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A self-tuned magnetostrictive/piezoelectric hybrid Tonpilz transducer which produces enhanced motion at one end and canceled motion at the other is presented. The particular hybrid Tonpilz transducer described here consists of two 5.4 in. (13.65 cm) diameter circular pistons with a central mass separating a Terfenol-D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive coordination of stilbazoles to metalloporphyrinsYuki Iseki, Eishun Watanabe, Atsunori Mori, and Shohei InoueCite this: J. Am. Chem. Soc. 1993, 115, 16, 7313–7317Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published ini…
Abstract In concentrated alkaline sodium silicate solutions a consistent decrease in the amount of silicate monomer Q 0 , end‐groups Q 1 , cyclic trimer Q groups and middle groups Q 2 , and also branching groups in ring formations Q , is observed with increasing molar ratio of SiO 2 to Na 2 O ( R M), whereas for branc…
A review is given on the determination of the thermodynamic properties of Si(OC2H5)4 (TEOS, tetraethoxysilane). In addition, the thermal decomposition of TEOS has been studied by in-situ IR spectroscopy. The decomposition products in the gas phase in the absence of oxygen are organic fragments (ethanol, ethanal, ethen…
Porphyrins are the molecules which are at the heart of most biochemical reactions involved in bioremediation. This review paper discusses the chemical structures, the biosynthetic pathways and the occurrence of porphyrins in the environment. The parallel between the mammalian and bacterial cytochrome P-450 enzyme syst…
Abstract The “Formation Rouge” from the Jbel Rhassoul in Morocco is composed of detrital sediments which have a lacustrine origin. The clays contained in the less than 2 µm fraction of the sediments are detrital phengites and illites, illite/smectites or smectites, and palygorskite. Due to the presence of well preserv…
We have investigated the different contributions to the entropy change at the martensitic transition of different families of Cu-based shape-memory alloys. The total entropy change has been obtained through calorimetric measurements. By measuring the evolution of the magnetic susceptibility with temperature, the entro…
Abstract On the basis of a large amount of research on the fracture behaviour of ceramics, a new failure criterion is advanced. It is pointed out that the rupture of structural ceramics is governed by the mean stress in a specific zone, rather than by the peak stress value. The size of the process zone was derived as…
Ballistic effects are reviewed which allow the determination of scattering rates of local groups of electrons on the Fermi surface of metals. Significant progress in our understanding of scattering mechanisms has been made in the last decade through the improved capabilities of high frequency size effects. The anisotr…
We present the polarization-included electron-gas (PEG) model for crystal structures, which is similar to the modified-electron-gas (MEG) model for crystal structures, but in which the anions can distort from spherical symmetry. This nonspherical distortion is important when the anions occupy low-symmetry positions. F…
Abstract The polyaddition reactions of alicyclic diamines such as 1,4‐diaminocyclohexane (1,4‐CHDA) or 4,4′‐diaminodicyclohexylmethane (DCHM) and configurational isomers of 1,4‐CHDA or DCHM with tetracarboxylic aromatic anhydrides in aprotic solvents were carried out to prepare high molecular weight poly(amic acid)s.…
The structure of glasses, melts, and supercooled melts in the system BaO-SiO 2 with BaO/SiO 2 =0.367 has been investigated in situ with Raman spectroscopy from 25 to 1669°C. For this purpose a technique has been developed that integrates confocal micro-Raman spectroscopy with a microheating stage that fits on the samp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface attachment of well-defined redox-active polymers and block polymers via terminal functional groupsD. Albagli, G. C. Bazan, R. R. Schrock, and M. S. WrightonCite this: J. Am. Chem. Soc. 1993, 115, 16, 7328–7334Publication Date (Print):August 1, 1993Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFactors influencing the formation of thermally reversible gels comprised of cholesteryl 4-(2-anthryloxy)butanoate in hexadecane, 1-octanol, or their mixturesInna Furman and Richard G. WeissCite this: Langmuir 1993, 9, 8, 2084–2088Publication Date (Print):August 1, 1993Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR surface site analysis of pillared clays using pyridine probe speciesStephen A. Bagshaw and Ralph P. CooneyCite this: Chem. Mater. 1993, 5, 8, 1101–1109Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993htt…
AEROSPACE applications demand the ultimate performance out of every material used and at this year's Paris Show, Du Pont highlighted the significance of new developments in high‐grade low and elevated temperature composites and their potential for the future. Latest among the advances introduced were thermoplastic eng…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTailored magnetic properties in trinuclear copper(II) complexes: synthesis, structure, and magnetic properties of complexes derived from [1,3-propanediylbis(oxamato)]cuprate(II) ([Cu(pba)]2-)Ramon Costa, Auxiliadora Garcia, Joan Ribas, Talal Mallah, Yves Journaux, Jorunn Sle…
Stress corrosion cracking (SCC) of rapidly solidified magnesium-aluminum alloys in aqueous solutions of potassium chromate and sodium chloride was investigated using electrochemical techniques, constant displacement rate tests, and optical and electron microscopy. Microcrystalline alloys containing 1 and 9 wt% aluminu…
The T4 lysozyme mutant Ser 117-->Phe was isolated fortuitously and found to be more thermostable than wild-type by 1.1-1.4 kcal/mol. In the wild-type structure, the side chain of Ser 117 is in a sterically restricted region near the protein surface and forms a short hydrogen bond with Asn 132. The crystal structure of…
The crystal structure of three calcic C2/m amphiboles with different Cl contents have been refined to R indices of ∼2% using MoKα X-radiation. The monovalent anion site is split into two distinct sites, O3 and O3', that are separated by ∼0.5A along [100] and are occupied by (OH,F) and Cl, respectively. The variation i…