The Potentials of Groundnut Shell Ash as Concrete Admixture
Rosana G. Moreira, Editor-in-Chief; Texas A&M University
Materials Literature
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Electrical modeling of liquid crystal displays-LCDs
An investigation into the complex dielectric permittivity of nematic liquid crystal (NLC) on homogeneous (or planar, molecular director axis parallel the surface of the cell) and homeotropic (molecular director axis perpendicular the surface of the cell) alignments led to the conception of special equivalent electric…
PREPARATION OF Au-LOADED TiO2 BY PHOTOCHEMICAL DEPOSITION AND OZONE PHOTOCATALYTIC DECOMPOSITION
In this paper, Au -loaded TiO 2 ( Au/TiO 2 ) photocatalysts were prepared by photochemical deposition method and characterized by transmission electron microscopy, diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The results indicated the metallic Au nanoparticles were deposited on the surface of…
Interaction of cationic 5,10,15,20-tetrakis(4-N-methyl pyridyl) porphyrin with mono-and polynucleotides: A study by picosecond fluorescence spectroscopy
The interaction of water-soluble cationic 5,10,15,20-tetrakis(4- N -methyl pyridyl) porphyrin (H 2 TMPyP4) with some mono-and polynucleotides is studied by time-resolved and steady-state fluorescence spectroscopy, as well as by steady-state absorption spectroscopy. The fluorescence decay kinetics are analyzed by recon…
Polyvinylamine Boronate Adhesion to Cellulose Hydrogel
The adhesion of polyvinylamine to wet cellulose was significantly enhanced by the presence of pendant phenylboronic acid groups. It is proposed that adhesion results from boronate ester formation with cellulose at pH > 8. Experiments with phenol derivatized polyvinylamine gave low adhesion supporting the fact that the…
Phase Transitions and Photoinduced Non-Linear Optics in TEA-CoCl2Br2Nanocrystallites
The photoinduced non-linear optics effects in the TEA-CoCl 2 Br 2 nanocrystallites incorporated into the photopolymer olygoetheracrylate matrices were investigated. The temperature dependence of the photoinduced second harmonic generation demonstrates a remarkable dependence on temperature near the phase transitions.…
Quality Control of Textile Electrodes by Electrochemical Impedance Spectroscopy
In this paper an electrochemical cell is developed to test and follow-up the quality of electrodes made of knitted, woven and non-woven conductive textile material. This cell is constructed of two electrodes planarly positioned against each other using a series of PVC plates. The obtained impedance, as a result of app…
The Mechanism of the Air-Jet Texturing: The Role of Wetting, Spin Finish and Friction in Forming and Fixing Loops
A comprehensive review of the roles played by the airflow, wetting and spin finish on the air-jet texturing process is given. The results of an experimental investigation of the air-jet texturing process using residual spin finish, yarn-to-yarn static and kinetic friction, filament strength, filament diameter, and on-…
Modification of Cross‐Linked Rubber Particles by Free Radical Polymerization
Abstract The synthesis of polystyrene chains covalently bound to the surface of cross‐linked rubber particles from recycled tires (ground tire rubber, GTR) was investigated via free radical polymerization in situ by using azobisisobutyronitrile (AIBN) and dibenzoyl peroxide (BPO) as initiators. Indeed, the graft polym…
Laser photoluminescence spectrometer based on charge-coupled device detection for silicon-based photonics
We describe and characterize a multichannel modular room temperature photoluminescence spectroscopy system. This low cost instrument offers minimization of size and complexity as well as good flexibility and acceptable spectral resolution. The system employs an efficient flexible front end optics and a sensitive spect…
Slow relaxation processes in nematic liquid crystals at weak surface anchoring
We present new results of experimental investigations of azimuthal director reorientation dynamics for a nematic liquid crystal on solid substrates. Two types of substrate with weak anchoring were studied: glass/polystyrene and glass/UV‐activated dye. Slow and fast relaxation processes were observed in both cases unde…
Shear-driven and pressure-driven flow of a nematic liquid crystal in a slowly varying channel
Motivated by the industrially important processes of blade coating and cavity filling of liquid crystalline materials, we consider steady, two-dimensional shear-driven (Couette) and pressure-driven (plane Poiseuille) flow of a thin film of a nematic liquid crystal in the slowly varying channel formed between a fixed b…
Typification of Conferva pectinalis O. F. Müll. ( Bacillariophyceae ) and the identity of the type of an alleged synonym, Fragilaria capucina Desm.
Abstract The application of the generic name Fragilaria has remained uncertain because the identity of the lectotype, Conferva pectinalis O. F. Müll., is unknown. Traditionally Fragilaria capucina Desm. has been considered a synonym of F. pectinalis, although this synonymy has not been confirmed. Application of the ge…
Dynamical core-hole screening in the x-ray absorption spectra of graphite,C60, and carbon nanotubes: A first-principles electronic structure study
We have implemented the effect of dynamical core-hole screening into a first principles electronic structure computational scheme. The method has been applied to the x-ray absorption spectrum of the carbon $K$-edge for graphite, fullerene ${\mathrm{C}}_{60}$ molecules, and single-wall carbon nanotubes. We demonstrate…
Thermodynamics and kinetics of cation ordering in natural and synthetic Mg(Al,Fe3+)2O4 spinels from in situ high-temperature X-ray diffraction
One natural and two synthetic spinels with compositions Mg(Al 1-z Fe z 3+ ) 2 O 4 (with 2z = 0.078, 0.138, and 0.200, respectively) were studied by in situ, high-temperature, single-crystal X-ray diffraction. All samples were heated from room temperature to 1050 °C. Thermal expansion was monitored by measuring the cel…
Phase Transition and Temperature Dependences of Electrical Properties of [Bi0.5(Na1-x-yKxLiy)0.5]TiO3 Ceramics
Lead-free piezoelectric ceramics [Bi 0.5 (Na 1- x - y K x Li y ) 0.5 ]TiO 3 (abbreviated BNT–BKT–BLT) were prepared by the conventional oxide method. The effects of BKT and BLT amounts on the phase transition and electrical properties were examined. BNT–BKT–BLT ceramics give good performances with piezoelectric consta…
Targeted bioavailability of drugs by triggered release from liposomes
The temperature-sensitive liposome is now in Phase I human clinical trials. This review will provide an update, recapping earlier work and presenting new data that show unexpected mechanistic features that make this triggered-release system an emerging new paradigm for local drug delivery.
A RIVER TERRACE SOIL CHRONOSEQUENCE OF THE PAKUA TABLELAND IN CENTRAL TAIWAN
Soils science and fluvial geomorphology meet on the subject about flights of river terraces whose treads rise like stairs above active channels. The Pakua tableland in central Taiwan consists of widely unpaired terraces, including six levels in altitude formed by successive river incision. The terraces serve as geomor…
Characterization of radio frequency plasma using Langmuir probe and optical emission spectroscopy
The radio frequency plasma generated during the sputtering of Indium Tin Oxide target using Argon was analyzed by Langmuir probe and optical-emission spectroscopy. The basic plasma parameters such as electron temperature and ion density were evaluated. These studies were carried out by varying the RF power from 20to50…
Radiation hardness of a polycrystalline chemical-vapor-deposited diamond detector irradiated with 14 MeV neutrons
Chemical-vapor-deposited (CVD) diamond films are considered as neutron detectors for nuclear fusion devices because of their radiation hardness. Data about the radiation hardness of polycrystalline CVD diamond films exposed to 14 MeV neutron are missing in literature so the actual capability of CVD diamond detectors t…