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Showing 5 results for Motazedian


Volume 3, Issue 2 (6-2014)
Abstract

Essential oils are volatile mixtures of hydrocarbons with diverse functional groups. In the current study the effect of essential oils from five medicinal plants including Zataria multiflora and Nepeta cataria (Lamiaceae), Tagetes minuta and Artemisia sieberi (Asteraceae), and Trachyspermum ammi (Apiaceae) were analyzed using GC-mass spectrometry. The toxicity of these plant essential oils against the adult stage of the cabbage aphid, Brevicoryne brassicae L. (Hemiptera: Aphididae) was studied using a fumigant assay.GC/Mass analysis revealed that the main essential oils varied between species. The most abundant components in N. cataria, Z. multiflora, T. ammi, T. minuta and A. sieberi were 4a-α, 7-β, 7a-α-nepetalactone (76.8%), carvacrol (62.1%), γ-terpinene (27.1%), limonene (13.0%) and artemisia ketone (48.0%) respectively. The fumigant assays showed that all of these essential oils were toxic to B.brassicae in a dose-dependent manner. The essential oils of N. cataria at 126, 63, 31, 16, 8, and 3 μl L-1 air caused 94, 76, 52, 46, 36, and 24% mortality within 24 hours, respectively. The same trend was seen when essential oils of the other plants were tested against B. brassicae. These plant essential oils have great potential to be used in integrated pest management especially in greenhouses or other closed systems.

Volume 4, Issue 1 (Spring 2020)
Abstract

Abstract
Research subject: Nanocomposites are a new class of materials that have at least one of their major constituents, at least in one dimension, in the range of one to one hundred nanometers. Typically, nanocomposites have different and superior properties in terms of mechanical and physical properties than conventional composites.
Research approach: In this study, polyvinyl acetate was prepared by emulsion polymerization for polymer matrix. Then the diamond nanoparticles were modified with silane agent. Finally, polyvinyl acetate / diamond nanocomposite was prepared and analyzed with 0.5, 1, 1.5 and 2 wt% of modified diamond nanoparticles. To determine the properties and structure of the nanocomposite, FTIR, TGA, RMS, FESEM, oxygen permeation analysis was used in the films produced and contact angle measurements.
Main results: FTIR Analysis revealed that the modification of the diamond nanoparticles with the silane agent was well performed. FESEM images show that homogeneous nanocomposites were created. Oxygen permeability in polyvinyl acetate / diamond nanocomposite film decreases with increasing percentage of modified nanoparticles in nanocomposite. This is a valuable property if this nanocomposite is used as a fruit preservative coating. Contact angle measurement of polyvinyl acetate / diamond nanocomposite showed that by increasing the amount of modified diamond nanoparticles from 0.5 to 2 wt %, the hydrophobicity of nanocomposite film increased. Therefore, by increasing the specific amount of nanoparticles to the polymer matrix, the polymer properties such as heat resistance and tensile strength are increased which increases the efficiency of the polymer.



Volume 7, Issue 3 (Summer 2019)
Abstract

Aims: 2005 DashteBarm forests of Fars province image is used to investigate and evaluate the capability of Quickbird satellite imagery to differentiate tree canopies regions from no-tree areas.
Materials and Methods First, the validity geometric correction of satellite image was assured. By systematic random sampling, 79 square footages of (20*20) in ARCGIS 9.3 software was designed and on the footages’ places of the combined image from Quickbird panchromatic band and multispectral band, the samples of no tree canopies and tree canopies areas was obtained. Then, 20% of the footages were considered as test samples and the rest was studied as training samples. In the next step, processes on a multivariate image were performed by ENVI 4.3 software and some indexes such as NDVI, GNDVI, RVI Partial Component Analysis (PCA) were created and integrated and were combined. Then, two classifications on the original image and processed bands with two methods of maximum likelihood and Support Vector Machine (SVM) were categorized, in which the images were classified into two classes of trees and non-trees.
Findings: Evaluation of the classified images using the test samples showed that the accuracy and Kappa coefficient in the classified images of the original bands were 94.478% and 0.789 for the maximum likelihood method and 94.848% and 0.877 for the support vector machine, respectively. Also, the results of the processed band's classifications by maximum likelihood and support vector machine methods showed that these images have 94.274 and 94.683% accuracy and Kappa coefficient of 0.875 and 0.882, respectively.
Conclusion: The results of this study show that the Quickbird satellite image is suitable for separating tree canopies and no tree canopies areas in Zagros forests and similar areas.
 


Volume 14, Issue 1 (Spring 2024)
Abstract

Aims: The industrial architecture heritage of Iran is exposed to natural deterioration or human destruction. In protecting the industrial architecture heritage, mostly physical aspects that have a tangible perception are often analyzed. While, other influential aspects with a non-physical nature are effective in the protection process. The present study is aimed to investigate the intangible aspects of industrial architecture heritage as a neglected values and variables in the conservation process by focusing on Tehran’s Silo.

Methods: This paper is a historical-adaptive research and has a qualitative nature. First among the typologies of heritage values, Pereira Roders’ typology is proposed using the logical reasoning technique; Then by re-reading the historical documents of Tehran’s Silo, the values of this kind of heritage are analyzed and after matching with the selected typology components, they are interpreted and analyzed.    
Findings: Knowledge in the field of industrial architecture heritage values plays a fundamental role in emphasizing on the approach of protecting the base value. The achievement of research is to explain and categorize the values of Tehran’s Silo based on Roders’ typology in eight primary values social, economic, political, historic, aesthetical, scientific, age, and ecological and thirty secondary values.

Conclusion: The results of the research indicate that a major part of the industrial architecture heritage values has intangible aspects. The exact analysis of the aspects of the industrial architecture heritage values, makes it possible to evaluate and prioritize the values of this heritage and take informed decisions about selecting the optimal type of conservation.
 

Volume 14, Issue 2 (3-2012)
Abstract

Two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae), is one of the most injurious pests of fruits, vegetables and ornamental plants worldwide, both outdoor and indoors. Currently the main method of control of this pest is through application of pesticides which is mostly accompanied by the resistance of the pest against pesticide(s). The resurgence of resistant mite populations brings about further contamination of foodstuff and environment. Essential oils obtained from the aerial parts of plants may have the potential to be an alternative to synthetic pesticides, since they have been demonstrated to posses a wide range of bioactivities against insects and mites. So, the aim of the current study was to investigate the effect of essential oils extracted from three different medicinal plants namely: Mentha longifolia, Salvia officialis (both Lamiaceae) and Myrtus communis (Myrtaceae) against T. urticae. The LC50 values of essential oils of M. longifolia, M. communis, and S. officialis against T. urticae were 20.08, 53.22, 60.93 µl L-1 air, respectively. This shows that M. longifolia possesses the highest lethal activity whereas S. officialis the lowest. Also, essential oils of M. longifolia, M. communis, and S. officialis were demonstrated to possess repellency effect with ED50s of 147.47, 138.80 and 164.41, µl L-1 air, respectively. These data suggest that essential oils of all the three plants have the potential to be employed in the pest management programs designed for a control of T. urticae under greenhouse conditions.

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