Measurement of deuterium concentration in heavy water utilizing prompt gamma neutron activation analysis (PGNAA) in comparison with MCNPX simulation results

Salahi Saeed,Mokhtari Dorostkar Mahdieh,Abdi Saray Akbar 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11

Considering the importance of deuterium in nuclear science including medical and industrial researches such as (BNCT) and nuclear reactors respectively, it is important to study various possible ways in addition to common methods for measuring its concentration. This study is an effort to measure deuterium concentration using PGNAA. The main idea is to calculate the area under 2.23 MeV gammarays photo peak resulting from neutron collision with Hydrogen atoms which are in mix with deuterium in samples. The study carried out by both simulation and experiment. Monte Carlo MCNPX2.6 code has been used for simulation and based on its acceptable results an experimental setup has been arranged. The coordination of results was in the range of R ¼ 0.99 and R ¼ 0.98 in simulation and experiment respectively. The accuracy of the study has been investigated by measuring the concentration of an unknown sample by both PGNAA and Fourier transform infrared spectroscopy (FT-IR) methods in which there were acceptable correlation between these two methods.

Experimental investigation and modeling of industrial oily wastewater treatment using modified polyethersulfone ultrafiltration hollow fiber membranes

Abdolhamid Salahi,Toraj Mohammadi,Reza Mosayebi Behbahani,Mahmood Hemmati 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.6

Hollow fiber membranes were prepared from polyethersulfone/additives/NMP&DMSO system via phase inversion induced by precipitation in non-solvent coagulation bath. The interaction effects of polyethylene-glycol (PEG), propionic-acid (PA), Tween-20, PEG molecular weight and polyvinyl-pyrrolidone (PVP) on morphology and performance of synthesized membranes were investigated. Taguchi method (L16 orthogonal array) was used initially to plan a minimum number of experiments. 32 membranes were synthesized (with two replications) and their permeation flux and TOC rejection properties to oily wastewater treatment were studied. The obtained results indicated that addition of PA to spinning dope decreases flux while it increases TOC rejection of prepared membranes. Also, the result shows that addition of PVP, Tween-20 and PEG content in spinning dope enhances permeation flux while reducing TOC rejection. The obtained results indicated that the synthesized membranes was effective and suitable for treatment of the oily wastewater to achieve up to 92.6, 98.2, and 98.5% removal of TOC, TSS, and OGC, respectively with a flux of 247.19 L/(m2h). Moreover, Hermia’s models were used for permeation flux decline prediction. Experimental data and models predictions were compared. The results showed that there is reasonable agreement between experimental data and the cake layer model followed by the intermediate blocking model.

A Serological Study on Toxoplasma gondii Infection Among People in South of Tehran, Iran

Abdoreza Salahi-Moghaddam,Abbas Hafizi 대한기생충학열대의학회 2009 The Korean Journal of Parasitology Vol.47 No.1

Mitochondrial DNA 4977-bp deletion in endometriosis

Elnaz Salahi,Zivar Salehi,Ziba Zahiri,Saeedeh Sadri,Niloofar Khoshdel Rad 한국유전학회 2013 Genes & Genomics Vol.35 No.5

Endometriosis is a multifactorial gynecological condition characterized by the presence of ectopic endometrial and stromal tissue outside the uterus. Free radicals and Oxidative stress have been proposed to be involved in the pathogenesis of the endometriosis. It has been shown that mitochondrial DNA (mtDNA) is particularly susceptible to oxidative damage and mutations due to the high rate of reactive oxygen species production and limited DNA repair capacity in mitochondria. While a number of deletions can occur, the most commonly studied in human is a 4977-bp deletion that removes all or parts of the genes for NADH dehydrogenase subunits 3, 4, 4L and 5, cytochrome C oxidase subunit III and ATP synthase subunits 6 and 8.’’ We evaluated whether mtDNA common deletion is related with the susceptibility to endometriosis in northern Iran. In this study 80 endometriosis cases and 100 controls were enrolled. Total DNA was extracted from endometrial tissue samples. The mitochondrial common deletion was determined by Gap- polymerase chain reaction (Gap-PCR). It was found that the mitochondrial common deletion was more likely to be present in patients with endometriosis. Assessing indicate that 60 % of patients and 8 % of controls show mtDNA 4977-bp deletion (Odds Ratio [OR] = 17.25, P\0.0001, confidence interval [CI] = 5.18–57.36). The mtDNA 4977 deletion may play a role in endometriosis. Further studies with larger numbers of patients are required for further evaluation and confirmation of our finding.

Poly(lactic acid) Nanofibrous Scaffolds Containing Aspirin-loaded Zeolitic Imidazolate Frameworks: Morphology, Drug Release, Hemocompatibility and Shape Memory Studies

Fatemeh Salahi Chashmi,Mehrdad Khakbiz,Payam Zahedi,Mahboubeh Kabiri 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8

Using poly(lactic acid) (PLA) as biodegradable and biocompatible material is demanded for vascular scaffoldsespecially a susceptible substitute of permanent metal stents in treatment of coronary heart disease. In this work, PLAnanofibers containing aspirin (Asp) loaded into zeolitic imidazolate framework nanoparticles (ZIF-8@Asp NPs) wereprepared for vascular tissue application. In this line, ZIF-8@Asp NPs were synthesized, and their characterization revealedtheir average NP size and the drug loading efficiency of approximately 180 nm and 76 %. Afterward, ZIF-8@Asp NPs wereloaded into PLA nanofibers and the obtained results showed a uniform morphology with an average nanofibers diameter ofaround 544 nm, Young’s modulus of 1.7 MPa, and the ultimate drug release of 19 % after six days. Besides degradationstudies of the sample, the addition of ZIF-8@Asp NPs to the PLA nanofibers displayed no adverse effect on the shaperecovery properties. Finally, the hemolysis and platelet adhesion confirmed that the surface of the ZIF-8@Asp-loaded PLAnanofibrous samples exhibited appropriate hemocompatibility.

High Frequency of blaOXA-48like Producing Klebsiella pneumoniae Isolated from Nosocomial Infection in Azerbaijan, Iran

Ghotaslou Reza,Salahi Behnaz,Naderi Ghazal,Alizadeh Naser 대한감염학회 2023 Infection and Chemotherapy Vol.55 No.1

Background: Klebsiella pneumoniae is one of the significant agents of hospital-acquired infections. In recent years, carbapenem-resistant K. pneumoniae (CRKP) isolates have been found in numerous epidemics of nosocomial infections. This study aimed to determine carbapenem resistance mechanisms and molecular epidemiological of CRKP infections in Azerbaijan, Iran. Materials and Methods: A total of 50 non-duplicated CRKP from January 2020 to December 2020 were isolated form Sina and Imam Reza Hospitals in Tabriz, Iran. Antimicrobial susceptibility testing was performed by the disk-diffusion method. The carbapenem resistance mechanisms were determined by the phenotypic and PCR procedures. CRKP isolates were typed by the Random Amplified Polymorphic DNA PCR (RAPD-PCR) technique. Results: Amikacin was the most effective antibiotics against CRKP isolates. AmpC overproduction was observed in five CRKP isolates. Efflux pump activity was found in one isolate by the phenotypic method. Carba NP test could find carbapenemases genes in 96% of isolates. The most common carbapenemases gene in CRKP isolates were blaOXA-48-like (76%) followed by blaNDM (50%), blaIMP (22%), blaVIM (10%), and blaKPC (10%). The outer membrane protein genes (OmpK36 and OmpK35) were identified in 76% and 82% of CRKP isolates, respectively. RAPD-PCR analysis yielded 37 distinct RAPD-types. Most blaOXA-48-like positive CRKP isolates were obtained from patients hospitalized in intensive care unit (ICU) wards with urinary tract infections. Conclusion: The blaOXA-48-like is the main carbapenemase among CRKP isolates in this area. Most blaOXA-48-like producer CRKP strains were collected from the ICU ward and urine samples. To control infections due to CRKP, a strict control program in hospital settings is required.

Letter to the Editor : A Case of Behcet`s Disease with Massive Lower Gastrointestinal Bleeding

( Hamed Choddusi Johari ),( Roohollah Salahi ) 대한소화기학회 2011 대한소화기학회지 Vol.57 No.5

Synthesis, morphology control, and application of hollow Al2O3 spheres in the steam methane reforming process

Maryam Meshksar,Fatemeh Salahi,Fatemeh Zarei-Jelyani,Mohammad Reza Rahimpour,Mohammad Farsi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-

This research focuses on controlling the morphology and crystalline phase of hollow Al2O3 spheres as asupporting material of Ni-based catalysts for the first time, which is then applied as a catalyst of hightemperaturesteam methane reforming (SMR) process. For this purpose, the effects of hydrothermal time,the concentration of alumina salt, and calcination temperature on the structure of support are investigatedand adjusted and then loaded with 15–25 wt.% Ni contents. The morphology of synthesized hollowalumina samples and 20Ni/H-Al2O3 catalyst before and after reaction are characterized using XRD,FESEM, TEM, H2-TPR, CO2-TPD, EDX, FTIR, N2 adsorption/desorption, and mapping techniques. Thehydrothermal time of 72 h, calcination temperature of 800 C, and alumina salt concentration of1.00 M resulted in the spherical morphology of hollow Al2O3 with 236.26 m2/gr surface area and highcrystallinity. Among different Ni loadings, 20Ni/H-Al2O3 had the highest CH4 conversion of 87.75% andH2 yield of 92.09% at 700 C. This catalyst also depicted stable performance during 12 h SMR reactionat 700 C with low carbon deposited contents.

Microstructural development and mechanical properties of nanostructured copper reinforced with SiC nanoparticles

Akbarpour, M.R.,Salahi, E.,Hesari, F.A.,Yoon, E.Y.,Kim, H.S.,Simchi, A. Elsevier Sequoia 2013 Materials science & engineering. properties, micro Vol.568 No.-

Nanostructured Cu and Cu-2vol% SiC nanocomposite were produced by high energy mechanical milling and hot pressing technique. Microstructure development during fabrication process was investigated by X-ray diffraction, scanning electron microscope, scanning transmission electron microscope, and electron backscatter diffraction techniques. The results showed that the microstructure of copper and copper-based nanocomposite composed of a mixture of equiaxed nanograins with bimodal and non-random misorientation distribution. The presence of SiC nanoparticles refined the grain structure of the copper matrix while the fraction of low angle grain boundaries was increased. Evaluation of mechanical properties by compression test showed enhanced yield strength from 505+/-17MPa for the nanostructured copper to 630+/-12MPa for the reinforced metal with 2vol% SiC. We correlated the strength of the nanostructured materials to their microstructural features based on the strengthening mechanisms. The contribution of different mechanisms including Orowan strengthening, high angle grain boundaries, and density of dislocations were analyzed. It is shown that the high angle grain boundaries in nanostructured materials play a significant role in the strengthening mechanism. The effect of nanoparticles is presented and discussed.

Fabrication, characterization and mechanical properties of hybrid composites of copper using the nanoparticulates of SiC and carbon nanotubes

Akbarpour, M.R.,Salahi, E.,Alikhani Hesari, F.,Simchi, A.,Kim, H.S. Elsevier Sequoia 2013 Materials science & engineering. properties, micro Vol.572 No.-

Copper based hybrid composites containing nano-sized silicon carbide and carbon nanotubes reinforcements with minimal porosity were fabricated via mechanical milling followed by hot pressing technique. Microstructures of the powders and consolidated materials were studied using scanning electron microscope, X-ray diffraction, Raman spectroscopy, and scanning transmission electron microscope. Microstructural characterization of the materials revealed that the addition of nanosized silicon carbide reinforcement lowered the grain growth rate and enhanced the homogenization during mechanical milling. Microhardness measurements and compression test showed considerable improvements in mechanical properties of the composites due to the addition of nanoparticulates and the grain refinement. The strength of the composite materials was discussed using theoretical models of the Hall-Petch, Orowan, and thermal mismatch mechanisms to determine the contribution of each mechanism in total strength.