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.

Establishing an information network among Islamic Sciences Centers in Iran: a feasibility study

Abstract: Purpose – This study aims to evaluates the existing and potential facilities in Iranian Islamic Sciences Centers (ISCs), including information resources, budget, human resources and facilities. It identifies the views of Center managers in order to find grounds for cooperation and collaboration and to develop communication and information exchanges between the Centers.Design/methodology/approach – The population of this research includes all 123 ISCs in Iran. Questionnaires were distributed in a three‐month interval (August to October, 2008). The data were analyzed using SPSS software (Version 16).Findings – The findings show that ISCs support the establishment of a network and would join it; however, lack of professionals in the informatics and network development, lack of in‐service training facilities, lack of financial and facilities, lack of access to the resources of other centers and the absence of fast exchange of information are among the problems that need much attention.Practical implications –...

The Evaluation of Sea Surface Topography Models based on the Combination of the Satellite altimetry and the Global Geoid Models in the Persian Gulf

Abstract: One of the difficulties in using absolute altitudes is the separation between the mean open sea level and geoid. Theoretically, geoid is the base level in absolute altitudes, but practically, the mean open sea level is used as a base level for absolute altitudes. The difference between these two levels is called as the sea surface topography. In this research, it is dealt the mean sea level modeling by using the observations of three altimeter satellites (i.e. Topex/Poseidon, Jason-1 and GFO) in Persian Gulf and then it is dealt with the evaluation of existing models of the sea surface topography based on the altimeter satellites data and the global geopotential geoid models (i.e. European Improved Gravity model of the Earth by New techniques, Gravity field and steady-state Ocean Circulation Explorer, Earth Gravitational Model 2008. The results of this research indicate that the sea surface topographical model resulting from the EIGEN06C geoid is the most precise model with changes range between -2.482 m and -1.511 m and mean -0.23 m.

An investigation on the effect of the corporation governance structure and free cash flow on over- investment

Abstract: Article history: Received July 28, 2013 Received in revised format 20 November 2013 Accepted 8 January 2014 Available online January 9 2014 This study examines the impact of corporate governance structure and free cash flow on overinvestment on 121 firms listed in Tehran Stock Exchange over the period 2008-2011. To measure over-investment, free cash flow and corporate governance variables based on available information reported on financial statements are gathered and using cross section regression method, different hypotheses of the survey are examined. The results indicate that among corporate governance mechanisms investigated in survey, there is a significant relationship between percentage of non-executive directors and ownership concentration with overinvestment. However, there was no meaningful relationship among controlling shareholders and duality with over-investment. Furthermore, a significant relationship between free cash flow and over-investment has been found.

Hazard zoning around electric substations of petrochemical industries by stimulation of extremely low-frequency magnetic fields

Abstract: Electromagnetic fields in recent years have been discussed as one of the occupational hazards at workplaces. Hence, control and assessment of these physical factors is very important to protect and promote the health of employees. The present study was conducted to determine hazard zones based on assessment of extremely low-frequency magnetic fields at electric substations of a petrochemical complex in southern Iran, using the single-axis HI-3604 device. In measurement of electromagnetic fields by the single-axis HI-3604 device, the sensor screen should be oriented in a way to be perpendicular to the field lines. Therefore, in places where power lines are located in different directions, it is required to keep the device towards three axes of x, y, and z. For further precision, the measurements should be repeated along each of the three axes. In this research, magnetic field was measured, for the first time, in three axes of x, y, and z whose resultant value was considered as the value of magnetic field. Measurements were done based on IEEE std 644-1994. Further, the spatial changes of the magnetic field surrounding electric substations were stimulated using MATLAB software. The obtained results indicated that the maximum magnetic flux density was 49.90 μT recorded from boiler substation, while the minimum magnetic flux density of 0.02 μT was measured at the control room of the complex. As the stimulation results suggest, the spaces around incoming panels, transformers, and cables were recognized as hazardous zones of indoor electric substations. Considering the health effects of chronic exposure to magnetic fields, it would be possible to minimize exposure to these contaminants at workplaces by identification of risky zones and observation of protective considerations.

(2,9-Dimethyl-1,10-phenanthroline)(4-hydroxy­pyridine-2,6-dicarboxyl­ato)copper(II) trihydrate

Abstract: In the title complex, [Cu(C7H3NO5)(C14H12N2)]·3H2O, there are two independent neutral mol­ecules of the Cu complex along with six mol­ecules of water of hydration in the asymmetric unit. The CuII atoms in each complex adopt a distorted square-pyramidal coordination geometry being penta­coordinated by one N and two O atoms of 4-hydroxy­pyridine-2,6-dicarboxyl­ate anions and two N atoms of 2,9-dimethyl-1,10-phenanthroline (dmp) molecules. In the crystal structure, there are O—H⋯O and C—H⋯O hydrogen bonds and five π–π stacking inter­actions with centroid–centroid distances in the range 3.620 (1)–3.712 (1) A. In addition, a C—H⋯π inter­action between a heterocyclic ring of dmp is observed to reinforce the crystal cohesion.