Materials Literature
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A method of visualizing the 180°-domain structure in TGS type crystals by means of nematic liquid crystals (NLC) is described. The possibility of visualization is due to the different orientation of NLC molecules on the domains with opposite orientation. The method enables the observation of static domain structure on…
The spectroscopic constants of hydroxyl ions formed from hydrogen, deuterium, and tritium in a potassium tantalate (KTaO3) host have been determined. These isotopes were found to diffuse readily either into or out of KTaO3 single crystals. At T=77 K the infrared absorption band due to the OH−, OD−, or OT− stretching v…
Abstract Poly(ester amides) with physical properties similar to those of liquid crystalline polyesters were prepared by acidolysis of poly(ethylene terephthalate) with p ‐acetamidobenzoic acid and then polycondensation through the acetamido and carboxyl groups. The ester amide polymers had a random sequence distributi…
Abstract The oxidations of ferrocene (FcH) and n ‐butylferrocene (FcBu) by ferric salts (nitrate or bromide) are strongly inhibited by aqueous cetyltrimethylammonium bromide and nitrate (CTABr and CTANO 3 , respectively). The kinetics of inhibition fit a model in which the substrates are distributed between water, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible conformational changes induced by light in poly(L-glutamic acid) with photochromic side chainsOsvaldo Pieroni, Julien L. Houben, Adriano Fissi, Paolo Costantino, and Francesco CiardelliCite this: J. Am. Chem. Soc. 1980, 102, 18, 5913–5915Publication Date (Print):A…
Highly nonequilibrium thermodynamic processes occur during the ultrarapid recrystallization characteristic of pulsed laser annealing. Values of interface segregation coefficients are observed to differ from equilibrium values by as much as three orders of magnitude and equilibrium solubility limits may be exceeded by…
All current intravascular radiological contrast media are salts and produce solutions of very high osmolality--five to eight times that or tissue cells, plasma or tissue fluid (all of which have an osmolality of 300 mosmols per kg water). Erythrocytes and vascular endothelium are adversely affected by the high osmolal…
The width of symmetrical, threefold stacking‐fault nodes in a Cu‐13–43 at. % Al alloy has been measured as a function of node character by means of weak‐beam electron microscopy. The stacking‐fault energy (γ) has been determined independently of the measurement of the width of single, straight, dissociated dislocation…
Summary Total, dithionite-extractable (‘free’) and oxalate-extractable (amorphous) Fe as Fe 2 O 3 forms were determined in eight Nigerian soil profiles selected to include four major parent materials and different drainage conditions. Total Fe ranged from 1·98 to 15·01 % Fe 2 O 3 , the average contents being 4·40, 8·6…
Abstract Light scattering and viscometric studies have been carried out on dilute solutions of a polybenzimidazole in N , N ‐dimethylacetamide. The data, which span the molecular weight range 2.9 ≦ 10 −4 M w ≦ 23.3, and the temperature range 290 ≦ T / K ≦343, yield the dependence of the mean‐square radius of gyration…
Empirical fits to data are obtained which determine the backscattered electron coefficient for films of arbitrary thickness and electrons of normal incidence over the energy range 20–53 keV for the elements Al, Cu, Ag, Au, and Bi. From this is derived a ’’universal’’ fit which describes with reasonable accuracy the ba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron delocalization in 2,4,6-tris(1,3-dithiol-2-ylidene)-1,3,5-cyclohexanetrione and 2,4,6-tris(1,3-dithiolan-2-ylidene)-1,3,5-cyclohexanetrioneMichio Kimura, William H. Watson, and Juzo NakayamaCite this: J. Org. Chem. 1980, 45, 18, 3719–3721Publication Date (Print):Aug…
The Experimental Breeder Reactor II Mark-II metallic-driver-fuel element has been irradiated to high burnup to assess element lifetime and performance reliability. The elements breached at 10 at.% burnup or greater. This increase in burnup potential compared to its predecessor, the Mark-IA (limited to a burnup of 3 at…
Using a tape casting process, lamellar heterogeneous devices comprised of layers of a commercial soft ferroelectric (modified PZT) and an antiferroelectric (modified PZSnT) were produced. Such devices were found to behave in a similar way to that of a transpolarizer and to effectively stabilize the polarization in the…
Zero magnetostriction compositions in the (FeaCo1−a−bNib)100−y(Si0.4B0. 6)y system in the range 20⩽y⩽30 and 0⩽b⩽0.6, the resultant magnetic properties, and the crystallization temperatures were systematically studied as functions of Ni content (b) and metalloid content ( y). The iron content (a=0.058−0.11) decreases w…
(1980). Origin of accessory moissanite. International Geology Review: Vol. 22, No. 8, pp. 961-970.
Low temperature specific heat of the itinerant electron antiferromagnetic Cr 1- x V x alloys was measured in the temperature range between 1.4 and 5.0 K. The V concentration dependence of the linear specific heat coefficient is interpreted in terms of two contributions, the effect of spin fluctuations and the variatio…
Abstract The compounds SrZn 2 As 2 , SrCd 2 As 2 , and YbMnCuP 2 have been prepared and their structures determined. They are isotypic and crystallize trigonally in a CaAl 2 Si 2 -type structure (space group P3̄m 1) with the lattice constants: SrZn 2 As 2 a = 422,3(1) pm, c = 726,8(1) pm, SrCd 2 As 2 a = 445,2(1) pm,…
ABSTRACT Young’s moduli (E) in bending and extension were measured for selected contour feather shafts from the chicken (Gallus domesticus), turkey (Meleagris gallopavo), ring-necked pheasant (Phasianus colchicus) and herring gull (Larusargentalas). These were treated mechanically as tapering beams. In extension, E ra…
Laser-induced-fluorescence-band-narrowing and time-resolved-spectroscopy techniques are extended to measure the inequivalent sites in the spectroscopic properties of $^{3}P_{1}$ and $^{3}P_{0}$ excited states of the ${\mathrm{Bi}}^{3+}$ ion in germanate glass. Under excitation of the $^{3}P_{1}$ components, at 4 K, th…