فهرست مطالب علی ایرانپور

This test was done in the hydraulic laboratory of Khuzestan Water and Electricity Organization. The flume used had a rectangular cross-section with a length of 7 meters and a width of 0.6 meters. The walls of the flume were 10 mm thick and made of glass. In this experiment, 10 flow rates (from 10 to 50 liters per second) were used in free flow mode in the flume. Three piano keyboard overflows with different baffles were used. Baffles were circular, pentagonal and cubic. The overflows were made of transparent plexiglass with a thickness of 5 mm. The numerical model of Flow3D software was used to check the amount of energy consumption and compare the baffles. The highest energy loss with increasing yc/H occurred in cubic, circular and pentagonal baffles, respectively. The highest energy loss with increasing yc/H is in cubic, circular and pentagonal baffles, respectively. The energy loss in cubic, circular and pentagonal baffles was 0.65, 0.62 and 0.61, respectively. Therefore, the best result happened in the cubic baffle. By changing the height of the baffles, it was observed that the highest energy loss was measured at a height of 2 cm and the lowest value was measured at a height of 1 cm. It is recommended to use cubic baffles for more energy loss in piano key overflows. The best shape and dimensions of the baffle for this work are cubic and 2 * 2 cm.

Developing the necessary competencies for holding managerial positions and also presenting a model for selecting the right person from among the talented is the main condition for the realization of the meritocracy system. so the aim of this study was to determine the Comparison of professional competencies of managers government sports organizations according to management levels. This study is a combination of research and the research design is exploratory. It is also practical in terms of purpose and nature. For this purpose, firstly, by in-depth study of the literature, the basic criteria of professional competencies were extracted and the initial model was developed. In the qualitative section, 18 people (16 men and 2 women) from professors and experts in sports management in universities across the country, the ministry of sports and youth and cultural and sports clubs were selected by sampling method of a network of specialists and semi-structured interviews were conducted with them to modify or adjust the criteria and sub-criteria of the original model. Based on the results of the pre-model interview analysis, the modification and sub-criteria were determined. Finally, data were collected using the research tool of researcher questionnaire. In a quantitative part, the statistical population of managers of sports organizations in Isfahan province was 5101 people. The sampling method of this stratified random sampling study (management level) was proportional to the sample size and based on Krejcie and Morgan table, 361 people were statistically sampled. After conducting a preliminary study and determining the variance of the questions; Through Cronbach's alpha coefficient, reliability coefficient of the questionnaire was 0.91. Analysis of variance was used to analyze the findings of this study.Professional competencies in managers of government sports organizations were: sport commercialization procedure, risk management skills, professional ethics-based organizational culture, responsibility with consequentialism, and performance management with learning at different levels of management (top, Middle and lower) were significantly different. sports managers at different levels can improve their technical and behavioral abilities by acquiring the necessary skills in this area. Also, managers use positive and natural feedback behaviors to understand the consequences of positive reactive behaviors.

Periodontal diseases are among the most prevalent inflammatory diseases caused by oral bacteria. Expansion of oral biofilm causes various diseases such as gingival inflammation and periodontitis. The Satureja plant has various species, all of which are aromatic. This plant is traditionally used for the treatment of some diseases. The present study was conducted to evaluate the effect of Satureja essential oil on periodontal pathogens.

In this study, we evaluated four pathogens; Enterococcus faecalis, Streptococcus sanguinis, Eikenella corrodens, and Actinomyces viscosus. We also used the disk diffusion test and broth microdilution method to evaluate the antimicrobial effect of Satureja essential oil. Finally, we determined the minimum inhibitory concentration and minimum bactericidal concentration.
Ethical Considerations The Ethics Committee of Arak University of Medical Sciences approved this study (Code: IR.ARAKMU.REC.1397.67).

In concentration of 0.1 g/mL of Satureja plant, Actinomyces viscosus, Streptococcus sanguinis, Enterococcus faecalis, and Eikenella corrodens were found to be sensible to resistance. The Satureja essential oil had the highest effect on Eikenella corrodens. Results obtained from the biofilm test showed no biofilm in a concentration of 12.5 mg/mL and higher of Satureja plant.

The Satureja plant was found to have an antibacterial and inhibitory effect on biofilm growth and formation in the oral cavity.

Aflatoxin M1 (AFM1) is a hepatocarcinogen found in milk of animals that have consumed feeds contaminated with aflatoxin B1 (AFB1). This study was undertaken to determine the presence and levels of aflatoxin M1 (AFM1) in Iranian white cheese consumed in Isfahan and Shahr-e Kord, Iran. A total of 70 cheese samples were randomly obtained from retail outlets. Enzyme Linked Immuno Sorbent Assay (ELISA) technique was used to determine the presence and the level of AFM1. In 45 of the 70 cheese samples examined (64.3%), the presence of AFM1 was detected in concentrations between 44ng/kg and 719ng/kg. The mean level of AFM1 of positive samples was 218.8 ng/kg. AFM1 in 10 samples (14.3%) were higher than the maximum tolerance limit (250 ng/kg) accepted by the European countries. Statistical analysis showed that there were no significant differences (p>0.05) between the mean concentrations of AFM1 in cheese samples produced in spring and summer. It was concluded that widespread occurrence of AFM1 in Iranian white cheese samples were considered to be possible hazards for public health especially children.