Describes the process of osmosis from its discovery by Nollet in 1848 to modern applications. Uses experimental descriptions, illustrations, and photographs to explain osmosis. Discusses the technology of producing perfect filters and their applications in reverse osmosis to purify salt water and to filter blood in kidney machines. (PR)

Utilized an experimental design structure across 4 scientific contexts which tested 18 boys and 18 girls who were closely matched for ability levels and curriculum background. No gender differences were detected in the scientific contexts of observation, reporting, or planning skills, and there was no differential performance on the use of…

Presents activities that utilize piezoelectric film to familiarize students with fundamental principles of electricity. Describes classroom projects involving chemical sensors, microbalances, microphones, switches, infrared sensors, and power generation. (MDH)

Much research has been compiled on service-learning, its benefits, and its influence on intrinsic motivation. Service-learning has been used as a method of teaching content in science education, civic education and history, business and marketing education, as well as other areas. However, a review of literature found no service-learning studies…

Produced by the Search for Extraterrestrial Intelligence (SETI), Project Haystack presents scenarios that depict various aspects of the search for extraterrestrial intelligence. Students conduct hands-on and minds-on activities while exploring what it means to send and receive a message across interstellar distances. Students explore and map vast…

This monograph is one in a series of analytical reports presenting findings from the National Science Foundation's 1989-90 National Survey of Academic Research Instruments and Instrumentation Needs. This report documents current status and recent trends in the amounts, costs, and kinds of academic research equipment in seven major…

This document is intended to serve as a resource for state societies of the National Society of Professional Engineers (NSPE) in the preparation of action plans targeted at legislative changes in support of engineering education. The results of action taken recently by various state legislatures in response to NSPE state society activities are…

The target of difficulty of the Educational Technology Center (ETC) Heat and Temperature Group is basic thermal physics, particularly the differentiation between heat and temperature. High school teachers often find that thermal concepts are very difficult for their students to master and attribute students' difficulties at least in part to the…

This document introduces fifth-grade children to the microscopic world, to the instruments needed to make it accessible, and to the appearance and structure of cells in nonliving as well as living things. Aims of the unit include providing children with an instrument which extends their senses in a radical manner, and leading them in using this…

Compiled to introduce the dental assisting student to various techniques used in the dental office and to present theoretical information essential for the student's professional development, this laboratory guide consists of three units of instruction. The first unit is an introduction to dental assisting and contains five topics of study. The…

New group-discussion language laboratories and the implementation of a subject-language interaction method are described. The use of the language equipment emphasizes free oral intercourse and allows the subject and language or other didactical questions to be dealt with in turns, rather than simultaneously. The laboratories allow students' 14…

A SERIES OF SEVEN EXPERIMENTS TESTED THE RELATIVE EFFECTIVENESS OF USING FOUR TYPES OF LANGUAGE LABORATORY EQUIPMENT FEATURING INACTIVATED OR ACTIVATED FEEDBACK (IF OR AF) OR LONG OR SHORT DELAY PLAYBACK (LD OR SD) IN LEARNING TO PRONOUNCE FRENCH. AFTER PRELIMINARY EXPERIMENTATION, THREE REPLICATION EXPERIMENTS WERE CONDUCTED WITH PAID JUNIOR…

Research described in this report compares the relative achievement of three groups of secondary school students beginning language instruction in German, French, and Spanish using the electronic classroom, the record-playback laboratory, and the broadcast language laboratory with that of a control group. The second major area of research…

This is the first edition of a new directory of the audiovisual industry listing producers and distributors of equipment and services. Also listed are organizations, conventions, film festivals, and publications concerned with the new media: films, filmstrips, slides, film loops, tapes, transparencies, maps and globes. Published in 1969, this…

Language laboratory effectiveness in secondary schools and related research are discussed. Criteria for five elements determining the laboratory's effectiveness are described: (1) the teacher, (2) the teaching materials, (3) the testing and grading programs, (4) the student practice sessions, and (5) the equipment. Some general remarks are made…