Strong metal-support interactions between highly dispersed Cu^(+) species and ceria via mix-MOF pyrolysis toward promoted water-gas shift reaction

The modulation of metal-support interfacial interaction is significant but challenging in the design of high-efficiency and high-stability supported catalysts.Here,we report a synthetic strategy to upgrade Cu-CeO_(2)interfacial interaction by the pyrolysis of mixed metal-organic framework(MOF)structure.The obtained highly dispersed Cu/CeO_(2)-MOF catalyst via this strategy was used to catalyze water-gas shift reaction(WGSR),which exhibited high activity of 40.5μmolCOgcat^(-1).s^(-1)at 300℃and high stability of about 120 h.Based on comprehensive studies of electronic structure,pyrolysis strategy has significant effect on enhancing metal-support interaction and then stabilizing interfacial Cu^(+)species under reaction conditions.Abundant Cu^(+)species and generated oxygen vacancies over Cu/CeO_(2)-MOF catalyst played a key role in CO molecule activation and H2O molecule dissociation,respectively.Both collaborated closely and then promoted WGSR catalytic performance in comparison with traditio nal supported catalysts.This study shall offer a robust approach to harvest highly dispersed catalysts with finely-tuned metal-support interactions for stabilizing the most interfacial active metal species in diverse heterogeneous catalytic reactions.

Visual analysis of shared medical appointments based on CiteSpace

Objective:Analyze the research hotspots and frontiers of shared outpatient service,and provide a reference for researchers in this field to carry out follow-up research.Methods:Search the Web of Science core collection database until 2022 and visually analyzekeywords in this field through CiteSpace5.8.R3 software,Results:A total of 261 iteratures were included.The research focuses mainly on advanced care planning,diabetes care,andgroup prenatal care,The research trend tends to be telemedicine and nursing provided by specialized nurses.Conclusion:Scholars can learn from the research hotspots of foreign shared medical appointments,pay attention to the research trend,expand its application scope in combination with China's national conditions,and further promote thedevelopment of shared medical appointments in China.

Bibliometric analysis of quality of life in peritoneal dialysis patients

Objective:Nowadays,the medical model is constantly changing,and the problem of how to improve the quality of life of peritoneal dialysis patients arises at a historic moment.This paper observes the publication and cooperation of research countries and institutions related to the quality of life of peritoneal dialysis patients,understands the research hotspots,explores the research trends,and provides a reference for further research by scholars.Methods:The search database was the Web of Science core collection,the search terms“peritoneal dialysis”and“quality of life”,the document type“Article or Review”,the language“English”and the period from 1985 to 2022.Results:A total of 1,597 literature were retrieved,and the number of documents showed an annual increase.The United States has the highest volume and centrality of publications and the most cooperation with other countries.The institution with the largest number of articles is the University of Toronto in Canada.The top three most highly cited documents were analyzed to derive the knowledge base of the research area.According to the analysis of keywords,there are high-frequency keywords such as“quality of life”and“peritoneal dialysis”and 11 keyword clusters.Understand the changing trends and frontiers in the research field through timeline maps and mutated words.Conclusion:The comparison of quality of life between peritoneal dialysis and haemodialysis and the study of factors influencing the quality of life is a hot research topic.With the gradual deepening of the research,it is suggested that future research should focus on the intervention research of influencing factors and clarify the intervention measures to improve patients’quality of life.

Boosting the water gas shift reaction on Pt/CeO_(2)-based nanocatalysts by compositional modification: Support doping versus bimetallic alloying

The water gas shift reaction is of vital significance for the generation and transition of energy due to the application in hydrogen production and industries such as ammonia synthesis and fuel cells.The influence of support doping and bimetallic alloying on the catalytic performance of Pt/Ce O_(2)-based nanocatalysts in water gas shift reaction was reported in this work.Various lanthanide ions and 3d transition metals were respectively introduced into the Ce O_(2)support or Pt to form Pt/Ce O_(2):Ln(Ln=La,Nd,Gd,Tb,Yb)and Pt M/Ce O_(2)(M=Fe,Co,Ni)nanocatalysts.The sample of Pt/Ce O_(2):Tb showed the highest activity(TOF at 200℃=0.051 s^(-1))among the Pt/Ce O_(2):Ln and the undoped Pt/Ce O_(2)catalysts.Besides,the sample of Pt Fe/Ce O_(2)exhibited the highest activity(TOF at 200℃=0.12 s^(-1))among Pt M/Ce O_(2)catalysts.The results of the multiple characterizations indicated that the catalytic activity of Pt/Ce O_(2):Ln catalysts was closely correlated with the amount of oxygen vacancies in doped ceria support.However,the different activity of Pt M/Ce O_(2)bimetallic catalysts was owing to the various Pt oxidation states of the bimetals dispersed on ceria.The study of the reaction pathway indicated that both the samples of Pt/Ce O_(2)and Pt/Ce O_(2):Tb catalyzed the reaction through the formate pathway,and the enhanced activity of the latter derived from the increased concentration of oxygen vacancies along with promoted water dissociation.As for the sample of Pt Fe/Ce O_(2),its catalytic mechanism was the carboxyl route with a higher reaction rate due to the moderate valence of Pt along with improved CO activation.

Effect of Montessori method on the cognitive and behavioral intervention of senile dementia patients:a meta-analysis

Background:To evaluate the effect of Montessori method on cognitive and behavioral function in patients with senile dementia by meta-analysis.Methods:The randomized controlled trials of the effect of Montessori method on cognitive and behavioral functions of Alzheimer’s patients in PubMed,Cochrane Library,Web of Science,Excerpt Medica Database,The Cumulative Index to Nursing&Allied Health Literature,Chinese BioMedical Literature Database,China National Knowledge Infrastructure,Weipu Information Chinese Periodical Service Platformdatabase and Wanfang database were searched by computer,and the references of relevant literatures were traced.Two researchers independently conducted literature screening,data extraction,evaluation and inclusion in the literature,using RevMan 5.4.1 software for meta-analysis.Results:A total of 11 literatures were included and 936 patients were enrolled.Meta analysis shows that compared with routine nursing,Montessori method is helpful to improve the overall cognitive function(standardized mean difference=1.53,95%confidence interval(1.32,1.73),P<0.01),activities of daily living and reduce the incidence of adverse events(relative risk=0.37,95%confidence interval(0.21,0.63),P<0.01)in patients with Alzheimer’s disease.Conclusion:Montessori method is helpful to improve the overall cognitive function,activities of daily living and reduce the incidence of adverse events in patients with senile dementia.Affected by the included study,it still needs to be confirmed by multi center and large sample randomized controlled study.

Various topological phases and their abnormal effects of topological acoustic metamaterials

The last 20 years have witnessed growing impacts of the topological concept on the branches of physics,including materials,electronics,photonics,and acoustics.Topology describes objects with some global invariant property under continuous deformation,which in mathematics could date back to the 17th century and mature in the 20th century.In physics,it successfully underpinned the physics of the Quantum Hall effect in 1984.To date,topology has been extensively applied to describe topological phases in acoustic metamaterials.As artificial structures,acoustic metamaterials could be well theoretically analyzed,on-demand designed,and easily fabricated by modern techniques,such as three-dimensional printing.Some new theoretical topological models were first discovered in acoustic metamaterials analogous to electronic counterparts,associated with novel effects for acoustics closer to applications.In this review,we focused on the concept of topology and its realization in airborne acoustic crystals,solid elastic phononic crystals,and surface acoustic wave systems.We also introduced emerging concepts of non-Hermitian,higher-order,and Floquet topological insulators in acoustics.It has been shown that the topology theory has such a powerful generality that among the disciplines from electron to photon and phonon,from electronic to photonics and acoustics,from acoustic topological theory to acoustic devices,could interact and be analogous to fertilize fantastic new ideas and prototype devices,which might find applications in acoustic engineering and noisevibration control engineering in the near future.

Resin Matrix Shear Band and Its Special Effect on Stress Concentration of Fiber Composites

A constitutive model is constructed to consider the resin matrix post-yield softening and progressive hardening behaviors. A user-defined material mechanical behavior(UMAT) subroutine is created, then the non-linear three-dimensional finite element analysis on the tensile processes of multi-fiber composites is conducted. The approximate 45° shear bands emanating from the matrix crack tip are found, being coincided with the experimental observations. The shear stress on the adjacent intact fiber/matrix interface is strongly influenced by the shear band and thus the stress concentration factor(SCF) changes obviously in the adjacent fibers. The distinct stress redistribution in the adjacent intact fibers implies the significant effect of the shear bands on the progressive fiber fracture initiation. As the inter-fiber spacing increases, the peak value of the SCF in the adjacent intact fiber decreases, whereas the overload zone becomes wider. The research has provided a helpful tool to evaluate the failure of fiber composites and optimize the composite performance through the proper selection of resin matrix properties and fiber volume fraction.