Materials Literature
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Current trends in the electronics and optoelectronics industries involving computing, data processing, sensing and communications all point toward a continuing need for improved materials and new multifunctional structures. The continuing and unrelenting drive toward higher bit density and greater integration has led…
Three photolabile precursors of glycine containing a photosensitive 2-nitrobenzyl moiety attached to the amino group have been synthesized. When exposed to ultraviolet radiation between 308 and 350 nm, the compounds photolyze to release glycine, an important inhibitory neurotransmitter in the central nervous system. T…
Experiments on stored energy have been carried out for three types of cold rolled aluminium and copper characterised by different texture and structure. In the first type, the shear texture has been obtained in the surface layers of the examined materials rolled in one pass at a high l/h ratio (where l is the projecte…
A method of calculation was developed for evaluating the contributions of external (gamma) and internal (alpha) doses due to the natural radioactivity of building materials. The radionuclides examined are 40 K and members of the 235 U, 238 U and 232 Th radioactive decay chains. The method makes it possible to correlat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer size exponents of branched dextransJ. A. M. Smit, J. A. P. P. Van Dijk, M. G. Mennen, and M. DaoudCite this: Macromolecules 1992, 25, 13, 3585–3590Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://…
Quenching technology is a vital and complex part of many heat treatment processes. The microstructure and mechanical properties of the material, as well as its residual stresses, largely depend upon it. Today, quenching is an interdisciplinary field of science and technology based on wide theoretical knowledge and sup…
Abstract The weathering of biotite in Quaternary lahars from Monti Ernici (Central Italy) via interstratification stages has been studied by X-ray diffraction of both the interstratified minerals and the initial (biotite) and final (vermiculite) end-members. The structure of the biotite and vermiculite is described by…
A phase of antiferroelectric type of hysteresis preceding the transition to the ferroelectric state has been observed in Thallium Indium sulfide crystals. A possible coexistence of polar regions and domains of the ferroelectric and the T C1 - T C2 phases over a wide range of temperature is suggested from analysis of d…
Abstract A new procedure was developed for the synthesis of low‐substituted, soluble cellulose formates. In a mixture containing cellulose, formic acid, phosphoric acid and water, cellulose can be dissolved within several hours, and after 24 h cellulose formates with a DS of about 0.6 that are soluble in DMSO could be…
Abstract The Fourier transform Raman spectrum from 100 to 3300 cm −1 of liquid and polycrystalline pyrazole, magnified image was recorded. The frequencies for several of the fundamentals are significantly different from those obtained from the Raman spectra of solutions. The data are interpreted in detail. The previou…
Using Landau-Devonshire's theory for microregions of a material presenting a diffuse ferroelectric phase transition we have obtained the smeared behaviour of its dielectric permittivity. This generalization of the classical phenomenological theory contains the Smolensky-Isupov's behaviour near the dielectric maximum.…
(A,E,B)-invariant and (E,A,B)-invariant subspaces for the two-dimensional singular Roesser model are investigated. These subspaces are related to the existence of the solutions when the boundary conditions are in these subspaces. Also, the existence of a solution sequence in certain subspaces derived from the invarian…
The presence of TiC or TiN paritcles in an Al 2 O 3 matrix affects the thermal stability of the composites in oxidizing environments. In isothermic oxidation tests at 700°, 800°, 900°, 1000°, and 1100°C for up to 20 h, two different oxidation regimes have been observed at T < 900°C and at 900°C ≤ T ≤ 1100°C. At low…
An eight-coordinate manganese(II) ion is found in dication 1, the first complex between the [2.2.2]cryptand and a transition metal. The O- and N-donor centers take up positions at the corners of an almost perfect cube. The formation of this extremely rare coordination polyhedron for MnII can be attributed to the high…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParticle beam-induced reactions versus thermal degradation in PMDA-ODA polyimideGiovanni Marletta, Fabio Iacona, and Andras TothCite this: Macromolecules 1992, 25, 12, 3190–3198Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin crossover, dimerization, and structural dynamics of manganocenes probed by deuterium NHR spectroscopyFrank H. Koehler and Bjoern SchlesingerCite this: Inorg. Chem. 1992, 31, 13, 2853–2859Publication Date (Print):June 1, 1992Publication History Published online1 May 2002…
Abstract Novel 1,3,4‐oxadiazole‐containing polyazomethines were synthesized by the polycondensation of diamines, 2,5‐bis ( m ‐aminophenyl)‐1,3,4‐oxadiazole (BMAO) and 2,5‐bis ( p ‐aminophenyl)‐1,3,4‐oxadiazole (BPAO), with aromatic dialdehydes, isophthalaldehyde and terephthalaldehyde, in m ‐cresol at 20°C. These poly…
Abstract X-ray diffraction studies of the pore-lining chloritic mineral from the Tuscaloosa Formation disclose a marked pattern of odd-order line broadening for the 001 to the 00,16 reflections. The odd-order peaks are approximately twice as broad as the even orders after correction for instrumental broadening effects…
Abstract It is shown that the nth center of a radical ring coincides with that of its adjoint group, from which a result of Jennings is sharpened and a conjecture of his is confirmed.
Abstract We investigate the validity of methods for background correction in XPS by comparing determined peak intensity ratios with theory. For Ag, Pt and Au, peaks are considered for which possible errors in the inelastic electron mean free path and in the energy dependence of the analyser response function have mini…