محمدحسن ملائی

This work aims to investigate the effect of fuel ratio (ϕ) on the synthesis of CuO nanoparticles via solution combustion and evaluation of its antibacterial properties. Hexamethylenetetramine was considered as fuel and used in different ratio. The final products were characterized by XRD, DLS, FE-SEM analysis. The XRD results indicated that the highest quantity of CuO was found in ϕ=1. Based on particle size analysis results, all particles were in the range of 21.7 to 42.2 nms. Also, the finest particle size (21.7nm) was attributed to ϕ=1. Since the FE-SEM image of this specimen showed a spherical fine morphology, this specimen was chosen for antibacterial tests. In order to trace the second aim of this study, chosen specimen was tested against Escherichia coli and Staphylococcus aureus bacterial strains while suspended in nutrient broth, water and DMSO. The results revealed higher inhibition of E. coli (gram-negative strain) comparing to S. aureus (gram-positive strain) in all cases. Also, the CuO-nutrient broth appeared to be the suspension with the highest inhibitory for both bacterial strains. The Minimum inhibitory concentration of nanoparticles in this suspension are 105 and 242 µg/mL for E. coli and S. aureus. This could be related to the better dispersion of nanoparticles in nutrient broth solution. Therefore, it could be suggested that adding surfactants to suspension, can enhance the inhibition of bacterial strains.

This research aimed to study a causal model of the relationship among religion, psychological hardiness, worldism, and problem-solving among soldiers. 110 soldiers with different service years were selected by the simple random sampling among the population (soldiers of the Fourth Base of Air-Force in the city of Isfahan) and responded to worldism questionnaire (MASAD), Ahvaz Hardiness Inventory (AHI), Khodayarifard's religiosity questionnaire, and Social Problem-Solving Inventory-Revised (SPSI-R). The findings showed that a) religion directly affects problem-solving; b) religion also influences problem-solving by increasing hardiness and decreasing worldism. As a result, religion has an important role in facing life stresses and it can adjust the effects of severe crises in life

This study was conducted to qualitatively study the role of language in the relations between conflicting couples using grounded theory. To this end, the sample was selected using the purposive sampling method, and the data were collected through a semi-structured interview. To achieve theoretical saturation, seven couples from among the qualifying ones were studied. To obtain the factors, the data were analyzed using Strauss and Corbin techniques, which included coding concepts and shaping the theory. The analysis of data in open coding led to coding the main factors, components, and sub-components. After analyzing the interview data, the following items were identified: the linguistic conflicts of couples as the nuclear category, the linguistic factors paving the way for marital conflicts and the linguistic consequences of marital conflicts as main categories, and the four concepts of second level coding derived from the first level concepts, i.e. the linguistic factors weakening marital relationship, the linguistic factors aggravating marital conflicts, the linguistic factors destroying marital relationship, and the linguistic factors threatening marital relationship. The results revealed that language plays an important role in reducing or increasing marital conflicts, and failure to control it causes a lot of conflicts and verbal violence among couples, and, consequently, it paves the way for emotional separation and eventually divorce.