Materials Literature
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Abstract Thermogravimetry, X‐ray and electron diffraction and high resolution electron microscopy show that the reduction process from perovskite La 0.5 Ca 0.5 MnO 3 to brownmilleriteLa 0.5 Ca 0.5 MnO 2.5 is a reversible topotactic process. Two series of monophasic La 0.5 Ca 0.5 MnO 3– δ oxygen‐deficient perovskites w…
The impact behavior of multi-ply fabric was modeled considering different fabric features. The viscoelastic yarn model was adopted to represent the dynamic behavior of fibers. Yarn pullout on the fabric edges was considered as well as yarn slippage on the warp and weft crossovers. Crimp straightening, slippage on the…
We study the electronic structures of Mn X ( X =As, Sb, and Bi) in a ferromagnetic phase based on the density functional theory within the local spin density approximation using a fully relativistic full-potential linear-combination-of-atomic-orbitals method. In particular, we focus on the effects of spin–orbit coupli…
Abstract A new type of carbonylation of styrenes was achieved under a 1:1 mixture of CO (0.5 atm) and O2 (0.5 atm) in the presence of Pd(OAc)2 combined with H5PMo10V2O40·nH2O to give 4-methyl-2-phenylnaphthalen-1(4H)-one in 78% yield. Various substituted styrenes were also carbonylated to the corresponding substituted…
A simplified n-ZnO/p-Si heterojunction has been prepared by growing n-type ZnO rods on p-type silicon wafer through the chemical vapour deposition method. The reflectance spectrum of the sample shows an independent absorption peak at 384 nm, which may be originated from the bound states at the junction. In the photolu…
The absorption and fluorescence spectra of nanocrystalline aggregates of Y2O3 doped with Er3+ are reported between 8K and room temperature. The nanocrystalline particles were synthesized from a homogenous solution of the metal ions and urea at elevated temperatures in order to control the precipitation of the mixed hy…
A new interpretation of the pretransitional temperature behavior of the static dielectric permittivity and its derivative in terms of the basic thermodynamic quantities: the internal energy, the entropy, and the Helmholtz free energy is presented. It was shown that in the case of strongly polar mesogenic compounds (as…
This paper reports the first direct experimental measurement of electromigration-induced stress in aluminum interconnects, using a series of microrotating stress sensors. The build-up of stress gradients in interconnect metallization, which is concomitant with backstress, has been previously investigated theoretically…
We present a novel three-dimensional thermal sensor based on Single-Walled Carbon Nanotubes (SWNTs) utilizing dielectrophoretic (DEP) assembly. The sensor is fabricated using a hybrid assembly technique combining top down (fabrication of the microplatform) and bottom up (DEP assembly) approaches. Encapsulating the str…
Polycrystalline, nanometer-sized powders of La1-xSrxMnO3with x=0.25 and 0.45 were prepared by a citrate gel technique and annealed at 600, 700, and 800degC in air for a period of 3 or 10 h. This synthesis technique resulted in the characteristics of the nanoparticles being highly reproducible from different, but ident…
A brief review of early Raman studies of oxide minerals is given, emphasizing aspects yet to receive modelling. To these are added extensive unpublished infrared data on α- and β-cristobalite SiO 2 and AlPO 4 , following a soft mode and its damping from 132 cm −1 at 20 K to about 80 cm −1 just below the AlPO 4 α–β tra…
A new configuration of composite right/left handed (CRLH) metamaterial structure is proposed, which comprises of TE-resonant dielectric resonators and metallic parallel mesh plates. The balanced CRLH transmission lines are designed by adjusting the optimal distance between the mesh plates for a given size of the mesh…
The compatibilization of natural rubber (NR)/ethylene‐propylene‐ethylidenenorbornene (EPDM) rubber blends was performed by using anhydride‐ and mercapto‐functionalized copolymers. EPDM functionalized with mercapto (EPDMSH) and anhydride groups (EPDM‐g‐MA), as well as ethylene‐vinyl acetate copolymer (EVA) functionaliz…
The in situ observation of polarization reversal of a system with 90° domain wall structures at a low-frequency field was carried out in the c -plate of a ferroelectric Bi 4 Ti 3 O 12 crystal using a polarizing microscope. It was found that there are four kinds of typical modes in polarization reversal with respect to…
Laser surface engineering can be used to alter the surface of alloys and produce a fine microstructure, usually improving the corrosion resistance and wear resistance. In the present paper, a CO2 laser was used to melt preplaced Mg20Al80 powder with the objective of improving the corrosion resistance of ZM5 magnesium…
The authors have previously demonstrated that a carbon nanotube (CNT) gas sensor can detect SF6decomposition byproducts generated by partial discharges (PDs). There are several factors to be considered, however, before applying the CNT gas sensor to practical diagnosis of a gas-insulated switchgear (GIS). In this pape…
Damage concerns, such as substrate/film material alterations, damage, and delamination of thin films, have become a central problem in sub-100 nm particle removal applications. In the laser induced plasma (LIP) removal technique both LIP shockwave and radiation heating are potential sources of thermomechanical damage.…
 \n\t\n\t\tA response by K. Wittmaack to a letter to the editor about his article “In search of the most relevant parameter for quantifying lung inflammatory response to nanoparticle exposure: particle number, surface area,†which appeared in the vol. 115, 2…
Mass attenuation coefficient, effective atomic number, and electron density of 12 organic acids, acetic acid (C2H4O2), acrylic acid (C3H4O2), benzoic acid (C7H6O2), butyric acid (C4H8O2), citric acid (C6H8O7), formic acid (CH2O2), lactic acid (C3H6O3), malic acid (C4H6O5), oxalic acid (C2H2O4), salicylic acid (C7H6O3)…
The effects of different parts of extract from medicinal plant Conyza canadensis, used to control bleeding, on human blood platelet aggregation in vitro were investigated. Aqueous extract of Conyza c. from young or old plants, glycoconjugate part, polysaccharide part and aglycon part at the concentrations above 0.75 m…