7,730 research outputs found
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
EMF/EMR reduces melatonin in animals and people
Melatonin is a vital natural neurohormone that regulates the daily circadian rhythm in
mammals. Melatonin is the most potent known antioxidant. At night the pineal gland’s
output of Melatonin rises and the Melatonin is carried by the circulation system throughout
the body, passing through the cell membrane and scavenging free radicals in the cell to
project the DNA. It also has many other vital functions involving assistance of the immune
system to maintain its immunocompetence, and it regulates slip activity including aspects
of REM sleep and sleep efficiency. Hints substances of activity at reduced melatonin
output causes many serious biological effects in humans and other mammals, including
sleep disturbance, chronic fatigue, DNA damage leading to cancer, cardiac, reproductive
and neurological diseases and mortality. Reduced melatonin is also associated with
arthritis, depression and suicide, seasonally affective disorder (SAD), miscarriage, sudden
infant death syndrome (SIDS), Schizophrenia, Alzheimer’s disease and Parkinson’s
disease. Multiple independent studies will have found that electromagnetic fields reduced
melatonin in animals, flesh of and human beings. The evidence includes correlations with
Geomagnetic Activity reducing human melatonin, through the Schumann Resonance
signal effect. The level of evidence exceeds the usual requirement for causal link. This
strongly suggests that melatonin production caused by electromagnetic fields and
radiation exposure contributes significantly to the allocation of many adverse health effect
rates in the community
- …