Materials Literature
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A new crystalline form (Form II) of glimepiride was prepared by recrystallization from an ethanol/water system. It was characterized by use of powder X-ray diffraction and infrared spectroscopy. Furthermore, the crystal structure was solved by X-ray crystallographic analysis. When compared with the molecular structure…
This paper aims to clarify some important aspects about the design of a Split Hopkinson Pressure Bar (SHPB) apparatus. This machine is used to obtain the stress-strain relations at different high strain rates. The already well-established theory of the SHPB is presented and the major variables for the design of a SHPB…
Crystals of anilinium perchlorate, C6H5NH ClO 3 4 + −, were obtained by slow evaporation of an aqueous solution at room temperature. Powder Kurtz-Perry measurements were performed for the title material. The efficiency of second harmonic generation was estimated relative to KDP: d = 0.21dKDP. Room temperature powder i…
The mechanical properties of parent material and welded joints of abrasion-resistant HARDOX steel has been discussed in the paper. The results of mechanical properties and technological bending tests have been presented. The possibility of predicting the mechanical properties of HARDOX steel on the base of regression…
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This is the second of a two volume series of books about fluoroplastics. Volume 1 covers the non-melt processible homopolymers, requiring non-traditional processing techniques. Volume 2 is devoted to the melt-processible fluoropolymers, their polymerization and fabrication techniques including injection molding, wire,…
Since the dose conversion factor (hereafter called DCF) due to radon progeny inhalation is strongly dominated by aerosol characteristics in the environment, it is important to understand the air quality for accurate dose assessment. Thus temporal variations on aerosol concentration, its particle size and its related a…
In the present study, the phase diagrams for zirconium-oxygen-hydrogen ternary system were assessed between 573.15K and 1, 473.15K by means of CALPHAD technique. The calculated ternary isothermal section of zirconiumoxygen-hydrogen system at 973.15K was in good agreement with the experimental diagram. The calculated a…
With increasing energy demands, dwindling fossil energy resources, and\nenvironmental concerns associated with criteria pollutants and greenhouse gases,\nsignifi cant attention in the gas turbine community has been focused on increasing\neffi ciency and reducing emissions. A highly effi cient and low emitting concept…
Six new phases with formula earth elements Y, Eu, Tb, Dy, Ho and Er) were prepared and they have iso-structure with orthorhombic The unit cell parameters were refined for all new phases. The ionic radii for 7-coordinated and were obtained by regression analyses, the values of which are 0.1188(2) and 0.1098(1) nm, resp…
Phenol was chemically attached to low molecular weight chlorinated polyisobutylene and stearic acid respectively. These phenolic antioxidants were characterised by IR, 1 H NMR and TGA. The efficiency and permanence of these bound antioxidants were compared with conventional antioxidants in natural rubber vulcanisates.…
The beneficial effects humidity treatments have on molecularly templated mesoporous silica films with respect to elastic modulus, with minimal detrimental effects on porosity and dielectric constant, were identified.
The oxidation of the bis-dioxolene 3,3,3′,3′-tetramethyl-5,6,5′,6′-tetrahydroxy-1,1′-spiro-bis(indane) (CatH2–CatH2) in acidic solution yields the o-quinone-catecholate (Q–CatH2) as a product. The mixed valence character of the molecule is removed on deprotonation yielding the paramagnetic bis-semiquinonato species du…
Details of the microstructure were investigated in Fe5Si3-particles-dispersed Si3N4 ceramics, synthesized by reaction during sintering. The following results were obtained: 1) the size of most part of Fe5Si3 particles was around 2 μm, and those particles had plate-like and roundish form, 2) a linear crack was observed…
Aluminum nitride (AlN) is usually sintered using yttria (Y2O3) as an additive where it reacts with the surface species to form a Y-Al-O-N liquid that promotes particle rearrangement and densification. Construction of the phase relations in this multicomponent system is important for the development of this ceramic. Th…
The wood and leaf samples of eight species are examined by non-isothermal means to determine the mass loss kinetics of the thermal decomposition with linear temperature programming in air atmosphere. A simple kinetic description is developed based on the experimental results and integral analysis method. In the model,…
Melt viscosity of a polypropylene (PP) resin was measured in a capillary rheometer between 220 and 260°C. The melt viscosity showed a power law behavior with strong shear rate dependence. The effects of temperature and shear rate on the degradation were studied in the rheometer by heating at 260 and 280°C, and extrudi…
Ultrasonic waves were used to perform suspension polymerization of styrene monomer in the absence of both emulsifier (surfactant) and polymerization initiator. Styrene monomer was ultrasonically dispersed as oil droplets at 40 kHz after being added dropwise into water. Polymerization of the monomer in the droplets was…
We report a systematic investigation on in situ reduction kinetics of silica in carbon based materials for refractories as a function of system parameters. The objective of this fundamental study was to establish factors influencing gasification of refractories, which in turn could lead to carbon depletion and refract…
A new method for surface modification based on the arc surface alloying has been proposed and its feasibility has been investigated performing niobium aluminide coating on a niobium base metal. When tungsten arc was used to melt an aluminum plate placed on a niobium block, the niobium surface was also melted and a mel…