排序方式: 共有51条查询结果,搜索用时 15 毫秒
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Alexopoulos T Allen C Anderson EW Areti H Banerjee S Beery PD Biswas NN Bujak A Carmony DD Carter T Cole P Choi Y De Bonte RJ Erwin AR Findeisen C Goshaw AT Gutay LJ Hirsch AS Hojvat C Kenney VP Lindsey CS LoSecco JM McMahon T McManus AP Morgan N Nelson KS Oh SH Piekarz J Porile NT Reeves D Scharenberg RP Stampke SR Stringfellow BC Thompson MA Turkot F Walker WD Wang CH Wesson DK 《Physical review letters》1990,64(9):991-994
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Lazarus EA Navratil GA Greenfield CM Strait EJ Austin ME Burrell KH Casper TA Baker DR DeBoo JC Doyle EJ Durst R Ferron JR Forest CB Gohil P Groebner RJ Heidbrink WW Hong R Houlberg WA Howald AW Hsieh C Hyatt AW Jackson GL Kim J Lao LL Lasnier CJ Leonard AW Lohr J La Haye RJ Maingi R Miller RL Murakami M Osborne TH Perkins LJ Petty CC Rettig CL Rhodes TL Rice BW Sabbagh SA Schissel DP Scoville JT Snider RT Staebler GM Stallard BW Stambaugh RD St John HE Stockdale RE Taylor PL Thomas DM 《Physical review letters》1996,77(13):2714-2717
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In this paper, the surface acoustic wave velocity results acquired from the inspection of specially manufactured and characterised alumina ceramic materials are presented. Ultrasonic velocity data of alumina-based ceramics in the range 60-100% theoretical density was generated utilising non-contacting laser-ultrasonic measurements based on laser generation and detection of surface acoustic waves with the objective of creating a routine technique for industrial advanced alumina inspection. With linear fitting the surface acoustic wave velocity data serves as a calibration graph for using laser ultrasonics for routine monitoring of alumina. A second laser ultrasonic technique based on the laser generation and foil transducer detection of surface acoustic waves was used to validate the surface acoustic wave velocities measured by the laser generation/detection technique. 相似文献
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We classify the maximal irreducible periodic subgroups of PGL(q,
), where
is a field of positive characteristic p transcendental over its prime subfield, q = p is prime, and
× has an element of order q. That is, we construct a list of irreducible subgroups G of GL(q,
) containing the centre
×1
q
of GL(q,
), such that G/
×1
q
is a maximal periodic subgroup of PGL(q,
), and if H is another group of this kind then H is GL(q,
)-conjugate to a group in the list. We give criteria for determining when two listed groups are conjugate, and show that a
maximal irreducible periodic subgroup of PGL(q,
) is self-normalising.
相似文献
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Ellen Matthaei-Schulz Tony Flaherty Colm Flannery Tony Randles Odile Lefeuvre Pavel Zinin Laurent Robert 《Mikrochimica acta》2000,133(1-4):11-15
For quantitative assessment of the properties of hard coatings there is an increasing demand for testing methods with high
reliability of the test results, especially concerning the independence of the method and the comparability between different
laboratories. This includes the knowledge about all the factors which influence the test procedure itself, determination of
best testing conditions, testing of these conditions in round-robins to get a view of the comparability of results, and formulation
of guidelines for standardization. In a European project several test methods for hard coatings on steel were investigated
for this purpose and the elastic moduli of the coating and coating thickness were determined non-destructively by means of
quantitative acoustic microscopy. This method and the instruments available had not yet been certified in the fields of coatings
simply owing to the absence of standardised signal processing, followed by the determination of sound velocities and materials
parameter extraction. For this purpose four laboratories carried out investigations and measurements on reference samples
and on two types of hard coatings (titanium nitride and C-doped chromium) on M2 tool steel. 相似文献
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Extensive new high-temperature, high-resolution FTIR emission spectroscopy measurements for the five common isotopomers of GeO are combined with previous diode laser and microwave measurements in combined isotopomer analyses. New Dunham expansion parameters and an accurate analytical potential energy function are determined for the ground X1Sigma+ state. Copyright 1999 Academic Press. 相似文献