Effects of sub-Tg annealings on the anelastic relaxation in poly(methyl methacrylate)
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X-ray absorption spectroscopy under high pressure
X-ray absorption spectroscopy has been combined with high pressure in order to investigate phase transitions. Information obtained by these techniques will be illustrated by recent experiments performed on different types of materials (semiconductors, molecular solids, glasses,…). The future developments (combination…
A novel biodegradable poly(urethane ester) synthesized from poly(3-hydroxybutyrate) segments
ADVERTISEMENT RETURN TO ISSUEPREVArticleA novel biodegradable poly(urethane ester) synthesized from poly(3-hydroxybutyrate) segmentsYoji Hori, Motoki Suzuki, Yoshiki Okeda, Takashi Imai, Minzo Sakaguchi, Yoko Takahashi, Akio Yamaguchi, and Susumu AkutagawaCite this: Macromolecules 1992, 25, 19, 5117–5118Publication Da…
Tridecavanadate, [H12V13O40]3-
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTridecavanadate, [H12V13O40]3-Lage Pettersson, Ingegaerd Andersson, and Oliver W. HowarthCite this: Inorg. Chem. 1992, 31, 20, 4032–4033Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.acs.…
Effect of added Cu on the Nd-rich phase in hot-deformed NdFeB magnets
It is found that the addition of Cu to NdFeB magnet material changes the composition of the grain-boundary phase from NdFe based phase to binary NdCu. It is also found that when the grain boundary phase is liquid, it can dissolve significant amounts of the 2-14-1 phase, and when liquid phase is extruded from the sampl…
Comparison of Redox Initiators Reactivities in the Grafting of Methyl Methacrylate onto Chitin
Relative reactivities of potassium persulfate (KPS) and ferrous ammonium sulfate-potassium persulfate (FAS-KPS) systems, in aqueous medium, as initiators for grafting of methyl methacrylate (MMA) onto chitin, were studied. Evidence of grafting was obtained from IR spectroscopic measurements of the grafted and ungrafte…
A wide bandwidth, dynamic hysteresis model for magnetization in soft ferrites
A wide bandwidth, dynamic model for the magnetization of the core material used in pulse transformers must be able to perform accurate circuit simulations involving such transformers. The authors have obtained such a model by combining the approaches used in the static hysteresis models of D.C. Jiles and D.L. Atherton…
Phase relations in the system Sm-Fe-Ti and the consequences for the production of permanent magnets
Phase relations in the Fe-rich corner of the Sm-Fe-Ti system were investigated by means of microstructural examinations, EDX, and thermal and thermomagnetic analyses. Between 1000 degrees C and 800 degrees C, equilibria of Sm(Fe, Ti)/sub 12/ with the phases alpha -Fe, Fe/sub 2/Ti, and Sm(Fe, Ti)/sub 9/ were found, whi…
Accurate description of surface ionization in electron probe microanalysis: An improved formulation
Abstract A new analytical expression of the surface ionization Φ(0) is derived in terms of atomic number and overvoltage. This expression is obtained by means of an analytical description of the energy distribution of backscattered electrons. The Φ(0) data for Pt, W, Sb, InSb, Ni, Co and Mg have been measured using th…
Raman scattering from cubic boron nitride up to 1600 K
Raman scattering measurements on cubic boron nitride up to 1600 K are reported. The results indicate that at 1600 K the interatomic force constant is only ∼10% weaker than at room temperature and that cubic BN is therefore a good candidate for applications where high-temperature mechanical strength is required. Howeve…
In vitrocorrosion fatigue of 316L cold worked stainless steel
The corrosion resistance of 316L cold worked stainless steel depends upon its thin protective oxide layer; and if this is partially broken down, corrosion resistance depends upon its tendency for repassivation. Since the intended function of stainless-steel implants is to sustain musculoskeletal forces, research towar…
Picosecond laser-induced fluorescence polarization studies of mitoxantrone and tetrakis porphine/DNA complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond laser-induced fluorescence polarization studies of mitoxantrone and tetrakis porphine/DNA complexesYizhong Shen, P. Myslinski, Teresa Treszczanowicz, Yixian Liu, and J. A. KoningsteinCite this: J. Phys. Chem. 1992, 96, 19, 7782–7787Publication Date (Print):Septemb…
Chemical and mineralogical characteristics of Pleistocene caliche deposits from the Central Ebro Basin, NE Spain
Abstract Chemical and mineralogical analyses of fossil caliche profiles developed on top of Lower Pleistocene alluvial formations in the East-central sector of the Ebro basin indicate that they have high content of carbonate (average 84%) and high Ca/Mg ratios (average 136). The clay mineral assemblages vary slightly…
Influence of concentration on the activation energy for diffusion in polymer‐solvent systems
Abstract The self‐diffusion of benzene, toluene, and ethylbenzene in polystyrene have been analyzed using the Vrentas/Duda free‐volume diffusion model. Diffusion coefficient predictions suggest an exponential concentration dependence of the activation energy required to overcome attractive forces, E . Without the use…
Dielectric Properties of SrTiO3 Epitaxial Film and Their Application to Measurement of Work Function of YBa2Cu3Oy Epitaxial Film
The dielectric properties of SrTiO 3 epitaxial film were studied using film grown on oxide superconductor YBa 2 Cu 3 O y . They were, to a certain extent, similar to those of the single-crystal bulk in terms of both temperature and electric field dependence, though the value of the dielectric constant was low, particu…
Starting material oriented retrosynthetic analysis in the LHASA program. 1. General description
This paper introduces and gives an overview of the starting material oriented analysis package in lhasa.
Preparation of PbTiO 3 Thin Films by an Excimer Laser Ablation Technique with Second Laser Irradiation
Ferroelectric PbTiO 3 thin films have been formed on based electrodes of Pt or oxide superconductor ((La, Sr) 2 CuO 4 ) by an ArF excimer laser ablation technique. A second laser irradiation at the substrate surface is quite effective in the crystallization of the films at low substrate temperature below 400°C. The su…
The Thermal Conversion of Poly[(silylene)‐diacetylene] Metal Oxide Composites: A New Approach to β‐SiCMC Ceramics
Cross‐linking of 1, formation of a SiC network, and reduction of the encapsulated TiO 2 particles are the three steps in the reaction of poly[(dimethylsilylene)diacetylene] ( 1 ) and TiO 2 which produces SiCTiC ceramics [Eq. (a)]. The reduction of the metal oxide in this case is possible at much lower temperatures th…
Initial Development of Microdamage Under Impact Loading
In this paper, the initial development of microdamage in material subjected to impulsive loading was investigated experimentally and analytically with controllable short-load duration. Based on a general solution to the statistical evolution of a one-dimensional system of ideal microcracks, a prerequisite to experimen…
Effects of sulfate reduction on CaCO 3 dissolution and precipitation in mixing-zone fluids
Abstract Sulfate reduction in the sea-water end member of mixing-zone fluids changes the fluid-saturation indices for carbonate minerals. Mixing-zone fluids were modeled quantitatively using Atlantic sea water and a fresh-water end member from Barbados for sulfate reduction in the presence of goethite, in the absence…