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Fe/Al-MCM-41: An Efficient and Reusable Catalyst for the Synthesis of Quinoxaline Derivatives
Heravi, Majid. M.,Hosseini, Mariam,Oskooie, Hossein A.,Baghernejad, Bita Korean Chemical Society 2011 대한화학회지 Vol.55 No.2
Fe/Al-MCM-41을 촉매로 사용하여, 1,2-diamines과 1,2-dicarbonyl 화합물을 축합반응을 통하여 quinoxaline 계 화합물을 좋은 수율로 합성하였다. Fe/Al-MCM-41was found to be an effective catalyst for the synthesis of quinoxaline derivatives from the condensation of the 1,2-diamines and 1,2-dicarbonyl compounds in good yields. The catalyst is recyclable and reusable.
Sodium Silicate-catalyzed Multicomponent Synthesis of Pyridine Dicarbonitriles
Heravi, Majid M.,Khorshidi, Maliheh,Beheshtia, Yahia. Sh.,Baghernejad, Bita Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
Pyridine dicarbonitriles have been synthesized good yields via a one-pot multi.component reaction of aldehyde, malononitrile, and thiol in the presence of sodium silicate as a catalyst in ethanol.
Gholamreza Heravi,Nima Gerami Seresht 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
The common approaches for project scheduling in the construction projects mainly focus on the critical activities and their delay risks. In contrast, delay risks of the non-critical activities are commonly ignored. Although, using float time of the non-critical activities give the project managers the flexibility for project execution, improper planning of these activities may turn them into critical activities or even cause delays in projects. In this paper, the delay risk factors of the non-critical activities are identified and a new methodology is proposed for prioritizing the non-critical activities to improve the planning process of the construction projects. Prioritization of the non-critical activities enhances the project manager’s vision toward the risks incorporated with using the float time of each individual activity. Moreover, due to the fact that multiple criteria need to be considered for prioritizing the non-critical activities, an MCDM method is used for this purpose. Finally, an algorithm is developed for application of the proposed methodology in the construction projects. The proposed method is evaluated through a case study and based on the prioritization results a discussion is provided to illustrate the practical application of the method.
Resource-Constrained Time-Cost Tradeoff for Repetitive Construction Projects
Gholamreza Heravi,Saeed Moridi 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8
The time-cost tradeoff problem is to find optimal combinations of construction options with the objective of minimizing project time and cost. In order to search for such a set of optimal solutions, the total time and cost of projects needs to be calculated properly. In repetitive construction projects (RCPs), due to division of work into several units and involvement of many resources for activities completion, scheduling is unique and more complicated. Scheduling method in this paper besides addressing common constraints such as precedence relationships, required lead time and lag distance between activities, enables project managers to consider all resources and their shortages in scheduling. To raise the practicality of model, in addition to direct and indirect costs, resource idle cost is considered as a cost element in estimating total cost of project. The time variant multi-objective particle swarm optimization is applied to find non-dominated solutions on the basis of minimizing time and cost of project. An application example is presented at the end to illustrate the performance of the model. This research presents a resource-constrained time-cost tradeoff model to find the optimal set of crew combinations for project activities in RCPs, considering time and cost simultaneously.
Sodium Silicate-catalyzed Multicomponent Synthesis of Pyridine Dicarbonitriles
Majid M. Heravi,Maliheh Khorshidi,Sh. Beheshtia,Bita Baghernejad 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
Pyridine dicarbonitriles have been synthesized good yields via a one-pot multi–component reaction of aldehyde,malononitrile, and thiol in the presence of sodium silicate as a catalyst in ethanol.
Moussavi, A. Heravi,Ahouei, M.,Nassiry, M.R.,Javadmanesh, A. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.5
The objective of this study was to evaluate the association of genetic differences in the bovine leptin gene and milk yield, reproduction, body condition score (BCS), and plasma glucose level in Iranian Holstein cows. In total, two hundred and thirty eight cows were used and genotyped for a restricted fragment length polymorphism at the leptin gene locus. Two genotypes, AA and AB, have been distinguished which have the frequencies of 0.89 and 0.11, respectively. The genotypes were distributed according to the Hardy - Weinberg equilibrium ($x^2$ = 0.733). During the first 12 wk of lactation, milk yield and composition, live weight, BCS and plasma glucose were measured in 50 cows. Data were analyzed based on a repeated measures ANOVA. During this period, milk yield and composition, live weight, BCS and plasma glucose level were similar among the genotypes. The first cumulative 60-d milk yield, 305-d milk yield, days to first breeding, days open and days from first breeding to conception using previous lactation records were also analyzed using Standard Least Square within mixed models. Fixed effects were year, season, parity and age at calving, and sire. For the reproductive traits the cumulative first 60-d milk yield was also added to the model. Animal was fitted as a random effect. A significant association was detected between the RFLP-AB genotype and 305-d milk yield (p<0.05). The first 60-d cumulative milk yield was similar for the two genotypes (p = 0.21) and tended to be higher in the heterozygous cows. The heterozygous genotypes at the above mentioned locus had a trend to better reproductive performance than the homozygous. The results demonstrate that the RFLP B-allele can yield a higher 305-d milk production with a trend to better reproductive performance.
Reza Entezari Heravi,Farzin Hadizadeh,Mojtaba Sankian,Jalil Tavakol Afshari,Javad Behravan 한국유전학회 2012 Genes & Genomics Vol.34 No.2
Cyclooxygenase-2 (COX-2) inhibitors including celecoxib inhibit cell growth and induce apoptosis in cancer cells. In this study, the relation of Bax (an apoptosis promoter) to Bcl-2(an apoptosis inhibitor) ratio with the apoptosis co-ordination enzyme, caspase-3 was investigated in correlation with the treatment of 4,5-bisaryl imidazolyl imidazoles as novel selective COX-2 inhibitors in Caco-2 colorectal cancer cells . Recently, the organic reactions under microwave irradiation attracted attention of scientists due to their high reaction rate,mild reaction conditions and the formation of clean products. Therefore, a microwave-assisted method was used to synthesize our compounds. The effects of these COX-2 inhibitors on the proliferation of Caco-2 cells were evaluated by MTT assay. cDNA microarray and clustering analysis were used to evaluate effects of our synthetic compounds on gene expression pattern of 112 genes involved in apoptosis pathways. Bax, Bcl-2 and caspase-3 mRNA expression and their relationship were analyzed by quantitative real-time PCR. Results indicated that proliferation of Caco-2 cells after treatment with 4,5-bisaryl imidazolyl imidazoles on Caco-2 cells were time and dose dependent. We conclude that increase in Bax/Bcl-2ratio leads to an up-regulation in caspase-3 mRNA expression.
Mohammad Ehsan Momeni Heravi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
In this paper, silver nanoparticles (Ag-NPs) colloidal suspensions with different particle sizes of 5 to 40 nm wereprepared. Dynamic light scattering (DLS) technique showed that the average hydrodynamic diameters of Ag-NPs were muchlarger than the particle diameters obtained using transmission electron microscopy and UV-Vis spectroscopy. The as-preparedAg-NPs with different average hydrodynamic diameters were incorporated in cotton fabrics by the pad-dry-cure method. Thesilver content before and after washing cycles were determined by inductively coupled plasma spectrometry (ICP). Theantibacterial properties of the fabrics after 0, 5 and 10 laundering cycles against both the Gram-negative bacterium ofEscherichia coli (E. coli) and the Gram-positive bacterium of Staphylococcus aureus (S. aureus) were examined and a clearvolcano trend was observed between the bacterial reduction rate (BR) and the hydrodynamic diameter of Ag-NPs loaded onthe fibers. The cotton fabric treated by the Ag-NPs with the hydrodynamic diameter of 52 nm, exhibited the highestantibacterial activity (about 98 %) after 10 laundering cycles, while the other samples on either side of the volcano were lessactive. The cytotoxicity of the cotton fabrics treated with Ag-NPs was assayed on mouse embryonic fibroblast cells andevaluated by an MTT assay. The results showed that Ag-NPs were not toxic. Field emission scanning electron microscopy(FESEM) obtained from the cotton fabric before and after washing cycles demonstrated that the Ag-NPs had tight bonds withthe surface of cotton fabric.