Islamic Azad University North Tehran Branch

About: Islamic Azad University North Tehran Branch is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 868 authors who have published 968 publications receiving 9987 citations.

Effective Factors on the Occurrence of Falling from Height Accidents in Construction Projects by Using DEMATEL Method

Abstract: In construction industries, falling from height recognized is one of the main factors in the occurrence of construction accidents. In this study, 10 construction blocks were selected in Tehran that were under construction. Three groups of organizational, individual and environmental factors and sub-factors were considered as effective factors on the falling from height. Using the experts’ opinion, the main factors were divided into three groups, whereas their sub-factors were divided into 15 cases. Then, DEMATEL method was used to determine the most important factor and it’s sub-factors influencing the occurrence of accidents falling from a height and their relationship. The matrix of the Decision Making Trial and Evaluation (DEMATEL) method shows both the causal relationship between the factors and the effectiveness of their sub-factors variables. The results showed that individual factors were considered as the most important factors and their sub-factors had the most effect on the occurrence of falling from height accidents. It can be said that in determining the relationships of sub-factors, three out of six individual sub-factors including motivation, training hours, and age/experience and two out of five organizational sub-factors including management commitment and safety culture have the most impact on the occurrence of falling from height accidents. Paying attention to safety training and also increasing the motivation of workers can be effective in reducing occupational/psychological stress and accidents of falling from height.

Enhancement of Photocatalytic Efficiency of TiO2 by Supporting on Clinoptilolite in the Decolorization of Azo Dye Direct Yellow 12 Aqueous Solutions

Abstract: Structure and physico-chemical properties of a photocatalyst, especially surface area and absorption ability, were correlated to catalytic activities in photodegradation of dye pollutants in water. In this investigation photocatalytic degradation of azo dye Direct yellow 12 (Chrysophenine G) in water was studied. Titanium(IV) oxide was supported on Clinoptilolite (CP) (Iranian Natural Zeolite) using solid-state dispersion (SSD) method. The results show that the TiO 2 /Clinoptilolite (SSD) is an active photocatalyst. The maximum effect of photo degradation was observed at 10 wt.% TiO 2 , 90 wt.% Clinoptilolite. A first order reaction with k = 0.0108 min -1 was observed. The effects of some parameters such as pH, amount ofphotocatalyst, initial concentration of dye were examined.

Propane-1,3-diaminium pyridine-2,5-di­carboxyl­ate dimethyl sulfoxide mono­solvate

Abstract: In the crystal structure of the title solvated molecular salt, C3H12N22+·C7H3NO42−·C2H6OS, two amine groups of propane-1,3-diamine (pda) are protonated and two carb­oxy­lic acid groups of pyridine-2,5-dicarb­oxy­lic acid (2,5-pydcH2) are deprotonated. The crystal packing features N—H⋯O hydrogen bonds and weak C—H⋯O inter­molecular inter­actions.

Isolation of Two Radiation Resistant and Desiccation Tolerant Bacteria, Modestobacter sp. A2 and Maritalea sp. B9, from Gandom Beryan Hill in the Lut Desert of Iran

Abstract: Although dryland ecosystems are the most abundant terrestrial biomes on the Earth, relatively little is known about their microbial diversity and potential metabolic activities. Therefore, the bacterial diversity of the Lut Desert in Iran has been remained largely obscure. In this study, ionizing radiation resistant bacteria from arid Gandom Beryan region was investigated by a culture-dependent method. After exposing the soil and surface sand samples to different periods of dehydration in a desiccator containing silica gel, two nonendospore- forming bacterial isolates were recovered by plating on R2A and TSA agar media and then subjected to a desiccation and ionizing radiation resistance assay. The isolates A2 and B9 were still recovered after 8 weeks in a desiccator containing silica gel and were moderately resistant to gamma radiation with a D10 value between 2 and 4 kGy. Strains A2 and B9 were affiliated with Modestobacter muralis MDVD1T (99.7% similarity) and Maritalea mobilis E6T (97.3% similarity) respectively, using 16S rRNA gene sequence analysis. This is the first report of radiation resistant bacteria which belongs to the genus Maritalea.

2,6-Diamino-pyridinium bis-(4-hydroxy-pyridine-2,6-dicarboxyl-ato-κO,N,O)chromate(III) dihydrate.

Abstract: The reaction of chromium(III) nitrate hexa­hydrate, pyridine-2,6-diamine and 4-hydroxy­pyridine-2,6-dicarboxylic acid in a 1:2:2 molar ratio in aqueous solution resulted in the formation of the title compound, (C5H8N3)[Cr(C7H3NO5)2]·2H2O or (pydaH)[Cr(hypydc)2]·2H2O (where pyda is pyridine-2,6-diamine and hypydcH2 is 4-hydroxy­pyridine-2,6-dicarboxylic acid). Each CrIII atom is hexa­coordinated by four O and two N atoms from two (hypydc)2− fragments, which act as tridentate ligands, in a distorted octa­hedral geometry. The O—Cr—O—C torsion angles between the two planes of the (hypydc)2− fragments [−99.81 (17) and 97.77 (17)°] indicate that these two units are almost perpendicular to one another. In the crystal structure, extensive O—H⋯O, N—H⋯O and C—H⋯O hydrogen bonds with D⋯A distances ranging from 2.560 (2) to 3.279 (3) A, ion pairing, C—O⋯π [O⋯π = 3.166 (2) A] and π–π stacking inter­actions between (hypydc)2− and (pydaH)+ rings [with a centroid–centroid distance of 3.3353 (14) A] contribute to the formation of a three-dimensional supra­molecular structure.