Materials Literature
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Abstract We consider the effect of structural heterogeneity on the movement of the slug-parasitic nematode, Phasmarhabditis hermaphrodita. The study involves image recording and analysis of nematode movement on a homogeneous layer of technical agar compared to movement of nematodes in a structurally heterogeneous envi…
La nanociencia y la nanotecnología se presentan como un área nueva de investigación en el estudio de los materiales donde convergen diversas ramas del conocimiento que permiten estudiar fenómenos inéditos que ocurren a nivel atómico y molecular. La importancia de la nanotecnología radica en que en mundo nanométrico lo…
Low density polyethylene nanocomposites were prepared by melt intercalating maleic anhydride grafted polyethylene and montmorillonite clay. It has been found that maleic anhydride has promoted strong interactions between polyethylene and montmorillonite, leading to the homogeneous dispersion of clay layers. Rheologica…
Porous materials with residual phosphonic -P(O)(OH) 2 groups (2.6-3.5 5 mmol·g -1 ) were synthesized by acidic treatment of nonporous xerogels containing =Si(CH2) 2 P(O)(OC2H5)2 functional groups. Elemental analysis, IR and solid-state NMR data clearly show that the structure of the functional layer of such xerogels i…
The flow instability in a flow front during the injection stage of injection molding process was theoretically investigated for polymeric materials. In addition, the relationship between the flow instability and flow mark on the surface of injection moldings was also examined. According to the theory, the flow in the…
Recently the authors have observed in compounds of the 4,n-alkyloxybenzoic acid series, with the homologous index n ranging from 6 to 9, a texture transition in the nematic range which subdivides the nematic phase in two sub-phases displaying different textures in polarised light analysis. To investigate a persistence…
Multiferroic BiFeOδ ceramics of various oxygen contents (δ) were prepared by solid state reaction. Frequency dependence of dielectric properties of BiFeOδ samples at room temperature was measured in the frequency range from 40Hz to 1MHz with a HP4294A precision impedance analyzer. For all the samples, the dielectric c…
The ultraviolet light emitting diode based on n-ZnO-nanowire/p-Si heterojunction was fabricated. Quasi-arrays of ZnO nanowires were grown on p-Si substrates using a simple low-temperature hydrothermal method that would be easily extended to mass production. As-grown ZnO nanowires showed good crystallinity, a preferabl…
Abstract An up-to-date summary of our coupled macroscopic (lattice parameter, a 0 ) and microscopic (Mössbauer) studies on the entitled systems is given, shedding new light on the basic phase and structure properties of these technologically important, highly defective oxides. Through these studies, the intermediate-p…
In this research work the behaviour of LDPE nanostructured compounds under the action of surface partial discharges (SPD) is investigated. Films of unfilled LDPE and of LDPE nanocomposites were subjected to the action of SPD by the application of an AC voltage. The breakdown of the film specimens was chosen as the end…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Liquid silicone rubber (LSR) materials have been applied since more than 20 years as elastomeric housing materials of composite insulators. Process technology and material formulations were developed to meet the high quality requirements that are necessary for HV outdoor applications. LSR rubbers are typically applied…
The combined application of electron microscopy (EM) is frequently used for the microstructural investigation of biological specimens and plays two important roles in the quantification and in gaining an improved understanding of biological phenomena by making use of the highest resolution capability provided by EM. T…
The electrochromic properties of WO 3 thin films with a LiPON ͑lithium phosphorous oxynitride͒ protective layer and of an electrochromic device composed of WO 3 and V 2 O 5 with a LiPON protective layer prepared by radio-frequency magnetron sputtering were investigated.The WO 3 film and the electrochromic devices ͑gla…
X-ray spectra from highly charged tungsten ions have been observed in the interaction with an electron beam at energies ranging from 14 to 1.5 keV by using an electron beam ion trap (EBIT). In this energy range, resonant x-ray transitions at around 9 keV predominantly take place through dielectronic recombination proc…
TECHNOLOGICAL AND ENVIRONMENTAL APPLICATIONS. Cerium based-compounds have great importance in a wide range of technological applications, such as: fuel cell devices development; metallurgic processes, petroleum refining; glass and ceramic production. Recently, its catalytic properties have been also explored for envir…
An electrodeposition condition to anodically prepare CuO films using slightly acidic solutions of copper acetate (pH 5.5–6.4) is established. The plating solution and solutions with related compositions were investigated using cyclic and linear sweep voltammetry to elucidate the deposition mechanism. The key oxidation…
First of all, hydrogen energy related government budgets in Japan, USA and EU were summarized. Among a number of required technology to introduce hydrogen society, the hydrogen storage technique was focused in this article. The technique is classified in three ways, such as pressurized hydrogen, liquid hydrogen and hy…
We investigate nanocomposites, that is, dispersions of magnetite nanoparticles in an epoxy resin, by means of broadband dielectric and magnetic spectroscopy. The molecular dynamics of the polymer matrix is altered by the nanoparticles. Due to the formation of agglomerates neither permittivity nor permeability can be d…
Elastic deformations induced by an electric field in homeotropic nematic layers with finite anchoring energy were studied numerically. A nematic material possessing flexoelectric properties and characterized by a positive dielectric anisotropy was considered. The ionic space charge and the ion transport across the lay…