Stephen E. Silliman

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The largest city in Benin, West Africa (Cotonou), is reliant upon groundwater for its public water supply. This groundwater is derived from the Godomey well field which is located approximately 5 Km north of the coast of the Atlantic Ocean and in close proximity to Lake Nokoue—a shallow lake containing water with elevated concentration of chloride and other(More)
Groundwater samples were collected at over 100 locations in Benin, West Africa, for the purpose of characterizing region-wide spatial variation in groundwater quality as indicated by concentrations of a number of elements measured within the samples. Analytic techniques ranged from field measures of conductivity and pH, to characterization of major and(More)
Multiple theoretical sampling designs are studied to determine whether sampling designs can be identified that will provide for characterization of ground water quality in rural regions of developing nations. Sampling design in this work includes assessing sampling frequency, analytical methods, length of sampling period, and requirements of sampling(More)
The observation of substantially different retention rates of men versus women from initial enrollment as first-year engineering intents to enrollment as engineering majors at the beginning of the sophomore year at the University of Notre Dame has motivated an examination of demographic data to assess retention patterns. Based on the numbers of students(More)
Providing stimulating lectures to large groups of students has been one of the most challenging aspects of a first-year engineering course sequence. Prior efforts at improving the lecture environment included use of an audience response system (ARS). While the ARS was a positive influence, two limitations were identified: (i) it did not provide for(More)
The University of Notre Dame's freshman engineering course is designed both to provide students with foundational skills in engineering and to provide information necessary for the students to make informed decisions when selecting a major. It was noted during the prior two academic years that a significant number of students (~10-15%) withdrew from the(More)
The College of Engineering at the University of Notre Dame will complete the third year of its new Introduction to Engineering course sequence at the end of the Spring 2003 semester. Retention statistics, student surveys and exit interviews conducted by faculty, engineering administrators and first-year student advisors have provided insight into the(More)
The observation of substantially different retention rates of men versus women in a required first-year, two-course " Introduction to Engineering Systems " sequence at the University of Notre Dame motivated an examination of demographic and survey data to assess retention patterns. In the course of examining these data, it became evident that different(More)
Africa) initiated a program whereby undergraduates at UND work with graduate students at UAC. The program involves two years of collaborative effort, including 8 weeks of field effort in Bénin. Constraints encountered were related to different languages used by the two student groups, funding, travel to Africa, project definition, and technical training.(More)
Laboratory experiments involving both homogeneous and heterogeneous porous media are used to demonstrate that fluid flow and solute transport will occur regularly in the capillary fringe (CF), including both vertical (upward as well as downward) and horizontal flow velocities. Horizontal flow above the water table appears to be limited primarily to the(More)