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Gh.R. Atefatdoost,H. Shakib,B. JavidSharifi 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.63 No.3
Architecture constraints in buildings may typically cause irregularities in the distribution of stiffness and mass and consequently causes non-compliance of centers of mass, stiffness and strength. Such buildings are known as asymmetric buildings the distribution of strength and stiffness is one of whose main challenges. This distribution is more complicated for concrete buildings with RC shear walls in which stiffness and strength are interdependent parameters. The flexibility under the foundation is another subject that can affect this distribution due to the variation of dynamic properties of the structure and its constituting elements. In this paper, it is attempted to achieve an appropriate distribution pattern by expressing the effects of foundation flexibility on the seismic demand of concrete shear walls and also evaluate the effects of this issue on strength and stiffness distribution among lateral force resistant elements. In order to understand the importance of flexibility in strength and stiffness distribution for an asymmetric building in different conditions of under-foundation flexibility, the assigned value to each of the walls is numerically calculated and eventually a procedure for strength and stiffness distribution dependencies on flexibility is provided.
A Case of Paracentric Inversion of Chromosome 18 (q21.1q22.1)
( Gh An ),( Kh Choi ),( My Kim ),( Jy Han ),( Hk Ahn ),( Jh Chung ),( Mh Kim ),( Sw Lee ),( Yj Han ),( Dw Kwak ),( Yh Chae ),( Sy Park ),( Hm Ryu ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
We report on a case with a paracentric inversion of the long arm of chromosome 18: 46,XX,inv(18)(q21.1q22.1). A karyotype 46.XX.add(18) was found during antenatal diagnosis (amniocentesis) performed at local clinic because of advanced maternal age (38 years). And the pregnant woman visited our hospital at 18.4 weeks to confirm the result. We performed the amniocentesis and found the karyotype 46,XX,inv(18)(q21.1q22.1). The inversion was also found in the mother and the maternal grandmother of the fetus by chromosome studies from peripheral blood . The high resolution ultrasonography performed at 20.5 weeks showed normal findings. The diagnosis of paracentric inversion can be difficult and might be incorrect because of the variety of unpredictable unbalanced chromosome products that can result from a paracentric inversion. The vast majority of paracentric inversions are likely to be harmless. The risk of having an abnormal child for carriers of paracentric inversions is expected to be low. but sometimes by the variation of breakpoint or recombination process, various clinical phenotype can be seen : 18q- syndrome including: microcephaly, epicanthal folds, midface hypoplasia, and abnormally modeled ears, dermatoglyphic whorls on fingertips, clubfeet, hearing loss, and developmental delay. The mother is now ongoing pregnant state and the baby needs long term follow up after birth. This report underlines the importance of careful antenatal diagnosis and genetic counseling for parental and fetal paracentric inversion.
Gh. Dehghan Khalili,S. Alipour,M. R. Akbarpour,S. Moniri Javadhesari 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.8
In this study, copper oxide (CuO) nanoparticles were incorporate within polyvinyl alcohol (PVA) matrix and CuO–PVAnanocomposite film was fabricated by solution casting technique. In order to synthesize nanoparticles, a cost-competitive andfacile approach namely mechanochemical method was implemented. As nanoparticles precursors, pre-determined amountof CuSO4,NaCl, and NaOH were mixed. The mixture was ball-milled in zirconia medium for 10 h at ambient temperatureand rotational speed of 300 rpm. The XRD characterization analysis indicated CuO nanoparticles formation by ball milling. The CuO size was estimated to be in the ≈ 37 nm range. SEM images demonstrated the spherical morphology andlittle agglomeration for the nanoparticles. Furthermore, the bandgap energy of CuO was determined to be 1.84 eV. TheCuO content in the nanocomposite was set to be 2, 4, 8, and 10 wt%. Strong interaction between the PVA matrix and CuOnanofiller was confirmed by XRD and FT-IR investigations. Moreover, integration of CuO to the polymer matrix resultedin a decreased PVA crystallinity. The antibacterial behavior of PVA was increased by the addition of nanoparticles, and theCuO–PVA nanocomposite containing up to 4 wt% CuO had desirable antibacterial properties demonstrated against Escherichiacoli activity. CuO nanoparticles incorporating to PVA network led to reinforced mechanical and dielectric propertiesfor the nanocomposites. Besides, nanoparticles loading had direct impact on the intensified properties. Tensile strength wasenhanced from 85.8 (pure PVA) to 154.9 MPa (PVA-10 wt% CuO). The tensile modulus for neat PVA was 0.9 GPa andraised dramatically to 4.5 GPa for PVA-10 wt% CuO. Dielectric constant also improved more than three times at 1 kHzcomparing PVA and PVA-10 wt% CuO.
Out of plane behavior of walls, using rigid block concepts
Gh.M, Mohammadi,F, Yasrebi Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.3
Out of plane behaviors of walls and infills are investigated in this paper, using rigid block concepts. Walls and infills are sometimes separated from top beams because of in plane movement of the walls and crumbling mortar layers under the top beams. Therefore, sufficient strength should be supplied to hold them against out of plane forces. Such walls are studied here under some real and scaled earthquakes, regarding their out of plane behavior. Influences of some reinforcements, connecting the walls to frames or perpendicular walls, are also studied. It is shown that unreinforced walls of regular sizes (3 m high and 4.5 m long) are normally unstable in the earthquakes. However, performing some reinforced bars that connect them to adjacent elements- frames or perpendicular walls - stabilizes them. Eventually, it is concluded that supplying 3 reinforced bars at 1/4, 2/4 and 3/4 of the panel's height stabilizes the walls in the assumed earthquakes. In this regard, for 20 cm and 35 cm thick walls ${\Phi}$18mm and ${\Phi}$20mm bars are to be used, respectively. For walls with other configurations, the forces and required areas of the reinforcements can be determined by the developed method of this paper.
Gh. E. Mostafa 경남대학교 기초과학연구소 2020 Nonlinear Functional Analysis and Applications Vol.25 No.4
In this paper, we introduce the finite element method and solve the boundary control problem governed by parabolic variational inequalities with an infinite number ofvariables by using this method.
Investigation of the semi-active electromagnetic damper
Montazeri-Gh, Morteza,Kavianipour, Omid Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.3
In this paper, the electromagnetic damper (EMD), which is composed of a permanent-magnet rotary DC motor, a ball screw and a nut, is considered to be analyzed as a semi-active damper. The main objective pursued in the paper is to study the two degrees of freedom (DOF) model of the semi-active electromagnetic suspension system (SAEMSS) performance and energy regeneration controlled by on-off and continuous damping control strategies. The nonlinear equations of the SAEMSS must therefore be extracted. The effects of the EMD characteristics on ride comfort, handling performance and road holding for the passive electromagnetic suspension system (PEMSS) are first analyzed and damping control strategies effects on the SAEMSS performance and energy regeneration are investigated next. The results obtained from the simulation show that the SAEMSS provides better performance and more energy regeneration than the PEMSS. Moreover, the results reveal that the on-off hybrid control strategy leads to better performance in comparison with the continuous skyhook control strategy, however, the energy regeneration of the continuous skyhook control strategy is more than that of the on-off hybrid control strategy (except for on-off skyhook control strategy).