... If at any point on such a line we place an ideal compass needle, free to turn in any direction (unlike the usual compass needle, which stays horizontal--such needles exist, see bottom of page) then the needle will always point along the field line (drawing below). ... Because of this attachment, the behavior of electrified gas ("plasma") in space, a gas of free ions and electrons, is dictated by the structure of field lines: Electric currents, for instance, find it easiest to flow along such lines. ...

... A dynamo (or electric generator) is a device converting . ... Faraday discovered that by moving a magnet next to a closed electric circuit, or changing the magnetic field passing through it, an electric current could be "induced" to flow in it. ... Faraday's disk dynamo Faraday showed that another way of inducing the current was to move the electric conductor while the magnetic source stood still. ... Faraday's disk dynamo needs a magnetic field in order to produce an electric current. ...

... Observing . ... Solar Observing . ... April 3 (SUN) - Solar Observing, Central Park , Manhattan . ... APRIL'S SKY . ... Lecture Series at the American Museum of Natural History The Amateur Astronomers Association is proud to present an astronomy lecture series from October through May each year for our members and the .. ... The€аAmateur Astronomers Association of New York€аwas organized in 1927 to promote the study of Astronomy, emphasizing its cultural and inspirational value. ...

... Лекция 2 (40 K) | Лекция 3 (37K) | Лекция 4 (39K) | Лекция 5 (43K) | Лекция 6 (47K) | Лекция 7 (32K) | Лекция 8 (54K) | Лекция 9 (41K) | Лекция 10 (45K) | Лекция 11 (38K) | Лекция 12 (44K) | ... Postscript-файл (36 K) | ... Алгоритмическая сложность и класс P . ... Вероятностное вычисление и класс BPP . ... Идея квантового вычисления. ... Определение и простейшие свойства квантового вычисления. ... Вычисление, устойчивое к ошибкам (классическое и квантовое). ...

... SUN MOON MERCURY VENUS MARS, JUPITER SATURN . ... Mars . ... Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets? ... RELATED TOPICS: MAGNETIC FIELD . Planetary magnetic fields are definitely related to rotation, but directly not so much. ... Get instant access to subscriber content on Astronomy.com! ...

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... Directives | ... Apache HTTP Server Version 2.2 . ... This module controls the setting of the Expires HTTP header and the max-age directive of the Cache-Control HTTP header in server responses. The expiration date can set to be relative to either the time the source file was last modified, or to the time of the client access. ... access . ... If set to On , the headers will be added to served documents according to the criteria defined by the ExpiresByType and ExpiresDefault directives ( q.v. ). ...

Modules | Directives | ... Apache HTTP Server Version 2.2 . Apache > HTTP Server > Documentation > Version 2.2 > Modules . Available Languages: de | ... Each Apache directive available in the standard Apache distribution is listed here. ... A Directive Quick-Reference is also available giving details about each directive in a summary form. ... Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our mailing lists . ...

. Fortran directive lines are identified by an F in column 1. The remainder of the line is written in columns 1 to 79 of the FORTRAN output file. This facility can be used to pass directives to the FORTRAN compiler (e.g. debug directives). It should not be used to bypass SHELTRAN control structures.

This is a series of periodic postings by Terry Moseley of the Irish Astronomical Association . ... Issued 2004 December 28th . Mercury correction; Comet Macholz, lecture . ... Lidl Binocs, IAA lecture, Dunsink, Geminids . ... 2004's best meteors, TV, Lecture, IAA Party . ... IAA lecture, TV Prog, 2 New Lectures, IAA sub . ... Two Lectures, ISS, next IAA lecture . ... Major TV Series, IAA Lecture . ... 2 Lectures, Lecture series, S.A.N. -Issued 2004 September 21st . ... Issued 2004 June 27th . ...

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This module provides for the generation of Expires HTTP headers according to user-specified criteria. ... This module controls the setting of the Expires HTTP header in server responses. The expiration date can set to be relative to either the time the source file was last modified, or to the time of the client access. ... ExpiresByType . ExpiresDefault . The ExpiresDefault and ExpiresByType directives can also be defined in a more readable syntax of the form: . ... Module: mod_expires . ...

... The (very) slow rotation of magnetic Ap stars. ... Magnetic stars in young clusters and associations. ... Magnetic fields in low-mass stars from high-resolution infrared spectroscopy. ... Magnetic field measurements of late B-type starss. ... Measurement of magnetic field of FK Com. ... Magnetic field of white dwarfs. ... The magnetic star evolution project (teleconference). ... Conference-2014 . Program . ... Laboratory for the Stellar Magnetism Study of SAO of RAS . ...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... des actualit†йs . des reportages . ... les plus belles images de l'Univers d†йcrypt†йes pour vous . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil Un impact record vu en direct sur la Lune . ... Comment d†йtecter des flashs sur la Lune ? ... 30/03/2016 - La chute dтАЩun corps c†йleste sur Jupiter vue en direct . ...

Drawing and Part Configuration Management and Release Procedures: . ... Context: This procedure is intended for use by APO Telescope Drafting and Engineering personnel for the development, release and maintenance of telescope related models, drawings, and other controlled documents to facilitate the sharing of information between the various institutions and personnel that have need of technical information and engineering files regarding APO telescope design and development. ... Release Procedure: . ...

... The Australian National University] [Department of Physics] [Paul Francis] [Main Roleplay Page] . These exercises are my attempt to adapt the technique of Problem Based Learning to the context of introductory astronomy and astrophysics classes. ... As students grapple with the puzzle, they are forced to learn the subject matter of the course. ... This exercise is designed for 1st year University students with a reasonable high-school background in Maths and Physics. ...

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Next: Rotation Periods of ZAMS stars Previous: T Tauri Stars . ... The first attempts to directly measure periodic modulation of T Tauri stars occurred in the early 1980s. Rydgren & Vrba (1983) observed four PMS stars using photoelectric photometry over a period of seven consecutive photometric nights. ... Because the spot lifetime is much longer than the rotational period, the observed effect will be a modulation of the light from the star synchronously with the rotation period. ...

OptInt PmWiki : Pm Wiki / Page Directives . ... attachlist NAME:) shows a list of attachments of the group or page NAME. (:attachlist ext=xxx:) specifies an extension for filtering by type of file. (:attachlist *:) shows the uploads directory and permits browsing of all uploaded files by directory ( will not work if $EnableDirectDownload is set to 0 ). (:description text:) . ... If supported by the skin , each of these turns off the corresponding portion of the page. (:redirect PageName:) . ...

Cherechukin A.A., Koledov V.V., Shavrov V.G., Tulaikova A.A., Vasil'ev A.N. Magnetic and structural phase transitions in Ni2+УMn1-УGa (0<У<1) alloys are investigated experimentally. The martensite domains formation under the action of external magnetic field on the surface of polycrystalline Ni2,19Mn0,81Ga specimen was investigated by optical method. ... It is found that the martensite phase formation temperature is enhanced by the order of 0,3 K in magnetic field of 1 kOe. ...