Low-temperature embrittlement of Ti-6Al-4V and Inconel-718 by high pressure hydrogen

Notched specimens of titanium alloy and Inconel-718 exhibit little reduction of notch strength at certain low temperatures under 2000 lb/sq in. hydrogen, unnotched specimens are not embrittled at these temperatures. The degree of Inconel-718 embrittlement is lower than earlier observations under 1000 lb/sq in. hydrogen

Influence of gaseous hydrogen on metals

Tensile, fracture toughness, threshold stress intensity for sustained-load crack growth, and cyclic and sustained load crack growth rate measurements were performed on a number of alloys in high-pressure hydrogen and helium environments. The results of tensile tests performed in 34.5 MN/m2 (5000 psi) hydrogen indicated that Inconel 625 was considerable embrittled at ambient temperature but was not embrittled at 144 K (-200 F). The tensile properties of AISI 321 stainless steel were slightly reduced at ambient temperature and 144 K (-200 F). The tensile properties of Ti-5Al-2.5 Sn ELI were essentially unaffected by hydrogen at 144 K (-200 F). OFHC copper was not embrittled by hydrogen at ambient temperature or at 144 K (-200 F)

Results of electroencephalographic examina- tions under the influence of vibration and centrifuging in the monkey

Electroencephalographic examinations of monkeys under influence of vibrations and centrifugin

Influence of gaseous hydrogen on metals Interim report

Gaseous hydrogen embrittlement in Inconel 718, Inconel 625, AISI 321 stainless steel, Ti-5Al-25Sn ELI, and OFHC coppe

Analysis of baseline and Gemini flight GT-7 EEG data with specification of on-line computing requirements

Analysis of baseline and Gemini GT-7 ELECTROENCEPHALOGRAM data with specification of on-line computing requirement

A High-Resolution Rotation Curve of NGC 6822: A Test-case for Cold Dark Matter

We present high resolution rotation curves of the local group dwarf irregular galaxy NGC 6822 obtained with the Australia Telescope Compact Array. Our best curves have an angular resolution of 8'' or 20 pc and contain some 250 independent points. The stellar and gas components of NGC 6822 cannot explain the shape of the curve, except for the very inner regions, and NGC 6822 is consequently very dark matter dominated. There is no evidence for the presence of a steep density cusp down to scales of ~20 pc, contrary to the predictions of Cold Dark Matter.Comment: Accepted for publication in MNRA

Annual Production of Creek Chub and Southern Redbelly Dace in a Small Woodland Stream

Author Institution: Illinois Natural History Survey Laboratory and Department of Biology, Lakehead UniversityThe annual production of the creek chub, Semotilus atromaculatus, and southern redbelly dace, Phoxinus erytbrogaster, was measured in a small headwater stream in southeastern Ohio. Creek chub annual production was 13.60 g • m~2 per yr, and P/B was 1.16. Dace annual production was 2.77 g • m~2 and P/B was 1.82. Even though the stream was acidic (pH 6.3) and infertile, fish production compared favorably with that of small alkaline streams. Considerable production within allochthonous food chains probably overrides the effects of low in-stream fertility

Movements of the Creek Chub in a Small Ohio Stream

Author Institution: Illinois Natural Survey Laboratory ; Lake Head UniversityCreek chub movements were monitored in a small stream in the spring and summer of 1972 to determine the magnitude of seasonal changes in distribution. A large percentage of the adult chubs moved upstream between late April and mid-May, but distances traveled by individuals were generally less than 300 m. Immature chubs moved upstream throughout the spring and summer, the catch being predominantly 2 and 3 year old fish in May and early June, and 1 and 2 year old fish in late June and July. Upstream movement of all but young-of-the-year chubs greatly exceeded downstream movement. Some young-of-the-year fish drifted downstream passively. Large population shifts, associated with the exodus of fish from 2 beaver ponds, had implications for estimation of population size, mortality and other population parameters

Electroencephalographic baselines in astronaut candidates estimated by computation and pattern recognition techniques

Electroencephalographic baselines in astronaut candidates estimated by computer and pattern recognition technique