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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Ali Vakili (검색결과 5 건)
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Creep analysis of adhesively bonded single lap joint using finite element method
Mohammad Zehsaz,Farid Vakili-Tahami,Mohammad-Ali Saeimi-Sadigh 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
Adhesive joints are being used widely in engineering industries due to the increasing demand for designing lightweight structures. Becauseof the physical properties of the most adhesives, they creep even at room temperature. Therefore, the creep behavior of a single lapadhesive joint is studied in this paper. For this purpose, using the experimental data, creep constitutive equations for the adhesive hasbeen obtained. Then, these equations have been employed to investigate the creep behavior of the joint. The results show that due to thecreep straining, the stresses in the joint corners, decrease. However, creep strain accumulates in these areas which this in turn may lead toseparation of adhesive from adherent. In order to eliminate the effect of strain accumulation, two modifying methods have been proposedin this paper: increasing the layer thickness and using filleted joints.
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Predictors of Colorectal Cancer Survival in Golestan, Iran: A Population-based Study
Mohammad Aryaie,Gholamreza Roshandel,Shahryar Semnani,Mohsen Asadi-Lari,Mohsen Aarabi,Mohammad Ali Vakili,Vahideh Kazemnejhad,Seyed Mehdi Sedaghat,Masoud Solaymani-Dodaran 한국역학회 2013 Epidemiology and Health Vol.35 No.-
OBJECTIVES: We aimed to investigate factors associated with colorectal cancer survival in Golestan, Iran. METHODS: We used a population based cancer registry to recruit study subjects. All patients registered since 2004 were contacted and data were collected using structured questionnaires and trained interviewers. All the existing evidences to determine the stage of the cancer were also collected. The time from first diagnosis to death was compared in patients according to their stage of cancer using the Kaplan-Meir method. A Cox proportional hazard model was built to examine their survival experience by taking into account other covariates. RESULTS: Out of a total of 345 subjects, 227 were traced. Median age of the subjects was 54 and more than 42% were under 50 years old. We found 132 deaths among these patients, 5 of which were non-colorectal related deaths. The median survival time for the entire cohort was 3.56 years. A borderline significant difference in survival experience was detected for ethnicity (log rank test, p=0.053). Using Cox proportional hazard modeling, only cancer stage remained significantly associated with time of death in the final model. CONCLUSIONS: Colorectal cancer occurs at a younger age among people living in Golestan province. A very young age at presentation and what appears to be a high proportion of patients presenting with late stage in this area suggest this population might benefit substantially from early diagnoses by introducing age adapted screening programs.
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Mohammad Ali Semsarzadeh,Eshagh Vakili,Behnam Ghalei,Milad Fardi,Mojtaba Esmaeeli 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
Mixed matrix membranes of synthesized polyurethane (PU) based on toluene diisocyanate (TDI), polydimethylsiloxane(PDMS) and polytetramethylene glycol (PTMG) with polyvinyl alcohol based polar silica particles wereprepared by solution casting technique. The homogeneity and thermal properties of the prepared PDMS-PU/silica membraneswere characterized using scanning electron microscope (SEM), differential scanning calorimetry (DSC) andthermal gravimetric analysis (TGA). The SEM micrographs confirmed the distribution of silica particles in the polymermatrix without agglomerations. Gas permeation properties of membranes with different silica contents were studiedfor pure CO2, CH4, O2, He and N2 gases. The obtained results indicated the permeability of the condensable and polarCO2 gas was enhanced whereas permeability of other gases decreased upon increasing the silica content of the mixedmatrix membranes. The permeability of CO2 and its selectivity over N2 was increased from 68.4 Barrer and 22 in purePDMS-PU to 96.7 Barrer and 64.4 in the mixed matrix membranes containing 10 wt% of the silica particles.
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Nabi, Ali,Khalili, Mohammad Bagher,Eslami, Gilda,Vakili, Mahmood,Anbari, Fatemeh,Torki, Alireza The Korean Society for Reproductive Medicine 2022 Clinical and Experimental Reproductive Medicine Vol.49 No.1
Objective: Male genital tract infections have been associated with infertility, and Escherichia coli has drawn increasing attention as an important bacterium in this context. This investigation aimed to characterize and compare the distributions of O-antigen serogroups of E. coli in the semen samples of fertile and infertile men. Methods: In this case-control study, semen samples were collected from 618 fertile and 1,535 infertile men. The E. coli-positive samples were evaluated in terms of concentration, morphology, viability, and motility parameters according to the World Health Organization 2010 guidelines. Finally, different serogroups of E. coli were identified by multiplex polymerase chain reaction targeting the O-antigen variations of the bacterium. Results: The prevalence of E. coli among fertile men was significantly higher than among infertile men (p<0.001). The sperm morphology, viability, and motility in the E. coli-positive fertile group were significantly higher than in the E. coli-positive infertile group (p<0.001). E. coli O6 was the most prevalent serogroup found in both groups. However, there was no significant difference in the frequency of different serogroups of E. coil between the two groups (p=0.55). Conclusion: Despite the higher prevalence of E. coli among fertile men, E. coli had more detrimental effects on semen parameters in infertile men. There was no significant difference in E. coli serogroups between the fertile and infertile groups.
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Farid Vakili-Tahami,Mohammad Zehsaz,Mahdi Mohammadpour,Ali Vakili-Tahami 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
Butterfly valves are widely used in various industries such as water distribution, sewage, oil and gas plants. The hydrodynamic torque applied on the butterfly valve disk is one of the most important factors which should be considered in their design and application. Although several methods have been used to calculate the total torque on these valves, most of them are based on hydrostatic analysis and ignore the hydrodynamic effect which has a major role to determine the torque of the large-size valves. For finding the dynamic-valvetorque,some empirical formulas and methods have been proposed; for example in AWWA C504 standard, a relationship for calculating the dynamic torque has been given and its variation versus disk angle has been stated. However, the use of these empirical relationships is restricted due to the conditions defined in the standards. In this paper, the dynamic-valve-torque has been calculated for a large butterfly valve under different conditions and also at the different opening angles of the valve disk. For this purpose a computational fluid dynamics (CFD) method has been used. The results have been compared with those given in the AWWA C504 standard recommendations. Moreover, the effects of the disk shape and its deformation, surface roughness, upstream/downstream pressure variation and disk-offset value have been studied.
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