Materials Literature
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Vibrational spectroscopic methods were used to study the Si-O bond character in silicates with different complex anions and crystal structures. The following calcium silicates were examined: Ca,(SiO 5 ), γ-Ca 2 (SiO 4 ), β-Ca 2 (SiO 4 ), Ca 3 (Si 2 O 7 ), Ca(SiO 3 ), and Ca(Si 3 O 3 ). The band assignments in IR and R…
Ultra-high strength polyethylene filaments taken from a single spool of yarn were examined for strain rate and gauge length effects. As noted in previous research, high strength polyethylene exhibits pronounced strain rate effects that may be seen in strength changes, stress-strain behavior, and and topography of the…
Fracture toughness of ZrO 2 ‐toughened alumina could he increased by macroscopic interfaces, such as those existing in laminated composites. In this work, tape casting was used to produce A/A or A/B laminates, where A and B can be Al 2 O 3 , Al 2 O 3 /5 vol% ZrO 2 , and Al 2 O 3 /l0 vol% ZrO 2 . An increase of toughne…
The Naval Sea Systems Command has recently certified a lower-cost alternative steel to the HY-80 steel presently used in construction of naval surface ships. This alternative steel is based on the commercial development of high strength low alloy (HSLA) steels originally directed to the offshore oil exploration platfo…
Psychophysical detection thresholds for vibration were measured at the thenar eminence and volar forearm using a 0.008-cm2 (1.0-mm-diam) contactor. Measurements were made at 14 sinusoidal frequencies between 12 and 500 Hz at six skin temperatures between 15 degrees and 40 degrees C. The results are consistent with the…
The effect of the difference between slip and rigid boundary conditions on the value of the ultrasonic wave reflection coefficient from an interface is used to study properties of adhesively bonded interfaces. It is shown that changes of the amplitude of the reflected ultrasonic wave during adhesive curing occurred si…
Abstract The electrical conductivity of alkylthio-substituted tetrathiafulvalene (TTCn-TTF) single crystal has been measured in a vacuum of 10−4 Pa with the two probe method. The room temperature dark conductivity of TTC10-TTF reaches 10−5 S cm−1, a value that is extraordinarily high compared with those of other organ…
Abstract Burial diagenetic reactions of di- and trioctahedral clay minerals were compared in Brazilian offshore, basinal sediment sequences of Cretaceous age. Originally dioctahedral smectite-rich shales of three basins—Potiguar,Ceara, and Ilha de Santana—exhibited the classical smectite-to-illite burial pattern. Trio…
There are many published values for the concentrations of lime and silica in the aqueous phase which is in contact with calcium silicate hydrate. These have been collected, carefully analyzed, and found often to be apparently inconsistent. When, however, they are interpreted as having come from an aqueous phase which…
Laser Raman spectroscopy (LRS) has been applied for the detection and characterization of thin corrosion films formed on iron in air at a temperature range from 100 to 150 C. In situ ellipsometric measurements have also been conducted for quantitative estimations of the film growth kinetics. It is found that (1) the o…
Abstract Covalently crosslinked liquid crystalline networks with elastic properties were prepared in isotropic solution from linear liquid crystalline polymers. As linear precursors for the networks were used: (i) polymers with the mesogenic groups in the side groups (polyacrylates and polymethacrylates), (ii) polymer…
Abstract Chemical data from three different series of diagenetic illite/smectites (I/S), analyzed statistically by two regresion techniques, indicate that the content of fixed-K per illite layer is not constant, but ranges from ~0.55 per O 10 (OH) 2 for illite layers in randomly interstratified I/S (R=0; >50% smect…
The brain uptake of L-[18F]fluorodopa was measured by positron emission tomography in a healthy male volunteer both under fasting conditions and during intravenous amino acid loading. A significant reduction of tracer uptake into the brain was demonstrated with amino acid loading. This finding represents the first dir…
Tetragonal zirconia polycrystals were produced from high‐purity powders containing 1.5 to 5.0 mol% Y 2 O 3 by cold isostatic pressing and sintering, hot‐pressing, and hot isostatic pressing. The mechanical properties and microstructures of these resulting materials were examined, with emphasis on the relation between…
A tight-binding model in one dimension with an incommensurate potential ${V}_{n}=\ensuremath{\lambda}cos(2\ensuremath{\pi}\ensuremath{\sigma}n)$ is investigated. It is found that at the critical point of the localization transition $\ensuremath{\lambda}=2$, there is a finite range of scaling indices ${\ensuremath{\alp…
This is the first comprehensive check-list of the diatoms of the British Isles to cover all currently reported taxa from freshwater, brackish and marine habitats. It contains a classification of the genera in order of families, followed by a complete list of species and lower taxa set out in alphabetical order within…
We present experimental results on the viscosity of supercooled aqueous solutions of lithium chloride. The viscosity scales as (T-${T}_{0}$${)}^{\ensuremath{\mu}}$ with \ensuremath{\mu}=-2.08 over a large temperature range. Data on other systems show that both the power-law behavior and the approximate value of the ex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilation of polymers by sorption of carbon dioxide at elevated pressures. 1. Silicone rubber and unconditioned polycarbonateG. K. Fleming and W. J. KorosCite this: Macromolecules 1986, 19, 8, 2285–2291Publication Date (Print):August 1, 1986Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered bicontinuous double-diamond structure of star block copolymers: a new equilibrium microdomain morphologyEdwin L. Thomas, David B. Alward, David J. Kinning, David C. Martin, Dale L. Handlin Jr., and Lewis J. FettersCite this: Macromolecules 1986, 19, 8, 2197–2202Publi…
We have measured the frequency-dependent specific heat of glycerol and propylene glycol near the glass transition. The measurements, covering a frequency range of five decades, probe the linear response of these supercooled liquids to small perturbations from equilibrium. The specific heat of these two liquids contain…