Materials Literature
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The problems with the production processes of dry season sorghum (Masakwa) are low output due to the use of strenuous traditional tool, extension of transplanting period due to complete absence of modern machinery, non-uniformity of transplanting depth and plant spacing, and lack of water due to the proximity of the f…
Combustion synthesis (CS) of high content of α-Si3N4 powders was carried out using Si and Si3N4 pow- ders as reactants with the addition of diazenedicarboxamide (AC) at a relatively low N2 pressure of 3 MPa. The phase compositions and microstructure of products were characterized by XRD and SEM. Effects of AC contents…
The surface of magnesium electrode was coated by immersing in phosphate, tungstate, molibdate and cerium solutions, after polishing with sand paper and abrading in 0.15 M HCl solution for 20 seconds. The corrosion of modificated magnesium with different compounds was investigated by electrochemical methods in 1 M NaCl…
Abstract Hibiscus sabdariffa stem fiber has 73.9% cellulose, high mechanical strength and is found in abundance throughout the world. Hibiscus sabdariffa graft copolymers were synthesized, characterized by FTIR, XRD, TGA, DTA, and SEM techniques, and evaluated for physicochemical changes in properties such as moisture…
Precipitation effects in age-hardenable Mg-13wt.%Tb alloy were investigated in this work. The solution treated alloy was subjected to isochronal annealing and decomposition of the supersaturated solid solution was investigated by positron annihilation spectroscopy combined with transmission electron microscopy, electr…
The yarn pullout test is a suitable method for investigating the internal mechanical properties of the fabric structure which is established during the weaving or knitting process. In this study, a theoretical model is presented to estimate the stored energy of plain-knitted fabrics which is determined using yarn pull…
The magnetic properties and magnetocaloric effect (MCE) of TmTiO3 single crystal were studied by magnetization and heat capacity measurements. A large reversible MCE was observed at the Curie temperature TC of 65 K, which is related to a second-order magnetic transition from paramagnetic to ferrimagnetic state. The va…
This study describes the fabrication of ZnO-nanowire films by electro-chemical anodization of Zn foil. The ZnO films are characterized by field emission scanning electron microscopy, X-ray diffraction patterns, and transmission electron microscopy, respectively. The ultraviolet (UV) photo-response properties of the su…
Features of the formation of Au/Ni/〈C〉/ n -Ga 2 O 3 hybrid nanostructures on a Van der Waals surface (0001) of “layered semiconductor-ferroelectric” composite nanostructures ( p -GaSe〈KNO 3 〉) are studied using atomic-force microscopy. The room-temperature current-voltage characteristics and the dependence of the impe…
In this paper, the epitaxial graphene layers grown on Si- and C-face 6H—SiC substrates are investigated under a low pressure of 400 Pa at 1600 °C. By using atomic force microscopy and Raman spectroscopy, we find that there are distinct differences in the formation and the properties between the epitaxial graphene laye…
The total conductivity (σT) in the β-phase and δ-Bi2O3 doped with Tb4O7 system was measured in the composition range between 1 and 30 mol% Tb4O7 at different temperatures. According to the DTA/TG results, this tetragonal type solid solution was stable up to about ∼740°C, and the solubility limit was found at ∼5 mol% T…
We determined the magnetic symmetry groups (Shubnikov groups) of the wurtzite-type crystals doped with magnetic atoms periodically distributed at cation sites. The magnetic groups of doped crystals with ferro- or antiferromagnetic properties arise from the P63 mc (C 6 4 ), P3m1 (C 3 1 ), C 3 (Cm) or C 1 1 (P1) ordinar…
The conventional mechanisms with stiff joints make the robots more complex, heavy, large and expensive. As walking robots are requested to perform tasks in rough terrain, the development of actuators capable to flexibly adapt to the unstructured environment becomes more and more necessary. Biological mechanisms like l…
This paper reports on a study of the luminescence emitted by Li6Gd(BO3)3: Ce3+ crystals under selective photoexcitation to lower excited states of the host ion Gd3+ and impurity ion Ce3+ within the 100–500-K temperature interval, where the mechanisms of migration and relaxation of electronic excitation energy have bee…
In this work, it is demonstrated how a novel technique based on temperature-programmed chemical vapor deposition (TPCVD) can be used to investigate the synthesis of carbon nanotubes (CNTs) from methane on a classic catalyst FeMo(x)/MgO (x = 0.07, 0.35 and 1.00). TPCVD monitors carbon deposition by measuring H2 formed…
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In the field of organic thin films, manipulation at the nanoscale can be obtained by immobilization of different materials on platforms designed to enhance a specific property via the layer-by-layer technique. In this paper we describe the fabrication of nanostructured films containing cobalt tetrasulfonated phthalocy…
Under immersed and we-dry cyclic conditions, the deterioration processes of the organic coating on carbon steel surface have been comparatively studied using electrochemical techniques. The wet-dry cycles were carried out by exposure to 4 h immersion and 4h dryness (4-4h cycles) and 12h immersion and 12h dryness (12-1…
A practical approach to design composite right/left-handed unit cells is presented which is based on the impedances obtained by even-odd mode excitation. Typical cell characteristics including the balancing condition are derived in terms of poles and roots of these impedances. In a design process based on EM-simulatio…
Vorliebe für Krebszellen: Zeolith-L-Nanokristalle wurden enantioselekiv funktionalisiert und als enantiomorphe selbstorganisierte Monoschichten (SAMs) angeordnet. Das Adhäsionsverhalten verschiedener Zellen an diesen neuen Biomaterialien wurde bezüglich der Chiralität der entsprechenden Oberfläche untersucht. Dieses K…