Reviews the history of vacuum technology. Includes vacuum pump developments (mechanical, ion, and cyrogenic pumps), measurement techniques, the development of the American Vacuum Society, and electronics in vacuum technology. (JN)

Describes the features and operation of an inexpensive digital pH meter. Includes a schematic diagram of the pH meter and a parts list with cost and source of each part. (SK)

Describes a ripple tank demonstration that displays interference patterns responsible for producing beats and provides photographs of computer simulations of various beat interference patterns. Includes programs for the computer simulation and equations of constructive interference paths in beat interference patterns. (Author/SK)

Through cooperation among a number of provincial agencies to facilitate centralized management, coordination, and implementation, 100 microcomputers have been placed in British Columbia public school classrooms. Project rationale, psychological barriers, inservice field support for teachers, hardware and software acquisition and testing, and…

This article describes the development of a tool for evaluating printed nutrition materials on the basis of readability, stereotyping, use of instructional aids, format, and content. The tool is intended to evaluate prenatal nutrition materials for pregnant adolescents. (Author/SA)

Describes an experiment suitable for an instrumental analysis or quantitative analysis course. (BB)

Experimental and theoretical data are presented which verifies the existence of the hydronium ion. This existence was confirmed directly by x-ray and neutron diffraction in hydrochloric acid. Recommended is the abandonment of the erroneous hydrogen ion formulation and names such as proton hydrate. (BT)

Describes the construction of a versatile signal generator suitable for use in cyclic voltammetric experiments, which can also be adapted to a conventional dc polarograph by replacing its ramp source. (MLH)

Systematically reviewed the current status of outcome research. Specifically looked at trends in the publications sources, research focus, and methods of 365 counseling outcome studies. Results suggest that outcome research can provide a considerable knowledge base regarding numerous client concerns and various clinical interventions in…

Presents an activity that is part of a unit on topography and land masses in the earth science curriculum. Involves students learning about scientific inquiry, comparing a model with what it represents, making and interpreting scale drawings, learning how to use new instruments, and learning about computation and estimation. (JRH)

Using fourier transformation methods in nuclear magnetic resonance has made possible increased sensitivity in chemical analysis. This article describes these methods as they relate to magnetization, the RF magnetic field, nuclear relaxation, the RF pulse, and free induction decay. (CW)

Describes a program to provide a major improvement in the national instrumental analysis capability of Chinese universities and associated industries. Notes the network ended its first five years of operation with a sense of accomplishment, but found its perspective much different than at the startup. (MVL)

Addresses solution nonmetal determinations on a fundamental level. Characterizes research in this area of chemical instrumentation. Discusses the fundamental limitations of nonmetal atomic spectrometry, the status of nonmetals and atomic spectroscopic techniques, and current directions in solution nonmetal determinations. (CW)

Presents a lesson plan for keyboard instruction excerpted from "Strategies for Teaching Middle-Level and High School Keyboard" (compiled by Martha Hilley and Tommie Pardue. Reston, VA: Music Educators National Conference, 1996). Provides objectives, materials, required background knowledge, procedures, evaluation indicators, and…

Explores factors that can explain the rapid evolution of the water sciences. Discusses the investment in measuring systems that allow characterizations of water properties and the expansion of mathematical and systemic approaches to the interpretation of data. Contains 23 references. (DDR)