In this study it was aimed to design and operate a new system with sufficient number of rotating drums since rotation of turntable is incapable of providing uniformity. Effect of new design on final color values and moisture content were also investigated. Macaroni beads were colored with CoCl2 solution and processed in a domestic microwave oven starting from 11.3&plusmn / 0.10% moisture content and L*= 41.1&plusmn / 0.31 , a*= 8.5&plusmn / 0.27 , b*= 5.3&plusmn / 0.22 color value with turntable and the proposed design. In experiments 40%, 60%, 80% and 100% power levels and 1, 2 and 3 min processing times and 2 different locations were used. The average color values measured were not affected significantly by the locations studied inside the cavity for both operation types. The changes in color values were found to be significant with altering power level for both operation types. Time also changed average color values for samples processed on turntable and in rotating drums. The new design lowered the average L* values of the final product and kept the sample from burning. Average a* and b* values were not significantly affected by the operation type. The uniformity of final product in terms of color distribution was affected significantly by the operation type and the improvement in uniformity calculated quantitatively by means of variances and found out that the new design improved the color uniformity of the final product by 94.7%. The non-uniformity of the products processed on turntable was significantly changed with power level. Time or location did not affect uniformity significantly for both operation types. The final average moisture contents of samples processed on turntable were lower than the ones processed with the new design. That is, the rotating drums lowered the moisture removal compared to the turntable.

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Abstract The present investigation is performed by repeated experiments to simulate the impingement cooling heat transfer in leading-edge region of gas turbine with thermochromic liquid crystals. The experiments was studied on a rotating square duct without crossflow effect from three different rotational speeds of 0, 30 and 60 rpm. The study covered jet Reynolds number 7000 to 9000 and the rotational speeds from 0 to 60 rpm. Results are presented and focused on the effect of three different rotational speeds. Nusselt number values increased (up to 14%) with Reynolds number. However, Rotation induced coriolis and centrifuged forces and decreased the Nusselt number values about 9% which is quite coincided with those of previous studies.

This thesis presents a systematic scheme to design the propulsive force and axial force control of a single-sided permanent-magnet axial-flux motor with aluminum stator core (SPAMA) through the detailed mathematical model and operational analysis. According to the rotating magnetic field theory combining with the recoil line characteristics of permanent magnet and the magnetic equivalent circuit, appropriate projection of the stator currents to achieve the propulsive force and axial force control can be realized. From these evaluations, a feasible operational guidance for SPAMA field oriented control (FOC) framework can be successfully developed. Finally, based on our system model and simulation results, the steady-stay characteristics of the machine can be observed.

Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution), 2003. / Includes bibliographical references (p. 145-148).

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People of the Caribbean have maintained social networks that provide security in the face of human and natural perturbations. Rotating savings and credit associations (ROSCAs) constitute one such system, which probably came to much of the Caribbean with African people and persisted through slavery. As a foundation of creole economic systems throughout the Caribbean, ROSCAs are time-tested dimensions of traditional culture and a source of pride and identity. This analysis of the history and contemporary functions of ROSCAs in Barbados and the Bahamas is based on more than a thousand extensive and intensive first-person interviews and surveys. This article argues that ROSCAs continue, much as they did in the past, to provide critical human services, social stability, and a source of African-ancestor identity in these two nations. (Women’s power, rotating credit, Bahamas, Barbados).

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