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.

Trace Determination of Tamoxifen using Optimized Solvent Bar Microextraction and HPLC-UV

Abstract: Tamoxifen (Soltamox) is an antineoplastic agent and an estrogen receptor antagonist used to treat breast cancer, but have severe side effects such as hot flashes, vaginal discharge, etc. Dose monitoring is a necessity for optimum treatment, to prevent severe adverse effects. In this study, the solvent bar microextraction method (SBME) was used for preconcentration and microextraction coupled with High-performance liquid chromatography-ultraviolet (HPLC-UV) analysis of tamoxifen. The limit of detection and limit of quantification were 13.3 and 40 μgL-1, respectively. The linear range was between 40 and 10000 μgL-1 with a correlation coefficient of 0.999. The enrichment factor was 169 and the relative standard deviation within-day and between-day were 3.6 and 4.0, respectively. The use of sensitive SBME method coupled with HPLC-UV analysis for detection of tamoxifen at trace level proved to be successful, offering a desirable preconcentration factor, and a costeffective and green set-up for determining its rate of elimination from cancer patients and wastewater.

On the Graphs Related to Green Relations of Finite Semigroups

Abstract: In this paper we develop an analog of the notion of the con- jugacy graph of nite groups for the nite semigroups by considering the Green relations of a nite semigroup. More precisely, by dening the new graphs L(S), R(S), H (S), J (S) and D(S) (we name them the Green graphs) related to the Green relations L;R;J;H and D of a nite semigroup S, we rst attempt to prove that the graphs(S) and H (S) have exactly one connected component, and this graphs for reg- ular semigroups are complete. Next, we give a necessary condition for a nite semigroup to be regular. This study shows an intrinsic dier- ence between the conjugacy graphs (of groups) and the Green graphs (of semigroups) as well. Finally, our calculations include two kinds of semi- groups, mostly involving the well known Lucas numbers, and examining the proved assertions.

An empirical study to measure the impact of financial and macro economical figures on capital adequacy

Abstract: Article history: Received August 12, 2012 Accepted 1 October 2012 Available online October 2 2012 Capital adequacy plays an important role for reducing different risk components in banking industry. In this paper, we present an empirical study to measure the impact of financial and macro economical factors on capital adequacy. We gather the necessary information from financial statements and balance sheets of nine Iranian private banks over the period of 20052011. The results of analyzing the data based on the implementation of linear regression technique reveal that there are some meaningful relationship between financial figures, including bank size and profitability, and capital adequacy. However, the survey does not show any relationship between macro economical factors, including growth domestic product and inflations, and capital adequacy. © 2012 Growing Science Ltd. All rights reserved.

Bis(9-amino-acridinium) bis-(pyridine-2,6-dicarboxyl-ato)cuprate(II) trihydrate.

Abstract: The asymmetric unit of the title compound, (C13H11N2)2[Cu(C7H3NO4)2]·3H2O, consists of one [Cu(pydc)2]2− dianion (pydc is pyridine-2,6-dicarboxyl­ate), two 9-amino­acridinum monocations and three uncoordinated water mol­ecules. The CuII atom is coordinated by two pydc dianions acting as tridentate ligands, and forming five-membered chelate rings with copper(II) as the central atom. The CuII atom is surrounded by four O atoms in the equatorial plane and two pyridine N atoms in axial positions, resulting in a distorted octa­hedral coordination geometry. In the crystal, there are two types of O—H⋯O and N—H⋯O hydrogen-bonding synthons linking the anionic and cationic fragments and the water mol­ecules, namely R44(16), and R42(8). There are also weak C—H⋯O hydrogen bonds, π–π stacking inter­actions [the shortest centroid–centroid distance is 3.350 (2) A], and a C—O⋯π inter­action [O⋯centroid distance = 3.564 (2) A], which connect the various components into a three-dimensional network.

Achieving sustainable development goals through the study of urban heat island changes and its effective factors using spatio‐temporal techniques: The case study (Tehran city)

Abstract: The present study is aimed at investigating the spatio-temporal structure of land surface temperature (LST) and its interrelationship with physical and biophysical land surface properties, such as land use, vegetation, the indicators of climate changes and air pollution, and the density of buildings in Tehran city of Iran, using Landsat 5, 7 and 8 thermal bands of satellite images in cold and hot seasons during the 1984–2020 period. The results indicate that the mean LST of Tehran city has gradually increased over time. LST results in a hot season, such as May showed that the changes in 1990 were between 6 and 44°C, in 2000, between 20 and 44°C, in 2013 between 14 and 42°C and in 2020 the changes were between 15 and 51°C. Also, the formation of hot spots in the west and south demonstrated the direct connection pattern of the distribution of space. According to the results, a strong negative LST-NDVI and positive LST-NDBI correlation are observed throughout the period. In addition, as to the other indices, the results indicate a positive correlation among LST, and air pollution indicators (NO2, SO2, CO, CO2, PM2.5, and PM10 ppm), a negative correlation with precipitation and a positive correlation with temperature in climatic indices and negative LST- Humidity, NDWI, and NDMI. These show the regions where water can weaken the UHI effect in the city. LST also has a positive correlation with buildings density and population centers, as well as industries concentrated in the western regions of Tehran that are subjected to rising LST. The mixed urban landscape of the city is closely related to the changes of the LST and the indicators, including NDVI, different land covers, and urban industrial and commercial activities. Finally, the regional vulnerability of Tehran as a metropolis was determined by using geographic information systems and spatio-temporal methods. Based upon the results, the western regions of Tehran had more urban vulnerabilities in terms of thermal phenomena and the northern regions remain with the least vulnerability.