PCSIR Seminar / Workshop

"In collaboration with Université de Sherbrooke, Québec, Canada

Dyestuff production (Pakistan) : general report, Jan. 1989-Dec. 1991

A collaborative project between ACR Centre, PCSIR Laboratories Complex, Lahore, Pakistan, and Dépt. de génie chimique, Université de Sherbrooke, Sherbrooke, Québec, Canad

Technical report on dyestuff production (Pakistan), Jan. 1989-Dec. 1990

A collaborative project between ACR Centre, PCSIR Laboratories Complex, Lahore, Pakistan and Dépt. de génie chimique, Université de Sherbrooke, Sherbrooke, Québec, Canad

A mathematical model for the impedance of cavity-backed slot antennas /

A mathematical model is derived which relates the impedance of a cavity-backed slot antenna to that of an identical slot which is free to radiate on both sides of a large ground plane. The model, which uses empirical constants from a previous experimental investigation, provides a continuously variable function for the impedance of the cavity-backed slot. This function is then compared with the previously found experimental values and approximate solution using variational techniques. (Author)."Prepared fro Air Force Cambridge Research Laboratories, Air Force Systems Command, United States Air Force, Bedford, Massachusetts 01730.""Contract Monitor, Philipp Blacksmith, Microwave Physics Laboratory.""Contract F19628-74-C-0060.""Gordon McKay Laboratory.""October 1973.""Scientific Report No. 1."Includes bibliographical references (page 45).A mathematical model is derived which relates the impedance of a cavity-backed slot antenna to that of an identical slot which is free to radiate on both sides of a large ground plane. The model, which uses empirical constants from a previous experimental investigation, provides a continuously variable function for the impedance of the cavity-backed slot. This function is then compared with the previously found experimental values and approximate solution using variational techniques. (Author).Mode of access: Internet

Scattering by imperfectly conducting spheres /

The theory of scattering by an imperfectly conducting, dielectric or plasma sphere is reviewed briefly. Numerical values of the back scattering and forward scattering cross sections of spheres are given over wide ranges of the radius, the conductivity, and the permittivity including both positive and negative values. The angle of the electric field in the forward and backward directions is also represented. (Author).Prepared for Air Force Cambridge Research Laboratories, United States Air Force, Bedford, Massachusetts.Contract Monitor: Philipp Blacksmith, Microwave Physics Laboratory.Contract F19628-68-C-0030, Project 5635, Task 563502, Work Unit 56360201, Scientific Report No. 9."August 1970."Includes bibliographical references (pages 33-34).The theory of scattering by an imperfectly conducting, dielectric or plasma sphere is reviewed briefly. Numerical values of the back scattering and forward scattering cross sections of spheres are given over wide ranges of the radius, the conductivity, and the permittivity including both positive and negative values. The angle of the electric field in the forward and backward directions is also represented. (Author).Mode of access: Internet

Comparison of three modes of instruction for the operation of a complex oscilloscope /

A field experiment was conducted to compare the effectiveness of three modes of instruction in the use of the AF 1807 oscilloscope (Tektronix 545A). Skilled electronic technicians of the U.S. Air Force Security Service served as subjects. One group was trained with an audio-visual instructional program, and a second group with a book form of the same program. The program combined verbal instruction and responses with practice on an oscilloscope. A third group was trained in the manner normally used at the school where the study was conducted. Analysis of variance on test scores indicated superiority of both forms of the program over the conventional instructions with no difference in effectiveness between programs. Electronic aptitude, as measured by the Airman Qualifying Examination, correlated significantly with test scores for the conventionally trained group and for all subjects together. (Author)."March 1967."A field experiment was conducted to compare the effectiveness of three modes of instruction in the use of the AF 1807 oscilloscope (Tektronix 545A). Skilled electronic technicians of the U.S. Air Force Security Service served as subjects. One group was trained with an audio-visual instructional program, and a second group with a book form of the same program. The program combined verbal instruction and responses with practice on an oscilloscope. A third group was trained in the manner normally used at the school where the study was conducted. Analysis of variance on test scores indicated superiority of both forms of the program over the conventional instructions with no difference in effectiveness between programs. Electronic aptitude, as measured by the Airman Qualifying Examination, correlated significantly with test scores for the conventionally trained group and for all subjects together. (Author).Research supported by Aerospace Medical Division, Air Force Systems Command, United States Air Force; report completed in part by Applied Science Associates, Inc. under contract no.Mode of access: Internet