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In current research, Pseudomonas putida @ Chitosan hybrid biosorbent capability for U(VI) biosorption in a fixed bed column was investigated. The results showed that the increase in inlet concentration from 50 to 200 mg/L increased the biosorption capacity from 188.75 to 429.28 mg/g. In the column system, the sorption capacity was higher than that of the batch system because fixed bed column make best use of the inlet concentration difference as sorption driving force. Decrease in inlet flow rate through increase in the residence time for better diffusion or interaction as well as greater access to binding sites for uranium ions caused an improvement in column performance. Decline in the biosorption capacity due to increase in the inlet flow rate demonstrated that intraparticle diffusion was the rate-controlling step. With decreasing in the sorbent particle size from 1.5 to 1 mm, a significant increase in the biosorption capacity from 179.02 to 296.87 mg/g was achieved. FTIR and potentiometric titration confirmed that while –NH₃⁺ was the dominant functional group in the chitosan, –NH₃⁺, –NH₃, –OH, –COOH were responsible for the hybrid biosorbent. In conclusion, the present study indicated that Pseudomonas putida @ Chitosan could be a suitable biosorbent for U(VI) biosorption from aqueous solution in the continuous system.

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With growing environmental pollution and concerns about fossil fuel depletion worldwide, there is an urgent need to find a solution for this problem. Using alternative fuels, such as natural gas, which can burn much cleaner than petrol or gasoline and as an advantage, it’s much cheaper than other conventional fuels and is much more widely available than oil in our planet. The most effective way we can utilize this alternative fuel in the common internal combustion engine, is by means of direct injection technology. Before natural gas can be utilized in common automotive engines, it’s necessary to conduct simulations and thus optimize these engines to maximize output power prior being built. Optimizing engines can only be achieved through simulation. KIVA-3V is a well-accepted engine simulation tool, recognized by industrial users and researchers. KIVA-3V lacks the ability to simulate gaseous fuel injections as it’s only designed to deal with liquid fuels. In this research, researched the governing equations on gas injections and used them to develop a numerical code for KIVA-3V to enable simulation of gaseous injections. We validated our modified version of KIVA-3V with two different sets of experimental data which we previously had. We showed our modified KIVA-3V code can effectively simulate gaseous injections producing very exact results. The gaseous fuel considered in this research is pure methane.

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Physical and social development of the cities and their transformation to heterogeneous social and cultural centers result in increasing the urban abnormalities. Occurring any kinds of crimes and social abnormalities has led to the important role of environment and physical in controlling and preventing delinquency for the urban planners. In this respect, the aim of the present study is to examine the selected effective environmental-physical indices on the occurrence of crimes in police station no.15 (Camploo) of Ahvaz. This study is applied-developmental and is done in descriptive-analytical method. Graphical analyzes in GIS environment have been employed for analyzing the data. Results show that mean center of the occurred crimes in Camploo region is consistent with geographical center of police station (Revolution Street) and the crimes related to the rubbery have been distributed in whole region. With regarding to this fact that communicative network in this region is squared and the inputs of this region are terminated to suburb and criminal regions, a suitable field has been created for the escape of criminals. Also because of inadequate lighting and its undesirable quality in the streets of this region, it can be said that the selected indices of this investigation play significant roles in accelerating the crime occurrence in the studied region.

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