1,529 research outputs found
Tensile creep-rate of pyrolytic carbon
Stress-change technique, combined with a graphical-interpolation analysis, yields data on the stress and temperature dependence of the creep rate over broad strain and stress or temperature ranges on as-deposited, substrate-nucleated, pyrolytic carbon
Tensile creep-rate studies on pyrolytic carbon
Tensile creep behavior of substrate-nucleated pyrolytic carbon at high temperature
Structure dependence of the diamagnetism of graphitizing carbons
Structure dependence of diamagnetism in pyrolytic carbon
Magnetic susceptibility of glassy carbon
Magnetic susceptibility of glassy carbon at room temperature with respect to magnetic field strength, heat treatment temperature, and high temperature tensile deformatio
Basal-plane metallography of deformed pyrolytic carbon
Cleavage technique is recommended over the normal polishing technique in preparing pyrolytic carbon for metallographic examination of basal-plane surfaces. After careful removal of torn basal-plane fragments and other cleavage debris with cellulose tape, the true structure is clearly revealed
Tensile and structural properties of glassy carbon
High temperature tensile strength of glassy carbons in helium atmosphere - mechanical propertie
Structural studies on carbon materials for advanced space technology. Part 1: Structure and oxidation behavior of some carbon/carbon composite materials
The microstructure and some microstructural effects of oxidation have been investigated for laminar carbon fiber cloth/cloth binder matrix composite materials. It was found that cloth wave is important in determining the macrostructure of the composites X-ray diffraction analysis showed that the composites were more graphitic than the constituent fiber phases, indicating a graphitic binder matrix phase. Various tests which were conducted to investigate specific properties of the material are described. It was learned that under the moderate temperature and oxidant flow conditions studied, C-700, 730 materials exhibit superior oxidation resistance primarily because of the inhibiting influence of the graphitized binder matrix
Is violation of Newton's second law possible?
Astrophysical observations (usually explained by dark matter) suggest that
classical mechanics could break down when the acceleration becomes extremely
small (the approach known as modified Newtonian dynamics, or MOND). I present
the first analysis of MOND manifestations in terrestrial (rather than
astrophysical) settings. A new effect is reported: around each equinox date, 2
spots emerge on the Earth where static bodies experience spontaneous
acceleration due to the possible violation of Newton's second law. Preliminary
estimates indicate that an experimental search for this effect can be feasible.Comment: 10 pages; minor changes to match the published versio
Metamaterial metal-based bolometers
We demonstrate metamaterial metal-based bolometers, which take advantage of
resonant absorption in that a spectral and/or polarization filter can be built
into the bolometer. Our proof-of-principle gold-nanostructure-based devices
operate around 1.5 \mum wavelength and exhibit room-temperature time constants
of about 134 \mus. The ultimate detectivity is limited by Johnson noise,
enabling room-temperature detection of 1 nW light levels within 1 Hz bandwidth.
Graded bolometer arrays might allow for integrated spectrometers with several
octaves bandwidth without the need for gratings or prisms and for integrated
polarization analysis without external polarization optics
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