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Mohammad Bany Salman,Minkyu Park,Mosab Jaser Banisalman 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.12
In this study, we employed molecular dynamics simulations to explore the influence of strain on primary defect formationand interstitial dislocation loop (IDL) development in pure tantalum (Ta) and Ta-20 W alloy systems under collision cascadeevents. The investigation considered primary knock-on atom (PKA) energies ranging from 5 to 30 keV at 30 K andsubjected volumetric structures to six distinct strain values, encompassing both compressive and tensile strains. Our resultsrevealed that the number of surviving Frenkel pairs (FPs) and self-interstitial atom (SIA) clusters increased with tensilestrain and decreased with compressive strain, with the Ta-20 W alloy exhibiting the lowest observed numbers compared topure Ta. Notably, SIA clusters in pure Ta were approximately double those in alloyed structures for clusters containing twoto four atoms. We also observed that pure Ta systems displayed larger and longer IDL segments than alloyed Ta systems,which featured smaller and shorter IDLs. The applied strain was found to lower the barrier for IDL formation, potentiallyleading to material degradation. In conclusion, this study highlights the importance of considering the effects of strainand alloying in radiation-damaged environments, particularly in low-temperature, high-radiation-energy environments.
GIS-based sinkhole susceptibility mapping using the best worst method
Mohammad Maleki,Mohammad Salman,Saeideh Sahebi Vayghan,Szilard Szabo 대한공간정보학회 2023 Spatial Information Research Vol.31 No.5
Sinkholes are among karst forms and their formation is continuous and their identification is essential in several fields of life, such as water resources management, environmental hazards management, and tourism. This study aimed to identify the sinkholes and the sinkhole susceptibility in the Bistoon-Parav karst region, Iran. Ten sinkhole causative factors, precipitation, temperature, evaporation, lithology, soil type, slope, latitude, fault, stream and vegetation were involved in the sinkhole susceptibility model applying the best worst method, and we also determined the importance of the factors. The final sinkhole susceptibility map was produced by the weighted summing up the factors based on the variable importance. Lithology was the most important factor with 31.52% in the formation of sinkholes. The validation step was executed with a sinkhole database based on visual interpretation of high-resolution imagery. Finally, the receiver operating characteristic (ROC), completeness, correctness and quality index were applied to validate the performance of the sinkhole susceptibility map model. According to the validation parameters, the value of the ROC, completeness, correctness and quality was 81.90%, 100%, 59.41% and 59.41%, respectively. Thus, it can be said that the produced model shows acceptable performances for sinkhole susceptibility mapping. Also, this model showed that almost 7.4% of the region has the potential to become a sinkhole in the future.
Mohammad Amin Esmaeilbeig,Salman Movahedirad 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4
Molecular dynamic simulation was used to calculate the self-diffusion coefficients of ions in aqueous KCl solution. The simulations were performed for enough time (12 ns) in the form of all-atom to determine the accurate values of the self-diffusion coefficients. The values of the self-diffusion coefficients were calculated by Einstein equation. Two different force fields of Dang and Deublein were employed in the simulations, and we found that at low ion concentration (equal or less than 3mol/(kg of H2O)), the Dang force field is more accurate for prediction of the selfdiffusion coefficient of K+ ions and Deublein force field is more accurate for Cl− ions. An Arrhenius type equation was used to model the temperature dependence of the self-diffusion coefficients and the diffusion activation energies at different ion concentrations were reported.
Synthesis and Characterization of Chemiluminescent Conducting Polyluminol via Biocatalysis
Mohammad Reza Nabid,Soheil Salman Taheri,Roya Sedghi,Seyed Jamal Tabatabaei Rezaei 한국고분자학회 2011 Macromolecular Research Vol.19 No.3
The enzyme catalyzed polymerization of luminol (5-amino-2, 3-dihydroxy-1, 4-phthalazinedione) in the presence of polystyrenesulphonate (SPS) is introduced. Polymerization was achieved using horseradish peroxidase (HRP) as a biocatalyst in a phosphate buffer at pH 8. A green, water-soluble conducting PLUM/SPS complex was obtained. The physico-chemical properties of the product, including possible photoluminescence of the PLUM/SPS complex, were studied. The PLUM/SPS complex was shown to be a chemiluminescent (CL) material that is highly sensitive towards Fe^3+ ions. The quantum yield of the PLUM chemiluminescence was determined to be moderate (0.09 ± 0.01) compared to other chemiluminescent compounds. UV-visible, FTIR, ^1H NMR, GPC and conductivity measurements confirmed that the electroactive form of polyluminol (PLUM) was formed and complexed to the SPS.
Design and Implementation of Fully Automated Solar Powered Irrigation System
Mohammad Fawzi Al Ajlouni,Essam Ali Al-Nuaimy,Salman Abdul-Rassak Sultan,Ali Hammod AbdulHussein Twaij,Al Smadi Takialddin International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.4
This paper presents a fully automated stand-alone irrigation system with GSM (Global System for Mobile Communication) module. Solar energy is utilized to power the system and it is aimed to conserve water by reducing water losses. The system is based on a DC water pump that draws energy from solar panels along with automated water flow control using a moisture sensor. It is also fitted with alert and protection system that consists of an ultrasonic sensor and GSM messages sender that transmits signals showing the levels of the water in the reservoir and the battery charge. The control system is designed to stop the water pump from pumping water either when the battery level drops to equal or less than 10% of its full charge, or when the water level becomes less than 10 cm high in the reservoir. The experimental results revealed that the system is appropriate to use in remote areas with water scarcity and away from the national grid.