Materials Literature
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ZnSe sub-microstructures with different morphologies, sizes, and microstructures were synthesized by a modified vapor deposition method using CdSe nanocrystals (NCs) as the seeds. On the basis of the appearance of the as-synthesized products, we show that the substrate temperature and CdSe NCs are the critical factors…
The aging of insulating materials and insulating systems involves physical and/or chemical changes of the insulating material. These changes in turn lead to changes in the dielectric response of the insulating system. Quantitative measurements of the dielectric response function can be performed using either time or f…
In inverter-fed motor coils, surge voltages with the rise time of several tens or hundreds of nano-second may cause partial discharge (PD) and degradation of electrical insulation performance of the inverter-fed motor coils. This paper discusses PD inception characteristics as well as PD propagation characteristics af…
Mouse embryonic stem cells were cultured on commercially available biodegradable macroporous microcarriers. A culture period of 1-2 weeks was needed to colonize the microcarriers. Embryonic stem cells retained their pluripotency for up to 14 days when cultured in medium supplemented with leukemia inhibitory factor. Re…
Abstract Metal nanoparticle (NP)–polymer nanocomposite thin films are attractive for applications in various devices. Since bimetallic NPs provide additional opportunities for tuning the physical properties of the NP components, the development of bimetallic NP nanocomposite thin films should lead to further enhanceme…
Two models of interacting bubble dynamics are presented, a coupled system of second-order differential equations based on Lagrangian mechanics, and a first-order system based on Hamiltonian mechanics. Both account for pulsation and translation of an arbitrary number of spherical bubbles. For large numbers of interacti…
When a high-frequency ac voltage is applied to ZnS:Cu,Cl and ZnS:Cu,Mn,Cl devices, optical fluorescence, known as ac electroluminescence (EL), is observed; it depends on both the Cu (Mn) and Cl dopants. The local structure of these compounds was studied using the extended x-ray-absorption fine-structure (EXAFS) techni…
Non-covalent porphyrin dyads and triads containing N 3 S porphyrin and RuN 4 porphyrin subunits were synthesized by treating meso-pyridyl-21-thiaporphyrin with RuTPP(CO)(EtOH) in toluene at refluxing temperature. The dyads and triads were characterized by various spectroscopic techniques and the properties were compar…
Abstract The influence of hard magnetic strontium ferrite filler content on the structure, vulcanization characteristics, magnetic and mechanical properties of rubber blends was studied. The variations of rubber–ferrite composites properties were evaluated as a function of ferrite and carbon black loading by applicati…
Hydrated CeO 2 nanowires as thin as 5 nm in diameter and nanoneedles with various aspect ratios were obtained via a chemical precipitation technique in the presence of ammonium acetate. It was possible to control the particle size, shape and agglomeration by tuning the ammonium acetate concentration in the experimenta…
This paper discusses a technique for improving the homogeneity of the magnetic field of tube-like permanent magnets designed for magnetostrictive devices. The high homogeneity of the magnetic field along the tube is achieved by gradually changing shape or remanence of combined short rings. The analysis of the field in…
Silver thin films were deposited on SiO2 and polyethylene naphthalate (PEN) using e-beam evaporation. X-ray diffraction techniques were used to investigate the influence of substrate morphology on the Ag film’s texture. Different modes of texture were observed in Ag thin films on SiO2 and PEN. Detailed information reg…
Novel Poly(l-lactic acid) (PLLA)/ Multi-walled carbon nanotubes (MWNTs)/ hydroxyapatite (HA) nanofibrous scaffolds with high porosity and well-controlled pore architectures were prepared via electrospinning techniques. The structure, morphology, molecular weight change of the scaffolds were investigated using scanning…
Silicon layers grown on oxidized Si surfaces at temperatures between 400 and 500°C exhibit intense photoluminescence (PL) in the D1 region after annealing at high temperatures (up to 1100°C). This PL is associated with structural defects that are formed due to the mechanisms of Si growth and thermal relaxation. The gr…
In this paper, we summarize the magnetic and electromagnetic non-destructive testing techniques and devices based on the magnetostrictive delay line principle. Three main techniques are presented. The first is based on surface crack and defect detection on ferromagnetic surfaces by measuring the corresponding magnetic…
In this study we report an experimental determination of the segregation coefficients of some elements in commercial titanium alloys. The methods used are point analysis of as-cast alloys and analysis of zone-melted samples. The as-cast samples for point analysis consisted of laboratory arc-cast ingots and also of sec…
Abstract The synthesis and characterization of two new (TTF‐DNP‐CBPQT 4+ ) [2]rotaxanes 1 and 2 is reported, based on tetrathiafulvalene (TTF), 1,5‐dioxynaphthalene (DNP), and cyclobis(paraquat‐ p ‐phenylene) (CBPQT 4+ ) with cyclohexyl and alkyl chains as the spacers. Multilayer Langmuir–Blodgett (LB) films of [2]rot…
The luminescence properties of Eu3+:Al2O3 powders prepared via low temperature direct combustion synthesis was investigated. It was observed that the heat treatment of the powders modifies the dynamics of the radiative transition D05→F27 of Eu3+ (1.0mol%) and produces an enhancement of the luminescence intensity by ne…
The loss density of the nanocrystalline material is experimentally characterized up to 500 kHz and above 1 Tesla in this paper. Flux density and loss density of the material under high operating temperature (150°C) are calibrated and reported. The core preparing effect on magnetic loss density is also identified by ex…
The lowest threshold energy of ion bombardment for cubic boron nitride (cBN) film deposition is presented. cBN films are prepared on positively biased Si (100) substrates from boron trifluoride (BF3) gas in the high-density source region of an inductively coupled plasma with mean ion impact energies from 45 down to a…