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Fundamental studies of the mechanism of catalytic reactions with catalysts effective in the gasification of carbon solids and the oxidative coupling of methane. Quarterly report, April 1, 1993--June 30, 1993

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[唯一标识符]:CDSTIC.DOE.10176357
[文献来源]:美国能源部报告数据库
[文献类型]:科技报告
[资源原始索取号]:OSTI ID: 10176357; Legacy ID: DE93019103
[标题]:Fundamental studies of the mechanism of catalytic reactions with catalysts effective in the gasification of carbon solids and the oxidative coupling of methane. Quarterly report, April 1, 1993--June 30, 1993
[作者]:Heinemann, H.; Somorjai, G.A.; Perry, D.L.
[机构]:Lawrence Berkeley Lab., CA (United States)
[文摘]:The last quarterly report (LBL-33769) summarized results obtained with ternary catalysts; e.g., K-Ca-Ni oxide and K-Ca-Co oxide. It was also shown that chars prepared in e presence of NAOH were more easily gasified than the base char, even if the chars were washed to remove all residual free NAOH. During the present report quarter, three variables were investigated: (1) The effect of varying the atomic ratio of different catalyst components (alkali vs. transition metal); (2) The effect of steam partial pressure and of temperature on the reaction; (3) Determination of activation energy of the reaction over K-Ca-Co oxide. It was also found that if the water (steam) used for gasification contains a small amount of NAOH, gasification rates are greatly improved. Figure 1 shows that the gasification rate improves with increasing Co content of the catalyst, though the differences between different Co contents are relatively small. A very similar effect was observed for different concentrations of Fe{sup 3+} in KCa-Fe oxide catalysts. Figure 2 presents conversion vs. time plots for gasification of an Ill {number_sign}6 char (which had been charred in the presence of 0.5% caustic) over a K-Ca-Co oxide catalyst at four temperatures. As expected the gasification rate increases with temperature, although there is little difference between our standard 640{degree}C and 680{degree}C. Figure 3 investigates the effect of partial pressure of water on the conversion using an Ill {number_sign}6 char (prepared in the presence of 0.5% caustic) and a K-Ca-Co oxide catalyst at 640{degree}C. There is an improvement in rate with increasing water partial pressure.
[关键词]:01 COAL, LIGNITE, AND PEAT; CHARS; COAL GASIFICATION; CATALYSTS; PROGRESS REPORT; POTASSIUM OXIDES; CALCIUM OXIDES; NICKEL OXIDES; COBALT OXIDES; CATALYTIC EFFECTS; SODIUM HYDROXIDES; STEAM; PARTIAL PRESSURE; TEMPERATURE DEPENDENCE
[出版时间]:1993 Aug 01
[出版年份]:1993
[报告号]:LBL--34250
[合同号]:AC03-76SF00098
[主办机构]:USDOE, Washington, DC (United States)
[来源]:Technical Report
[来源关系]:Other Information: PBD: [1993]
[覆盖领域]:Quarterly
[其他获取途径]:OSTI; NTIS; GPO Dep.
[国别]:United States
[总页数]:22


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[唯一标识符]:CDSITC.AEROSPACE.A03-11419
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A2003-11419
[标题]:Luminescence and scintillation properties of YAG:Pr
[作者]:Wisniewska M; Wisniewski D; Wojtowicz A J; Tavernier S *; Lukasiewicz T; Frukacz Z; Galazka Z; Malinowski M
[来源]:IEEE-Transactions-on-Nuclear-Science. 2002 June; vol. 49, no. 3: 926-930
[文摘]:In this paper, we report on the scintillation and spectroscopic properties of YAG crystals activated with Pr(3+) ions. The light yield of this material was found to be dependent on the level of activation. Best results are achieved for a nominal Pr(3+) concentration of 0.24 at. pct. Spectroscopic results reveal effects readily explained in the frame of a recombinational model of YAG:Pr scintillation. (Author)
[关键词]:LUMINESCENCE ; SCINTILLATION ; YTTRIUM ALUMINUM GARNET; PRASEODYMIUM ; CRYSTAL OPTICS; SPECTROSCOPY ; IONS ; CONCENTRATION COMPOSITION; ACTIVATION
[出版年份]:2002
[专业领域]:Solid State Physics
[唯一标识符]:CDSITC.AEROSPACE.A88-23831
[文献来源]:美国航空航天数据库(aerospace)
[资源原始索取号]:A1988-23831; Reference AN: A88-23831
[标题]:The radial velocity curve and peculiar TiO distribution of the red secondary star in Z Chamaeleontis
[作者]:WADE RICHARD A; HORNE KEITH
[来源]:Astrophysical Journal Part 1. vol. 324, Jan. 1, 1988, p. 411 430.
[文摘]:Data on the secondary star of Z Cha have been obtained with the CCD spectrograph of the CTIO 4-m telescope, giving a spectral type of M5.5 for this star. The absolute absorption strength of TiO is shown to be weak on the side of the star that faces the white dwarf and the accretion disk. Masses of 0.84 + or - 0.09 and 0.125 + or - 0.014 solar masses are found for the white dwarf and the secondary star, respectively. It is noted that standard assumptions must be relaxed in order to provide a consistent model for Z Cha. The observed splitting of double-peaked emission lines implies a velocity that is 70 + or - 10 percent of the Keplerian velocity at the outer edge of the accretion disk. (R.R.)
[关键词]:DWARF NOVAE; ECLIPSING BINARY STARS; RADIAL VELOCITY; SPATIAL DISTRIBUTION; TITANIUM OXIDES; VELOCITY DISTRIBUTION; ABSORPTION SPECTRA; ACCRETION DISKS; CHARGE COUPLED DEVICES; M STARS; STELLAR LUMINOSITY; STELLAR SPECTROPHOTOMETRY
[出版年份]:1988
[专业领域]:ASTROPHYSICS

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