Materials Literature
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Arterial growth during embryonic vascular development is associated with longitudinal strain. The longitudinal strain is an important element of the embryonic vascular mechanical environment (EVME). Thus, a perfusion bioreactor for vascular tissue engineered constructs must include the functional capacity for longitud…
We have reported to make nanostructured cobalt oxide electrode that have large capacitance over than 400 F/g (specific capacitance) and good cycleability. But, it had serious demerits of low voltage range under 0.5 V and low power density. Therefore, we need to increase voltage range of cobalt oxide electrode. We repo…
Abstract Fatigue crack growth in 2024-T3 has been studied in ambient air and in vacuum at load ratios R = –1, R = 0.05 and R = 0.5 using ultrasonic equipment (cycling frequency 20 kHz) and servo-hydraulic equipment (20 Hz). In vacuum, no strain rate influences were found and similar growth rates and threshold stress i…
This paper is mainly devoted to the presentation and the illustration of chemical microananalysis methods. Four basic techniques will be successively presented: the energy dispersive X-rays spectroscopy (EDS), the wave dispersive spectroscopy of X-rays (WDS), the electron energy loss spectroscopy (EELS) and the Auger…
Ellipsometry has sufficient sensitivity for sensor applications and is here used as an optical readout method in a gas sensing system. Porous silicon is used as sensing layers in which vapors of solvents can adsorb and condensate due to capillary effects. A miniaturized multi-beam ellipsometer system is proposed and t…
The motion of a screw dislocation under the action of ultrasound is simulated with account taken of its cross slip in a spatially nonuniform stress field created by a fixed dislocation of the same sense. Only dislocations started from certain regions in the space are shown to undergo cross slip. The variations in the…
A field survey was carried out to determine the soil and leaf sulfur (S) status in some tea estates where urea based fertilizer mixtures had been used continuously for more than ten years. Fourteen tea estates in Ratnapura, Passara, Kottawa, and Deniyaya regions were selected for this study. Five extractants were used…
The goal of the present experiments was to obtain crack healing of hydrogen attack (HA) in low-carbon steel by heat treatment. It was observed by scanning electron microscopy (SEM) that HA cracks experienced different healing effects. The results indicated that HA cracks ≤ 10 μm in length can be healed completely by c…
Abstract The structural evolution in NiTi shape memory alloys subjected to pseudoelastic cycling is examined in the present study. Single crystals with [100] and [111] orientations were subjected to repeated compressive cycles and then studied by transmission electron microscopy (TEM). TEM observations were made at cy…
Motivated by experimental observations made on soft-PZT/alumina cantilever bimorphs, a nonlinear electromechanical model is presented describing the characteristic phenomena of ferroelectricity: the dielectric hysteresis, the butterfly loop, and the ferroelastic hysteresis. This model uses a phenomenological formulati…
A new experimental set-up has been developed which uses the environment of near field optical microscopy to locally induce photo-electrochemical reactions at a semiconductor surface in contact with an electrolyte. When the semiconductor is under reverse bias, illumination of the surface by the optical tip of the micro…
Abstract Blends of elastomers are often used as a basis for compound formulations. For instance, tire tread formulations may contain NR, BR and SBR in order to provide cost-effective products with good mechanical properties, dynamic properties and abrasion resistance. Blends of dissimilar EPDM grades are often used wh…
It has been stated that reliable qualitative identification of isocyanurate rings directly in urethane-isocyanurate elastomers (EUI) can not be realized using ATR method. Such identification becomes possible only on the basis of the analysis of EUI hydrolysis in acid medium products. It was done using following method…
Structural characteristics of non-stoichiometric copper selenides were studied by the elastic neutron and X-ray scattering techniques. Rietveld analysis was used to refine the structure of the high-temperature β-phase of the Cu 1.75 Se, Cu 1.78 Se, and Cu 1.83 Se samples. The homogeneity ranges of the cubic phase were…
A thermal treatment at 900°C (under nitrogen) of a milled mixture MnO-Fe 2 O 3 yields MnFe 2 O 4 mainly as the product of the reaction between Mn 3 O 4 (produced by ball milling) and Fe 2 O 3 . Under the same experimental conditions but starting from an unmilled MnO- Fe 2 O 3 mixture, the formation of MnFe 2 O 4 is on…
Flurbiprofen is an analgesic and antiinflammatory drug with poor water solubility and compressibility. Flurbiprofen conventional drug crystals were converted into spherical crystal agglomerates via the spherical crystallization technique using acetone-water-hexane solvent system. The various parameters optimized were…
Preliminary measurements of the thermal conductivity of pure carbon dioxide in the temperature range 1.5–35 K are reported. The first data below 25 K have been obtained. The thermal conductivity reaches very high values, about 700 W/(m⋅K), which is unusual for simple molecular crystals. A straightforward analysis of t…
Surface incorporation of a liming agent in combination with compost or biosolids is a proven way to revegetate acidic minespoils, but little is known about the effect of the surface amendments on subsoil chemistry. We conducted a greenhouse column experiment to investigate how different surface amendments affected pla…
The magnetic and transport properties of La 1− x Mn 1+ x O 3 manganites with excess manganese are studied. It is shown that magnetic and charge ordering heavily depends on the superstoichiometric manganese content, magnetic field, and pressure. The magnetoresistive effect (MRE) is enhanced as the manganese concentrati…
The Organization for Economic Cooperation and Development (OECD) Main Steam Line Break (MSLB) Benchmark was defined to validate the thermal-hydraulic system codes coupled with three-dimensional (3-D) neutron kinetic codes. The reference problem is an MSLB in a pressurized water reactor at end of cycle. The analyses we…