The relationship of anxiety, stress, and depression with suicidal thoughts among female adolescents: The meditating role of victim of bullying

Introduction: Bullying is a form of low-level violence in the school environment that if unnoticed to become dangerous forms of violence occurs. The aim of this study was examining the relationship between anxiety, stress and depression and female adolescents' suicidal thoughts with the meditating role of the victim of bullying. Materials and Methods: This study is descriptive and has used the correlation method. For this purpose in the academic year 2016-2017, 300 students of high school girl students (seventh and eighth grade) of public schools of Pakdasht city were selected by random cluster sampling method and they filled in the suicidal thoughts, anxiety, stress, depression and victim of bullying questionnaire. For data analysis, Pearson’s correlation method and structural equation modeling were used by using SPSS-19 and LISRELV8.80 software. Results: Pearson’s correlational results showed that there is a positive and meaningful relation between anxiety, stress, depression and victim of bullying with suicidal thoughts (P≤0.01). Also the victim of bullying variable has a meditating role in relation among research variable and all of the direct and indirect effects of anxiety, stress, depression and victim of bullying on suicidal thoughts are meaningful.  Conclusion: The results indicate that anxiety, stress, depression along with victim of bullying in female adolescents cause suicidal thoughts therefore preventing and reducing the risk at schools is absolutely necessary

A new force field for the adsorption of H₂, O₂, N₂, CO, H₂O, and H₂S gases on alkali doped carbon nanotubes

<p>The main goal of this work is the generation of a new force field data set to the interaction of several gases such as H₂, O₂, N₂, CO, H₂O, and H₂S with alkali cation-doped carbon nanotubes (CNTs) using <i>ab initio</i> calculations at the MP2(full)/6-311++G(d,p) level of theory. Different alkali cations including Li⁺, Na⁺_, K⁺ and Cs⁺ were used to dope in the CNT. The calculated potential energy curve for the interaction of each gas molecule with each alkali cation-doped CNTs was fitted to an analytical potential function to obtain the parameters of the potential function. A modified Morse potential function was selected for the fitting in which the electrostatic interactions has been accounted by adding the β/<i>r</i> term to the Morse potential. The accuracy of the calculated force field was checked via Grand Canonical Monte Carlo (GCMC) simulation of the H₂ adsorption on Li-doped graphite and Li-doped CNT. The results of these simulations were compared with the experimental measurements and the closeness of the simulation results with the experimental data indicated the accuracy of the proposed force field. The main merit of this work is the derivation of a specific force field for interaction of each of six gases with four alkali cation-doped CNT, which can be used in molecular simulation of these 24 of systems. The simulation results showed the increase of the H₂ adsorption capacity of nanotube and graphite up to 50% and 10%, respectively, due to the insertion of Li ions.</p> <p></p

Recent progress on hybrid nanofluids in heat transfer applications: a comprehensive review

Hybrid nano fluids are potential fluids that offer better heat transfer performance and thermo physical properties than convectional heat transfer fl uids (oil, water and ethylene glycol) and nano fluids with single nanoparticles. Hybrid nano fluid is a new nanotechnology fl uid that is synthesized by dispersing two different nanoparticles into conventional heat transfer fluid. Recently, researchers have indicated that hybrid nano fluids can effectively substitute the convectional coolant especially those working at very high temperatures. In this paper a comprehensive literature on synthesis of hybrid nanoparticles, hybrid nano fluid and thermophysical properties of hybrid nano fl uids have been compiled and reviewed. Finally, the challenges and future trends in the application of hybrid nano fluids in heat transfer applications are discussed

The Use of Nanofluids for Enhancing the Thermal Performance of Stationary Solar Collectors: A Review

Nanofluid, an advanced type of fluid containing small quantity of nanoparticles (usually less than 100 nm), has been proven to provide more efficient heat transfer compared to conventional fluids. The dispersion of a small amount of solid nanoparticles in conventional fluids such as water or ethylene glycol changes their thermal conductivity remarkably. Recently, nanofluid has been used as a heat transfer fluid to enhance the performance of solar collector devices. This paper reviews recent progress and applications of nanofluids in stationary solar collectors. In addition to reviewing the efficiency of solar collectors which use nanofluids, the paper also discusses the impact of nanofluid usage in solar collector based on economic and environmental viewpoints. Finally, the challenges and future trends related to the application of nanofluids in thermal solar collector is discussed