Materials Literature
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A porous silicon lm (PS) was investigated by FTIR, Raman and photoluminescence (PL) spectroscopies. The Raman and PL spectra were obtained using four different laser excitations: 488, 514, 633 and 782 nm. The analysis of the first order and second order Raman scattering lines permits to identify the band energy struct…
Hydrothermally synthesized pyrophyllites (400° and 450 °C at 1 kbar for 7 days) have been compared to natural pyrophyllite in its dehydroxylation behaviour using infrared emission spectroscopy (IES). Upon heating to 750 °C dehydroxylation results in the loss of one OH group and the H associated with the next OH group…
<div class="htmlview paragraph">The lower temperatures encountered with European Stage III/IV turbo charged direct injection (DI) Diesel engines with additional features such as cooled exhaust gas recirculation (EGR), compared to Stage II engines, means that modern light duty Diesel engine exhaust gas will rarel…
We have investigated the anisotropic molecular orientation of poly [4, 4'-oxydiphenylene-1, 2, 3, 4-cyclobutanetetracarboximide] (CBDA-ODA) films induced by irradiation with linearly polarized ultraviolet light (LPUVL). The molecular orientation was monitored by measuring the polarized infrared (IR) absorption spectra…
The temperature-frequency behavior of the permittivity ϵ' (T, f) and tan[δ(T, f)] (5—300 K, 100 Hz-1 MHz) were comparatively studied in nominal pure KTaO3 and K1-xLixTaO3 (x = 0.001, 0.01 and 0.03) doped by Cu and Fe single crystals. In the ϵ' (T, f) behavior doping of KTaO3 by Fe (1 wt%) and Cu (0.8 and 3 wt%) result…
The fracture process of steel fiber/cementitious matrix composites has been studied using a single‐fiber pullout test that permits detailed measurements of the load‐crack opening displacement relationship during fiber debonding and unloading. Using a suitable analytical model, the interfacial fracture energy and inter…
A new, thermally curable, aqueous acrylic resin is introduced as duroplastic binder for automotive trim parts. This one-component resin has good storage stability and crosslinks upon heating to 180–220°C. Wood fibers are impregnated with the resin using the blow-line technique and can be further processed to fiber mat…
Er 3+ singly- and Er3+/Yb3+-codoped fluorozirconate glasses were prepared. The upconversion emission intensities of the Er3+ ion around both 550 and 660 nm were measured under 800 nm excitation. The absorption band of the Yb3+ ion is located around 980 nm. Though the absorption band of Yb3+ does not interact directly…
The unit-cell parameters of lead phosphate, Pb(3)(PO(4))(2), have been measured by single-crystal X-ray diffraction in a diamond-anvil cell under hydrostatic conditions to a maximum pressure of 6 GPa. The compound undergoes an improper ferroelastic phase transition at 1.81 +/- 0.01 GPa at 298 +/- 1 K from a low-pressu…
Amorphous CN:Ti films deposited by using the reactive magnetron sputtering method were annealed in vacuum under 200 to 600° C. Incorporation of Ti (less than 3 at.%) has brought some new perspectives to the material. Electron-energy-loss spectrum indicates improved conductivity in CN:Ti films as in the insulating CN f…
A series of aliphatic 1, 4-diaminobutane based polyamides 4. y with y = 8, 9, 10 and 12 was synthesized and characterized. For comparison, some 1, 6-diaminohexane based counterparts were also studied. PA 4.12, and in particular PA 4.10, proved to have a very beneficial combination of T m , crystallization rate and phy…
O presente trabalho trata da preparação e caracterização de membranas de quitosana porosas e densas, que possuem diversas aplicações tecnológicas. Para tanto, foram utilizadas as técnicas de microscopia (microscopia eletrônica de varredura - MEV - e microscopia de força atômica -MFA), titulação potenciométrica e espec…
Ge nanoparticles were deposited on thinned Si substrates in an ultrahigh vacuum molecular beam epitaxy instrument (UHV-MBE) and transferred into an UHV-field emission transmission electron microscope (UHV-FE-TEM) through an UHV-transferring system. TEM observation indicated that the Ge nanoparticles had a round shape…
Summary Hardsetting of soil comprises two contrasting, unfavourable physical conditions at different water contents, namely extreme hardness when dry and complete slaking when wet. This behaviour was changed by adding small amounts of ferrihydrite and aluminium hydroxide to the soil. The aggregation and its stability…
A model-independent maximum-entropy method is presented which will produce a structural model from small-angle X-ray diffraction data of disordered systems using no other prior information. In this respect, it differs from conventional maximum-entropy methods which assume the form of scattering entities a priori . The…
The new objective evaluation method of seam pucker reported in Parts I and II of this study is used to analyze the effects of sewing parameters on seam pucker with five shape parameters in this part of the series. The parameters of sewing thread tension and stitch length are varied. To measure needle and bobbin thread…
Individuals of the wild silkworm, Bombyx mandarina, collected in South Korea (Taegu City) and Japan (Tsushima Islands and Fukuoka City) had the chromosome number of 2n = 54, while those collected in China (Hangzhou City) had the chromosome number of 2n = 56. Analysis by PCR (polymerase chain reaction) showed that the…
The thermal decomposition of some polyhydroxyalkanoates (PHA) has been investigated by means of thermogravimetry and differential thermogravimetry. The thermal stability of the studied polyesters decreases slightly with increasing hydroxyvalerate (HV) comonomer. This result is different from those reported in the lite…
The title compounds were obtained by reacting stoichiometric quantities of the corresponding dialkalimonochalcogenide, germanium powder and chalcogen at 1073 K. The four compounds are isostructural, crystallizing in space group C2/c, Z = 4 with K 4 Ge 4 S 10 : a = 15.161(3), b = 15.198(2), c = 8.760(2) Å, ß = 105.36(3…
Abstract We review some recent research developments on structure development during drawing of poly(ethylene terephthalate) film, and we report a study of constant‐load drawing of amorphous PET film at temperatures of 120°C and 132°C, including the effects of redrawing high‐temperature drawn film at lower temperature…