Materials Literature
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A model for chemical vapor infiltration is applied to the study of the growth of alumina from the chemical reaction among AlCl 3 , H 2 , and CO 2 within a SiC‐fiber bundle which is situated in an isothermal hot‐wall reactor. The pore space between the fibers is simulated by cylindrical capillary tubes. The model consi…
We study cellular structures moving at constant velocity, in a symmetric model of directional solidification. This is done by employing Newton's method to solve a discretized version of the integro-differential equation for the solid-liquid boundary. Our results indicate that there is a continuous band of allowed wave…
We report on the temperature evolution of the 2${k}_{F}$ charge-density wave (CDW) in the blue bronze ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$. Using detailed profile analysis of the x-ray scattering, we were able to deduce: (i) from the temperature dependence of the peak intensity the square of the order parameter in…
Specific DNA staining for electron microscopic observation is simplified by a shorter synthesis of the staining reagent. The new, more reliable reagent, osmium ammine-B, is stable for more than a year, dissolves completely in water, and does not require reoptimization of staining conditions for every batch, yet reprod…
An explicit formula for the chemical potential (μ) of simple fluids is derived for a whole class of integral equation theories, including the Percus–Yevick approximation and some other, more recently proposed closures. This formula only requires the pair correlation functions for one single state of the system, and ap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor to metal transition of WS2 induced by K intercalation in ultrahigh vacuumF. S. Ohuchi, W. Jaegermann, C. Pettenkofer, and Bruce A. ParkinsonCite this: Langmuir 1989, 5, 2, 439–442Publication Date (Print):March 1, 1989Publication History Published online1 May 20…
The synthesis is described of some liquid crystal polymers containing various degrees of cross linking units. Such materials show properties over and above those observed either from low molecular weight liquid crystals, or from conventional rubbers. Thus, though these compounds show simple rubber like elasticity in t…
The electrodeposition of binary aluminum‐manganese alloys from chloroaluminate molten salts is reported. The manganese content of the electrodeposit varies from 7 to 30 w/o and is dependent upon deposition potential and the relative concentrations of and Mn ++ in the melt. At small cathodic overpotentials the depositi…
Static and dynamic light scattering are used to study the aggregation kinetics and structure of colloidal gold. Fast aggregation is achieved by either addition of pyridine, lowering of the pH, or addition of salt. The kinetics of rapid growth is followed by measurement of the polarized relaxation time ${\ensuremath{\t…
Small-angle neutron-scattering structure factor measurements were made on sterically stabilized silica spheres dispersed in benzene up to volume fractions of 0.30. Benzene is only a marginal solvent for the stabilizing layer on the surface of the particles. The particles are made attractive by lowering temperature. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCyclodextrin-sandwiched porphyrinYasuhisa Kuroda, Takashi Hiroshige, Takashi Sera, Yasushi Shiroiwa, Hiroyuki Tanaka, and Hisanobu OgoshiCite this: J. Am. Chem. Soc. 1989, 111, 5, 1912–1913Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Pu…
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Abstract Vaughanite, idealized formula T1HgSb 4 S 7 , is a very rare primary constituent of the Golden Giant orebody of the Hemlo gold deposit, Hemlo, Ontario, Canada. It was found in two polished sections from one drill core; as a 450 by 300 µm aggregate associated with pääkkönenite, stibnite, realgar, and native ars…
Abstract A new concept, “Radiation-Induced Drug (RID)”, was proposed as a novel type of drugs for cancer therapy. To test the usefulness of this concept, 5-fluorouracil (5-FU) derivatives having various types of substituents at the 1-position were prepared and the γ-radiolyses of their aqueous solutions were studied.…
Results of experiments on the concept of flow tailoring, the use of salient features of MHD flows in strong magnetic fields to create desirable velocity profiles in the coolant ducts of the first wall and the blanket, are reported. Proof-of-principle testing of flow tailoring has been chosen as the first joint activit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR-derived electronic characteristics of zerovalent manganese carbonyl di(tertiary phosphine) radicalsGail B. Rattinger, R. Linn Belford, Howard Walker, and T. L. BrownCite this: Inorg. Chem. 1989, 28, 6, 1059–1066Publication Date (Print):March 1, 1989Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechano ions produced by mechanical fracture of solid polymer. 5. Cationic polymerization of isobutyl vinyl ether initiated by the mechano cation of poly(vinylidene fluoride)Masato Sakaguchi, Hiromu Kinpara, Yasuro Hori, Shigetaka Shimada, and Hisatsugu KashiwabaraCite this:…
Edge burrs are known to cause increases in losses of large power transformers but it is difficult to quantify their effect. A single phase experimental transformer core was prepared with arrays of thermistors to measure the localised loss when artificial burrs were introduced in a controlled manner. When laminations w…
Dynamics of the photoinduced refractive-index change in glassy As2S3 excited by pulsed light have been studied using a novel transient-grating technique, in which the grating is produced by projecting comb-filter images. Monotonic relaxations in the μs region are observed at room temperature and at 80 K. The results a…