Materials Literature
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The effect of the surface concentration of submicrometer ammonium sulfate ( NH 4 ) 2 SO 4 dust particles on the mechanism of atmospheric corrosion of copper has been investigated at 298 K and 93% relative humidity (RH). For surface concentrations from 1 μg/cm 2 to 10 mg/cm 2 , the same corrosion products are formed at…
The advantages of producing 3-D conductive knitted textiles for the purpose of generating heat are enormous. Products may be developed that conform to complex contours providing a uniform heat distribution. Applications can be foreseen in the automotive sector; car seats, driving wheels and the interiors of door panel…
Shape memory alloy (SMA) wire actuators have been increasingly used in various devices and applications due to their high energy density and simple design. With the use of these actuators the questions of size effects on their behavior need to be addressed. This paper presents a study on the cyclic loading behavior of…
In order to investigate the multiplication of equiaxed grains by the forced convection, in-situ observation using a transparent organic substance have been made. The emission of some spherical particles from the columnar zone was observed by a fiber scope installed in an ingot case. These particles are originally the…
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…