Materials Literature
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We present a low-temperature (73 K) study of the optical properties of multi-layer type II InP/GaAs self-assembled quantum dots by means of surface photovoltage (SPV) spectroscopy, taking advantage of its high sensitivity and contactless nature. The samples contain 10 periods of InP quantum dot planes separated by 5 n…
Template synthesis in polyethylene terephthalate (PET) membranes has been used to grow hour glass shaped nickel nanowires with a constriction in the range of tens of nanometers at the center. Anisotropic magnetoresistance measurements have been performed on a single nanowire to follow magnetization reversal of the str…
In the framework of real time real space time-dependent density functional theory we have studied the electron-ion dynamics of a hydrogen-terminated silicon surface H-Si(111) subjected to intense laser irradiation. Two surface fragments of different sizes have been used in the simulations. When the intensity and durat…
High-magnetic-field measurements of the magnetic moment of single crystals of yttrium orthoferrite were performed by torque and vibrating sample magnetometers. We investigated the magnetic states before and at the end of the field-induced spin reorientation and compared them with the theoretical predictions given by a…
This contribution presents an extended analytical model of permanent magnet synchronous motors that covers magnetic saturation effects for the fundamental wave and harmonic behaviour. Based on the extended motor equations a compensation scheme for saturation induced current harmonics is introduced, which is based on a…
Droplet-free metal plasma sources are a promising technology for enhancing the adhesion of deposited films to a smooth surface. High-power pulsed sputtering (HPPS) plasma is an arc-free glow discharge plasma with an instantaneous power consumption of several tens of kilowatts, although the average power consumed is th…
A series of AgBr/TiO2visible photocatalysts with heterojunction structure was synthesized using Ti(OC4H9)4, KBr, and AgNO3as precursors. The phase composition, particle morphology and size, microstructures, and absorbance of these photocatalysts were characterized by X-ray diffraction, transmission electron microscope…
It is well known that the smaller the size of low-dimensional objects the lower melting temperatures they have. This effect is described in its various manifestations in numerous both old enough and comparatively recent publications. However, for quite objective reasons, the mechanisms of the observed phenomena in low…
Prediction of extent and liklihood of corrosion-induced cracking in reinforced concrete bridge decks
The high pressure equation of state response of hot pressed bismuth trioxide (Bi2O3) powder compacts is determined through a series of parallel plate impact gas-gun experiments. Loose powders of Bi2O3 are hot-pressed to an average density of 9.202 g/cm3, corresponding to 96% theoretical maximum density. Shock compacti…
To accurately evaluate the Ge metal-insulator-semiconductor (MIS) interface trap density (Dit) by employing the conventional method for Si MIS capacitors on Ge MIS capacitors, we have investigated the impact of majority and minority carrier responses on C-V curves and/or the energy distributions of Dit. It is found th…
We report a study on the mechanical properties of magnetorheological (MR) fluids prepared with porous iron particles with rough surfaces. These particles were obtained by reducing a magnetite precursor in a H2 atmosphere at 400 °C. Small-amplitude dynamic oscillatory and steady shear flow measurements were carried out…
This paper presents a transformerless topology of series active power filter with capability to protect sensitive loads against harmonics, sags, swells and unbalances of the power system voltages. The proposed topology is constituted by three isolated H-bridge with a voltage source at the DC side. The series active po…
To reduce quality loss of fresh-cut green beans, different packaging systems were studied. In particular, samples were packaged in micro-perforated and no-perforated films and stored at 5 °C; unpackaged fresh-cut green beans were also stored at the same temperature as the control. Headspace gas concentrations, mass lo…
The properties of Cu-doped TiO(2) nanoparticles (NPs) were independently controlled in a flame aerosol reactor by varying the molar feed ratios of the precursors, and by optimizing temperature and time history in the flame. The effect of the physico-chemical properties (dopant concentration, crystal phase and particle…
Rice grain-shaped, nitrogen-doped titanium dioxide (N-TiO2) nanostructures are synthesized using sol-gel method and followed by electrospinning. The as-spun composite fibers are sintered at 500 °C for 1 h in air. SEM images of the sintered samples showed rice grain-shaped nanostructures. The nanostructures were made u…
We investigate the influence of the carrier density and other parameters on the interlayer exchange in magnetic thin-film systems. The system consists of ferromagnetic and nonmagnetic layers where the carriers are allowed to move from layer to layer. For the ferromagnetic layers we use the Kondo-lattice model to descr…
We report a low-cost, mask-free, reduced material wastage, deposited technology using transparent, directly printable, air-stable semiconductor slurries and dielectric solutions. We have demonstrate an emerging process for fabricating printable transistors with ZnO nanoparticles as the active channel and poly(4-vinylp…
The luminescence properties of InGaN/GaN multiple-quantum-well light-emitting diodes (LEDs) with different quantum-well (QW) thicknesses were investigated. It is found that with decreasing the QW thicknesses, the integrated intensities of the photoluminescence (PL) and electroluminescence (EL) peaks demonstrate a cont…
We show that hydrogen titanate (H(2)Ti(3)O(7)) nanotubes form strongly associated reversible nano-bio-conjugates with the vital respiratory protein, cytochrome c. Resonance Raman spectroscopy along with direct electrochemical studies indicate that in this nano-bio-conjugate, cytochrome c exists in an equilibrium of tw…