Materials Literature
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Aiming at developing a dental titanium alloy with better mechanical properties and machinability than unalloyed titanium, a series of Ti-Nb alloys with Nb concentrations up to 30% was made. They were cast into magnesia-based molds using a dental casting machine and the mechanical properties and grindability of the cas…
Two different strategies for the synthesis of t-selenium nanorods and nanowires are described, wherein the solution based method involves a reaction of selenium powder with NaBH4 while the other employs the thermal decomposition of [(CH3)4N]4Ge4Se10.
The effect that synthesis procedures have on the performance of (yttria-stabilized zirconia) anodes for solid oxide fuel cells (SOFC) has been investigated. Using a fixed concentration of 20 wt % Cu and 10 wt % impregnated into a porous YSZ matrix using metal salts, it is shown that the methods used to prepare and Cu…
A non-steroidal anti-inflammatory drug (ibuprofen) has been anchored inside the mesoporous channels of MCM-41-type silica and on a silica gel surface. The relevant anchoring procedure through an ester function has been investigated. It uses the epoxide ring opening of 3-glycidoxypropylsilane grafted on the silica surf…
In this paper, the Phase Change Random Access Memory (PRAM, also known as Ovonic Unified Memory-OUM) cell, which has an extremely small and reproducible contact area and improved thermal environment, was fabricated and electrically characterized. The memory cell successfully operates with 30 ns pulses of 0.20 mA for R…
We discuss the use of nitric oxide (NO) gas to dope ZnO p-type films, fabricated using metallorganic chemical vapor deposition (CVD) reaction of a Zn metallorganic precursor and NO gas. In this reaction, NO gas is used to supply both O and N to form a N-doped ZnO (ZnO:N) film. Auger electron spectroscopy analysis indi…
Some principles of current distribution within recesses that were developed last century by Carl Wagner are a basis for understanding crevice corrosion that occurs by the recently proposed (1985) so-called IR mechanism, where I is the ionic current flowing out of the crevice or pit, and R is the resistance of the crev…
The plasma display panel (PDP) as a medium of large format TV is gaining attention due to its high performance and scalability. The performance and life, or stability, of a PDP is strongly related to the nature of phosphors. Life and persistence are the main concerns in Mn-activated zinc silicate and barium-aluminate-…
Ce–Pr–O mixed oxides prepared by coprecipitation and calcined at 1173 K reveal a non stoichiometric structure with oxygen vacancies in the bulk. In situ XRD and Raman spectroscopy were used to investigate these properties simultaneously and identified a thermal expansion coefficient twice as high as that of pure ceria…
Protein kinases play key roles in signal transduction and therefore are among the most attractive targets for drug design. The pharmacological aptitude of protein kinase inhibitors is highlighted by the observation that various diseases with special reference to cancer are because of the abnormal expression/activity o…
An unusual trinuclear iron(III) cluster described herein, [Fe3(μ3-O)(μ2-CH3COO)6(C5H5NO)2(H2O)] ClO4·4H2O (1) (C5H5NO = 2-pyridone), features a cyclic hydrogen bonded supramolecular water tetramer at one of the iron centres, as characterized by X-ray crystallography and thermogravimetry. The water cluster is formed by…
The complexation of palladium(II) by a unique family of [2+2] diiminodipyrromethane macrocycles yields compounds that adopt structures reminiscent of Pac-Man porphyrins.
Organized mesoporous silica sub-micro spheres have been synthesized by spray drying solutions containing hydrated Si(OEt)4 as silica precursor and surfactants as texturing agent. The resulting powder exhibits controlled organized 2-D hexagonal honey-comb like porosity of 2.2 nm mean pore diameter, homogeneous size dis…
We report the observation of thermally driven mechanical vibrations of suspended doubly clamped carbon nanotubes, grown by chemical vapor deposition (CVD). Several experimental procedures are used to suspend carbon nanotubes. The vibration is observed as a blurring in images taken with a scanning electron microscope.…
Highly ordered three-dimensional Im3m-type periodic mesoporous organosilica with a cavity size of 9.8 nm has been synthesized under strongly acidic media in the presence of inorganic salts using triblock copolymer F127 as the template and 1,2-bis(trimethoxysilyl)ethane as the organically bridged silica source.
The electrochemical properties of single-wall carbon nanotube (CNT) electrodes in the form of sheets or papers have been examined. Thermal annealing has produced significant changes in a range of properties of the material including increased hydrophobicity and elimination of electroactive surface functional groups an…
A mathematical model is presented that incorporates the mass transport by diffusion in the porous structure of thick substrate type solid oxide fuel cells (SOFCs). On the basis of the mean transport pore model a multidimensional study allows for an optimization of the structural parameters of the substrates with respe…
We present an overview of the fifth round of Critical Assessment of Protein Structure Prediction (CASP5) fold recognition category. Prediction models were evaluated by using six different structural measures and four different alignment measures, and these scores were compared to those assigned manually over a diverse…
Three generations of bidentate phosphinated Pd(II) dendrimers are efficient catalysts in the absence of copper co-catalyst for the Sonogashira reaction and are, with two cyclohexyl substituents on the phosphorus atoms, recovered by precipitation and re-used.
The E-MSD macromolecular structure relational database (http://www.ebi.ac.uk/msd) is designed to be a single access point for protein and nucleic acid structures and related information. The database is derived from Protein Data Bank (PDB) entries. Relational database technologies are used in a comprehensive cleaning…