92 resultados para 0.22 per mil
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7.342[kW/(m~2·d)]7.18[kg/(m~2·d)]65.0%22.559.6%
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We investigated the solid particle flow characteristics and biomass gasification in a clapboard-type internal circulating fluidized bed reactor. The effect of fluidization velocity on particle circulation rate and pressure distribution in the bed showed that fluidization velocities in the high and low velocity zones were the main operational parameters controlling particle circulation. The maximum internal circulation rates in the low velocity zone came almost within the range of velocities in the high velocity zone, when uH/umf=2.2-2.4 for rice husk and uH/umf=3.5-4.5 for quartz sand. In the gasification experiment, the air equvalence ratio (ER) was the main controlling parameter. Rice husk gasification gas had a maximum heating value of around 5000kJ/m3 when ER=0.22-0.26, and sawdust gasification gas reached around 6000-6500kJ/m3 when ER=0.175-0.24. The gasification efficiency of rice husk reached a maximum of 77% at ER=0.28, while the gasification efficiency of sawdust reached a maximum of 81% at ER=0.25.
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We observed Sgr A* using the Very Large Array (VLA) and the Giant Metrewave Radio Telescope (GMRT) at multiple centimeter and millimeter wavelengths on 2003 June 17. The measured flux densities of Sgr A*, together with those obtained from the Submillimeter Array (SMA) and the Keck II 10 m telescope on the same date, are used to construct a simultaneous spectrum of Sgr A* from 90 cm to 3.8 mu m. The simultaneous spectrum shows a spectral break at about 3.6 cm, a possible signature of synchrotron self-absorption of the strong radio outburst that occurred near epoch 2003 July 17. At 90 cm, the flux density of Sgr A* is 0.22 +/- 0.06 Jy, suggesting a sharp decrease in flux density at wavelengths longer than 47 cm. The spectrum at long cm wavelengths appears to be consistent with free-free absorption by a screen of ionized gas with a cutoff similar to 100 cm. This cutoff wavelength appears to be three times longer than that of similar to 30 cm suggested by Davies, Walsh, & Booth based on observations in 1974 and 1975. Our analysis suggests that the flux densities of Sgr A* at wavelengths longer than 30 cm could be attenuated and modulated by stellar winds from massive stars close to Sgr A*.
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,,-::0.22×108Mpa.s.m-3,1/9;5.38×10-4m3/Mpa;4,
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The deep centers in AlGaAs/GaAs graded index-separate confinement heterostructure single quantum well (GRIN-SCHSQW) laser structures grown by MBE and MOCVD have been investigated using deep level transient spectroscopy (DLTS) technique, The majority and minority carrier DLTS spectra show that the deep (hole and electron) traps (Hi and E3), having large capture cross sections and concentrations, are observed in the graded n-AlxGa1-xAs layer of laser structures in addition to the well-known DX centers. For laser structures grown by MBE, the deep hole trap H1 and the deep electron trap E3 may be spatially localized in the interface regions of discontinuous variation Al mole fraction of the n-AlxGa1-xAs layer with x = 0.20-0.43. For laser structures grown by MOCVD, the deep electron trap E3 may be spatially localized in the n-AlxGa1-xAs layer with x = 0.18-0.30, and the DX center may be spatially localized in the interface regions of discontinuous variation Al mole fraction of the AlxGa1-xAs layer with x = 0.22-0.30.
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The transitions of E0 ,E0 A0, and E in dilute GaAs1-x Nx alloys with x = 0.10% ,0.22% ,0.36% ,and 0.62% are observed by micro-photoluminescence. Resonant Raman scattering results further confirm that they are from the intrinsic emissions in the studied dilute GaAsN alloys rather than some localized exciton emissions in the GaAsN alloys. The results show that the nitrogen-induced E E and E0 A0 transitions in GaAsN alloys intersect at a nitrogen content of about 0.16%. It is demonstrated that a small amount of isoelectronic doping combined with micro-photoluminescence allows direct observation of above band gap transitions that are not usually accessible in photoluminescence.
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We have investigated GaNAs/GaAs single quantum wells (SQWs) grown by molecular beam epitaxy (MBE) using photoluminescence (PL), time-resolved PL (TRPL) and photovoltaic (PV) techniques. The low temperature PL is dominated by spatially direct transitions involving electrons confined in GaNAs well and holes localized in the same GaNAs layer. This assignment was supported by PL decay time measurements and absorption line-shape analysis derived from the PV measurements. By fitting the experimental data with a simple calculation, the band offset of the GaN0.015As0.985/GaAS heterostructure was estimated, and a type II band lineup in GaN0.015As0.985/GaAs QWs was suggested. Moreover, DeltaE(C), the discontinuity of conductor band, is found to be a nonlinear function of the nitrogen (N) composition (x), and the average variation of DeltaE(C) is about 0.110eV per %N, The measured band bowing coefficient shows a strong function of x, giving an experimental support to the theoretic calculation of Wei et al [Ref.2].
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NetWaverCDPCriterium DecisionPlus3 (1). (2). (3). NetWeaver (4). 0.221 (5). CDPCriterium DecisionPlusrobustnessEMDSEcosystem Management Decision SystemARC/GIS
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CdPbCdPbCdPb 1) 80Cd(p < 0.05)3Cd(1.0, 2.55.0 mg/kg)80Cd(mg/kg) 0.222.46, 0.9014.102.0318.01, 0.79, 3.76 6.79 mg/kg DWCd15(1)Cd(2) (BF) < 1.0(3) (TF) < 1.0(4)CdCd3703Cd5CdCd 2) Pb5001500 mg/kg30Pb (p < 0.05)Pb0.528.68 1.8616.20 mg/kg, 3.01 6.87 mg/kg DWPbPbPbPb80Pb 3) CdPb(MDA)Cd(SOD)SOD3SODPb80SODSODCd(SP)PbSP 4) pHCdCdPb
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- 1A-UNA-NNB-UNB-NN85.0kgN/ha210kgN/ha120kgN/ha120kgN/ha35679 2 3B-UNNitrosospiraNitrosospira cluster3B-UN35 4797A-UN>B-UN>B-NN2.59mgN/Kg.d-112.6 mgN/Kg. d-191.84 mgN/Kg.d-1 2.28 mgN/Kg.d-1NH4+-NR=0.914p<0.001R=0.496p<0.05NH4+-NR=-0.803p<0.001 50.016 mgN/Kg.d-1-0.22 mgN/Kg.d-17B-UN0.22 mgN/Kg.d-1NO3- NNO3- NR=0.845p<0.00152.47 mgN/Kg.d-1-80.87 mgN/Kg.d-1 67928.7%26%9A-UNB-UN(A-UNB-NN)
