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Piroozian A, Hemmati M, Safari M, Rahimi A, Rahmani O, Aminpour SM, Pour AB. A mechanistic understanding of the water-in-heavy oil emulsion viscosity variation: effect of asphaltene and wax migration. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125604] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kashim MZ, Tsegab H, Rahmani O, Abu Bakar ZA, Aminpour SM. Reaction Mechanism of Wollastonite In Situ Mineral Carbonation for CO 2 Sequestration: Effects of Saline Conditions, Temperature, and Pressure. ACS Omega 2020; 5:28942-28954. [PMID: 33225124 PMCID: PMC7675570 DOI: 10.1021/acsomega.0c02358] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
The research presented here investigates the reaction mechanism of wollastonite in situ mineral carbonation for carbon dioxide (CO2) sequestration. Because wollastonite contains high calcium (Ca) content, it was considered as a suitable feedstock in the mineral carbonation process. To evaluate the reaction mechanism of wollastonite for geological CO2 sequestration (GCS), a series of carbonation experiments were performed at a range of temperatures from 35 to 90 °C, pressures from 1500 to 4000 psi, and salinities from 0 to 90,000 mg/L NaCl. The kinetics batch modeling results were validated with carbonation experiments at the specific pressure and temperature of 1500 psi and 65 °C, respectively. The results showed that the dissolution of calcium increases with increment in pressure and salinity from 1500 to 4000 psi and 0 to 90000 mg/L NaCl, respectively. However, the calcium concentration decreases by 49%, as the reaction temperature increases from 35 to 90 °C. Besides, it is clear from the findings that the carbonation efficiency only shows a small difference (i.e., ±2%) for changing the pressure and salinity, whereas the carbonation efficiency was shown to be enhanced by 62% with increment in the reaction temperature. These findings can provide information about CO2 mineralization of calcium silicate at the GCS condition, which may enable us to predict the fate of the injected CO2, and its subsurface geochemical evolution during the CO2-fluid-rock interaction.
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Affiliation(s)
- M. Zuhaili Kashim
- Department of Geoscience, Universiti Teknologi PETRONAS (UTP), 32610Seri Iskandar, Tronoh, Perak Darul Ridzuan, Malaysia
- Department of Gas Sustainability Technology, PETRONAS Research Sdn Bhd, Kawasan Institusi Bangi, Kajang 43000, Selangor
Darul Ehsan, Malaysia
| | - Haylay Tsegab
- Department of Geoscience, Universiti Teknologi PETRONAS (UTP), 32610Seri Iskandar, Tronoh, Perak Darul Ridzuan, Malaysia
- Southeast Asia Carbonate
Research Laboratory, Universiti Teknologi
PETRONAS (UTP), Seri Iskandar 32610, Tronoh, Perak Darul
Ridzuan, Malaysia
| | - Omeid Rahmani
- Department of Natural
Resources Engineering and Management, School of Science and Engineering, University of Kurdistan Hewlêr (UKH), Erbil 44001, Kurdistan Region, Iraq
| | - Zainol Affendi Abu Bakar
- Department of Gas Sustainability Technology, PETRONAS Research Sdn Bhd, Kawasan Institusi Bangi, Kajang 43000, Selangor
Darul Ehsan, Malaysia
| | - Shahram M. Aminpour
- Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran 11365-11155, Iran
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Ghomghaleh A, Khaloukakaie R, Ataei M, Barabadi A, Nouri Qarahasanlou A, Rahmani O, Beiranvand Pour A. Prediction of remaining useful life (RUL) of Komatsu excavator under reliability analysis in the Weibull-frailty model. PLoS One 2020; 15:e0236128. [PMID: 32667940 PMCID: PMC7363100 DOI: 10.1371/journal.pone.0236128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 06/29/2020] [Indexed: 11/19/2022] Open
Abstract
It is an essential task to estimate the remaining useful life (RUL) of machinery in the mining sector aimed at ensuring the production and the customer’s satisfaction. In this study, a conceptual framework was used to determine the RUL under the reliability analysis in a frailty model. The proposed framework was implemented on a Komatsu PC-1250 excavator from the Sungun copper mine. Also, the Weibull-frailty model was selected to describe the failure behavior and compare it with the classical-exponential model. The frailty model was also used to evaluate the impact of unobserved environmental conditions on the RUL values. Both applied models were fitted to the obtained data from 80 operational hours of the Komatsu PC-1250 excavator. Plotting the results from the reliability analysis of two models demonstrated that the mine system with the frailty model performs better than the classical model before reaching the reliability of 80%. Besides, the frailty model shows a coherent with the operational time of the excavator, while the classical model demonstrates a sinusoid variation. The obtained results may be used for the development of maintenance, preventive repairs planning, and the spare parts replacement intervals.
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Affiliation(s)
- Awat Ghomghaleh
- School of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
| | - Reza Khaloukakaie
- School of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
| | - Mohammad Ataei
- School of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
| | - Abbas Barabadi
- Department of Engineering and Safety, UiT The Arctic University of Norway, Tromsø, Norway
| | - Ali Nouri Qarahasanlou
- School of Mining, Petroleum & Geophysics Engineering, Shahrood University of Technology, Shahrood, Iran
| | - Omeid Rahmani
- Department of Natural Resources Engineering and Management, School of Science and Engineering, University of Kurdistan Hewlêr (UKH), Erbil, Kurdistan Region, Iraq
- * E-mail:
| | - Amin Beiranvand Pour
- Institute of Oceanography and Environment (INOS), Universiti Malaysia Terengganu (UMT), Kuala Nerus, Terengganu, Malaysia
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Rahmani O. Corrigendum to “CO2 sequestration by indirect mineral carbonation of industrial waste red gypsum” [J. CO2 Util. 27 (2018) 374–380]. J CO2 UTIL 2020. [DOI: 10.1016/j.jcou.2019.11.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rahmani O, Tyrer M, Junin R. Correction: Calcite precipitation from by-product red gypsum in aqueous carbonation process. RSC Adv 2016. [DOI: 10.1039/c6ra90036d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Correction for ‘Calcite precipitation from by-product red gypsum in aqueous carbonation process’ by Omeid Rahmani et al., RSC Adv., 2014, 4, 45548–45557.
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Affiliation(s)
- Omeid Rahmani
- Department of Petroleum Engineering
- Faculty of Petroleum and Renewable Energy Engineering
- Universiti Teknologi Malaysia (UTM)
- Malaysia
- Department of Petroleum Engineering
| | - Mark Tyrer
- Mineral Industry Research Organisation
- Birmingham
- UK
| | - Radzuan Junin
- Department of Petroleum Engineering
- Faculty of Petroleum and Renewable Energy Engineering
- Universiti Teknologi Malaysia (UTM)
- Malaysia
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Rahmani O, Asemani SS, Hosseini SAH. Study the Buckling of Functionally Graded Nanobeams in Elastic Medium with Surface Effects Based on a Nonlocal Theory. ACTA ACUST UNITED AC 2015. [DOI: 10.1166/jctn.2015.4095] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
Red gypsum has not yet been investigated for the carbonation process. Lack of study of this gives novelty to this study.
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Affiliation(s)
- Omeid Rahmani
- Department of Petroleum Engineering
- Faculty of Petroleum and Renewable Energy Engineering
- Universiti Teknologi Malaysia
- UTM
- , Malaysia
| | - Mark Tyrer
- Mineral Industry Research Organisation
- Birmingham, UK
| | - Radzuan Junin
- Department of Petroleum Engineering
- Faculty of Petroleum and Renewable Energy Engineering
- Universiti Teknologi Malaysia
- UTM
- , Malaysia
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Mohammadian E, Junin R, Rahmani O, Idris AK. Effects of sonication radiation on oil recovery by ultrasonic waves stimulated water-flooding. Ultrasonics 2013; 53:607-614. [PMID: 23137783 DOI: 10.1016/j.ultras.2012.10.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2012] [Revised: 10/10/2012] [Accepted: 10/11/2012] [Indexed: 06/01/2023]
Abstract
Due to partial understanding of mechanisms involved in application of ultrasonic waves as enhanced oil recovery method, series of straight (normal), and ultrasonic stimulated water-flooding experiments were conducted on a long unconsolidated sand pack using ultrasonic transducers. Kerosene, vaseline, and SAE-10 (engine oil) were used as non-wet phase in the system. In addition, a series of fluid flow and temperature rise experiments were conducted using ultrasonic bath in order to enhance the understanding about contributing mechanisms. 3-16% increase in the recovery of water-flooding was observed. Emulsification, viscosity reduction, and cavitation were identified as contributing mechanisms. The findings of this study are expected to increase the insight to involving mechanisms which lead to improving the recovery of oil as a result of application of ultrasound waves.
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Affiliation(s)
- Erfan Mohammadian
- Department of Petroleum Engineering, Faculty of Petroleum and Renewable Energy Engineering, Universiti Teknologi Malaysia, 81310 UTM, Johor, Malaysia
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Sahli A, Kebdani S, Boutchicha D, Rahmani O. Stress intensity solutions for cracked orthotropic plates. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100609004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mehta M, Rahmani O, Dietzek AM, Mecenas J, Scher LA, Friedman SG, Safa T, Ohki T, Veith FJ. Eversion technique increases the risk for post-carotid endarterectomy hypertension. J Vasc Surg 2001; 34:839-45. [PMID: 11700484 DOI: 10.1067/mva.2001.118817] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The incidence of postoperative hypertension (HTN) after eversion carotid endarterectomy (e-CEA) was compared with that after standard carotid endarterectomy (s-CEA). METHODS In a retrospective analysis from January 1998 to January 2000, 217 patients underwent 219 CEAs for symptomatic (68) or asymptomatic (151) high-grade (>80%) carotid artery stenosis by either standard (137) or eversion (82) techniques. The eversion technique involves an oblique transection of the internal carotid artery at the carotid bulb and a subsequent endarterectomy by everting the internal carotid artery over the atheromatous plaque. All procedures were done under general anesthesia, and somatosensory-evoked potentials were used for cerebral monitoring. Patients with s-CEA were compared with those with e-CEA for postoperative hemodynamic instability, carotid sinus nerve block, requirement for intravenous vasodilators or vasopressors, stroke, and death. RESULTS Patients who underwent e-CEA had a significantly (P <.005) increased postoperative blood pressure and required more frequent intravenous antihypertensive medication (24%), compared with patients having an s-CEA (6%). Furthermore, postoperative vasopressors were required after 10% of s-CEAs, but after none of the e-CEAs. No statistically significant difference was noted in the morbidity or mortality of patients after s-CEA and e-CEA. CONCLUSION e-CEA is a substantial risk factor for HTN in the immediate postoperative period, when compared with the s-CEA. This difference would be even more remarkable in the absence of antihypertensive medications in the e-CEA group and vasopressors in the s-CEA group. Therefore, particular attention should be focused on diagnosing and controlling postoperative HTN in patients after e-CEA.
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Affiliation(s)
- M Mehta
- Division of Vascular Surgery, Department of Surgery, Montefiore Medical Center, Albert Einstein College of Medicine, New York, NY, USA
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Safa TK, Friedman S, Mehta M, Rahmani O, Scher L, Pogo G, Hall M. Management of coexisting coronary artery and asymptomatic carotid artery disease: report of a series of patients treated with coronary bypass alone. Eur J Vasc Endovasc Surg 1999; 17:249-52. [PMID: 10092900 DOI: 10.1053/ejvs.1998.0752] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND A retrospective chart review of 94 patients with asymptomatic high-grade carotid stenosis undergoing coronary bypass (and valve replacement in some cases) was performed to determine whether significant carotid lesions can be safely ignored in patients undergoing cardiac surgical procedures. These operations were performed during a 2-year period. PATIENTS AND METHODS There were 55 men and 39 women, with an age range of 37-89 years. Seventy-one patients had unilateral high-grade carotid stenosis, 17 patients had bilateral high-grade lesions, and six patients had unilateral high-grade stenosis and contralateral occlusion. Associated medical problems were recorded and short-term follow-up was obtained. RESULTS There was one perioperative stroke and no deaths in this group of patients. CONCLUSIONS Although these data indicate that high-grade carotid stenoses may be safely ignored during cardiac surgical procedures, a multicentre prospective randomized trial is needed to determine the appropriate treatment of the patient with coexisting carotid and coronary artery disease.
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Affiliation(s)
- T K Safa
- Division of Vascular Surgery, North Shore University Hospital, Manhasset, NY 11030, USA
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