Discusses a flexible, high performance subband coding system. Residual vector quantization is discussed as a basis for coding subbands, and subband decomposition and bit allocation issues are covered. Experimental results showing the quality achievable at low bit rates are presented. (13 references) (KRN)

Describes the easy collection procedures and classroom uses of live planarians. Suggests that the use of live animals in the classroom will allow students to observe different biological processes exhibited by living organisms. (ZWH)

Offers a unit of laboratory instruction for a general technology class that looks at ergonomics--the engineering science that seeks to prevent disorders caused by uncomfortable or stressful working conditions. The activity involves the measurement of body motions. (JOW)

Describes simple experiments to explore the variables and links to a theoretical approach. Using genuine data, develops an application to the drive mechanism for a lift in a deep mine shaft; poses follow-up questions. (ASK)

Focuses on three habits associated with personal values and attitudes, and one habit associated with social skills of doing science. Illustrates four habits of mind, first through a story of modern scientific investigation, then as the basis of school laboratory science experience. Discusses implications related to integration of these four habits…

Describes a unit of laboratory work which was unusual in that the teacher's purpose was to develop students' understanding of the way scientific facts are established with little expectation that they would understand the science content involved in the experiments. The unit was very successful from both a cognitive and affective perspective.…

Provides an excerpt of Galileo's description of his inclined plane experiment. Describes the replication of Galileo's inclined plane experiment by students at Rice University (Texas) using an Internet site called the Galileo Project; then describes the authors' replication of the Project. (AEF)

To test the effect of less-frequent interviews on data quality in longitudinal surveys, event history data from the National Longitudinal Survey of Youth 1979 regarding welfare and employment were analyzed. Due to the longer recall period, respondents failed to report short spells of welfare, employment, and unemployment. (SK)

Presents an activity on liquid chromatography that demonstrates the influence of mobile phase polarity on the separation of dyes with different solubilities. (YDS)

Introduces an inquiry-based lab design in which students try to find evidence on a particular problem. Investigates the effects of decreases in the pH level on the environment. Includes students' hypotheses and research results. (YDS)

Uses the Tobacco Hornworm to teach about the competition for limited resources and behavioral changes. Follows three stages during the experiment: (1) brainstorming and hypothesis building; (2) implementation; and (3) data reduction and presentation. (YDS)

Describes a demonstration in which a teacher or student can relight a blown out candle from a burning candle held about 2-3 centimeters directly above it. (SAH)

Describes a teaching program that shows how electrochemical principles can be conveyed by means of hands-on experiences of student-centered teaching experiments. Employs the readily available lead-acid cell and the simple aluminum-air cell. Discusses the batteries, equilibrium cell potential, performance comparison, current, electrode separation,…

Describes the construction of a Tesla coil using a car coil and presents various experiments for which it can be used. (JRH)

Both a control group and experimental group (23 students each) received a lecture on direct current circuits; the experimental group also participated in a lab using a device explaining an analogy for electric current. The experimental group's posttest scores were much higher, indicating that the analogical device helped overcome student…