Materials Literature
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The original crystalline structure of clay minerals can be altered in a controlled way, through acid or thermal treatments, resulting then in suitable products to be used as catalysts. This paper aims to characterize the red smectite clays of Boa-Vista, Paraíba (Brazil) in their natural form, and after chemical, therm…
Abstract We observed local enhancement of coherent anti‐Stokes Raman scattering (CARS) by isolated gold nanoparticles. CARS signals from adenine molecules of a DNA base attached to isolated gold nanoparticles were strongly enhanced owing to the electromagnetic enhancement at the local proximity of the particles. The l…
The possibilities of using stem cells in place of tissue-specific cells. This article focuses on tissue engineering therapies and presents the potential use of autologous stem cells in place of allogeneic or xenogeneic tissue-specific cells, with an emphasis on adult mesenchymal stem cells. Scaffolds, synthetic extrac…
A well defined, congruently melting stoichiometric system , KSb 5 S 8 (see Figure), with a wide optical energy gap that undergoes rapid reversible crystal–glass transformation is described. The activation energy of crystallization E c was calculated to be ∼ 167 kJ mol –1 . The kinetic parameters and energy bandgaps of…
Silicate glasses kept at ambient temperature densify spontaneously, and their properties change with time. This is known as ageing of a glass. The spontaneous change occurs according to first-order rate kinetics, with a characteristic (relaxation) time much shorter than that of the α-relaxation process. According to t…
A conference entitled ‘Proteolysis in Prokaryotes: Protein Quality Control and Regulatory Principles’ was organized by Regine Hengge and Bernd Bukau from 25–27 October, 2002 in Schwetzingen, a small southern German town with a reputation for its castle and asparagus. It was the first conference sponsored by the Deutsc…
Electrically switchable diffraction gratings can be formed in the self‐assembled cholesteric liquid crystal gels prepared using an azobenzene‐containing gelator. The grating formation (see Figure) results from a light‐induced reorganization process in these materials, which leads to the removal of the nanometer‐sized…
A mixed-potential model is described to predict the corrosion behavior of used nuclear fuel inside a steel-lined failed Canadian nuclear waste container under anticipated waste vault (repository) conditions. The model accounts for the effects of the alpha radiolysis of water, the precipitation of corrosion products on…
To study magnetic refrigeration an experimental device is developed. It uses gadolinium as a giant magnetocaloric effect material and a Halbach magnet cylinder as the magnetization source. A specific thermodynamic cycle, active magnetic regenerative refrigeration, is required to enhance the temperature span. The syste…
Abstract The O ‐phospho‐ L ‐serine [Ser(P)] containing peptides and proteins play an important role in controlling the morphology of biominerals. The poly[Ser(P)] and copoly[Ser(P) x Asp y ] affect the calcium carbonate (CaCO 3 ) morphology and polymorph. The CaCO 3 helical structures were obtained in the presence of…
Impact tensile and compressive properties of three different wrought magnesium alloys (AZ31B-F, AZ61A-F and ZK60A-T5) are determined using two different versions of the split Hopkinson bar. Tension and compression specimens are machined from extruded bars parallel to the extrusion axis. Tensile and compressive stress-…
The primary functions of the blanket in a deuterium/tritium-fueled fusion reactor are to convert neutron kinetic energy into heat, breed tritium for the fuel cycle and accommodate a heat transfer system. Various blanket concepts have been considered including those incorporating liquid metals, molten salts, water and…
Lightweight structural armor designs consist of multiple layers of ceramic, composite materials, metallic foams and other materials. Under ballistic impacts, the propagation of stress waves through the thickness is of interest to designers. It is recognized that events occurring during the early stages of the impact d…
This paper presents the magnetic equivalent circuit of a permanent magnet hysteresis synchronous motor (PMHS). The hybrid synchronous motor consists of 36% cobalt steel hysteresis alloys with neodymium iron boron permanent magnets to improve the overall performances of such a motor. Based on the magnetic equivalent ci…
Nanostructured spinel NiZnCu ferrites were prepared by the sol-gel method from metal nitrate raw materials. Analyses by X-ray diffraction and scanning electron microscopy showed the average particle size of NiZnCu ferrite was under 50 nm. The single phase of NiZnCu ferrites was obtained by firing at 250/spl deg/C, res…
In hexaferrites of the composition SrFe/sub 12/O/sub 19/ (SrM), Sr was substituted by R = La, Sm, and Nd. The precursors were weighed according to different Sm/sup 3+//Sr/sup 2+/ ratios (n = Sm/sup 3+//Sr/sup 2+/), where n was varied between 1/16 and 1/2. The samples were produced by hydrothermal synthesis. The effect…
An attempt is made to identify the acoustical characteristics of textile materials using precision woven monofilament fabrics as model textiles. The experiments try to eliminate the effect of entrapped air pockets in the fabric on an ultrasound wave field. The results of the experiment reveal that the power consumptio…
The objective of this work is to describe the dynamic thermal behaviour of thermoelectric generators and refrigerators. In practical situations, these devices work under transient operating conditions due to the time change in the imposed current, voltage, and hot or cold temperatures. Results for transient temperatur…
A review of coordination compounds of several metals (Co2+, Ru2+, Zn2+, Al3+, Y3+, Ln3+ = La, Gd, Yb, Lu) with tetra-crown-substituted phthalocyanine H2R4Pc (R4Pc2− = [4,5,4′,5′,4′′,5′′,4′′′,5′′′-tetrakis(1,4,7,10,13-pentaoxotridecamethylen)phthalocyaninate-ion]) has been presented. The syntheses of compounds with a g…
T he bac teri a- resi st propcrti es of vario us natura l medicinal products. like e lovc o il. neem o il , tul si oi l and karanj a oil, havc been studi ed. Among th ese prod uc ts, the c love and neem o il s s how good a nti -bactcri a l property ; c love o il shows cxccll ent anti-bac terial property o n COllon fab…