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The machining of materials on micrometer and sub-micrometer scale is considered the technology of the future. The current techniques for micro manufacturing mostly are silicon based. These manufacturing techniques are not suitable for use in demanding applications like aerospace and biomedical industries. Micro electrochemical machining (μECM) removes material while holding micron tolerances and μECM can machine hard metals and alloys. This study aims at developing a novel μECM utilizing high frequency voltage pulses and closed loop control. Stainless steel SS-316L and copper alloy CA-173 were chosen as the workpiece materials. A model was developed for material removal rate. The research studied the effect of various parameters such as voltage, frequency, pulse ON/OFF time, and delay between pulses of the stepper motor on the machined profiles. Experimental data on small drilled holes agreed with theoretical models within 10%. Micro burrs can be effectively removed by optimal μECM. A sacrificial layer helped to improve the hole profile since it reduced 43% of corner rounding.

Thesis (Ph. D.)--University of Cincinnati, 2002. / Title from electronic thesis title page (viewed Apr. 21, 2003). Includes abstract. Includes bibliographical references.

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Closed captioning has not improved since early 1970s, while film and television technology has changed dramatically. Closed captioning only conveys verbatim dialogue to the audience while ignoring music, sound effects and speech prosody. Thus, caption viewers receive limited and often erroneous information. My thesis research attempts to add some of the missing sounds and emotions back into captioning using animated text. The study involved two animated caption styles and one conventional style: enhanced, extreme and closed. All styles were applied to two clips with animations for happiness, sadness, anger, fear and disgust emotions. Twenty-five hard of hearing and hearing participants viewed and commented on the three caption styles and also identified the character’s emotions. The study revealed that participants preferred enhanced, animated captions. Enhanced captions appeared to improve access to the emotive information in the content. Also, the animation for fear appeared to be most easily understood by the participants.

Closed captioning has not improved since early 1970s, while film and television technology has changed dramatically. Closed captioning only conveys verbatim dialogue to the audience while ignoring music, sound effects and speech prosody. Thus, caption viewers receive limited and often erroneous information. My thesis research attempts to add some of the missing sounds and emotions back into captioning using animated text. The study involved two animated caption styles and one conventional style: enhanced, extreme and closed. All styles were applied to two clips with animations for happiness, sadness, anger, fear and disgust emotions. Twenty-five hard of hearing and hearing participants viewed and commented on the three caption styles and also identified the character’s emotions. The study revealed that participants preferred enhanced, animated captions. Enhanced captions appeared to improve access to the emotive information in the content. Also, the animation for fear appeared to be most easily understood by the participants.

No description available.

No description available.

There is no abstract available for this dissertation.

No description available.