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Simulation of subcritical flow pattern in 180° uniform and convergent open-channel bends using SSIIM 3-D model

Water Science and Engineering 2011年第3期4卷 270-283页

作者： Rasool GHOBADIAN kamran mohammadi Department of Water Engineering Razi University Department of Water Engineering University of Tabriz

In meandering rivers, the flow pattern is highly complex, with specific characteristics at bends that are not observed along straight paths. A numerical model can be effectively used to predict such flow fields. Since river bends are not uniform-some are divergent and others convergent-in this study, after the SSIIM 3-D model was calibrated using the result of measurements along a uniform 180° bend with a width of 0.6 m, a similar but convergent 180v bend, 0.6 m to 0.45 m wide, was simulated using the SSI1M 3-D numerical model. Flow characteristics of the convergent 180° bend, including lengthwise and vertical velocity profiles, primary and secondary flows, lengthwise and widtbwise slopes of the water surface, and the helical flow strength, were compared with those of the uniform 180° bend. The verification results of the model show that the numerical model can effectively simulate the flow field in the uniform bend. In addition, this research indicates that, in a convergent channel, the maximum velocity path at a plane near the water surface crosses the channel＇s centerline at about a 30° to 40° cross-section, while in the uniform bend, this occurs at about the 50° cross-section. The varying range of the water surface elevation is wider in the convergent channel than in the uniform one, and the strength of the helical flow is generally greater in the uniform channel than in the convergent one. Also, unlike the uniform bend, the convergent bend exhibits no rotational cell against the main direction of secondary flow rotation at the 135° cross-section.

关键词： flow pattern numerical simulation, convergent 180° bend, SSIIM 3-D model

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Global prevalence of drug-resistant tuberculosis: a systematic review and meta-analysis

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Infectious Diseases of Poverty 2023年第3期12卷 1-12页

作者： Nader Salari Amir Hossein Kanjoori Amin Hosseinian-Far Razie Hasheminezhad kamran Mansouri Masoud mohammadi Department of Biostatistics School of HealthKermanshah University of Medical SciencesKermanshahIran Sleep Disorders Research Center Kermanshah University of Medical SciencesKermanshahIran Student Research Committee Kermanshah University of Medical SciencesKermanshahIran Department of Business Systems&Operations University of NorthamptonNorthamptonUK Medical Biology Research Center Kermanshah University of Medical SciencesKermanshahIran Cellular and Molecular Research Center Gerash University of Medical SciencesGerashIran

Background Tuberculosis is a bacterial infectious disease,which affects different parts of a human body,mainly lungs and can lead to the patient’s *** aim of this study is to investigate the global prevalence of drug-resistant tuberculosis using a systematic review and *** In this study,the PubMed,Scopus,Web of Science,Embase,ScienceDirect and Google Scholar repositories were systematically searched to find studies reporting the global prevalence of drug-resistant *** search did not entail a lower time limit,and articles published up until August 2022 were *** effects model was used to perform the *** heterogeneity of the studies was examined with the I^(2) *** analysis was conducted within the Comprehensive Meta-Analysis *** In the review of 148 studies with a sample size of 318,430 people,the I^(2) index showed high heterogeneity(I^(2)=99.6),and accordingly random effects method was used to analyze the *** bias was also examined using the Begg and Mazumdar correlation test which indicated the existence of publication bias in the studies(P=0.008).According to our meta-analysis,the global pooled prevalence of multi-drug resistant TB is 11.6%(95%CI:9.1–14.5%).Conclusions The global prevalence of drug-resistant tuberculosis was found to be very high,thus health authorities should consider ways to control and manage the disease to prevent a wider spread of tuberculosis and potentially subsequent deaths.

关键词： Prevalence Drug-resistant tuberculosis Burden Outbreak TB

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Risk assessment in poplar plantations:a case study from northern Iran

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Journal of Forestry Research 2020年第4期31卷 1225-1233页

作者： Samaneh Namdari kamran Adeli Soleiman mohammadi Limaei Zahra Bahramabadi Department of Forestry Agricultural and Natural Resources FacultyLorestan UniversityKhoramabadLorestan 68151-44316Iran Department of Forestry Faculty of Natural ResourcesUniversity of GuilanP.O.Box 1144Sowmeh SaraGuilanIran

Linear risk programming was used to determine the optimum cultivation pattern to increase incomes of poplar *** clones of Populus deltoides *** *** examined in Guilan province,northern *** and price data were taken from previous research at the Safrabaste Poplar Research Station and in interviews with *** Lingo software was used to analyze the data in different forms of *** results show that when risk was considered,the optimal solution included the clones Pd63/51-x1,-Pd72/51-x3,Pd73/51-x4 and Pd79/*** was a high growth fluctuations of the clones Pd69/55-x2,Pd77.51-x5,and Pd caroliniensis-x7 and were not included in cultivation ***,the existing farm plans executed by local farmers,is neither profitoriented nor efficient in terms of income risk management according to risk efficient *** results could help farmers with different levels of risk-aversion to select proper planting plans.

关键词： Populus deltoides Farmers Linear risk programming Optimum cultivation patterns

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Metformin alleviates cholestasis-associated nephropathy through regulating oxidative stress and mitochondrial function

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Liver Research 2021年第3期5卷 171-180页

作者： Mohammad Mehdi Ommati Hamidreza mohammadi Khadijeh Mousavi Negar Azarpira Omid Farshad Reyhaneh Dehghani Asma Najibi Sedigheh kamran Hossein Niknahad Reza Heidari College of Life Sciences Shanxi Agricultural UniversityTaiguShanxiChina Pharmaceutical Sciences Research Center Shiraz University of Medical SciencesShirazIran Department of Pharmacology and Toxicology School of PharmacyShiraz University of Medical SciencesShirazIran Transplant Research Center Shiraz University of Medical SciencesShirazIran Department of Chemistry Payame Noor UniversityTehranIran

Background and aim:Cholestasis-associated renal injury or cholemic nephropathy(CN)is a serious clinical *** studies mentioned that oxidative stress and mitochondrial impairment play a role in *** is no specific pharmacological intervention for *** is an anti-diabetic drug administered for *** the other hand,novel pharmacological properties have emerged for this *** effect of metformin on oxidative stress parameters has been well-recognized in different experimental *** has also been found that metformin positively affected mitochondrial *** current study aimed to evaluate the effects of metformin in an animal model of ***:Rats underwent bile duct ligation(BDL)and were treated with metformin(250 and 500 mg/kg)for 14 consecutive *** weeks after the BDL operations,urine,serum,and kidney samples were collected and ***:Markers of oxidative stress,including reactive oxygen species(ROS)formation,lipid peroxida-tion,protein carbonylation,depleted antioxidant capacity,and decreased glutathione(GSH)levels were detected in BDL ***,mitochondrial indices,including adenosine triphosphate(ATP)level,dehydrogenase activity,mitochondrial membrane potential,and mitochondrial permeability,were impaired in the kidney of cholestatic *** histopathological alterations in cholestatic animals included tubular degeneration and interstitial inflammation,cast formation,and *** was found that metformin significantly alleviated oxidative stress and improved mitochondrial indices in the kidney of cholestatic *** histopathological alterations were also mitigated in metformin-treated ***:Metformin could be a candidate for managing *** nephroprotective role of metformin is primarily associated with its effects on oxidative stress parameters and mitochondrial function.

关键词： Metformin Bile acids Cholestasis Cirrhosis Oxidative stress Mitochondrial function Energy crisis Cholemic nephropathy(CN) Renal failure

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