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RISS 인기검색어
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- 저자 : Mehrparvar, Amir Houshang (검색결과 4 건)
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Alisa Mehrparvar,Ahmad Rahimpour 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
In this study, new polymeric material namely polyether sulfone amide (PESA) containing hydrophilegroup was synthesized via polycondensation reaction of diamine with dicarboxylic acid. SynthesizedPESA was used as main polymer to fabrication of novel PESA UF membranes to improve the membraneproperties especially in view of fouling reduction. The PESA membrane was modified by grafting twohydrophilic monomers i.e. 3,5-diaminobenzoic acid (DBA) and gallic acid (GA) via interfacialpolymerization. The prepared membranes were characterized by contact angle measurement,equilibrium water content (EWC), scanning electron microscopy (SEM), atomic force microscopy(AFM), FTIR-ATR analyses. Membrane performance was evaluated by measuring the pure water flux andhumic acid (HA) solute separation with dead-end filtration system. As a result, the contact anglemeasurement showed that the PESA membrane had high hydrophilic surface. Also, super hydrophilicsurfaces were introduced by grafting DBA and GA on the surface of PESA membrane. The SEM imagesproved the formation of large finger-likes in the sublayer for PESA membrane. Filtration tests showedthat pure water flux and HA solution flux of the PESA membranes were higher in comparison to the PESmembrane. Although fluxes were obviously decreased after grafting monomers onto the PESAmembrane surface, higher HA separation efficiency was achieved. Meanwhile fouling tendency wasdecreased. All these results indicated that the new PESA modified membranes showed superiorperformance compared to the PES membrane. Furthermore, GA was found to be the most effectivehydrophilic monomer to improve the membrane hydrophilicity and fouling resistibility.
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S.A.M. Ghannadpour,M. Mehrparvar 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.2
The aim of this study is to obtain the nonlinear and post-buckling responses of relatively thick functionally graded plates with oblique elliptical cutouts using a new semi-analytical approach. To model the oblique elliptical hole in a FGM plate, six plate-elements are used and the connection between these elements is provided by the well-known Penalty method. Therefore, the semi-analytical technique used in this paper is known as the plate assembly technique. In order to take into account for functionality of the material in a perforated plate, the volume fraction of the material constituents follows a simple power law distribution. Since the FGM perforated plates are relatively thick in this research, the structural model is assumed to be the first order shear deformation theory and Von-Karman’s assumptions are used to incorporate geometric nonlinearity. The equilibrium equations for FGM plates containing elliptical holes are obtained by the principle of minimum of total potential energy. The obtained nonlinear equilibrium equations are solved numerically using the quadratic extrapolation technique. Various sets of boundary conditions for FGM plates and different cutout sizes and orientations are assumed here and their effects on nonlinear response of plates under compressive loads are examined.
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Evaluation of a new proposed seismic isolator for low rise masonry structures
Habibollah Kakolvand,Mohammad Ghazi,Behnam Mehrparvar,Soroush Parvizi 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.4
Low rise masonry structures are relatively inexpensive and easier to construct compared to other types of structures such as steel and reinforced concrete buildings. However, masonry structures are relatively heavier and less ductile and more vulnerable to damages in earthquakes. In this research, a new innovative low-cost seismic isolator using steel rings (SISR) is employed to reduce the seismic vulnerability of masonry structures. FEA of a masonry structure, made of concrete blocks is used to evaluate the effect of the proposed SISR on the seismic response of the structure. Two systems, fixed base and isolated from the base with the proposed SISRs, are considered. Micro-element approach and ABAQUS software are used for structural modeling. The nonlinear structural parameters of the SISRs, extracted from a recent experimental study by the authors, are used in numerical modeling. The masonry structure is studied in two separate modes, fixed base and isolated base with the proposed SISRs, under Erzincan and Imperial Valley-06 earthquakes. The accelerated response at the roof level, as well as the deformation in the masonry walls, are the parameters to assess the effect of the proposed SISRs. The results show a highly improved performance of the masonry structure with the SISRs.
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Age-, sex-, and height-based blood pressure reference charts, Yazd children 6-18 years, Iran
ahmadi, Nastaran,Namayandeh, Seyedeh Mahdieh,Bafghi, Seyed Mahmood Sadr,Mohammadi, Mohammad Reza,Mirzaei, Masoud,Sarebanhassanabadi, Mohammadtaghi,Mehrparvar, Amir Houshang,Faraji, Reza,Nilforoshan, N The Korean Pediatric Society 2020 Clinical and Experimental Pediatrics (CEP) Vol.63 No.8
Background: Pediatric hypertension is the main cause of morbidity and mortality in pediatric populations. Purpose: To examine pediatric hypertension in a clinical setting, we used the percentile rank approach and defined hypertension as that above the 95th percentile. Methods: The present study was linked to the a national analytical cross-sectional community-based Iranian Children and Adolescents' Psychiatric Disorders (IRCAP) survey. The survey was nationwide and funded by the National Institute of Medical Research Development. The IRCAP survey included 31,000 children and adolescents aged 6-18 years in all 31 Iran provinces. The current study included 1,035 children and adolescents and linked the data of the risk factors of cardiovascular disease only in Yazd province via random cluster sampling. Results: Of the total participants, 456 (44.1%) were male and 579 (55.9%) were female. The mean age was 11.2±3.8 years (11.7±3.7 years for males, 11.0±3.6 years for females), while mean height was 146±20.0 cm overall, 147.2±22.0 cm for males, and 144.6±17.0 cm for females (P=0.009). The blood pressure distributions and percentiles were evaluated. Conclusion: Here we determined age- and height-specific 50th, 90th, 95th, and 99th percentiles of systolic and diastolic blood pressures in Yazd boys and girls using 10-cm height intervals.
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