Materials Literature
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The bicarbonate ion has been implicated as a causative agent in iron chlorosis induced by high moisture in calcareous soils. Our studies have demonstrated a correlation between soil solution bicarbonate and chlorosis in soybeans in fields in western Minnesota and under growth chamber conditions. In the growth chamber…
Abstract Previously we reported differences in nutrient availability of desert grassland soils under mesquite [ Prosopis juliflora (Schwartz) DC] trees and adjacent open areas. In a related study conducted at that same time (1967), several mesquite trees were removed to measure shading effects. Since then about half o…
The crystallization of MgO‐Al 2 O 3 ‐SiO 2 ‐ZrO 2 glasses at 1000°C was studied. Isothermal heat treatments of a cordierite‐based glass (2MgO.2Al 2 O 3 .5SiO 2 = Mg 2 Al 4 Si 5 O 18 ) with 7 wt% ZrO 2 produced surface crystallization of α‐cordierite and tetragonal ZrO 2 ( t ‐ZrO 2 ). These phases advanced into the gla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain conformation and solubility of associating polymersM. E. Cates and T. A. WittenCite this: Macromolecules 1986, 19, 3, 732–739Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March 1986https://pubs.acs.org/doi/10.10…
Abstract The mechanical properties of crosslinked polyethylene were studied in an extended range of test conditions in order to determine the recommended service conditions for articles made of crosslinked polyethylene. On the other hand, this study can clarify the advantages of crosslinked polyethylene against the un…
Both high-resolution heat-capacity and tilt-angle measurements have been carried out near the smectic-A--chiral--smectic-C transition of p-(n-decyloxy)benzylidene-p-amino-(2-methlbutyl)cinnamate (DOBAMBC). The extended mean-field theory, suggested by Huang and Viner, for the smectic-A--smectic-C (or chiral--smectic-C)…
The effect of grain size on core loss and permeability was studied in three heats of silicon-free motor lamination steel. Grain sizes in the final test specimens ranged from 7 to 1360 µm. The core loss and permeability were measured at 10 and 15 kG ac, and 15 kG dc. Regression equations were constructed which took acc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic reactions of metalloporphyrins. 1. Catalytic modification of borane reduction of ketone with rhodium(III) porphyrin as catalystYasuhiro. Aoyama, Takamichi. Fujisawa, Hiroo. Toi, and Hisanobu. OgoshiCite this: J. Am. Chem. Soc. 1986, 108, 5, 943–947Publication Date…
The phenomenological theory of martensite crystallography was applied to the tetragonal‐monoclinic transformation in zirconia. Operation of variants of the lattice deformation can lead to a near‐twin orientation relation between different regions of a transformed particle, and if these regions are in the form of plate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-diffusion in branched polymer meltsCraig R. Bartels, Buckley Crist Jr., Lewis J. Fetters, and William W. GraessleyCite this: Macromolecules 1986, 19, 3, 785–793Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Published inissue 1 March…
A new form of coordination of the versatile ligand hexathia[18]crown-6 is found in the title compounds: Pd or Pt is coordinated to four S atoms in a square planar fashion; only long range weak axial interactions are observed with the two remaining S atoms of the macrocycle. That is, the macrocycle does not behave like…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and chemical properties of 1,3-cyclodisiloxanesMichael J. Michalczyk, Mark J. Fink, Kenneth J. Haller, Robert West, and Josef MichlCite this: Organometallics 1986, 5, 3, 531–538Publication Date (Print):March 1, 1986Publication History Published online1 May 2002Pub…
Wrinkles in six aged persons (67-82 years of age) have been investigated by light microscopy (LM) and scanning electron microscopy (SEM). There are two types of wrinkles. One is a deep wrinkle which develops on the sun-exposed skin and does not disappear on stretching (permanent wrinkle). The LM and SEM showed less el…
Abstmct-There is little or no definitive data in the literature that addresses the question of the possibility of adverse bioeffects in a single biological cell due to diagnostic ultrasound. A formula is derived that predicts the conditions that will produce transient acoustic cavitation on the scale of a single biolo…
Abstract Fine clay, coarse clay, and silt fractions of four Bangladesh soils were studied using XRD, ion exchange, and selective dissolution techniques. Constants for the XRD intensity-weight proportion relationships were derived using these techniques. Smectite and mica were found to be dominant in Batra and Ghior so…
Abstract A kinetic study of crystallization of fractions of poly(ethylene oxide)s between 3500 and 5,000,000 MW and their mixtures from the melt by differential scanning calorimetry and optical microscopy is reported. For the fractions the crystal growth rate is inversely dependent on the logarithmic molecular weight.…
The tetragonal ( t ) and cubic ( c ) ZrO 2 solid solutions in two‐phase ZrO 2 ‐8 wt% Y 2 O 3 ceramics have low and high solute content, respectively. Annealing samples sintered at 1600°C between 700° and 1400°C requires a change in the volume fraction of the coexisting phases, as well as their equilibrium Y 2 O 3 cont…
In order to probe the nature of the reactive site generated by acoustic cavitation, several new chemical dosimeters have been de- veloped and the effects of physical conditions on their yields have been explored. Specifically, the effects of solution vapor pressure and dosim- eter vapor pressure on sonochemical reacti…
This paper reviews work performed in the author’s laboratory on the roles that corrosion products play in corrosion and materials degradation processes. Subject areas include the following: (1) wedging action, in which the tensile stresses required for crack propagation are generated by the formation of solid corrosio…
Annealing of ZrO 2 ‐toughened Al 2 O 3 (ZTA) at elevated temperatures causes growth of both the intergranular ZrO 2 particles and the Al 2 O 3 “matrix” grains. Exaggerated (“breakaway”) grain growth occurs in some, but not all, specimens. Analytical electron microscopy of two ZTA's, both of which contained a continuou…