Materials Literature
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Poly(silphenylenesiloxane)s containing hydride or vinyl functional side groups were successfully synthesized by deaminative polycondensation of bis(aminosilane)s having the functional groups with monomeric or polymeric bis(silanol). The bis(silanol) prepolymer was prepared by palladium-catalyzed dehydrocoupling polyme…
Improvement of chemical corrosion resistance of silicon nitride (Si3N4) ceramics is strongly desired from the industry side. However, there is presently not enough information on chemical corrosion. This paper investigates corrosion resistance of two kinds of commercialized Si3N4-based ceramics with different additive…
The Agora collection of copper alloys consists of mirrors, pins and needles, lamps, vases, tools, nails and other hardware, official weights, voting ballots, sculpture, jewelry, medical instruments, weapons, and coins excavated on the North Slope of the Acropolis and in the Ancient Agora of Athens, and is housed in th…
Poly(vinyl alcohol) (PVA) was coated onto polyethylene (PE) films by a repetitive adsorption and drying process, and then the PVA-coated PE films were alternately immersed into aqueous solutions of Ca2+ and CO3(2-) ions (alternate soaking cycles), to deposit calcium carbonate (CaCO3) onto the films. The PVA coating wa…
The aqueous solubility of guaifenesin, a highly water-soluble drug, in the presence of salts, sugars, and cosolvents was determined at 25 degrees C and 40 degrees C. The solubility of drug at both temperatures was reduced with increasing concentrations of salts and sugars. The extent of reduction in drug solubility wa…
Abstract The syntheses of polylactides (PLAs) with branched peptide end groups containing reactive (ionic) moieties such as amino or carboxyl groups are described and were used to prepare PLA‐based microspheres (MSs) with positively or negatively charged surfaces. Branched peptides with hydroxyl end groups and four pr…
The conductivity, photoconductivity and mesophase ranges of hexaalkoxytriphenylene (HAT)-based discotic liquid crystals are all increased by adding one equivalent of {hexakis(4-nonylphenyl)dipyrazino[2,3-f:2′3′-h]quinoxalene} (PDQ9). For some triphenylene derivatives, addition of PDQ9 induces liquid crystal behaviour,…
A model for predicting the wear profile of the ductile cast iron roll during rod (or bar) rolling is proposed using Archard's wear equation. Archard's wear equation was reformulated as an incremental form and the hardness of the roll was expressed as a function of rolling time under a high temperature. The wear profil…
Rolling was conducted at 373–673 K for AZ31 Mg alloy; mechanical properties of the rolled Mg alloy were investigated by tensile and blow forming tests. The grain sizes of all the rolled specimens were smaller than that of the specimen prior to rolling. At tensile temperatures under 373 K, the rolled specimens showed m…
Continuous-wave and pulse electron paramagnetic resonance (EPR) as well as electron-nuclear double resonance (ENDOR) techniques are applied for determination of the electronic and geometric structure of copper(II) complexes with terpyridine and related ligands that are relevant in the context of supramolecular chemist…
A 1% Pt/CeO 2 catalyst prepared by the solution combustion method shows a higher catalytic activity for CO oxidation by O 2 compared to Pt metal particles. At least six hydrogen atoms are taken up per Pt at -25 °C. The structure of 1% Pt/CeO 2 catalyst has been investigated by X-ray diffraction (XRD), transmission ele…
Crown ethers and terpyridine ligands have been successfully attached to the focal point of light harvesting phenylacetylene monodendrons through Pd-catalyzed coupling reactions. The structures of these functional monodendrons were characterized by 1H and 13C NMR spectroscopy, mass spectrometry and elemental analysis.…
- Ethylene-co-tetrafluoroethylene copolymer (ETFE) films were modified by four plasmas: direct and remote H2 plasmas and direct and remote O2 plasmas; and the hydrophobic recovery process of these plasma-modified surfaces was investigated using water contact angle measurements and angular XPS. The water contact angle…
SUMMARIES Seven kinds of traditional Chinese paper made recently, i.e. three types of xuan paper, daqian writing paper, fuyangxuan paper and wenzhou bast paper, were selected to investigate their strength and durability after accelerated ageing. The effect of jiaofanshui (animal glue with alum) as an acidic sizing age…
We have integrated a phase-change chalcogenide random access memory, completely based on 0.24 /spl mu/m-CMOS technologies. A twin cell and BL clamping circuits are introduced to enlarge fabrication tolerance and to reduce cell perturbation during reading operation. To draw back current as much as possible, Co salicida…
Based on molecular design,a novel biphenonl like monomer 4 (4′ hydroxyphenyl) 2,3 phthalazin 1 one (DHPZ) was originally synthesized through simple reactions from phenol and phthalic anhydride which are common and easily available chemicals.The synthesizing processes,reaction dynamics and mechanism were studied in det…
Presented is a method for active damping of oscillations between line reactance and filter capacitors in LC-filter for line connected current controlled pulse width modulated (PWM) voltage source converters. The idea is to include closed loop feedback control that controls the capacitor voltage oscillations to zero by…
Amorphous vanadium oxide ( a V 2 O 5 ) powders were prepared by acidifying aqueous NH 4 VO 3 solution with concentrated nitric acid. Samples having a different degree of layer stacking and surface area were obtained either by changing the NH 4 VO 3 concentration or by employing additional solvent exchange process. T…
This paper is in four parts. The first is related to general considerations and experimental analyses, and each of the others is related to different approaches to the theoretical analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced composites made of glass fibre. The objective is t…
The orientation dependence of pit propagation in single-crystal beryllium (Be) is compared to observations for single-crystal zinc (Zn). Pits formed on the prism planes of both Be and Zn were characterized by interiors which had crystallographically oriented, parallel plates of unattacked material. In Be, the orientat…