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The excited-state dynamics of the Tm3+ ions in a singly doped crystal of LiYF4 is analysed. The Stokes fluorescence processes are interpreted by taking into account the numerous coincidences between the fluorescences emitted by the Tm3+ ions and by considering two kinds of sites. The anti-Stokes fluorescence dynamics…
Description Advances in Thermoplastic Matrix Composites Materials Provides an overview of recent accomplishments in advanced aerospace thermoplastic composites. 18 pages cover these important issues: • Processing • Thermal and Mechanical Behavior • Delamination
From the crystallographical point of view, phyllotaxis can be identified with the study of spiral lattices. In this paper, we devote our attention to plane lattices of points. Through a conformal transformation, one gets a lattice of points aligned along a logarithmic spiral. Centuries ago, one recognized the central…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of various dialkyl phthalate plasticizers in PVCRobson F. Storey, Kenneth A. Mauritz, and B. Dwain CoxCite this: Macromolecules 1989, 22, 1, 289–294Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 198…
Polyhydroxybutyrate (PHB) can be used as an alternative polymer to polylactide-glycolides for drug carrier production. It is a linear homopolymer biosynthesized by various strains of bacteria by condensation of D(-)-B-hydroxybutyric acid and used as an energy and carbon source. PHB can be obtained by extraction from b…
Nd-Fe-B alloys can be rapidly solidified to produce a highly stable, magnetically isotropic powder which can be processed directly into either bonded magnets or, if not pressed, into anisotropic magnets with energy levels exceeding 40 MGOe. Current processing methods are briefly reviewed, as are some of the unique adv…
The effect of lateral fluorine substituents on the dielectric properties of a range of nematic liquid crystals is reported. Measurements of dipole moments and electric permittivities have been made and used to calculate Kirkwood correlation factors over a range of temperature. The results show that the extent and natu…
It has been tried to design and prepare SiC/C Functionally Gradient Material (FGM) accompanying compositional gradient from SiC to C, for developing thermal-barrier materials for space plane. Thermal stresses in SiC monolith and SiC/C⋅FGM were calculated, based on one-dimensional linear analysis for a cylindrical mode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen atom transfer chemistry of heteropolytungstate 'browns' in nonaqueous solventsKent Piepgrass and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 753–754Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1…
The co-ordinating properties of the ligand 3,5-bis(2-pyridyl)pyrazole (Hbpypz) are reported and complexes of general formulae [M(bpypz)]NO3·xH2O (M = CoII, NiII, CuII, ZnII, or CdII), [M(bpypz)] Cl·xH2O (M = MnII, CoII, NiII, or ZnII), and [M(bpypz)]Br·xH2O (M = CoII NiII or ZnII) are described. The crystal and molecu…
Abstract
—The mechanical properties of polystyrene filled with chemithermomechanical pulp and wood residues of softwood and hardwood species, which were precoated with phthalic anhydride and various polymers, e.g. polystyrene and PVC, have been investigated. The extent of improvement in the mechanical properties of the composi…
A B S T RA C T : Existing data on interatomic potentials have been used to study the interactions between an uncharged clay sheet and a water molecule. Calculations show that most of the clay surface is relatively hydrophobic, with binding energies for a water molecule in the range 1-0-4.5 kcal mo1-1 . There is, howev…
Abstract The ability of two representative oxisols from the Cerrado region of Brazil to adsorb Ca 2+ and SO 2‐ 4 , when in their natural acidic state, was determined by using dissolved CaCl 2 , K 2 SO 4 and CaSO 4 salts as adsorbates. Calcium adsorption from CaCl 2 and CaSO 4 was nearly linearly dependent on the equil…
A fuel/coolant interaction (FCI) is a phenomenon that may occur during a light water reactor severe accident when molten fuel comes into contact with residual water in-vessel or in the reactor containment. A new one-dimensional multifluid transient model, which currently has the capability of examining nonexplosive FC…
info:eu-repo/semantics/published
—Linear low-density polyethylene (LLDPE) was reinforced with chemithermomechanical (CTMP) aspen fiber, wood flour, and cellulose flour. Wood fibers were treated with isocyanate or a vinylsilane coupling agent to improve the adhesion between the fiber and polymer. Composites were made at different weight percentages of…
Description Provides overviews of the major developments in fracture mechanics and associated applications over the past 20 years, and highlights directions for future developments and applications. 6 major sections include: • Analytical Fracture Mechanics • Nonlinear and Time Dependent Fracture Mechanics • Microstruc…
Description STP 1033 provides a unique perspective on stabilization and solidification research as performed by the hazardous and radioactive waste communities. These papers are grouped into 4 sections: Processes; Regulatory Aspects and Testing Methods; Laboratory Evaluation; and Large Scale Evaluation or Demonstratio…
F.t.i.r. spectroscopy has been used for the study of dehydration of heteropolyacids (HPA) of the series H3+xPMo12–xVxO40 carried out in vacuo at 298–673 K and also for the study of ammonia sorption on the same samples. Pumping at room temperature results in the departure of water of crystallization; the protons, which…