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Aims: Adolescents are among one of the most vulnerable populations, and the COVID-19 pandemic has led to rapid and unprecedented changes in the lives of millions of adolescents around the world. The present study aimed to evaluate the health-promoting behaviors among female Iranian adolescents during the COVID-19 pandemic.
Instrument & Methods: In this descriptive-analytical study, 529 female students from Saveh, Iran high schools were selected by multi-stage sampling and participated in the study. Data were collected using the Demographic Information and Health Promoting Lifestyle Profile (HPLPII). Data were analyzed using ANOVA and independent t-tests in SPSS 21.
Findings: The results showed that the mean and standard deviation of the health-promoting behavior score was moderate (89.3±11.2). Among the dimensions of HPLPII, the highest scores were related to health responsibility, nutrition, physical activity, and stress management. There were significant differences in mean scores across numerous health-promoting behavior domains and father’s occupation status, mother’s education level, hobby type, and participants' academic status.
Conclusion: Moderate overall mean score of health-promoting behaviors and low mean scores across stress management and physical activity domains suggest that female youth require resources to improve health behaviors, particularly during the ongoing pandemic.
 

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Aims: Depression, anxiety, and psychiatric symptoms are more prevalent among women than men. Given the significance of depression literacy and its associated factors, this study aimed to explore the level of depression literacy and its correlation with depression stigma and attitudes toward seeking help among Iranian women attending health centers in Saveh City.
Instrument & Methods: This cross-sectional study assessed 280 women aged 18-65 selected through cluster sampling from September 2023 to December 2023 in Saveh County, Iran. Reliable and validated tools, including the D-Lit Questionnaire, Attitude Toward Seeking Professional Psychological Help Scale, and DSS-Personal Subscale were utilized for data collection. Data analysis was conducted using independent samples t-test and one-way ANOVA. Predictors were identified through hierarchical linear regression analysis.
Findings: The lowest correct answer rate was associated with knowledge of available treatment methods (15.4%). The mean scores for D-Lit, attitude toward seeking help, and personal depression stigma were 41.36±4.83, 23.63±3.69, and 25.39±4.36, respectively. Education level, consultation with a psychologist, attitude toward seeking help, and depression stigma collectively accounted for approximately 23% of the variance in depression literacy.
Conclusions: The level of depression literacy among Iranian women is insufficient.

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The design of combustor has long been the most challenging portion in the design process of a gas turbine. This paper focused on the conceptual design methodology for aircraft combustors. The necessity of this work arose from an urgent need for a comprehensive model that can quickly provide data in the initial phases (conceptual design and preliminary design) of the design process. The proposed methodology integrated the performance and the design of combustors. To accomplish this, a computer code has been developed based on the design procedures. The design model could provide the combustor geometry and the combustor performance. Based on the available inputs data in the initial phases of the design process, a chemical reactor network (CRN) approach is selected to model the combustion with a detailed chemistry. In this way, three different chemical mechanisms are studied for Jet-A aviation fuel. Furthermore, the droplet evaporation for liquid fuel and the non-uniformity in the fuel-air mixture are modelled. The results of a developed design tool are compared with data of an annular engine’s combustor. The results have good agreement with the actual geometry and outputs of engine test rig emissions.

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Aside from its beneficial nutritional effects, chocolate causes but some problems for the consumer due to its high calorie. Use of good alternatives to fat and sugar is one of the ways to reduce these problems. In this study, the effects of isomalt and stevia on the qualitative properties for physicochemical rheological and sensorial characteristics of Low-calorie milk chocolate were investigated. Increased isomalt and stevia contents had no significant (p≤0.05) effect on fat, water activity, acidity, and color indexes L*, a*, b*, while they had significant (p≤0.05) effect on moisture, ash, and calorie. i. e. as the amount of isomalt and stevia increased, hardness, and calorie decreased and moisture, ash, and water activity increased. Of the two mathematical models evaluated to predict the rheological properties of chocolate, the Herschel Balkley model was found to be the most appropriate model for this purpose. Overall acceptability of the samples decreased with increasing stevia and isomalt substitution rates. Considering the best scores of physicochemical and sensory properties, T3 (60% Isomalt and Stevia +40% Sugar) was selected as the superior treatment.
 

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Now a days gas turbines are widely used in the transportation and energy industry. According to Combustion of fossil fuels in these engine, environmental concerns have increased due to production of nitrogen oxides and carbon monoxide. Various methods have been offered to reduce the emission of pollutants. One of these methods is adding steam or water to the combustion chamber to reduce the flame temperature. Different methods can be applied to add steam to the combustion chamber, in this study, the steam is added to the diffuser and premixed with air into the combustion chamber. Steam addition influences the combustion process inside the combustion chamber, which should be considered during the combustion chamber design process. Therefore, a model for the conceptual design of the chamber geometry and the effect of adding steam on it will be presented. For this purpose, the data from an actual combustion chamber will be used to compare results of geometry design by using this model and to study the influence of steam on the chamber geometry. To investigate the combustion chamber performance, the chemical reactor network method for combustion modeling will be used. First, with this procedure an annular conventional combustion chamber will be modeled without steam addition and the results of this method will be compared with the actual data of this combustor. Then the effect of adding steam on the performance will be investigated. The study will show adding steam is an effective way to reduce the flame temperature and emission of pollutants.

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The idea of designing new geometries for catalytic bed in the decomposition chamber of monopropellant thrusters is introduced with numerical simulations of pore-scale turbulent flows. The LES numerical technique is used for simulation of turbulent structures in the flow-field. The efficiency and reliability of the results obtained from numerical simulation have been determined by solving a benchmark problem of turbulent flow over the pack of cubes. The results show very good agreement with the experimental data, indicating the accuracy of the used model and numerical solution process. The characteristics of turbulent flow over two different geometries have been investigated using the numerical method. The results have been analyzed to evaluate the effectiveness of geometrical changes on the parameters associated with the catalytic reaction. All simulations have been conducted for cold flow, and the exact effects of the geometrical design of porous bed on reactive flow have not been quantified. The eddy dissipation and length scales of turbulence have been considered as the main parameters, because of their effect on rates of turbulent mixing and rate of reaction. The difference between the turbulent dissipation and length scales in the investigated flows in two different geometries indicates the effectiveness of the geometrical changes of the porous bed on the flow characteristics. Coherent structures are seen in the new geometry and the wall shear stress is reduced significantly, which increases the life of the catalytic coating.

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