The computed band passes. ... The interim correlator input is filtered by 8 analog filters (50 Mhz wide at the 260 Mhz IF... one for each sub correlator). ... For bandwidths of 25 Mhz and below the real data stream is digitally down converted to complex samples I, Q streams. ... The Top figure is the halfband filter bandpass computed from the filter coefficients. ... The computed filter has aliased power, extra IQ filtering, and two applications of the filter on the resulting real bandpass. ...

A spectrometer with 16 input channels (8 dual polarization), based on the ALMA Tunable Filter Board. ... A. Russo, G. Comoretto: Spettrometri a correlazione e a FFT per il radiotelescopio SRT , Arcetri technical report 1/2005 . G. Comoretto, A. D'Ambrosi, R. Nesti, A. Russo, F. Palagi: A modular multichannel spectrometer - design study Arcetri technical report 4/2006 . ... G. Comoretto, G. Tuccari: Reference design for the Digital BBC Architecture Arcetri technical report 2/2008 ...

... This noise can be reduced by replacing the pixels with an average of the surrounding values using a linear filter. ... The effects of applying linear filters to a CCD frame is shown in Figure . Figure: Different digital filters applied on a CCD image: (A) original, (B) block filter, (C) smooth filter, and (D) Laplacian filter. ... To remove stellar images from a picture of comet Halley, the results of applying different non--linear filters to the frame are given in Figure . ...

... Class . Use . ... ImageJ plugins that process an image may implement this interface. ... class . ... This plugin implements ImageJ's Analyze/Measure and Analyze/Set Measurements commands. class . ... This plugin implements ImageJ's Fill, Clear, Clear Outside and Draw commands. class . ... This plugin implements the Image/Show Info command. class . ... This plugin implements the Image/Lookup Tables/Apply LUT command. class . ... This plugin implements the Image/Rotate/Arbitrarily command. class . ...

... Обзор LPR фильтра. Впечатления от наблюдений с LPR фильтром. ... Характеристики цветных фильтров Baader-Planetarium . Мой перевод pdf- файла о фильтрах с сайта Baader-Planetarium (379 кб) . ...

... BBSYN is used to set the frequency for the BBC or digital filter assigned to each baseband channel (subband channel in EVLA terminology). ... All baseband channels assigned to the same physical BBC should be assigned the same frequency. ... For the VLBA DAR and MkIV systems, the baseband frequency must be set on even 10 kHz frequencies. ... The PFB personality of the RDBE, ( DBE = RDBE_PFB ) has rather rigid baseband frequency options. ... Argument: Up to 16 frequencies in MHz. ...

... example, note below the dramatic speedup in searching a 1 Gb file using an AND filter, even when one of the columns (pha) has no index : time fundisp \ huge.fits'[idx_activate=0,idx_debug=1,pha= 2348 4000 4000 1]' \ x y pha x y pha ---------- ----------- ---------- 3999.48 4000.47 2348 3999.48 4000.47 2348 3999.48 4000.47 2348 3999.48 4000.47 2348 3999.48 4000.47 2348 ... Currently, indexed filtering only works with FITS binary tables and raw event files. ...

neutral density filters . broad band filters (bandpass > 30nm) . ... Takes 50-mm square filters, up to 8-mm in thickness. Note: These filters are mounted in the slit mask wheel. ... The slit mask wheel pull down menu in the Remark DIS interface lists the filters and slits currently mounted in the wheel in the spectrograph. ... Will probably be able to accommodate 50-mm square filters, up to 20-mm in thickness (?) ... Takes 1.40-inch square filters, up to 0.315-inch in thickness. ...

Optical Filters . WFPC2 features two solar-blind Wood's filters, for FUV (<2000 ) imaging. ... These Wood's filters have a broad bandpass from 1200 to 2100 with visible-light transmission lower than 10^-8. ... In such cases, a Wood's filter (or "solar blind" detector as on STIS) is essential for FUV imaging so that the visible light leak does not dominate the observation. ... Two similar Wood's filters (F160AW and F160BW) were mounted in SOFA wheel 1 to provide some redundancy. ...

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... Tonight's Sky . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Filtered solar views . ... With the range of filters and telescopes available for solar observing these days, we have never had a better opportunity to safely observe the Sun from the comfort of our backyards. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Meta Index / Home Page / Description / Example expressions These sample boolean expressions demonstrate the filtering of an event list table with columns RAWX , RAWY , PHA , PATTERNID , CCDID , PHASE , TIME , and FLAG : . ... select all events with X coordinates greater than or equal to 100; exclude the 10th event anyway . ... select all events with PATTERNID equal to 4 . ... select events which have been selected in the previous selection run and have PHA values greater than or equal to 10 . ...

vlf.tab . vlf.txt . 00123a3a.dat 00136a3a.dat 00305a3a.dat 00371a3a.dat 00384a3a.dat 00463a3a.dat 00490a3a.dat 00581a3a.dat 00642a3a.dat 00647a3a.dat 00655a3a.dat 00668a3a.dat 00671a3a.dat ...

... Meade Series 4000 Nebular Filters incorporate the very latest in interference coatings technology. ... Technical Basis of the Meade Broadband Nebular Filter: As shown in the transmission graph below, the Meade Broadband Nebular Filter strongly rejects the light of sodium- and mercury-vapor lights as well as natural airglow and auroral emissions. ... Meade Series 4000 Narrowband Nebular Filters . ... Meade Series 4000 Oxygen-III Nebular Filters . ... Meade Series 4000 Photo-Visual Color Filters . ...

A computer controlled low light photometer for nightglow observations. Hardware units of portable photometer for low light measurements, especially night glow emission is described. ... Interface card contain three channels of 24 bit counter, 4 channels of 12 bit ADC and the buffer bus for the controlled motors of the altazimuthal fork mounting and filters wheel, the position encoders. ... Where N( ) is output signal photometer generated input light flux F( l ) . ... PMT # . 599 . ...

... Parameters . Filters . ... Direct images . ... The SCORPIO-2 project: . Spectral Camera with Optical Reducer for Photometric and Interferometric Observations - 2 . The broad-band glass filters made in SAO RAS are used for the observation in the Johnson-Cousins (UBVRI) photometric system in the direct images mode. The glass filters transmission curves are shown by solid line. ... The filters transmission curves of the `comets' filters measured with the SCORPIO-2 in the F/4 beam. ...

... Version 2.0 of the CFITSIO subroutine interface for reading and writing FITS format data files is now available from the HEASARC web site. Some of the major new features in this version are the ability to read FITS files over the network, support for reading IRAF format images, and options for filtering the input file at run time. CFITSIO is a software library that contains both C and Fortran-callable interface routines for reading and writing data files in FITS format. ...

... I have compiled a list of throughput filter curves from a variety of telescopes, instruments, and surveys. Click on the name of the filter to download it. The first line of each filter is the zeropoint for that filter. If the filter is in the AB system, it is listed as 0.0 (or in otherwords -48.55). ... Filter . Effective Wavelength . ... A_V . ... 0.987 . ... 0.050 . ...

Laboratory work N7 Low-pass filtering. 1) Generate the signal with two periodic components and high-frequency noise. ... 2) Perform it's filtering with Panteleev filter 0 - h(t) = e 22 0 |t| 2 0 t 0 |t| cos + sin 2 2 , where 0 is a parameter. The frequency response of the Panteleev filter is ^ h( ) = 4 0 . 4 0 + 4 Select the cut-off frequency (by varying 0 ) for filtering out high-frequency periodic component and noise. 3) Plot the initial and filtered signal. ...

extract equivalent widths ew(t) from 2d spectrum f(w,t) compute equivalent widths from normalized spectra smooth a function with a gaussian filter compute a gaussian filter for applying to a FFT calulate moments of a line profile compute periodogram dft(frq) from a light curve f(t). Use CLEAN if clean_mode = 1. fit a parabola fit(xv) to an arbitrary function yv(xv) evaluates a sine function on a given x-array