Materials Literature
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Esta revisión se dedica al ajuste de parámetros para modelos cinéticos de degradación térmica de polímeros usando termo gravimetría. Primero se describen los fundamentos del análisis de datos y se resumen las ecuaciones básicas. Luegol os modelos cinéticos se clasifican según estas categorías: isotérmicos, diferencial…
Influence of the growth temperature on the luminescence properties of Eu,Si-codoped AlN was studied by means of SEM, XRD and CL. The Si and Eu concentrations were fixed at 2.2 and 0.1 at%, respectively, while the growth temperature was varied from 1600 to 1950°C. The synthesized Eu,Si-doped AlN powders emit in the ult…
High specific heats of the magnetic regenerative material, at the temperatures lower than 20 K, is crucial for a regenerative cryocooler to reach a liquid-helium temperature. The hydrogenation of the magnetic regenerative materials ErNi and ErNi2 may change their structures, magnetic properties and specific heats, whi…
New p-tert-butyl thiacalix [4]arene derivatives containing simultaneously the 4-amidoazobenzene and ethoxycarbonyl fragments at the lower rim in cone and 1,3-alternate conformation of tri-and tetrasubstituted derivatives, correspondingly, were synthesized. It was shown that the replacement of the hydroxyl group by eth…
Chemical analyses conducted on the surface of rock slabs under a combination of two X-ray spectrometry methods, wavelength dispersive XRF and energy dispersive XRF, are used to establish a geochemical correlation between the studied samples. This proves to be an excellent method for the characterization of volcanic gl…
We reported the fabrication of an FTO conducting thin film via a spray deposition method, which was used to investigate the effect of oxygen content in the carrier gas on deposited film morphology and properties. Using a carrier gas containing various O 2 /N 2 concentrations (0%, 20%, 50%, 80%, and 100%) led to signif…
The possibility of local modulation of the macropore diameter has been investigated for macropores at different pore depths on pre-patterned low-doped p-type silicon (p-Si) substrates. Using electrolytes based on HF/organic solvents, it is relatively easier to vary the diameter of deep pores compared to shallow pores.…
Triglycine sulfate crystals (TGS) are an important class of ferroelectric materials. TGS have attracted many researches because of thier room temperature ferroelectric nature. TGS found wide applications in electronic and optical fields. In present work, pure and ADP-, KDP- (0.2 mol) doped TGSP crystals are grown from…
A graphene–inorganic hybrid material has been fabricated by coupling Eu(III) complexes onto graphene oxide (GO) (denoted as Eu-GO hereafter). Successful coupling has been verified by 1H NMR, CHN elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP) for Eu3+ content, and Fourier transform in…
A review is given on the application of the reflectance ellipsometry for optical characterization of bulk materials and thin films with thickness between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>λ</mml:mi></mml:mrow></mml:math>/20 and 2<mml:math xmlns:mml="http://www.w3.org/199…
As part of a factory acceptance test program for high voltage motors, end users sometimes specify a black-out test. This is a traditional offline inspection where the stator is placed in complete darkness, each phase is energized to 115% of rated line-to-neutral voltage, and both ends of the stator are observed to det…
Wave propagation characteristics of partial discharge (PD) pulses in underground medium voltage cables are important when online PD monitoring system is implemented for cable diagnostics and condition assessment. There are three important parameters that can influence the wave propagation characteristics along a cable…
A facile and novel strategy for preparing polyaniline/polyvinyl alcohol (PANI/PVA) composite emulsion is reported wherein the reaction is carried out via the emulsion polymerization using ammonium peroxydisulfate (APS) as the oxidizing agent and dodecylbenzene sulfonic acid (DBSA) as the protonic acid. The PANI/PVA co…
Final properties and behavior of polymer parts are known to be directly linked to the thermomechanical history experienced during their processing. Their quality depends on their structure, which is the result of the interactions between the process and the polymers in terms of thermomechanical kinetics. To study the…
Power system oscillations arise from various sources. One contributor that is difficult to quantify during operation is the induced (air-gap) torque. This paper presents a new approach for measuring the instantaneous air-gap torque in real-time for synchronous generators. This is achieved through recent progress in na…
Eu 2+ doped M-phase BaAl 2 Si 2 O 8 phosphors have been synthesized by the solid state reaction. The structure, photoluminescence and relations between the structure and luminescence have been investigated and discussed. These phosphors showed the Eu 2+ broad band excitation and emission spectra. The excitation band c…
The present work introduces a new procedure to obtain gold nanoparticles (AuNPs). AuNPs (77–213 nm) were obtained in the absence of any classical reducing agents in a medium containing Mg 2+ /Al 3+ layered double hydroxide (LDH) and N,N ‐dimethylformamide. XRD analysis showed the presence of crystalline phases of gold…
Copper and zinc are common elements in paint residues and can be toxic to estuarine organisms. This study aims to determine the labile dissolved and labile particulate fractions (LPFs) of copper and zinc in the estuarine waters of a shipyard in southern Brazil under different salinity levels and in different seasons.…
PbSe quantum dots ( QD s) were grown in high‐refractive‐index low‐melting‐temperature lead‐phosphate glass. The lowest energy exciton transition of the QD s was tuned over a wide range within the infrared spectral region (0.93–2.75 μm) by a controlled heat treatment. The measured QD radius ranged between 2 and 5.3 nm,…
A novel structure of dual-composite right/left-handed transmission line (D-CRLH-TL) is proposed in this paper, and its electromagnetic characteristics are investigated in theory and simulation. The dispersion curve of the proposed structure has been derived by using Bloch-Floquet theory. The structure is composed with…