6,200 research outputs found
Janet Clements, 1953 Junior
No full textJanet Clements was a student at Jacksonville State Teachers College in 1952-1953.https://digitalcommons.jsu.edu/lib-ac-histimg/6432/thumbnail.jp
Janet Clements, 1952 Sophomore
No full textJanet Clements was a sophomore at Jacksonville State Teachers College in 1951-1952.https://digitalcommons.jsu.edu/lib-ac-histimg/6044/thumbnail.jp
Rita Clements, Student 1
No full textRita Clements was a student at Jacksonville State College (now Jacksonville State University) in the mid 1960s.https://digitalcommons.jsu.edu/lib-ac-histimg/14816/thumbnail.jp
Janet Clements, 1953 Junior Favorite
No full textJanet Clements was a student at Jacksonville State Teachers College (now Jacksonville State University). In 1952-1953 she was a Junior Favorite.https://digitalcommons.jsu.edu/lib-ac-histimg/4060/thumbnail.jp
Mike Clements, 1970-1971 Pi Chi Member
No full textMike Clements was a student at Jacksonville State University. In 1970-1971 he was a member of Pi Chi.https://digitalcommons.jsu.edu/lib-ac-histimg/39340/thumbnail.jp
Influence of ac ageing on space charge dynamics in LDPE
No full textPolymeric 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
No full textA 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
Robert Clements, 1978-1979 Men\u27s Basketball Player 1
No full textRobert Clements was a member of the men\u27s basketball team at Jacksonville State University in 1978-1979. Shown he wears jersey #30.https://digitalcommons.jsu.edu/lib-ac-histimg/35574/thumbnail.jp
Experimental High-Frequency Parameter Identification of AC Electrical Motors
Get PDFIn order to predict conducted electromagnetic interference in inverter-motor drive systems, high-frequency (HF) motor models are requested and the involved parameters have to be available. In previous studies, the authors have presented an accurate HF model for induction motors and they have defined the procedures to identify the model parameters. In this paper, these results are extended to several types and sizes of industrial ac motors such as induction, synchronous reluctance (without interior permanent magnets), and brushless motors. The model parameter-identification procedure has been improved, and it is based on a least-squares data fitting applied to the measured magnitude and phase-frequency-response curves of the phase-to-ground and the phase-to-neutral impedances. The aim of this paper is to provide quick indications to select the suitable values of the HF model parameters, with reference to the size and type of the ac motor, to evaluate the HF voltage and current components in inverted-fed ac motor system
Robert Clements and Bruce Sherrier, 1978-1979 Basketball Players 1
No full textThese students were members of the Men\u27s basketball team at Jacksonville State University in 1978-1979. Shown inside Pete Mathews Coliseum are Robert Clements and Bruce Sherrier each holding a basketball on the court.https://digitalcommons.jsu.edu/lib-ac-histimg/38225/thumbnail.jp
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