Micro-CT and FIB–SEM imaging and pore structure characterization of dolomite rock at multiple scales     

Rajakumar S. Devarapalli  Amina Islam  Titly Farhana Faisal  Mohamed Sassi  Mustapha Jouiad 《Arabian Journal of Geosciences》2017,10(16):361

With improvements of imaging techniques and computational power, Digital Rock Physics (DRP) has been increasingly used to determine transport and elastic properties of reservoir core plugs. Since numerical computations highly rely on accurate 3D representations of the porous microstructure of the rocks, the imaging technique and the scale at which the imaging is performed is a critical parameter. In this paper, we introduce a multiscale imaging workflow that uses both micro-X-ray tomography (micro-XCT) and focused ion beam combined with scanning electron microscope (FIB–SEM) to characterize a dolomite rock from the microscale to the nanoscale. This allows for the accurate capture of the different heterogeneities that exist in the carbonate (texture, mineralogy, pore size). The reconstructed microporous structures were then used to successfully predict elastic and permeability properties of selected carbonate.  相似文献   

Urban flood vulnerability assessment in a densely urbanized city using multi-factor analysis and machine learning algorithms     

Parvin  Farhana  Ali  Sk Ajim  Calka  Beata  Bielecka  Elzbieta  Linh  Nguyen Thi Thuy  Pham  Quoc Bao 《Theoretical and Applied Climatology》2022,149(1-2):639-659

Theoretical and Applied Climatology - Flood is considered as the most devastating natural hazards that cause the death of many lives worldwide. The present study aimed to predict flood...  相似文献   

Malachite Green Adsorption onto Chitosan Coated Bentonite Beads: Isotherms,Kinetics and Mechanism     

Wan Saime Wan Ngah  Noorul Farhana Md Ariff  Azhan Hashim  Megat Ahmad Kamal Megat Hanafiah 《洁净——土壤、空气、水》2010,38(4):394-400

The removal of Malachite green (MG) from aqueous solutions by cross‐linked chitosan coated bentonite (CCB) beads was investigated and the CCB beads were characterized by Fourier Transform Infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS) and X‐ray diffraction (XRD) analysis. Solubility and swelling tests were performed in order to determine the stability of the CCB beads in acidic solution, basic solution and distilled water. The amount of MG adsorbed was shown to be influenced by the initial pH of the solution, contact time and the initial MG concentration. A kinetic study indicated that a pseudo‐second‐order model agreed well with the experimental data. From the Langmuir isotherm model, the maximum adsorption capacity of MG was found to be 435.0 mg g^–1. Desorption tests were carried out at different concentrations of EDTA, H₂SO₄ and NaOH. However, all desorbing solutions showed zero recovery of MG at all concentrations.  相似文献   

Implementing the Kyoto Protocol without Russia     

Erik Haites  Farhana Yamin  Odile Blanchard  Claudia Kemfert 《Climate Policy》2013,13(2):143-152

Abstract

This paper examines implementation of the Kyoto Protocol without Russia. It concludes that implementation without Russia is possible, although it requires political will on the part of the countries that wish to proceed with the Protocol. It would lead to higher compliance costs for Annex B buyer regions, but other regions, except Russia, would benefit financially. Russia would forego revenue of at least $20 billion for the first commitment period. Implementation without Russia could improve the environmental performance of the Protocol. It would reduce reliance on Annex B sinks, use of surplus assigned amount units (AAUs) for compliance, and the quantity of Kyoto units banked for subsequent commitment periods. Actual emissions by Kyoto Protocol Parties would fall, but the reduction may be offset by leakage to the US and Russia.  相似文献