Conference Session

Introduction to Materials Courses

Collection

2009 Annual Conference & Exposition

Authors

Kathleen Kitto, Western Washington University

Tagged Divisions

Materials

integrating ethics throughout our curriculum.] SulzerOrthopedics (later Centerpulse Orthopedics, later acquired by Zimmer Holdings) recalled 25,000of its Inter-Op® acetabular caps in December 2000 with approximately 17,500 having beenimplanted47. Later reports showed the scope of the problem to be more than 30,000 devices withmore than 20,000 implanted50. More than 2700 revision surgeries were needed as a result49-51 ofa manufacturing process error that occurred after Sulzer brought the process to manufacture thecups in-house. A mineral oil based lubricant had accidentally contaminated the machine coolantand the acetabular cups during CNC machining (subsequent cleaning operations did not detectthe contamination). The mineral oil on the cup prevented

Conference Session

Pedagogy and Assessment III

Collection

2009 Annual Conference & Exposition

Authors

Peter Osterberg, University of Portland; Aziz Inan, University of Portland

Tagged Divisions

Electrical and Computer

AC 2009-2517: CALCULATION OF THE GENERAL IMPEDANCE BETWEENADJACENT NODES OF INFINITE UNIFORM N-DIMENSIONAL RESISTIVE,INDUCTIVE, OR CAPACITIVE LATTICESPeter Osterberg, University of Portland Dr. Osterberg is an associate professor in the Department of Electrical Engineering and Computer Science in the School of Engineering at the University of Portland (Portland, OR). He has been on the faculty since 1996. He received his Ph.D. from MIT in 1995. Between 1978 and 1991, Dr. Osterberg worked for Texas Instruments, GTE and Digital Equipment Corporation. His research interests include MEMS, Nanoelectronics, Signals and Systems, and Analog and Digital VLSI Integrated Circuits.Aziz Inan, University

Conference Session

Solar, Wind, and Novel Energy-System Initiatives

Collection

2009 Annual Conference & Exposition

Authors

Faruk Yildiz, Sam Houston State University

Tagged Divisions

Energy Conversion and Conservation

rectifier circuit wasessential to convert noisy AC output voltage from the generator to DC voltage because almost allelectronic components operate at DC voltages. The AC voltage signal from the generator unitwas converted to DC voltage signal using full-wave bridge rectifier.[23]After full-wave rectification, where the alternating current (AC) was converted to direct current(DC), the voltage was increased by a DC-DC boost converter.[24] Consideration of energyharvesting components resulted in a decision to integrate an LTC3429 integrated circuit regulatorchip which only needed 0.8V threshold inputvoltage to start running its internal circuitry.The actual energy harvesting circuit design isshown in Figure 7. Since the generator unit inthis

Collection

2009 ASEE Midwest Section Conference

Authors

Bruce Dvorak; Dennis Schulte; Mary Garbacz; Shari Aldrich; David Admiraal; Julia Soulakova

relationship (while still being significant)between students’ scores on the BWS test and the writing sample (R2 = 0.11, p<0.001).Interestingly, composite ACT score negatively correlated with the number of English classestaken (R2= 0.18, p=0.007), meaning that students who perform better on the ACT exam aretaking fewer English classes. This is evidence that some students with weaker academicpreparation, especially in Omaha, are already taking additional English classes beyond the onetechnical writing class required by the B.S. Civil Engineering curriculum. In Lincoln, studentswith <19 on the ACT English subscore (though few) must take an additional English class. Thistrend was in spite of the stronger BSEN students taking two writing classes for