplot(5,1,1); plot ( freq , abs (Ftrns_signal1(2: N_half +1))); title('amplitude spectrum 1') xlabel(' frequency ') subplot(5,1,2); plot ( freq , abs (Ftrns_signal2(2: N_half +1))); title('amplitude spectrum 2') xlabel(' frequency ') subplot(5,1,3); plot ( freq , ...

... 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. ...

. Please enter the lightcurve FITS file name: . Lightcurve file: . Please note, the output dates are Barycentric-corrected Julian Dates expressed in Terrestial Time - BJD(TT). A similar FITS-to-ASCII lightcurve converter is available for SuperWASP data. If you have questions, bug reports or suggestions how to improve this service, please fell free to contact the author (Kirill Sokolovsky) via e-mail: kirx[at]scan.sai.msu.ru .

... We can help students grasp the significance of Hubble's extremely keen eye, and learn a bit about angles and math in the process, with the following in-class activity. ... Looking through binoculars or telescopes allows us to magnify a small section of the sky. To measure sizes or distances in that small section, astronomers divide a degree into 60 smaller pieces called arcminutes, and further subdivide minutes into 60 smaller sections called arcseconds. ... 30 feet = . ... 36 seconds . ...

An Anomalous SETI Signal . ... The bright colors on the blue background indicate that an anomalous signal was received here on Earth by a radio telescope involved in a Search for Extraterrestrial Intelligence (SETI). ... Time labels the vertical axis of the above plot , and frequency marks the horizontal axis. Although this strong signal was never positively identified, astronomers have identified in it many attributes characteristic of a man-made satellite in low Earth orbit. ...