Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis and Characterization of Linear−Dendritic Aromatic Etherimide Copolymers: Tuning Molecular Architecture To Optimize Properties and ProcessabilityLarry J. Markoski, Julie L. Thompson, and Jeffrey S. MooreView Author Informat…
The structure of a dispersion of monodispersed, plate-shaped colloidal particles has been investigated under shear. The dispersion displays a columnar phase when at rest, and if subjected to shear at low rates (0.1-1 s(-1)), this structure aligns with the axis of the columns in the flow direction. At low shear rates,…
The aim of this research is to construct an appropriate back-propagation neural network topology to automatically recognize neps and trash in a web by color image processing. After studying the ideal background color under moderate conditions of brightness and contrast to overcome the translucent problem of fibers in…
The equilibrium speciation of the quaternary system H+/MoO42−/HVO42−/HPO42− in aqueous 0.600 M Na(Cl) at 25 °C and 90 °C was studied by pH potentiometry and 31P (202.5 MHz) and 51V (131.6 MHz) NMR spectrometry. The study focused on solutions containing the oxoanion components in the ratios (Mo + V)/P = 12:1 and Mo/V ⩾…
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 Alejandro D. Rey; Theory of linear viscoelasticity of cholesteric liquid crystals. J. Rheol. 1 Ju…
RATIONALE AND OBJECTIVES: The objective of the two pivotal phase 3 studies was to evaluate the safety and efficacy of OptiMARK (Gd-DTPA-bis(methoxyethylamide) [Gd-DTPA-BMEA]) compared with Magnevist (Gd-DTPA) in magnetic resonance imaging of the central nervous system. METHODS: Two multicenter, randomized, double-blin…
Abstract Peroxide initiated vinylsilane grafting of polypropylene in an intensive mixer, and the subsequent water crosslinking process were studied. Different concentrations of vinyl trimethoxysilane and dicumyl peroxide were used. The materials obtained after mixing in the rheocord were hot pressed at 190°C. The melt…
The high-temperature transformation of andalusite (Al 2 O 3 ·SiO 2 = A) single crystal to 3:2-mullite (3Al 2 O 3 ·2SiO 2 = M) and non-crystalline silica (SiO 2 ) taking place between 1500 and 1600 °C was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Electron diffraction…
The dielectric properties of (Ba 0.6 Sr 0.4 )TiO 3 and Al 2 O 3 ‐doped (Ba 0.6 Sr 0.4 )TiO 3 have been characterized. The grain size of the specimen is maximum for (Ba 0.6 Sr 0.4 )TiO 3 that has been doped with 1 wt% Al 2 O 3 . The density and the real part of the relative dielectric constant each decrease as the Al 2…
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…