Next: The Corrected Gauss--Newton Up: Outline of the Previous: The Modified Gauss--Newton . This is identical to the modified Gauss--Newton method, except in the way that the Hessian matrix is approximated. ... At each iteration, a new estimation of the Hessian is obtained by adding a rank one or two correction matrix to the last estimate such that , the estimate of the Hessian matrix at the iteration, satisfies . ... After some iterations and around the optimum, converges to the Hessian. ...

Еще в разделе: (Показать все результаты (>1960) - www.sao.ru/ )

• Combining Methods
• The Corrected Gauss--Newton No Derivatives.

... Computing the true count rates for digital data. ... The following equation is used to find the count rate. x = ( raw counts / sample time ) . ... True count rates for digital data are corrected by using the first equation for a point source and the second for an extended source. a = ( y - pre_amp - darkrate ) / ( highvolt x pt_effic ) . ... True photocurrents (count rates for analog data) are corrected by the first equation for point sources and the second equation for extended sources. ...

Еще в разделе: (Показать все результаты (>12072) - www.stsci.edu/ )

• HSP Data Handbook
• Iterative Deconvolution
• A New Enhancement to the Iterative Method

... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...

Еще в разделе: (Показать все результаты (>1663) - www.adass.org/ )

• Non-parametric Algorithms in Data Reduction at RATAN-600

... 2 XPOS pixels x-coordinate of centroided source centre . ... 5 RATE counts/sec Total measured source counts (after background subtraction) within default source extraction aperture (r=12 un-binned pixels), divided by exposure time. ... 7 BACKGROUND_RATE counts/sec Total estimated background counts (scaled by area ratio, from the background annulus) within default source extraction aperture, divided by exposure time . ... Filter WHITE is set to 6 pixels. ... Bit set integer value reason region colour...

Еще в разделе: (Показать все результаты (>10814) - xmm.vilspa.esa.es/ )

• Comments on Individual Table Columns
• Algorithm

The pitch, roll, and focus errors of the telescope (measured and computed in AO9 survey and tilt sensor pitch,roll ) can be corrected by using the tiedowns. ... Tiedown positions to correct the pitch,roll, focus errors versus azimuth for za 2 through 20 degrees. ... The pitch, roll, and focus errors are plotted versus azimuth for za 1 to 20 degrees (the color changes every two degrees) . ... The pitch error is on the top and the roll error is on the bottom. ... The pitch and roll errors versus za. ...

Еще в разделе: (Показать все результаты (>2611) - www.naic.edu/ )

• optics
• pntErrVsPlatformMotion
• Vanvelck Correction

Next: Imaging - INVERT Up: Primary Beams and Mosaicing Previous: Summary of Imaging Strategies . For the joint approach, the reduction proceeds in a fashion which appears very similar to conventional observations. First a dirty image is formed (with associated point-spread function), and then a deconvolution algorithm is used to `clean' this dirty image. ... Imaging - INVERT . ... Next: Imaging - INVERT Up: Primary Beams and Mosaicing Previous: Summary of Imaging Strategies Miriad manager . ...

Еще в разделе: (Показать все результаты (>17180) - www.atnf.csiro.au/ )

• blcal
• koords: interactive co-ordinate fitting
• Time and FITS Files

... Posts tagged ?density estimation? ... Tags: catalog , convex hull peeling , density estimation , DR6 , massive data , multivariate analysis , nonparametric , SDSS , SQL , voronoi tessellation . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray . ... SAMSI AstroStat Prog. ...

Еще в разделе: (Показать все результаты (>3551) - hea-www.harvard.edu/ )

• Comments on: Is 3sigma the same as 3*1sigma? By: vlk By: hlee By: hlee
• The AstroStat Slog parameter estimation
• *calc_bary* - Computing Barycentric Corrections

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. ...

Еще в разделе: (Показать все результаты (>1284) - www.sai.msu.su/ )

• Further Information and Bibliography
• Oleg Bartunov's Home Page
• Authentication Options

ON THE IMPACT OF THE GALACTIC ABERRATION ON VLBI-DERIVED PRECESSION MODEL Z.M. MALKIN Pulkovo Observatory Pulkovskoe Ch. ... Corrections to adopted precession rate are usually computed from the linear trends in long-term time series of celestial pole offset (CPO), which are the differences between the measured and the theoretical coordinates of the celestial pole. ... CONCLUSIONS We have estimated the impact of GA on parameters of precession-nutation model derived from VLBI observations. ...

Еще в разделе: (Показать все результаты (>252) - www.gao.spb.ru/ )

... In brief: the frequency-dependent radiative transfer equation is solved for a dust under assumption of spherically-symmetric geometry for its distribution taking into account particle size distribution and quantum heating effects for the very small dust particles. ... Table: Model parameters for IRAS04296+3429. ... parameter . ... hot dust shell) . ... The best fit to the spectral energy distribution of IRAS04296 is shown by heavy solid line (see Table2 for details concerning parameters of the model...

Еще в разделе: (Показать все результаты (>733) - jet.sao.ru/ )

• harak_e
• Vitaly Goranskij, SAI/Moscow Univ.
• shmidt_e

ALMA | ... In this section, we explain why we need to correct phase fluctuations and ALMA's strategy to do this. Rapid fluctuations will be corrected with water vapour radiometers (WVRs). The Cavendish Astrophysics Group was also a leading contributor to the ALMA prototype WVRs, which were put through their paces in tests at the Submillimeter Array (SMA). ... The Cavendish Astrophysics Group in partnership with the Onsala Space Observatory built two prototype WVRs for the ALMA project. ...

Еще в разделе: (Показать все результаты (>1119) - www.mrao.cam.ac.uk/ )

• Computing atmospheric absorption with AATM Bojan Nikolic web pages (r. 329)
• Computing atmospheric absorption with AATM
• Configuring DIMMWIT Computers

Computer Ephemeris . ... Content of the Computer Ephemeris is the same as content of Soviet Astronomical Almanac (Ezhegodnik), but fully original algorithms and computer methods of calculations were used. Your requests for Computer Ephemeris for years before 2014 and your comments on its contents please direct to the author charlie@mail.univ.kiev.ua . ... Keywords: Computer Ephemerides, Computer Ephemeris, Computer Almanac, Computer Calendar. ...

Еще в разделе: (Показать все результаты (>236) - space.univ.kiev.ua/ )

• Contents of Computer Ephemeris for 2014 (DE200/LE200).
• Reduction quantities for Dynamical time. Explanations for Computer Ephemeris.
• Contents of Computer Ephemeris for 2015 (DE200/LE200).

Organiser: Xavier Caruso (CNRS, Poncelet Laboratory) . ... Isogenies are an essential tool in Elliptic Curves cryptography, where they are used in a wide variety of area: fast point counting, complex multiplication methods.. V lu's formulas give an efficient method for computing such isogenies, but there were no known formulas for computing isogenies for hyperelliptic curves of higher genus, except in particuliar cases. ... Poncelet Laboratory web page . ...

Еще в разделе: (Показать все результаты (>684) - www.mccme.ru/ )

• Christophe Pittet. MATHEMATICAL ASPECTS OF QUANTUM COMPUTATIONS (Spring 2011)
• Michael RaskinтА’s homepage
• Andrei Romashchenko. Selected papers.

grdgradient - Compute directional derivative or gradient from 2-D grd file representing z(x,y) grdgradient in _ grdfile -G out _ grdfile [ -A azim [/ azim2 ] ] [ -D [ c ][ o ][ n ] ] [ -L flag ] [ -M ] [ -N [ e ][ t ][ amp ][/ sigma [/ offset ]] ] [ -S slopefile ] [ -V ] grdgradient may be used to compute the directional derivative in a given direction ( -A ), or the direction ( -S ) [and the magnitude ( -D )] of the vector gradient of the data. ... If amp is not given, default amp = 1. ...

Еще в разделе: (Показать все результаты (>405) - xray.sai.msu.ru/ )

• Computer experiments in Astrophysics

... axis . ... tcc.axis.computeSlew Namespace Reference . ... Compute a slew to a given user-specified position, by iteration. ... Send the DRIFT command to all axes that are moving (whether you want to halt them or slew them) and update obj.actMount and obj.axisCmdState accordingly. ... If obj.axisCmdState==AxisState_Drifting and obj.targetMount[axis].isfinite(): compute a slew to the new position. ... object block: input: object block computed at approximately the current time (see above) output: . ...

Еще в разделе: (Показать все результаты (>644) - www.apo.nmsu.edu/ )

• lsst.coordConv: coordConv::Site Class Reference
• Astrophysical Research Consortium - Apache Point Observatory
• expurreq

... To introduce you to the Python programming language, and its Visual module (VPython), which allows 3D simulation. The computer labs are held in room BOZO 112, not in the usual physics lab. ... This lab will use the Python programming language. ... Click on the Windows button in the bottom left, select "Programs", then the "A-Z" list of programs. ... Later in the course you will need to write your own VPython programs for assessment - this lab is your chance to make sure you can do this. ...

Еще в разделе: (Показать все результаты (>506) - www.mso.anu.edu.au/ )

• Workshops and computer labs
• Computer room
• Bob Shobbrook dressed for a winters night at the control computer for the

The CDK20 South Planewave Instruments 20-inch (0.5-meter) f/6.8 corrected Dall Kirkham telescope is shown here with its optical designer Joe Haberman at Mt. Kent Observatory in Queensland, Australia, at the time of its installation in 2006. ... The corrected Dall Kirkham optical system provides a unique, wide, diffraction-limited, flat field ideal for CCD imaging and photometry. The telescopes at Mt. ... Instrumentation available for remote operation of the telescopes includes . ...

Еще в разделе: (Показать все результаты (>278) - www.astro.louisville.edu/ )

• Moore Observatory Remote/Robotic Telescope
• PEC Operation
• dec drive fixes

... Dr. Ravil Nazirov is the head of the workshop, and Andrew Ananjev is the secretary of the workshop. ... The workshop is used to be held in the last decade of the month, preferably on Tuesdays. ... The next session will take place October 29, 1996 . ... There is "CONPAS" mailing list which you can join to discuss issues of problem solving and to be automatically notified of important dates and decisions with respect to the coming sessions. ... Secretary of the Workshop: Andrew Ananjev . ...

Еще в разделе: (Показать все результаты (>457) - www.iki.rssi.ru/ )

• INTERBALL-TAIL KP changes
• Corrected Geomagnetic Coordinates
• Venera 15 & 16

... The tracking system works in micro-step regime with a computer step of correction = 0.003 arcsec per second of time and a maximum speed of correction up to 4.6 arcsec per second of time. ... The APD module was constructed for performing experiments of receiving of 2 Mbps signals from “ARTEMIS” using the Cassegrain focus of 0.7m telescope. ... GaAs PIN photo diode. ... Laser module with thermoelectric stabilisation of laser diode. ... Electronic module for turbulence compensation system . ...

Еще в разделе: (Показать все результаты (>160) - www.mao.kiev.ua/ )

... Step 1: The magnetic field line tracing from the satellite position up to magnetic equatorial plane using IGRF magnetic field model. Step 2: Tracing back from the point (produced on the Step 1) to the Ionosphere (by using only dipole magnetic field) . ... The magnetic field line tracing from the satellite position up to the Ionosphere (the stop trace altitude 110 km) using Main (dipole) + Extraterrestrial magnetic field model (for example, Tsyganenko [1987], or [1989], or [1990] ) . ...

Еще в разделе: (Показать все результаты (>670) - www.cosmos.ru/ )

• How it all began