Materials Literature
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SUMMARIES The results of the paper conservation treatment using Ca(OH) 2 /methyl cellulose solutions prepared by two different methods were estimated by measuring chemical, mechanical and optical properties of treated and untreated papers. The permanence of papers treated was tested by accelerated ageing. The results…
A new method for determining effective thermal conductivity and Young’s modulus in thermal interface materials is demonstrated. The method denoted as the Bulk Resistance Method (BRM) uses empircal thermal resistance data and analytical modeling to accurately predict thermophysical properties that account for insitu ch…
Accurate thermal conductivity measurements were made on pure water and H 2 O + SrBr 2 solutions at pressures up to 100 MPa over the temperature range 293-473 K with a parallel-plate apparatus. The concentrations studied were between 2.5 and 20 mass%. The estimated accuracy of the method is about 1.6%. The pressure, te…
Oxidation behavior of Al4SiC4-SiC sintered bodies, which were synthesized by using Al, Si and C powders, was investigated under a constant temperature and changing temperature. A protective layer of Al4SiC4-SiC sintered bodies, which formed at the beginning of heating in air, inhibited oxidation. Since this protective…
The rigid cell wall of Chlorella vulgaris (Trebouxiophyceae) is probably composed of chitin-like substance. Chitinase isolated from Streptomyces griseus is able to split covalent linkages on isolated microfibrils. On cross-sections of plastic embedded cell walls the covalent linkages are masked by the layer of amorpho…
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…