Materials Literature
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Summary Jarring implies heavy loads on the drillstring. The highest load on the drillpipe before jarring is at the rig floor. This paper discusses loads on drillpipe before, under, and after jarring. We show that for most situations, the shock wave from the jar impact does not imply additional load on the drillpipe co…
Article Magnesium-Gadolinium and Magnesium - Gadolinium- Yttrium Alloys / Magnesium-Gadolinium- und Magnesium-Gadolinium — Yttrium Legierungen was published on December 1, 1994 in the journal International Journal of Materials Research (volume 85, issue 12).
Abstract 125 Te nuclear spin relaxation (NSR) and electrical conductivity measurements were performed on ultrapure single-crystalline paratellurite (α -TeO 2 ) between about 50 K and the melting point (1007 K) at various oxygen partial pressures (1 bar -10 -4 bar). At elevated temperatures the NSR rate 1 / T 1 and con…
Abstract Sterically overcrowded unsymmetrical porphyrins bearing ten and eleven phenyl groups are synthesized using mixed condensation of diphenylpyrrole with benzaldehyde and formaldehyde and characterized by FAB-MS, UV-VIS, and NMR spectra.
We have grown powders and ceramics of Lead Titanate (PbTiO3) doped with Lanthanum and Copper. The incorporation of Cu ions does not change the lattice properties of PbTiO3: La. On the other hand, we demonstrate that the conductivity properties of PbTiO3: La, Cu may be swept over 12 orders of magnitude.
Diamond film thermistors were fabricated from polycrystalline diamond films grown on sintered Si3N4 by microwave plasma chemical vapor deposition. An undoped diamond layer and a zigzag or rectangular pattern of B-doped semiconducting diamond were successively deposited by a selected-area deposition technique. For ohmi…
The hysteresis behaviour of the nematic-cholesteric phase transition in liquid crystals is closely connected with the alignment of the liquid crystal molecules on the surfaces of treated solid substrates. We have investigated the hysteresis as a function of rubbing strength, using rubbing technology that controls the…
Abstract The effect of end conditions and testing procedures on the measured strength of 100- by 200-mm (4- by 8-in.) concrete cylinders were evaluated. Concretes representing three strength levels: 50, 75, and 120 MPa (7000, 11 000, and 17 000 psi) were prepared. Cylinder end conditions included grinding and capping…
It has been revealed that a concentrated chloroform solution of poly(2,5-dinonyloxy- p -phenylenevinylene) (NO-PPV) can be in a lyotropic liquid crystalline state at room temperature. The lyotropic NO-PPV solution exhibits redshift of optical absorption compared with the isotropic solution. X-ray diffraction analysis…
The decagonal phase in the Al-Co-Ni system transforms at lower temperatures into a crystalline approximate phase. Intermediate states between these equilibrium phases with complex domain structures are frozen in during experimental crystal preparation. The implications of the experimental difficulties in preserving we…
A simple and reliable method has been developed for the in situ LR White embedding of cell monolayers grown on glass cover-slips. Combined with cytochemical or immunological procedures, this technique allows light and/or electron microscopy investigations of a large number of cells in the same horizontal plane within…
Abstract Polyurethane adhesives containing the polyether backbone exhibit a good joint strength in cryogenic environments. In practice, many of the commercially available polyurethane adhesive systems contain free or chemically blocked isocyanates which have some limitations. This study presents the synthesis and char…
Complexes of the types R 3 Pb-Fe(CO) 2 Cp [R=Me (a). Et (1b), i Pr (lc), i Bu (Id)]. R 2 Pb[Fe(CO) 2 Cp] 2 [R=Me (2a), Et (2b)], i Pr 2 (Br)Pb-Fe(CO) 2 Cp (3c) and [R 2 PbFe(CO) 4 ] 2 [R=Me (4a), Et (4b). i Pr (4c)], as well as the spiro-complexes Pb[Fe(CO) 4 PbR 2 ] 2 [R = Me (5a). Et (5b). i Pr (5c)] and Pb[Fe(CO) 4…
Surface segregation in thin films of model symmetric polyolefin diblock copolymers exhibiting a lamellar morphology has been investigated. Films were spin coated on a variety of substrates and the resulting microstructure analyzed using neutron reflection, X-ray reflection, ellipsometry, light microscopy and secondary…
The mechanism and nature of radiation defects creating with electron and neutron irradiation in LTB crystals are discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of the Tributyltin-Iron(III) Porphyrin Complex by a Free Radical ProcessByungho Song and Harold M. GoffCite this: Inorg. Chem. 1994, 33, 26, 5979–5980Publication Date (Print):December 1, 1994Publication History Published online1 May 2002Published inissue 1 December…
Effects of chromium (Cr) and molybdenum (Mo) on differences in corrosion behavior of ferritic and austenitic stainless steels (SS) were investigated to clarify the reason for the superior corrosion resistance of high-alloy ferritic SS to austenitic SS. In the region where the corrosion index (Cr + 3xMo [mass%]) exceed…
Abstract Explains the origins of the development of the handle method, and lists the three criteria for predicting fabric quality. Shows how fabric handle evaluation is used, for example, handle analysis expresses characteristics and quality. Goes on to explain hand value and total hand value with the aid of equations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and X-ray Crystal Structure of a Novel Iron Nitrosyl Complex, Fe(NO)2PPh3(.eta.2-TCNE)Lijuan Li, Gary D. Enright, and Keith F. PrestonCite this: Organometallics 1994, 13, 12, 4686–4688Publication Date (Print):December 1, 1994Publication History Published online1 Ma…
Two novel dinuclear complexes of terbium(III) with 1,5-bis(1′-phenyl-3′-methyl-5′-pyrazolone-4′)-1,5-pentanedione (H2L), Tb2L3·6H2), Tb2L3·SDMF, have been synthesized. The crystal structure of Tb2L3 · 5DMF was determined by X-ray diffraction methods. Crystals are triclinic, space group P 1 with α = 16.957(5), b = 17.8…