Next: Frequency Handling Up: Computation Previous: Self-Calibrating with Multiple Models . The biggest difference between selfcal and gpscal is in the handling of polarisation and dual feeds. Though selfcal can handle multiple pointings and frequency ranges, it assumes that the antenna gain is independent of feed (i.e. the X and Y gains are the same). ... Unlike selfcal , gpscal cannot take models from multiple pointings or from different frequency ranges. ...

... Frequency: 30 GHz Bandwidth: 20% Edge taper: 30dB@22° Cross-polar level: <-25 dB Return loss: >25 dB Features: 1. ... Compactness Phase centre near to the radiating aperture Noticeable secondary lobe level in the upper frequency band Noticeable pattern differences over the band Related notes: 1. Improved throat features for machine tool 2. ...

. ATMOSPHERIC INFLUENCE ON THE DIFFERENT RADIO-ENGINEERING . SYSTEM FUNCTIONING . The calculations of the atmospheric impact on terrestrial and satellite communication links with frequencies above 10 GHz using the ITU-R data bank. The correction of the Earth cover optical images obtained from the satellite/ . The Earth atmospheric influence on the radiowave propagation parameters in wide frequency range (from SLF to UV). Contact e-mail: . Pozhidayev Victor, Ph.D - vic@cplire.ru . © IRE RAS 1996-20 11

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. ...

Describes the differences between Funtools/ds9 regions and the old IRAF/PROS regions. We have tried to make Funtools regions compatible with their predecessor, IRAF/PROS regions. For simple regions and simple boolean algebra between regions, there should be no difference between the two implementations. ... The PANDA region has replaced the old PROS syntax in which a PIE accelerator was combined with an ANNULUS accelerator using AND . ... Go to Funtools Help Index ...

... The results of long-term monitoring of Gigahertz-Peaked Spectrum sources were found the statistically significant differences (0.05 significance level) in the high-frequency spectral index distribution between subgroups of galaxies and quasars. ... This can mean that the electron energy distribution for GPS galaxies is steeper than for GPS quasars. ... The first area corresponds to GPS-quasars that have statistically larger value of redfhift, second area corresponds to GPS-galaxies. ...

... Energy Levels . ... Examining the Balmer formula and also the Ritz combination principle (further below), Bohr suggested that atoms could exist (even briefly) only in certain energy levels , and light was emitted only when an atom descended from some higher energy level to a lower one. ... When an electron descends from a higher energy (large n) to a lower one (smaller n), by Balmer's formula together with Einstein's, the energy of the photon emitted was exactly the amount of energy given up: . ...

Text of report The subject if our report is the influence of the structure and physics of the uppermost superadaibatic layers on the oscillational spectrum of p-modes. ... In our report we will try to use a most simple representation of the spectrum, plotting the differences between theoretical (that is models') and observational frequencies against a frequency. ... It allow us to focused on the effects of the uppermost layers and ignore possible sophistications from effect of more deeper layers. ...

... Tonight's Sky . ... The Magazine . ... Observing . ... An artificial comet holds secrets to Earths life . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... What is the difference between comets and asteroids? ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

home publications > mercury . SEARCH ASP SITE: Match ALL words Match ANY word . ... ASP Conference Series . ... Taking Steps to Make a Difference . ... The test measures students' basic knowledge regarding Earth, physical and life sciences, and basic scientific principles. ... Fourth-grade: sixty-eight per cent achieved at or above the basic level. ... Eighth-grade: fifty-nine per cent scored at or above the basic level. ... Twelfth-grade: fifty-four per cent performed at or above the basic level. ...

... Therefore, to measure the complex degree of coherence between the two beams, also called the visibility (of the fringes), it is necessary to vary the optical path length difference (OPD) between the telescopes and the beam combiner from its nominal value (i.e. the geometric delay) which combines the light within their coherence length. ... To compute the visibility in a band pass, or the broad band "white light" visibility, we integrate over k . ...

Multi-Frequency Synthesis in K-band . The Multi-Frequency Synthesis (MFS) permits to realize a good quality imaging of the continuum radio sources in short time. ... The RadioAstron mission will operate one K-band circular polarized channel at fixed frequency 22,232 GHz. ... In general one K-band RadioAstron channel with fixed frequency will be unchanging and compatible with all the ground radio telescopes. ... Progress of the RadioAstron Project in Pictures . ...

Special Astrophysical Observatory, Nizhnij Arkhyz, 369167 Russia pea@sao.ru Magnitude Magnitude Differences measurements for speckle Differences measurements for speckle Inter ferometric binaries binaries Inter ferometric E. A. Pluzhnik A method of magnitude differences measurements for speckle interferometric binary stars is presented. The method is based on standard power spectrum analysis of speckle series without correction speckle interferometric transfer function. ...

... ARC 3.5m | Weather Closure Conditions . The enclosure will be closed by the Observing Specialist under the following conditions. ... This policy will be consulted whenever there are questions or disagreements concerning closure of the APO 3.5-meter telescope due to hazardous conditions or situations, at times when telescope operations are being overseen by an APO Observing Specialist. ... the on-duty Observing Specialist has full responsibility, and sole authority, to make this decision. ...

... We reconsider the problem of the difference between the abundances of carbon and oxygen in galactic planetary nebulae (PN) derived from the intensities of the recombination and collisionally excited lines. ... The intensities of the forbidden [OIII] lines, the CII, CIII and CIV recombination lines and the CIII]$\,\lambda\,$1909 UV intercombination doublet for different values of the mean electron temperature $T_0$ in PNe and the {\em rms} temperature variation $\mbox{\bm $t^2$}$, are calculated. ...

... St Petersburg 23, September 2014 1 Motivation · Origin of Martian moons? ... Considered error sources: ­ Phobos a priori ephemerides; ­ Phobos a priori GM value; ­ measurements noise; ­ different strategies; · Methods: ­ real data analysis; ­ simulations. ... St Petersburg 23, September 2014 8 Simulations: sensitivity of the measurements to the a priori GM value Simulations: zero noise+ IMCCE a priori ephemerides +GMPH = 7.16 * 105 m3/sec2. ... St Petersburg 23, September 2014 14 Thank you! ...

Peremennye Zvezdy ( Variable Stars ) 32 , No. ... Photometric CCD observations of the pre-main-sequence Herbig Ae star WW Vul on separate nights during 2007-2011 are presented. ... Relative magnitudes of WW Vul were measured with respect of the comparison star. ... From top to bottom: (a) one night of observations of WW Vul: differences variable - comparison star and comparison star - check star; (b) de-trended light curve; (c) phase curve for the season 2011 with the first frequency, 9.34 d . ...

... Bad Astronomy . ... Bitesize Astronomy . ... Mad Science . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... Area of science: Astronomy . ... Even if we know that the gravitationnal force of the sun is greater than the gravitationnal force of the moon, we know that tides are more influenced by the moon than the sun.Why? The best answer I got is that it's just because the moon is closer to earth than the sun, but how does that make a difference? ... 2008 Phil Plait. ...

Astronotes Armagh Planetarium's Stellar Blog! ... Armagh Planetarium . ... Space Flight . ... Godspeed John Glenn": A reminder of the days when NASA could send astronauts into orbit. Image credit: NASA) . Watched by a TV audience of 100 million, the Atlas functioned beautifully and Glenn became the first American (and third human; Gagarin and Titov preceded him) in orbit. ... No female astronaut flew on a NASA mission until Sally Ride?s flight in 1983, by then Glenn had changed his position. ...

... We point out differences between (intensity and velocity) power spectra of network and internet work regions and argue that the behaviour resembles that of CaII power spectra. No Significant phase differences are found between the intensities of both lines. ... Intensity power spectra of CII are affected at higher frequencies by streams of emitting structures. ... A cookbook formalism is presented to derive confidence levels for power, phase, gain and coherency spectra. ...