Introduction: The Iranian Brain Imaging Database (IBID) was initiated in 2017, with 5 major goals: provide researchers easy access to a neuroimaging database, provide normative quantitative measures of the brain for clinical research purposes, study the aging profile of the brain, examine the association of brain structure and function, and join the ENIGMA consortium. Many prestigious databases with similar goals are available. However, they were not done on an Iranian population, and the battery of their tests (e.g. cognitive tests) is selected based on their specific questions and needs. Methods: The IBID will include 300 participants (50% female) in the age range of 20 to 70 years old, with an equal number of participants (#60) in each age decade. It comprises a battery of cognitive, lifestyle, medical, and mental health tests, in addition to several Magnetic Resonance Imaging (MRI) protocols. Each participant completes the assessments on two referral days. Results: The study currently has a cross-sectional design, but longitudinal assessments are considered for the future phases of the study. Here, details of the methodology and the initial results of assessing the first 152 participants of the study are provided. Conclusion: IBID is established to enable research into human brain function, to aid clinicians in disease diagnosis research, and also to unite the Iranian researchers with interests in the brain.

Flotation of mixed copper oxide–sulfide ores remains challenging due to low natural floatability of oxide minerals and complex interplay between sulfidization and collector adsorption. This study investigated the combined effect of NaHS-assisted sulfidization and 2,5-dimercapto-1,3,4-thiadiazole (DMTD), an azole-based collector, in terms of enhancing copper recovery from a mixed oxide–sulfide ore. The effects of pulp pH, DMTD, NaHS, and sodium metasilicate dosages, together with pulp solid concentration, were evaluated using response surface methodology. The quadratic model showed high predictive capability (R² = 0.9361), identifying NaHS dosage as the most influential factor. Optimum operating conditions (pH 9.50, DMTD 200 g/t, NaHS 750 g/t, sodium metasilicate 500 g/t, and 25% solids) yielded 64.03% copper recovery. Compared with the plant collector (PAX, Potassium Amyl Xanthate), DMTD increased recovery by 12.6% for highly oxidized ore while producing a higher concentrate grade. Density Functional Theory (DFT) calculations provided molecular insights into the experimental observations, confirming DMTD’s high affinity for sulfidized surfaces. Hybrid solvation models revealed greater thermodynamic stability (ΔE_ads = −6.74 eV) than PAX due to hydrogen bonding with explicit water molecules, while the smaller HOMO–LUMO gap (ΔE_gap = 0.86 eV) supported its superior electron transfer capability and reactivity. These findings demonstrate that NaHS-assisted sulfidization with DMTD is an effective strategy for improving flotation of copper oxide–sulfide ores.