Limited by the sluggish kinetics at the cathode of proton exchange membrane fuel cells(PEMFCs),optimizing platinum-based alloy catalysts for oxygen reduction reaction remains a key target toward industrialization.Stra...Limited by the sluggish kinetics at the cathode of proton exchange membrane fuel cells(PEMFCs),optimizing platinum-based alloy catalysts for oxygen reduction reaction remains a key target toward industrialization.Strain engineering is widely employed to tune Pt-M catalysts,but its impact on the structure-property relationship is often interwoven with multiple factors.In this work,we propose a bi-stage strain tuning method and demonstrate it on the most common PtCo catalysts.Macro-strain is introduced by synthesizing single-crystal PtCo nanodendrites,whereas mild acid etching introduces micro-strain to the surface.The half-wave potential of as-treated catalysts reaches 0.959 V,and mass activity is up to 0.69 A mg^(−1)_(Pt).A minimal decrease of 2 mV is observed for half-wave potential after 10,000 cycles.Detailed analysis using advanced transmission electron microscopy,wide-angle X-ray scattering,etc.provides direct evidence that surface disorder at the atomic scale accounts for the enhanced activity and stability.In contrast,the simplicity of this approach allows for scaling up on Pt-M catalysts,as demonstrated on PEMFCs.The bi-stage strain tuning strategy provides a new perspective and reference for improving the activity and durability of Pt-M catalysts.展开更多
Organic-inorganic hybrid perovskite solar cells achieve remarkable efficiencies(>26%)yet face stability challenges.Quasi-2D alternating-cation-interlayer perovskites offer enhanced stability through hydrophobic spa...Organic-inorganic hybrid perovskite solar cells achieve remarkable efficiencies(>26%)yet face stability challenges.Quasi-2D alternating-cation-interlayer perovskites offer enhanced stability through hydrophobic spacer cations but suffer from vertical phase segregation and buried interface defects.Herein,we introduce dicyanodiamide(DCD)to simultaneously address these dual limitations in GA(MA)_(n)Pb_(n)I_(3n+1)perovskites.The guanidine group in DCD passivates undercoordinated Pb^(2+)and MA^(+)vacancies at the perovskite/TiO_(2)interface,while cyano groups eliminate oxygen vacancies in TiO_(2)via Ti^(4+)-CN coordination,reducing interfacial trap density by 73%with respect to the control sample.In addition,DCD regulates crystallization kinetics,suppressing low-n-phase aggregation and promoting vertical alignment of high-n phases,which benefit for carrier transport.This dual-functional modification enhances charge transport and stabilizes energy-level alignment.The optimized devices achieve a record power conversion efficiency of 21.54%(vs.19.05%control)and retain 94%initial efficiency after 1200 h,outperforming unmodified counterparts(84%retention).Combining defect passivation with phase homogenization,this work establishes a molecular bridge strategy to decouple stability-efficiency trade-offs in low-dimensional perovskites,providing a universal framework for interface engineering in high-performance optoelectronics.展开更多
Background:A growing body of research is exploring the role of antioxidant and anti-inflammatory dietary supplements in the treatment of osteoarthritis,highlighting an increasing emphasis on nonpharmacological interve...Background:A growing body of research is exploring the role of antioxidant and anti-inflammatory dietary supplements in the treatment of osteoarthritis,highlighting an increasing emphasis on nonpharmacological interventions.Although more patients are turning to supplements to manage osteoarthritis,their actual effectiveness remains uncertain.Objective:This study aims to provide a comprehensive evaluation of the available evidence concerning the efficacy of various dietary supplements in osteoarthritis treatment.Search strategy:We searched PubMed,Embase,Cochrane Library and Web of Science for studies on the use of various dietary supplements in the treatment of osteoarthritis from the creation of each database until Jan 20,2025.Inclusion criteria:(1)Research object:osteoarthritis.(2)Intervention measures:patients in the treatment group received dietary supplements,while the control group received placebos.(3)Research type:randomized controlled trials(RCTs).Data extraction and analysis:Two researchers independently examined the literature and retrieved data based on predefined criteria.The information gathered included the first author,year of publication,sample size,participant demographics,length of the follow-up period,intervention and control measures,and inclusion indications.RCTs comparing dietary supplements to placebo with the pain and function subscales of the Western Ontario and McMaster Universities Osteoarthritis Index(WOMAC)among patients with osteoarthritis were included.The optimal dietary supplement was identified based on the total ranking by summing the surface under the cumulative ranking curve(SUCRA)of these two scores.Furthermore,the Grading of Recommendations Assessment,Development,and Evaluation(GRADE)was used to confirm the quality of the evidence.Results:Overall,23 studies covering 21 dietary supplements and involving 2455 participants met the inclusion criteria.In the WOMAC pain score,the SUCRA of passion fruit peel extract was 91%(mean difference[MD]:–9.2;95%confidence interval[CI]:[–16.0,–2.3]),followed by methylsulfonylmethane(89%),undenatured type II collagen(87%),collagen(84%),and Lanconone(82%).The SUCRA(99%)of passion fruit peel extract(MD:–41.0;95%CI:[–66.0,–16.0])ranked first in terms of the WOMAC function score,followed by Lanconone(95%),collagen(86%),ParActin(84%),and Lactobacillus casei strain Shirota(83%).The top three total rankings are passion fruit peel extract(95.0%),Lanconone(88.5%),and collagen(85.0%).However,the GRADE revealed low evidence quality.Conclusion:Passion fruit peel extract was the best supplement for improving WOMAC pain and function scores in patients with osteoarthritis,followed by Lanconone and collagen.However,further large-scale,well designed RCTs are required to substantiate these promising findings.展开更多
Objective:To determine whether adjuvant chemotherapy improves the prognoses in women with stage IC1 epithelial ovarian cancer(EOC).Methods:All eligible women diagnosed with stage IC1 EOC from 2003 to 2019 in Tongji Ho...Objective:To determine whether adjuvant chemotherapy improves the prognoses in women with stage IC1 epithelial ovarian cancer(EOC).Methods:All eligible women diagnosed with stage IC1 EOC from 2003 to 2019 in Tongji Hospital were included.Patient characteristics,tumor features,surgical types,and chemotherapeutic treatments were collected.Kaplan-Meier analysis and Cox regression analysis were performed to evaluate progression-free survival(PFS)and overall survival(OS).展开更多
基金the National Natural Science Foundation of China(NO.12274010,12474003)Beijing Nova Program(20240484584)+2 种基金the support from the Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments,China(No.22dz2260800)the Shanghai Science and Technology Committee,China(No.22JC1410300)the National Natural Science Foundation of China(No.52103330)。
文摘Limited by the sluggish kinetics at the cathode of proton exchange membrane fuel cells(PEMFCs),optimizing platinum-based alloy catalysts for oxygen reduction reaction remains a key target toward industrialization.Strain engineering is widely employed to tune Pt-M catalysts,but its impact on the structure-property relationship is often interwoven with multiple factors.In this work,we propose a bi-stage strain tuning method and demonstrate it on the most common PtCo catalysts.Macro-strain is introduced by synthesizing single-crystal PtCo nanodendrites,whereas mild acid etching introduces micro-strain to the surface.The half-wave potential of as-treated catalysts reaches 0.959 V,and mass activity is up to 0.69 A mg^(−1)_(Pt).A minimal decrease of 2 mV is observed for half-wave potential after 10,000 cycles.Detailed analysis using advanced transmission electron microscopy,wide-angle X-ray scattering,etc.provides direct evidence that surface disorder at the atomic scale accounts for the enhanced activity and stability.In contrast,the simplicity of this approach allows for scaling up on Pt-M catalysts,as demonstrated on PEMFCs.The bi-stage strain tuning strategy provides a new perspective and reference for improving the activity and durability of Pt-M catalysts.
基金support from the National Key R&D Program of China(Grant No.2023YFE0111500)the National Natural Science Foundation of China(Grant No.52321006,T2394480,T2394484,22109143,22479131)+8 种基金Beijing National Laboratory for Molecular Sciences(BNLMS-CXXM-202005)the China Postdoctoral Innovative Talent Support Program(Grant No.BX2021271)the China Postdoctoral Science Foundation(2022M712851)the Opening Project of State Key Laboratory of Advanced Technology for Float Glass(Grant No.2022KF04)Graduate Education Reform Project of Henan Province(Grant No.2023SJGLX136Y)Key R&D Special Program of Henan Province(Grant No.241111242000)Program for Science and Technology Innovation Talents in Universities of Henan Province(Grant No.25HASTIT005)Training Plan for Young Backbone Teachers of Zhengzhou University(Grant No.2023ZDGGJS017)the Joint Research Project of Puyang Shengtong Juyuan New Materials Co.,Ltd.(Grant No.20230128A).
文摘Organic-inorganic hybrid perovskite solar cells achieve remarkable efficiencies(>26%)yet face stability challenges.Quasi-2D alternating-cation-interlayer perovskites offer enhanced stability through hydrophobic spacer cations but suffer from vertical phase segregation and buried interface defects.Herein,we introduce dicyanodiamide(DCD)to simultaneously address these dual limitations in GA(MA)_(n)Pb_(n)I_(3n+1)perovskites.The guanidine group in DCD passivates undercoordinated Pb^(2+)and MA^(+)vacancies at the perovskite/TiO_(2)interface,while cyano groups eliminate oxygen vacancies in TiO_(2)via Ti^(4+)-CN coordination,reducing interfacial trap density by 73%with respect to the control sample.In addition,DCD regulates crystallization kinetics,suppressing low-n-phase aggregation and promoting vertical alignment of high-n phases,which benefit for carrier transport.This dual-functional modification enhances charge transport and stabilizes energy-level alignment.The optimized devices achieve a record power conversion efficiency of 21.54%(vs.19.05%control)and retain 94%initial efficiency after 1200 h,outperforming unmodified counterparts(84%retention).Combining defect passivation with phase homogenization,this work establishes a molecular bridge strategy to decouple stability-efficiency trade-offs in low-dimensional perovskites,providing a universal framework for interface engineering in high-performance optoelectronics.
基金supported by the Association Foundation Program of the Yunnan Provincial Science and Technology Department and Kunming Medical University(No.202401AY070001-176 and 202401AY070001-180)the Xing Dian Talent Support Plan(to ZC),the Yunnan Province “the 14th Five-Year Plan”Provincial Key Clinical Specialty Construction Project(Traumatology Surgery)the Yunnan University Medical Research Foundation(No.YDYXJJ2024-0029,YDYXJJ2024-0040 and YDYXJJ2024-0017)。
文摘Background:A growing body of research is exploring the role of antioxidant and anti-inflammatory dietary supplements in the treatment of osteoarthritis,highlighting an increasing emphasis on nonpharmacological interventions.Although more patients are turning to supplements to manage osteoarthritis,their actual effectiveness remains uncertain.Objective:This study aims to provide a comprehensive evaluation of the available evidence concerning the efficacy of various dietary supplements in osteoarthritis treatment.Search strategy:We searched PubMed,Embase,Cochrane Library and Web of Science for studies on the use of various dietary supplements in the treatment of osteoarthritis from the creation of each database until Jan 20,2025.Inclusion criteria:(1)Research object:osteoarthritis.(2)Intervention measures:patients in the treatment group received dietary supplements,while the control group received placebos.(3)Research type:randomized controlled trials(RCTs).Data extraction and analysis:Two researchers independently examined the literature and retrieved data based on predefined criteria.The information gathered included the first author,year of publication,sample size,participant demographics,length of the follow-up period,intervention and control measures,and inclusion indications.RCTs comparing dietary supplements to placebo with the pain and function subscales of the Western Ontario and McMaster Universities Osteoarthritis Index(WOMAC)among patients with osteoarthritis were included.The optimal dietary supplement was identified based on the total ranking by summing the surface under the cumulative ranking curve(SUCRA)of these two scores.Furthermore,the Grading of Recommendations Assessment,Development,and Evaluation(GRADE)was used to confirm the quality of the evidence.Results:Overall,23 studies covering 21 dietary supplements and involving 2455 participants met the inclusion criteria.In the WOMAC pain score,the SUCRA of passion fruit peel extract was 91%(mean difference[MD]:–9.2;95%confidence interval[CI]:[–16.0,–2.3]),followed by methylsulfonylmethane(89%),undenatured type II collagen(87%),collagen(84%),and Lanconone(82%).The SUCRA(99%)of passion fruit peel extract(MD:–41.0;95%CI:[–66.0,–16.0])ranked first in terms of the WOMAC function score,followed by Lanconone(95%),collagen(86%),ParActin(84%),and Lactobacillus casei strain Shirota(83%).The top three total rankings are passion fruit peel extract(95.0%),Lanconone(88.5%),and collagen(85.0%).However,the GRADE revealed low evidence quality.Conclusion:Passion fruit peel extract was the best supplement for improving WOMAC pain and function scores in patients with osteoarthritis,followed by Lanconone and collagen.However,further large-scale,well designed RCTs are required to substantiate these promising findings.
基金supported by the International Research Center of Big Data for Sustainable Development Goals [grant number CBAS2022GSP01]the National Natural Science Foundation of China [grant numbers 42276203 and 42030406]+1 种基金the Natural Science Foundation of Shandong Province [grant number ZR2021MD001]the Laoshan Laboratory [grant number LSKJ202204302].
基金This study was supported by grants from the National Key Technology R&D Program of China(No.2019YFC1005200,No.2019YFC1005202 and2018YFC1002103)。
文摘Objective:To determine whether adjuvant chemotherapy improves the prognoses in women with stage IC1 epithelial ovarian cancer(EOC).Methods:All eligible women diagnosed with stage IC1 EOC from 2003 to 2019 in Tongji Hospital were included.Patient characteristics,tumor features,surgical types,and chemotherapeutic treatments were collected.Kaplan-Meier analysis and Cox regression analysis were performed to evaluate progression-free survival(PFS)and overall survival(OS).
