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Occurrence and genesis of palygorskite and associated clay minerals in a Pleistocene calcrete complex, Sde Boqer, Negev Desert, Israel
Abstract Palygorskite and associated clay minerals have been studied in a Pleistocene calcrete complex from the Negev desert (Sde Boqer, Israel). This complex is divided into five main parts: the chalky and marly bedrock overlain by its weathered product, a brecciated calcrete hardpan; the laminar crust; loess pockets…
Phonon density of states of nanocrystalline Fe prepared by high-energy ball milling
We performed inelastic neutron scattering measurements on nanophase Fe powders prepared by high-energy ball milling. Neutron energy loss spectra were measured for two states of the material: (1) as milled, when the material had a characteristic nanocrystallite size of 12 nm; and (2) annealed, when the material had a c…
Porcelainized stoneware: architectural, processing and physico-mechanical properties
Porcelainized stoneware is an extremely hard and homogeneous unglazed ceramic material obtained by fastfiring of kaolinitic ceramic bodies containing a large amount of fluxes. The obtained tiles, available in a large variety of colours, shape size and surface finish, are characterized by very low porosity (<0,3wt% exp…
Characterization of fibers as rockwool for insulation obtained from canary islands basalts
Glass fibers in the shape of wool were obtained at laboratory scale from three samples of basaltic rocks from the Tenerife Island. The rockwool is widely used as thermal and acoustical insulation. The ability of these rocks to be fiberized was studied by means of the viscosity curves and can be quite improved by addin…
Conceptual framework for the thermal process modelling of fused deposition
Explains the fused deposition process and examines the rationale behind the cooling process model. Outlines the complexity of the problems and characteristics of fused deposition. Presents a general formulation for road cooling followed by results and their implications. Concludes with proposed directions for future w…
A portable fracture toughness tester for biological materials
A portable mechanical tester is described which is both lightweight and cheap to produce. The machine is simple and convenient to operate and requires only a minimum of personnel training. It can be used to measure the fundamental mechanical properties of pliant solids, particularly toughness (in the sense of `work of…
Solvation of complex molecules in a polar liquid: An integral equation theory
A statistical mechanical integral equation theory is developed to describe the average structure of a polar liquid around a complex molecular solute of irregular shape. The integral equation is formulated in three-dimensional Cartesian coordinates from the hypernetted chain (HNC) equation for a solute at infinite dilu…
Anti-Inflammatory and Analgesic Activity ofBaccharis trimera: Identification of its Active Constituents
The butanolic fraction (BT-II) derived from the aqueous crude extract was prepared from aerial parts of Baccharis trimera and assessed in anti-inflammatory, analgesia, and ulcerogenesis models. Intraperitoneal pretreatment with lyophilized BT-II, at doses ranging from 40 to 100 mg/kg, markedly inhibited carrageenan- a…
Tungsten as target material in fusion devices
Several experiments were conducted in ASDEX Upgrade to prove the suitability of tungsten as a divertor target material under the conditions of a high density and low temperature divertor. The observed fluxes from a tungsten tile into the plasma are low, in keeping with the extremely low sputtering yields. In addition,…
A UNIFIED THERMODYNAMIC CONSTITUTIVE MODEL FOR SMA AND FINITE ELEMENT ANALYSIS OF ACTIVE METAL MATRIX COMPOSITES
SUMMARY A unified thermodynamic constitutive model for Shape Memory Alloy (SMA) materials, based on the thermodynamic framework proposed by Boyd and Lagoudas,1is presented in this paper. The specific selections for the form of Gibbs free energy associated with the martensitic volume fraction are identified for several…
Spall fracture properties of aluminum and magnesium at high temperatures
Measurements of the dynamic tensile strength of aluminum and magnesium have been carried out by investigations of the spall phenomena over a wide range of temperatures, shock-wave intensities, and load durations. Free-surface velocity profiles were recorded with VISAR and used to provide the spall strength measurement…
Homogeneous synthesis of cellulose p‐toluenesulfonates in N,N‐dimethylacetamide/LiCl solvent system
Abstract Pure cellulose p‐toluenesulfonates (tosylates) with an insignificant formation of chlorodeoxy groups were prepared by reacting cellulose dissolved in a solution of N,N‐dimethylacetamide and LiCI with tosylchloride (Tos‐CI) in the presence of triethylamine within 24 h at 8°C. Various cellulosic starting materi…
Photoelectron imaging spectrometry: Principle and inversion method
A new photoelectron spectrometer has recently been used to analyze the energy and spatial distribution of photoelectrons produced by multiphoton ionization of rare gases. It is based on the analysis of the image obtained by projecting the expanding electron cloud resulting from the ionization process onto a two-dimens…
Interphase and compatibilization of polymer blends
Abstract Polymer blends are mixtures of at least two polymers and/or copolymers comprising more than 2 wt% of each macromolecular component. Most blends are immiscible, and need to be compatibilized. The compatibilization must not only ensure improvement in performance, but it must be reproducible, insensitive to form…
A unified thermodynamic constitutive model for SMA and finite element analysis of active metal matrix composites
SUMMARY A unified thermodynamic constitutive model for Shape Memory Alloy (SMA) materials, based on the thermodynamic framework proposed by Boyd and Lagoudas,1is presented in this paper. The specific selections for the form of Gibbs free energy associated with the martensitic volume fraction are identified for several…
Using phase transitions to investigate the effect of salts on protein interactions
We have investigated liquid-liquid and solid-liquid phase separation of aqueous solutions of lysozyme. We have determined experimentally how the phase transition temperatures depend on protein concentration and the ionic composition of the solution. For a wide range of solution conditions, we find that the cloud-point…
Columnar mesophases of alkylated hexa‐ peri ‐hexabenzocoronenes with remarkably large phase widths
Polyaromatic hydrocarbons are model compounds for graphite and have interesting electronic and optoelectronic properties. The synthesis and preliminary characterization of hexaalkyl‐substituted hexa‐ peri ‐hexabenzocoronenes (see figure) are described. It is shown that they exhibit hexagonal columnar mesophases with r…