Materials Literature
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Desorption of NO molecules from Pd(110) at 490 K mediates the emission of N 2 and N 2 O. The N 2 emitted at 490 K has a spatial distribution with a maximum intensity at 38° from the surface normal in the [001] direction, which is expressed by 0.9 cos 4.2 θ + 1.9 cos 46 (θ ± 38°). In contrast, the desorptions of NO and…
Atomic structures and energies of symmetrical 〈001〉 tilt grain boundaries (GB's) in diamond have been calculated over a wide range of misorientation angle using a many-body analytic potential, and for some selected short-period grain boundaries with tight-binding and first-principles density-functional methods. The gr…
Poly(ester-amide)s with L-alanine contents of 100 (LalaS-100), 90, 80, 70, 50, 30 and 0 were prepared by interfacial polycondensation of the mixture of 1,6-hexanediol diester of L- and D-alanine with sebacoyl chloride. The enzymatic degradation of the poly(ester-amide)s was followed by the weight loss in a buffer solu…
Recently the rotational isomeric state model for unperturbed polymers has been combined with potential energy functions designed for the description of the interactions of pairs of molecules in the gaseous state for the purpose of reversibly bridging between simulations of coarse-grained (on-lattice) and fully atomist…
The preparation and the structural and magnetic characterization of a series of sheetlike transition metal polymers of formula [ML2X2] [M ˭ Mn(II), Fe(II), Co(II) and Ni(II): L = pyrazine (pyz) and pyrimidine (pym); X = pseudohalide anion] are presented herein. The nature of the intralayer magnetic interaction is disc…
15N relaxation measurements have been performed on the type Iota blue copper protein azurin from Pseudomonas aeruginosa. The relaxation times show that one loop (residues 103-108) and one turn (residues 74-77) display fast internal motions. The rest of the protein is rigid with an average order parameter S(2) of 0.85…
To reduce the amount of compliance testing for food contact polymers the use of migration modelling has been proposed. This study was conducted to provide valid data for the independent evaluation of two such diffusion-based models using a range of different high density polyethylene (HDPE) polymers and plastics addit…
Nucleation and growth of Cu by chemical vapor deposition (CVD) using hexafluoracetylacetonato‐Cu(I)‐trimethylvinylsilane [hfac(Cu)tmvs] on different physical vapor deposition (PVD) diffusion barriers, namely, tantalum (Ta) and tantalum nitride with x < 0.5), were studied by means of scanning and transmission electron…
Using a first-order perturbation theory, we have studied the phase diagram of a binary mixture of hard spheres for different values of the size ratio. Recent models for the two-body depletion potential between large spheres are used to take into account the role of the small spheres. The theory predicts a complex phas…
The genes encoding NAD(+)-dependent alanine dehydrogenases (AlaDHs) (EC 1.4.1.1) from the Antarctic bacterial organisms Shewanella sp. strain Ac10 (SheAlaDH) and Carnobacterium sp. strain St2 (CarAlaDH) were cloned and expressed in Escherichia coli. Of all of the AlaDHs that have been sequenced, SheAlaDH exhibited the…
One avenue being pursued in the development of dislocation-based models of plasticity is the explicit simulation of the dynamics of dislocations, based on the recognition that such dislocations are the carriers of plasticity. The construction of models of dislocation dynamics requires insights into both the nucleation…
The influence of block copolymers (BCP) and interfacial reaction on the deformation of 30−100 μm polymer drops inside an immiscible polymer matrix was visualized in a parallel plate, counterrotating apparatus. Symmetric diblock copolymers were blended into polypropylene (PP), poly(methyl methacrylate) (PMMA), and poly…
Bicrystals of ZnO without intergranular additives were synthesized to elucidate the effect of Co and Mn doping on the varistor properties of ZnO ceramics. Nonlinear current-voltage ( I – V ) characteristics due to the formation of an interfacial barrier were observed in bicrystals doped with Co or Mn, while the nondop…
We have used inelastic-neutron-scattering measurements to investigate the magnetic excitations in a layered manganite ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ which shows colossal magnetoresistance behavior. We have measured the dispersion of both the acoustic and the optic modes along…
For many centuries, materials were discovered, mined, and processed in a largely serendipitous way. However, the characterization of the atom and the progress made in x-ray diffraction during the early years of this century started a quest for a theory of materials in terms of their atomic constituents. Later decades…
Raman scattering studies of lead zirconate titanate Pb(Zr x Ti 1- x )O 3 (PZT), 0.10≤ x ≤0.80, and Nd-modified lead titanate Pb 1-3 y /2 Nd y TiO 3 (PNT), y =0.02, 0.10, bulk ceramics were carried out at ambient temperatures between 4.2 and 297 K. Our measurements reveal splitting of the E ⊕ B 1 symmetry peak at low t…
Aluminum extractability and solubility were investigated in detail in six horizons of a Typic Haplohumod (FAO: Haplic Podzol) from southern Switzerland. Pyrophosphate and oxalate extractions as well as successive acid leaching indicated that in the Ah, (AE), and Bh horizons reactive Al is mainly bound to soil organic…
Abstract Electrical conductivity and positive temperature coefficient (PTC) behavior of carbon black (CB) filled incompatible polyblends of ethylene‐vinyl acetate copolymer/low density polyethylene (EVA/LDPE) were investigated. In comparison with single polymer systems, more possibilities for tailoring composite perfo…
To design Co‐free, low‐pressure, hydride‐forming compounds for application in rechargeable nickel metal hydride batteries, nonstoichiometric AB x materials were investigated. The influence of both the Mn content and the degree of nonstoichiometry on the crystallography, electrochemical cycling stability, and electrode…
Three skeletal tissues of the adult echinoid Paracentrotus lividus (the pedicellaria primordium, the test, and the tooth) were immunolabeled with three sera raised against the total mineralization organic matrix and two specific matrix proteins (SM30 and SM50) from the embryo of the echinoid Strongylocentrotus purpura…