Materials Literature
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Abstract The new monoclinic oxide borates Na 2 RE 2 (BO 3 ) 2 O (RE = Dy, Ho) were synthesized using standard solid-state reactions in the temperature range 900 - 950 ◦ C. They are isotypic to the known phases Na 2 RE 2 (BO 3 ) 2 O (RE = Y, La, Nd, Sm-Gd, Er). The single crystal X-ray structure determination of Na 2 D…
Niobian rutile (Ti 4+ 0.63 Nb 5+ 0.14 Fe 2+ 0.11 Ta 5+ 0.08 Fe 3+ 0.02 W 6+ 0.01 Sn 4+ 0.003)� 0.99 O2 from the Greenbushes granitic pegmatite, Western Australia, contains lamellae (~5 � 50 � m in size) of disordered ferrocolumbite (Fe 2+ 0.80 Mn 2+ 0.12 Ti 4+ 0.07)� 0.99 (Nb 5+ 1.48 Ta 5+ 0.28 Ti 4+ 0.13 W 6+ 0.09 Sn…
The morphology and order-to-disorder transition (ODT) of solutions of a low molecular weight poly(styrene- b -ethylene- alt -propylene) in squalane were studied by four different methods: DSC, modulated DSC, rheology, and small-angle X-ray scattering (SAXS). The ordering from disordered micelles to the BCC morphology…
The dielectric barrier corona discharge (DBCD) in a wire-cylinder configuration and the dielectric barrier discharge (DBD) in a coaxial cylinder configuration are studied. The discharge current in DBD has a higher pulse amplitude than in DBCD. The dissipated power and the gas-gap voltage are calculated by analyzing th…
Ca1-xLa xTiO3 powders were prepared by the polymeric precursor method. X-ray diffraction (XRD), FT-Raman spectroscopy, transmission electron microscopy (TEM), and N2 and CO2 adsorption were used for the microstructural and surface characterization of the powders. Room temperature photoluminescence (PL) was observed in…
Este trabalho teve por finalidade analisar algumas características de misturas de solo, cimento e cinzas de bagaço de cana-de-açúcar para sua possível utilização na fabricação de materiais alternativos de construção. Para tal, amostras de cinzas de bagaço de cana-de-açúcar foram submetidas a um tratamento prévio que c…
The development of X-ray photoelectron spectroscopy (ESCA, XPS) is reviewed from an historical perspective that is relevant to its use for analytical chemistry. The emphasis is on early development of the technique, primarily during the period, 1964–1977. During these years there were significant developments in instr…
Plasma sprayed metal end connections of metallized film capacitors are the weak link for pulse power applications which involve discharge times of tens of microseconds and less. This problem will only get worse with increased capacitor energy density. The present contribution quantifies the relationship between the "q…
A framework is presented for understanding charging processes in low vacuum scanning electron microscopy. We consider the effects of electric fields generated above and below the specimen surface and their effects on various processes taking place in the system. These processes include the formation of an ionic space…
A simple kinetic model of temperature-dependent processes accompanying the writing and decay of diffraction gratings in a polymer matrix doped with azo-dye chromophores under illumination with spatially modulated and linearly polarized light is introduced and studied using Monte Carlo simulations. The model generalize…
Abstract We have created one‐ and two‐dimensionally structured polymer networks dispersed in a liquid‐crystal solvent using a holographic exposure technique. These structures have potential for electrically switchable, reverse‐mode, polarization selective and non‐selective diffractive optical elements. Using a simple…
O processo de peletização consiste na aglomeração por via úmida de pós de uma substância ativa e excipientes sob a forma de unidades esféricas. Estas unidades esféricas, denominadas pela expressão anglo-saxônica pellets, diferem de grânulos obtidos pelo processo clássico de granulação no que respeita às característica…
A description of the preparation of zirconium oxide (ZrO2) polycrystalline powder by the sol–gel method is presented. To prepare ZrO2 powder to be used as a thermoluminescent (TL) phosphor in dosimetric application, it is necessary to analyze some structural properties before, such as it’s crystallinity. In this work,…
We have grown single crystals of a Li 6 Gd(BO 3 ) 3 :Ce (LGBO:Ce) scintillation phosphor modified with sodium. The thermostimulated luminescence curves of the crystals of Li 6− x Na x Gd(BO 3 ) 3 :Ce (0.1< x <0.3) exhibit, in addition to the peak at 425 K observed for the initial compound, a new intense peak at 362 K.…
Abstract The average molecular weight and molecular weight distribution of polyhydroxybutyrate can be affected by different bacterial strains, different cultivation time and also different carbon sources. Food waste was proven to have a high potential in the induction of biosynthesis of polyhydroxybutyrate with differ…
The first fabrication and heating test of a large-scale carbon-fiber-composite (CFC) monoblock divertor mock-up using an annular flow concept has been performed to demonstrate its manufacturability and thermomechanical performance. This mock-up is based on the design of the lower part of the vertical target of the Int…
Some recent results concerning the synthesis of carbon nanostructures in a thermal plasma generating by a plasma torch are presented. Several tests were carried out in different operational conditions. The plasma was formed with argon and different gas mixtures of argon-acetylene or argon-methane to which some catalys…
In this study, we attempt to determine the knittability of a yarn before knitting. Thirty different yarns are knitted into 1 × 1 rib structures with three different loop length values. The knitting process is observed and the number of machine stops, yarn breaks, and holes are recorded. The results of experiments are…
The reactivity of phthalonitrile, tetrafluorophthalonitrile and 4,5-dibutoxyphthalonitrile with unmodified surfaces of ZnO and SiO 2 and with the modified systems SiO 2 / Cp 2 Co , ZnO / Cp 2 Co , SiO 2 / Zn ( AcAc ) 2 prepared by deposition of cobaltocene ( Cp 2 Co ) and zinc acetylacetonate Zn ( AcAc ) 2 , was studi…
A homologous series of chiral swallow-tailed materials, I(p,q,m,n), derived from (L)-lactic acid was synthesized for investigation of the effects of variation of the molecular core structure and the terminal swallow-tailed group on the formation of mesophases. The mesophases and their corresponding transition temperat…