Fractal model for polarization switching kinetics in ferroelectric crystals
The kinetics of polarization switching in ferroelectric crystals is studied using the concept of fractals. The switching process is found to be multifractal.
Materials Literature
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Thermoplastic elastomers based on ionomeric polyblends of zinc salts of maleated polypropylene and maleated EPDM rubber
Abstract Ionomeric polyblends of the zinc salt of maleated EPDM rubber (Zn‐mEPDM) and the zinc salt of maleated polypropylene (Zn‐mPP) in the composition range from 90/10 to 60/40 wt% behave as ionic thermoplastic elastomers (ITPE), which show synergism in physical properties. The ionomeric polyblend shows higher phys…
Time-domain FEM analysis of quasi-static magnetic fields around nonperfectly conductive shields
A time-domain analysis of quasi-static magnetic fields around nonperfectly conductive shields is performed by a numerical procedure based on the nodal-based finite element method (FEM). Eliminating the shield region from the computational domain, a new boundary is generated where impedance network boundary conditions…
Peroxo‐oxalate Preparation of Doped Barium Titanate
The peroxo‐oxalate complexation method is a method that can be used for the preparation of doped barium titanate. In this paper we focus on BaTi 0.91 Zr 0.09 O 3 , which can be used for discharge capacitors in lamp starters. The preparation method described here is based on the complexation and subsequent precipitatio…
Two-Dimensional Honeycomb Network Formed by Porphyrinatomanganese(III) and μ4-σ-Dimerized 7,7,8,8-Tetracyano-p-quinodimethane Dianion
Abstract An unprecedented layered (2-D) honeycomb supramolecular structure comprised of μ4-σ-dimerized 7,7,8,8-tetracyano-p-quinodimethane dianion bridging four S = 2 substituted Mn(III)porphyrins as demonstrated with meso-tetrakis(2,4,6-trimethylphenyl)porphyrinato has been structural characterized.
Dielectric and high-pressure investigations on a thermotropic cubic mesophase
Optically isotropic cubic mesophases, which are commonly exhibited by lyotropic materials, have been observed in a few thermotropic liquid crystalline systems also. Although the first thermotropic cubic mesophase was reported about 40 years ago, its existence in diverse systems is only a recent finding. Moreover, the…
Distortional Isomers of a Mixed-Valence Binuclear Cu Complex
The resonance Raman spectra of a mixed-valence copper dimer [Cu2(L)]3+ encapsulated by the ligand L = N(CH2CH2N(H)CH2CH2N(H)CH2CH2)3N are reported. Copper isotope data (63/65Cu) of solution spectra of [Cu2(L)]3+ allow identification of vibrational bands at 289 and 172 cm-1 as predominately Cu−Cu stretching and Cu−Cu−N…
A web-based library of XAFS data on model compounds
With the predominance of XAFS analysis for structural information now using theoretical standards such as FEF~ The motivation for this work is threefold. First, the library is intended to reduce the need to collect XAFS data on model compounds, which is still useful in assessing the reliability of theoretical XAFS sta…
Fabrication of high-spatial-frequency gratings through computer-generated near-field holography
We demonstrate an innovative method for fabrication of high-spatial-frequency grating structures. This technique makes use of the near-field diffraction patterns from computer-generated phase holograms for lithographic fabrication of grating structures with periods that are one half that of the phase hologram mask. Li…
Blends of isotactic polypropylene and natural terpene resins. I. Phase structure, thermal, and dynamic-mechanical properties
This article discusses the influence of two natural terpene resins (NTR), poly(α-pinene) (PαP A115) and poly(d-limonene) (PL C115), on morphology, miscibility, thermal, and dynamic-mechanical properties of their blends with isotactic polypropylene (iPP). The NTR have interesting physical and chemical properties, and t…
Crystal structure and crystal-chemical features of a new Ti-rich member of the eudialyte family
Abstract The trigonal structure of a new member of the eudialyte group was established from X-ray single-crystal diffraction, λ (Mo K α ) = 0.71073 Å; space group R 3 m ; a = 14.153(9) Å, c = 60.72(5) Å, V = 10546.1 Å 3 ; M = 3050; D x = 2.88 g/cm 3 ; Z = 3; μ = 28cm −1 ; R ( hkl ) = 0.068 for 3402 reflections. Due to…
The prediction of hydrogen bonded polymer blend phase behavior using equilibrium constants determined from low molar mass analogues
Equilibrium constants determined from low molecular weight mixtures are used to predict the phase behavior of analogous polymer blends. Due consideration is given to intramolecular screening and functional group accessibility, factors that are a direct consequence of chain connectivity.
Effect of the magnetization direction in permanent magnet on motor characteristics
Two kinds of magnetization in isotropic permanent magnets are introduced and analyzed by FEM: one is a radial magnetization type, the other is a parabolic one. From the results of FEA, it is found that the permanent magnet with parabolic magnetization has low leakage flux and high interior surface flux density despite…
Characterization of the Ti-doped diamond-like carbon coatings on a type 304 stainless steel
The microstructure and chemistry of a functionally gradient Ti-doped diamond-like carbon (DLC) coating prepared by a closed field unbalanced magnetron sputtering system (CFUBMS) on a type 304 stainless steel was analyzed by transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS), and scanning…
Viewing angle of liquid-crystal displays: representation on the Poincaré sphere
Using the extended Jones calculus for oblique incidence, we have succeeded in representing light propagation through birefringent media on the Poincaré sphere for arbitrary propagation directions. The situation is far more complicated than for the case of perpendicular transmission. To achieve a simple representation…
Direct formation of nano-sized PbTiO3powders by high energy ball milling
Nano-sized PbTiO3 powders have been successfully synthesized using the high energy ball milling technique. The materials used are PbO and TiO2 Anatase and Rutile powders. The powders milled for different hours are characterized using XRD and TEM. Experimental results show that the single perovskite phase of PbTiO3 can…
The Role of Surface Area in the NO−Carbon Reaction
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationThe Role of Surface Area in the NO−Carbon ReactionJ. M. Calo, E. M. Suuberg, I. Aarna, A. Linares-Solano, C. Salinas-Martínez de Lecea, and M. J. Illán-GomézView Author Information Division of Engineering, Brown University, Providence, Rhode Island 02912 Deparamento de Quí…
Optical and acoustical investigation for plastic deformation of isotactic polypropylene/ethylene‐1‐hexene copolymer blends
Abstract The effects of morphology on mechanism of plastic deformation are investigated for binary blends of isotactic polypropylene and rubbery ethylene‐1‐hexene copolymers. In this work, plastic deformation developed during elongation is investigated by measuring light transmittance, electron microscopy, and ultraso…
The occurrence of two types of collagen proα‐chain in the abalone Haliotis discus muscle
Acid-soluble collagens were prepared from connective tissues in the abalone Haliotis discus foot and adductor muscles with limited proteolysis using pepsin. Collagen preparation solubilized with 1% pepsin contained two types of alpha-chains which were different in their N-terminal amino acid sequences. Accordingly, tw…
RA regulation of keratin expression and myogenesis suggests different ways of regenerating muscle in adult amphibian limbs
Formation of a regeneration blastema following limb amputation is believed to occur through a process of dedifferentiation. It has been suggested, however, that the cells contributed to the blastema by the stump muscle are satellite-like cells, rather than cells originated by dedifferentiation. We have previously show…