Materials Literature
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Lipase-catalyzed ring-opening polymerizations of 4-substituted ε-caprolactones employing Novozym 435 as the biocatalyst demonstrate dramatic differences in polymerization rates and selectivity depending on the size of the substituent. Quantification of the reaction rates shows that the polymerization rate decreases by…
The shape demagnetizing factors of a planar magnetic insulator are of some interest in the design of a number of microwave ferrite components. One means of experimentally evaluating these quantities, in the case of a disk geometry, is to measure the Kittel line and to make use of a standard identity. Another method, i…
Unsaturated polyesters were synthesized in the laboratory by the condensation of maleic anhydride and phthalic anhydride with propylene glycol. The condensate obtained was mixed with styrene monomer to get an unsaturated polyester resin formulation. The properties of the polyester resin synthesized were found to be af…
There is a strong criticism against usage of buffered ammonium acetate as an extractant for the determination of exchangeable elements in acid soils dominated by low‐activity clays. There are several reports regarding the use and misuse of diethylene triamine penta acetic acid as a universal extractant for iron, manga…
Abstract In this work, we used HNO 3 /HF Vapour Etching (VE) of silicon (Si) wafers for the formation of different porous structures. Depending on the volume ratio of the HNO 3 /HF acid mixture, we can obtain Porous Silicon (PS) layers or a (NH 4 ) 2 SiF 6 like powder phase. These two kind of porous structures may be…
This study fabricated polyurethane foam after transforming the cell structure from a convex polyhedral shape to a concave shape. Polyurethane was synthesized and fabricated after changing the cellular structure of the foam using two methods. Scanning electron microscopy showed that the cellular structure was a more co…
Article Structure-Property Relationships in Polyoxymethylene/Thermoplastic Polyurethane Elastomer Blends was published on June 1, 2005 in the journal Journal of Polymer Engineering (volume 25, issue 4).
The effects of Ho (holmium) doping on the electrical properties and microstructural development of (Ba 1- x Ho x )TiO 3 were investigated by means of defect chemistry on the basis of equilibrium electrical conductivity data measured at 1300°C, as a function of oxygen activity. Ho 2 O 3 additions to BaTiO 3 up to 0.3 m…
This study evaluates the impact of certain finishing formulations, posttreatment with copper acetate as well as type of cotton fabric on the easy-care properties and UV protection of treated fabrics. The results detailed in this article indicate that (1) increasing the finishing agent concentration results in a signif…
A bacterial strain M4-7 capable of degrading various polyesters, such as poly(epsilon-caprolactone), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxyoctanoate), and poly(3-hydroxy-5-phenylvalerate), was isolated from a marine environment and identified as Pseudomonas alcaligenes. The relative molecular mas…
Qualitative analysis of the factors governing variation in T c and P s of PbTiO3, KNbO3 and BaTiO3 members of ABO3 perovskite family considering the parameters like tolerance factor, t, electronic configuration, electronegativity, polarizability and character of bonding using molecular orbital theory (MOT) reveals tha…
Due to a strong quantum confinement effect, the thermal conductivity and heat capacity per unit volume of a nanocrystalline silicon (nc-Si) layer prepared by electrochemical anodization are extremely lowered in comparison to those of single crystal silicon (c-Si). Based on this high contrast between the thermal proper…
Models for predicting ring yarn hairiness are built using backpropagation neural network algorithm and linear regression analysis. An original approach dealing with overfitting and allowing the selection of the optimal neural network architecture is used. It is based on the estimation of the leverages, i.e. the influe…
Ultrasonic three-dimensional (3-D) image sensing in air is successfully demonstrated by combining a novel thermally induced ultrasonic emission from nanocrystalline porous silicon (nc-PS) device with a condenser microphone array. The nc-PS ultrasonic emitter is composed of a patterned heater electrode, an nc-PS layer,…
Silicon nitride (Si3N4) has been researched intensively because of superior mechanical properties up to high temperature. The mechanical properties of Si3N4 are strongly related to microstructure. The microstructure control of silicon nitride is well known to be a key issue for tailoring the mechanical properties of s…
Abstract This paper presents a technique for fabricating high‐aspect‐ratio silicon dioxide pillars by electrochemical etching of n‐type silicon in hydrofluoric acid (HF) solutions. Basic process flow and etching conditions are described, which make it possible to obtain high‐aspect‐ratio pillar arrays with good unifor…
Evaluations of diesel fuel effects on combustion and exhaust emissions in single-cylinder direct-injection diesel engines led to the unexpected result that a Swedish ‘class 1’ fuel generated more particulate matter (PM) than a fuel denoted ‘improved’, even though ‘class 1’ fuel had much lower distillation temperatures…
: In drying of solids, the diffusion model based on Fick's second law is usually applied to interpret the moisture migration within the solid. Then the temperature dependence of the moisture diffusivity, generally described by an Arrhenius-type equation, is obtained through the drying kinetics. In this article, a noni…
Surface engineering plays an important role in aerospace and allied applications. Finishing for space applications, however, requires higher standards and better control than those used for ground applications, because an on-orbit spacecraft is not approachable for repair and space conditions are severe. Mass reductio…
The inhibition efficiency of an aqueous extract of garlic in controlling corrosion of aluminium immersed in sodium hydroxide solution at pH 11 and 12, in the absence and presence of Zn 2+ , was evaluated by the weight loss method. At pH 11, the extract accelerated corrosion of aluminium in the absence and presence of…