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RISS 인기검색어
- 검색키워드
- 저자 : Masoud Emamy (검색결과 4 건)
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Mitigation of progressive collapse in steel structures using a new passive connection
Masoud Mirtaheri,Fereshteh Emami,Mohammad A. Zoghi,Mojtaba Salkhordeh 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.4
If an alternative path would not be considered for redistribution of loads, local failure in structures will be followed by a progressive collapse. When a vertical load-bearing element of a steel structure fails, the beams connected to it will lose their support. Accordingly, an increase in span\'s length adds to the internal forces in beams. The mentioned increasing load in beams leads to amplifying the moments there, and likewise in their corresponding connections. Since it is not possible to reinforce all the elements of the structure against this phenomenon, it seems rational to use other technics like specified strengthened connections. In this study, a novel connection is suggested to handle the stated phenomenon which is introduced as a passive connection. This connection enables the structure to tolerate the added loads after failing of the vertical element. To that end, two experimental models were constructed and thereafter tested in half-scale, one-story, double-bay, and bolted connections in three-dimensional spaces. This experimental study has been conducted to compare the ductility and strength of a frame that has ordinary rigid connections with a frame containing a novel passive connection. At last, parametric studies have been implemented to optimize the dimensions of the passive connection. Results show that the load-bearing capacity of the frame increased up to 75 percent. Also, a significant decrease in the displacement of the node wherein the column is removed was observed compared to the ordinary moment resisting frame with the same loads.
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SSR Alleviation in SCIG-Based Wind Power Plants Using Resistive Bridge-Type FCL
Koochaki Amangaldi,Yashar Emami,Radmehr Masoud 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
Series-Compensated Transmission Lines (SCTLs) are widely used for connection of large scale wind power plants (WPPs) to the power system to transmit the active power generated from WPPs. However, it can lead to sub synchronous resonance (SSR) phenomena in WPPs connected with SCTLs. Also, capacitive compensation of transmission lines reduces the line impedance, which leads to increasing short circuit current level in WPPs. This study proposes the resistive bridge-type fault current limiter (RBFCL) for SSR mitigation and limiting short circuit current in WPPs connected with SCTLs. Also, its performance is compared with the static synchronous compensator (STATCOM) and thyristor controlled series capacitor (TCSC) to demonstrate the eff ectiveness of the RBFCL in terms of SSR mitigation. The WPP used in this paper is modelled based on an aggregated squirrel-cage induction generator (SCIG) derived by an aggregated wind turbine (WT). The PSCAD/EMTDC software and the IEEE fi rst benchmark model are used for this study. Simulation results demonstrate that the RBFCL not only limits the short circuit current contribution of WPPs, but also eff ectively damps the SSR oscillations due to IGE as well as TI, when the WPP is subjected to a large disturbance
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Microstructure and Tensile Properties of Mg–5Zn Alloy Containing Ca
Elaheh Maleki,Farzad Shahri,Masoud Emamy 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
The present study aimed at investigating the effect of Ca (0–3 wt%) on the microstructure and tensile properties of as-castand as-extruded Mg–Zn alloy, in which tensile tests, X-ray diffraction, SEM, EDX and texture analysis were used to evaluatethese features. Based on the results obtained, it is shown that the average grain size decreased from 305 to 84 μm byadding 3 wt% Ca to the as-cast Mg–Zn alloy. XRD and SEM results reveal that the dominant second phase in the presenceof Ca is Ca2Mg6Zn3which is formed continuously between dendrite arms spacing. It has been observed that the additionof 0.1 wt% Ca, significantly enhanced both UTS and elongation of as-cast alloy. It is found that the size of DRXed grainsdecreases with the increase of Ca (4 μm with 3 wt% Ca addition) after hot-extrusion. Further, it has been observed thatUltimate tensile strength (UTS) and elongation values of extruded alloys containing Ca are enhanced and the best result isobtained for Mg–5Zn–0.1Ca sample. Ultimate tensile strength (UTS) of 351 MPa and elongation percentage of 24% areobtained for Mg–5Zn–0.1Ca extruded alloy.
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Novel Copper(Ⅱ)-Selective Senor Based on a New Hexadentates Schiff's Base
Ganjali, Mohammad Reza,Emami, Mehdi,Salavati Niasari, Masoud Korean Chemical Society 2002 Bulletin of the Korean Chemical Society Vol.23 No.10
A novel copper(II) membrane electrode based on diphenylisocyanate bis(acetylacetone) ethylenediimine (DIBAE), as a new hexadentates Schiff's base was prepared. The electrode exhibited a Nernstian response for Cu$^{2+}$ ions over a wide concentration range (1.0 ${\times}$ 10$^{-1}$ to 1.0 ${\times}$ l0$^{-6}$ M) with a limit of detection of 6.0 ${\times}$ 10$^{-7}$ M (39 ppb). The sensor shows a fast response time (15s) and the membrane can be used for more than 4 months without observing any major deviation. The electrode revealed very good selectivity with respect to many cations including alkali, alkaline earth, transition and heavy metal ions. The proposed sensor could be used in a pH range of 3.0-7.5. It was applied to the direct potentiometric determination of copper in black tea, and in wastewater of copper electroplating samples. The electrode was also used in potentiometric titration of the copper(II) ion with EDTA.
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