Materials Literature
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In a polydisperse thermotropic main-chain liquid crystalline polymer, we observe the process of thermally induced nematic−nematic phase separation between short and long polymer chains. We study the dynamical features of this system, in particular the evolution of Schlieren textures formed by disclinations surrounding…
It has been widely known that both solute concentration, i.e., frictional effects, and stacking fault energy influence the degree of cross slip and slip planarity in face-centered-cubic alloys. Cross slip is preceded by constriction of two partial dislocations. A model is proposed for the energy required to form a con…
Hydroxylclinohumite Mg 9 [SiO 4 ] 4 (OH, F) 2 , a new mineral from Zelentsovskaya mine near Magnitka (Zlatoust district, Southwestern Urals), is the OH-dominant equivalent of clinohumite Mg 9 [SiO 4 ] 4 (F,OH) 2 . The crystal structure of hydroxylclinohumite has been refined from single-crystal X-ray data to R = 0.026…
Polysiloxanes bearing epoxy groups as lateral substituents were prepared by the hydrosilylation of 1-allyloxy-2,3-epoxypropane (allylglycidylether) with poly(hydrogenmethylsiloxane-co-dimethylsiloxane)s (DH-D copolymers) of various compositions. To determine the optimal conditions of the hydrosilylation catalyzed by h…
Solid-state 93 Nb static and MAS NMR and 93 Nb nutation studies of polycrystalline Pb(Mg 1/3 Nb 2/3 )O 3, (PMN) and (1 − x )Pb(Mg 1/3 Nb 2/3 )O 3 / x PbTiO 3 ( x = 0.05 to 0.50) solid-solutions are reported. The 93 Nb static and MAS NMR spectra of PMN measured at 14.1 T have two major resonances due to the central tra…
We consider a flat panel direct conversion x-ray image detector in which a photoconductor is used to directly convert absorbed x-ray photons to collectable electron hole pairs. The storage capacitor at each pixel stores a quantity of charge proportional to the incident radiation. The charge stored at each pixel is rea…
The aim of this paper is to present a general model of oriented continuum within the frame of Newtonian-Eshelbian continuum mechanics to describe macro- and microdeformations of solids taking into account the evolution of defects as voids and cracks. Within a manifold-theoretical setting, position- and direction-depen…
The physical characteristics and structures of the four commercial varieties of Indian silk fibres, namely Mulberry, Tasar, Eri and Muga, have been studied. It is observed that the silk filaments from the same cocoon show considerable variation in linear density. As one moves from the outer layers to the inner layers…
Brandholzite, a new magnesium antimony hydroxide hydrate mineral, Mg(H 2 O) 6 [Sb(OH) 6 ] 2 , has been discovered in Au-Sb-Quartz veins of the former mining district of Brandholz-Goldkronach, Fichtelgebirge, Germany. The new mineral is associated with stibnite and antimony-ochers and forms colorless, platelike crystal…
Cotton/polyester carpet materials are resistant to surface flame spread after esterification of the cellulosic fibers with polycarboxylic acid and suitable catalyst. The crosslinked cellulose-containing materials passed the re quired flammability standards for carpet when subjected to the methenamine pill test. This t…
Two Oxisols [Dusky Latosol (LR) and Dark‐Red Latosol (LE)] and one Entisol [Quartzous Sand (AQ)] of a watershed situated at the boundaries of the most important Brazilian aquifer, and intensively cropped to sugarcane, were studied in relation to their nitrate retention and leaching potential, and related electrochemic…
The swelling behavior of poly(acrylic acid) (PAA) gels in aqueous ethanol (EtOH) was investigated. These gels were prepared by γ-irradiation and pretreated in aqueous solutions of different pH levels in order to vary the charge density. With increasing pH of the pretreating solutions, a distinct collapse was observed…
Abstract The Devonian-Carboniferous reservoir of the Clair Field contains a complex and variably abundant clay mineral assemblage. An abrupt vertical change in clay mineralogy has been observed in both wells studied (UKCS 206/8-7 and 206/8-8) from being rich in Mg-chlorite, chlorite- smectite (including dioctahedral c…
Thin films of Ge-doped silica were prepared by radio-frequency sputtering in a controlled atmosphere of Ar and O2 and then subjected to ultraviolet irradiation under poling electric field (UV poling). Effects of oxygen mass flow content during the sputtering on the second-order nonlinearity of the films were investiga…
A series of carbohydrate-based stereoregular copolyamides have been prepared by the active ester polycondensation method. These new optically active polymers contain in their repeating units an aliphatic ω-amino acid and an ω-aminoaldonic acid, which is 5-amino-5-deoxy-2,3,4-tri- O -methyl- l -arabinonic acid in the c…
Gastrolith matrix protein (GAMP) is a novel protein purified from gastroliths of the crayfish, Procambarus clarkii, and has been suggested to be associated with calcium carbonate deposition. In the present study, a specific antibody against GAMP was raised and distribution of GAMP immunoreactivity was studied in crayf…
A quantitative study of the preferred orientation of lanthanum and calcium modified lead titanate thin films, including the measurement of pole figures and calculation of orientation distribution function (OD), is presented. The main preferential orientation components are identified as <001> and <100> perpendicular t…
A polyvinyl alcohol-slurry screening technology of phosphors was studied for field emission displays with a resolution up to supervideo graphics adapter. Phosphor lines were successfully patterned as narrow as 25 μm on 6 in. glass substrates. Process conditions such as spin coating speeds, exposure time, and shadow ma…
peer reviewed
We propose a method to analyze x-ray-absorption fine-structure data that avoids an arbitrary restriction of the size of the model-parameter space. It starts with an a priori guess of the model parameters which is introduced into the fitting procedure by Bayesian arguments. Two different descriptions are discussed to d…