Materials Literature
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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…
Abstract Graft copolymerization of styrene (St) onto poly(3‐hydroxybutyrate) (PHB) and poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) (P(HB‐HV)) was carried out using simultaneous irradiation and pre‐irradiation techniques with 60 Co γ‐rays. The degree of grafting (X g ) of styrene onto PHB increased with increasing pre…
The spreading parameter S is the fundamental parameter controlling the stability of thin liquid films intercalated between a hydrophobic solid and a soft elastomer (Young modulus E ): S = γ SR − (γ SL + γ LR ), where γ SR, γ SL, and γ LR are respectively the solid/elastomer, solid/liquid, and liquid/elastomer interfac…
The expression for the interaction force exerted by a sound field between two gas bubbles, allowing for the compressibility of the surrounding liquid, is derived. The bubble radii are considered to be small compared to the distance l between the equilibrium centers of the bubbles and the wavelength λ of sound, while t…
The narGHJI operon encodes the three subunits, alpha, beta, and gamma, of the respiratory nitrate reductase complex in Escherichia coli. A fourth open reading frame of the operon encodes a putative protein, NarJ, which is not present in purified nitrate reductase, but is required for biogenesis of the membrane-bound c…
The first stable molecular Fev complex, [Fev(I)(′N2S2′)], forms in the metal-centered oxidation of the readily accessible FeIV complex [FeIV(pnPr3)(′N2S2′)] with elemental iodine according to Equation (a). The high-valent character of the iron center is proved by structural, spectroscopic, and electrochemical data.
Abstract The synthesis of appropriate porphyrin‐quinone electron‐transfer complexes as model compounds for photosynthesis requires access to functionalized triptycene quinone aldehydes with different redox potentials. A synthetic strategy involving a classical Diels‐Alder reaction, tautomerization and oxidation was on…
The ability to resist adhesion of proteins, bacteria, cells and tissue is an important requirement for the surfaces of medical devices. This article describes a surface-modification process that imparts anti-adhesive properties to the surfaces of biomedical materials through the covalent binding of hyaluronan. It can…
The change in local atomic configurations during electron irradiation was studied by the analysis of the extended energy-loss fine structure of a highly oriented pyrolytic graphite crystal. The spectral change obtained was interpreted in terms of the local distortion of the basal planes and the formation of alternativ…
The localized concentration of energy during a single bubble collapse is manifested in two forms, which are the emission of an acoustic pulse, and the emission of a light pulse. Through precise control of experimental parameters, one can levitate a single bubble in a standing wave field and measure the magnitude of th…
A wealth of literature in research at molecular levels concern ing the transition metals, e.g., Cu- and Mo-containing compounds, has been intensively documented for flame retardance, particularly smoke suppres sion, of PVC. An attempt has been made in this article aimed at performing a cone calorimetric analysis in ai…