Materials Literature
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Abstract. We present models of the microstructure of martensite that occurs when twinned layers of martensite meet a pure variant. This microstructure often occurs below the A, temperature, with loading that favors the passage from one pure variant of martensite to another. This microstructure gives a mechanism for va…
The behavior of fiber-reinforced composites is governed by the crack-bridging force provided by the fibers, which can be obtained by the analysis of debonding and bending of fibers across a crack. In this paper, a micromechanical model for the analysis of crack-bridging force is developed. As fiber debonding has been…
Thrombosis remains a significant and potentially catastrophic complication of polyethylene terephthalate (Dacron) prosthetic vascular graft implantation. Numerous attempts have been made to create a novel surface that reduces the adverse effects of blood interaction with the material. The purpose of this study was to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStretching-Induced Correlations in Triblock Copolymer Gels As Observed by Small-Angle Neutron ScatteringK. Reynders, N. Mischenko, K. Mortensen, N. Overbergh, and H. ReynaersCite this: Macromolecules 1995, 28, 25, 8699–8701Publication Date (Print):December 1, 1995Publication…
A rigorous theory is developed for the ordering interaction J(R ij) in a crystal having a structural phase transition when J(R ij) is mediated by elastic relaxation in the material. The ordering process in cell i sets up a local stress field due to the sizes, shapes or displacements of atoms or atomic groups, which pr…
Abstract— We have developed a novel scheme to drive bistable reflective cholesteric displays, in which the optical state of a pixel is determined by a pulse shorter than 1.0 ms. This scheme takes advantage of the rapid transition of the cholesteric liquid crystal from the homeotropic state to the transient planar stat…
During the past few years, a new theory of martensite has been developed in which microstructure is predicted by energy minimization ([1, 2]). The theory is based on a crystallographic model, and the continuum theory is obtained from this model by using the Cauchy-Born rule to relate atomic to macroscopic deformation.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCocrystallization and Phase Segregation of Polyethylene Blends between the D and H Species. 8. Small-Angle Neutron Scattering Study of the Molten State and the Structural Relationship of Chains between the Melt and the Crystalline StateKohji Tashiro, Kouji Imanishi, Masaaki…
In X-ray storage phosphors an image is formed and stored by generation of room temperature stable radiation-induced electron and hole trap centres. The image is read-out by recording a photo-stimulated luminescence (PSL) from a doped activator, generally stimulating the electron trap centres. The best-known and hither…
Based on the ideas of Landau-de Gennes theory applied to nematic liquid crystals, several forms for the variation of the order parameter as a function of temperature are investigated over a wide nematic range. These functional forms are used to fit the experimental order parameters, determined through the use of C-13…
Abstract The paper consides the effects of compatibilization with maleic anhydride grafted polypropylene (PP‐g‐MAH) on the propertie of immiscible blends of polypropylene (PP) and nylon 6 (N6). We prepared the blends by three different mixing processes; single‐step blending, two‐step blending with reactive premixing,…
The ground state single-electron reduced density matrix is shown to contain the essential chemical bonding information relevant for calculating the nonlinear optical response of conjugated polymers. Applications to a series donor-acceptor substituted Hexatrienes demonstrate the interplay of electronic structure and dy…
Abstract Cu montmorillonite heated with or without potassium halide was studied by IR and ESR spectroscopy, supplemented by XRD measurements, microprobe and chemical analyses. It appears that on heating Cu montmorillonite, most of the Cu ions migrate into hexagonal cavities and eventually, when dehydroxylation occurs,…
ABSTRACT Experiments were undertaken in a recirculating flume to determine the relationships among water velocity, thallus area, drag, and the probability of thallus breakage or detachment in the foliose green alga Ulva lactuca L. In all specimens tested to breaking point, thalli detached from their bivalve substrates…
The dynamics of a Sm-${\mathit{C}}^{\mathrm{*}}$ director field in an ac electric field has been studied by means of light scattering. Scattering of resonance type has been observed by variation of field frequency at fixed temperatures. The resonance scattering is suppressed in high electric fields, at low temperature…
The proposed pH buffering and phosphagenic functions of polyphosphate were investigated by subjecting chemostat-cultivated Saccharomyces cerevisiae to alkalinization (NaOH addition) and anaerobiosis. The subsequent changes in intracellular phosphate-containing species were observed in situ by nuclear magnetic resonanc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron Reflectometry Study of Surface Segregation in an Isotopic Poly(ethylenepropylene) Blend: Deviation from Mean-Field TheoryL. J. Norton, E. J. Kramer, F. S. Bates, M. D. Gehlsen, R. A. L. Jones, A. Karim, G. P. Felcher, and R. KlebCite this: Macromolecules 1995, 28, 25…
Abstract Titanites rich in antimony (up to 12.59 wt.% Sb 2 O 5 ; equal to 0.165 Sb 5+ per Si 4+ = 1.000) arc described for the first time. They coexist with various greenschist-facies minerals in three different petrographical environments in the manganese concentrations at St. Marcel-Praborna in the Aosta Valley, Ita…
Abstract The resin transfer molding (RTM) technique often utilizes reinforcement with a complex fiber architecture. Several parameters, including the permeability tensor, are necessary to characterize the flow behavior in these intricate fibrous porous media. In this paper, a general procedure for extracting three‐dim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation and Stability of Ni(I) Ions in MCM-41 Mesoporous Molecular SievesMartin Hartmann, Andreas Poppl, and Larry KevanCite this: J. Phys. Chem. 1995, 99, 49, 17494–17496Publication Date (Print):December 1, 1995Publication History Published online1 May 2002Published iniss…