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RISS 인기검색어
- 검색키워드
- 저자 : Etman, Ahmed S. (검색결과 6 건)
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New Route for the Synthesis of 3-Anilino-4-Aryl-Hydrazono-1-Phenyl-2-Pyrazolin-5-Ones
Etman, Hassan-Ali,Sadek, Eman-Galal,Metwally, Mohamed-Abbas The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.1
A convenient route was reported for the synthesis of 3-anilino-4-arylazo-1-phenyl 1-2-pyrazolin-5-ones to improve their yields. The structures of the obtained products were supported by spctral data.
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Synthesis of Some New 4H-(Pyrano and/or Piperidino)[3,2-d] Pyazoles and Pyrazolo[5,4-d] Thiopyrans
Etman, H.A.,El-Ahl, A.S.,Metwally, M.A. The Pharmaceutical Society of Korea 1994 Archives of Pharmacal Research Vol.17 No.4
1,5-diketones(3) undewent cyclization to 4H-pyrano[3,2-d]pyrazoles (4a-d),4H-piperidino[3, 2-d]pyrazole (5) and pyrazolo[5,4-d]thiopyran (6) upon treatment with P/sub 2/O/sub 5/, CH/sub 3/COONH/sub 4/ and /or P/sub 2/S/sub 5/. Moreover, treatment of (4) with CH/sub 3/COONH/sub 4/ and/or P/sub 2/S/sub 5/ afforded (5) and (6). The structures of the hitherto unknown ring systems have been confirmed by analytical and spectral data.
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Ahmed El-Shahat Etman,Asmaa Mohammed Ibrahim,Fatma Al-Zahraa Mostafa Darwish,Khaled Faisal Qasim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.122 No.-
Supercapacitors are one of the most promising technologies to meet the requirements of human sustainabledevelopment, due to their benefits such as high capacitance and rate capability, long cycle life, andlow processing cost. Electrode materials play a decisive role in the performance of supercapacitors, that’swhy many types of research on electrode materials are critical to supercapacitors. As we go forwardtoward highly flexible and bendable electronics. Conducting polymer (CP)-based materials are promisingmaterials in supercapacitors because of their unique advantages including good conductivity, flexibility,relatively cheap, easy synthesis, and so on. This review summarizes recent research progress of CPs (includingpolypyrrole (PPy), polyaniline (PANI), and polythiophene (PTh)), the CP-based composites forsupercapacitors in purpose and concentrating composites’ effect on supercapacitive parameters, besidediffusion mechanism with the calculations of supercapcitive parameters in every technique. Eventually, we give a brief outline of the development directions of CP-based supercapacitors with suggestionsfor the future of supercapacitors based on the last decade’s research.
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Nesreen Kassem,Ahmed Atta,Emad Etman 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.3
Lateral loads annually destroy many reinforced concrete structures in different countries. However, there is a necessary need to retrofit masonry infill walls to utilize them as lateral load resisting elements. For this purpose, an experimental program has been carried out on half scale specimens to characterize the behavior of single story brick masonry in-filled frames under the effect of lateral loads. The effectiveness of different strengthening techniques is investigated using Carbon–fiber Reinforcement Polymer (CFRP). The steel reinforcement at the beam-columns joints of all specimens was detailed as hinged connection. FRP sheets and FRP strips were used as strengthening agents for the tested specimens. They were utilized in two different cases, bonded or unbonded to the masonry wall. In addition, the FRP anchor technique was used to increase the efficiency of bonding the strengthening agents with the frames and the walls. The load– displacement behavior, FRP strain, crack pattern, steel strain, and mode of failure of the tested specimens were investigated. The results showed that the used strengthening methods are effective, with high increase in strength and ductility. In addition, an analytical model was presented and solved. Based on this model, simplified empirical equation to design the required amount of FRP needed to resist lateral loads was proposed. The equation showed a good agreement with both the experimental result and finite element output.
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The Effective Width in Shear Design of Wide-shallow Beams: A Comparative Study
Abd El-Hakim Khalil,Emad Etman,Ahmed Atta,Ahmed Baraghith,Reda Behiry 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.4
In bridges, many architectural constrains lead designers to use wide-shallow beams to support floor loads and transfer forces to columns. An assessment of existing wide-shallow beams in bridges showed that the shear failure is repeatedly governing. This paper provides a comparative study between an experimental research for the shear behavior of wide-shallow beams subjected to static loading and selected on international codes such as the American Association of State Highway and Transportation Officials (AASHTO) practice, the American Concrete Institute (ACI), the Canadian Slandered Association (CSA) and the Euro code (EC2). Seven wide-shallow beams with edge columns were used to investigate the ratios of the beam width to depth (b/d) and the column width to the beam width (c/b) on the performance of shear capacity. The experimental results were presented in terms of deflection, ultimate loads, crack patterns, steel and concrete strains, and shear strain distribution across the width. The results revealed that the shear capacity equations used in the Euro code and the AASHTO are not applicable in wide-shallow beams. An innovated analyticalformula to calculate the shear strength of wide-shallow beams is provided in this research.
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Lin, Jia,Chen, Hong,Gao, Yang,Cai, Yao,Jin, Jianbo,Etman, Ahmed S.,Kang, Joohoon,Lei, Teng,Lin, Zhenni,Folgueras, Maria C.,Quan, Li Na,Kong, Qiao,Sherburne, Matthew,Asta, Mark,Sun, Junliang,Toney, Mic National Academy of Sciences 2019 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.116 No.47
<P><B>Significance</B></P><P>Metal halide perovskites attract great interest for a wide range of applications due to their remarkable optoelectronic properties. The development of environmentally friendly halide perovskite materials with various crystal structures and compositions offers unprecedented opportunities to achieve desired properties and applications. In this work, we demonstrated an In-based, charge-ordered all-inorganic halide double perovskite with the composition of Cs<SUB>2</SUB>In(I)In(III)Cl<SUB>6</SUB> synthesized by solid-state reaction. High-pressure optical properties were studied, and a pressure-driven, fully reversible semiconductor–metal phase transition was discovered. This In-based charge-ordered structure may inspire new understanding of halide perovskite as well as provide a platform for future discovery of exotic electronic phenomena such as high-<I>T</I><SUB>C</SUB> superconductivity in halide perovskite compounds.</P><P>Phase transitions in halide perovskites triggered by external stimuli generate significantly different material properties, providing a great opportunity for broad applications. Here, we demonstrate an In-based, charge-ordered (In<SUP>+</SUP>/In<SUP>3+</SUP>) inorganic halide perovskite with the composition of Cs<SUB>2</SUB>In(I)In(III)Cl<SUB>6</SUB> in which a pressure-driven semiconductor-to-metal phase transition exists. The single crystals, synthesized via a solid-state reaction method, crystallize in a distorted perovskite structure with space group <I>I</I>4/<I>m</I> with <I>a</I> = 17.2604(12) Å, <I>c</I> = 11.0113(16) Å if both the strong reflections and superstructures are considered. The supercell was further confirmed by rotation electron diffraction measurement. The pressure-induced semiconductor-to-metal phase transition was demonstrated by high-pressure Raman and absorbance spectroscopies and was consistent with theoretical modeling. This type of charge-ordered inorganic halide perovskite with a pressure-induced semiconductor-to-metal phase transition may inspire a range of potential applications.</P>
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