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[null,"1.","Record Nr.",null,"UNINA9910711276803321"]
[null,null,"Autore",null,"Kirstein Arthur F"]
[null,null,"Titolo",null,"Tests of prestressed cellular slabs : (series of slabs nos. 1 through 29) final report / / Arthur F. Kirstein"]
[null,null,"Pubbl/distr/stampa",null,"Gaithersburg, MD : , : U.S. Dept. of Commerce, National Institute of Standards and Technology, , 1959"]
[null,null,"Descrizione fisica",null,"1 online resource"]
[null,null,"Collana",null,"NBS report ; ; 6321"]
[null,null,"Soggetti",null,"Load factor design - Testing"]
[{"$nulls":4},"Prestressed concrete - Testing"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Materiale a stampa"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,null,"Note generali","1959."]
[{"$nulls":4},"Contributed record: Metadata reviewed, not verified. Some fields updated by batch processes."]
[{"$nulls":4},"Title from PDF title page."]
[null,null,null,"Nota di bibliografia","Includes bibliographical references."]
[null,"2.","Record Nr.",null,"UNINA9910557196203321"]
[null,null,"Titolo",null,"DC motors / / Video Education Australasia"]
[null,null,"Pubbl/distr/stampa",null,"New York, N.Y., : Infobase, [2009], c2007"]
[null,null,"Descrizione fisica",null,"1 streaming video file (25 min.) : sd., col., digital file. + + instructional materials (online)"]
[null,null,"Collana",null,"Direct Current: Understanding DC Electricity"]
[null,null,"Soggetti",null,"Electricity - Study and teaching"]
[{"$nulls":4},"Electricity"]
[{"$nulls":4},"Magnetism"]
[{"$nulls":4},"Educational films."]
[{"$nulls":4},"Internet videos."]
[{"$nulls":4},"Videorecording"]
[null,null,"Lingua di pubblicazione",null,"Inglese"]
[null,null,"Formato",null,"Videoregistrazione"]
[null,null,null,"Livello bibliografico","Monografia"]
[null,null,"Nota di contenuto",null,"Electricity and Magnetism (4:20) -- Magnetism and Movement (3:05) -- DC Motors: Useful Motion (4:18) -- How to Make a DC Motor (2:54) -- DC Motors: Design Improvement (4:38) -- Applications of DC Motors (4:57)"]
[null,null,null,"Sommario/riassunto","Showing how interactions between magnetic fields lead to the production of motion, this program introduces viewers to the inner workings of DC motors. Topics include the work of Hans Christian Oersted, the creation of the first electric motor by Michael Faraday, and the rules for predicting field direction and forces on current carriers. The construction of a simple DC electric motor is shown with helpful graphics and 3-D animation sequences explaining the purpose of the commutator and other components of a DC motor. Also studied are various applications of DC motors, versions of brushless DC motors, and the Right Hand Slap Rule."]