INTRODUCTION: Questions have a fundamental role in human and natural sciences. Many fields in human and natural sciences explore their subject matters through different kinds of questions. The team of the Ontology of Questions aims at providing a philosophical analysis and categorization of questions (except rhetorical and ironic ones), from different academic areas. Our categorization is based...

in despite of all progress in technology in mining industry, still labor is one of the key factors in mining operation. this paper presents a system dynamics approach to evaluate the mining labor productivity. therefore, after the identification of main effective variables, two quantitative and qualitative models were built. the qualitative model illustrates the complex interrelated structure o...

we studied 11 gaps covered with beech saplings (< 1.30 m tall) in a reserve compartment (compartment 139, district one, langa forest, watershed 36: kazemrood) of the caspian beech forest in n iran. two transects, each 2 m wide, were laid along the longest (n-s) and shortest (e-w) axis of each gap. five micro sample plots, each 4 m2, were established: one at the center, and one at each corner. q...

this research has used a mixed methodology with both quantitative and qualitative approaches. the study population included three groups; the post-graduate students, professors and academic staff at two universities, khouzestan ramin agriculture and natural resources university and bu-ali sina university. for collecting quantitative data among 320 students, 175 were selected using random sampli...