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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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Dispersive two-beam Fourier interferograms of N2-gas in the visible wave number range are calculated numerically for nonabsorbing as well as absorbing gas and compared with experiment. Some problems of inverse Fourier transformation of dispersive interferograms are also discussed. 相似文献
8.
We report high-resolution opto-acoustic spectroscopy of v = 0 → 1 vibrational rotational transitions of 15NO using a low field spin flip Raman laser as the source of tunable infrared radiation. Fifteen transitions belonging to the 2Σ thirteen transitions belonging to 2Π state have been measured and we report the Λ-doubling for the 2Π tran sitions. A preliminary analysis of the Λ-doubling parameters is given. 相似文献
9.
Direct evaluation of the subgrid scale scalar flux in turbulent premixed flames with conditioned dual-plane stereo PIV 总被引:1,自引:0,他引:1
Sebastian Pfadler Johannes Kerl Frank Beyrau Alfred Leipertz Amsini Sadiki Jrg Scheuerlein Friedrich Dinkelacker 《Proceedings of the Combustion Institute》2009,32(2):1723-1730
With the dual-plane stereo PIV technique the instantaneous three-dimensional resolved rate-of-strain tensor is directly measured in turbulent premixed flames. Simultaneously, also the instantaneous subgrid scale (SGS) scalar flux is measured with fine resolution, where for the latter term the conditioned particle image velocimetry (CPIV) technique is applied. The subgrid resolution reaches 118 μm, allowing a 9 × 9 resolution of a subgrid filter with width Δ = 1 mm. This combined measurement approach allows the a-priori comparison of models for the SGS scalar flux term with direct measurements which is important for large eddy simulation methods in turbulent premixed flames. Two different flame conditions of a premixed V-shaped turbulent flame are investigated where the turbulence intensity is varied by a factor of nearly three. The instantaneous radial and axial SGS fluxes are compared with the following three models: gradient model with Smagorinsky approach for the turbulent viscosity, Clark model, and extended gradient model with an anisotropy term. None of these models shows a good correlation with the directly measured flux. The anisotropy term alone (being nearly similar to the Clark model) shows, however, a right trend behaviour. An analysis of the data indicates a significant dependency of the experimentally determined SGS flux on the Favre averaged reaction progress (spatially averaged over the SGS area). A relatively simple closure for the SGS flux, which describes the dilatation due to the gasdynamic expansion, and which is a function proportional to , shows a rather good correlation with direct measurement for some of the components. A successful SGS scalar flux model for premixed turbulent flames most likely needs to include at least two different effects. 相似文献
10.
Isotopic and ultratrace analysis of uranium by double-focusing sector field ICP mass spectrometry 总被引:1,自引:0,他引:1
W. Kerl J. S. Becker H.-J. Dietze W. Dannecker 《Analytical and bioanalytical chemistry》1997,359(4-5):407-409
An analytical method for the ultratrace and isotopic analysis of uranium in radioactive waste samples using a double-focusing
sector field ICP mass spectrometer is described. In high-purity water a detection limit for uranium in the lowest fg/mL range
has been achieved. Under optimum experimental conditions (235U/238U ≈ 1), the precision in 235U/238U isotopic ratio determinations has been determined as 0.07% RSD. With the isotopic standard U-020 (235U/238U = 0.0208) a precision of 0.23% RSD at the 100 pg/mL level using ultrasonic nebulization has been achieved. With 234U/238U isotopic ratios of down to 10–5, the values obtained by double-focusing sector field ICP-MS and alpha spectrometry were in agreement.
Received: 27 February 1997 / Revised: 10 Juni 1997 / Accepted: 12 June 1997 相似文献