Materials Literature
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Tm 3+ /Er 3+ -codoped gallate bismuth lead (GBL) glasses are prepared and characterized optically. Broadband near-infrared fluorescence spectra composed of Er 3+ 1.53 µm emission from the 4 I 13/2 → 4 I 15/2 transition and Tm 3+ 1.47 µm emission from the 3 H 4 → 3 F 4 transition are recorded under 793 nm excitation wa…
Common ERP systems do not solve the support for workshop management.This paper shows why and under what conditions computer support for workshop schedules is necessary.Demands on the quality of operation plans, factors having an influence on the scheduling process and criteria for selection of appropriate operations a…
We study the effect of transversal electric-field (E-field) on the electronic properties of multilayer armchair-graphene-nanoribbon (AGNR). The bandgap in multilayer-AGNRs can be reversibly modulated with the application of E-field. At optimized widths, we obtain a semiconductor (SC) to metallic (M) and a M-SC transit…
The modification of acicular alpha of TC21 titanium alloy during hot rolling was investigated for finer grains under the condition of optimized preheating time. Two different preheating schedules were used to roll TC21 alloy plates at strains of 0.36, 0.69, and 1.2. The results show that preheating time has a great ef…
In this study, a natural polymer, chitosan (CS) has been converted through modified procedures to produce a water-soluble nontoxic form that has been evaluated as a novel potential antitumor drug. CS was carboxymethylated and then further modified in mild aqueous medium via graft copolymerization using a new simple an…
Shape memory polyurethanes are usually fabricated with low-molecular weight polyols through a two-step copolymerization, which often results in difficulty attaining both desired shape memory switch temperature and optimal thermomechanical properties. Here we present a series of shape memory polyurethane copolymers hav…
This work looks at the fundamental question of how the surface mobility of drops in the composite state is related to the size scale of the roughness features of the surface. To this end, relevant literature is first reviewed and the important terms are clarified. We then describe and discuss contact and roll-off angl…
The extent of corrosion between a miniature steel ship model at different relative velocities of sea water fitted with commercial sacrificial anodes of aluminium (Al) in sea water and magnesium (Mg) in fresh water is studied. The experimental results show that the degree of cathodic protection represented by the catho…
The isothermal crystallization behavior and crystal structure of the polypropylene (PP) component in wood plastic composites (WPC) with respect to wood particle content and maleic anhydride-grafted polypropylene (MAHPP) compatibilizer were studied by means of polarized optical microscopy, scanning electron microscopy,…
The microstructure and the ferroelectric properties of mirrorlike polycrystalline PbTiO 3 thin films were studied as a function of the film thickness. Highly uniform PbTiO 3 films were deposited onto LaNiO 3 -buffered (100) Si substrates by liquid phase deposition at temperatures as low as 45 °C. The as-deposited film…
We investigated an effect of hydrostatic pressure ( P ) up to 14 GPa on a resistivity (ρ) of a hole-doped delafossite oxide CuCr 0.97 Mg 0.03 O 2 having an S = 3/2 antiferromagnetic (AF) triangular sublattice. In contrast to a non-monotonic P -dependence of ρ, an AF transition temperature ( T N ≈ T peak ) deduced from…
Self-consistent field theory is used to calculate free energy barriers and reaction rates for the spontaneous association and dissociation of micelles formed of block copolymers in a homopolymer matrix. The barriers are prohibitively large for copolymers of typical molecular weights when the unimer (free surfactant) c…
Due to their large surface-to-volume ratio compared to that of a bulk semiconductor, carbon nanotubes are very sensitive to their environment. Their properties can be dramatically changed by simple exposure to air. Here, we show that the electronic and optical properties of p-n diodes fabricated with single-walled car…
The self-assembly in diblock copolymer-based supramolecules, obtained by hydrogen bonding short side chains to one of the blocks, as well as in two-length-scale linear terpolymers results in hierarchical structure formation. The orientation of the different domains, e.g. layers in the case of a lamellar-in-lamellar st…
The superconducting (SC) state of iron-based compounds in both tetragonal and orthorhombic phases is studied on the basis of an effective Hamiltonian composed of the kinetic energy including the five Fe 3d-orbitals, the orthorhombic crystalline electric field (CEF) energy, and the two-orbital Kugel'-Khomski\u{i}-type…
A resonance Raman study of the polyyne molecule ${\mathrm{C}}_{10}$H${}_{2}$ encapsulated inside double-wall carbon nanotubes (C${}_{10}$H${}_{2}$@DWNT), excited with many different laser energies between 1.92 and 2.71 eV, is presented. A resonant enhancement of the Raman peaks of the polyynes was observed and the int…
The vibrational properties of vitreous GeSe(2) are studied within the Becke-Lee-Yang-Parr (BLYP) generalized gradient approximation to density functional theory. For this purpose, we consider two models. The first one is derived from a chemically ordered network, previously generated through classical molecular dynami…
We propose top-down processes to make silicon multiple quantum wells called fins for a light-emitting diode. The silicon fins are formed vertically to a substrate and embedded in a Si3N4 waveguide. By current injections into silicon fins, we have observed stimulated emission spectra peaked at the wavelengths correspon…
The reverse martensitic transformation was monitored by testing the x-ray diffraction patterns with increasing temperatures in an Ni 46 Mn 33 Ga 17 Cu 4 alloy. A large magnetization change from a weak-magnetic martensite phase to a ferromagnetic austenite phase has been found on the M – T curves of heating cycle in th…
The $D$ band Raman intensity is calculated for armchair edged graphene nanoribbons using an extended tight-binding method in which the effect of interactions up to the seventh nearest neighbor is taken into account. The possibility of a double resonance Raman process with multiple scattering events is considered by ca…