6,908 research outputs found
Calvin Burgess, 1953 Junior
Calvin Burgess was a student at Jacksonville State Teachers College in 1952-1953.https://digitalcommons.jsu.edu/lib-ac-histimg/6262/thumbnail.jp
Barbara Burgess, Student
Barbara Burgess was a student at Jacksonville State University in the 1960s. (circa 1967)https://digitalcommons.jsu.edu/lib-ac-histimg/18777/thumbnail.jp
Clifford Burgess, Associate Professor
Clifford Burgess was an Associate Professor of Education at Jacksonville State College (now Jacksonville State University) in the mid 1960s.https://digitalcommons.jsu.edu/lib-ac-histimg/12485/thumbnail.jp
Initial state and transition-state effects in the mercury(ii)-catalysed aquation of chlorotransition-metal complexes in binary aqueous solvent mixtures
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Influence of ac ageing on space charge dynamics in LDPE
Polymeric materials have been widely used as insulation in power industry due to their excellent electrical properties. However, these properties deteriorate in time irreversibly when the material is subjected to electric stress. Although space charge is believed to play an important role in ac ageing, exact mechanisms are poorly understood due to very limited experimental data. In the present work efforts have been made to investigate the influence of ac ageing on space charge dynamics in low-density polyethylene (LDPE). LDPE films with 200mm were aged at 50 kV/mm at 50 Hz for various times at ambient temperature. Space charge dynamics in the samples prior to and after ageing were monitored using the pulsed electroacoustic (PEA) technique under dc electric stress. The results indicate that there is a significant amount of homocharge accumulation in the unaged sample due to charge injection. These injected charges are the captured by the deep traps originated from the interface between crystalline and amorphous regions in LDPE. Ageing under ac condition does not necessarily lead to an increase in amount of charge in the bulk but leads to an increase in mobility of charge carriers. Chemical analysis by infrared spectroscope (FTIR) reveals there are chemical changes taken place in the bulk of the material after ac ageing. It is believed that the chemical changes introduce shallow traps which promote the movement of charge carriers in the bulk. Consequently, the injected charges spread across the sample
A power sharing series power BJT array with isolated low voltage control for AC power control applications
A technique for a continuously variable AC resistance using a series BJT array is presented. This array provides high power dissipation capability and uniform voltage and power distribution across the individual transistors. The array, controlled using a set of optoisolators to maintain the electrical isolation between the control circuits and the power stage, could be used as the basis to develop several useful techniques including a solid state AC regulator with comparable performance to the commonly used ferro-resonant systems; a linear AC electronic load suitable for testing UPS and other power conditioners; and, in other AC power control applications such as switching capacitors in AC resonant circuits
Charlie Grisham and Ray Burgess, 1954-1955 Class Favorites
Charlie Grisham and Ray Burgess were students at Jacksonville State College. In 1954-1955 Charlie Grisham, left, was selected as Junior Class Favorite and Ray Burgess, right, was selected as Freshman Class Favorite.https://digitalcommons.jsu.edu/lib-ac-histimg/10895/thumbnail.jp
Betty Burgess and Unidentified Male 4
Betty Burgess was a student at Jacksonville State College (now Jacksonville State University) in the mid 1960s. She is shown here with an unidentified male in uniform. (circa 1966)https://digitalcommons.jsu.edu/lib-ac-histimg/17513/thumbnail.jp
Betty Burgess and Unidentified Male 1
Betty Burgess was a student at Jacksonville State College (now Jacksonville State University) in the mid 1960s. She is shown here with an unidentified male in uniform. (circa 1966)https://digitalcommons.jsu.edu/lib-ac-histimg/17510/thumbnail.jp
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