American Studies Commons^™

Linearity Optimization Of Power Transistors Utilizing Harmonic Terminations, Ravi Kumar Varanasi

USF Tampa Graduate Theses and Dissertations

This thesis focuses on the characterization and optimization of microwave power transistors using a commercial on-wafer harmonic load pull system. Specific attention is paid to the output tuning of the second harmonic impedance presented to the device. The ability to quantify the level of accuracy in a load pull system is explored by using various calibration validation methods, including a method called Delta-Gt. In this work experiments and simulation comparisons are described for three different device technologies, namely GaAs pHEMT, GaAs HJFET and InGaP HBT. Externally supplied non-linear models were used for the simulations and these were exercised and compared …

Technology And Teacher Training: The Systematic Design And Development Of A Framework For Integrating Technology Into Jamaica’S Teacher Training Programs, Carol N. Granston

USF Tampa Graduate Theses and Dissertations

Over the last five years, there has been an increased number of computers in schools and teachers' colleges in Jamaica. In addition, recently revised national policy documents have indicated the need to infuse technology into the curricula of all schools. Despite these investments in computers, however, there has been little corresponding development in training teachers to use computers and emerging technologies as teaching learning tools.

The purposes of the study were three-fold: (a) to describe the current state of technology integration in Jamaica's teacher training programs (b) assess the extent to which teachers' college faculty and pre-service teachers perceived themselves …

Improved 1/F Noise Measurements For Microwave Transistors, Clemente Toro Jr.

USF Tampa Graduate Theses and Dissertations

Minimizing electrical noise is an increasingly important topic. New systems and modulation techniques require a lower noise threshold. Therefore, the design of RF and microwave systems using low noise devices is a consideration that the circuit design engineer must take into account. Properly measuring noise for a given device is also vital for proper characterization and modeling of device noise. In the case of an oscillator, a vital part of a wireless receiver, the phase noise that it produces affects the overall noise of the system. Factors such as biasing, selectivity of the input and output networks, and selectivity of …

Operational Evaluation Of Right Turns Followed By U-Turns At Signalized Intersections As An Alternative To Direct Left Turns, Jingjing Fan

USF Tampa Graduate Theses and Dissertations

Direct left turn (DLT) movements have a lot safety and operation problems. They increase conflicts, delay and reduce capacity of the roadway. Increasing, many states and transportation agencies are considering using right-turns followed by u-turns as an alternative to direct left turns. Recently, Florida state are planning to close median openings in order to reduce the safety and operational problems caused by DLT. The left-turn egress movement would then to be made by turning right to the arterial road and then making a u-turn at an available downstream median opening or a signalized intersection. FDOT sponsored a project in 2001 …

Effects Of Faculty And Peer Mentoring On Perceived Stress And Social Support Of College Student Athletes, Valerie R. Pfister

USF Tampa Graduate Theses and Dissertations

Mentoring programs often focus on assisting students with the transition to college life and encouraging academic success. This study consisted of a quantitative examination of faculty and peer mentoring and freshmen student athletes' perceived transitional stress and social support. Surveys that provided a numerical value to perceived stress and social support supplied a basis for comparison. In addition, a qualitative element, consisting of personal interviews, was used to assess the quality of the mentoring relationships that developed.

Volunteer mentors were trained on mentoring strategies by the researcher. Sixty-one student-athlete volunteers from the sports of baseball, basketball, cheerleading, cross country, competitive …