Materials Literature
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We studied Aharonov-Bohm effect on thin graphite single crystals containing columnar defects (nanoholes) produced by irradiation with heavy ions. The thickness of irradiated single crystals has been varied from 50 nm down to less then 1 nm by thinning the thicker samples with beam-plasma etching. For irradiated sample…
The X-ray diagnostic is one of the main diagnosis tools in medicine and its role, in public health, depends on the quality of the exams, the regulatory responsibility fits, mainly, in the National System of Sanitary Surveillance. With this perspective, it was developed a mathematical evaluation model of potential risk…
A multiscale numerical model is developed to predict the thermal radiative properties (TRP) of rough La2NiO4+δ coatings. The model integrates intrinsic and extrinsic contributions related to the chemical composition and the texture, respectively. High-temperature infrared reflectivity and thermogravimetric measurement…
A series of quaternary tellurite glasses {[(TeO2)70(B2O3)30]90 [Ag2O]10}100-z {AgI}z with z = 5, 8, 10, 13 and 15 mol% were fabricated by rapid quenching technique. Pulse echo technique was employed to detect the longitudinal and shear ultrasonic velocities generated by 5 MHz transducer room temperature. Elastic prope…
Cosmioneis Mann et Stickle is a pennate diatom in the family Cosmiondeidaceae and order Naviculales. A single species of this genus (Navicula pusilla W. Sm., now Cosmioneis pusilla (W. Sm.) Mann et Stickle), had been previously reported from the island of Oahu, in the Hawai'ian archipelago. In extensive surveys of alg…
This work shows the results of various analysis on a representative clay sample from southern west of Tunisia, particularly from Oued Tfal near the town of Gafsa. The raw smectite contains some carbonate, quartz, chlorite, and anorthite. During the attack of the carbonate clay with a solution of hydrochloric acid, a c…
Spin-dependent tunneling properties for the metal-semiconductor-oxide diode which was fabricated using ferromagnetic ZnMnO nanocrystals and Ti-Co ferromagnet were investigated. The diode revealed current oscillation packets after tunneling-on, and the peak-to-valley current ratio of the packets showed to be dependent…
Single layers of Zn x Cd 1−x Se with five different compositions and thickness of 400 nm have been prepared by thermal vacuum evaporation, through alloying of ultra thin ZnSe and CdSe films with equivalent thickness of 0.12, 0.25 or 0.37 nm. The deposition was carried out on rotating substrates kept at room temperatur…
Characterization of the shock response of biological materials is required in order to develop an understanding of how such materials behave under high strain-rate loading. In this work, a predominately linear Us-up Hugoniot relationship for a rendered porcine fat has been established using the plate-impact technique.…
This paper presents a method for loss calculation, including core losses and winding losses, and temperature rise in high frequency transformer design under forced-air convection. Analytical models of winding losses for multiple-layer copper foil and Litz wire windings with MMF boundary conditions have been developed.…
The removal of thiocyanate, a toxic anion originating in a large number of industrial processes, from aqueous solutions was investigated using adsorbents of different natures (activated carbon, zeolite, diatomite, sepiolite, hydrotalcite, steel-making residues). The uptake of thiocyanate anions did not seem to be dire…
Polarization optical, electron microscopic, and thermomagnetic investigations of FePd single crystals undergoing an A 1 → L 1 0 phase transformation have been carried out. The results obtained have been analyzed proceeding from the concept of ferroelasticity and the experimental criteria of its existence. The features…
Polycrystalline multiferroic PbFe 0.5 Nb 0.5 O3 (PFN) fabricated by a solid-phase method is studied. Before sintering, a synthesized PFN powder is processed in Bridgman anvils via a force action in combination with shear deformation (FASD) at room temperature. The electrophysical properties and structural parameters o…
Top-down critical dimension scanning electron microscopy (SEM) is still the workhorse metrology tool used for nanoscale structure analysis, such as measurement of photoresist features, during integrated circuit manufacturing. However, the degree to which top-down SEM imaging can accurately be used to quantitatively de…
We report on the structural, chemical and optoelectronic properties of Fe-doped ZnO films deposited by dc magnetron sputtering. The effects of sputtering and post-growth thermal annealing conditions on structural and optical properties of ZnO films with different Fe contents were investigated by x-ray diffraction, XPS…
In this study, we report that the addition of ammonium hydroxide (NH 4 OH) significantly enhance the properties of extruded WG-based materials. The grainy structure disappeared and the extrudate became more uniform and glossy. The barrier properties improved and the oxygen permeability at dry conditions was as low as…
For clear observation of diatom frustules, both inner- and extracellular impurities need to be eliminated from samples. This process is usually performed using oxidizing acids that can completely decompose organic matter. However, oxidizing acids often result in dissociation of frustules, and if oxidative byproducts a…
We obtained minimum-energy structures for 13 [Formula: see text] (p = 1–4) species by a combined taboo search and density functional theory (DFT) approach. The putative global minima are all [Formula: see text] core-shell structures. There is a stabilization energy on the order of 0.5 to 1.0 eV associated with complet…
As the size of Eu3+-doped phosphors decreases in nanoscale, the top of the valance band is elevated and the zero-phonon charge transfer (CT) energy is decreased; the rigidity of the lattice environment is decreased and the CT state (CTS) coordinate offset is enlarged. The decrease in zero-phonon CT energy and the enla…
We investigated low-temperature SiO x conversion methods for the spin-coated perhydropolysilazane (a diluted dibutyl-ether solution) films prepared on (100) Si substrates under different curing schemes. From the Fourier transform-infrared (FTIR) spectroscopy and refractive index (RI) measurements, conversion to high-d…