University of Sistan and Baluchestan

www.usb.ac.ir
Zahedan, Iran

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.

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Rasouli S.,University of Sistan and Baluchestan
Applied Physics A: Materials Science and Processing | Year: 2017

Nano- and micro-self-biased sensors employed environmental harvested energy, which are provided by different methods, such as piezoelectric. Piezoelectric materials are capable of producing electrical energy from environmental mechanical force. In this paper, a radial layer of well-arrayed hexagonal zinc oxide nanowires is grown on carbon fiber substrate using a two-step Chemical deposition method of metal salt growth. The resulted morphology is examined using Field Emission Scanning Electron Microscopy (FESEM) micrographs and X-ray Diffraction (XRD) pattern which indicates the quality and the crystallization order of the samples. In addition, composition of the material is studied using a Fourier Transform Infrared (FTIR) spectroscopy method. The results show that zinc oxide nanowires are well managed in vertical direction on the cylindrical carbon fibers. The hexagonal nanowires are grown with a length from 206 to 286 nm (Nanometer) and the diameter from 75 to 103 nm. The results of FTIR spectroscopy and XRD also illustrate the wurtzite structure of zinc oxide. The synthesized nanowires are then applied in a flexible capacitive piezoelectric nanogenerator consisting of a thin Ag layer as the upper contact and a carbon substrate as the back contact which are separated by a PMMA dielectric film. The output current and voltage are measured by applying a random pulse mechanical force on the upper contact. A maximum voltage and current of 14 mV (millivolt) and 20 nA (nanoampere) are generated at the output of nanogenerator, respectively. © 2017, Springer-Verlag Berlin Heidelberg.


Ashhadi M.,University of Sistan and Baluchestan
Superlattices and Microstructures | Year: 2017

The electron transport properties of an armchair γ-graphyne (γ-yne) nanoribbon and γ-BN graphyne (γ-BN-yne) nanoribbon embedded between two armchair γ-yne nanoribbons are systematically investigated by a tight-binding (TB) model. The parameters of tight biding hopping and on-site energies are obtained by comparing the tight binding band structure of γ-yne and γ-BN-yne monolayers with the first-principles calculations. We numerically compute the electronic transport properties in terms of transmission and current-voltage characteristic. It is shown that by increasing the length of γ-BN-yne nanoribbon transmission through the system decreases. © 2017 Elsevier Ltd.


Shabani H.,University of Sistan and Baluchestan
International Journal of Modern Physics D | Year: 2017

In this paper, we investigate cosmological consequences as well as statefinder diagnosis of a scenario for recently reported accelerated expansion of the universe in the framework of (Formula presented.) gravity theories. In these models, (Formula presented.) and (Formula presented.) denote the Ricci curvature scalar and the trace of the energy–momentum tensor (EMT), respectively. Our scenario assumes that the generalized Chaplygin gas (GCG) along with the baryonic matter are responsible for this observed phenomenon. We consider three classes of Chaplygin gas models which include three different forms of (Formula presented.) function; those models which employ the standard CG (SCG), models which use GCG in the high pressure regimes and finally, the third case is devoted to investigating high density regimes in the presence of GCG. We also test these models using recent Hubble parameter as well as type Ia supernova data. Finally, we compare the predicted present values of the statefinder parameters by these models to the astronomical data. © 2017 World Scientific Publishing Company


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.


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.


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.


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.


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.

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