Collection

1981 North Midwest Section

Authors

Lester W. Spencer

between the incident ray and the perpendicular is great enough, the refracted ray will bend 90 degrees from the perpendicular as shown in figure lb. The angle of incidence at which this occurs is called the critical angle. At angles of incidence greater than the critical angle, no light will pass into the second medium, as shown in figure le. There- fore, the light is entirely reflected back into the first medium and if the interfact is very smooth Figure lb. CRITICAL ANGLE and is protected from contamination, virtually no light is lost in this total internal reflection (Kapany, 1960) . For the simplified schematic shown in figure 2a, the core will have the highest refractive index (n1 in figure 2b) and the cladding index will

Collection

1981 North Midwest Section

Authors

O. Hawaleshka

overproduction of engineering graduates while atthe same time noting a scarcity of high quality graduates and for well-trained technicians and craftsmen. It is a reflection on the culturalenvironment and of the quality of graduates presently produced by theschools when the Survey noted that at least 30% of engineering graduatesemployed were employed in jobs of low technician or craftsmen levelsalthough the official job descriptions and titles always included theword i'engineer 11 • And so we see "Senior Instrument Engineers" with 18years experience after graduating from one of the best recognized engi-neering schools in the country and working for the largest electricalutility actually repairing Bourdon pressure gauges or electric wall plugs.In actual

Collection

1981 North Midwest Section

Authors

P. C. Pfister

resource alternatives to oil and natural gas. In thespring quarter, rather than disperse the department's limited monetaryand faculty involvement over the full spectrum of alternate energysources: solar, wind, biological and coal, we restricted our optionsto the power available in the wind. It seemed particularly appropriatein North Dakota that we should in time be able to harvest the wind aswell as we have the prairies. To some extent this decision reflected my personal bias, windenergy is more subtle and potentially destructive (exciting) than solarenergy. Wind energy conversion systems (WECS)* utilize many of the en-gineering disciplines: machine/structural design, aerodynamics, elec-trical machinery, controls, etc. Applications of wind

Collection

1981 North Midwest Section

Authors

David A. Carlson; Clyde E. Work

quicklyanalyzed, displayed and used to drive animation routines thataccurately reflect the physical movement of real objects orsystems. CURRENT DEVELOPMENT EFFORTS- FUTURE DIRECTIONS To make it possible for classes to view the graphicsgenerated by the computer, the Aquastar IIIB video projectionsystem developed and manufactured by Electronics SystemsProducts, has been acquired. This system produces abrilliant sharp image of 400 lumens on either a flat orcurved screen from 4 to 20 feet wide. It is remotecontrolled and capable of front or rear projection. Itscompact size, 78 lb. weight, and flexible focusing systemmake it useful in a variety of configurations. The system accepts and projects signals from a widevariety