Materials Literature
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Abstract Crosslinked isotactic polypropylene (iPP) was prepared by reactive blending using dicumyl peroxide and active sulfur. The modified material was characterized by means of several techniques: dynamic mechanical thermal analysis, differential scanning calorimetry, Fourier transform infrared spectroscopy, and nuc…
Two novel axial-disubstituted silicon(IV) phthalocyanines (compounds 1 and 2) have been prepared by introducing paracetamol (a common antipyretic analgesic) or its isomer 4-hydroxyphenylacetamide at the axial positions of silicon(IV) phthalocyanine, respectively. Their photophysical and biological properties have been…
Dielectric relaxation measurement of 1-Hexanol (1-HE), 1-Propenol (1-PR) & their complex have been carried out over the entire concentration range using time domain reflectometry technique at 300 K in the frequency range of 10 KHz to 20-GHz. Bilinear calibration method is used to obtain complex permittivity ¿*(¿) from…
The paper presents a new driving mechanism made of SMA (Shape Memory Alloy), with which the robot is designed with advantages of light weight, compact structure, less joints, easily machined, etc. The robot is driven by energy which transformed by compression spring using SMA actuator when heating or cooling, and whic…
A microstrip patch antenna (MPA) has been fabricated using a conducting polymer (CP), polypyrrole (PPy) as radiating patch on a transparent 3 mm thick PlexiglasTMsubstrate. The bulk DC conductivity of the PPy patch is 2000 S/m and its thickness 120 μm. The MPA was designed for operating at 2 GHz. A similar antenna wit…
We describe a general-purpose thermoelectric temperature controller with 1 mK stability, 10 mK reproducibility, and 100 mK absolute accuracy near room temperature. The controller design is relatively simple and could be readily modified for use in different experimental circumstances. We also describe a time-domain nu…
International audience
The effect of the partial substitution of Fe by Co and Mn on the structural and magnetic properties of Fe-Pd alloys has been investigated by means of calorimetric, magnetic and neutron diffraction measurements. The addition of Mn increases both the reversible and irreversible MT temperatures whereas the addition of Co…
The phase transformation of magnetite to h-Fe3O4 was investigated at high pressure and temperature by in situ resistivity measurements in a multi-anvil press. Experiments at pressures≤9 GPa show similar resistivity paths during heating and cooling, indicating the stability of magnetite. During heating at 10 and 12 GPa…
O objetivo deste trabalho foi avaliar a aplicação de quitosana no controle da podridão-amarga da maçã em pós-colheita e seus efeitos sobre Colletotrichum acutatum e a atividade da peroxidase nos frutos. Frutos previamente infectados com o patógeno foram imersos em suspensões de quitosana com diferentes concentrações e…
Carbamazepine was used as a well characterised model compound to assess three polymorph screening methodologies. It has been shown that parallel crystallisation followed by in situ analysis by XRPD is an excellent way of generating and analysing new solid forms of a substance in situ. Further methodologies utilising a…
An X-ray fluorescence technique has been developed for determination of the macroscopic composition of As-S-Se, As-S, and As-Se chalcogenide glasses. Reference samples for calibration have been prepared by direct elemental synthesis. The calibration error has been estimated.
Abstract The effects of Y 2 O 3 and Er 2 O 3 on the sintering behaviors, thermal properties and microstructure of AlN ceramics were investigated. The experimental results show that the sintering temperature can be decreased; the relative density and thermal behavior can be improved by adding rare earth oxide in AlN ce…
UNLABELLED: Chitosan is a D-glucosamine polysaccharide derived from chitin that displays an antimicrobial activity against bacteria and fungi. OBJECTIVE: to evaluate the antifungal effect of high molecular weight chitosan (HMWC) in clinical strains of Candida spp. METHODOLOGY: the susceptibility of forty strains of Ca…
Extremely thin diamond-like carbon (DLC) films are deposited by the filtered cathodic vacuum arc (FCVA) and plasma chemical vapour deposition (p-CVD) methods. The target thicknesses of the extremely thin protective DLC films deposited on a Si (100) surface by FCVA and p-CVD are 0·1, 0·4, 0·8, 1·0, 2·0, 5·0 and 100·0 n…
This paper treats approximate solutions for a self-folding problem of carbon nanotubes. It has been observed in the molecular dynamics calculations (Buehler, Kong, Gao, and Huang, 2006, “Self-Folding and Unfolding of Carbon Nanotubes,” ASME J. Eng. Mater. Technol., 128, pp. 3–10) that a carbon nanotube with a large as…
This paper reports on the results of investigations of the crack growth kinetics in glasses under different test conditions (in media containing moisture and under vacuum with the complete removal of water from the glass surface) in the test temperature range from room temperature to 430°C. The specific features of th…
Fiber optic reflectometry (FOR) and scanning electron microscopy (SEM) were used to study the regularities of the etching of a single-mode optical silica fiber with a germanium silicate core in subcritical and supercritical water. It was demonstrated that the rate of etching of the germanium silicate core, being highe…
RESUMEN. Catálogo de las algas verdes cocales de las aguas continentales de Andalucía. En España los estudios realizados de los ecosistemas acuáticos continentales han tenido sobre todo un enfoque ecológico. En la mayoría de los trabajos limnológicos las algas se han considerado como productores primarios en su conjun…
Abstract : This thesis investigates the use of porous materials in a multi-layered armor concept. The prototype layered structure consists of an initial high-strength material to slow down the projectile and cause significant plastic deformation, followed by an orthotropic wave-spreading layer to spread shock waves la…