Double exchange in iron-sulfur clusters and a proposed spin-dependent transfer mechanism
Abstract
Materials Literature
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Improving adhesion of wood fiber with polystyrene by the chemical treatment of fiber with a coupling agent and the influence on the mechanical properties of composites
—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…
Computer Calculation of Water-Clay Interactions Using Atomic Pair Potentials
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…
Calcium and Sulfate Retention by Two Oxisols of the Brazilian Cerrado
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…
One-Dimensional Transient Fluid Model for Fuel/Coolant Interaction Analysis
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…
Calcification in echinoderms
info:eu-repo/semantics/published
Effect of chemical treatment of fibers on the mechanical properties of polyethylene-wood fiber composites
—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…
Fracture Mechanics: Perspectives and Directions (Twentieth Symposium)
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…
Environmental Aspects of Stabilization and Solidification of Hazardous and Radioactive Wastes
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…
Infrared study of the thermal decomposition of heteropolyacids of the series H3+xPMo12–xVxO40
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…
Nickel Complexes Containing Sterically Demanding Thiolate Ligands: [Ni8S(SC4H9)9]⊖, a Mixed‐Valence Nickel Sulfide Thiolate Cluster, and [Ni4(SC3H7)8], a Homoleptic Nickel Thiolate
A sulfide ion at the center of an Ni6 prism capped by two additional Ni atoms, and the presence of nine μ2-StBu bridges are the characteristic features of the structure of 1. The mean oxidation state for nickel in diamagnetic 1 is + 1.25. The anion 1 is the first pure nickel–sulfur complex with nickel in an unusual ox…
Mechanism of Grain Orientation During Hot‐Pressing of Bismuth Titanate
Grain‐oriented Bi 4 Ti 3 O 12 ceramics have been prepared by hot‐pressing. Platelike grains align during hot‐pressing; the long‐axis direction perpendicular to the crystal c axis is oriented perpendicular to the pressing direction. The effects of hotpressing conditions such as temperature, pressure, time, and type of…
Reactions of heteropolyanions in non-polar solvents. Part 3. Activation of dioxygen by manganese(II) centres in polytungstates. Oxidation of hindered phenols
The heteropolyanions [XW11O39{MnII(OH2)}]n–[X = P(1), Si (2), Ge (3), or B (4)] and α2-[P2W17O61{MnII(OH2)}]8–(5) have been transferred into non-polar solvents (benzene, toluene) with the aid of tetraheptylammonium bromide or other phase-transfer agents. Following dehydration of their non-polar solutions, anions (2) a…
Characterization of the mixed perovskite BaSn1–xSbxO3 by electrolyte electroreflectance, diffuse reflectance, and X-ray photoelectron spectroscopy
The band gap of the mixed perovskite BaSn1–xSbxO3 has been reported to be 134 kJ mol–1(J-M. Hermann, M. R. Nunes and F. M. A. da Costa, J. Chem. Soc., Faraday Trans. I, 1982, 78, 1983), corresponding to 1.4 eV, which is the optimum value for solar-energy conversion. In order to confirm this value, pressed discs of the…
Microstructure and Corrosion Studies for Optimized PWR and BWR Zircaloy Cladding
The increased discharge burnups envisaged today require an optimization of the Zircaloy cladding properties with regard to corrosion with different strategies for optimizing the corrosion for boiling water reactor (BWR) and pressure water reactor (PWR) applications. A broad laboratory study showed that the influence o…
Spatial and temporal trends of diatom flux in British Columbian fjords
The monthly flux of diatom taxa at four sites in two fjords of British Columbia, Canada, was determined over a 3-year period by particle interceptor traps. Saanich Inlet is a small basin with little horizontal density gradient while Jervis Inlet experiences seasonal runoff and strong vertical stratification. The basic…
Al-doped Nd-Fe-B permanent magnets: wetting and microstructural investigations
The coercivity of Nd-Fe-B sintered magnets has been improved by Al additions. To study the microstructural effect of Al addition, two types of investigation were formed: (1) the change in the wetting behavior of the liquid phase, at the sintering temperature, was studied by measurements of the wetting angle; and (2) t…
Hot-working behavior of cast Pr-Fe-B magnets
The hot working is done at a low strain rate (hot pressing) and a high strain rate (hot rolling). Magnetic alignment induced by the hot working is found to be closely related to the microstructure of the cast ingots and the direction of principal stress. The appropriate structure is a columnar structure. The c-axis of…
Synthesis of Amorphous Boron Nitride by Pressure Pyrolysis of Borazine
Amorphous BN that contains hydrogen could be synthesized by pressure pyrolysis of borazine below 700°C at 100 MPa. The fraction of B and N bonded to H in the pyrolysis product could be controlled by changing the pressure pyrolysis condition. The pyrolysis product at 700°C and 100 MPa showed formation of B‐N‐B bonds of…
Spin crossover in chromium(II) complexes and the crystal and molecular structure of the high spin form of bis[1,2-bis(diethylphosphino)ethane]di-iodochromium(II)
From the variation of magnetic properties with temperature trans-bis[1,2-bis(diethylphosphino)ethane]-di-iodochromium(II) undergoes a sharp S= 2 to S= 1 spin-state transition between 165 and 175 K.