Materials Literature
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A general adjoint coupled electron-photon Monte Carlo code for solving the Boltzmann-Fokker-Planck equation has recently been created. It is a modified version of ITS 3.0, a coupled electron-photon Monte Carlo code that has worldwide distribution. The applicability of the new code to radiation-interaction problems of…
The late-time phase-ordering kinetics of the O(n) model for a nonconserved order parameter are considered for the case where the O(n) symmetry is broken by the initial conditions or by an external field. An approximate theoretical approach, based on a ``Gaussian closure'' scheme, is developed, and results are obtained…
Abstract Sepiolite from Vallecas (Spain) was treated with HCl solutions (1.25; 2.5; 5.0; 10.0 and 20.0 wt%) at 25°C for 2, 6, 24 and 48 h. The solutions obtained after washing the acid treated samples were analysed and a kinetic model was applied to the cation dissolution data. The development of porosity and number o…
More than 50 manikins are in use world-wide. They represent various levels of development in terms of technique and performance. The more sophisticated are articulated manikins able to assume different postures and body movements. They are electrically heated and divided into several (up to 36) individually controlled…
The porous structures of synthetic active carbons have been examined in detail on the basis of nitrogen adsorption isotherms at 77 K using the αS method, the Dubinin–Stoeckli approach and the regularization technique. Analysis of the porosity of synthetic active carbons shows that carbons obtained under identical cond…
Article Mechanisms of Powder Milling Investigated by X-ray Diffraction and Quantitative Metallography was published on December 1, 1995 in the journal International Journal of Materials Research (volume 86, issue 12).
A survey of species of Synurophyceae in samples collected over the last ten years from freshwater bodies of central Portugal resulted in the identification of 33 taxa of Mallomonas and 6 of Synura , of which a total of 24 taxa are reported for the first time from Portugal by means of electron microscopy. A short ecolo…
Fe-based shape memory alloy ( SMA ) pipe couplings have been developed and successfully used in oilfields and chemical engineering departments. Using the pipe coupling connecting pipe line will avoid the serious corrosion near the welding zone, which usually occur due to the use of the traditional welding technique. T…
Two experiments delineate the nature of the broad, weak, 3-eV absorption band in Al2O3: (1) anion self-implants clearly establish its association with aluminum vacancies, and (2) optical properties of this V-type center are exemplified after hole transfer from Ti+4 impurities. These properties confirm a previous theor…
Abstract— Novel UV‐curable liquid crystals showing nematic phases at room temperature have been developed. The liquid crystals can be utilized to create retardation films with high quality and good thermal stability. The properties of novel UV‐curable liquid crystals and the fabrication of various kinds of retardation…
Wires of Ti-51.14 at.%Ni have been either solution treated and subsequently aged at 520°C or only aged. Differential thermal analysis (DTA) has been used to characterise the macroscopic behaviour of the martensitic transformation and transmission electron microscopy (TEM) to study the microstructure. It has been found…
Abstract. Thermomechanical training was canied out on a newly developed Fe-20Mn-6Si-7Cr-1Cu shape memory alloy. It was observed that the effectiveness of thermomechanical training largely depends on the recovery annealing temperature and the pre-strain during training. Based on the analysis of the changes in critical…
Silicate and oxide matrix CMCs are being developed for application in advanced gas turbines. High-performance Silicate/Nicalon CMCs have been characterised mainly as materials for interface, process and mechanical modelling due to their limited thermal and oxidative stability. Saphikon (Al{sub 2}O{sub 3}) monofilament…
The crystal structures of Me k [Fe(CN) 6 ]; l ·mH 2 O where Me = Cu, Ni and Co, have been refined from X-ray (CuK a ) powder diffraction data by means of Rietveld analyses in space group . The Fe and Me ions are octahedrally coordinated by C and N atoms respectively, forming three-dimensional bimetallic networks with…
Luminescence of Mn2+ in A sites in natural and synthetic MgAl2O4 spinel has been studied. In the near perfect structure of the natural crystals the degenerate levels of the Mn2+ are splitted due to a symmetry lower than tetrahedral. In synthetic crystals the structure of the spectra is lost as a consequence of the sup…
Spectroscopic properties of Ce3+ ions in GdAlO3 crystal are presented. At least three Ce3+ nonequivalent centres (multisites) are present in this crystal. Energy transfer from the Ce3+ main in the UV emitting centres to the Ce3+ green emitting centres is observed. Ce3+ fluorescence decays are either fast (1.5–20 ns) o…
The synthesis of diamond has been accomplished from carbon disulfide (CS 2 ) in hydrogen (H 2 ) using tungsten hot filament chemical vapor deposition. A continuous layer was deposited on silicon and characterized using Raman spectroscopy, X‐ray diffraction (XRD), and scanning electron microscopy. The polycrystalline f…
The dispersive refractive index n(λ) and thickness d of chalcogenide glass thin films are usually calculated from measurements of both optical transmission and wavelength values. Many factors can influence the transmission values, leading to large errors in the values obtained for n(λ) and d. Anovel optical method is…
A new failure mode in ferroelectric, non-volatile memories in a radiation environment has been identified. Exposure to ionizing radiation in combination with a series of unipolar pulses, which could be found in a read-only or read-mostly memory application, has been found to create a preferred memory state in the ferr…
ISHS International Seminar on Soilless Culture Technology Protected Crops Mild Winter Climates GRANULOMETRIC ALTERATION, AIR-ENTRY POTENTIAL AND HYDRAULIC CONDUCTIVITY IN PERLITES USED IN SOILLESS CULTURES