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Closed-loop bulk air conditioning: A renewable energy-based system for deep mines in arctic regions

International Journal of Mining Science and Technology 2020年第4期30卷 511-516页

作者： ali fahrettin kuyuk Seyed ali Ghoreishi-Madiseh Faramarz P.Hassani NBK Institute of Mining Engineering University of British ColumbiaVancouverBritish Columbia V6T 1Z4Canada Department of Mining and Materials Engineering McGill UniversityMontrealQuebec H3A 0E8Canada

With depletion of shallow deposits,the number of underground mines expected to reach more than 3 km depth during their lifetime is *** surface cooling plants are mostly effective in mine airconditioning,usually secondary cooling units are needed below 2 *** need emerges due to the elevated thermal impacts caused by auto-compression of mine air as well as heat emissions from strata and mine *** a result,in cold climates,like Canada,ultra-deep mines need their secondary underground cooling plants running year-round while the intake air must be heated to protect the sensitive machinery and liners from freezing during the winter *** cool mine air,horizontal bulk-airconditioners with direct spray cooling systems are commonly used due to their high ***,sprayed water in bulk-air-coolers are mechanically circulated and refrigerated in coupled refrigeration *** set up can be transformed to a natural cooling/heating process by resurfacing the warm underground bulk-air-cooler spray water for mine air heating on the surface and re-sinking the chilled water for cooling in the underground bulk air *** could significantly cut-down the fossil-fuel consumption in burners for mine air pre-conditioning and refrigeration cost when *** paper presents an anonymous real-life example to study the feasibility of the proposed idea for an ultra-deep Canadian mine.

关键词： Energy recovery Renewable energy Mine energy systems Underground cooling Mine air preconditioning Ventilation HVAC Mine air heating

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Nigella sativa relieves the deleterious effects of ischemia reperfusion injury on liver

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World Journal of Gastroenterology 2008年第33期14卷 5204-5209页

作者： fahrettin Yildiz Sacit Coban Alpaslan Terzi Mustafa Ates Nurten Aksoy Hale Cakir ali Riza Ocak Muharrem Bitiren Harran University Medical Faculty Department of General SurgerySanli Urfa 63300 Turkey Gaziantep University Medical Faculty Department of General SurgeryGaziantep 27310 Turkey Malatya State Hospital Department of General Surgery Malatya 44100 Turkey Harran University Medical Faculty Department of BiochemistrySanli Urfa 63300 Turkey Harran University Medical Faculty Department of Pathology Sanli Urfa 63300 Turkey

AIM: To determine whether Nigella sativa prevents hepatic ischemia-reperfusion injury to the liver. METHODS: Thirty rats were divided into three groups as sham (Group 1), control (Group 2), and Nigella sati-va (NS) treatment group (Group 3). All rats underwent hepatic ischemia for 45 min followed by 60 min period of reperfusion. Rats were intraperitoneally infused with only 0.9% saline solution in group 2. Rats in group 3 received NS (0.2 mL/kg) intraperitoneally, before isch-emia and before reperfusion. Blood samples and liver tissues were harvested from the rats, and then the rats were sacrifi ced. Serum aspartate aminotransfera-se (AST), alanine aminotransferase (ALT), and lactate dehydrogenase (LDH) levels were determined. Total antioxidant capacity (TAC), catalase (CAT), total oxida-tive status (TOS), oxidative stress index (OSI) and my-eloperoxidase (MPO) in hepatic tissue were measured. Also liver tissue histopathology was evaluated by light microscopy. RESULTS: The levels of liver enzymes in group 3 weresignifi cantly lower than those in the group 2. TAC in liver tissue was significantly higher in group 3 than in group 2. TOS, OSI and MPO in hepatic tissue were signifi cantly lower in group 3 than the group 2. Histo-logical tissue damage was milder in the NS treatment group than that in the control group. CONCLUSION: Our results suggest that Nigella sa-tiva treatment protects the rat liver against to hepatic ischemia-reperfusion injury.

关键词： Nigella sativa Ischemia reperfusion injury Liver

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