... Near, far field and the sky ovverlap at 100 km . Relative strengths of linefeed/yagi sidelobe detections . ... 18 Amin . ... Diameter=(K*lambda)/hpbw (where k depends on the edge taper .. typically k=1.2) The hpbws are different for the linefeed and yagi so their illumination patterns are different. ... At this height, the linefeed is still in the near field while the yagi is in the far field. The angles and distances of the two beams at 100 km are shown below (assuming the far field.. ...

... The visible power a source emits in all directions is measured in lumens. ... Solid Angle- . ... The solid angle of a light cone is the projected area of the cone divided by the total surface area of the sphere. A solid angle is measured in steradians, where 1 steradian corresponds to the solid angle su btended by a cone of unit slant height and unit projected area. ... Luminous intensity is the flow of luminous energy, or lumens, per steradian. ... This is the rate of flow (lumens) per unit area. ...

... Analysis of the UVIS03 data show that the gain ratios, relative to the nominal 1.5 , are 1.01-1.04, 2.09-2.15, and 4.28-4.39 at a detector temperature of -82C. A check of the absolute gain of the nominal 1.5 setting was performed using flatfields from the linearity (UVIS05) test; gains were measured at 1.53, 1.52, 1.56, and 1.55, with errors 0.01 , for quadrants A,B,C, and D. Introduction The purpose of the ... Gain ratios for the four quadrants, relative to gain 1.5. ...

Start Data Acquisition - Selected Wavelengths - 22/Apr/2014 16:06:46.063 Observation Type - Target Images - 22/Apr/2014 16:06:46.088 22/Apr/2014 16:06:48.128 Begin Iteration #1 of 2 - Number of Frames : 17 - 22/Apr/2014 16:06:48.144 Filter : 6563 (Position 3) | ... Acquisition Time : 22/Apr/2014 16:06:48.273 | ... ExpTime (sec) : 0.030 | Stokes : I Filter : 6563 (Position 3) | ... Stokes : I Begin Iteration #2 of 2 - Number of Frames : 17 - 22/Apr/2014 16:06:50.942 Filter : 6563 (Position 3) | ...

Pre-launch timing calibration standards Eckhard Kendziorra IAA TЭbingen Crab pulse profile measured with EPIC pn Lessons learned from XMM-Newton Relative timing of EPIC pn verified pre-launch (but only for relatively short intervals, relative timing verified shortly after launch but second jumps of experiment clock only detected after launch Absolute timing for EPIC pn NOT verified ...

... Impedance . Electrical impedance, or simply impedance, describes a measure of opposition to a sinusoidal alternating current (AC). Electrical impedance extends the concept of resistance to AC circuits, describing not only the relative amplitudes of the voltage and current, but also the relative phases. ... Resistance is the real part of impedance; a device with a purely resistive impedance exhibits no phase shift between the voltage and current. ...

... Mindful of these biases, I can now explore the relations between the measured rotation periods and various other observables. The hypothesis behind monitoring stellar variability is that active stars have asymmetric spot distributions on their photospheres. ... They found that only stars with rotation periods greater than seven days show variations greater than 0.4 magnitudes at I. Bouvier et al . ... 1993a) demonstrated a relation between X--ray flux and spectral type in ZAMS stars. ...

. You can define a file or directory by its location in relation to your current directory . The pathname is given as / (slash) separated list of the directories on the route to the file (or directory) from your current directory. A .. (dot dot) is used to represent the directory immediately above the current directory. In all shells except the Bourne shell, the ~ (tilde) character can be used as shorthand for the full pathname to your home directory. Examples . Did You Know? .

... A three-cell test section roughly representative of the primary mirror was provided for this test by the Steward Mirror Lab. ... Additionally, the tests are intended to determine relative airflow vs. pressure drop characteristics for each of the air flow patterns so the results can be evaluated both as a function of flow rate and of pressure drop along the flow path. ... The bottom (top as installed) was cut out so it could close the chamber for heating and be removed for the cooling tests. ...

... A document window is shown, with 8 lines (numbered 1 to 8), each 24px high. The text of the "outer" box (at the end of line 1, halfway into line 2, and halfway into line 3) is shifted upward 12px. The text of the "inner" box, thought shifted upward as well, has been relatively positioned so that it lies in its normal flow position at the end of line 2. ... The lines, as they appear in the image, contain: Start 1 Beginning of body contents. 2 of outer contents. Inner contents. ...

We investigate the relative importance of starbursts and active galactic nuclei (AGN) in nuclear activities of ultraluminous infrared galaxies (ULIRGs) based on chemodynamical simulations combined with spectrophotometric synthesis codes. We numerically investigate both the gas accretion rates (ARs; m acc ) on to supermassive black holes (SMBHs) and the star formation rates (SFRs; m sf ) in ULIRGs formed by gas-rich galaxy mergers and thereby discuss what powers ULIRGs. ...

Electron-Bombarded, Back-Illuminated CCD Sensors . For Low-Light-Level Imaging Applications . ... Significantly higher performance, reduced form factor, low-light-level surveillance cameras relative to present state of the art are critical for many commercial and military applications. ... A design and simulated performance of a video rate 2/3 inch, back-illuminated, electron bombarded CCD currently under development for low light imaging applications is also described. ...

Next: ST-ECF Grism Spectrum Software Up: NICMOS Data Calibration and Previous: Photometric Performance of NICMOS . ... Wavelength Calibration of NICMOS Grisms . ... This article describes the wavelength and throughput calibration of the grisms and discusses the photometric performance of the NICMOS grism mode. ... The resolution of the first order spectra on all grisms is about 200 per pixel. ... Spectra were extracted for bright objects with both first and second order spectra on single grism images. ...

UFO Forum Message . Forums: . ... Post . ... It Really Is Relative . ... Post Message | ... If you are on the Earth the moon does not rotate around its own axis. ... www.astronomy.net . About Astronomy Net | Advertise on Astronomy Net | ... Unless otherwise specified, web site content Copyright 1994-2016 John Huggins All Rights Reserved . Forum posts are Copyright their authors as specified in the heading above the post. "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

... In Spiral . Between spiral . ... Center of vortices . ... to density exterema . ...

The ESA/ESO Astronomy Exercise Series 2 . The Distance to Messier 100 as Determined by Cepheid Variable Stars . ... The small variations in distance to the individual Cepheid variable stars in the Cloud are negligible compared with the much larger distance to the SMC. ... In this way Cepheid variable stars can be used as one of the 'standard candles' in the Universe that act either as distance indicators themselves or can be used to calibrate (or set the zero point for) other distance indicators. ...

... Optical constants of Fe 2 O 3 in the infrared spectral region. ... Optical constants: . amorphous Fe 2 O 3 . ... The Reflectance of polarized radiation at the incidence angle 12 deg was measured in the range from 1400 to 200 cm -1 for monocrystalline hematite (alpha-Fe 2 O 3 ) and amorphous Fe 2 O 3 samples. Special technique applied allowed to reduce the relative errors downto 1% for the reflectance values of 0.005-0.8. The optical constants were obtained by the Kramers-Kronig method. ...

... Electric field is a potential heat source for ionospheric particles (Rees, 1989). It is due to the fact that, under the action of an electric field, charged particles drift relative to one another and relative to neutral particles. ... This is called frictional heating. ... However, the effect of frictional/Joule heating of neutrals in the auroral electrojet region can lead to upward neutral wind in a region of high electron densities and strong electric fields (Winser et. al., ...

... The experience of determination of the link between radio sources and dynamical reference frames is presented. To obtain this connection we used a series of very long baseline interferometry (VLBI) observations of the spacecraft Phobos-2 and angularly nearby quasars. ... The dynamical reference frame is determined by equator and equinox of these ephemerides. ... References . ... The relative orientation of the radio and dynamical reference frames can be described by a sequence of three rotations . ...

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. ...