Discusses the basics of inexpensive modular synthesizers (which demonstrate various principles of sound). Topics considered include: oscillators and musical range; oscillator waveforms and characteristics; synthesizing simple musical sounds; and modulation and sweeping filter effects. Suggestions for purchasing or building synthesizer components…

Suggests using a "bed of nails" (array of nails on a board) as a resistance demonstration where steel balls pass through the lattice of nails like electrons through metal. Although weaknesses of Drude's electrical conduction model are noted, the activity is recommended since it clearly illustrates drift velocity. (DH)

Presents objectives, required readings, course outline, and bibliography for an engineering and morals course. Course topics include: history of technology; engineering as a profession; engineering ethics (with four case studies); and career choice. Emphases are on the foundation of and criteria for making moral decisions. (DH)

Examines the nature of selected traditional cosmological concepts among literate and nonliterate Nigerians. Findings indicate that the respondents, regardless of their status, hold both scientific and traditional notions of the universe. A preference for a scientific world view was evidenced by those who experienced a history/philosophy of science…

Proposes that identification keys provide an orderly strategy for the identification of igneous and metamorphic rocks in an introductory geology course. Explains the format employed in the system and includes the actual key guides for both igneous and metamorphic rocks. (ML)

Discusses four different methods for measuring self-inductance based on the definition of inductance, the alternative definition, phase difference and LC resonance. Provides circuit diagrams and typical oscilloscope traces. (YP)

Reviews research done on the nature of vision from a neurologic perspective. Proposes a multiplex filter model to explain patterns in the signals transmitted to the brain from the retina. Describes experiments done to test the model. (CW)

Shows how the thermodynamic condition for equilibrium in an isolated system can be derived by the application of Boltzmann's law to a simple physical system. States that this derivation could be included in an introductory course on chemical equilibrium to help prepare students for a statistical mechanical treatment presented in the curriculum.…

This discussion uses a more difficult reaction as the prototype to derive the standard equation for chemical equilibrium. It can be used by students who can understand and use partial derivatives. (CW)

This article presents the results of a study to identify problems and recommend solutions to training and education deficiencies of the environmental workforce for risk assessment and hazardous waste. Cites five recommendations developed as a result of a workshop held in March 1986. (Author/CW)

Describes a program at Indiana University-Purdue University at Indianapolis with two distinctive features: a parallel work-study format and integration of a conventional Master of Science academic component of coursework and research with work experience. Discusses student characteristics, placement, and response to the program. (CW)

Examines three errors and learning difficulties found to be typical in general chemistry, gives the source of each problem, and presents a method of correcting each problem. Suggests using analysis of examination errors for the purpose of altering instruction for the improvement of student learning. (CW)

Reported is the use of a wrestling photograph in a noncalculus introductory physics course. The photograph presents a maneuver that could serve as an example for a discussion on equilibrium, forces, torque, and angular motion. Provided are some qualitative thoughts as well as quantitative calculations. (YP)

Compares the university training of scientific personnel in each country to see how strengths are nurtured. Discusses curriculum content as well as the societal and cultural factors which determine the educational environment. Describes entrance examinations, undergraduate programs, curricula, and societal views. (CW)

Describes a science activity designed for undergraduate biochemistry classes. Provides background, a list of materials, experimental procedures, and the results of this experiment. (CW)