Materials Literature
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The Mössbauer spectra of the quasi-one-dimensional semiconductor antiferromagnets TlFeS2 and TlFeSe2 are analyzed. It is shown that complete compensation of the magnetic moments is violated in the quasi-one-dimensional antiferromagnetic domains of TlFeS2 and TlFeSe2 due to spin fluctuation (spin flops). In this case,…
Abstract An amphiphilic peptide that adopts a random-coil or β-sheet conformation depending on the pH of the dissolved aqueous solution forms a monolayered fiber array when a mica substrate is immersed in the random-coil solution. The random-coil peptide adsorbed on the substrate spontaneously transforms into a fibrou…
Isotropic electrically conductive adhesive with epoxy matrix filled with silver flakes was modified with addition of multi-walled silver nanotubes and with silver nanoparticles. Samples of adhesive as received and modified adhesive were formed. Part of the samples was aged in increased temperature, in increased humidi…
The dynamic viscosities of In-Bi and Ag-Yb alloy systems are measured by the torsional oscillation viscometer and the corresponding melt fragilities (M) are calculated from the temperature dependence of viscosities fitted by the Arrhenius equation. It was found that the melt fragility of the intermetallics is larger t…
Abstract The paper presents a short description of the model of the phenomenon of droplet spreading in presence of a liquid film, as well as the experimental facility, calculations methodology and results of experimental research concerning determination of the boundary angle at which droplet begins to slide on the ho…
To get basic information on corrosion of metals under sewage sludge environment, in this work, the corrosion behavior of SAE1045 steel under SiO2 gel with 3 wt% NaCl was investigated by electrochemical polarization method. The results show that the self-orrosion potential of the steel move to more negative value in Si…
Some effects induced by laser treatment in GeS2 glasses, glass-ceramics and selected chalcogenide crystals are presented. We show that thermal treatment of glasses or introducing controlled disorder in crystal lattice give the opportunity to make the desired changes in the optical and electrical properties of material…
The modified polyacrylamide/organic montmorillonite (PAM/OMMT) flocculant was prepared by in-situ intercalation polymerization with acrylamide monomer and OMMT under CO2 inert atmosphere. The OMMT was synthesized with MMT and cetyl trimethyl ammonium bromide (CTAB) as intercalation agent by cationic exchange reaction.…
The hydration performance and pore structure of fly ash-cement (FC) pastes were investigated by means of XRD, TG, ex-situ leaching (ESL) and MIP. The results reveal that the influence of curing age to the kinds of hydration products of FC pastes is unconspicuous. As the content of fly ash increase, the Ca(OH)2 content…
Took the heavy cylinder rolling mill as subject investigated, which is used to produce the nuclear power cylinder, the large hydrogenation reactor cylinder and the coal liquefaction reactor cylinder. And the cylinder rolling mill has two drive rolls which is different from conventional ring rolling mill. The rolling t…
The use of nanocarriers to deliver drugs to tumor tissue is one of the most important strategies in cancer therapeutics. Recently, gold nanorods (GNRs) have begun to be used in cancer therapy because of their unique properties. The purpose of this study was to show the potential that GNRs have against human nasopharyn…
Transverse flux switched reluctance motors enable the application of a large MMF per pole to a machine with a large number of poles. This paper will investigate the difficulties of building these machines and their advantages and shortcomings. Electrical, magnetic and mechanical difficulties are investigated and ways…
Nanoscale manipulation of properties of drug delivery systems (DDSs) provides improved control over the pharmacokinetics and pharmacodynamics of encapsulated drugs relative to free drugs. This article summarizes the preparation and therapeutic applications of paclitaxel–gelatin nanoparticles (PGNs) (Type B, 75 Bloom)…
Owing to the volatilization of isopropanol (IPA), instability in the alkaline texturization of monocrystalline silicon has been a big problem for a long time. Many additives were adapted to replace IPA, such as high boiling point alcohols. In this experiment, as a new attempt, sodium lauryl sulfate (SDS), a type of an…
Abstract In order to obtain nanopatterned surfaces, natural allophane particles originating from Japanese soils were immobilized as single particles on Si wafer substrates.When derived from aqueous suspensions, only a few nanoparticles were deposited and detected on the surface due to the weak adsorption of allophanes…
Multi-walled carbon nanotubes were obtained by catalytic chemical vapor deposition. Ethylene was applied as the carbon source and nanocrystalline iron without support was used as the catalyst. In order to remove amorphous carbon, the samples were reduced under hydrogen atmosphere. As a result of this process cementite…
Abstract. This paper presents an analysis allowing for the determination of the differential equation describing the circuit of the active filter inverter output current control with an additional measurement of input voltage. The resulting equation allows to determine the conditions that ensure stable operation of th…
Ingeniería Investigación y Tecnología es una publicación trimestral, arbitrada, de investigación científica y tecnológica editada e impresa por la Facultad de Ingeniería de la UNAM. Su propósito es difundir información y conocimientos originales e inéditos relacionados con la ingeniería. Es un espacio para profesores,…
The effect of cerium and/or gold addition to a manganese oxide which was greatly active in CO oxidation was studied. The catalysts obtained by this way were characterized by N2 adsorption, XRF, XRD and TPR, and their catalytic activity was measured in the CO oxidation reaction. The pure MnOx catalyst was active in the…
A description of a novel rolling contact fatigue test for evaluation of bearing steel characteristics is presented. Unlike traditional approaches where bearings are tested until failure, the proposed testing method is based on monitoring the material response during testing. The measurement principles are based on cha…