6,126 research outputs found
A direct A.C. to A.C. regenerative frequency and voltage converter
No full textIncludes bibliographical references.The reliable variable speed operation of an a. c. machine over a wide speed range is a problem that has received attention for some time. In this thesis a system to permit such operation from a fixed frequency fixed voltage supply is proposed, under the name of the asynchronous modulation converter. This converter is of the cycloconverter family, but is force-commutated and is not synchronised with the supply frequency. The power switching element comprises a power transistor in a diode bridge, coupled to the control circuitry by opto-isolators. The output of the a-mod converter is produced by a "chopper" modulation process and this results in the harmonics present being at frequencies well removed from the fundamental. A feedback system to ensure smooth commutation of the output current from the power switches is described. This feedback system operates by sensing the rate of rise of the inductive voltage surge on the load when a switch is opened to operate a freewheel path switch
History of the expedition of Captains Lewis and Clark, 1804-5-6; reprinted from the edition of 1814, Vol. 2
No full textHistory of the expedition under the command of Captains Lewis and Clark
Lewis, Charles (Birth, 1907-12-09)
No full textAddress: E. McMicken Avenue6166/Pg. 195/1907/M W/Mo./Cinti,Ohio/Dr. A.C. BauerOriginal record filed in drawer labeled 'Leonhard-Lewis, P'
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Rights lost in translation? Fact-insensitive laws, the Human Rights Act and the United Kingdom's ban on political advertising
No full textThis article explores the issue of blanket legal prohibitions and how these sit with proportionality under the ECHR and the HRA as interpreted by the European Court of Human Rights and English courts. The author first looks at Strasbourg case law and factors examined by the European Court in deciding whether a fact-insensitive law is proportionate. He then considers the domestic decision of R. (on the application of Animal Defenders International) v Secretary of State for Culture, Media and Sport and finally analyses the difficulties this approach raises in giving effect to Convention rights under the mechanisms of the HRA
Lewis Joseph Kennedy
No full textSeries 85298 | State Historical Society | World War I service questionnaires | Lewis Joseph KennedyThis series contains military service questionnaires and photographs of Utah's World War I veterans compiled by the Utah State Historical Society shortly after the war. The forms were sent to veterans or their families to complete and return
Lewis R Fife
No full textSeries 85298 | State Historical Society | World War I service questionnaires | Lewis R FifeThis series contains military service questionnaires and photographs of Utah's World War I veterans compiled by the Utah State Historical Society shortly after the war. The forms were sent to veterans or their families to complete and return
Zane Grey with Orange A.C. baseball team
No full textThis photograph shows Ohio native Zane Grey with the Orange A.C. Baseball Team, ca. 1896-1904. Prior to becoming a well-known author of western novels, Zane Grey was also a dentist and a semi-professional baseball player, with teams including the Orange Athletic Club and the Newark (New Jersey) Colts
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