Materials Literature
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An advanced analysis code, ARKAS_cellule, has been developed to determine the core distortion and the mechanical behavior of fast reactors. In this code, each hexagonal subassembly duct is represented by a folded thin plate structure divided into a user-specified number of shell elements so that the interduct contact…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A brief overview of two recent Si nanocrystal studies undertaken at the Australian National University is presented: recent work on hydrogen passivation of non-radiative defects and attempts to measure optical gain in waveguide structures. In the first study, a generalized treatment of hydrogen passivation and desorpt…
A method that uses underwater ultrasonic waves to promote sedimentation of fine particles dispersed in suspension, such as pigments, has been experimentally studied. Relationships among factors such as concentration of suspension before ultrasonic irradiation (0.1–1%), sound pressure (0–100 kPa) and irradiation time (…
As a part of our study on the mechanism of vulcanization we investigated a number of thiourea derivatives as secondary accelerators in the sulphur vulcanization of natural rubber. In the present study, the accelerator activity of a new binary accelerator system containing unsubstituted amidinothiourea viz. aminoiminom…
The Impact of Inorganic Scale Deposits and Their Removal on General CO2 Corrosion Rates and Corrosion Inhibitor Performance Robert Stalker; Robert Stalker Scaled Solutions Limited Search for other works by this author on: This Site Google Scholar Gordon M. Graham; Gordon M. Graham Scaled Solutions Limited Search for o…
The dynamics of self-organization in the q space of hexagonal pore arrays during anodic oxidation of aluminum and anodic etching of silicon for various times has been traced by means of the Fourier transform of micrographs obtained by scanning electron microscopy of the resulting porous surfaces of Al 2 O 3 and silico…
A new iron-niobium phosphate, Fe0.5Nb1.5(PO4)3, has been prepared and studied by X-ray diffraction, electron microprobe analysis, IR spectroscopy, and neutron powder diffraction. On the basis of X-ray powder data, it was found that the synthesized phosphate crystallizes into the sp. gr. R $$\bar 3$$ c and corresponds…
The results of the oxidation induction time (OIT) tests indicate that the determination of OIT involves a high degree of uncertainty in respect of the measured data, particularly for low OIT values. This would seem to show that OIT measurements have an extremely critical significance for quality control purposes or li…
In this paper, a simple original method and instrument for testing the thermal efficiency of garments containing PCM particles is described. The efficiency is characterized by the length of time that the garment can offer protection, when the effective thermal resistance is at least two times higher then the thermal r…
Abstract We have manufactured cathodoluminescent lamps equipped with field emitters composed of carbon nanotubes and nanosized graphite crystallites. The nanocarbon film material was obtained by chemical vapour deposition onto Si and Ni substrates and was used as grown in the vacuum light‐emitting devices. Various lig…
A critical issue in fabricating arrays of holes is to achieve high-aspect-ratio structures. Formation of ordered arrays of nanoholes in silicon nitride was investigated by the use of ultrathin hard etch mask formed by nickel pulse reversal plating to invert the tonality of a dry e-beam resist patterned by e-beam litho…
When ultrasonic waves are applied, the heat transfer at a heated surface in water increases markedly. The origin of this increase in heat transfer is thought to be due to the agitation effect from the microjets of cavitation and from acoustic streaming. The method in which four vibrators are used has the ability of fu…
Abstract An Fe-9Cr-2W-0.25V-0.07Ta-0.1C (9Cr-2WVTa) steel has a smaller prior-austenite grain size than this same composition without tantalum (9Cr-2WV) when the steels are given a similar heat treatment. Except for prior-austenite grain size, the microstructures of the steels are similar before irradiation, and they…
The dc conductivity of VN–PbO–TeO2 glasses with different mole percentages of VN, PbO and TeO2 has been measured in the temperature range 125–450 K. The conductivity of the glasses increases with increasing VN content for a fixed mole percentage of PbO. Neither Mott's variable-range hopping (VRH) model at low temperat…
The mechanisms responsible for phonon attenuation in glasses and in porous systems have been investigated. The acoustic attenuation has been measured by Brillouin light scattering using a Fabry-Pérot apparatus and a new ultraviolet spectrometer. In particular, melt-quenched vitreous silica (ρ = 2200 kg m−3), silica xe…
The crystal structure of getchellite, As 0.98 Sb 1.02 S 3.00 , from the type-locality (the Getchell mine, Humboldt County, Nevada), monoclinic, P2 1 /a, a = 11.949(3), b = 9.028(1), c = 10.130(2) Å, β = 116.15(1)°, V = 980.9(4) Å 3 , Z = 8, was solved by direct methods and refined with full-matrix leastsquares techniq…
Four kinds of carbon/carbon (C/C) composites, including the needled carbon fiber felt/the pyrolytic carbon (two different pyrolytic carbon microstructures), the chopped carbon fiber/the resin + pyrolytic carbon (PyrC), and the carbon cloth/PyrC, named as the composites 1#, 4#, 2#, and 3#, are prepared respectively. Ef…
Ultra-high temperature ceramics (UHTC) are of interest for hypersonic vehicle leading edge applications. Monolithic UHTCs are of concern because of their low fracture toughness and brittle behavior. UHTC composites (UHTCC) are being investigated as a possible approach to overcome these deficiencies. In this study a sm…
Abstract The effects of the content and size of the filler on the curing characteristics and mechanical properties of linoleum flour‐reinforced acrylonitrile‐butadiene rubber (NBR) composites are analyzed. The linoleum flour was obtained from wastes of linoleum production. The effects of this filler are compared with…