Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The stage of growth at which three plant species, a grass, a legume and a cereal, absorbed initially non-exchangeable potassium (Kn) from two soils, a red podzolic and a krasnozem, was examined by sequential harvesting in a glasshouse experiment. Large amounts of Kn were removed from the red podzolic soil, which conta…
A method has been devised for studying the spontaneous polarization, dynamics of polarization reversal, and the molecular reorientation processes that occur in the bulk and surfaces of ferroelectric liquid crystals. These studies have been carried out by analyzing the current response to triangular- and square-wave fo…
Ontario Hydro has developed a computer program called FLOSHEET for simulation of hydrogen isotope and fusion fuel processing systems. The development of the program was initiated to provide support for the commissioning and operation of the Darlington Tritium Removal Facility (DTRF) at Ontario Hydro’s Nuclear Generati…
A.c. and d.c. conductivities of amorphous films of Ge—Sb–Se have been investigated for different Sb: Se ratios, keeping the Ge content constant at 20 at. %. The a.c. conductivity [sgrave](ω, T) in the frequency range 0•5-10•0 kHz is found to obey the law [sgrave](ω, T) = Aω3. The exponent s is found to decrease with i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemisorption on the microsurface of metal clusters: activation barriers and chemical reactions for carbon monoxide, nitrogen, oxygen, and methane on aluminum clusterMartin F. Jarrold and J. Eric. BowerCite this: J. Am. Chem. Soc. 1988, 110, 20, 6706–6716Publication Date (Pr…
The erosion wear and posterosion strength properties of Al 2 O 3 containing 10 vol% ZrO 2 were determined as a function of the kinetic energy of the impacting sharp particles. Samples were prepared with three different surface treatments to obtain different amounts of tetragonal zirconia on the surface. With all three…
Abstract Hydroxy‐interlayered vermiculite (HIV) from a Quartzipsamment, a Haplaquod, and a Paleudult from Florida was studied to determine levels of nonexchangeable K associated with this mineral. Mineralogy was characterized by x‐ray diffractometry (XRD) and thermal analysis. A scanning electron microscope equipped w…
Abstract The change in ring current of octaethylporphyrin, meso ‐tetraphenylporphyrin and phthalocyanine cobalt(III) complexes with axial amine ligands was studied using a double dipole network model. The porphyrin ring current was found to be highest in octaethylporphyrin but decreased by 5% in meso ‐tetraphenylporph…
Hydrogen absorption-desorption properties of some uranium-rich alloys were studied to develop an advanced material for temporary tritium storage. The characteristics of U-33.3at%Zr were analogous to those of U-69.7at%Zr, while the durability to powdering was reduced according to a decrease of zirconium content. The U-…
A number of facilities have been either constructed or are operating to extract tritium from the heavy water moderator systems of nuclear reactors. However it is expected that most fusion reactor concepts would require the recovery of tritium from light water coolant or blanket systems. This paper highlights the signi…
Over 50 variously substituted 5-alkyl-2-phenylpyrimidines have been synthesized. The effect of the presence of an additional olefinic double bond in the terminal position of the alkoxy chain or of a trans-1,4-disubstituted cyclohexane ring on the liquid crystal transition temperatures of these systems has been studied…
Abstract A study of the transport of the dichloromethane in neat poly(aryl‐ether‐ether‐ketone) (PEEK) samples with thicknesses from 0.08 to 3.0 mm with different morphologies was conducted at 35°C. Both sorption and desorption of the solvent were studied. Thermal annealing was used to vary the sample morphology, and d…
In an aircraft fuel, microbial contamination creates serious corrosion problems. The wing tank bottom and sides are affected by the growth of a biological sludge associated with the condensed water. The behavior of the AA(1) 7075 Al alloy in a culture of the principal contaminant, the fungus Cladosporium resinae, is d…
In this paper we describe the effect of oxygen-reactive ion-beam etching of a polyimide film to enhance its adhesion to an overlying, subsequently deposited copper film. The adhesion strength of the copper to the polyimide could be increased by as much as a factor of 25 as a result of the etching. Near the etching con…
Authigenic smectite dominates the silicate mineralogy of sediments underlying the hot brine pools of the Atlantis II Deep geothermal system in the Red Sea. Chemical compositions for monomineralic smectite fractions separated from three different facies give formulae that possibly distinguish three smectite species, on…
Abstract Exposure of polytetrafluoroethylene (PTFE) to MgKα x‐rays (1253.6 eV) for times as short as 10 min is observed to lead to permanent radiation hardening toward chemical etching. X‐ray‐dosed surfaces are visibly less etched, and the loss of F is over a factor of 2 smaller. For PTFE itself, the x‐ray photoelectr…
Abstract Symmetrically substituted octaalkyl- and octaarylporphyrins are readily prepared by the reduction of 2-ethoxycarbonyl-3,4-diarkyl (or diaryl)pyrroles with LiAlH4 followed by treatment with acetic acid and oxidizing agents.
The postirradiation fracture toughness responses of Types 316 and 304 stainless steel wrought products, cast CF8 stainless steel, and Type 308 stainless steel weld deposit were characterized at 427°C using JR curve techniques. Fast neutron irradiation of these alloys caused an order-of-magnitude reduction in Jc and tw…
Continuing advances in hardware and software have improved both the speed and the range of computations that can be made to simulate high resolution electron microscope (HREM) images from various structures. Use of image display systems and array processors have made the image simulation procedure much more interactiv…
Physical interactions between pyridoxal kinase and aspartate aminotransferase were detected by means of emission anisotropy and affinity chromatography techniques. Binding of aspartate aminotransferase (apoenzymes) to pyridoxal kinase tagged with a fluorescent probe was detected by emission anisotropy measurements at…