Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Water proton transverse relaxation times (T2) and self-diffusion coefficients (D) were measured in randomly oriented hydrated collagen fibers. Three T2 relaxation times were discerned indicating the presence of at least three water fractions in the collagen sample. The D values associated with each water fraction were…
We have prepared Ba–Co2Z and Sr–Zn2Y ferrites by mixing SrCO3 (BaCO3), Co2O3 (ZnO), and Fe2O3 and calcinating in air and O2. The effects of sintering atmosphere (O2 and Ar) and sintering temperatures (1373–1573 K) on the structural, magnetic, and electrical properties have been measured. The Ba–Co2Z sample sintered at…
A first-principles molecular-dynamics study of glassy ${\mathrm{As}}_{2}{\mathrm{Se}}_{3},$ using a 215-atom model, is presented. Our model is in good and uniform agreement with available measurements of the structural, vibrational, and electronic properties. The model reproduces the structure of the experimental stat…
Computer simulations are performed in this article to show the feasibility of simultaneous determination of the film diffusivity, the substrate diffusivity, and the thermal boundary resistance of film-on-substrate systems by modulated thermoreflectance microscopy and multiparameter fitting. The dependences of the phas…
An icosahedral phase (i-phase) has been synthesized by mechanical alloying of an elemental blend of Al70Cu20Fe10. Mechanical alloying of Al and Fe in the stoichiometric ratio of 3:1 and continued milling after the addition of Al and Cu to yield the nominal composition of Al70Cu20Fe10 does not result in the i-phase for…
Plasma-assisted molecular beam epitaxy of ZnO epilayers and MgZnO/ZnO heterostructures on Al2O3(0001) substrates is described. A thin MgO layer is employed as a buffer for ZnO. The influence of the buffer on the initial growth of ZnO is discussed with the corresponding reflection high-energy electron diffraction (RHEE…
The through focus exit wave reconstruction technique uses a series of high resolution electron microscopy images to reconstruct the complex electron wavefunction at the exit plane of the specimen. The feasibility of the through focus exit wave reconstruction method and its most important limitations are discussed. It…
The magnetic anisotropy of epitaxial Cu(50 Å)/Ni(tNi/Cu(2000 Å)/Si(001) films as a function of the nickel film thickness (30 Å⩽tNi⩽150 Å) has been studied using a torque magnetometer. It is found that the magnetization rotates continuously from out-of-plane to in-plane as the nickel film thickness increases. For the 1…
In vivo (13)C nuclear magnetic resonance spectroscopy was used to elucidate the pathways and the regulation of pyruvate metabolism and pyruvate-lactate cometabolism noninvasively in living-cell suspensions of Propionibacterium freudenreichii subsp. shermanii. The most important result of this work concerns the modific…
The infrared reflectance spectra of two ${\mathrm{LaMnO}}_{3}$ crystals (pure and doped) have been measured at various temperatures between 300 and 10 K. The infrared active phonons of the two samples have been studied in detail and have been compared to recent lattice dynamics calculations. In the case of the undoped…
The temperature and field dependence of the magnetization have been measured to investigate the magnetic properties of the first oxalate–bpy mixed-ligand framework with a general formula M(ox)(bpy) (M = Fe(II), Co(II), Ni(II); ox = C2O42−; bpy = 4,4′-bipyridine). All compounds in the M(ox)(bpy) system crystallize in a…
Using the laser pyrolysis method, single phase gamma'-Fe4N nanoparticles were prepared by a two step method involving preparation of nanoscale iron oxide and a subsequent gas-solid nitridation reaction. Single phase Fe3C and Fe7C3 could be prepared by laser pyrolysis from Fe(CO)5 and 3C2H4 directly. Characterization t…
The properties of thick BaScxFe12−xO19 (0.3<x<0.6) scandium hexaferrite films were measured by static and microwave field techniques. Films were deposited by pulsed laser ablation onto c-plane sapphire at oxygen pressures of 20 and 50 mTorr. Vibrating sample magnetometer measurements as corroborated by x…
For a uniformly magnetized rectangular particle with dimensions in the ratio 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction are determined to be Hc/Ms=0.057069478 and Hs/Ms=0.057142805. Previous micromagnetic computations of coercive and switching fields that did not approach these values for…
Titanium oxide films with a thickness of a 400 nm were deposited on p-type Si(100) at 250 °C by electron-beam evaporation where titanium dioxide was evaporated in oxygen environment at a pressure of 2×10−6–4×10−5 Torr. Effects of oxygen flow rate (FO2) between 0 and 40 sccm on properties such as crystallinity, surface…
The deep-sea vent archaeon Pyrococcus abyssi strain ST549 was grown in batch cultures in closed bottles and by continuous culture in a gas-lift bioreactor, both in the presence and in the absence of elemental sulfur. Growth on carbohydrates, proteinaceous substrates and amino acids was investigated. The disaccharides…
A collagen-like peptide with the sequence (GER)(15) GPCCG was synthesized to study the formation of a triple helix in the absence of proline residues. This peptide can form a triple helix at acidic and basic pH, but is insoluble around neutral pH. The formation of a triple helix can be used to covalently oxidize the c…
The production of molecular hydrogen in the radiolysis of high-density polyethylene, isotactic polypropylene (PP), poly(methyl-methacrylate) (PMMA), and polystyrene (PS) by γ rays and 5–20-MeV helium ions was investigated. Molecular hydrogen is the dominant gaseous product from these polymers, and the yields with γ ra…
High-pressure synchrotron x-ray powder-diffraction studies show that trigonal $\ensuremath{\alpha}\ensuremath{-}{\mathrm{ZrMo}}_{2}{\mathrm{O}}_{8}$ transforms to a monoclinic symmetry phase $(\ensuremath{\delta}\ensuremath{-}{\mathrm{ZrMo}}_{2}{\mathrm{O}}_{8})$ at 1.06--1.11 GPa. The space group was determined to $C…
In this study, we observed the flow-induced silica structure, which was formed during in situ gelation in the presence of wormlike micelles of cetyltrimethylammonium bromide and structure-forming additive, sodium salicylate. A silicon alkoxide of tetramethyl orthosilicate was used for the in situ gelation as a precurs…