University of Sistan and Baluchestan is an Iranian public university headquartered in zahedan, Sistan and Baluchestan province, Iran. As the second largest university of Iran, it is the largest university of the province. The university has two campuses located in Iranshahr and Chabahar. Wikipedia.
Shaterian H.R.,University of Sistan and Baluchestan |
Aghakhanizadeh M.,University of Sistan and Baluchestan
Catalysis Science and Technology | Year: 2013
3-Aminopropyltriethoxysilane coated on magnetic Fe3O4 nanoparticles [APTES-MNPs] and 3-aminopropyltriethoxysilane coated on SBA-15 [APTES-(SBA-15)] catalyzed efficiently the one-pot pseudo four-component reaction of salicylaldehydes, malononitrile and secondary amines for preparation of chromeno[2,3-d]pyrimidines under solvent-free conditions at room temperature. The catalysts show environmentally benign character, which can be easily prepared, stored, and recovered without obvious significant loss of activity. This journal is © The Royal Society of Chemistry 2013.
Daya A.A.,University of Sistan and Baluchestan
Arabian Journal of Geosciences | Year: 2015
The aim of current study is to separate geochemical anomalies from background based on stream sediments data by utilizing the concentration–area (C–A) fractal model in Shorabhaji region, northwest of Iran. Stream sediments data were used in this study which was conducted for the primary regional exploration for eight elements (As, Ti, Ag, Cu, Pb, Sn, W, and Au) in Shorabhaji region. Log–log plots for these elements show three populations including low, medium, and high anomaly. Threshold values for the region were computed based on these log–log plots. The thresholds were identified for Ag (1.5 ppm), Ti (1.8 ppm), Ag (1.5 ppm), Cu (1.55 ppm), Pb (1.57 ppm), Sn (1.58 ppm), W (1.78 ppm), and Au (1.25 ppm). Based on the thresholds of the C–A model, the anomaly maps of elements were drawn. There was a good relationship between lithological units and anomalous areas obtained by concentration–area fractal method. © 2014, Saudi Society for Geosciences.
Rahimnia F.,Ferdowsi University of Mashhad |
Hassanzadeh J.F.,University of Sistan and Baluchestan
Information and Management | Year: 2013
By considering the problems that commercial saffron companies have faced in international markets, the aim of this study is to investigate the impact of website content, including informational and design dimensions, on the effectiveness of e-marketing and e-trust as mediator variables. These aspects are examined with reference to sales and marketing division managers in a sample of 100 commercial saffron corporations in the Khorasan province. The findings support the ideas that website content has an effect on e-marketing and e-trust and that e-trust plays a mediating role in the relationship between e-trust and e-marketing effectiveness. © 2013 Elsevier B.V.
Shaterian H.R.,University of Sistan and Baluchestan |
Ranjbar M.,University of Sistan and Baluchestan
Journal of Molecular Liquids | Year: 2011
Brønsted acidic ionic liquid, N-methyl-2-pyrrolidonium hydrogen sulfate, has been used as an efficient and reusable catalyst for the one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles under thermal solvent-free conditions in excellent yields. © 2011 Elsevier B.V. All rights reserved.
Dashtban M.,University of Sistan and Baluchestan |
Tabrizi F.F.,University of Sistan and Baluchestan
Desalination | Year: 2011
A weir-type cascade solar still, integrated with latent heat thermal energy storage system, was designed with the view of enhancing productivity. Use of a heat storage system with 18kg mass (2cm thickness) of paraffin wax beneath the absorber plate keeps the operating temperature of the still high enough to produce distillated water during the lack of sunshine, particularly at night. Also, theoretical models were developed for the still with and without PCM, and the calculated results were compared with the experimental data. In addition, the internal convective heat transfer coefficient calculated from the experimental data of the still without PCM was applied for the calculations since the common relation proposed by Dunkle could not follow the still performance. Moreover, important parameters affecting the performance of the still, such as water level on the absorber plate and distance between water and glass surfaces, were theoretically investigated. The performance of the still with and without PCM was also studied on a typical day in Zahedan, Iran. In this regard, the daily productivity was theoretically found to be 6.7 and 5.1kg/m2day, for the still with and without PCM, respectively. The results showed that the productivity of the still with PCM was theoretically 31% higher than that of without PCM. © 2011 Elsevier B.V.
Ali Akbar D.,University of Sistan and Baluchestan
International Journal of Mining Science and Technology | Year: 2012
This paper is devoted to application of ordinary kriging method in Choghart north anomaly iron ore deposit in Yazd province, Iran. In order to estimate the deposit, 2329 input data gained from 26 boreholes were used. Fe grade was selected as the major regional variable on which the present research has focused. All of the available data were changed to 12.5 m composites so that statistical regularization could be reached. Studies indicated that iron grade input data had single-population characteristics. To carry out ordinary kriging, a spherical model was fitted over empirical variogram. Then the model was verified through cross validation method and proved to be valid with a coherence coefficient of 0.773 between the estimated and real data. Plotting the empirical variogram in different directions showed no geometric anisotropy for the deposit. To estimate the Iron grade, ordinary kriging method was used according to which, all of the exploitable blocks with dimensions 20 m × 20 m × 12.5 m were block estimated within the estimation space. Finally tonnage-grade curve has been drawn and reserve classified into measured, indicated and inferred. © 2012 Published by Elsevier B.V. on behalf of China University of Mining and Technology.
Shabakhty N.,University of Sistan and Baluchestan
Engineering Failure Analysis | Year: 2011
As it is known, fatigue is the process of damage accumulation in material due to the stress fluctuation. The failure occurs when accumulated damage exceed critical level. In practice, uncertainties are incorporated in fatigue estimation especially in the loads and in the capacity of structures. Reasonably these uncertainties can be incorporated within reliability framework or probability context. It is possible to estimate the fatigue reliability based on crack propagation in fracture mechanics and also using reliability context. However the first failure of structural element under fatigue degradation may not lead to the collapse of system, an approach to combine in the system failures is needed.This paper presents a new approach to estimate structural system failure probability of jack-up platforms in combination of fatigue and fracture. The probability of failure for each component is initially estimated using typical fatigue and fracture failure scenario. But for the second element failure in combination of fatigue and fracture, a new approach is presented. This method is based on the Monte Carlo Simulation of crack size in accordance with the crack growth approach in fracture mechanics. Important sequences leading to the structural collapse are identified within the branch and bound technique. Finally the system failure probability through combination of important paths leading to the structural collapse is obtained. Advantage of this method in addition to its simplicity in application is possibility of using the FORM technique to estimate each failure path individually and finally combine them together to determine system reliability. It is shown the system failure under combination of fatigue and fractures has higher probability of occurrence than the purely first or in combination with the second fatigue failures only. © 2010 Elsevier Ltd.
Janfaza M.,University of Sistan and Baluchestan |
Mansouri-Birjandi M.A.,University of Sistan and Baluchestan
Applied Optics | Year: 2013
In this paper, a photonic crystal slab waveguide with wideband slow light, large group index (ng), and very low group velocity dispersion (GVD) has been presented. The structure is designed by shifting the first row of the air holes adjacent to the waveguide center in the longitudinal direction, and optofluidic infiltration in the second row. By applying optimized parameters for the two row of ng(17.5 < ng < 133) with large bandwidth (2 nm < δλ < 23 nm) is obtained. The GVD decreased at the range of 10-22 s2/m. Numerical simulations are performed by the three-dimensional plane-wave expansion method. © 2013 Optical Society of America.
Nehi H.M.,University of Sistan and Baluchestan
International Journal of Fuzzy Systems | Year: 2010
In this paper I will introduce the trapezoidal intuitionistic fuzzy numbers (IF numbers) and will prove some operations for them. Also I am going to propose a new ordering method for IF numbers in which I will consider two characteristic values of membership and non-membership functions for an IF number. These values are defined by the integral of the inverse fuzzy membership and non-membership functions multiplied by the grade with powered parameter.
Daya A.A.,University of Sistan and Baluchestan
Journal of Geochemical Exploration | Year: 2015
Separation of geochemical anomalies from background is a fundamental topic in the field of geochemical exploration. Fractal and multifractal modeling of geochemical data are among these methods and have been used by many geoscientists for more than two decades. In this study, three fractal methods, consisting of concentration-area (C-A), concentration-perimeter (C-P), and number-size (N-S) methods, were applied to identify geochemical anomalies in 317 stream sediment samples from Kamoshgaran region, Kurdestan province, northwest of Iran. Implementation of C-A, C-P, and N-S methods showed that southwestern, eastern, and central parts of Kamoshgaran region were the most important parts and future detailed exploration including lithogeochemical sampling should be focused on these parts. Also, a good relationship was found between alteration units and anomalous areas using fractal methods. Results also demonstrated a strongly positive relationship between As and Au anomalous areas in the region. The resulted thresholds for C-A and C-P methods were slightly different; consequently, the suggested anomalous areas were slightly different. In addition, distinction of the anomalous areas in terms of Au, Cu, and Mo based on N-S method was much better, which could be attributed to the point that there was no data pre-processing and only the raw data were processed for drawing the N-S log-log plot. Maps of the anomalies revealed that As, Cu, and Mo anomalies were simultaneously located in the eastern part of the studied area and corresponded to Au anomalies. From this point of view, it can be said that the studied area could be very important for Au mineralization and its eastern part can be the target of future exploration. © 2014 Elsevier B.V.