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Search Results: 1 - 10 of 187 matches for " Saman Damavandi "
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Immobilized Ionic Liquid-Catalyzed Synthesis of Pyrano[3,2-b]indole Derivatives
Saman Damavandi
Journal of Chemistry , 2012, DOI: 10.1155/2012/841632
Abstract: An ionic liquid-catalyzed synthesis of 2-amino-4,5-dihydro-4-arylpyrano[3,2-b]indole-3-carbonitrile derivatives through a novel three-component condensation of 3-hydroxyindole, aromatic aldehydes and malononitrile in the presence of silica supported ionic liquid of [pmim]HSO4SiO2 (silica supported 1-methyl-3-(triethoxysilylpropyl)imidazolium hydrogensulfate) as an efficient catalyst is described.
One-pot multicomponent route to propargylamines using ferric hydrogensulfate
Hossein Eshghi,Gholam Hossein Zohuri,Saman Damavandi
European Journal of Chemistry , 2011, DOI: 10.5155/eurjchem.2.1.100-103.175
Abstract: The one-pot three-component coupling reaction of phenylacetylene, aldehyde and amine derivatives in the presence of ferric hydrogensulfate, [(Fe(HSO4)3], as an efficient heterogeneous catalyst is reported. The catalyst displayed high activity and afforded the corresponding propargylamines in good to excellent yields. This method provides the wide range of substrate applicability. Heterogeneous nature of the catalyst made it reusable for further chemical reactions.
Gamma-ray compton spectrum analysis to enhance medical imaging using wavelet transformation  [PDF]
Ali Pazirandeh, Saman Ebrahimi
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.311123
Abstract: Cs-137 radioactive source with 661.7 keV gamma- ray energy and Am-241 with 59.5 keV gamma-ray energy were used to study the body structure of materials by examining transmitted gamma-ray spectrum using a scintillation detector, NaI(Tl). Due to specific characteristic properties of the medium, the passing Compton broad scattering spectrum contains valuable information. It is possible to mark and to specify the Compton spectrum caused by atomic specifications of Al, Cu, bone, muscle, and lipid as interactive materials. Wavelet transforms and other multi-scale analysis functions have been used for compact signal and image representations in de-noising, compression and feature detection processing problems for about twenty years. Comparing the transmitted spectra through muscle, bone and a tumor-like (fat) and analyzing each spectrum by wavelet analysis, the differences of the medium were shown. This study is devoted to use of wavelet transform for feature extraction associated with gamma spectrum, which corresponds to image pixel, and their classification in comparison with the Haar and Rbio3.1 transforms.
The Effect of Clay Content and Land Use on Dispersion Ratio at Different Locations in Sulaimani Governorate—Kurdistan Region—Iraq  [PDF]
Saman M. K. Rasheed
Open Journal of Soil Science (OJSS) , 2016, DOI: 10.4236/ojss.2016.61001
Abstract: Land use changes from natural ecosystems into managed ecosystems resulted in negative impact on soil structure and quality. The purpose of this study was to determine the influences of different land-use types on physical and chemical properties of soils in Sulaimani governorate. Land use systems including natural forest, pastureland and agriculture were identified. Ten of soil samples were collected from the 0 - 30 cm depth, and some soil physical and chemical properties of soil were determined. The land use alters from forest to agriculture resulting in significant decrease in organic matter, calcium carbonate and soil surface area and with this change, dispersion ratio affected on the physical property. The value of DR was highest in the Zrguezi Gawra cultivated with Cucumber and the lowest value in Dukan is 13%, and correlation coefficient between dispersion DR with sand, silt and bulk density is positive, value is (0.4979, 0.0126 and 0.7536) respectively, and with clay and specific surface area (SSA) the correlation coefficient value is (-0.7281 and -0.4466).
Application of Artificial Neural Networks in Order to Predict Mahabad River Discharge  [PDF]
Saman Mohammadi, Maaroof Siosemarde
Open Journal of Ecology (OJE) , 2016, DOI: 10.4236/oje.2016.67040
Abstract: Estimating of river discharge is one of the more important parameters in the water resources management. In recent years, due to increasing population, increased water consumption in industrial, agricultural and health sections, thus water shortge becomes a global problem. Accurate estimation of the river discharge is one of the most important parameters in surface water resources management, especially in order to determine appropriate values in flood, drought, drinking, agricultural and industral topics. The case study in this research is Mahabad River that is located in west Azarbaijan province in west north of Iran. In this study, we used 70%, 15% and 15% data in order to train, validate and test, respectively. In this study, data of Kawtar and Baitas stations were used in order to determine Mahabad River discharge. In each ststion, several different networks were prepared using NeuroSolutions V.6.0 software. The neural models included Multilayer Perceptron (MLP), Generalized Feed Forward, Jordan/Elman, Radial Basis Functions (RBF) and Principle Component Analysis (PCA), and different transfer functions included Tanh, Sigmoid, Linear Tanh, Linear Sigmoid and the number of hidden layers of.The different number of nodesin layers with different learning algorithms (Momentum, Levenberg Marquardt, Quickprop, DeltaBarDelta, Conjugate Gradient) and different networks were compared. The results showed the artificial neural networks. They predicted the river discharge with 10.67 and 0.94 (m3/s)2 and the high value of correlation coefficient with 0.88 and 0.75 for Kawtar and Baitas stations respectivly.
The Importance of Gender as a Moderator for the Relationship between Emotional Intelligence and Mental Health of Adolescents
Jafar Shabani,Alireza Jilardi Damavandi
Asian Social Science , 2011, DOI: 10.5539/ass.v7n9p142
Abstract: This research examined whether Emotional Intelligence (EI) could be considered as a predictor for mental health. It also aimed to explore the moderating effect of Gender on the relationship between EI and mental health among high school students. The participants in the study included 10th, 11th, and 12th grade students from 8 public high schools in Gorgan City, north of Iran. They were 247 high school students, specifically comprised 124 boys and 123 girls, age ranged between 14 to 17 years old. The research design was an ex post facto and tested for alternative hypotheses. Two valid and reliable instruments were used to assess EI and mental health. Data analysis included frequencies, percentages, mean scores, simple regressions and moderated regressions. The result demonstrated that mental health could be influenced by EI. In addition, gender was a significant moderator for the relationship between EI and mental health.
Towards the Contribution of NEMDBs in Global Genetic Heterogeneity
Saman Majeed
International Journal of Emerging Sciences , 2011,
Abstract: Research into disease genetics has advanced many folds after the completion of Human Genome Project. Disease Genetics is a complex research area involving core databases, locus-specific databases, and National Ethnic/population Mutation Databases (NEMDBs). Recent progress in disease genetics has emphasized the need of population specific mutation repositories. This has given way to the development of NEMDBs worldwide. To emphasize its importance, a timely overview is presented highlighting the need for a Genetic Disease Database for Pakistan, stressing its over-riding importance and discussing the seriously lacking progress made so far in its accomplishment. Data management has been the greatest problem with the outburst of genetic data being generated in the subcontinent. Many factors contribute to this slow progress. The primary cause is limited funding. It is arguably the most fundamental problem for this kind of research to take place along with the intrinsic research bias towards acquiring new data rather than managing the old data. Valuable discoveries that deal with the genetic basis of disease are therefore being wasted, and this can only be remedied by creating a National Mutation Database specific to Pakistani population. Advancement in scale and sophistication has resulted in vast amount of data being generated. Therefore, there should be possibility to correlate all of this information to ascertain a detailed understanding of how genetic differences influence human health.
Hydraulic Jumps on Adverse Slope in Two Cases of Rough and Smooth Bed
Saman Nikmehr
Research Journal of Applied Sciences, Engineering and Technology , 2010,
Abstract: One of the most frequently encountered cases of rapid varied flow is the hydraulic jump. It occurswhen a supercritical flow has to change into subcritical flow. Nowadays jump study upon sloping beds,especially adverse slopes, is important because of the length of jump and the energy loss. In this research jumpstudy has been done upon four adverse slopes -0.00125, -0.0025, -0.00375 and -0.005 in two cases of roughand smooth bed. The results showed that the Sequent depth ratio and the length of jump upon smooth bed hasbeen more than rough bed for the same slopes and Froude numbers. Also comparison with percentage of theenergy loss, more energy loss has occurred upon rough bed than smooth bed.
The Comparative Study of Reactive Tact and Prevention of the Goods Smuggling in Iran and America's Laws
Saman Saeedi
International Journal of Nations Research , 2018, DOI: -
Abstract: The topic of the present study is "The comparative study of reactive tact and prevention of the goods smuggling in the Islamic Republic of Iran and the United States of America's Laws ". The reason behind that is upon facing a problem we need to come up with a solution to get out of the situation. Moreover, getting out of the situation is not enough, but the solution must cover the future. Therefore, scientific solutions must be made with the precise plan to be productive. The solutions based on studying and researches are not the ways to deal with any offense. Instead of punishing a criminal, we must seek the cause of the crime. Why does this person commit a crime and in what situation has he committed the crime? What has been the context of this crime? In the present study, the factors affecting smuggling of goods and the ways of fighting them as well as the criminal policy with decriminalization of the crime will be studied and then we will continue to follow the usual procedure for the goods smuggling case in government agencies
Percolation on Hypergraphs with Four-Edges
Ojan Khatib Damavandi,Robert M. Ziff
Physics , 2015, DOI: 10.1088/1751-8113/48/40/405004
Abstract: We study percolation on self-dual hypergraphs that contain hyperedges with four bounding vertices, or "four-edges", using three different generators, each containing bonds or sites with three distinct probabilities $p$, $r$, and $t$ connecting the four vertices. We find explicit values of these probabilities that satisfy the self-duality conditions discussed by Bollob\'as and Riordan. This demonstrates that explicit solutions of the self-duality conditions can be found using generators containing bonds and sites with independent probabilities. These solutions also provide new examples of lattices where exact percolation critical points are known. One of the generators exhibits three distinct criticality solutions ($p$, $r$, $t$). We carry out Monte-Carlo simulations of two of the generators on two different hypergraphs to confirm the critical values. For the case of the hypergraph and uniform generator studied by Wierman et al., we also determine the threshold $p = 0.441374\pm 0.000001$, which falls within the tight bounds that they derived. Furthermore, we consider a generator in which all or none of the vertices can connect, and find a soluble inhomogeneous percolation system that interpolates between site percolation on the union-jack lattice and bond percolation on the square lattice.
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