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Hydrous Tantalum Phosphates for Ion Exchange Purposes: A Systematic Study
This work describes two methods of preparation of hydrous tantalum phosphates and their characterization as ion exchangers. The hydrous metallic phosphate compounds were chemically and physically characterized by thermal gravimetric analysis, X-ray diffractometry and surface area measurements. By the first method, tan…
Transição de Fase Difusa e Propriedades Dielétricas de Cerâmicas Ferroelétricas de (Pb, Ba)Nb2O6
Tungsten bonze structured lead barium niobate (Pb1-xBa xNb2O6) ferroelectric ceramics were prepared by the conventional mixed oxide method and their dielectric properties were carefully investigated. All studied samples presented elevated values of maximum dielectric constant (epsilon'm) and its corresponding temperat…
Influence of Fiber Length Distribution on Strength Efficiency of Fibers in Yarn
The tensile and tear strengths and hence the durability of a cotton fabric are greatly influenced by the length and strength of cotton fibers in addition to the fabric structure. This is so because fiber length to a large extent determines yam strength, which ultimately contributes to fabric strength. Also, fiber leng…
The Coordination of CuII in Zeolites − Structure and Spectroscopic Properties
Zeolites loaded with transition metal ions are promising heterogeneous catalysts. Knowledge about the location and structure of the metal centers is of paramount importance for the understanding of the catalytic potential of these materials. In this work, the spectroscopic studies of the coordination of CuII in zeolit…
Clay Mineralogy of Phyllic and Intermediate Argillic Alteration at Bingham, Utah
The earliest alteration mineral zones in the porphyry Cu-Mo-Au ore deposit at Bingham, Utah, include the outermost propylitic and inner potassic alteration of igneous rocks. Innermost phyllic and intermediate argillic alteration is superimposed on propylitic and potassic alteration. Petrographic, X-ray diffraction, an…
Three-Dimensional Computer Modeling of Warp Knitted Structures
In this work, a 3D computer aided designing (CAD) system is developed for solid modeling and visual simulation of warp knitted structures on Silicon Graphics workstations. In the first part, a three-dimensional cylindrical and uniform solid yarn model is developed, such that its central axis is a space curve, using no…
A VO2-Based Multifunctional Window with Highly Improved Luminous Transmittance
A novel window structure composed of VO 2 thermochromic film with TiO 2 antireflection (AR) coating was proposed. TiO 2 was chosen as the best AR candidatefor reasons that it is an AR material superior to the reported SiO 2 , and that it is capable to make the window multifunctional with excellent photocatalytic prope…
Electron inelastic mean free path for Ti, TiC, TiN and TiO 2 as determined by quantitative reflection electron energy‐loss spectroscopy
Abstract Electron inelastic mean free paths (IMFP) have been estimated for Ti, TiC, TiN and TiO 2 for energies between 250 and 2000 eV. The IMFP values have been derived from the respective energy‐loss function (i.e. Im{−1/ ϵ }) on the basis of the model developed by Yubero and Tougaard for quantitative analysis using…
Electronic polarizability, optical basicity, and interaction parameter of La2O3 and related glasses
The electronic polarizability and optical basicity of La2O3 and related glasses have been determined from ultraviolet absorption spectra and calculations based on the Lorentz–Lorenz equation. The optical basicity for La2O3 oxide is found to be 1.07, being much larger compared with typical glass-forming oxides such as…
Silica–Carbon Nanocomposites—A New Concept for the Design of Solar Absorbers
To create materials that are composites or hybrids structured on the nanometer scale or the meso-domain, respectively, is one of the major tasks in modern materials science. In this paper, we demonstrate general strategies on how to obtain these nanocomposites founded on the knowledge about ordered mesoporous material…
Biomineralization of the Spicules of Sea Urchin Embryos
The formation of calcareous skeletal elements by various echinoderms, especially sea urchins, offers a splendid opportunity to learn more about some processes involved in the formation of biominerals. The spicules of larvae of euechinoids have been the focus of considerable work, including their developmental origins.…
Molecular Dynamics and Free Energy Analyses of Cathepsin D−Inhibitor Interactions: Insight into Structure-Based Ligand Design
In this study, we compare the calculated and experimental binding free energies for a combinatorial library of inhibitors of cathepsin D (CatD), an aspartyl protease. Using a molecular dynamics (MD)-based, continuum solvent method (MM-PBSA), we are able to reproduce the experimental binding affinity for a set of seven…
An inverse Jiles-Atherton model to take into account hysteresis in time-stepping finite-element calculations
A modified Jiles-Atherton model presenting the magnetic induction as an independent variable is proposed in order to be directly used in time-stepping finite-element calculations applied to the magnetic vector potential formulation. This model is implemented in the field calculation procedure by introducing a differen…
The Impact of Rigidity and Water Exchange on the Relaxivity of a Dendritic MRI Contrast Agent
Variable-temperature, multiple magnetic field (17)O NMR, EPR and variable-temperature (1)H nuclear magnetic relaxation dispersion (NMRD) measurement techniques have been applied to Gadomer 17, a new dendritic contrast agent for magnetic resonance imaging. The macromolecule bears 24 Gd(dota)-monoamide chelates (dota=N,…
Orientation Control and Fixation of Discotic Liquid Crystal
Abstract We established hybrid, horizontal, vertical, and vertical‐twisted alignment of discotic liquid crystals on web‐coating thin film. Newly developed materials are the photopolymerizable discotic liquid crystals, in order to fix desired novel alignment, the alignment promoters that deposit toward air surface duri…
Excitations in time-dependent density-functional theory
An approximate solution to the time-dependent density functional theory (TDDFT) response equations for finite systems is developed, yielding corrections to the single-pole approximation. These explain why allowed Kohn-Sham transition frequencies and oscillator strengths are usually good approximations to the true valu…
Preparation and Characterization of Carbon Nanotube/Polyacrylonitrile Composites
The incorporation of carbon nanotubes in polymer matrices should lead to composites with unique properties. It is thus tempting to use NT for mechanical reinforcement and to obtain new materials with unusual mechanical properties. However, the ultimate performance of such materials is expected to depend strongly on th…
Quasi-two-dimensional organic superconductors: A review
Quasi-two-dimensional organic superconductors are reviewed. These systems exhibit many interesting phenomena, including reduced dimensionality, strong electron - electron and electron - phonon interactions and the proximity of antiferromagnetism, insulator states and superconductivity. Moreover, it has been possible t…
Advantages of Combined Kinetic Analysis of Experimental Data Obtained under Any Heating Profile
The combined kinetic analysis of experimental data for solid-state reactions obtained under different experimental conditions is discussed. It is shown that the combined analysis of experimental data by means of the logarithmic expression of the general differential equation is a suitable method for the determination…