Materials Literature
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Scanning tunneling spectroscopy (STS) has been used to investigate the electronic structure of tetrahedral amorphous carbon (ta-C) films. The density of states (DOS) was derived from the normalized conductivity spectra at fixed tip heights. Band edges were defined by extrapolating the generalized conductivity (dI/dV)…
The crystal structure of a triple helical peptide (Pro-Hyp-Gly)10 has been determined at 1.9 A resolution. Single crystals grown by the hanging drop method, diffracted to a resolution of 1.8 A. The polymer-like structure of the triple helical repeat Pro-Hyp-Gly was in accordance with the 7/2 model proposed for collage…
Functionalized metallodendrimers are a rational synthetic target for gas sensing since a range of transition metal centers can potentially be used and the ligand fragments may serve as anchoring points to an appropriate support. The authors summarize the synthetic approach to compounds such as that shown in the Figure…
Shake-and-Bake is a direct-methods procedure which has provided ab initio solutions for protein structures containing as many as 1000 independent non-H atoms. This algorithm extends the range of conventional direct methods by repetitively, unconditionally and automatically alternating reciprocal-space phase refinement…
Common Berthing Mechanism (CBM provides the structural interface between separate International Space Station (ISS) elements, such as the Laboratory and Node modules. The CBM consists of an active and a passive half that join together with structural bolts. The seal at this interface is the CBM-to-CBM molded seal. The…
A new marine diatom, Thalassiosira andamanica, is described from light and electron microscopy. The specimens were collected in the vicinity of Phuket Marine Biological Center, Thailand, and later brought into clonal culture. Thalassiosira andamanica possess a rimoportula with a pronounced outer extension, one margina…
A detailed investigation of the microscopic mechanisms of tensile stress deformation was performed. The experiments involved two different thermoplastic materials: high impact polystyrene (HIPS) and a novel polystyrene (PS)−polybutadiene (PB) blend, at temperatures ranging from 30 to 70 °C, deformed at a constant unia…
We have performed ab initio pseudopotential calculations to study the effects of structural deformations of iron porphyrin on the configuration of a carbon monoxide (CO) attached to it. We have considered two proximal deformations around the heme group: (i) rotation of a pyrrole ring in the iron porphyrin, and (ii) ro…
It is thought that hydrogen bonding is responsible for the ferroelectricity in ammonium tetrafluoroberyllate, (NH(4))(2)BeF(4). In the past X-ray data have been collected, but these did not permit accurate determination of the H-atom positions. In order to obtain more accurate information the neutron structures have n…
In this paper, the high strain powder metallurgy (HS-PM) process was applied to an SUS 316L stainless steel powder, and the microstructural changes during the process are discussed. The HS-PM process is applied to an SUS 316L austenitic stainless steel. In the case of the SUS 316L stainless steel, room temperature rec…
A single crystal of a birefringent Cr-bearing majorite, Mg 3 Mg 0.34 Si 0.34 Al 0.18 Cr 0.14 ) 2 Si 3 O 12, was synthesized at 20 OPa and 2000 °C using “6-8” type uniaxial split-sphere apparatus. This garnet is tetragonal with the unit-cell parameters a ≈ c and deviates slightly from cubic symmetry. The structure refi…
This review comprises an up‐to‐date literature survey on the topic of food contact can coatings. Special consideration is given to the choice of can coating. To avoid reactions between the food and the metal of the can, the interior metal surface is treated with lacquers which act as a barrier. This ensures that the r…
Superplasticity can be generally achieved by grain boundary sliding (GBS). The GBS in polycrystalline materials sometimes accompanies with intergranular fracture because of stress concentrations at triple points and/or GB irregularities. To develop the superplastic flow, it is necessary to suppress the intergranular c…
A series of copolyesters were prepared by the incorporation of p-hydroxybenzoic acid (HBA), hydroquinone (HQ), and terephthalic acid (TA) into poly(ethylene terephthalate) (PET). On the basis of viscosity measurements, high molar mass copolyesters were obtained in the syntheses, and 1H-NMR analyses indicated the total…
Abstract Polyesteramides were prepared by reactive extrusion by a condensation reaction of a fatty dicarboxylic acid [Unichema Pripop (1009) (C36)] or a carboxyl terminated polyamide 12 (CTPA 12) and a dioxazoline coupling agent [(1,3‐Phenylene)‐bis(2‐Oxazoline), (OO)]. The Residence Time Distribution (RTD) was measur…
Platelike particles of SrFe12O19 with epitaxially grown Fe3O4 overlayer were prepared by a wet method. The experimental results have shown that modified sample has an exchange coupling between epitaxial layer and Sr-ferrite core. As Fe2+ quantity added, coercive force decreased and saturation magnetization increased,…
Abstract An experimental study was conducted in a 0.43‐m‐ID packed column to determine the axial mixing properties of air and water under single‐phase flow conditions. The packings used were 25.4‐mm ceramic Raschig rings, one modern random packing, 25.4‐mm metal Pall rings; two structured packings, Sulzer BX and Flexi…
Abstract Phase separation of poly(2‐chlorostyrene)/poly(vinyl methyl ether) (P2CS/PVME) blends driven by a temperature gradient was investigated by phase‐contrast optical microscopy combined with digital image analysis. The samples were set in a temperature gradient in such a way that the two ends of the gradient cove…
The nature of minerals in the B horizons of alpine forest soils in subtropical and tropical areas remains to be identified. The objective of this study was to investigate the distribution of Fe-oxides and hydroxy-interlayered vermiculite (HIV) in typical alpine forest soils of Taiwan. Five pedons at roughly 2000 m ele…
The synthesis of tetraphenylporphyrin, H2[TPP], and para-substituted tetraphenylporphyrins, H2[(p-X)4TPP], where X = CN, CH3, and OCH3, is easily accomplished using microscale glassware. The compounds are synthesized from inexpensive starting reagents.