Materials Literature
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Article Redetermination of the crystal structure of calcium sulphate dihydrate, CaSO4 · 2H2O was published on December 1, 2002 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 217, issue JG).
Abstract The products and mechanism of the thermal oxidative degradation of poly(ethylene oxide) at 150 °C have been analysed using 13 C NMR spectroscopy. The analysis was assisted by the use of distortionless enhancement by polarisation transfer spectra, longitudinal relaxation time measurements, long‐range 13 C 1 H…
Abstract Partially hydrogenated soybean oil, referred to as soywax, is gaining attention as a renewable and biodegradable alternative to paraffin wax for use in candles. However, current soywax candles suffer from several problems, especially poor melting and solidification properties. Fully hydrogenated soybean oil e…
number of planar silicon light-emitting devices are designed and realized in standard 1.2 and 2-mm complementary metal oxide semiconductor (CMOS) integrated circuitry. The devices yield optical power intensities of up to 0.2 mW/cm2 (up to 0.2 nW per 100 mm2) at operating voltages from 4 to 31 V and at currents of 0.1…
Abstract The copolymerization of 1,8‐naphthalimide derivatives (as fluorophore) with acrylonitrile has been investigated. The photophysical characteristics of monomeric and polymeric fluorophores in N , N ‐dimethylformamide solution have been determined and discussed. During copolymerization, no changes in the chromop…
This paper presents a combined finite-element and analytical modeling technique for the prediction of force-density harmonics in salient-pole synchronous machines. The model calculates the induced currents in the damper winding cage and includes their effect on force-density components in the solution. Use of a combin…
The effect of gamma-radiation doses (5, 10, 30 kGy) on the mechanical properties, gas and water vapour permeability, infrared (IR) spectra, and overall migration into aqueous and alternative fatty food simulants of commercial monolayer flexible packaging films ethylene vinyl acetate (EVA), high-density polyethylene (H…
The dielectric properties of silicon carbide SiC have been measuredusing cavity perturbation technique. Three tubes with diameter 2 mm, 3 mm,and 5 mm were filled with the powerful material of SiC. The measurementswere taken for each tube at different frequencies 0.615 GHz, 1.412 GHz, 2.214GHz, 3.017 GHz and 3.820 GHz…
Porphyrins and phthalocyanines have now been assembled in a multitude of different architectures, each of which may be identified with a different scenario of the coupling acting between the porphyrins. The synthetic flexibility of these compounds makes possible the design of particular molecules for specific applicat…
The synthesis of refractory Mg‐Al spinel aggregates from bauxites and magnesias was addressed by applying the alumina–magnesia–silica ternary equilibrium phase diagram as the fundamental basis. Four different alumina sources (bauxites) and four different magnesia sources were investigated. These were fired in air thro…
Abstract The program SIR2002 , the heir of SIR2000-N , shows two important new features: a) a figure of merit which is able to recognize the trials potentially able to provide the correct solution; b) a procedure capable of exploiting electron density distributions misplaced with respect to the correct origin. The two…
In the production of cotton and polyester JetRing spun yarns, spindle speed, air pressure, and yarn twist level affect yam hairiness. However, the distance between the front roller nip and the nozzle inlet has only a marginal effect on yam hairiness. Results also show that JetRing spun yams have a much lower numbers o…
A melt-spun Mg-1.5%wtCa-6wt%Zn alloy was analyzed by means of transmission electron microscopy, energy dispersive X-ray spectroscopy, and scanning transmission electron microscopy. The as-solidified alloy exhibited both spherical matrix precipitates and elongated precipitates at the grain boundaries (grain-boundary fi…
Copper (Cu), despite being an essential micronutrient, may be toxic whenever it occurs in the soil solution at high concentrations. Chemical reactions that control copper availability in the soil–plant system are complex. Copper can be found in both organic and inorganic soil fractions. This work studied Cu adsorption…
The second-harmonic generation (SHG) response of unsubstituted subnaphthalocyanines (SubNcs) has been measured for the first time by electric field-induced second-harmonic generation (EFISH) (1.064 and 1.90 μm) and hyper-Rayleigh scattering (HRS) (1.064 μm) experiments. The quadratic hyperpolarizability derived from t…
The dependence of the elastic moduli of a nanocrystal on its size is investigated theoretically with reference to a two-dimensional single-crystal strip. It is shown that the uncertainty (of a fundamental nature) in the size of a nanocrystal causes the determination of many of its mechanical characteristics to be ambi…
Abstract Some soils from the western Amazon region contain KCl-extractable Al contents 5 to 10 times greater than is typical for highly weathered soils containing predominantly kaolinite and gibbsite. We studied a soil sequence from the Brazilian western Amazon consisting of two Typic Udifluvents on the levee of the J…
Nanosized CoAl 2 O 4 and ZnAl 2 O 4 powders with particle sizes of 67 and 6.5 nm are synthesized under hydrothermal conditions at 245°C for 20 h. The precursors are reacted at different temperatures to provide intermediate phase transformations using X‐ray diffraction (XRD), infrared (IR) spectra, and thermal gravity…
Abstract The weathering of chlorite in hydrothermally-altered basalt was studied with XRD, TEM and electron microprobe to determine the type and orientation of secondary minerals. Optical examination indicated chlorite assemblages to have altered in two distinct microsites: one microsite near micro-fissures traversing…
Abstract Polyvinylidene fluoride (PVDF) membranes were surface‐modified using fluorinated surface‐modifying macromolecules (SMMs) additives. The membranes were prepared using the phase‐inversion method. Two novel SMM formulations were used. The effect of some relevant parameters, such as the solvent evaporation time,…