it is well known that the parabolic partial differential equationsin two or more space dimensions with overspecified boundary data,feature in the mathematical modeling of many phenomena. in thisarticle, an inverse problem of determining an unknowntime-dependent source term of a parabolic equation in generaldimensions is considered. employing some transformations, wechange the inverse problem to...

with rapid economic development and industrialization, the construction industry continues to rank among the most hazardous industries in the world. therefore, construction safety is always a significant concern for both practitioners and researchers. the objective of this study was to create a structural modeling of components that influence the safety performance in construction projects.we f...

background: there can be little doubt that the construction is the most hazardous industry in the worldwide. this study was designed to modeling the factors affecting unsafe behavior from the perspective of safety supervisors. methods: the qualitative research was conducted to extract a conceptual model. a structural model was then developed based on a questionnaire survey (n=266) by two stage ...

In this paper, we explore two modeling approaches to understanding the dynamics of infectious diseases in population: equation-based (EBM) and agent-based (ABM). To achieve this, a comparative study these was conducted highlighted their advantages disadvantages. Two case studies on spread COVID-19 pandemic were carried out using both approaches. The results obtained show that differential model...

this survey-study carried out among 360 randomly selected farmers living in drought-prone areas of fars province, iran, set out to investigate the perceptions and psychologi-cal coping strategies of farmers when facing drought. results showed that farmers per-ceived drought as a threat to all of their resources (material, conditions, personal, social and energies) and used emotion-focused and r...

background: to define underlying predictors of tobacco smoking among iranian teenagers in a generalized structural equation model. materials and methods: in this cross-sectional study, a generalized structural equation model based on planned behavioral theory was used to explain the relationship among different factors such as demographic factors, subjective norms, and the intention to tobacco ...

in this paper, we try to use modeling based on singular perturbation theory, in order to control satellite attitude during the wide rolling angle maneuvering through nonlinear h∞ control strategy. differential equations describing dynamics of the satellite are presented first, and by choosing the appropriate dynamic model for actuators and based on the standard singular perturbation model, the ...