Materials Literature
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An analysis of fragmentation due to dynamic stress loading is presented which provides analytic functions for the distributions in fragment sizes. The analysis is restricted to one‐dimensional bodies under uniform tensile loading. Concepts of survival statistics are used to account for spatially random fracture nuclea…
Abstract Oxidation, cool flames and ignition in equimolar mixtures of acetaldehyde and oxygen have been studied in a well stirred, continuous-flow reactor (an open system), over temperatures from 450 to 625 K and pressures from 5 to 25 kN m-2. The reactor is a 500 cm3, spherical, glass vessel, ca. 10 cm in diameter, a…
Infrared dichroism measurements can be used to study the process-structure-property relations of a polymer provided the transition-moment angle and phase absorption characteristics of the individual absorption frequencies are known. The present study describes experimental procedures for determining these intrinsic fr…
<div class="htmlview paragraph">This paper presents a discussion of the stress-range fatigue-design concept, including the results for 77 welded and cold-formed steel-sheet specimens exposed to constant-amplitude stress cycles with stress ratios of 0.02 to 0.34. The test specimens were fabricated from steels wit…
The irradiation performance of injected thermosetting fuel rods is compared to that of standard pitch-based rods for test conditions exceeding current high-temperature gas-cooled reactor requirements. Thermosetting rods have processing advantages in that they can be carbonized freestanding without loss of shape, but s…
Introduction Although the soil as a corrosive environment is probably of greater complexity than any other environment, it is possible to make some generalisations regarding soil types and corrosion. It is necessary to emphasise that corrosion in soils is extremely variable and can range from the rapid to the negligib…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlavonoids of SullivantiaDouglas E. Soltis, Paula Neuman, Tom J. Mabry, Kathleen M. Kerr, and Gerald J. GastonyCite this: J. Nat. Prod. 1981, 44, 1, 50–52Publication Date (Print):February 1, 1981Publication History Published online1 July 2004Published inissue 1 February 1981…
Electrolytical charging tests on cubic face-centered materials with different nickel contents, on CuZn 30 and the cubic body-centered reference materials X 8 Ni 9 as well as on technically pure iron. Determination of the mechanical parameters of specimens after hydrogen charging, after hydrogen charging and tempering…
An extensive study was made of the mechanical properties of the polymer–leather composite materials reported in previous articles. Polymer was deposited into leather by both emulsion and bulk (or solution) polymerization. Either methyl methacrylate, n-butyl acrylate, or a fixed comonomer mixture of n-butyl acrylate an…
An exothermic transition is observed near 400°CC on thermal dehydration of highly crystalline AI 2 (SO 4 )3.16H 2 O, Al 2 (S0 4 ) 3 14H 2 O, and Al 2 (S0 4 ) 3 9H 2 O when the early stages of heating are carried out in vacuum. Amorphous or partially crystalline hydrates do not show the exotherm. No systematic relation…
Orthorhombic unit-cell constants for SrRE2O4 (RE = Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, In and Y) have been determined by refinement of X-ray powder diffraction data. Unit-cell volumes are plotted against the cube of the trivalent rare-earth ionic radius.
Abstract This modification of sodium sulfate exists between 200 ° C to 228 ° C. Single crystals of Na 2 SO 4 III are grown by metastable nucleation from aqueous solutions at 50 ° C. Sodium sulphate III is orthorhombic with space group Cmcm and cell constants a = 5.607 Å, b = 8.955 Å, c = 6.967 Å, Z = 4. The structure…
Abstract Crazing was investigated in two commercial polystyrene/polybutadiene block copolymers made by the Phillips Petroleum Co. and marketed under the trade names of KRO‐1 and KRO‐3 resins. The two block copolymers each with 23% polybutadiene (PB), have radically different microstructure and radically different craz…
Abstract The crystal structure of the alums, (NH 3 CH 3 )Al(SO 4 ) 2 · 12H 2 O and (NH 4 )Al(SO 4 ) 2 · 12H 2 O, has been determined and refined from X-ray and neutron diffraction data. The compounds crystallize cubic in space group Pa 3 ( Z = 4) with a 0 = 12.322(3) Å and a 0 = 12.242(1) Å respectively. The positiona…
The literature on the viscosity behavior of liquid crystals is reviewed with emphasis on the experimental results. These results are discussed in terms of the mesophase structure. Discussion of polymeric liquid crystals has been excluded since they have recently been reviewed.
The saturation induction Bs and the relation between Curie temperature Tc and crystallization temperature Tx were systematically studied for Co-rich (FeCo)100−y(SizB1−z)y systems with zero magnetostriction in the range of 20⩽y⩽30 and 0⩽z⩽0.6. With increasing metalloid content y, Bs and Tc decrease and Tx increases. Sm…
The temperature rise during the adiabatic polymerization of acrylamide in water has been used to characterize the kinetic parameters. Based on initial rate data, the following equation is obtained: where concentrations of monomer, persulfate, and bisulfite are in mole/kg, T is in K, and t is in min. The order with res…
Abstract An experimental and theoretical study was carried out to achieve a better understanding of bubble dynamics in foam extrusion through a converging die. For the experimental study, a number of converging channels were constructed of aluminum, with glass windows on both sides. Bubble dynamics in the flow channel…
X-ray and optical studies in the paper show that dodecyl benzene sulfonic acid and the mixtures of its sodium salt with (i) water and (ii) methane sulfonic acid exhibit the smectic A phase. Interference studies are described in the paper to establish the molecular orientation in the droplets and batonnets.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculated magnetic properties of some isomers of pyracyleneJ. A. N. F. Gomes and R. B. MallionCite this: J. Org. Chem. 1981, 46, 4, 719–727Publication Date (Print):February 1, 1981Publication History Published online1 May 2002Published inissue 1 February 1981https://doi.org…