Materials Literature
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Abstract. The behaviour of potassium (K) in a range of arable soils was examined by plotting the change in exchangeable K of the topsoil (Δ K ex ) at the end of a 3–5 year period against the K balance over the same period (fertilizer K applied minus offtake in crops, estimated from farmers' records of yield and straw…
Spallation neutron and high-energy X-ray diffraction experiments have been performed to investigate the local structural changes in triphenyl phosphite (TPP) in the crystalline, glacial, glassy, and supercooled liquid phases. The hydrogen/deuterium first-order difference method shows a large increase in intensity due…
Abstract This study was aimed at finding a correlation between the experienced off‐flavor in packed foods and the presence of specific degradation products in LDPE packaging films. The possibility to trap degradation products by chemical reactions with scavengers, i.e., a zeolite additive or antioxidants, was investig…
Abstract Non-metamict betafite, a pyrochlore-group mineral with general formula A 2− m B 2 X O 6 Y (O,OH,F) 1− n · p H 2 O and 2 Ti > Nb+Ta and U > 20% at the A site, has been found at Le Carcarelle, (Latium, Italy). It occurs within miarolitic cavities of a foid-bearing syenitic ejectum enclosed within the pyro…
A robust constitutive model is desirable in order to guide the processing and development of ferromagnetism and for use in the design of ferromagnetic devices. In this paper, a non-linear constitutive model of soft ferromagnets is developed for general magnetomechanical loading histories. The experimental set-up and m…
Crack propagation in bcc iron at different strain rates and temperatures has been studied by atomistic simulation and continuum mechanics. The results show that stacking-fault creation, or twin formation and movement, are accompanied by crack extension in brittle fracture. Moreover, it is found, from the analysis of s…
Solids containing Co(II) and Fe(III) with molar ratios of 2/1, 3/2, 1/1, 2/3 and 1/2 have been synthetised by coprecipitation at constant pH. All they displayed a hydrotalcite-like structure with interlayer carbonate, which crystallinity decreases as the iron content was increased. No other crystalline phase was ident…
Samples with the chemical formula MnGaxFe2-xO4 (x = 0.0, 0.1, 0.3, 0.5and 0.7) were prepared by the usual ceramic method. X-ray analysis revealedthe presence of single spinel phase. The lattice parameters as well as theporosity were found to decrease while the density and grain size were increasedwith increasing Ga co…
The influence of clay preparation methods on the sorption and hydrolysis of carbaryl (1-naphthyl, N-methyl carbamate) by K+-saturated reference smectite SWy-2 was studied. Four methods were utilized: (1) The reference (or specimen) clay used as received was K+-saturated (hereafter referred to as whole clay). (2) High-…
Electroless plating of nickel (or copper) was carried out on glass (or silicon) substrates that were previously surface modified by using plasma-polymerization and grafting processes, and then activated by immersion in a simple acidic PdCl2 solution. Three pretreatments based on the deposition of plasma-polymerized th…
High performance polymeric foams have experienced a growing demand in aerospace applications such as cryogenic insulation, flame-retardant panels and structural sub-components. The Next Generation Launch Technology (NGLT) program requires foams capable of retaining their structural integrity while providing insulating…
${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{17}{\mathrm{H}}_{5}$ is an interesting compound where isolated hexagons formed by the tetrahedral sites of the host metal lattice are filled with hydrogen atoms. A localized jump diffusion of hydrogen atoms in ${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{17}{\mathrm{H}}_{5}$ over the vertices of t…
Using molecular dynamics simulations we investigated the effect of aging on static and dynamic properties of supercooled Al2 O3 models at the temperatures of 2100 K and 5600 K . Simulations were done in the basic cube under periodic boundary conditions containing 3000 ions with Born-Mayer type pair potentials. We obta…
Effective complex piezoelectric and dielectric constants of disordered heterogeneous systems, such as statistical mixtures consisting of spheroidal particles of the same orientation but with random distribution in space, are studied. It is found for the first time that, in such systems, there exists giant piezoelectri…
The formation of inclusion complexes between methyl orange (MO) and β-cyclodextrin (β-CD) was studied extensively using UV-visible absorption spectroscopy. In neutral-to-basic media, where MO is an anion, two complexes of stoichiometries 1:1 and 1:2 (guest:host) are formed, as determined by principal components analys…
From June 2000 to June 2002, four sites on the mainstem of the Xiangxi River and one site on each of its major tributaries were sampled 16 times each for benthic algae. All total, 223 taxa (most to species and variety levels) were found (193 Bacillariophyta, 20 Chlorophyta, nine Cyanophyta and one Xanthophyta). The di…
Results from impedance spectroscopy measurements at temperatures between 400 and 1000°C, for single crystal and highly pure and dense polycrystalline α-Al2O3 samples with well-defined grain size, are compared with that from molecular dynamics calculation. Between 650 and 1000°C, the measured activation energy for cond…
Frequency- and temperature-dependent dielectric spectroscopy of a newly-synthesised AFLC compound in its planar orientation has been carried out in order to determine the different dielectric parameters and analyse the various modes of dielectric relaxation of the different phases. The compound is (S)-(+)-4′-(1-methyl…
Nous avons etudie l'aeschynite-(Y) et le polycrase-(Y) metamictes par diffraction X et par spectroscopie de Raman. Afin de retablir leur structure originelle, ces echantillons ont ete chauffes a divers paliers de temperature. Les temperatures 400, 500, 650, 800 et 1000°C semblent, d'apres les traces thermogravimetriqu…
The trypsin-like serine proteases comprise a structurally similar family of proteins with a wide diversity of biological functions. Members of this family play roles in digestion, hemostasis, immune responses, and cancer metastasis. Bovine trypsin is an archetypical member of this family that has been extensively char…