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  • 1
    Electronic Resource
    Electronic Resource
    Residual Stress Measurements in Mo/CuCrZr Tiles Using Neutron Diffraction (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 59 (Dec. 2008), p. 299-303 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In plasma facing components (PFC) for nuclear fusion reactors tungsten or carbon based tiles need to be cooled through a heat sink. The joint between the PFC and the heat sink can be realized using a brazing process through the employment of compliant layer of either a low yield material, like copper, or a high yield material, like molybdenum. Experimental verification of the induced stresses during the brazing process is of vital importance. Strains and residual stresses have been measured in Mo/CuCrZr brazed tiles using neutron diffraction. The strains and stresses were measured in Mo tile along the weld direction and at different distances from it. The experimental results are compared with Finite Element Simulations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.59.299.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    The New Materials Science Diffractometer STRESS-SPEC at FRM-II (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 211-216 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In response to the development of new materials and the application of materials andcomponents in new technologies the direct measurement, calculation and evaluation of textures andresidual stresses has gained worldwide significance in recent years. Non-destructive analysis forphase specific residual stresses and textures is only possible by means of diffraction methods. Inorder to cater for the development of these analytical techniques the new Materials ScienceDiffractometer STRESS-SPEC at FRM-II is designed to be equally applied to texture and residualstress analyses by virtue of its flexible configuration. The system compromises a highly flexiblemonochromator setup using three different monochromators: Ge (511), bent silicon (400) andpyrolitic graphite (PG). This range of monochromators and the possibility to vary the take-off anglesfrom 2θM = 35º to 110º allows wavelength adjustment such that measurements can be performedaround a scattering angle of 2θS ~ 90º. This is important in order to optimise neutron flux andresolution, especially for stress analysis on components, since the gauge volume element in that caseis cubic and large vertical divergences due to focusing monochromators do not affect the spatialresolution.The instrument is now available for routine operation and here we will present details of recentexperiments and instrument performance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.211.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of all Six Components of X-Ray Elastic Factors (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 225-229 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A method is presented by which all components of Fij(ϕ, ψ, hkl) belonging to the samemeasurement direction and reflection can be determined. The neutron measurements are to be donewith a single specimen, shaped as a cuboctahedron. An apparatus for producing a compressivestress state in the specimen is needed. It must be small enough to fit into the neutron goniometerand to allow movement of the goniometer to all Eulerian angles. Using this set-up the tensors F(ϕ,ψ, hkl) can be measured for any ϕ, ψ and (hkl)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.225.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Problems in the Averaging of Neutron Diffraction Stress Data from Round-Robin Campaigns (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 283-288 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In recent years the use of a special Bayesian approach on averaging ‘round-robin’ residualstress data has been implemented. This averaging approach is useful in that it copes with thesituation where systematic errors have occurred in one or more of the measurements and thusdiminishes the influence of these particular ‘wrong value’ outlier data points. The analyses not onlytake into account the measurand value, but also the uncertainties associated with each measurand. Itshould deal with data that may contain individual members with uncertainties larger than the statederror and assumes that the quoted error bar is only a lower bound on the uncertainty. This workshows what could happen when there is a ‘strong mismatch’ in uncertainties when averaging over alimited amount of data. It has been observed that in a case where there are few data points (forexample 5 or less), a strong bias can occur towards data points with a relatively small quoteduncertainty compared to other data points with larger quoted uncertainties. A ‘mismatch’ inuncertainty quotation can arise when averaging very good data with poorer data or when averagingwith data obtained from other measurement techniques. This effect is demonstrated in this work byusing fictitious data and also based on the example of real measurement data obtained by neutrondiffraction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.283.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of Microstructural Parameters on Macroscopic Residual Stress Analysis of Complex Materials by Neutron Diffraction Methods (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 571-572 (Mar. 2008), p. 39-44 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Mechanical and thermal treatments during the manufacturing process inevitably cause theaccumulation of residual stresses in parts consisting of materials with complex microstructures.Neutron diffraction is particularly well suited to determine residual stress distributions within thebulk of the component. Due to the nature of a diffraction experiment an inextricable mixture of typeI and II residual stresses is measured. The accumulation of type II stresses (microstresses) isstrongly related to the microstructure. The impact of changes in the microstructure on neutrondiffraction experiments has been investigated on Inconel 718 (IN718) samples
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.571-572.39.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanical Activation of Tetracalcium Phosphate (2004)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It was found that prolonged high-energy ball-milling of Hilgenstokite (tetracalcium phosphate, TTCP) resulted in a decrease in both particle and crystallite size, leading to a mechanical activation of the compound. This mechanically activated material demonstrated a high reactivity such that, in contrast to highly crystalline TTCP, a setting reaction with water to nanocrystalline hydroxyapatite (HA) and Ca(OH)2 could be achieved at 37°C. However, crystalline TTCP is practically unreactive at physiologic temperatures because of the formation of a thin HA layer on the particle surface preventing further reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.00311.x
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  • 7
    Electronic Resource
    Electronic Resource
    The valvula cerebelli of the spiny eel, Macrognathus aculeatus, receives primary lateral-line afferents from the rostrum of the upper jaw (1991)
    Springer
    Cell & tissue research 266 (1991), S. 285-293 
    Details
    ISSN: 1432-0878
    Keywords: Cerebellum ; Valvula ; Lateral-line system ; Mechanoreception ; Macrognathus aculeatus (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the spiny eel, Macrognathus aculeatus, anterodorsal and (to a lesser degree) anteroventral lateralline nerves project massively to the granular layer of the valvula cerebelli, throughout its rostrocaudal extent. The posterior lateral-line nerve terminates in the corpus cerebelli. Thus, valvula and corpus cerebelli are supplied with mechanosensory input of different peripheral origins. An analysis of the taxonomic distribution of experimentally determined primary lateral-line input to the three parts of the teleostean cerebellum reveals that the eminentia granularis always receives such input, and that the corpus cerebelli is the recipient of primary lateral-line input in many teleosts. The valvula, however, receives primary lateral-line afferents in only two examined species. In M. aculeatus, the massive lateral-line input to the valvula probably originates in mechanoreceptors located in the elongated rostrum of the upper jaw, a characteristic feature of mastacembeloid fishes. This projection to the valvula may therefore represent a unique specialization that arose with the evolution of the peculiar rostrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318184
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese von Metallkomplexen mit Bis(phenalenyl)imin-Liganden (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 1119-1124 
    Details
    ISSN: 0170-2041
    Keywords: Phenalenones, hydroxy- ; Bis(phenalenyl)imine ligands ; Acenaphthenequinones ; Roesleria hypogea, pigments of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Metal Complexes with Bis(phenalenyl)imine LigandsSynthesis of model pigments and their metal chelates with Zn, Co, Ni, and Mn (26a-d) are described. The former are obtained from 2,4-dihydro-4,9-dihydroxy-1,2,4-phenalenethione (14b) by connecting two molecules in a ninhydrin-like reaction with nitrogen to the ligand 8. These models confirm the structure of the zinc complex 2 isolated from the ascomyces Roesleria hypogea. Isolation of the rearranged ester 18 proves this compound to be an intermediate in the mechanism of the degradation process of phenalenetriones 14 to acenaphthoquinones 16.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1990199001203
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  • 9
    Electronic Resource
    Electronic Resource
    On the Behavior of 5,8-Bis(trimethylsilyl)cycloocta-1,3,6-triene in Cycloaddition Reactions and Subsequent Chemistry (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 1041-1050 
    Details
    ISSN: 1434-193X
    Keywords: Phosphaalkynes ; Cycloadditions ; Polycycles ; Cage compounds ; λ3-Phosphinines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -Phosphaalkynes 2 and electron-deficient alkynes 11 readily react in a [4 + 2] cycloaddition process with 5,8-bis(trimethylsilyl)cycloocta-1,3,6-triene (8) in its bicyclic form 10 to furnish regioselectively the tricyclodecadienes 12 and 13, respectively. The phosphorus-containing compounds 12 exhibit structural features which make them suitable for homo-Diels-Alder reactions with electron-deficient acetylenes. A single crystal structure analysis of the homo-Diels-Alder adduct 14b confirmed the structure and relative configuration of the phophatricyclodecadienes 12. In solution the tricyclodecadienes 13 are prone to facile cycloreversion yielding the phthalic esters 15 and the cyclobutene 16. The latter is rapidly converted into the corresponding 1,3-butadiene 18, which can be trapped in a Diels-Alder/phospha-ene/Diels-Alder tandem reaction sequence by phosphaalkyne 2a. The phosphatricyclodecadiene 12 is thermally more stable; loss of cyclobutene 16 only occurs under FVP conditions to afford the λ3-phosphinine 22.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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