Materials Literature
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A study was conducted to determine the effect of slope terracing on soil quality in some oil palm plantations in Peninsular Malaysia. Samples from three different deep terraced-saprolitic profiles of varying depth and geology were collected and analysed for their physicochemical properties and chemical fertility chara…
Molecular dynamics simulations were carried out on several linear alkane systems of different chain lengths, confined between hydroxylated α-aluminum oxide surfaces at experimental densities, to study structural and dynamical features of the film/surface interfaces. The simulations show that there is extensive multila…
Abstract A microporous silica gel was prepared by a sol-gel process in the presence of ethylene glycol (EG) and its oligomers (oligoEG), and the pore formation process was investigated by using NMR and TG-DTA. The micropore volume changed with the polymerization degree of oligoEG, and showed a minimum at the trimer of…
The picture of a grain boundary as a periodic array of dislocations implies the occurrence of phonon scattering processes that the Klemens theory of thermal conductivity does not account for. A grain boundary works similar to a diffraction grating, producing diffraction spectra of various orders: each order number n i…
A semi-implicit formulation of Tate-independent classical plasticity, as implemented in a three dimensional continuum mechanics code is discussed.The plasticity formulaijon employs an associative flow de fo7 the evo.hdion of plastic sih'sin, an anisotropic yield criterion, an application of Nemat-Nasser 's semi-implic…
The radioactive isotope 32Si was used to measure Si uptake during a spring bloom dominated by the diatom Thalassiosira nordenskioeldii. The diatoms converted virtually all dissolved silicic acid in the surface layer into biogenic silica. The rate of Si uptake was unsaturated in all the experiments conducted during the…
The one-particle models of crystal-field theory provide a qualitative interpretation for the observed ground state splitting of four Kramers doublets of the 8S7/2 of Bk4+ doped into CeF4. A set of nine nonzero (Bqk) parameters corresponding a C2v point symmetry provide a very good correlation between the experimental…
Glass slides were chemically etched with sulfuric acid using five different methods. We investigated the effects of chemical etching condition on such properties as chemical composition, surface roughness, and thermal stability of the glass. Sodium and carbon atoms on the surface of the glass are effectively eliminate…
Abstract The photoreduction processes of α-[PMo12O40]3- (α-PMo12(0)) in aqueous solutions at pH 2.0 are discussed on the basis of the results of the electrical conductivities and 31P NMR spectra of photolytes, and the crystal structures of α-type two-electron and β-type four-electron reduction species isolated from ph…
Thin carbon–nitrogen films (i.e., CNx) have been obtained by dual ion beam sputtering. The chemical composition and the type of bonding of the CNx material have been examined, as a function of the deposition parameters, by Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy (XPS), and electron en…
Poly(furfuryl alcohol) with different amounts of oxymethylenic bridges was synthesized using trifluoroacetic and p-toluenesulfonic acid. All polymers displayed a tendency to retain acids. The isolated products containing traces of acid became insoluble in a few hours; while neutral material maintains their solubility…
The experimental results reported in this paper mainly concern the two first transient pressure waves emitted after a fast (approximately ns) and localized (approximately micron) injection of electrical energy Wi in insulating liquids. The influence of various parameters (hydrostatic pressure P infinity, injected ener…
Abstract Two new types of solid siloxane additives for plastics are described which give improved benefits compared to previous silicone additives. Ultra‐high‐molecular‐weight (UHMW) siloxanes are used in the new additives; traditional silicone plastic additives have used much lower molecular‐weight silicones. The sil…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLuminescent Rare-Earth Multilayer Chelates from Segmented Poly(urethane ureas)J. K. Mwaura, D. L. Thomsen, T. Phely-Bobin, M. Taher, S. Theodoropulos, and F. PapadimitrakopoulosView Author Information Nanomaterials Optoelectronics Laboratory Department of Chemistry, Po…
This paper describes the processing results of TiAl alloys melted in a controlled atmosphere induction furnace, using crucibles made of graphite, calcia and zirconia stabilized with yttria, calcia and magnesia. Samples were poured into graphite permanent moulds or solidified and cooled inside the crucible, in order to…
Exposure of rubbing polyimide (PI) film to depolarized ultraviolet (UV) light suppressed the effective anchoring energy of liquid crystal (LC) with aligning surface. Polarized light changed the orientational distribution of PI molecules obtained by rubbing by changing both the anchoring energy and easy axis direction.…
We have demonstrated two-stage optical memory in a photoaddressable azo polymer. The polymer serves as a data storage medium with two recording mechanisms: photoanisotropic modulation and surface-shape modulation. We can select the recording mechanism by manipulating beam energies for recording. The characteristics ca…
Using the sol–gel spin-coating method, La0.67Sr0.33MnO3 and La0.7Ca0.3MnO3 polycrystalline films have been prepared. The polycrystalline films show much lower resistivity peak temperature Tp than that of the corresponding epitaxial film, and Tp shifts to higher temperature when the annealing temperature increases. The…
The prediction of iodine behavior in the containment of a pressurized water reactor following a loss-of-coolant accident requires a reliable model of the chemistry of iodine in aqueous solution. The INSPECT model, which has been developed over several years, contains a large number of the relevant chemical reactions o…
Poly(hydrogenmethylsiloxane-co-dimethylsiloxane)s of various compositions have been prepared by cationic ring-opening polymerization of octamethylcyclotetrasiloxane (D4) and 1,3,5,7-tetramethylcyclotetrasiloxane (D) in the presence of hexamethyldisiloxane as end-blocker or by rearrangement of poly(hydrogenmethylsiloxa…