Materials Literature
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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…
Abstract Melt blends of thermoplastic polyurethane (TPU) and Poly(styrene‐co‐acrylonitrile), (SAN) of various compositions were prepared using a two‐roll mill. Two blends of composition 70:30 and 50:50 TPU/SAN were selected for compatibility studies. The compatibility effect of SMA on these incompatible blends was stu…
Blue photoluminescence with high quantum efficiency is emitted by both the singlet and triplet excited states of the 7-azaidolate-containing tetrameric zinc(II) cluster (Zn4O(AID)6) (see Figure) in solution and in the solid state at room temperature. A blue light–emitting diode with Zn4O(AID)6 as the active layer is s…
The complexation of a cationic poly( p -phenylene) with tetraethylammonium perfluoro-1-octanesulfonate results in a highly fluorescent polymeric complex which forms cylindrical aggregates in solution and a columnar mesomorphous structure in the solid state. Two columns per unit cell are arranged in a rectangular two-d…
Three montmorillonites SWy-2 (Wyoming, USA), STx-1 (Texas, USA) and SAz-1 (Cheto, Arizona, USA) and a saponite Sap-Ca (California, USA) were activated with different amounts of Al 3+ and tetramethylammonium (TMA + ) cations to obtain materials with a combined Al 3+ and TMA + content equal to their CECs. The catalytic…
A series of diamines with various chlorine content was synthesized. Using these novel diamines, a series of new chlorinated polyimides was prepared by reacting them with 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA). The purpose was no investigate the effect of the chlorine content on the properties…
Diffusion of asymmetric diblock and triblock copolymers in a three-dimensional periodic potential field with body centered cubic (bcc) symmetry is simulated numerically using Langevin dynamics. To simulate unentangled copolymer melts, a spring and bead model ( Rouse ) is introduced. To simulate entangled polymer melts…
Measurements of the phase delay of the current and force on a ring floated on a commonly available Thomson’s jumping ring apparatus were performed for phase angles from 12° to 88°. The force and phase data show excellent agreement with a linear inductive model. We find that the demonstration, as usually performed with…
A surface-enhanced Raman scattering (SERS) study has been performed for benzyl phenyl sulfide (BPS) and dibenzyl sulfide (DBS) in aqueous gold sol to examine the feasibility of the occurrence of surface-induced photoreactions of aromatic sulfides. Although BPS and DBS were reported to be decomposed into mercaptides on…
An improvement of methods for estimating the rotational temperature from the partially resolved 391.44 nm emission band of N 2 + (B 2 u + - X 2 g + ) has been developed by numerically studying this band as a function both of the temperature and of the instrumental function of the detection system. We give a simple tab…