Materials Literature
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A new spin‐on‐glass (SOG) solution has been obtained by the hydrolysis of methyltriethoxysilane and dimethoxymethyl‐3,3,3‐trifluoropropylsilane. When the SOG film is cured at 360°C, it contains both trifluoropropyl and methyl groups and exhibits the dielectric constant of 3.0. Curing the SOG film at 450°C in nitrogen…
The effect of 2-hydroxyacetophenone-aroyl hydrazone derivatives on the inhibition of copper corrosion in 3N nitric acid solution at 303 K was investigated by galvanostatic polarization and thermometric techniques. A significant decrease in the corrosion rate of copper was observed in the presence of the investigated c…
One of the most important issues in producing composite materials is fibre sizing, due to the usual incompatibility between the fibres and the matrix. In the present work, the evaluation of an alkaline surface treatment of sugar cane bagasse fibres through Scanning Electron Microscopy(SEM), X-ray microanalysis, Fourie…
We consider a system modeling the flow of nematic liquid crystals with variable degrees of orientation. Although the set of constitutive equations involves many different parameters, the flow behavior is determined mostly by three nondimensional parameters, i.e., the Ericksen number, the Reynolds number, and the inter…
Solution (potentiometric, absorption, EPR) as well as solid state studies (X-ray, EPR, magnetic susceptibility) have shown that the binding ability of oxalodihydroxamic acid (H2oxha) with two hydroxamic groups next to each other differs distinctly from that observed for aliphatic dihydroxamic acids, HONHOC(CH2)nCONHOH…
This paper describes the effect of chemical interactions on the efficiency of removing iron sulfide scale. Most types of iron sulfide can be removed by inorganic acids. A corrosion inhibitor (amine-type chemical) is added to the acid to protect the well tubulars. In addition, a hydrogen sulfide scavenger (aldehyde typ…
ZnO arrester elements can fail by a number of mechanisms, including electrothermal instability and thermal stress-induced mechanical cracking in this brittle ceramic. Breakdown channels at the edge of the electrode are among the most common failure mechanisms at high currents. Such failures take the form of a melt pun…
A Halbach cylinder, fabricated from pre-magnetized sintered NdFeB magnet segments, is proposed for the powder aligning system during the compression or injection moulding of anisotropic bonded Halbach oriented NdFeB ring magnets. The influence of leading design parameters of the powder aligning system, viz. the number…
Article The Standard Enthalpy and Entropy of Formation of Rh2O3 - A Third-Law Optimization was published on January 1, 2000 in the journal High Temperature Materials and Processes (volume 19, issue 1).
A 9 mol% Y2O3stabilized ZrO2 specimen was annealed in boiling water for 1200 h, and the phase structure was examined by XRD and the chemical states of zirconium, yttrium and oxygen were examined by XPS. After annealing, the phase of the specimen remains entirely cubic, and the chemical states of the elements are not r…
The infrared emission spectra of CaF2–CaO–SiO2 melt were investigated by a method combining infrared emission spectroscopy and the hot-filament technique. Emission for spectra related to Si–O bond can be observed by this in situ technique. The influence of SiO2 and fluoride content on the spectrum was investigated, an…
Eddy-current loss in laminated steel cores is computed with unusual planar eddy finite elements over the wide frequency range produced in AC motor drives. The loss computed by the finite element method at low frequencies is shown to agree within 1% with a common simple formula. A formula used by radio-frequency engine…
ABSTRACT: Doxorubicin-loaded poly(butylcyanoacrylate) (PBCA) nanoparticles (NPs) were prepared by an emulsifier-free emulsion polymerization technique. The pH values of the polymerization medium and the weight ratios of doxorubicin to butylcyanoacrylate had a significant effect on the mean particle size. The particle…
YMnO3 single crystals were grown by flux method and plate-like single crystals with the c-axis perpendicular to the surfaces were obtained. The maximum size of these crystals was about 2 × 2 × 0.07 mm3. Ferroelectric properties were measured at various frequencies and abnormal behavior at the low frequencies were obse…
To improve the mechanical properties of blends of polypropylene (PP) and terpolymer of ethylene–propylene–diene (EPDM), a triblock copolymer, (PP-g-MAH)-co-[PA-6,6]-co-(EPDM-g-MAH), was synthesized by coupling reaction of maleic anhydride (MAH)-grafted PP (PP-g-MAH), EPDM-g-MAH, and PA-6,6. The newly prepared block co…
Edible films from wheat gluten were prepared with various amounts of glycerol as a plasticizer. Water vapor permeability, oxygen permeability, tensile strength and percentage elongation at break at different water activities ( aw ) were measured. Films with low amounts of glycerol had lower water vapor and oxygen perm…
Zircaloy-4, which is used widely as a core structural material in pressurized water reactors (PWRs), picks up hydrogen during service. Hydrogen solubility in Zircaloy-4 is low and zirconium hydride phases precipitate after the Zircaloy-4 lattice becomes supersaturated with hydrogen. These hydrides embrittle the Zircal…
The reactions of the tertiary phosphine oxides Ph3PO, Ph2MePO or Me3PO with hydrated yttrium(III) nitrate in ethanol gave the complexes [Y(R3PO)2(EtOH)(NO3)3] (R3PO = Ph3PO or Ph2MePO), [Y(Me3PO)2(H2O)(NO3)3], [Y(R3PO)3(NO3)3] (R3PO = Ph3PO, Ph2MePO or Me3PO), and [Y(Ph3PO)4(NO3)2]NO3. The species [Y(R3PO)4(NO3)2]NO3…
The thermal degradation of poly(ether imide) (PEI) was studied through a combination of thermogravimetric analysis and stepwise pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS) techniques with consecutive heating of the samples at fixed temperature intervals to achieve narrow temperature pyrolysis conditions.…
In order to evaluate the influence of partial discharges on the lifetime of power electronic circuits models of different defects are developed. These defects cause PD within the silicon gel used to embed the circuit because of electrical and mechanical reasons. The first model is a spherical void in the middle betwee…