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。
This paper deals with the computation of the magnetic field and core losses in a squirrel-cage induction motor. The computational algorithm consists of the vector Preisach model incorporated in two-dimensional time-stepping finite element analysis. The hysteretic nonlinearity is handled by the fixed-point iterative te…
In this work, the magnetization dynamics of soft magnetic materials is studied with the aid of transverse differential permeability μ(Iac,f,Hdc) spectra. Contributions to the magnetization processes from domain wall motion and rotation of the magnetization can be extracted from the transverse differential permeability…
Dislocation mechanisms responsible for mechanical properties of nanoscaled multilayers are studied using the example of heavily drawn pearlitic steel wires. Two specific types of dislocation source are observed during transmission electron microscopy in situ straining experiments: one dislocation source operates at wi…
The analysis of the scattering intensity I0 (q) (q = (4 π/λ) sin (θ/2); λ: wavelength of radiation; θ: scattering angle) of dissolved linear polymers derived from static scattering experiments is considered. The determination of I0 (q) and possible sources of experimental uncertainties are discussed in detail. Moreove…
The role of surface tilt in the operation of pi-cells (OCB) is discussed. We show the effect of tilt on the relative stability of the H and V states, the switching characteristics and the domain growth speed. We further study the effects of temperature and cell thickness on the domain growth.
New experimental results are reported on the partitioning of Os between Ni 94 Os 6 (at) alloys and silicate melt at 1400 °C at one atmosphere total pressure and oxygen fugacities ranging from 10 -6 to 10 -8 atm. Specially designed experiments allowed us to avoid nugget formation, which was responsible for the anomalou…
The gyromagnetic switching behavior of a single-domain grain or particle with uniaxial magnetocrystalline and shape anisotropy is solved analytically by the gyromagnetic torque equation using physically plausible Gilbert damping. The sole restriction is that the anisotropy easy axis and the applied field be collinear.…
We investigated the temperature $(T=15\ensuremath{\sim}290\mathrm{K})$ and the magnetic-field-dependent $(H=0\ensuremath{\sim}17\mathrm{T})$ optical conductivity spectra of a charge-orbital-ordered manganite ${\mathrm{Nd}}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3}.$ With variation of T and H, large spectral weight ch…
We describe the increase of photoluminescence intensity from densely packed semiconductor nanocrystals (quantum dots) with excitation time, which is clearly observed by the naked eye under ambient conditions. This enabled the invention of the first luminescence-based optical memory media feasible for practical applica…
Properties of the ferromagnetic III–V semiconductor (Ga,Mn)As and heterostructures based on it are reviewed. A model based on hole-mediated ferromagnetic interaction is shown to successfully describe the ferromagnetic transition temperature of (Ga,Mn)As. Spontaneous splitting of resonant tunneling spectra was compared…
Characterization of the very early calcium phosphate (CaP) crystals deposited in bone or in osteoblast cell cultures has been hampered by the overwhelming presence of organic matrix components and cells that obscure spectral analyses. We have overcome this problem using isolated protein-free crystals and have obtained…
Abstract Different para-substituted meso-tetraphenylporphyrins (H2T(4-X)PP, X = H, Cl, CH3, CH(CH3)2, OCH3) react with various molar ratios of tetracyanoethylene (TCNE) in dichloromethane or benzene and produce only the 1 : 2 molecular complex, (TCNE)2H2T(4-X)PP. The remarkable agreement between the corresponding 1H,…
Recently, <001>-oriented nanometer-sized pores (nano-pores) without side branches, unlike porous Si, have been realized by our group on (001) n -InP surfaces by means of electrochemical anodization in 1M HCl solution. However, they exhibit large structural nonuniformity including the presence of an irregular top…
The geometrical features and electronic structure of molecular clusters models of two octahedrally coordinated cations in edge-sharing octahedra were studied by means of Hartree-Fock ab initio molecular orbital calculations at LANL2DZ and 6-31+G* levels. These models represent the different cation pairs among Al 3+ ,…
Near-UV excited-state absorption spectra obtained with a pulsed pump–probe technique were recorded in LiYF4:Pr3+ at 77 and at 8 K and revealed a detailed structure of the 4f2 1D2→4f5d and 4f2 (3P0+1I6)→4f5d optical transitions. These experimental results, together with those previously obtained at room temperature, ar…
Abstract A procedure for synthesizing crystallization‐based separation processes is presented. In an evolutionary manner and without being restricted to a particular crystallization technique, flowsheet alternatives are generated to meet the separation objectives for a given system. This is achieved by recognizing the…
A large number of lead-free BaTiO3-based ceramics were prepared. Depending on the composition, some of them exhibit a relaxor behaviour whose characteristics were related to the type of ionic substitution and to the substitution rate. The relaxor effect is all the more favoured as the composition deviates more from Ba…
New well-defined macrodiols were prepared by ring-opening copolymerization of lactones and cyclic diesters with a low molecular weight diol. Suitable monomers are diglycolide, L,L-dilactide, ε-caprolactone, and rac-β-butyrolactone. With exception of rac-β-butyrolactone, the reaction can be performed with or without a…
We report on the fabrication of metal nanowires on an insulating substrate using carbon nanotubes as a new kind of mask material. By irradiating Ar+ ions of 300 eV energy on a nanotube-coated Au/Ti thin layer on a SiO2 substrate, Au/Ti nanowires were successfully formed just underneath the nanotube, indicating that th…
An electron-based technique for the imaging of crystal defect distribution such as material growth histories in non- and poorly conductive materials has been identified in the variable pressure or environmental scanning electron microscope. Variations in lattice coherence at the meso-scale can be imaged in suitable ma…