Next: Test Results Up: Iterative/Recursive Deconvolution with Application Previous: A New Enhancement . This section presents the results of a mathematical analysis of the Iterative/Recursive Algorithm. ... This analysis is based on an iterative/recursive deblurring procedure with iterations at each of recursion levels. ... The deblurring algorithm at the lowest recursion level is the BID algorithm, the effect of which is given in Eq. ... Line 1 describes the BID algorithm. ...

... Positive iterative deconvolution is an algorithm that applies non-linear constraints, conserves energy, and delivers stable results at high noise-levels. This is also true for Richardson-Lucy like algorithms which follow a statistical approach to the deconvolution problem. ... All algorithms resolve the objects, as shown by the reconstructions by Richardson-Lucy in Figure 2 on the right, the algorithm by M?ller in Figure 3 on the left and positive iterative deconvolution in Figure 3 on the right. ...

... The procedure of radiometer signal integration can be considered as a sort of reducing dimension of the initial sampling space, where the samples are the result of analog-to-digital conversion. ... The probability distribution of the signal and spikes is completely known. ... The quality of the considered algorithm could be also illustrated by Figure 2 . ... One could see the considered adaptive algorithm is preferable even by low degree of compression, because all spikes have been depressed. ...

... Bojan Nikolic web pages home . Next: Fitting of models of radio spectra --.. ... I describe an approach to fitting and comparison of radio spectra based . on Bayesian analysis and realised using a new implementation of the . ... used maximum-likelihood fitting of radio spectra by allowing objective . ... implementation details of the computer code. ... overall approach described here may also be useful for analysis of other . ... Copyright 2012, Bojan Nikolic feedback welcome ...

Next: Multi-frequency deconvolution - MFCLEAN Up: Deconvolution with maximum entropy Previous: Deconvolution with maximum entropy . ... The quality of the maximum entropy solution can depend very strongly on the rms and flux parameters - these parameters should be set with some care, or some experimentation may be necessary. ... map, beam : As with CLEAN, you give task maxen a dirty image and a dirty beam. default : You also have the option of supplying a default image. ... MAXEN . ... Dirty image . ...

A completely new possibility of Fortran 90 is recursion. Note that it requires that you give a new property RESULT for the output variable in the function declaration. ... Here follows two examples, first recursive calculation of the factorial, then recursive calculations of the Fibonacci-numbers. ... The listings of the routines follow, the output variables are called FAC_RESULT and FIBO_RESULT , respectively. ... Not only functions but also subroutines can be recursive. ...

... The goal of the course is to give a complete mathematical description of Shor's algorithm which factors an N digit integer in O(NNlog(N)log(log(N))) steps on a quantum computer. ... Quantum computations and measurements, unitary operators and projectors. ... I will describe each~Z step in Shor's algorithm. ... 2) I will give the mathematical definitions of quantum-bit, quantum-memory, and quantum-computation, used in Shor's algorithm. ... This is the first step in Shor's algorithm. ...

Next: Summary and conclusions Up: Preliminary analysis of the Previous: Sky and redshift distribution . To get an estimate of the external accuracy of IPCS redshifts we compared our results for common galaxies with the redshifts from CfA catalog (Huchra et al. ... For 18 galaxies in common we have mean difference = -27 km s -1 with the error 16 km s -1 and the standard deviation = 64 km s -1 . This comparison indicates that most of IPCS redshifts have uncertainty less than 100 km s -1 . ...

Parameter Estimation Astro 193, Feb.25 Non-linear Models · Define 2 and determine the best-fit parameters · No simple analytical solution · Involves iterative minimization of 2 Methods · · · · Levenberg-Marquardt Gradient methods Simplex Monte Carlo Comparison of the Methods Levenberg-Marquardt · Calculates derivatives of a statistics function over the parameter space of the function . ... Niter = 7 Comparison of the Methods Simplex Intercept vs. ...

Hide Zen home . ... Index . ... Do we really need them for database indexing ? ... We need simple numbering scheme, so that for any given point we could easily calculate the number of "pixel", this is what HealPix provides and lacks HTM. ... During Rtree queries the number of index blocks read is several times greater than during Q3C queries. ... But in Q3C scheme, as we showed before, the circle is segmented, so we extract from the database only a few percents more data than occur in the circle. ...

... Main topics of investigation in that p eriod were comparison and combination of catalogues of radio source p ositions, analysis of VLBI EOP series, analysis of radio source p osition and zenith trop osphere delay time series. ... Julia Sokolova (100%) -- global data analysis for deriving radio source catalogues and p osition time series, comparison and combination of radio source catalogues, time series analysis, development of algorithms and software for CRF studies; 3. ... 2007, 474, No. ...

A NEW RECURSIVE SOLUTION OF THE PROBLEM OF SCATTERING OF ELECTROMAGNETIC RADIATION BY MULTI-LAYERED SPHEROIDAL PARTICLES V.G. Farafonov St.Petersburg State University of aerocosmic instrumentation, Abstract A new recursive algorithm of solution of the problem of scattering of an arbitrary polarized plane wave by multi-layered confocal spheroidal particles is constructed. ... In the case of multi-layered particle the potentials in each layer are represented by sums of two components. ...

... for the last iteration a larger grid is used in order to get an error ! estimate END modify/write the x-ray list end subroutine eposcorr subroutine find_offset x_shift= y_shift =0 LOOP over x_offset grid elements LOOP over y_offset grid elements call subroutine likelihood store likelihood in array IF likelihood best likelihood THEN update best likelihood , x_shift=x_offset , y_shift=y_offset END LOOP END LOOP xm = ym = 0 ...

... 1999: . The largest catalogue of distant powerful radio galaxies, detected with the RATAN-600, mapped in the radio range at the VLA, and photometered in 4 filters at the BTA 6-m telescope was compiled. The catalog allowed to estimate the color redshifts of all the objects and to estimate the ages of stellar systems of the host galaxies. ... The number of these rare and unusual objects is increased fivefold, and makes up fractions of percent among thousands of known dwarf galaxies. ...

THE PARAMETERS INVOLVED IN HAPKE'S MODEL FOR ESTIMATION OF THE COMPOSITION OF THE EJECTA LUNAR TERRAINS. ... In the previous papers we were estimated the surface roughness of the ejecta lunar terrains by means comparison of the local phase function and the average integrated lunar indicatrix. ... The Hapke's theoretical model of the lunar surface reflection. ... For THE PARAMETERS INVOLVED IN HAPKE'S MODEL: S.G. Pugacheva, V.V. Shevchenko a low-albedo lunar surface parameter Bo = 1. ...

Collection of the orbital elements | ... The errors of the spacecraft motion extrapolation outside the measuring time interval were estimated by using the comparison of SC positions calclulated by the forward integration ( extrapolation method) and backward integration ( interpolation methods). ... The character of these time shift of the ascending nodes ( D Tn) corresponds to the orbiting period errors, which arise during SC motion extrapolation outside the measuring intervals. ... INTERBALL mission ...

Some recent results ( see ) attracted the attentions of astronomers working on field which could benefits from photon counting techniques with high speed and spatial resolutions as adaptive optics. ... Fasti has been designed to be fast and largerly configurable. ... The data rate attined in the best case (30 Mhz), give no impossible load to the digital acquisition in the photon counting mode, since data are 1 bit only, they can be parallelized, giving a maximum speed of about 940.000 32 bit word/sec. ...

... For calculation of apparent place of some star there are two methods. ... The second method is to use formulae of this page together with information from 'Mean places ...' and 'Reduction quantities' pages. ... Here: ALPHAmean, MUalpha - mean right ascension and mean proper motion in right ascension of some star at mean epoch of the year, . DELTAmean, MUdelta - mean declination and mean proper motion in declination of some star at mean epoch of the year, . ...

... Comparison of a synthetic radio image and quaтАж . ... Title: Comparison of a synthetic radio image and quasar 3C 48 . Description: Comparison of a synthetic radio image (left panel) derived from the movie "Movie 1" and a VLBI image of the qusar 3C 48 (the second quasar discovered). ... Comparison of a synthetic radio image and quasar 3C 48 Comparison of a synthetic radio image (left panel) derived from the movie "Movie 1" and a VLBI image of the qusar 3C 48 (the second quasar discovered). ...

Here are six comparison images of the central nebula region from my 1998 AAS dissertation talk. ... Mid: Schmidt Bj (3600-5200 ) optical reflected starlight (folded scale). Bot: IRAS 100 ?m thermal emission (log scale). Right Side: Detailed HI 21cm line emission near the Pleiades, imaged by the 2 x 2 degree VLA-D survey (inset box); large-scale structure was mapped with the Green Bank 140-ft. telescope. ... These images compare the post-thesis extended VLA survey with other datasets. ...