Materials Literature
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Abstract Durch Reaktivierung der kurzlebigen Vanadiumkontakte mit Hexachlorcyclopentadien wird eine bessere Katalysatornutzung und damit eine größere Wirtschaftlichkeit bei der Herstellung von Äthylen/Propylen‐Copolymerisaten erzielt. Hexachlorcyclopentadien wirkt dadurch reaktivierend, daß es das bei der Umsetzung vo…
"Plastics as Corrosion-Resitant Materials." British Corrosion Journal, 2(2), p. 78
Sintered UO2 pellets irradiated at high temperature to a burnup of 2,700 MWD/T-UO2 were studied by replica electron microscopy. The as-irradiated pellet surfaces were covered by a thin layer easily soluble in dilute acid. This layer apparently was deposited as a sublimate during irradiation. The etched surfaces of the…
Technical Briefs A Lower Bound on Displacement Rates in Steady Creep A. C. Palmer A. C. Palmer Department of Mechanical Engineering, University of Liverpool, Liverpool, England Search for other works by this author on: This Site PubMed Google Scholar Author and Article Information A. C. Palmer Department of Mechanical…
A phenomenologic al constitutive equation has been developed to describe conventional stress-strain behaviors for several metallic and nonmetallic materials for strain rates up to 103 sec1. Ambient temperature behavior has been empirically related to strain rate in a com- mon manner for all materials investigated. The…
A simple and easy method for measuring the twist density in the yarn between the roller-nip and thread-guide of a ring spinning frame has been compared with the high speed photography technique and has been shown to be reliable. Measurements using the method have brought out the influence of such factors as doff-stage…
The modifications necessary to convert electron microscope specimen holders for use with field-ion microscope specimen tips are described. Microscopes having an immersion objective lens are most suitable, and a modified specimen holder constructed for one of these (Philips EM 200) was found to be particularly reliable…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
The creep ductilities of irradiated Hastelloy N at 650°C have been determined at several neutron exposures. Elevated-temperature irradiation embrittlement greatly reduces the stress-rupture strength as measured in postirradiation uniaxial stress tests. The reduction in ductility to values as low as 0.4% is due to an i…
A liquid-helium object stage for the electron microscope has been used to observe directly magnetic domains in CrBr3, an ionic ferromagnet with a Curie point of 36°K. Some of the contrast effects observed are typical of the magnetic-domain wall observations made by Lorentz microscopy on materials such as Co which are…
A method is suggested to detect directly the deionization margin angle and to prevent the commutation failure of an inverter. The deionization margin angle is detected by anode- cathode voltage of a valve and ac phase voltage. The method to prevent the commutation failure, namely the one to hold the critical deionizat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConductances of some uni-univalent electrolytes in adiponitrile at 25.degree.Paul G. Sears, Joseph A. Caruso, and Alexander I. PopovCite this: J. Phys. Chem. 1967, 71, 4, 905–909Publication Date (Print):March 1, 1967Publication History Published online1 May 2002Published ini…
Summary Gersdorffite belongs to space group P 2 1 3 in the cubic system with cell dimension a 5·6885 ± 0·0003 Å and four formula units per cell. The hk 0 data were measured from precession photographs obtained with Mo- Kα radiation. The structure was solved by Patterson methods and refined by least-squares techniques.…
Single crystals of BaZnFe6O11 (Zn Y) were grown by the flux technique. Chemical analysis showed the presence of some ferrous ions in most batches. A relation between the Curie temperature and the ferrous content could be established. The anisotropy in the specific resistivity was measured (20–260 Ω·cm in the basal pla…
Abstract The concentrations and the growth rates of high‐ and low‐melting type spherulites of trans ‐1,4‐polyisoprene were measured in the temperature range 39–49°C. It was shown that above about 40°C., the crystallization rate of trans ‐1,4‐polyisoprene is determined primarily by the radial growth rate of high‐meltin…
Abstract Some crystalline organic compounds containing a β‐naphthyl group stiffen rubbers considerably. This paper discusses the dynamic behavior of these systems when subjected to oscillatory strain of increasing amplitude. Modulus–strain amplitude plots similar to that in carbon black–natural rubber systems are obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction of epoxides. II. The lithium aluminum hydride and mixed hydride reduction of 3-methylcyclohexene oxideBruce Rickborn and Wallace E. Lamke IICite this: J. Org. Chem. 1967, 32, 3, 537–539Publication Date (Print):March 1, 1967Publication History Published online1 May…
To test the applicability of the phenomenological theory of linear viscoelasticity, stress relaxation and dynamic mechanical properties are measured on oriented nylon 66 fibers and compared with previously reported creep data. Although the three types of viscoelastic experiments are performed on slightly different sam…
The pse udobinary sys tems Ti02-1rO, and Sn02-lr02 we re studied by x-ray diffraction after treatm e nt at vari ous te mpe ratures in air. Their equilibrium ph ase di agrams we re similar, with no int erm edi ate phases detec ted in eithe r sys tem. Max imum so lid so lution of Ti02 occ urs with th e additi on of abou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of Asymmetric Silicon. Stereospecific Platinum-Catalyzed Hydrosilation of 1-Octene with Optically Active R3Si*HLeo H. Sommer, Keith W. Michael, and Hiroshi. FujimotoCite this: J. Am. Chem. Soc. 1967, 89, 6, 1519–1521Publication Date (Print):March 1, 1967Publi…