Microstructural Basis of Selection of Materials and Mix Proportions for High-Strength Concrete
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Manganese( II ) and iron( III ) complexes of the tridentate ligands bis(benzimidazol-2-ylmethyl)-amine (L 1 ) and -methylamine (L 2 ). Crystal structures of [MnL 1 (CH 3 CO 2 ) 2 ], [FeL 2 Cl 3 ], and [Fe 2 L 1 2 (µ-O){µ-(CH 3 ) 3 CCO 2 } 2 ][ClO 4 ] 2
The preparation and characterisation of [MnL1(CH3CO2)2](1), [Mn6(µ4-O)2(C6H5CO2)10(H2O)4](9), [FeL1Cl3](10), [FeL2Cl3](2), and [Fe2L12(µ-O){µ-(CH3)3CCO2}2][ClO4]2(3) are reported where L1 and L2 are bis(benzimidazol-2-ylmethyl)amine and bis(benzimidazol-2-ylmethyl)methylamine. The molecular structures of (1), (2), and…
Darstellung und Kristallstruktur der Pnictidoxide Na2Ti2As2O und Na2Ti2Sb2O
Abstract Durch Umsetzung von Na 2 O und TiAs bzw. TiSb in verschweißten Tantalampullen unter Argon gelang die Darstellung der metallisch grauen und sehr hydrolyseempfindlichen Verbindungen Na 2 Ti 2 As 2 O bzw. Na 2 Ti 2 Sb 2 O. Sie kristallisieren tetragonal innenzentriert in einem modifizierten anti‐K 2 NiF 4 ‐Typ […
An equivalent circuit approach to analysis of synchronous machines with saliency and saturation
An equivalent circuit approach is presented for synchronous machine analysis. The approach provides a detailed treatment of magnetic nonlinearity without excessive computational complexity. The number of parameters is typically in the range of 30 to 100, in contrast with 13 to 19 in conventional linear models and with…
Halloysite- a critical assessment.
Water enters the interlayer space in halloysite to minimize cation-cation Coulomb repulsion between adjacent layer surfaces and to coordinate exchangeable cations postulated as present to compensate for Al(IV). The layers roll into tubes due to lateral misfit between a larger tetrahedral sheet and a smaller octahedral…
ATLAS : A Suite of Programs for the Analysis of Time-of-flight Neutron Diffraction Data from Liquid and Amorphous Samples
Abstract. A description is given of a suite of computer programs recently developed at ISIS for the analysis of time-of-flight neutron diffraction data from non-crystalline samples. The various stages of the analysis are discussed, giving particular emphasis to those aspects in which the analysis of time-of-flight dif…
Hard magnetic phase in rapidly quenched Zr-Co-B alloys
In order to identify a hard magnetic phase in rapidly quenched Zr-Co-B alloys and clarify its magnetic properties, Zr-Co-B ribbons, Zr-Co ribbons, and Zr-Co ingots were studied. The hard magnetic phase is interpreted as a Zr/sub 2/Co/sub 11/ intermetallic compound. This compound has a Curie temperature of 500 degrees…
Introduction to Aluminum and Aluminum Alloys
Abstract Aluminum, the second most plentiful metallic element, is an economic competitor in various applications owing to its appearance, light weight, fabricability, physical properties, mechanical properties, and corrosion resistance. This article discusses the primary and secondary production of aluminum and classi…
Crystallinity indexes of cellulosic materials.
A simple X-ray diffraction method for the measurement of crystallinity of cellulose was investigated. Principle of the method lies on the analysis of X-ray diffractograms of crystalline cellulose I or II mixed with varying amount of stable amorphous cellulose prepared from anhydro sulfurous acid-diethylamaine-dimethyl…
Method of three-dimensional network solution of leakage field of three-phase transformers
A fast, handy method of assessment of a three-dimensional leakage field distribution and hot-spot localization in three-phase power transformers is proposed. The computational model is based on the reluctance network method. A 3-D leakage field of a three-phase transformer is simulated with an equivalent reluctance of…
A general free volume-based theory for the diffusion of large molecules in amorphous polymers above the glass temperature. I. Application to di-n-alkyl phthalates in PVC
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA general free volume-based theory for the diffusion of large molecules in amorphous polymers above the glass temperature. I. Application to di-n-alkyl phthalates in PVCKenneth A. Mauritz, Robson F. Storey, and Scott E. GeorgeCite this: Macromolecules 1990, 23, 2, 441–450Pub…
The Role of Triplet State of Nitrospiropyran in Their Photochromic Reaction
Abstract The effects of intermolecular and intramolecular triplet quenchers and sensitizers on the photochromism of nitrospiropyran have been examined in order to clarify the role of the triplet state (3A*) as well as that of the excited singlet state (1A*). The rates of photocoloration and fatigue were significantly…
Phase relations and magnetic properties of new phases in the Fe-Nd-Al and Fe-Nd-C systems and their influence on magnets
The drastic increase in coercivity observed after adding Al in Fe-Nd-B-based magnet alloys seems to originate partially from the occurrence of new Al-stabilized phases in the grain boundary region and at the surface of the Fe/sub 14/Nd/sub 2/B grains. To describe these phases, they were synthesized and their propertie…
Fischer-Tropsch synthesis: carbon-14 tracer study of alkene incorporation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFischer-Tropsch synthesis: carbon-14 tracer study of alkene incorporationLi Min Tau, Hossein A. Dabbagh, and Burtron H. DavisCite this: Energy Fuels 1990, 4, 1, 94–99Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 Jan…
Calculation of DC and AC flashover voltage of polluted insulators
The phenomena and the propagation processes of DC and AC arcs on the surface of polluted insulators were observed and investigated by means of a high-speed camera. Time-resolved photographs indicate that there is an obvious distinction between DC and AC flashover processes. Based on the alternating character of an AC…
Estimation of fast transient overvoltage in gas-insulated substation
The authors measured FTO (fast transient overvoltages) at various points of a commercial 550 kV gas-insulated substation (GIS) by operating energized disconnectors. Based on the results of these measurements, the possible levels of FTO at various points of the GIS and the probability of occurrence of large levels are…
Synthesis of metal colloids in inverse microemulsions
Colloidal silver and gold particles have been prepared by reduction of aqueous metal salt solutions in inverse microemulsions. The sols are characterized by absorption spectroscopy and electron microscopy. Ultrasound treatment during reduction results in a narrower size distribution of the colloidal particles, as evid…
A low-pressure guerbet reaction over magnesium oxide catalyst
Propan-1-ol and 2-methylpropan-1-ol were synthesized selectively by the catalytic reaction of methanol and ethanol over magnesium oxide.
The effect of steady flow fields on the isotropic–nematic phase transition of rigid rod-like polymers
In this paper we study the stability of steady state solutions to Doi’s kinetic equation for rigid rod-like polymers in an arbitrary flow field. It is found that for a certain range of concentration, the addition of flow to an isotropic phase can induce a transition to the nematic phase, if the flow rate exceeds a cer…
Structural analysis of orthorhombic ZrO2 by high resolution neutron powder diffraction.
A time-of-flight neutron diffraction experiment was undertaken on a powder sample of orthorhombic ZrO2 synthesized at 600°C and 6GPa for 30min. The Rietveld analysis for the diffraction data shows that the space group of this phase is Pbca. The refined lattice parameters are a0=1.00861, b0=0.52615, and c0=0.50910nm.