Controlled Low-Strength Materials Containing Mixtures of Coal Ash and New Pozzolanic Material
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Compact Spinning for Improved Quality of Ring - Spun Yarns
A new impulse in the field of ring spinning technology is offered by compact-condensed spinning. The article presents the comparison of two chosen spinning systems for the production of compact ring yarns. We have analysed and compared the physical, mechanical and morphological properties of conventional and compact y…
Solvent-Free and Selective Oxidation of Hydroxy Groups to their Corresponding Carbonyl Functions with Ferric Nitrate Activated by Heteropoly Acids
Keggin-type heteropoly acids revealed high catalytic activity for swift and selective oxidation of various hydroxy functionalities to the corresponding carbonyl groups using ferric nitrate as an oxidant under mild and solvent-free conditions. We have found that the catalytic activities of the heteropoly acids were muc…
A rapid stereocontrolled synthesis of the 3a-hydroxy-pyrrolo[2,3-b]indole skeleton, a building block for 10b-hydroxy-pyrazino[1′,2′:1,5]pyrrolo[2,3-b]indole-1,4-diones
A two-step selenocyclisation-oxidative deselenaton sequence was used to establish the 3a-hydroxy-pyrrolo[2,3-b]indole core; these tricycles were used as effective precursors to 10b-hydroxy-pyrazino[1',2':1,5]pyrrolo[2,3-b]indole-1,4-diones.
Electrolytic Properties and Nanostructural Features in the La[sub 2]O[sub 3]-CeO[sub 2] System
Doped ceria compounds are fluorite-type oxides which show oxide ionic conductivity higher than yttria-stabilized zirconia in oxidizing atmosphere. As a consequence of this, considerable interest has been shown in applications of these materials for low or intermediate temperature operation of solid-oxide fuel cells (S…
Genesis of Tephra‐derived Soils from the Roccamonfina Volcano, South Central Italy
The properties of seven pedons, formed in three different tephra deposits inside the main caldera of the Roccamonfina volcano, were examined to better understand the genesis of these soils. Three of these soils derived from trachytic ash deposits are deep and porous and have andic properties, imogolite, and high allop…
Piezoelectric and Dielectric Characteristics of Lithium Potassium Niobate Ceramic System
In this paper, xLi2O-yK2O-(1-x-y)Nb2O5, x = 0 − 1 and y = 0 − 1, system was partially studied using Lithium and Potassium Niobate as sintering materials in order to reduce the sintering temperature. The prepared lithium potassium niobate ceramics are characterized using X-ray diffraction method and grain size have bee…
Platinum Group Metals and their Oxides in Semiconductor Photosensitisation
The basic principles of semiconductor photochemistry, particularly using titania as a semiconductor photocatalyst, are discussed. When a platinum group metal or its oxide is deposited onto the surface of a sensitised semiconductor the overall efficiency of the reactions it takes part in are often improved, especially…
Role of Iron in Mullite Formation from Kaolins by Mössbauer Spectroscopy and Rietveld Refinement
This paper examines the role of iron in mullite nucleation and growth from kaolins. We chose two typical raw kaolins containing a reduced impurity level and characterized by very different degrees of crystallinity of the kaolinite phase. Both the structural iron in kaolinite and also some iron deposited onto phyllosil…
Structural and equivalent continuum properties of single-walled carbon nanotubes
Single-walled carbon nanotubes are treated as cylindrical structures of which their extensional, torsional, and bending rigidities are investigated. Using the potential energy for interatomic forces of the molecular mechanics model, pin-jointed truss models for single-walled carbon nanotubes were created. These truss…
Antireflective silica thin films with super water repellence via a solgel process
A solgel process was developed, through which silica films possessing both high antireflection and super water repellence were obtained. In this process, methyl-modified SiO2 sols synthesized by colloidal suspension of SiO2 particles and hexamethyldisilazane (HMDS) were used to deposit spinning-coating films on optica…
Reagent-free crosslinking of aqueous gelatin: manufacture and characteristics of gelatin gels irradiated with gamma-ray and electron beam
In order to obtain a gelatin hydrogel crosslinked by a reagent-free method, gamma-ray and electron beam radiation was applied to porcine, bovine and fish gelatin gels and the products were characterized by measuring the gel fraction, the swelling ratio and the enzymatic degradability. On increasing the radiation dose,…
Quantifying the Resistance to Airflow during Iron Ore Sintering
Sintering tests, involving airflow measurements before and after bed ignition, were carried out on three optimized iron ore blends-containing only hematite (HAEM), hematite with pisolite (PISO), and hematite with pisolite and hematite-goethite (PIMM)-to assess the resistance of the flame front and associated regions.…
Effect of process conditions on the weld‐line strength and microstructure of microcellular injection molded parts
Abstract This study was aimed at understanding how the process conditions affect the weld‐line strength and microstructure of injection molded microcellular parts. A design of experiments (DOE) was performed and polycarbonate tensile test specimens were produced for tensile tests and microscopic analysis. Injection mo…
Magnetic and neutron diffraction studies on double perovskites A2LnRuO6 (A = Sr, Ba; Ln = Tm, Yb)
Magnetic properties of double perovskites A2LnRuO6 (A = Sr, Ba; Ln = Tm, Yb) have been reported. Powder neutron diffraction measurements have been performed at 10 K and higher temperatures (≥100 K) to determine their crystal and magnetic structures. As a result of the Rietveld analysis of the diffraction profiles, it…
l-Lysine based gemini organogelators: their organogelation properties and thermally stable organogels
Novel gemini organogelators based on L-lysine, in which two L-lysine derivatives are linked by different alkylene chain lengths through the amide bond, have been simply and effectively synthesized, and their organogelation abilities and thermal stabilities have been investigated. In a series of L-lysine ethyl ester de…
A solid-state NMR study of the structure and molecular mobility of α-keratin
A solid-state NMR study of an α-keratin sourced from equine hoof has revealed a strong dependence of molecular conformation and molecular dynamics on the degree of hydration of the material. 13C cross-polarization, magic-angle spinning experiments were used in conjunction with two-dimensional 13C-1H WISE and 2H NMR to…
A New 1 MHz-9 GHz Thin-Film Permeameter Using a Side-Open TEM Cell and a Planar Shielded-Loop Coil
A new permeameter for both metallic and insulative thin-films is proposed for up to 9 GHz range. The film sample is driven by a traveling electromagnetic field and the output signal is sensed by a planar shielded-loop coil. The electric field induced voltage at the pickup coil can well be suppressed by the nature of t…
Gadolinium-binding helix–turn–helix peptides: DNA-dependent MRI contrast agents
A de novo designed gadolinium metallopeptide was found to be a very efficient relaxation agent, with 100% increase in relaxivity upon binding to DNA.
Electrochemical study on microbiology-related corrosion of metallic dental materials.
Microbiology-related corrosion has been noted in industry for many years. It is widely recognized that microorganisms affect the corrosion of metal and alloys immersed in aqueous environments. Under similar conditions, the effect of bacteria in the oral environment on the corrosion of dental metallic materials remains…