http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Morshedi, Sadjad (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
-
A simple panel zone model for linear analysis of steel moment frames
Hamed Saffari,Esmaeil Morshedi 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.4
Consideration of the panel zone (PZ) deformations in the analysis of steel moment frames (SMFs) has a substantial effect on structural response. One way to include the PZ effect on the structural response is Krawinkler’s PZ model, which is one of the best and conventional models. However, modeling of Krawinkler’s PZ model has its complexity, and finding an alternative procedure for PZ modeling is of interest. In this study, an efficient model is proposed to simplify Krawinkler’s PZ model into an Adjusted Rigid-End Zone (AREZ). In this way, the rigid-end-zone dimensions of the beam and column elements are defined through an appropriate rigid-end-zone factor. The dimensions of this region depend on the PZ stiffness, beam(s) and columns’ specifications, and connection joint configuration. Thus, to obtain a relationship for the AREZ model, which yields the dimensions of the rigid-end zone, the story drift of an SMF with Krawinkler’s PZ model is equalized with the story drift of the same structure with the AREZ model. Then, the degree of accuracy of the resulting relationship is examined in several connections of generic SMFs. Also, in order to demonstrate the applicability of the proposed model in SMFs, several SMFs ranging from 3- to 30-story representing low- to high-rise buildings are examined through linear static and dynamic time history analysis. Furthermore, non-linear dynamic analyses of three SMFs conducted to validate the degree of accuracy of the proposed model in the non-linear analysis of SMFs. Analytical results show that there is considerable conformity between inter-story drift ratio (IDR) results of the SMFs with Krawinkler’s PZ model and those of the centerline SMFs with AREZ.
-
Takbash, Majid Reza,Morshedi, Abbas Ali Akbarzadeh,Sabet, Seyyed Ali Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.5
The current experimental study is the reinforcement of the simple curvature vault masonry structures. In this study, we discuss complex structure include vault and rib cover with two radii and actual dimensions under a vertical load. The unreinforced structure data were compared with analysis data. The analysis data are in good agreement with experimental data. In the first experiment, a structure without reinforcement is tested and according to the test results, the second structure was reinforced using the carbon polymer fibers and the same test is done to see the effects of reinforcement. Based on the test results of the first structure, the first cracks are created in the vault. Moreover, the reinforcement with carbon fibers will increase the loading capacity of the structure around 35%.
-
Photo bleaching of wool using nano TiO2 under daylight irradiation
Majid Montazer,Somaye Morshedi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
Wool bleaching is usually carried out on raw wool through treatment with oxidizing or reducing agents. Here, nano TiO2 as a photocatalyst was applied on raw wool fabric to decompose the naturally occurredpigments under daylight irradiation. To enhance nano particles adsorption on the fabric, it was firsttreated with protease and then treated with nano TiO2 along with citric acid. The whiteness andyellowness indexes and hydrophilicity features of the treated wool fabrics indicated a reasonablewhiteness with a significant improved hydrophilicity. This new wool bleaching approach was named as‘‘nano photo bleaching’’ as a most successful bleaching application.
-
A novel nanocomposite as adsorbent for formaldehyde removal from aqueous solution
Hejri, Zahra,Hejri, Mehri,Omidvar, Maryam,Morshedi, Sadjad Techno-Press 2020 Advances in nano research Vol.8 No.1
In order to develop a new adsorbent for removal of formaldehyde from aqueous solution, surface modification of TiO<sub>2</sub> nanoparticles was performed with 2,4-Dinitrophenylhydrazine (DNPH) that have a strong affinity to the formaldehyde. Sodium dodecyl sulfate (SDS) surfactant was used to improve the DNPH grafting to TiO<sub>2</sub> surface. Modified adsorbents were characterized by SEM, TEM, XRD, EDX and FTIR. Since the COD level in wastewaters including formaldehyde is considerable, it is necessary to determine the COD content of the synthetic wastewater. In order to determine the optimal removal conditions, the effect of contact time (60-210 min), pH (4-10) and adsorbent dosage (0.5-1.5 g/L) on adsorption and COD removal efficiencies were studied, using response surface method. EDX and FTIR analysis confirmed the presence of nitrogen-containing functional groups on the modified TiO<sub>2</sub> surface. The maximum formaldehyde adsorption and COD removal efficiencies by modified TiO<sub>2</sub> were about 15.65 and 7.35% higher than the unmodified nanoparticles respectively. Therefore, the grafting of nano-TiO<sub>2</sub> with DNPH would greatly improve its formaldehyde adsorption efficiency. The optimum conditions determined for a maximum formaldehyde removal of 99.904% and a COD reduction of 94.815% by TiO<sub>2</sub>/SDS/DNPH nanocomposites were: adsorbent dosage 1.100 g/L, pH 7.424 and the contact time 183.290 min.
-
Majid Reza Takbash,Abbas Ali Akbarzadeh Morshedi,Seyyed Ali Sabet 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.5
The current experimental study is the reinforcement of the simple curvature vault masonry structures. In this study, we discuss complex structure include vault and rib cover with two radii and actual dimensions under a vertical load. The unreinforced structure data were compared with analysis data. The analysis data are in good agreement with experimental data. In the first experiment, a structure without reinforcement is tested and according to the test results, the second structure was reinforced using the carbon polymer fibers and the same test is done to see the effects of reinforcement. Based on the test results of the first structure, the first cracks are created in the vault. Moreover, the reinforcement with carbon fibers will increase the loading capacity of the structure around 35%.
-
Thermal Hydraulic Analysis of Core Flow Bypass in a Typical Research Reactor
Said M.A. Ibrahim,Salah El-Din El-Morshedy,Abdelfatah Abdelmaksoud 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.1
The main objective of nuclear reactor safety is to maintain the nuclear fuel in a thermally safe conditionwith enough safety margins during normal operation and anticipated operational occurrences. In thisresearch, core flow bypass is studied under the conditions of the unavailability of safety systems. As corebypass occurs, the core flow rate is assumed to decrease exponentially with a time constant of 25 s tonew steady state values of 20, 40, 60, and 80% of the nominal core flow rate. The thermal hydraulic codePARET is used through these calculations. Reactor thermal hydraulic stability is reported for all cases ofcore flow bypass.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
