Filamentary carbon deposits can form on a 20Cr/25Ni (mass%) steel in a gas of high carbon activity even when the oxygen potential is sufficiently high to oxidise (of the main alloy constituents) both chromium and iron. These filaments are catalysed by metallic nickel which remains unoxidised but exists as small 10nm particles within the porous oxide layer formed in the early stages of oxidation. The objective of the present work was to examine the re-deposition process when the initial deposit has been burned off. As in the previous work, carbon deposits were produced by exposure of specimens at 550°C to a gas mixture of CO2/1% CO/1000 vppmC2H4 at 1-atmosphere total pressure. Specimen examination was performed in a FEGSEM in sufficient detail that the specimen area could be relocated in subsequent examinations. Burn-off exposures were performed at 450°C in Ar/20% O2. It was found that after 51 minutes burn-off exposure, considerable loss of carbon had occurred but that re-deposition occurred during subsequent exposure to the high-carbon environment. In contrast, a 2-hour burn-off exposure resulted in no further significant formation of carbon filaments during subsequent exposures. This effect of catalyst deactivation is related to the oxide formed during the burn-off stage.

A previously unnamed Holocene volcanic cone is herein informally named Gabrielse cone. Gabrielse cone is a subaerial basaltic scoria cone that is one of the few subaerial volcanic features in the Tuya-Teslin area. The cone is approximately 400 m in diameter with a central crater approximately 30 m deep. It consists largely of unconsolidated basaltic scoria some of which show preserved fluidal shapes typical of subaerial bombs. To the northeast the scoria cone appears to be breached and remnants of a lava flow were observed. Mineral compositions as determined by scanning electron microscope-energy dispersive spectometer are consistent with other occurrences of alkali olivine basalts in the area.

A large and uniform dataset is used to find equations for the prediction of absolute spectral acceleration ordinates in Europe and adjacent areas, in terms of magnitude, source-distance and site geology. The dataset used is shown to be representative of European strong motion in terms of the attenuation of peak ground acceleration. The equations are recommended for use in the range of magnitudes from MS 4⋅0 to 7⋅5 and for source-distances of up to 200 km.

AbstractDas mit Butyl‐Li aus Cycloheptatrien‐tricarbonyl‐Fe gebildete Cycloheptatrienyl‐tricarbonyl‐Fe‐Komplexanion reagiert mit Metallcarbonylhalogeniden wie dimerem Bromotetracarbonyl‐Mn, Bromotricarbonyl‐THF‐Re und Chlorodicarbonyl‐Rh in THF zu den gemischten′Zweikernkomplexen (I).

Chemischer InformationsdienstVolume 3, Issue 11 Organoelement Compounds ChemInform Abstract: KRISTALL- UND MOLEKULARSTRUKTUR VON DIHYDRIDO-BIS-(DIAETHYLSILYL)-OKTACARBONYLDIWOLFRAM (W-W, W-SI) MIT HYDROGENVERBRUECKTER METALL-SILICIUM-BINDUNG M. J. BENNETT, M. J. BENNETTSearch for more papers by this authorK. A. SIMPSON, K. A. SIMPSONSearch for more papers by this author M. J. BENNETT, M. J. BENNETTSearch for more papers by this authorK. A. SIMPSON, K. A. SIMPSONSearch for more papers by this author First published: March 14, 1972 https://doi.org/10.1002/chin.197211366AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume3, Issue11March 14, 1972 RelatedInformation

AbstractDie Reaktion der Thioäther (I) mit dem Pd‐Komplex (II) liefert die cis‐Komplexe (III), bei denen abhängig von der Stellung des Restes R syn‐ und anti‐Isomere vorliegen.