First-principles investigation on stability and electronic structure of Sc-dopedθ′/Al interface in Al−Cu alloys

The properties of Sc-dopedθ′(Al_(2)Cu)/Al interface in Al−Cu alloys were investigated by first-principles calculations.Sc-doped semi-coherent and coherentθ′(Al_(2)Cu)/Al interfaces(Sc doped in Al slab(S1 site),Sc doped inθ′slab(S2 site))were modeled based on calculated results and reported experiments.Through the analysis of interfacial bonding strength,it is revealed that the doping of Sc at S1 site can significantly decrease the interface energy and increase the work of adhesion.In particular,the doped coherent interface with Sc at S1 site which is occupied by interstitial Cu atoms has very good bonding strength.The electronic structure shows the strong Al—Cu bonds at the interfaces with Sc at S1 site,and the Al—Al bonds at the interfaces with Sc at S2 site are formed.The formation of strong Al—Cu and Al—Al bonds plays an important role in the enhancement of doped interface strength.

Satisfaction about Patient-centeredness and Healthcare System among Patients with Chronic Multimorbidity

The aim of the present study was to measure the prevalence of multimorbidity in Bangladesh,India and China,and to assess the relationship between multimorbidity and patient's opinion regarding their involvement in healthcare decision-making and overall satisfaction of healthcare system.Cross-sectional data on 18696 men and women aged 18 and above were collected from the World Health Survey of World Health Organization(WHO).Outcome variables were subjective rating of(1)healthcare system's ability to involve patients in decision-making,and(2)satisfaction with the way healthcare system runs in the country.Self-reported chronic conditions were used to measure the prevalence of multimorbidity.Out of 9 chronic conditions,back pain,arthritis,and chronic cough appeared to be the most prevalent ones among majority of the participants.About one-third of the participants in China(30.7%)and two-thirds in Bangladesh(66.1%)and India(66.6%)reported having at least one chronic illness.Prevalence of multimorbidity was highest in India(34.3%)followed by Bangladesh(28.8%)and China(14.3%).In Bangladesh,India and China,respectively 70.5%,41.7%,61.3%women and 54.5%,42.8%and 58.8%men expressed dissatisfaction regarding the way healthcare system runs in their country.In Bangladesh and India,men who were living with multimorbidity were more likely to rate the patient-centeredness as"bad"than those who had no disease illness.This study suggests that the prevalence of multimorbidity was remarkably high especially in Bangladesh and India.Higher likelihood of dissatisfaction about healthcare system among multimorbid patients might be indicative of inadequacy in the provision of care in qualitative and quantitative terms.