Materials Literature
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A total number of 15 premoulded joints of three 170 kV cable circuits (XLPE and EPR) were equipped with partial discharge (PD) sensors. The developed sensors are based on inductive high frequency coupling of partial discharge pulses occurring in the joints. The PD activity of each joint was monitored during an after l…
Ultradisperse-diamond clusters are shown to be fractal objects, and the character of variation of the fractal dimension in the course of the diamond-graphite phase transition under annealing in an inert atmosphere is studied.
Thermal reactions of magnesium compounds and kaolinite were investigated to obtain dense cordierite ceramics without additives. Magnesium hydroxide was precipitated from aqueous solution in the form of ultrafine hexagonal tabular particles of about 0.1 µm, and heating this mixture with kaolinite in a mole ratio of MgO…
The working zone of a sea urchin tooth is a ceramic‐fiber‐reinforced ceramic‐matrix composite. It is composed of reinforcing calcitic fibers, a matrix of high‐magnesium‐containing calcite crystals, and organic material. It is much harder and tougher than most other calcitic materials. Fracture toughness and microhardn…
Abstract Bacterial polyhydroxyalkanoates (PHAs) are polyesters of 3‐hydroxyacids produced as intracellular granules by a large variety of bacteria, currently receiving much attention because of their potential as renewable and biodegradable plastics. The monomer units in these microbial polyesters are all in the R ‐co…
The past decade has been characterized by rapid progress in Monte Carlo simulations of protein folding in a solution. This review summarizes the main results obtained in the field, as a background to the major topic, namely corresponding advances in simulations of protein adsorption kinetics at solid–liquid interfaces…
AgI clusters in zeolite-Y (AgI/Y) were prepared by Ag+ exchange followed by reaction with NaI in solution. The formation of the clusters was determined by transmission electron microscopy and Auger electron spectroscopy. The clusters were uniform and even in size, 1.0–2.0 nm. The fluorescence spectrum of the clusters…
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The thermal conductivity κ and thermal diffusivity α of high-strength polyethylene fibers, Dyneema TM , with various draw ratios were measured from 10 K to 260 K. κ and α increased with increasing draw ratio and α was nearly proportional to the square root of the tensile modulus E of the fiber. The estimated phonon me…
In order to investigate the thermodynamic behavior of t' , t* , and κ phases with the composition, , the equilibrium oxygen partial pressure, p O 2 , over their mixtures with pyrochlore was measured utilizing an electrochemical cell: . The conclusions described below were derived: the thermodynamic stability of the κ…
The wetting behaviour of carbohydrate surfactants bearing siloxane, carbosilane, polysilane or silane moieties has been investigated. By static surface tension (γlv, σ) and wetting tension (γsv−γsl, α) measurements on a non-polar perfluorinated surface (FEP®), the contact angles of aqueous surfactant solutions above t…
The crystal growth of trans -azobenzene (diamagnetism) has been investigated in a magnetic field of 80 kOe. The crystallographic axes are determined by X-ray diffraction and compared with the magnetic axes. The crystals grow so that the magnetic χ 3 axis is parallel to the direction of the field. The orientation is ex…
Thermo- and photo-stimulated luminescence are studied for CsI—Tl crystal after the irradiation with the UV light at 80 K. Creation spectrum of the photostimulated luminescence coincides with the D absorption band of Tl+ ions. Nature of the defects created by UV light at low temperatures is discussed basing on the corr…
Accumulation of collagen produces organ dysfunction in many pathological conditions. We measured the fractional synthesis rate (FSR) of dermal collagen in five human volunteers from the increment of [13C]proline in detergent-soluble dermal collagen hydroxylated to hydroxyproline during a continuous infusion of L-[1-13…
We demonstrate that thin films of thermotropic smectic liquid crystals can be inflated by external pressure to form bubbles similar to lyotropic soap bubbles. These bubbles can be generated with film thickness of a few molecular layers and radii of several centimeters; they are perfectly suited for studies of static a…
K6Sn23Bi2 wurde aus den Elementen in einer verschweißten Niobampulle bei 620 °C hergestellt. Ein Einkristall der Zusammensetzung K6Sn25 konnte durch Umsetzung einer erstarrten Schmelze der nominellen Zusammensetzung „K4Sn9”︁ mit 18Krone6 (1,4,7,10,13,16-Hexaoxacyclooctadecan) bei 45 °C isoliert werden. K6Sn23Bi2 und K…
We present the results of a systematic ac calorimetric study on the smectic-$A$ to nematic ($\mathrm{Sm}\ensuremath{-}A--N$) phase transition for the alkylcyanobiphenyl liquid crystals, 8CB and 9CB, imbedded in the randomly interconnected voids of Millipore cellulose membranes. The confining void size ranged from 5 to…
The stress of Pt films deposited at various temperatures and its correlation with the formation of hillocks during heat treatment were investigated. The residual stress changes from compressive to tensile as the deposition temperature increases. The compressive residual stress of a Pt film deposited at room temperatur…
Nonlinear transient heat conduction in a finite slab with potential-exponential temperature-dependent specific heat and thermal conductivity is investigated numerically by using the network method. A general network model for this process is proposed, whatever the exponent of the temperature-dependent functions may be…
Crystallization mechanism of Ge 2 Sb 2 Te 5 thin films sandwiched between SiN layers was optically investigated and double transition temperatures were observed in the case of Ge 2 Sb 2 Te 5 film thickness of more than 20 nm. The activation energies were estimated by both Kissinger's and Johnson-Mehl-Avrami equations,…