搜索结果: 1-11 共查到“理学 DRIFTS”相关记录11条 . 查询时间(0.111 秒)
Morphology of F-region vertical E×B drifts in the African sector using ionosonde measurements
equatorial F-region ionospheric variability ionospheric modelling ionosonde observations ionospheric dynamics
2015/9/2
F-region vertical velocities are derived from the ground-based ionosonde data for Ibadan (7.4°N, 3.9°E; dip 6°S:
an equatorial station in the African zone), to study the general characteristics of el...
EXIT TIMES OF DIFFUSIONS WITH INCOMPRESSIBLE DRIFTS
EXIT TIMES DIFFUSIONS INCOMPRESSIBLE DRIFTS
2015/7/14
Let Ω ⊂ Rn be a bounded domain and for x ∈ Ω let τ(x) be the expected exit time from Ω of a diffusing particle starting at x and advected by an incompressible flow u. We are in...
The Harnack inequality for second-order elliptic equations with divergence-free drifts
Harnack inequality second-order elliptic equations divergence-free drifts
2015/7/14
We consider an elliptic equation with a divergence-free drift b. We prove that an inequality of Harnack type holds under the assumption b ∈ Ln/2+δ ∩ L2 where δ > 0. As an application we provide a one ...
The Harnack inequality for second-order parabolic equations with divergence-free drifts of low regularity
Harnack inequality second-order parabolic equations divergence-free drifts low regularity
2015/7/14
We establish the Harnack inequality for advection-diffusion equations with divergencefree drifts of low regularity.While our previous work [IKR] considered the elliptic case, here we treat the more ch...
Cu-ZSM-5分子筛催化剂选择性催化还原NO具有较好的低温活性，在613 K时NO还原成N2的转化率达70.6%。原位漫反射红外光谱(In situ DRIFTS)是研究催化剂表面吸附物种及催化机理的重要方法，应用该方法在298～773 K范围原位考察了以C3H6为还原剂及富O2 条件下，NO在Cu-ZSM-5催化剂上的表面吸附及选择性催化还原。认为NO在Cu-ZSM-5催化剂上还原为N2的过程...
原位DRIFTS研究CH4部分氧化和CO2重整的耦合
原位漫反射红外光谱 耦合反应 钌 反应机理
2009/4/9
8%Ru-5%Ce/γ-Al2O3催化剂对于甲烷的低温活化具有较好的催化活性，在500 ℃下甲烷、二氧化碳和氧气的耦合反应中，吸热反应二氧化碳重整和放热反应甲烷部分氧 化进行耦合强化，使得耦合反应中的甲烷转化率为38.8%。用原位漫反射傅里叶红外光谱法对钌系催化剂耦合甲烷部分氧化和二氧化碳重整反应体系机理进行研究。CO在8%Ru-5%Ce/γ- Al2O3上吸附，表明CO在催化剂表面上波数为2 1...
DRIFTS and Knudsen cell study of the heterogeneous reactivity of SO2 and NO2 on mineral dust
DRIFTS Knudsen cell study heterogeneous reactivity SO2 NO2 mineral dust
2009/3/11
The heterogeneous oxidation of SO2 by NO2 on mineral dust was studied using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and a Knudsen cell. This made it possible to characteri...
利用原位红外漫反射技术(DRIFTS)对抗硫中毒催化剂Pt/Ce0.8Gd0.2O1.9 (Pt/CGO)上CO吸附、CO/噻吩共吸附以及CO/H2S顺序吸附进行了研究,并与Pt/Al2O3催化剂进行了比较. CO吸附实验表明, 1.6%Pt/CGO-800(800 ℃焙烧)上CO的红外特征吸收峰在2104cm-1, 与1.6%Pt/Al2O3-500上CO的红外特征吸收峰(2070cm-1)相比...
Average Seasonal Variation of the Atlantic Equatorial Currents from Historical Ship Drifts
South Equatorial Current Seasonal Variation Historical Ship Drifts
2009/1/20
Surface currents in the tropical Atlantic were studied using historical ship-drift data. These are the only available data capable of resolving the long-term seasonal fluctuations of currents over a b...
Large Scale, Low Frequency Variability of the 1979 FGGE Surface Buoy Drifts and Winds over the Southern Hemisphere
antarctic Circumpolar Current Low Frequency Variability FGGE Surface Buoy Drifts Southern Hemisphere
2008/12/30
The surface response of the Southern Hemisphere's oceans to the large spatial scale, interseasonal changes in wind forcing during the FGGE year of 1979 is investigated. The primary data are the analyz...
Characterization of Tubular Chrysotile by Thermoporometry, Nitrogen Sorption, Drifts, and TEM
Chrysotile asbestos Infrared spectroscopy N2 adsorption and desorption Thermoporometry Transmission electron microscopy X-ray diffraction
2011/12/30
The maximum crystal radius Rn of ice in hollow wet chrysotile tubes is established by thermoporometry to be between 2.8 and 3.2 nm, and the internal pore volume Vn of the tubes to be between 0.008 and...