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Abu Dhabi, United Arab Emirates

Sethuraman K.,Anna University | Vengatesan M.R.,Petroleum Institute Abu Dhabi | Lakshmikandhan T.,Anna University | Alagar M.,Anna University
High Performance Polymers | Year: 2016

In the present work, allyl-terminated benzoxazine and thiol-functionalized polyhedral oligomeric silsesquioxane (SH-POSS) were synthesized and their molecular structures were confirmed by Fourier transform infrared, proton nuclear magnetic resonance (NMR), carbon-13 NMR, and silicon-29 NMR spectroscopies. The PBZ hybrid composite materials were developed through photopolymerization (ultraviolet (UV) lamp) reactions of allyl-terminated benzoxazine monomer with different weight percentages of SH-POSS (P10, P30, and P50 wt%), followed by thermal curing. The data obtained from transmission electron microscopy and X-ray diffraction analysis infer the presence of homogeneous morphology of the cured samples. Data obtained from differential scanning calorimetry, thermogravimetric analysis, UV transmittance, dielectric, and contact angle studies indicate that the dual cured P50-PBZ hybrid composite exhibits higher thermal, UV shielding, and hydrophobic behavior and lower value of dielectric constant than those of lower weight percentages of SH-POSS reinforced hybrid composites. © SAGE Publications. Source

Liu B.-G.,Kunming University of Science and Technology | Peng J.-H.,Kunming University of Science and Technology | Srinivasakannan C.,Petroleum Institute Abu Dhabi | Zhang L.-B.,Kunming University of Science and Technology | And 3 more authors.
Annals of Nuclear Energy | Year: 2015

The effects of process conditions on preparation of U3O8 by calcination from ammonium uranyl carbonate in microwave fields were assessed and optimized for maximizing the total uranium as well as calcination temperature, adopting as Central Composite Design (CCD) methodology. The process variables assessed were calcination temperature, calcination duration and mass of sample. A quadratic model relating the process variables and the total amount of uranium and U3O8 was proposed eliminating the insignificant parameters. The optimal calcination conditions were estimated to be a calcination temperature of 942.75 K, calcination duration of 8.78 min, with the corresponding total uranium and U3O8 to be 82.07% and 31.33%, respectively. © 2015 Elsevier Ltd. All rights reserved. Source

Rahman M.M.,Petroleum Institute Abu Dhabi
Petroleum Science and Technology | Year: 2010

Acid fracturing is a well stimulation process commonly used in low-permeable carbonate reservoirs. Carbonates are generally low permeable but with high storativity and are natural candidates for acid fracturing. Increased hydraulic fracture penetration with minimum acid fluid loss is the key to effective stimulation in carbonates. This article presents a program integrating acid fracture penetration, fluid loss control, fluid diffusion, conductivity, reservoir fluid flow model, and well productivity index with a two-dimensional hydraulic fracture model. This program shows the post-fracture productivity index, which increases by three to five times, depending on the treatment parameters. The present work will assist the designer in estimating the range of treatment parameters based on parametric sensitivity analyses. Copyright © Taylor & Francis Group, LLC. Source

Yu Y.-T.,Kunming University of Science and Technology | Peng J.-H.,Kunming University of Science and Technology | Liu B.-G.,Kunming University of Science and Technology | Chen G.,Kunming University of Science and Technology | Srinivasakannan C.,Petroleum Institute Abu Dhabi
High Temperature Materials and Processes | Year: 2013

Microwave and conventional heating were employed to synthesize micro-sized hematite powder from hydrous ferrous sulfate, a by-product in the process of titanium pigment manufacture. The TG/DTG analysis was used to study thermal behavior of the industrial ferrous sulfate. Therefore the temperature which was significant to product was defined. The calcination experiments were carried out to assess the effect of calcination temperature covering three different temperatures (650°C, 750°C and 850°C, respectively). X-ray powder diffraction (XRD) was used to characterize the structure of the product, while the scanning electron microscopy (SEM) was utilized to characterize the morphology of the product. Microwave calcination process resulted in a mixture of hematite and minor magnetite while a considerable amount of magnesium sulfate was detected with the conventional calcination process. The transformation from periclase to magnesium was discussed during the calcinations as well. The conventional heating resulted in porous product while the microwave heating resulted in smaller particle size. Source

Srinivasakannan C.,Petroleum Institute Abu Dhabi | Al Shoibi A.A.,Petroleum Institute Abu Dhabi | Balasubramanian N.,Anna University
Heat and Mass Transfer/Waerme- und Stoffuebertragung | Year: 2012

Fluidized bed drying kinetics of highly porous material which offers free flow of moisture to surface of the material is modeled utilizing the simplified bubbling bed model. The simplification step utilizes estimation of the overall transfer resistance, by summing all the resistances from the bubble phase to the emulsion phase. The model predictions are compared with the published experimental data covering the operating variables such as the inlet air temperature, the air flow rate, material characteristics and are found to match satisfactorily. The model highlights the importance of bubble size estimation, as it largely dictates the drying kinetics. © Springer-Verlag 2011. Source

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