Maryam Yousefi

Bio: Maryam Yousefi is an academic researcher from Shahid Beheshti University. The author has contributed to research in topics: Essential oil & Lamiaceae. The author has an hindex of 8, co-authored 24 publications receiving 162 citations. Previous affiliations of Maryam Yousefi include Islamic Azad University & Autonomous University of Barcelona.

Convenient Landfill Site Selection by Using Fuzzy Logic and Geographic Information Systems: A Case Study in Bardaskan, East of Iran

Abstract: Results: The results of the current research proposed five locations with the fuzzy membership value of more than 0.9 as the best landfill sites in the study area. The sites were located in the North and North East of Bardaskan city. The study demonstrated that 51.97 % of the study area was not suitable for landfill location whilst only 7.8 % was highly suitable for landfill siting. About 1956.61 hectares of the studied area was suitable for territorial landfill siting. Conclusions: The study results guided the municipality authorities to select the best landfill site among the candidate ones, and due to the broad spectrum of classifications, the output results can enable decision makers to make appropriate decisions to reduce the costs both in economical and bioenvironmental criteria.

Chemical composition and antibacterial activity of the volatile oils from Artemisia turcomanica

Abstract: 0009-3130/10/4605-0819 2010 Springer Science+Business Media, Inc. 1) Department of Chemistry, Faculty of Science, Shahid Beheshti University, GC, Tehran, Iran, fax: 89 21 22431663, e-mail: z_habibi@sbu.ac.ir; 2) Department of Microiology, Faculty of Biological Sciences, Shahid Beheshti University, GC, Tehran, Iran; 3) Department of Chemistry, Scinece & Research Campus, Islamic Azad University, Tehran, Iran. Published in Khimiya Prirodnykh Soedinenii, No. 5, pp. 690–692, September–October, 2010. Original article submitted May 14, 2009. Chemistry of Natural Compounds, Vol. 46, No. 5, 2010

Chemical Composition of Essential Oil of Salvia persepolitana Boiss. and Salvia rhytidea Benth. from Iran

Abstract: The essential oils obtained by hydrodistillation of the aerial parts of Salvia persepolitana Benth, which is endemic to Iran, and Salvia rhytidea Benth were analyzed by GC and GC/MS Manool (373%) was the main component among the twenty-three constituents characterized in the oil of S persepolitana representing 900% of the total components detected The oil of S rhytidea was characterized by higher amounts of terpinolene (270%), sabinene (175%) and limonene (149%) which were among the twenty-two components comprising 983% of the total oil detected

Sustainable landscapes: contradiction, fiction or utopia?

Abstract: As landscapes change continuously in a more or less chaotic way, the concept of sustainable landscapes could be viewed as a utopian goal. New landscapes emerge with changing life-styles. Decision making for landscape planning, conservation and management use the concept of sustainability widely. To make it operational, many new associated and more specific concepts have been proposed such as natural and social capital, conservation economy and quality of life capital. Most of these are inspired by economic thinking and rarely refer directly to the landscape. This article reviews the background and meaning of these concepts and shows that landscape is not seen here as an integrating, holistic concept. As landscape changes, also its meaning and significance changes and consequently its management.

Gate-Variable Optical Transitions in Graphene

Abstract: Two-dimensional graphene monolayers and bilayers exhibit fascinating electrical transport behaviors. Using infrared spectroscopy, we find that they also have strong interband transitions and that their optical transitions can be substantially modified through electrical gating, much like electrical transport in field-effect transistors. This gate dependence of interband transitions adds a valuable dimension for optically probing graphene band structure. For a graphene monolayer, it yields directly the linear band dispersion of Dirac fermions, whereas in a bilayer, it reveals a dominating van Hove singularity arising from interlayer coupling. The strong and layer-dependent optical transitions of graphene and the tunability by simple electrical gating hold promise for new applications in infrared optics and optoelectronics.

Asymmetric catalysis in organic synthesis

Abstract: This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The goal of the project was to prepare new catalyst systems, which would perform chemical reactions in an enantioselective manner so as to produce only one of the possible optical isomers of the product molecule. We have investigated the use of lanthanide metals bearing both diolate and Schiff-base ligands as catalysts for the enantioselective reduction of prochiral ketones to secondary alcohols. The ligands were prepared from cheap, readily available starting materials, and their synthesis was performed in a “modular” manner such that tailoring of specific groups within the ligand could be carried out without repeating the entire synthetic procedure. In addition. Tve have developed a new ligand system for Group IV and lanthanide-based olefin polymerization catalysts. The ligand system is easily prepared from readily available starting materials and offers the opportunity to rapidly prepare a wide range of closely related ligands that differ only in their substitution patterns at an aromatic ring. When attached to a metal center, the ligand system has the potential to carry out polymerization reactions in a stereocontrolled manner. Background and Research Objectives The modern pharmaceuticals and fine chemical industries are heavily reliant upon the ability to produce biologically active organic compounds (antibiotics, flavorings, pesticides, anesthetics, sweeteners etc.) of high optical (enantiomeric) purity. At one time, many drugs were supplied as racemic mixtures (containing equal quantities of both enantiomers) with the assumption that one enantiomer would perform the desired therapeutic function while the other would be harmlessly excreted. However, the catastrophic effects of the drug Thalidomide, sold in the 1960s as a racemic mixture, were traced to the supposedly benign (S)-isomer of the drug and since then the enantiomeric purity of many pharmaceutical products has been controlled by federal regulations. accomplished in one of two ways: (a) preparation of a racemic mixture followed by The preparation of a single enantiomer of a chiral organic molecule can generally be mechanical or chemical separation of the two enantiomers or (b) enantioselective synthesis in which only the target isomer is produced. The majority of pharmaceuticals are currently produced using the first of these methods, with the enantiomers often being separated by *Principal Investigator, email: jwatkin@lanl.gov

Landfill site selection using GIS and AHP: a case study: Behbahan, Iran

Abstract: Finding a suitable site to dispose solid waste is a difficult task for municipality because it is necessary to consider the different factors and criteria in the landfill siting process. In this study, in order to consider all parameters, a combination of Geographic Information System (GIS) and the Analytic Hierarchy Process (AHP) was used for landfill site selection. For the purpose of making decisions in landfill site selection a hierarchy structural was formed and different parameters have been identified, including distance to groundwater, distance to surface water, sensitive ecosystems, land cover, distance to urban and rural areas, land uses, distance to roads, slope, soil type and distance to waste generation places. At first, the rating method was used to evaluate each criterion individually. Then, the relative importance of criteria to each other was determined by an analytic hierarchy process (AHP). Simple Additive Weighting (SAW) method was applied to evaluate the land suitability. The results showed that 38% of the study area have high suitability for land filling. Finally, five sites were a candidate for field investigation with more details.