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The global,prevalence,and risk factors of postoperative fever after percutaneous nephrolithotomy:A systematic review and meta-analysis

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Asian Journal of Urology 2024年第2期11卷 253-260页

作者： reza falahatkar Siavash falahatkar Mohammad Amin Khajavi Gaskarei Masoomeh Afzalipoor Ali Mojtahedi Neda Aligolighasemabadi Ahmad Deilami Samaneh Mirzaei Dahka Mohammad-Hossein Keivanlou Alireza Jafari Urology Research Center Guilan University of Medical SciencesGuilanRashtIran Department of Surgery University of SaskatchewanSaskatoonCanada Microbiology Department School of MedicineGuilan University of Medical SciencesRashtIran Department of Internal Medicine School of MedicineGuilan University of Medical SiencesRashtIran School of Nursing and Midwifery Guilan University of Medical SciencesGuilanRashtIran

Objective:This study aimed to explore the global,prevalence,and risk factors of fever after percutaneous nephrolithotomy(PCNL)by conducting a systematic review and ***:The high-sensitivity searching was conducted without time limitation until December 30,2020 in Web of Sciences,Scopus,and PubMed based on inclusion and exclusion ***:The prevalence rates of fever and sepsis among patient undergoing PCNL were estimated 9.5%(95%confidence interval[CI]:9.3%-9.7%),and 4.5%(95%CI:4.2%-4.8%),*** tube was used in 9.96%(95%CI:9.94%-9.97%)of *** mean preoperative white blood cells of patients were 6.401×109/L;18.3%and 4.55%of patients were considered as the positive urinary culture and pyuria,*** 20.4%of patients suffered from residual *** odds ratios(ORs)of fever in patients who suffering from diabetes mellitus,hydronephrosis,staghorn stones,and blood transfusion were 4.62(95%CI:2.95-7.26),1.04(95%CI:0.81-1.34),2.57(95%CI:0.93-7.11),and 2.65(95%CI:1.62-4.35),*** who underwent PCNL in prone position were more likely to develop fever(OR:1.23;95%CI:0.75-2.00)than patients in supine ***:The current study showed that patients who suffer from diabetes mellitus,hydronephrosis,staghorn stones,nephrostomy tube or double-J stent,blood transfusion,and also patients who underwent PCNL in prone position surgery are more likely to develop a postoperative fever after PCNL.

关键词： Percutaneous nephrolithotomy Fever Hydronephrosis Diabetes Meta-analysis

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The Application of Radiation Shields for Thermal Control of Superheater Tubes in Boiler

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Energy and Power Engineering 2012年第2期4卷 77-84页

作者： Shahram falahatkar Tayeb Pour-reza Habib Karimi Department of Mechanical Engineering Langrud Branch Islamic Azad University Langrud Iran Department of Mechanical Engineering Roudsar-Amlash branch Islamic Azad University Roudsar Iran

Superheater tubes temperature control is a necessity for long lifetime, high efficiency and high load following capability in boiler. This study reports a new approach for the control strategy design of boilers with special shields. The presented control strategy is developed based on radiation thermal shields with low emissivity coefficient and high reflectivity or scattering coefficient. In order to simulate the combustion event in boiler and heat transfer to superheater tubes, an effective set of computational fluid dynamic (CFD) codes is used. Results indicate a successful identification of over- heated zones on platen superheater tubes and effect of radiation shields for solving this problem.

关键词： Platen Superheater Heat Transfer Combustion Radiation Thermal Shields Boiler CFD

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Soil Organic Carbon Stock as Affected by Land Use/Cover Changes in the Humid Region of Northern Iran

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Journal of Mountain Science 2014年第2期11卷 507-518页

作者： Samereh falahatkar Seyed Mohsen HOSSEINI Abdolrassoul SALMAN MAHINY Shamsollah AYOUBI WANG Shao-qiang Faculty of Natural Resource and Marine Science Tarbiat Modares University Department of Environmental Sciences Gorgan University of Agricultural Sciences and Natural Resources Department of Soil Sciences College of Agriculture Isfahan University of Technology Key Lab of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research

【Title】【Author】This study was conducted to determine the changes in the soil carbon stocks as influenced by land use in a humid zone of Deylaman district （10,876 ha）, a mountainous region of northern Iran. For this, land use maps were produced from TM and ETM＋ images for 1985, 2000 and 2010 years; and this was supplemented by field measurement of soil carbon in 2010. The results showed that the mean soil organic carbon （SOC） density was 6.7±1.8 kg C m-2, 5.2±3.4 kg C m-2 and 3.2±1.8 kg C m-2 for 0-20 cm soil layer and 4.8±1.9 kg C m-2, 3.1±2 kg C m-2 and 2.7±1.8 kg C m-2 for 20-40 cm soil layer in forest, rangeland and cultivated land, respectively. During the past 25 years, 14.4% of the forest area had been converted to rangeland; and 28.4% of rangelands had been converted to cultivated land. According to the historical land use changes in the study area, the highest loss of SOC stocks resulted from the conversion of the forest to rangeland （0.45×104 Mg C in 0-40 cm depth layer）; and the conversion of rangeland to cultivated land （0.37×104 Mg C in 0-40 cm）, which typically led to the loss of soil carbon in the area studied. The knowledge on the historical land use changes and its influence on overall SOC stocks could be helpful for making management decision for farmers and policy managers in the future, for enhancing the potential of C sequestration in northern Iran.

关键词： Soil organic carbon stocks Land cover Land use Iran

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Dissolved Organic Carbon Dynamics and Controls of Planted Slash Pine Forest Soil in Subtropical Region in Southern China

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Journal of Resources and Ecology 2013年第2期4卷 105-114页

作者：楚颖王绍强王晶苑 Matthias PEICHL Samereh falahatkar 中国科学院地理科学与资源研究所生态系统观测与模拟重点实验室北京100101 中国计量科学研究院计量管理与战略发展研究所北京100013 中国科学院大学北京100049 瑞典农业大学森林生态与管理系瑞典于默奥市se90183 伊朗Tarbiat Modares大学自然资源系

Soil dissolved organic carbon （DOC） is an active fraction of the soil organic carbon （SOC） pool and links terrestrial and aquatic systems. The degradation of DOC can affect carbon cycling, nutrient dynamics and energy supply to microorganism, and consequently change biogeochemical processes. This study investigated the vertical and seasonal variability of soil DOC concentrations and its controls in a 23-year-old planted slash pine （Pinus elliottii） forest at Qianyanzhou Forest Experimental Station （QFES） in Southern China. Soil solutions were collected at bimonthly intervals at depths of 10, 20 and 30 cm by a mechanical-vacuum extractor from November 2007 to March 2009, and at monthly intervals at depths of 10, 30 and 50cm from April 2009 to October 2010. The DOC concentrations were determined with a total organic carbon （TOC） analyzer. Mean （±standard deviation） DOC concentrations at depths of 10cm, 20cm, 30cm and 50cm were 12.4±4.4, 10.6±6.3, 8.7±2.6, and 8.0±5.9 mg L^-1, respectively. Both seasonal and spring means of DOC concentration showed a decreasing trend with increasing depth, while there was no clear trend for the summer, autumn, or winter seasons. DOC concentrations during spring, summer, autumn and winter ranged from 4.8 to 21.5, 4.9 to 26.2, 5.4 to 17.1, 4.9 to 14.6 mg L-1, respectively, their mean DOC concentrations were 10.2, 10.5, 10.8 and 8.3 mg L 1, respectively. No consistent pattern of seasonal variability of DOC concentrations at different depths was observed. No obvious relationship between organic carbon content of forest litter and DOC concentration was found. There was a positive linear relationship between SOC and DOC concentration （R2=0.19, p〈0.01）, which showed that SOC was one of the main controls of DOC. A positive exponential relationship existed between soil temperature at 5 cm and DOC concentrations at 10 cm depth in slash pine, masson pine （Pinus massoniana） and Chinese fir （Cunninghamia lanceolata） planted forests （R2=0.12, p〈0.01

关键词： dissolved organic carbon DOC concentration profile and seasonal variability characteristicsanalysis controlling factors

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Effect of stone composition,color,size,impaction and location on the efficacy of pneumatic ureterolithotripsy

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海南医学院学报 2009年第1期15卷 25-28页

作者： Siavash falahatkar Gholamreza Mokhtari Zahra Panahandeh Sadi Pourjafar Sara Nikpour Marzieh Akbarpour Urology Research Center Guilan University of Medical Science

Objective:Assessment of the relationship between stone location,composition,color,size and impaction with success rate of pneumatic ***:This study was performed on 440 patients who were candidate for pneumatic ureterolithotripsy admitted in an academic urology department from February 2004 to June *** criteria included active urinary tract infection and *** such as stone composition,color,impaction,size,location and surface were *** rate was defined as stone fragmentation to 5 mm stones respectively(P<0.000 1).Impaction did not correlate significantly with stone free rate(P=0.17).The success rate was 100 % in phosphate and cystine *** was a significant statistical difference between success rate and stone composition(P=0.026).The most common fragmented stone color was gold(95.5 %).Stone color correlated significantly with stone free rate(P<0.000 1).Conclusion:In this series ureterolithotripsy,stone free rate had a significant correlation with stone color,size,composition and location,but it was independent of stone impaction.

关键词：输尿管切除术输尿管肾盂炎药物治疗临床分析

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The Application of Radiation Shields for Thermal Control of Superheater Tubes in Boiler

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Energy and Power Engineering（能源与动力工程） 2012年第2期

作者： Shahram falahatkar Tayeb Pour-reza Habib Karimi

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