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Synthesis of Unsymmetrical Trisannelated Benzenes
Mahmoodi, Nosrat O.,Fatemeh, Mostaghni 대한화학회 2002 대한화학회지 Vol.46 No.1
2,3,4,5,6,7,8,9,10,11-데카하이드로-1H-사이클로펜타[l]페난트렌(1c)과 1,2,3,4,5,6,7,8,9,10-데카하이드로사이클로헥사[e]-as-인다센(1d) 같이 비대칭적으로 삼고리화된 벤젠을 합성하였다. 합성의 접근방법으로 사이클로펜탄온과 사이클로헥산온의 존재하에 무수 를 촉매로 사용하여 미리 형성된 바이사이클로헥실리덴-2-온 (3), 바이사이클로헥실-1''-엔-2-온 (4) 과 바이사이클로펜틸리덴-2-온(5) 같은 엔온들의 효율적인 축합반응을 사용하였다. Synthesis of unsymmetrical trisannelated benzenes such as 2,3,4,5,6,7,8,9,10,11-decahydro-1H-cyclopenta[l]phenanthrene (1c) and 1,2,3,4,5,6,7,8,9,10-decahydrobenz[e]-as-indacene (1d) is described. The synthetic approach involves efficient condensation of pre-formed enones such as bicyclohexyliden-2-one (3), bicyclohexyl-1-en-2-one (4) and bicyclopentyliden-2-one (5) in the presence of cyclopentanone and cyclohexanone using anhydrous as a catalyst.
Structural Effects of Substitutional Impurities on MoO3 Bilayers: A First Principles Study
Tahereh Mahmoodi,Masoud Mansouri 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.9
Energy band-gap engineering via impurity intercalation into the 2-D MoO3 bilayer lattice has been studied using density functional theory calculations, and the effects of various kinds of dopants on the electronic structure have been explored. The dopants were incorporated via both oxygen and molybdenum substitution. The results show that although the MoO3 bilayer is an indirect band-gap semiconductor with zero magnetization, doped molybdenum trioxide experiences a bandgap reduction and a pure magnetization. Based on the calculated results, impurity doping leads to the creation of impurity levels inside the band-gap, and thereby both types of conductivity (n type and p type) can be identified. The calculated impurity formation-energies indicate that Nb and W atoms can be readily incorporated into the MoO3 bilayer.
Saeed Mahmoodi Tabar,Ali Tehranifar,Gholam Hossein Davarynejad,Seyed Hossein Nemati,Hamid Reza Zabihi 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.4
Aril paleness disorder causes the quality depletion of pomegranate fruits. The objective of our work was to determine circumstance of physicochemical changes during the exposure of aril paleness disorder. Disordered fruits were monitored in the 131st days of fruit set. Disordered fruits showed a significant (P ≤ 0.05) difference from intact fruits in fruit density, juice percentage, phenolic compounds, polymeric anthocyanins, titratable acidity, and total soluble solids in the 131st days of fruit set. The fruit density, juice percent, ascorbic acid, phenolic compounds, and titratable acidity decreased 2.91, 13.52, 27.46, 21.48, and 4.22%, respectively, faster than those in intact fruits. Peel percent, dry matter of juice, acidity, total soluble solids and total sugars increased 2.59, 8.13, 3.67, 5.7, and 4.85%, respectively, faster than those in intact fruits. Monomeric anthocyanins increased (200 ㎎/100 g) up to the 159th days of fruit set in intact fruits, followed by decreased 16% up to the 173rd days of fruit set. Disordered fruits showed 70% depletion in monomeric anthocyanins up to the 173rd days of fruit set. Polymeric anthocyanins increased 14.3 and 59.3% in intact fruits and disordered fruits, 14.3 and 59.3%, respectively. Both intact and disordered fruits showed 21.9 and 23.162% increase in protein up to the 159th days of fruit set, followed by a steady state in their rate of accumulation. Physical and chemical properties in both fruits showed no significant changes during the late harvest date (the 166th and 173rd days of fruit set). Exceptions to this general pattern were total soluble solids and dry matter of disordered fruit juice in which increased significantly.
N. Mahmoodi 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.5
In this paper the stable Barium Titanate, BaTiO3, (BTO) sol was prepared at the first stage. The obtained results of the mean size of particles showed that the ratio of precursors and their type had a great effect on the stability of the soil and the properties of the thin films. After adjusting the process parameters, the sol with 10 months stability was acquired. The stable sol consisted of acetic acid, barium acetate, TTIP, 2-propanol and deionized water with 7 : 1 : 1 : 1 : 130 molar ratios, respectively. Then, the optimum sol was deposited on the different substrates such as silicon (001), soda-lime glass and alumina and the effect of substrate type was evaluated on the morphology of the thin film. According to AFM and SEM results, it was found that the substrates obviously influenced the microstructure of BaTiO3 thin films and a smooth crack free surface was obtained.
Khalil Mahmoodi,Leila Nasehi,Elham Karami,Mohammad Soleiman Soltanpour 대한혈관외과학회 2016 Vascular Specialist International Vol.32 No.3
Purpose: The endothelial nitric oxide synthase (eNOS) G894T polymorphismhas been reported to cause endothelial dysfunction and may have a role in thedevelopment of coronary artery disease (CAD). The aim of the present study wasto investigate the association of eNOS G894T genetic polymorphism and plasmalevels of nitric oxide (NO) with CAD risk in an Iranian population. Materials and Methods: We studied 200 patients with angiographicallydocumented CAD and 100 matched controls. Analysis of G894T geneticpolymorphism of eNOS was performed by polymerase chain reaction-restrictionfragment length polymorphism method. Plasma levels of NO were determinedusing Griess method. Biochemical analysis was conducted by routine colorimetricmethods. Results: Plasma levels of NO were significantly lower in CAD patients than controlsubjects (41.60±12.70 vs. 55.48±16.57, P=0.001). Also, the mean plasma levels ofNO were significantly lower in T allele carriers of eNOS G894T polymorphism thanG allele carriers (P<0.001). The genotype distribution and minor T allele frequencyof eNOS G894T polymorphism significantly differed between CAD patients andcontrol subjects (P<0.05). However, no significant association was found betweenthe eNOS G894T polymorphism and the severity of CAD (number of diseasedvessel) or the lipid profile of CAD patients (P>0.05). Conclusion: Reduced plasma level of NO is associated with increased risk of CADin our population. Moreover, eNOS G894T polymorphism is a significant risk factorfor CAD development via reducing the plasma levels of NO. However, eNOS G894Tpolymorphism is not a contributing factor for the severity of CAD.
Seismic fragility analysis of a cemented Sand-gravel dam considering two failure modes
Khadije Mahmoodi,Ali Noorzad,Ahmad Mahboubi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.26 No.6
Dams are vital infrastructures that are expected to maintain their stability during seismic excitations. Accordingly, cemented material dams are an emerging type, which are being increasingly used around the world owing to benefiting from advantages of both earth-fill and concrete gravity dams, which should be designed safely when subjected to strong ground motion. In the present paper, the seismic performance of a cemented sand and gravel (CSG) dam is assessed using incremental dynamic analysis (IDA) method by accounting for two failure modes of tension cracking and base joint sliding considering the dam-reservoir-foundation interactions. To take the seismic uncertainties into account, the dam is analyzed under a suite of ground motion records and then, the effect of friction angle for base sliding as well as deformability of the foundation are investigated on the response of dam. To carry out the analyses, the Cindere dam in Turkey is selected as a case study, and various limit states corresponding to seismic performance levels of the dam are determined aiming to estimate the seismic fragilities. Based on the results, sliding of the Cindere dam could be serious under the maximum credible earthquake (MCE). Besides, dam faces are mostly to be cracked under such level of intensity. Moreover, the results indicate that as friction angle increases, probability of sliding between dam and foundation is reduced whereas, increases tensile cracking. Lastly, it is observed that foundation stiffening increases the probability of dam sliding but, reduces the tensile damage in the dam body.
S. Mahmoodi,M.R. Ehsani,S.M. Ghoreishi 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
The M–Na–Mn/SiO2 nanocatalysts (M =W, Mo, Nb, V, Cr) were synthesized with the size of 12–92 nm by incipient wetness impregnation method to study the effect of different promoters on the catalytic performance in the oxidative coupling of methane. The results at 1 atm, 1048 K, 2500 ml h1 g1, and CH4/O2/N2 = 2/2/1 revealed that C2 selectivity was significantly increased (31.6%) in the order of W> Mo > Nb > Cr > V whereas moderate enhancement (12.6%) was observed in the CH4 conversion in the order of W> Cr > Nb > Mo > V. The results of the characterization techniques (Raman, FT-IR, BET,TGA/DTA and XRD) demonstrated that Mn2O3 and a-cristobalite were the predominant species and active sites in the nanocatalyst surface and Na2MoO4, Na2WO4 and Mn2O3 crystalline phases contributed to achieving high selectivity of C2 products. The redox mechanism involving two metal sites such as Mn3+/2+ and W6+/5+ or Mn3+/2+ and Mo6+/5+ was found to be the most compatible route with the OCM reaction path in which CH4 and O2 adsorption was the controlling step. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.