Materials Literature
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Rotational dynamic magnetostriction was measured as a function of rotating magnetic flux density on nonoriented and grain-oriented silicon steel sheets under various magnetization conditions. Rotational dynamic magnetostriction was measured by using a special strain gage which provides x- and y-direction output. Rotat…
Surface prickle of fabrics can be a factor limiting the use of the coarser types of wool in apparel or upholstery products. An investigation is reported in which, in order to find a method of measuring prickle, a selection of fabrics with a widely differing number and stiffness of protruding fibres was assessed for pr…
The both-faces-hindered and highly symmetric complexes 5,10,15,20-tetra(2′,6′-dipivaloyl-oxyphenyl)porphyrinato-iron(II) and -cobalt(II), which have no amide residues but ester ones in the fence groups, have been synthesized. The iron(II) complex formed stable and reversible dioxygen adducts in toluene at 25 °C. The h…
Amorphous magnetostrictive Co-Fe-Si-B wires exhibiting square and bistable hysteresis loops have been obtained by tension annealing treatments of the wires cold-drawn to lower than 0.05 mm in diameter from the as-quenched state (0.125 mm in diameter). Bistable switching characteristics were observed even in a 1-cm len…
Unicellular algae are autotrophic eukaryotes which contribute to overall primary production in any aquatic ecosystems.Furthermore, some of them are very usefull in the aquaculture of fish, shrimp and shellfish as primary live food.However, the pathogens for the unicellular algae are not well known.Although various alg…
The crystal structures of [PPh3Me]2[CuBr3], [PPh3Me]2[CuBr2]Br, and [PPh3Me]2[AgI3] have been determined by single-crystal X-ray diffraction methods at 295 K. The salt [PPh3Me]2[CuBr3] contains a planar, almost perfectly trigonal tribromocuprate (I) ion [CuBr3]2–. The exact symmetry of the ion in the crystal is C2v, w…
Recent experiments on colloidal suspensions of silica spheres in a water-lutidine mixture close to the consolute point have revealed interesting sphere-aggregation behavior that has been linked to wetting phenomena. We carry out a theoretical analysis of the phase behavior in such mixtures and suggest that the observe…
The butyrylation of chitosan of various degrees of acetylation yielded derivatives soluble in water and methanol. Solutions of the derivatives in these solvents when evaporated afforded tough clear flexible films. The effect of the degree of butyrylation on a range of deacetylated chitins was investigated and the resu…
Ethanolic extracts of forty Jordanian medicinal plants were examined for cytotoxicity, mutagenicity and antimicrobial activity. Among the 40 tested plants, 12 extracts were active in brine shrimp cytotoxicity bioassay with LC50 in the range of 74-748 μg/rnl. These positive extracts were further tested for their antitu…
The early stage of corrosion of copper by moist air containing 0.5% sulfur dioxide (75% relative humidity at 25°C) has been studied. Scanning electron microscopy, Auger electron spectroscopy, and transmission electron microscopy have been used to examine the surface topography, surface chemistry, and microstructure of…
The photoinduced phase transition behavior of liquid crystals (LCs) was investigated. The rate of the phase transition increased with increasing temperature and decreasing cell gap. The amount of isomerization of photoresponsive molecules to induce the phase transition was found to depend on the LC forming force and a…
The crystal structure of the low temperature modification of Na 3 PO 4 ( T < 601 K) has been determined and refined by means of Rietveld's full-profile technique using X-ray and neutron powder diffraction data. T-Na 3 PO 4 is tetragonal with space group P [unk]2 1 c . The cell dimensions are a = 1080.84(6) pm, and…
The electronic structure of some monomethyl derivatives of alloxazine has been investigated by the INDO/S-Cl-1 method in both the ground and in the two first-excited singlet states. A description of the intrinsic states of molecules by the extensive use of HOMO/LUMO coefficients is suggested. The proposed method both…
The room temperature mechanical properties of SiC fiber reinforced reaction-bonded silicon nitride matrix composite laminates (SiC/RBSN) have been measured. The laminates contained ∼30 vol% fraction of aligned 142-μm diameter SiC fiber in a porous RBSN matrix. Three types of laminates studied were unidirectional lamin…
Abstract A series of polyurethane elastomers were studied in which the soft segment composition was a molecular weight advanced poly(ethylene ether carbonate)diol (2025 mol wt) and the hard segment composition was based on MDI/1,4‐butanediol. These polyurethane elastomers had a constant soft segment composition and bl…
Polysilazane‐derived ceramic coatings in the form of thin films (0.1 to 4 μm) — fabricated by dipcoating soda‐lime rods with preceramic polymer solutions, followed by pyrolysis — increased the strength of the glass rods. Strengths up to 414 ± 57 MPa were obtained, 2.3 and 3.3 times higher than the strengths of uncoate…
La or Ce 3 d - and 4 d -core photoemission spectra are discussed for La and Ce compounds on the basis of the impurity Anderson model taking into account the atomic multiplets due to electron-electron interaction. A consistent explanation of 3 d and 4 d XPS of La and Ce compounds is presented. We also give an interpret…
ESR and optical absorption spectra have been recorded for a frozen dimethylformamide (DMF) solution of the complex FeIIIOEP(-OH)(-OOH)(OEP = octaethylporphyrinato) prepared by mixing FeIIOEP(pyridine)–O2 with ascorbic acid sodium salt.
22% Cr-3% Mo duplex stainless steels in which Ni and N contents were varied independently were prepared and base metal and TIG weld metal were subjected to pitting corrosion tests in 6% FeCl3. The critical pitting temperature at which pitting corrosion occurred was evaluated and the pitting site was observed. The pitt…
Abstract Experimental data for the dependence of the specific volume on temperature and pressure (PVT data) of a polydimethylsiloxane fluid with 100 cS viscosity are presented. The temperature range covered is 30–344°C and the pressure range is 0–200 MPa (0–29,000 psi). Coefficients for an empirical equation of state…