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Computational analysis of neutronic effects of ThO_2 rods loaded in CANDU 6 fuel assemblies

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Nuclear Science and Techniques 2016年第4期27卷 14-20页

作者： Seyed mohammad Mirvakili Zohreh Gholamzadeh Seyed amir Hossein Feghhi Reactor Research School Nuclear Science and Technology Research Institute Department of Radiation Application Shahid Beheshti UniversityG.C

Thorium as a suitable fertile with higher natural resources in comparison with uranium resources has been remarkably considered by different nuclear energy user countries in the last decades. Its prominent features such as suitable possibility for power flattening of a nuclear reactor, applicable breeder blanket to produce^(233)U fissile as well as neutron leakage prevention from a nuclear core has caused its application as power flatter, breeder material or other aimed utilizations be evaluated by the researches. In the present study, neutronics of a modeled CANDU 6loaded with Th O_2 and UO_2fuel rods have been computationally studied. The study aimed at reprocessing of burned Th O_2 seeds at CANDU 6 reactor to recover the total produced uranium, which is to be going under another compound fuel cycle. The obtained results showed all the core reactivity coefficients are sufficiently negative. The modeled core 949 GWd burn-up concluding in 99.99 %depletion of^(235)U initial loads. 18.38 kg of^(233) U was produced in the burnt Th O_2 fuel after 1-year burn-up time. In addition, 31.84 kg of^(239) Pu was produced in the UO_2 spent fuel rods after the burn-up time. After a proposed cooling time, about 50.01 kg of^(233)U will be available in the spent Th O_2 fuel.

关键词： CANDU堆中子泄漏燃料组件稳定杆计算核反应堆燃烧时间自然资源

Effect of RE elements on the microstructural and mechanical properties of as-cast and age hardening processed Mg-4Al-2Sn alloy

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Journal of Magnesium and Alloys 2018年第3期6卷 309-317页

作者： amir Mahyar Majd mohammad Farzinfar Matin Pashakhanlou mohammad Javad Nayyeri Department of Materials Engineering Science and Research BranchIslamic Azad University(IAU)TehranIran

In the present article,the effect of Rare Earth elements on the microstructural development and mechanical properties of as cast and age treated Mg-4Al-2Sn(AT42)alloy is *** has been conducted by optical and scanning electron microscope,XRD and tensile *** of the data showed that alloy’s dendrites turn into larger dendritic structure with sharp and narrow arms from equiaxed rosette type by addition of RE *** contrast to the base alloy,aging treatment shows a positive effect on the mechanical properties(yield strength,tensile strength and elongation)of AT42+1RE alloy mainly because of retention of the thermally stable RE containing intermetallics as strong barriers to grain ***,increase of solute aluminum due to the decomposition of Mg 17 Al 12 along with saturated RE elements led to formation of blocky shape Al 2 RE in the microstructure during aging which enhanced the mechanical *** was found that the best result(yield of 70 MPa,tensile strength of 168 MPa and elongation of 14%)could be achieved by aging the AT42+1RE alloy at 443 K(170℃)for 8 ***,mechanical properties of AT42+1RE alloy starts to decrease after exceeding its optimum aging conditions due to the coarsening of intermetallics.

关键词： Magnesium alloys Aging Rare earth elements Mechanical properties Microstructure

Investigating the potential of using acoustic frequency on the degradation of linear alkylbenzen sulfonates from aqueous solution

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1462-1468页

作者： DEHGHANI mohammad Hadi MAHVI amir Hossein NAJAFPOOR Ali Asghar AZAM Kamal Department of Environmental Health Engineering School of Public HealthCenter for Environmental ResearchMedical Sciences/University of TehranTehranI.R. Iran Department of Environmental Health School of Public HealthMashhad University of Medical SciencesMashhadI.R. Iran Department of Epidemiology and Biostatistics School of Public HealthMedical Sciences/University of TehranTehranI.R. Iran

The effectiveness of using acoustical （sonochemical） reactor for degradation of linear alkylbenzen sulfonate （LAS） from aqueous solution was investigated. LASs are anionic surfactants, found in relatively high amounts in domestic and industrial wastewaters. In this study, experiments on LAS solution were performed using methylene blue active substances （MBAS） method. The effectiveness of acoustical processor reactor for LAS degradation is evaluated with emphasis on the effect of treatment time and initial LAS concentration. Experiments were performed at initial concentrations of 0.2, 0.5, 0.8 and 1.0 mg/L, acoustic frequency of 130 kHz, applied power of 500 W and temperature of 18℃-20℃. At the conditions involved, LAS degradation was found to increase with increasing sonochemical time. In addition, as the concentration increased, the LAS degradation rate decreased in the acoustical processor reactor.

关键词： Acoustical reactor Linear alkylbenzen sulfonate (LAS) Acoustic frequency Treatment time Power

Gastroprotective effect of aqueous stem bark extract of Ziziphus jujuba *** HCl/Ethanol-induced gastric mucosal injury in rats

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Journal of Traditional Chinese Medicine 2015年第6期35卷 666-670页

作者： Shokouhsadat Hamedi amir Ali Arian mohammad Hosein Farzaei Department of Persian pharmacy School of Persian and Complementary MedicineMashhad University of Medical Sciences Department of Physiology Mashhad University of Medical Sciences Pharmaceutical Sciences Research Center Faculty of PharmacyKermanshah University of Medical Sciences Medical Biology Research Center Kermanshah University of Medical Sciences

OBJECTIVE: To evaluated the gastroprotective effects of standardized aqueous extract of Ziziphus jujuba(Z. jujuba) stem bark against acidified ethanol-induced gastric ulcers as well as anti helicobacter pylori activity of the plant extract in ***: Five groups of rats were orally pre-treated with normal saline(0.9%) as ulcer group, 150 mg/kg of ranitidine as positive control group, 100, 200 and 400 mg of standardized extract solution as the experimental groups. Two hours later, acidified ethanol solution was given by gavages in order to induce of gastric ulcer. The antibacterial effect of extract against clinical strains of Helicobacter pylori(H. pylori) was evaluated through disc diffusion ***: The ulcer group exhibited significantly severe mucosal injury as compared with ranitidine or extract group which shows significant protective action against gastric mucosal injury. The extract showed no effect on H. ***: The present study indicates that *** stem bark extract had a potential antiulcer activity which might be due to its protective activity, providing a direct, protective effect on the gastric mucosa. Our study showed that anti-H. pylori activity was not among gastroprotective mechanism of Z. jujuba. Further pre-clinical and clinical investigations for evaluating natural active agents and efficacy of this plant are recommended.

关键词： Ziziphus jujuba Stomach ulcer Cytopro-tection Antisecretory factor Helicobacter pylori

Total load transport in gravel bed and sand bed rivers case study:Chelichay watershed

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International Journal of Sediment Research 2013年第1期28卷 46-57页

作者： Arman HADDADCHI mohammad H.OMID amir A.SDEHGHANI School of Environmental and Rural Science University of New England Dept.of Irrigation and Reclamation Engineering University of Tehran

Field experiments were conducted on total load transport in the Chelichay River Basin,a mountainous catchment （1,400 km;） located in north eastern of Iran,to evaluate total load formulas including four gravel bed rivers and a sand bed river（Qaresoo River）.Gravel bed rivers in Chelichay River Basin can be grouped into two types;steep slope rivers with high shear values（Chehelchay River and Khormaloo River） and mild slope rivers with low shear values（Narmab River and Soosara River）.Two depth integrating suspended load samplers（DH-48 and D-49）,and two bed load samplers（Helley-Smith and BLSH） were used to measure total *** performance is tested of 8 total load transport formulae including 4 macroscopic and 4 microscopic methods.A systematic and thorough analysis of 59 sets of data collected from sand bed river indicate that Yang and Engelund and Hansen reach to the better results, and from four gravel bed rivers confirmed that the methods of Karim and Kennedy and Engelund and Hansen yields the best results for steep slope rivers,and the methods of Einstein and Bijker are ranked highest in gradual slope rivers.

关键词： Sediment Total Load Gravel Sampling

Comparison between Emergency Severity Index and Heart Failure Triage Scale in heart failure patients: A randomized clinical trial

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World Journal of Emergency Medicine 2019年第4期10卷 215-221页

作者： Ahmad Pouyamehr amir Mirhaghi mohammad Davood Sharifi Ali Eshraghi Nursing and Midwifery Care Research Center Mashhad University of Medical SciencesMashhadIran Department of Medical-Surgical Nursing School of Nursing and MidwiferyMashhad University of Medical SciencesMashhadIran Department of Emergency Medicine Faculty of MedicineMashhad University of Medical SciencesMashhadIran Department of Cardiology Faculty of MedicineMashhad University of Medical SciencesMashhadIran

BACKGROUND:It is not clear whether Emergency Severity Index(ESI)is valid to triage heart failure(HF)patients and if HF patients benefi t more from a customized triage scale or *** aim of study is to compare the effect of Heart Failure Triage Scale(HFTS)and ESI on mistriage among patients with HF who present to the emergency department(ED).METHODS:A randomized clinical trial was conducted from April to June *** patients with dyspnea were randomly assigned to HFTS or ESI *** level,used resources and time to electrocardiogram(ECG)were compared between both groups among HF patients who were admitted to coronary care unit(CCU),cardiac unit(CU)and discharged patients from the *** validity was examined using Kappa designating agreement on relevance(K*).Reliability of both scale was evaluated using inter-observer agreement(Kappa).RESULTS:Seventy-three and 74 HF patients were assigned to HFTS and ESI groups *** to ECG in HFTS group was signifi cantly shorter than that of ESI group(2.05 vs.16.82 minutes).Triage level between HFTS and ESI groups was signifi cantly different among patients admitted to CCU(1.0 vs.2.8),cardiac unit(2.26 vs.3.06)and discharged patients from the ED(3.53 vs.2.86).Used resources in HFTS group was significantly different among triage levels(H=25.89;df=3;P<0.001).CONCLUSION:HFTS is associated with less mistriage than ESI for triaging HF *** is recommended to make use of HFTS to triage HF patients in the ED.

关键词： Dyspnea Heart failure Triage Emergency severity index

Flow injection spectrophotometric determination of vitamin E in pharmaceuticals,milk powder and blood serum using potassium ferricyanide-Fe(Ⅲ) detection system

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Chinese Chemical Letters 2010年第6期21卷 712-715页

作者： Saima Jadoon amir Waseem mohammad Yaqoob Abdul Nabi Department of Chemistry University of BalochistanQuettaPakistan

A simple and sensitive flow injection spectrophotometric method is reported for the determination of vitamin E using potassium ferricyanide-Fe(Ⅲ) detection *** the presence of vitamin E,Fe(Ⅲ)/ferricyanide *** in situ reduced ions are then reacted with unreduced portion of ferricyanide/Fe(Ⅲ) to make soluble Prussian blue,which is monitored at absorption wavelength of 735 *** calibration graph was obtained in the concentration range of 0.1-40μg mL^(-1).The relative standard deviations (n=4) were in the range of 1.1-3.6%,with limits of detection(3 s blank) of 0.04μg mL^(-1).The proposed method allowed 12 injections h^(-1).The method is applied to determine vitamin E in pharmaceuticals,infant milk and blood serum samples using hexane extraction with the recoveries in the range of 93±3 to 97.5±4%.The method is validated using certified reference materials SRM 968c for blood serum samples.

关键词： Flow injection Spectrophotometry Vitamin E Prussian blue Fe(III) Ferricyanide Pharmaceuticals Blood serum

Synthesis of iron oxide nanoparticles via sonochemical method and their characterization

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Particuology 2011年第1期9卷 95-99页

作者： amir Hassanjani-Roshan mohammad Reza Vaezi Ali Shokuhfar Zohreh Rajabali Engineering Department Islamic Azad University Karaj Branch Karaj Iran Division of Advanced Materials Materials and Energy Research Center Karaj Iran Advanced Materials and Nanotechnology Research Center Faculty of Mechanical Engineering K.N. Toosi University of Technology Tehran Iran

Preparation of iron oxide （α-Fe2O3） nanoparticles was carried out via a sonochemical process. The process parameters sucb as temperature, sonication time and power of ultrasonication play important roles in the size and morphology of the final products. The iron oxide nanoparticles were characterized by trans- mission electron microscopy, X-ray powder diffraction, and thermogravimetric and differential thermal analyses. From transmission electron microscopy observations, the size of the iron oxide nanoparticles is estimated to be significantly smaller than 19 nm. X-ray diffraction data of the powder after annealing provide direct evidence that the iron oxide was formed during the sonochemical process.

关键词： Sonochemical Nanoparticles Iron oxides Hematite

Cholangitis:Diagnosis,Treatment and Prognosis

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Journal of Clinical and Translational Hepatology 2017年第4期5卷 404-413页

作者： amir Houshang mohammad Alizadeh Taleghani Hospital Shahid Beheshti University of Medical SciencesTehranIran

Cholangitis is a serious life-threatening situation affecting the hepatobiliary *** review provides an update regarding the clinical and pathological features of various forms of cholangitis.A comprehensive search was performed in the PubMed,Scopus,and Web of Knowledge *** was found that the etiology and pathogenesis of cholangitis are *** can be categorized as primary sclerosing(PSC),secondary(acute)cholangitis,and a recently characterized form,known as IgG4-associated cholangitis(IAC).Roles of genetic and acquired factors have been noted in development of various forms of *** commonly follows a chronic and progressive course that may terminate in hepatobiliary *** particular,PSC commonly has been associated with inflammatory bowel *** infections are known as the most common cause for *** the other hand,IAC has been commonly encountered along with *** evaluation of the hepatobiliary system has emerged as a crucial tool in the management of *** retrograde cholangiography,magnetic resonance cholangiopancreatography and endoscopic ultrasonography comprise three of the modalities that are frequently exploited as both diagnostic and therapeutic *** drainage procedures using these methods is necessary for controlling the progression of *** results have been reported for the role of antibiotic treatment in management of AC and PSC;however,immunosuppressive drugs have also rendered clinical responses in *** respect to the high rate of complications,surgical interventions in patients with cholangitis are generally restricted to those patients in whom other therapeutic approaches have failed.

关键词： Primary sclerosing cholangitis Acute cholangitis IgG4-associated cholangitis Endoscopic retrograde cholangiography Magnetic resonance cholangiopancreatography Endoscopic ultrasonography