Materials Literature
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Diatom aggregates composed of one to many chains of Pseudonitzschia pseudodelicatis-sima were abundant (up to 10% of the autotrophic biomass) in high-nutrient open-ocean regions of both the equatorial Pacific and north Atlantic. The chains were connected at a central mass composed of fecal material. The morphology is…
An empirical potential-energy function comprising two- and three-body terms, whose parameters have been determined from the properties of diamond and graphite, is used to study the structures and energies of carbon microclusters.The binding energy per atom of smaller linear clusters increases monotonically with the nu…
Magnetotransport has been studied on the quasi-two-dimensional monophosphate tungsten bronzes (PO 2 ) 4 (WO 3 ) 2 m for m = 4, 6 and 7. These series provide a model system where the low-dimensional character and the electron density can be changed with m . In P 4 W 8 O 32 ( m = 4) and P 4 W 12 O 44 ( m = 6), both Hall…
The first structurally characterized linear hexapyrrin is prepared with the solid state structure of the dihydrochloric acid salt showing it to lie in a nearly planar S-shaped conformation.
Heterojunction Ge<sub><i>x</i></sub>Si<sub>1-<i>x</i></sub>/Si internal-photoemission infrared detectors are being developed for multispectral imaging in the middle-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) spectral bands. The detectors, which are fabricated by molecular beam epitaxy of degenerate…
Article Crystal structure of bismuth nonathallium hexatelluride, BiTl9Te6 was published on January 1, 1994 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 209, issue 1).
The crystal structure of magnetoelectric KNiPO4 was refined by single crystal X-ray diffraction methods at room temperature confirming orthorhombic space group Pna21. Powder neutron diffraction investigations showed that the room temperature structure is preserved down to 30 K. Consistent with magnetic susceptibility…
Effects of hydrogen on the deformation behavior and the structure of deformation bands under monotonic loading of Inconel 718 were investigated. Hydrogen significantly reduced tensile elongation of the material and susceptibility to hydrogen embrittlement was not influenced by the aging condition. In the hydrogen-free…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Michael J. Nagy, Richard J. Buist; Effect of heat sink design on thermoelectric cooling performan…
Pressureless sintering of the SiC-AlN system with Y2O3 as a sintering aid was carried out. Composites with<50vol% SiC were densified to above 98% of the theoretical density in N2 atmosphere of 0.1MPa at temperatures below 1900°C using commercial SiC and AlN powders. The densification behavior was investigated and anal…
Results of inspection creep damage by magnetic hysteresis measurements on Cr-Mo steel are presented. It is shown that structure sensitive parameters such as coercivity, remanence and hysteresis loss are sensitive to the creep damage. Previous metallographic studies have shown that creep changes the microstructure of t…
The reaction of pyrrole and thiophene monomers with copper- or nickel-exchanged mordenite has been investigated using X-ray photoelectron (XPS) and photoacoustic infrared (PAIRS) spectroscopies. Because of the differing oxidising powers of the cations studied, polymerisation occurred only with copper-exchanged mordeni…
The reaction of oxamidrazone with sulfur dichloride affords 4,4′-bis(1,2,3,5-dithiadiazolium) dichloride, which can be reduced with triphenylantimony to the corresponding bis(1,2,3,5-dithiadiazolyl) diradical; the solid state structure and transport properties of the dimer [S2N2CCN2S2]2are reported.
Linstead macrocyclisation of 2,3-bis(dimethylamino)2(Z)-butenedinitrile gives [2,3,7,8,12,13,17,18-octakis(dimethylamino)porphyrazato]magnesium(II) and the title seco-porphyrazine, the structure of which is established by an X-ray crystallographic study.
Methanol extracts of four poly(etherurethane urea) (PEUU) materials were analyzed using Gel Permeation Chromatography (GPC). The additives in the materials were Santowhite powder at 1 wt% and Methacrol 2138 F at 5 wt% loading levels. One-to-two wt% of the original PEUU films was extractable with methanol. The extracta…
A new green complex of indium(III)[In(C48H24N13)] has been synthesised in crystalline form from the reaction of indium with 1,2-dicyanobenzene under a low nitrogen pressure at about 210 °C. It crystallizes in the triclinic system, space group P with Z= 2 in a unit cell of dimensions a= 11.693(2), b= 12.408(3), c= 15.9…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWork of adhesion between water and substituted aromatic hydrocarbonsH. Yildirim ErbilCite this: Langmuir 1994, 10, 1, 286–290Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs.org/doi/10.1021…
The glass transition is a kinetic phenomenon caused by the inability of the liquid structure to equilibrate on an experimental timescale at sufficiently low temperatures. This results in changes during heating or cooling in the temperature dependence of macroscopic properties such as volume, enthalpy, dielectric const…
The chemistry of the aqueous solution, surface chemistry of zirconium oxide (ZrO2), and the physical structure of the corrosion film have to be considered for an understanding of the mechanism of corrosion of zirconium alloys in aqueous solutions. Based on information available in all these areas, we are proposing a m…
Both synthetic and biological materials have been used for smoothing wrinkle lines and depressed scars. Injectable fillers provide a convenient and easy alternative to surgical methods to treat dermal defects. Optimally, injectable fillers augmenting dermal tissue should exhibit properties similar to the dermal collag…