Development of a 60 kW alternator for SNAP-8

Design and development testing of 60 kW alternator for SNAP

NASA/GE Energy Efficient Engine low pressure turbine scaled test vehicle performance report

The low pressure turbine for the NASA/General Electric Energy Efficient Engine is a highly loaded five-stage design featuring high outer wall slope, controlled vortex aerodynamics, low stage flow coefficient, and reduced clearances. An assessment of the performance of the LPT has been made based on a series of scaled air-turbine tests divided into two phases: Block 1 and Block 2. The transition duct and the first two stages of the turbine were evaluated during the Block 1 phase from March through August 1979. The full five-stage scale model, representing the final integrated core/low spool (ICLS) design and incorporating redesigns of stages 1 and 2 based on Block 1 data analysis, was tested as Block 2 in June through September 1981. Results from the scaled air-turbine tests, reviewed herein, indicate that the five-stage turbine designed for the ICLS application will attain an efficiency level of 91.5 percent at the Mach 0.8/10.67-km (35,000-ft), max-climb design point. This is relative to program goals of 91.1 percent for the ICLS and 91.7 percent for the flight propulsion system (FPS)

Report on the machinability of Aircraft Steel D. T. D. 331 (B. S. S. 99) using H. S. S. tools

In all the tests conducted the results obtained were reasonably consistent. High Speed Steel Tools containing 18% Tungsten and 5% Cobalt were used throughout. The same tool was used as far as possible to minimise the variables entering the tool life tests ... [cont.]

American teaching and practice of industrial engineering and management

In June 1954 a small mission, comprising T.B.Worth, A.M.I.E.E., M.I.Prod.E., F.R.S.A., Principal Senior Lecturer in Production Engineering and Assistant Head of the Department of Mechanical and Production Engineering at Birmingham College of Technology, K.J.Shone, M.A. (Cantab),A.M.I.Mech.E., M.I.Ear.E., M.E.I.C., Head of Department of Industrial Administration, Royal Technical College, Glasgow, and the author, visited the United States of America to "observe and gain experience of American methods of training in Industrial Engineering and Management both in universities and industrial plants". Subsequently, in September, D.M,Williams, Ph.D., B.Sc., (H.M.I.) joined the mission, which returned in November 1954. Each member investigated different aspects and separate reports are being presented. This report deals mainly with education in Industrial Engineering. Other Sections, dealing with education in Management, Industrial Engineering and Management in Industry, Research and Consultancy will be presented subsequently by the author. Education in Industrial Engineering in the U.S.A. laid emphasis on the need for sound education in the bagic and engineering sciences prior to the study of Industrial Engineering subjects. Considerable attention was paid to the economic aspects of industry and subjects such as Engineering Economic Analysis were prominent. Awareness of the impact of new developments in the industrial engineering field was also evident and curricula were being revised to introduce subjects such as Electronic Theory into the electrical programme, and the application of Operations Research techniques'to the mathematics programme. The value of formal education in Industrial Engineering was acknowledged by most industrialists, who were absorbing I.E. graduates at a rate exceeding 1500 per annum.- In 1954 there were approximately 8,000 students enrolled in. I.E. courses. A comparison of equivalent courses in Great Britain showed that less than 50 students were enrolled. The comparison also revealed the inadequacy of the Higher National Certificate courses in Production Engineering, and a strong plea is made for more facilities for students to take Higher National Diploma courses in Production Engineering

A new approach to the prediction of tool wear

Tool life is of major concern for economical production in the metal cutting industries and a simple method of predictive the tool wearability of materials would be of considerable value in enabling optimum cutting conditions to be determined. It has been shown that tool life for minimum cost Der piece = - 1)K where ‘n’ is the exponant, in the speed/life relationship VT - 11 = C. Since I n' is substantially constant for a given tool material and chip thickness, and K is constant for given operating conditions then the life of the tool (T) has an unique value under these circumstances. Also since tool life (T) will be determined by a specific magnitude of tool wear, a simple method by which the time to arrive at this criterion could be predicted would be very useful. In the experimental work to be described it has been possible from simple cutting tests to predict tool wear over a limited range of conditions— Much more extensive research is required to establish the range of the technique

Lethal Temperatures of Diapausing \u3ci\u3eBathyplectes Curculionis\u3c/i\u3e (Hymenoptera: Ichneumonidae) a Parasite of the Alfalfa Weevil (Coleoptera: Curculionidae)

Seasonally acclimatized diapausing larvae of Bathyplectes curculionis (Thomson) were exposed to extreme hxgh and low temperatu~es to determine lethal temperatures for this stage of the parasite. The possible effects of relative humidity on high temperature mortality, mortality induced by repetitive exposures to sublethal temperatures, and differential survival between sexes, were also measured. The upper lethal temperature for summer larvae was 60°C (LDSo from 2 to 4 h), and the lower lethal temperature for winter larvae was -25°C (LDSo from 0 to % h). Summer larvae showed significantly increased mortality with repetitive exposures to sublethal temperatures (55OC) whereas winter larval mortality did not increase significantly with repetitive exposures to sublethal temperatures (-20°C). In winter experiments in which the sex of the emerging adult could be measured, no significant difference in survival was found between the sexes. Our results, in conjunction with published field data, strongly suggest that heat kill in the summer may be a significant mortality factor in warmer areas of the parasite\u27s range

Evidence in support of the a priori hypothesis that electromagnetic radiation across the spectrum is a Ubiquitous Universal Genotoxic Carcinogen.

By October 2001 Dr Cherry had concluded that there was very strong evidence that electromagnetic radiation across the spectrum is a Ubiquitous Universal Genotoxic Carcinogen. The evidence is strong from multiple independent studies showing that from extremely low-frequency to microwave radiation signals and fields damage DNA. Epidemiological studies confirm this by showing that increased cancer in many body organs because the whole body is exposed, from residential studies from power ELF frequencies and radio frequencies causing increased cancer rates and from a large body of studies showing cardiac, reproductive and neurological health effects