Materials Literature
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Abstract The influence of structural recovery or physical aging on the craze initiation of amorphous polystyrene and a styrene‐acrylonitrile copolymer has been examined in two states of stress/deformation and at different temperatures. Studies of craze initiation in equibiaxial creep were performed using a “bubble” in…
Abstract The titled new salts were synthesized by exchanging the unknown counter anion of [Sb(pc)Cl2]+ salt (pc2− = phthalocyaninate, C32H16N82−), which was the first product of the reaction of phthalonitrile with antimony(III) trichloride, with perchlorate, tetrafluoroborate, and hexafluorophosphate. Elemental analyt…
Abstract There is a growing demand for rigid vinyl foam as a wood replacement in window frames, blinds, trimming and other applications. While rigid vinyl foam has existed for many years, additional understanding of its processability and required conditions for good quality extruded profile would be helpful. This pap…
In this paper we propose a fitting procedure to describe the bandpass effect on all x radiation that passes through a focusing graphite monochromator used on the diffracted beam. The proposed bandpass function is: M (2θ)=1/(1+ K mon 1 s K mon 2 ), with s =(2 sin θ)/λ, where K mon 1 and K mon 2 are constants which have…
Electrical resistance measurements and x-ray-diffraction experiments have been carried out under high pressure for \ensuremath{\alpha}-monoclinic and amorphous and trigonal Se. \ensuremath{\alpha}-monoclinic Se showed a transition to the metallic state at 12 GPa, which was considerably lower than 23 GPa of trigonal Se…
Expansion of a mesh skin graft depends on factors pertaining to the graft itself as well as on parameters of the meshing device. With regard to the graft, we examine the efficiency of graft handling and thickness of the skin graft. With regard to the parameters of the meshing apparatus, which determine the expansion r…
The intensity of Raman modes of four different silicate garnets in the energy range 1.9–2.7 eV was investigated. In the case of almandine (Fe3Al2Si3O12) and pyrope (Mg3Al2Si3O12) no change in intensities was observed in this energy region and in uvarovite (Ca3Cr2Si3O12) a weak resonance maximum was observed between 2.…
ArF excimer laser photolysis of gas phase tetramethyltin was used to deposit thin organotin films on Si. In situ Auger electron spectroscopy and x-ray photoelectron spectroscopy (XPS) film analysis, showed the presence of C and Sn, which, according to C 1s and Sn 3d5/2 peak deconvolution, were organized in highly bran…
Three existing multislice formulations (MS) that are claimed to be applicable for large beam tilt are introduced in a unified form and the validity of these formulations for large beam tilt is evaluated. It is shown that one formula, which is called MSSBT (the MS for small beam tilt), is valid only for tilt angles les…
This paper deals with the problem of carpet resilience which depends on pile yarn properties and carpet construction characteristics. Up to now, resilience could only be measured on the carpet itself. New methods are being developed to assess the resilience properties of pile yarns directly before carpet manufacturing…
This study compared the relative effectiveness of TLD crystals LiF:Mg,Ti (TLD-100) and LiF:Mg,Cu,P (TLD-700H) for clinical dosimetry, focusing on reproducibility, linearity, and energy response. Experimental results indicated that TLD-700H was superior to TLD-100 with regard to reproducibility, lack of supralinearity,…
Porous silicon samples were grown under various anodization conditions on {100} oriented n‐silicon substrates. Scanning and transmission electron microscope observations have shown that the microstructure of porous silicon primarily falls into three categories, which can be classified as single layer, double layer, an…
Summary The Ca concentration of the soil solution influences K plant nutrition by its influence on K concentration of the soil solution and on soil buffer power through ion exchange and K release or fixation. The effects of the imposed solution Ca concentration on the estimates of these parameters and on these two phe…
Pineapple-fibre-reinforced, low-density polyethylene (LDPE) composites were prepared by a solution mixing-technique. The dielectric constant, volume resistivity, and dielectric loss factor of the composites were evaluated as a function of frequency, fibre content, and fibre length. The dielectric constant values were…
Electrochemical oxidation of a dimercaptan, 2,5-dimercapto-1,3,4-thiadiazole (DMcT), to a polydisulfide (DMcT polymer) and electrochemical reduction of the polydisulfide at a carbon electrode and an indium−tin oxide electrode have been studied in 0.1 M LiClO 4 −acetonitrile by means of an in situ electrochemical quart…
4, 4′-diamino-2, 2′-diphenylbiphenyl (1), 4,4″-diamino-2′, 3′, 5′-triphenyl- p-terphenyl (2a) and 4,4″-diamino-2′, 3′, 5′, 6′-tetraphenyl- p-terphenyl (2b) have been polymerized with several aromatic dianhydrides in refluxing m-cresol containing isoquinoline to afford a series of phenylated polyimides. The polymerizat…
The structure of a 50-nm-thick TiO2 film grown on MgO(001) substrate maintained at 630 °C was studied by x-ray diffraction. Each film was fabricated by varying both the deposition rate of Ti atoms, which are produced by Ar-ion beam sputtering onto a Ti target, and the partial pressure of O2 gas (PO2). When Ti atoms ar…
The fadH gene coding for an NADPH-dependent 2.4-dienoyl-CoA reductase from Escherichia coli has been cloned by the polymerase chain reaction. This gene is located at 67.65 min on the E. coli chromosome. The complete open reading frame contains 2019 bp coding for the processed protein of 671 amino acid residues, with a…
Chitin has the ability to adsorb substantial quantities of dyestuff from aqueous solutions. The design procedures for batch kinetic study have been investigated for an acid dye, Lansayin brown grl. The effect of several factors governing the dye adsorption such as the adsorbent concentration, adsorbent size, temperatu…
Rust formed by corrosion on the inner surfaces of oil tanks may react with hydrogen sulfide gas in the vapor above crude oil. This reaction produces mixtures of iron sulfides which are pyrophoric, and they cause explosions when they are exposed to air during the unloading of the tankers. This paper shows that it is po…