Materials Literature
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We have developed a nonconventional broadband electron spin resonance (ESR) spectrometer operating continuously in the frequency range from 0.5 to 9 GHz. Dual antenna structure and the microwave absorbing environment differentiate the setup from the conventional one and enable broadband operation with any combination…
RESUMO São apresentados os resultados do levantamento florístico das diatomáceas epilíticas no curso superior do rio das Antas, estado do Rio Grande do Sul. As coletas foram realizadas mensalmente, de julho de 2005 a fevereiro de 2006, em quatro estações amostrais entre 1.030 e 1.005 m de altitude. Um total de 38 espé…
(Na0.52K0.44Li0.04)Nb 0.9-x Sb x Ta 0.1 O 3 lead-free piezoelectric ceramics are prepared by a solid-state reaction method. With increasing Sb content, the transition temperature from orthorhombic to tetragonal polymorphic phase decreased. A composition (Na 0.52 K 0.44 Li 0.04 )Nb 0.863 Sb 0.037 Ta 0.1 O 3 is found to…
Neste trabalho, realizou-se a caracterização de compósitos confeccionados com polietileno de alta densidade "virgem" (v-HDPE) e diferentes tipos de serragem gerados na indústria moveleira. Os compósitos foram produzidos por extrusão, utilizando-se uma extrusora monorrosca de 35 mm e temperaturas de 160 ºC, 170 ºC e 18…
This paper reports ionic conductivity of yttria‐stabilized zirconia (YSZ)–Al 2 O 3 composite membranes. The tape cast specimens were subjected to binder burnout (500°C) and sintering (1550°C) processes to obtain 200–300 μm thick membranes. The ionic conductivity and microstructure of the membranes were characterized a…
Novel nanocomposites based on the biodegradable polymer poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) (PHBHx) and layered fillers, specifically layered silicate (clay25A) and expanded graphite (EG), were prepared by melt intercalation. The dispersion of the fillers in the PHBHx was characterized by wide‐angle X‐ray di…
Abstract Despite decades of study, the fundamental mechanisms of superplasticity, particularly relating to the accommodation of grain boundary sliding, are still widely disputed. This is partly due to a lack of information on individual grain deformation and sliding events. Previous studies of superplasticity using su…
Blown-powder laser surface alloying was performed on the magnesium alloy AZ91D with Al–Si alloy powder to improve corrosion resistance. Characterization by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD) analysis revealed that intermetallic compounds (IMCs) of Mg2Si…
The structural, electronic, and vibrational characteristics and energies of the isolated polyoxide clusters B20O30, Al20O30, V20O50, Si20O30H20, and Si20O30F20 and their complexes with the H− ion and ammonia complexes Al20O30 · nNH3 have been calculated by the density functional theory B3LYP method with different basi…
Characteristics of corona discharges over insulating surfaces are described. Two insulating materials, PTFE and porcelain are compared and contrasted using identical insulator surface profiles and dimensions and identical impulse voltage waveforms. The insulators were in the form of right cylinders and of similar shap…
Polyterthiophene (P3T) film was synthesized on Types 304 (UNS S30400) and 316 (UNS S31600) stainless steel (SS) electrodes from an acetonitrile (ACN) solution containing 10–2 M terthiophene (3T) and 10–1 M lithium perchlorate (LiClO4), by cycling voltammetry between 0 and 1.20 V, with a scan rate of 25 mV/s. The elect…
Undesirable surface flashover of high voltage support structures can severely limit the compactness of open air high voltage systems. Only recently, increased effort has been invested in characterizing and quantifying the physical processes involved in surface flashover occurring under atmospheric conditions and under…
We have conducted electromigration tests on Cu/low-k standard short-line structures as well as those with varying numbers of reservoirs. We found that the presence and number of reservoirs as well as current direction relative to the reservoir led to markedly different electromigration performance in terms of lifetime…
The phase transformations of natural hexagonal pyrrhotite have been studied by high-temperature x-ray diffraction and thermogravimetry during heating in an inert atmosphere, and its unit-cell parameters have been measured during heating to 1060 K.
The synthesis characterization and conductivities of polyaniline/expanded vermiculite intercalated nanocomposite are presented in this paper. The conductive emeraldine salt form of polyaniline is inserted into the interlayer of expanded vermiculite to produce the nanocomposite with high conductivity. The structures an…
Squeezing of a periodic, highly concentrated emulsion of deformable drops through a dense, simple cubic array of solid spherical particles at zero Reynolds number is simulated by considering one drop in a periodic cell. The particles are rigidly held in space. The drops with nondeformed diameter comparable with the pa…
The aerosol deposition method (ADM) is effective for the preparation of thick films at a high deposition rate. We studied magnetic properties and electromagnetic wave suppression properties of Fe–ferrite film prepared by ADM. The Fe–ferrite film prepared by ADM showed a remarkable electromagnetic interference (EMI) mi…
The physicochemical characteristics of chitosan differ with the preparation conditions. Thus, it is necessary to control the different parameters which influence the N-deacetylation reaction so as to produce chitosan with the characteristics required by its final applications. Samples of α-chitin used in this report w…
A novel microstrip phase shifter is presented using metamaterial structures. The phase shifter is composed of complementary split-ring resonators (CSRR) and complementary electric-LC (CELC) resonators to realize the 180 degrees of phase difference. The added insertion loss is only 1.33dB at 16.8GHz in a transmission l…
Ligand field theory has been applied for the first time to the corrosion inhibition behavior of iron with inhibitors such as aniline, benzimidazole, mercaptobenzimidazole and aminobenzothiazole, copper with aniline and benzimidazole, iron with substituted ethane derivatives, and titanium with nitrophenols and nitroani…