Materials Literature
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INTRODUCTION In the past remarkable research work was performed to investigate the fouling process for systems with one single salt, mainly the so called hard salts calcium sulphate and calcium carbonate. But in practice salt solutions consist mostly of more than one single component. Up to now only few studies invest…
oly-β-hydroxybutyrate (PHB) is a biodegradable polymer which is regarded as a new environmentally compatible material. A wide variety of micro-organisms accumulate poly-β-hydroxybutyrate within cells as an intracellular storage material of carbon and energy. In this study, PHB was synthesized by Ralstonia eutropha (fo…
The critical behaviour of a binary polymer blend of polyethylene glycol 600 (PEG600) and polypropylene glycol 1000 (PPG1000) was investigated by static and dynamic light scattering. The measurements were carried out in the homogeneous one-phase region (above the critical temperature Tc) and in the two-phase region in…
The catalytic polycondensation of the lamellar organized α,ω-organo-bis-silanetriols, 4,4′-bis(trihydroxysilyl)stilbene 1H and 4,4′-bis(trihydroxysilyl)diphenylbut-1,3-diyne 2H is described. The resulting polysilsesquioxane materials X1H and X2H were compared with those obtained by sol–gel route (X1M and X2M) from the…
High-temperature thermoluminescence (TL) measurements from CaF2 : Er(0.1%) and CaF2 : Ce for different Ce concentrations are reported. Additionally, Ce- and Er-doped samples at the optimum dopant level (0.1%) are variously codoped with La, Gd, Tl, Bi or Cs through a chemical diffusion process. The presence of another…
During the manufacture of specialty yams by blending dyed cotton and raw cotton, fibers damaged by the dyeing process degrade the physical properties of the specialty yams. For a raw cotton blended with a large amount of dyed cotton, the spinnability of the specialty yarn worsens due to the disparity of the raw materi…
As part of joint U.S.–Korean International Nuclear Engineering Research Initiative (INERI) investigating methods to enhance external cooling of advanced reactor vessel under severe accident conditions, a scaling analysis has been performed to study the phenomena of external cooling of an advanced reactor vessel under…
Refraction contrast X-ray imaging experiments were conducted on acrylic resin with an artificial cylindrical hole, A7075 aluminum alloy, A6063 aluminum castings, mild steel with cracks or voids, and low alloy steel with inclusions, using a ultra-bright synchrotron radiation X-ray beam in BL24XU hutch C of SPring-8. Co…
Laboratory- and rotating- frame spin-lattice relaxation times (T(1) and T(1rho)) of (1)H and (13)C in lyophilized poly(vinylpyrrolidone) (PVP) and methylcellulose (MC) are determined to examine feasibility of using T(1) and T(1rho) as a measure of molecular motions on large time scales related to the storage stability…
Crystallized polycrystalline barium strontium titanate (Ba0.5Sr0.5TiO3) thin films have been synthesized on the titanium metal substrates by an environmentally conscious method of hydrothermal synthesis. The films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), X-ray photoelectron spectro…
The semiconductor grade organosilicon gas trimethylsilane (Dow Corning Z3MS) can be used to deposit unique amorphous hydrogenated silicon carbide (α-SiC:H)-based alloy films that exhibit desirable properties such as chemical resistance, low stress, low permittivity, and low leakage. These film characteristics are idea…
Two-dimensional (2D) mesoporous silica films were employed as a template to fabricate ultrahigh-density ordered arrays of metallic nickel nanowires via electroless deposition.
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…