Available online Alkaline water electrolysis(AWE)is a prominent technique for obtaining a sustainable hydrogen source and effectively managing the energy infrastructure.Noble metal-based electrocatalysts,owing to thei...Available online Alkaline water electrolysis(AWE)is a prominent technique for obtaining a sustainable hydrogen source and effectively managing the energy infrastructure.Noble metal-based electrocatalysts,owing to their exceptional hydrogen binding energy,exhibit remarkable catalytic activity and long-term stability in the hydrogen evolution reaction(HER).However,the restricted accessibility and exorbitant cost of noble-metal materials pose obstacles to their extensive adoption in industrial contexts.This review investigates strategies aimed at reducing the dependence on noble-metal electrocatalysts and developing a cost-effective alkaline HER catalyst,while considering the principles of sustainable development.The initial discussion covers the fundamental principle of HER,followed by an overview of prevalent techniques for synthesizing catalysts based on noble metals,along with a thorough examination of recent advancements.The subsequent discussion focuses on the strategies employed to improve noble metalbased catalysts,including enhancing the intrinsic activity at active sites and increasing the quantity of active sites.Ultimately,this investigation concludes by examining the present state and future direction of research in the field of electrocatalysis for the HER.展开更多
Corrosion protection of the hull steel by the conventional epoxy paint containing a small amount of commercial poly（3,4-ethylenedioxythiophene）/poly（styrene sulfonate） （PEDOT/PSS）, which is one of the most popul...Corrosion protection of the hull steel by the conventional epoxy paint containing a small amount of commercial poly（3,4-ethylenedioxythiophene）/poly（styrene sulfonate） （PEDOT/PSS）, which is one of the most popular and successful inherently conducting polymers as the corrosion inhibitor was studied. The corrosion behavior of the samples was investigated in seawater by electrochemical impedance spectroscopy and open circuit potential. Scanning electron microscopy was used to observe the surface morphology of the samples after corrosion. It was found that adding a small amount of PEDOT/PSS to the epoxy resin can significantly improve its corrosion protection.展开更多
In this work,an enriched model describing the longitudinal wave propagation is established based on Mindlin’s Second Strain Gradient(SSG)theory,which can describe the heterogeneity caused by the micro-structure inter...In this work,an enriched model describing the longitudinal wave propagation is established based on Mindlin’s Second Strain Gradient(SSG)theory,which can describe the heterogeneity caused by the micro-structure interactions in the frame of continuum mechanics.The governing equation and associated boundary conditions are derived based on Hamilton’s principle,then the dispersion relation of non-classical longitudinal wave together with the extra-waves appearing exclusively in SSG theory model are investigated.The investigations are based on the modal density,energy flow,and forced response of the rod.Wave transmission and reflection through planar interfaces based on the proposed model have been calculated.Finally,the results of the enriched model are well interpreted by comparing with the classical theory results,and some useful conclusions are derived on the SSG theory based model in the wave propagation characterization.展开更多
In this work, a novel flower-like cobalt-based metal organic frameworks(MOFs) self-assembled by Co^(2+) and nicotinic acid have been designed and synthesized. After a simple annealing treatment, Co_3O_4 nanoparticles ...In this work, a novel flower-like cobalt-based metal organic frameworks(MOFs) self-assembled by Co^(2+) and nicotinic acid have been designed and synthesized. After a simple annealing treatment, Co_3O_4 nanoparticles in-situ decorating on nitrogen doped graphite carbon-sheet(Co_3O_4/NC) were obtained. The resultant Co_3O_4/NC hybrid with unique flower-like structure and ration combination of Co_3O_4 nanoparticles and nitrogen doped graphite carbon, endowing the hybrid with enhanced electrical conductivity,short ion diffusion pathways and rich porosity to the materials, which can largely alleviate the problems of Co_3O_4 such as inferior intrinsic electrical conductivity, sluggish ion kinetics and large volume change upon cycling. When evaluated as anode material for sodium-ion batteries(SIBs), the Co_3O_4/NC hybrid exhibits satisfied reversible capacity(213.9 mAh g^(-1) after 100 cycles at 0.1 A g^(-1) ), excellent rate capability(145.4 m Ah g^(-1) at 2 A g^(-1) and 130.1 mAh g^(-1) at 4 A g^(-1) ) and robust long-term cycling stability(120.1 m Ah g^(-1) after 2000 cycles at 0.5 A g^(-1) ), showing great potential for high-performance SIBs.展开更多
Largescale vaporsolid synthesis of ultralong silicon nitride （Si3N4） nanowires was achieved by using simple thermal evaporation of mixture powders of active carbon and monoxide silicon. The products were charac teri...Largescale vaporsolid synthesis of ultralong silicon nitride （Si3N4） nanowires was achieved by using simple thermal evaporation of mixture powders of active carbon and monoxide silicon. The products were charac terized by Xray diffraction, scanning electron microscopy, energydispersive Xray spectroscopy, and transmission electron microscopy. The results suggest that the silicon nitride nanowires have a smooth surface, with lengths of up to several hundreds of microns and diameters of 100300 nm. A detailed study of both the chemical and structural composition was performed. Such ultralong sil icon nitride nanowires demonstrate potential applications as materials for constructing nanoscale devices and as reinforcement in advanced composites.展开更多
BACKGROUND Cesarean scar pregnancy(CSP)is rare but may result in uterine rupture during pregnancy or massive hemorrhage during abortion procedures.Awareness of this condition is increasing,and most patients with CSP a...BACKGROUND Cesarean scar pregnancy(CSP)is rare but may result in uterine rupture during pregnancy or massive hemorrhage during abortion procedures.Awareness of this condition is increasing,and most patients with CSP are now diagnosed early and can be managed safely.However,some atypical patients are misdiagnosed,and their surgical risks are underestimated,increasing the risk of fatal hemorrhage.CASE SUMMARY A 27-year-old Asian woman visited our institution because of abnormal pregnancy,and she was diagnosed with a hydatidiform mole through transvaginal ultrasound(TVS).Under hysteroscopy,a large amount of placental tissue was found in the scar of the lower uterine segment,and a sudden massive hemorrhage occurred during the removal process.The bilateral internal iliac arteries were temporarily blocked under laparoscopy,and scar resection and repair were rapidly performed.She was discharged in good condition 5 d after the operation.CONCLUSION Although TVS is widely used in the diagnosis of CSP,delays in the diagnosis of atypical CSP remain.Surgical treatment following internal iliac artery temporary occlusion may be an appropriate management method for unanticipated massive hemorrhage during CSP surgery.展开更多
Conversion of natural environments to human-modified landscapes is continuing at an unprecedented rate,exerting fundamental influences on global biodiversity.Understanding how wildlife communities respond to landscape...Conversion of natural environments to human-modified landscapes is continuing at an unprecedented rate,exerting fundamental influences on global biodiversity.Understanding how wildlife communities respond to landscape modifications is critical to improve biodiversity conservation in human-dominated landscapes.In this study,we surveyed bird communities in three common habitats(i.e.,farmland,village,and forest)in the southern Anhui Mountainous Area during summer(August 2019)and winter(December 2020).The diversity metrics and species compositions of the avian communities were compared among the habitats,and the effects of land use composition in these habitats were tested.During the field surveys,we recorded 7599 birds of 120 species along 45 line transects of 1km in length.The land use compositions differed among habitats,and land use diversity was the highest in villages and lowest in forests.The species richness and bird abundance in the two human-dominated habitats(i.e.,farmland and village)were higher than those in forest in both seasons.Bird species composition also differed across habitat types in both seasons.Bird species feeding on vertebrates,fish and carrion,and species feeding on plants and seeds were mainly found in habitats with less construction lands and lower land use diversity,while omnivorous species and species feeding on fruits and nectar or on invertebrates were less affected by these two variables.The indicator species analysis showed that most species associated with forest feed on invertebrates,while species feeding on plants and seeds were more correlated with farmland and village.The results indicated that the conversion of natural habitats to human-dominated landscapes has pronounced impacts on bird communities in the study area.Human-dominated habitats harboured more avian species that deserve conservation attention.Meanwhile,bird conservations should not be relaxed in forests because there were more than 20 species that had a high specificity for forests.展开更多
Compared to traditional pure metals or alloys based on just one principal element,high entropy alloys(HEAs)exhibit notable structural and physical characteristics,drawing significant attention.While significant advanc...Compared to traditional pure metals or alloys based on just one principal element,high entropy alloys(HEAs)exhibit notable structural and physical characteristics,drawing significant attention.While significant advancements have been made in the synthesis and utilization of HEAs,there is a lack of comprehensive understanding and systematic approach towards the rational design of electrocatalysts.This review begins by introducing the fundamental principles and impacts of HEAs,followed by an overview of traditional and emerging synthesis techniques;in particular,we categorize and critically analyze approaches.Subsequently,a detailed examination of the advancements and comparative performance of HEAs in specific electrocatalytic reactions is presented.The paper concludes by outlining the current challenges and opportunities associated with HEAs catalysts,along with offering personal insights on potential future developments.展开更多
The polycrystalline samples La_(0.67-x)Nd_(x)Sr_(0.33)MnO_(3)(x=0.1,0.2,0.3,0.4,0.5)were prepared by standard solid-state reaction method,and the M–T curves,electron spin resonance(ESR)curves,infrared spectra,Raman s...The polycrystalline samples La_(0.67-x)Nd_(x)Sr_(0.33)MnO_(3)(x=0.1,0.2,0.3,0.4,0.5)were prepared by standard solid-state reaction method,and the M–T curves,electron spin resonance(ESR)curves,infrared spectra,Raman spectra,ρ–T curves and MR–T curves of the compounds above were measured.The results show that single phase can be obtained at different Nd substitution ratios,and with the increase in Nd doping,the magnetic structure of the system transforms from long-range ferro-magnetic order to spin cluster glass state and antiferro-magnetic state;and the phase separation appears in the samples with x=0.3 and 0.4.The transport property exhibits variation with the increase in Nd doping,and the electric behavior of the sample transforms(from metal state to insulator–metal transition,and then insulator state)is accompanied by colossal magnetoresistance(CMR)effect,which can be attributed to the different couplings of sublattices induced by Nd doping and the interface tun-neling effect related to the spin.展开更多
With the emergence of supercapacitors(SCs),the creation of bio-based electrode materials has grown in significance for the advancement of energy storage.However,it is particularly difficult for cathode materials to me...With the emergence of supercapacitors(SCs),the creation of bio-based electrode materials has grown in significance for the advancement of energy storage.However,it is particularly difficult for cathode materials to meet the demands of practical uses due to their low energy density.Herein,MIL-88 was fabricated in situ on the surface of cotton fibers used in cosmetics,followed by creating Fe_(2)N@porous carbon fiber composite(Fe_(2)N@PCF)through heat treatment at various temperatures.Fe_(2)N@PCF-800 demonstrates excellent specific capacitance performance(552 F g^(-1) at 1 A g^(-1)).Meanwhile,The AC//Fe_(2)N@PCF-800 device exhibits the largest energy density of 38 Wh kg^(-1) at 800 W kg^(-1) and a long cycling stability(83.3%capacity retention after 6000 cycles).Our elaborately designed Fe_(2)N@PCF demonstrate multiple advantages:i)the Fe_(2)N@PCF-800 shows abundant mesopores,providing abundant ion-diffusion pathways for mass transport and rich graphite microstructures,improving electrical conductivity for electron transferowning;ii)the rich nitrogen dopants and Fe_(2)N structure within all carbon components increase the capacitance through their pseudocapacitive contribution.These findings highlight the importance of biomass derived carbon materials for SCs applications.展开更多
Purpose: The purpose of this study is to develop an automated frequently asked question(FAQ) answering system for farmers. This paper presents an approach for calculating the similarity between Chinese sentences based...Purpose: The purpose of this study is to develop an automated frequently asked question(FAQ) answering system for farmers. This paper presents an approach for calculating the similarity between Chinese sentences based on hybrid strategies.Design/methodology/approach: We analyzed the factors influencing the successful matching between a user's question and a question-answer(QA) pair in the FAQ database. Our approach is based on a combination of multiple factors. Experiments were conducted to test the performance of our method.Findings: Experiments show that this proposed method has higher accuracy. Compared with similarity calculation based on TF-IDF,the sentence surface forms and the semantic relations,the proposed method based on hybrid strategies has a superior performance in precision,recall and F-measure value.Research limitations: The FAQ answering system is only capable of meeting users' demand for text retrieval at present. In the future,the system needs to be improved to meet users' demand for retrieving images and videos.Practical implications: This FAQ answering system will help farmers utilize agricultural information resources more efficiently.Originality/value: We design the algorithms for calculating similarity of Chinese sentences based on hybrid strategies,which integrate the question surface similarity,the question semantic similarity and the question-answer similarity based on latent semantic analysis(LSA) to find answers to a user's question.展开更多
Objective:To assess the relation between XRCC3 Thr241Met polymorphism and lung cancer susceptibility of populations in East Asia.Methods:Related studies of XRCC3 Thr24lMet polymorphism and lung cancer susceptibility o...Objective:To assess the relation between XRCC3 Thr241Met polymorphism and lung cancer susceptibility of populations in East Asia.Methods:Related studies of XRCC3 Thr24lMet polymorphism and lung cancer susceptibility of populations in East Asia were collected through searching the Pubmed,Embase Library,SPRINGER.CNKI and CSSCI.Results:According to the entry criteria,there were 8 case-control studies in the assessing system and there were 6 321study cases,including 3 215 patients with lung cancer and 3 106 cases without cancers.Meta analysis results showed the combined OR value of the ratio of genotype Thr/Met+Met/Met and Thr/Thr was 1.03(95%CI:0.89-1.20)(P>0.05).Conclusions:XRCC3 Thr241Met polymorphism may not related to lung cancer susceptibility of populations in East Asia.Allele 241Met did not increase the risk of lung cancer.展开更多
Recently,Coordination Polymers(CPs)have been widely utilized as energy storage materials for reversible Lithium-Ion Batteries(LIBs)benefiting from their tunable building blocks and adjusted electrochemical properties....Recently,Coordination Polymers(CPs)have been widely utilized as energy storage materials for reversible Lithium-Ion Batteries(LIBs)benefiting from their tunable building blocks and adjusted electrochemical properties.However,the unsatisfied electrochemical behavior of CPs with poor conductivity and sluggish ion transport kinetics is still a bottle-neck for their large-scale energy storage applications in LIBs.Herein,we display the rational fabrication of a conductive Sn-based coordination polymer(Sn-DHTPA)via judiciously choosing suitable building units.The Sn-DHTPA is employed as anode for LIBs,exhibiting superior reversible storage capacity of 1142.6 m A h g^(-1) at 0.1 A g^(-1) after 100 cycles and impressive rate storage capability of 287.7 m A h g^(-1)at 20 A g^(-1).More importantly,a robust cycling performance of 205.5 m A h g^(-1) at an extra-high current density of 20 A g^(-1) are observed without remarkable capacity-fading up to1000 cycles.The behavior superiority of Sn-DHTPA is related to its advanced architecture with abundant lithium storage sites,high electrical conductivity and rapid lithium transport.A series of ex-situ characterizations reveal that the impressive lithium storage capacity is contributed by the redox active sites of both the aromatic linker and metal center related to in-situ generated metallic nanoparticles dispersed in the skeleton.展开更多
The abnormal expansion of G-rich hexanucleotide repeat,GGGGCC(G4C2),in chromosome 9 open reading frame 72(C9orf72)is known to be the prevailing genetic cause of two fatal degenerative neurological diseases,amyotrophic...The abnormal expansion of G-rich hexanucleotide repeat,GGGGCC(G4C2),in chromosome 9 open reading frame 72(C9orf72)is known to be the prevailing genetic cause of two fatal degenerative neurological diseases,amyotrophic lateral sclerosis(ALS)and frontotemporal dementia(FTD).It is well known that the DNA G4C2 repeat expansion with different lengths can form G-quadruplexes which affect gene transcription related to ALS/FTD,therefore it is crucial to understand DNA G4C2 G-quadruplex structures.Herein,by utilizing nuclear magnetic resonance(NMR)spectroscopy,we examined DNA G-quadruplex structure adopted by two G4C2 hexanucleotide repeats with an inosine substitution at position 4,d(G4C2)2-I4.We show that d(G4C2)2-I4 folds into an eight-layer parallel tetrameric G-quadruplex containing two parallel dimeric G-quadruplexes stacking together through p-p interaction via 50-to-50 mode in solution.Each dimeric G-quadruplex unit involves two propeller loops composed of two cytosine bases.This result is consistent with the observation in the crystal structure of d(G4C2)2.Our work not only sheds light on the structural diversity of G-quadruplexes adopted by d(G4C2)n but also provides a structural basis for drug design in treatment of ALS and FTD.展开更多
Purpose: Focusing on a comparative analysis of information visualization in library and information science(LIS) from the perspective of research subject and intellectual base, this paper aims to discover the differen...Purpose: Focusing on a comparative analysis of information visualization in library and information science(LIS) from the perspective of research subject and intellectual base, this paper aims to discover the difference and coherence between Chinese domestic studies on information visualization and those of other areas of the world so as to show their theoretical foundation and development trend in a more objective way.Design/methodology/approach: By using the social network analysis tool Ucinet, we have first constructed networks of key author collaboration for 651 articles retrieved from the Chinese Social Sciences Citation Index(CSSCI) and 910 from the Web of Science(WoS),which were published on information visualization between 1998 and 2012 in library and information science, then we compared the intellectual base by mapping analysis from perspective of half-life, centrality and burst detection with CiteSpace II.Findings: Up to date, 51 countries and regions have contributed to the research of information visualization, and in total, we found 9 research clusters of author co-occurrence matrices,among which three are in China. Within Chinese co-author networks, most Chinese scholars have come from the same research institutions, that is to say, more international cooperation and exchange are still required for the research of information visualization across different disciplines and regions.Research limitations: This co-author network and co-citation analysis is mainly based on the research field of LIS with a focus of the WoS and CSSCI databases only, further samples are required for more generalized results to increase our understanding on the development trend of information visualization.Practical implications: This study could lead to a better understanding of the applications of information visualization technologies in discovering the development trend of a research field. Originality/value: To the best of our knowledge, this is the first comparative analysis of research subject and intellectual base on information visualization, specifically, from the perspective of contributions of Chinese scholars in this regard. By dividing most frequently cited Chinese literature into two categories(original and non-original research papers), this paper shows the extent of contributions that Chinese domestic scholars have made to the research of information visualization, by revealing the contributions of different types of Chinese domestic papers on information visualization.展开更多
Artificial Intelligence(AI)has increased as a potent tool in medicine,with promising oncology applications.The emergence of immunotherapy has transformed the treatment terrain for hepatocellular carcinoma(HCC),offerin...Artificial Intelligence(AI)has increased as a potent tool in medicine,with promising oncology applications.The emergence of immunotherapy has transformed the treatment terrain for hepatocellular carcinoma(HCC),offering new hope to patients with this challenging malignancy.This article examines the role and future of AI in forecasting the effectiveness of immunotherapy in HCC.We highlight the potential of AI to revolutionize the prediction of therapy response,thus improving patient selection and clinical outcomes.The article further outlines the challenges and future research directions in this emerging field.展开更多
The Kulun region is located in the eastern Bainaimiao arc belt on the southeastern margin of the Central Asian Orogenic Belt(CAOB),adjacent to the North China Craton(NCC)to the south.This region records the closure of...The Kulun region is located in the eastern Bainaimiao arc belt on the southeastern margin of the Central Asian Orogenic Belt(CAOB),adjacent to the North China Craton(NCC)to the south.This region records the closure of the PaleoAsian Ocean during the Paleozoic to early Mesozoic and is key to study the tectonic evolution of the northern margin of the NCC.We conducted zircon U-Pb geochronology and Hf isotope analysis of volcanic-sedimentary and intrusive rocks in the Kulun region.The volcanic-sedimentary rocks were previously assigned an early Carboniferous age,but include volcanic rocks with ages of 267–266 Ma and sedimentary rocks with youngest detrital zircon age peaks of 265–244 Ma,which were intruded by a granite with an age of 242 Ma.This indicates that these rocks are actually middle Permian to Middle Triassic in age(267–242Ma)and correspond to the Qingfengshan and Liujiagou formations.Moreover,two volcanic rock samples have highεHf(t)values(+1.6 to+16.1)and relatively young two-stage Hf model ages(1095–327 Ma),indicating their sources associated with the CAOB.The age spectra and Hf isotopic characteristics of detrital zircons from the sedimentary rocks suggest that,during the middle Permian to Middle Triassic,the sedimentary provenance in the Kulun region was mainly the CAOB.However,by the Early Jurassic,the provenance changed to the NCC(i.e.,the Inner Mongolia Paleo-uplift,IMPU).This result,combined with the development of a series of conglomerates on the northern margin of the NCC in the Late Triassic(i.e.,Xingshikou,Xiaoyingzi,and Xiaohekou formations),indicates the Kulun region experienced an abrupt change in paleogeography during the Late Triassic,with the IMPU undergoing significant uplift and thus becoming the main sediment source in the Kulun region.Based on the Late Triassic alkaline igneous belt(235–215 Ma)in the IMPU,we speculate that this uplift was caused by detachment of the southward-subducting Paleo-Asian oceanic plate,which occurred in a post-orogenic extensional setting.The boundary between the NCC and CAOB(i.e.,the Bainaimiao arc belt)in the Kulun region is defined by the newly identified Paleoproterozoic granites(1.8 and 1.6 Ga)and our zircon geochronology and Hf isotope data.展开更多
基金financial support by the National Natural Science Foundation of China(No.52102241)Doctor of Suzhou University Scientific Research Foundation(Nos.2022BSK019,2020BS015)+2 种基金the Primary Research and Development Program of Anhui Province(No.201904a05020087)the Natural Science Research Project in Universities of Anhui Province in China(Nos.2022AH051386,KJ2021A1114)the Foundation(No.GZKF202211)of State Key Laboratory of Biobased Material and Green Papermaking Qilu University of Technology。
文摘Available online Alkaline water electrolysis(AWE)is a prominent technique for obtaining a sustainable hydrogen source and effectively managing the energy infrastructure.Noble metal-based electrocatalysts,owing to their exceptional hydrogen binding energy,exhibit remarkable catalytic activity and long-term stability in the hydrogen evolution reaction(HER).However,the restricted accessibility and exorbitant cost of noble-metal materials pose obstacles to their extensive adoption in industrial contexts.This review investigates strategies aimed at reducing the dependence on noble-metal electrocatalysts and developing a cost-effective alkaline HER catalyst,while considering the principles of sustainable development.The initial discussion covers the fundamental principle of HER,followed by an overview of prevalent techniques for synthesizing catalysts based on noble metals,along with a thorough examination of recent advancements.The subsequent discussion focuses on the strategies employed to improve noble metalbased catalysts,including enhancing the intrinsic activity at active sites and increasing the quantity of active sites.Ultimately,this investigation concludes by examining the present state and future direction of research in the field of electrocatalysis for the HER.
基金the financial support from the National Natural Science Foundation of China(Nos.50963002 and 51073074)
文摘Corrosion protection of the hull steel by the conventional epoxy paint containing a small amount of commercial poly（3,4-ethylenedioxythiophene）/poly（styrene sulfonate） （PEDOT/PSS）, which is one of the most popular and successful inherently conducting polymers as the corrosion inhibitor was studied. The corrosion behavior of the samples was investigated in seawater by electrochemical impedance spectroscopy and open circuit potential. Scanning electron microscopy was used to observe the surface morphology of the samples after corrosion. It was found that adding a small amount of PEDOT/PSS to the epoxy resin can significantly improve its corrosion protection.
基金supported by the LabEx CeLyA (Centre Lyonnais d’Acoustique, ANR-10-LABX-0060) of Universitéde Lyon。
文摘In this work,an enriched model describing the longitudinal wave propagation is established based on Mindlin’s Second Strain Gradient(SSG)theory,which can describe the heterogeneity caused by the micro-structure interactions in the frame of continuum mechanics.The governing equation and associated boundary conditions are derived based on Hamilton’s principle,then the dispersion relation of non-classical longitudinal wave together with the extra-waves appearing exclusively in SSG theory model are investigated.The investigations are based on the modal density,energy flow,and forced response of the rod.Wave transmission and reflection through planar interfaces based on the proposed model have been calculated.Finally,the results of the enriched model are well interpreted by comparing with the classical theory results,and some useful conclusions are derived on the SSG theory based model in the wave propagation characterization.
基金supported financially by the Anhui Provincial Key Research and Development Program(No.1704A0902022)the College Natural Science Key Foundation of Anhui Province(No.KJ2018A0453)+2 种基金the Innovative Research Team of Anhui Provincial Education Department(No.2016SCXPTTD)the Key Discipline of Material Science and Engineering of Suzhou University(No.2017XJZDXK3)the Key Scientific Research Projects of Suzhou University(No.2016yzd02)
文摘In this work, a novel flower-like cobalt-based metal organic frameworks(MOFs) self-assembled by Co^(2+) and nicotinic acid have been designed and synthesized. After a simple annealing treatment, Co_3O_4 nanoparticles in-situ decorating on nitrogen doped graphite carbon-sheet(Co_3O_4/NC) were obtained. The resultant Co_3O_4/NC hybrid with unique flower-like structure and ration combination of Co_3O_4 nanoparticles and nitrogen doped graphite carbon, endowing the hybrid with enhanced electrical conductivity,short ion diffusion pathways and rich porosity to the materials, which can largely alleviate the problems of Co_3O_4 such as inferior intrinsic electrical conductivity, sluggish ion kinetics and large volume change upon cycling. When evaluated as anode material for sodium-ion batteries(SIBs), the Co_3O_4/NC hybrid exhibits satisfied reversible capacity(213.9 mAh g^(-1) after 100 cycles at 0.1 A g^(-1) ), excellent rate capability(145.4 m Ah g^(-1) at 2 A g^(-1) and 130.1 mAh g^(-1) at 4 A g^(-1) ) and robust long-term cycling stability(120.1 m Ah g^(-1) after 2000 cycles at 0.5 A g^(-1) ), showing great potential for high-performance SIBs.
基金supported by the Key Program of the National Natural Science Foundation of China(No.19934003)the Grand Program of Natural Science Research of Anhui Education Department(No.ZD2007003-1)+1 种基金the Natural Science Research Program of Universities and Colleges of Anhui Province(No.KJ2008A19ZC)the Opening Program of Cultivating Baseof Anhui Key Laboratory of Spintronics and Nano-materials(No.2012YKF10)
文摘Largescale vaporsolid synthesis of ultralong silicon nitride （Si3N4） nanowires was achieved by using simple thermal evaporation of mixture powders of active carbon and monoxide silicon. The products were charac terized by Xray diffraction, scanning electron microscopy, energydispersive Xray spectroscopy, and transmission electron microscopy. The results suggest that the silicon nitride nanowires have a smooth surface, with lengths of up to several hundreds of microns and diameters of 100300 nm. A detailed study of both the chemical and structural composition was performed. Such ultralong sil icon nitride nanowires demonstrate potential applications as materials for constructing nanoscale devices and as reinforcement in advanced composites.
基金Supported by Medical Health Science and Technology Project of Zhejiang Province,China,No.2020ZH003。
文摘BACKGROUND Cesarean scar pregnancy(CSP)is rare but may result in uterine rupture during pregnancy or massive hemorrhage during abortion procedures.Awareness of this condition is increasing,and most patients with CSP are now diagnosed early and can be managed safely.However,some atypical patients are misdiagnosed,and their surgical risks are underestimated,increasing the risk of fatal hemorrhage.CASE SUMMARY A 27-year-old Asian woman visited our institution because of abnormal pregnancy,and she was diagnosed with a hydatidiform mole through transvaginal ultrasound(TVS).Under hysteroscopy,a large amount of placental tissue was found in the scar of the lower uterine segment,and a sudden massive hemorrhage occurred during the removal process.The bilateral internal iliac arteries were temporarily blocked under laparoscopy,and scar resection and repair were rapidly performed.She was discharged in good condition 5 d after the operation.CONCLUSION Although TVS is widely used in the diagnosis of CSP,delays in the diagnosis of atypical CSP remain.Surgical treatment following internal iliac artery temporary occlusion may be an appropriate management method for unanticipated massive hemorrhage during CSP surgery.
基金supported by the National Natural Science Foundation of China (grant numbers 31970500 and 31770571)the Excellent Youth Project of the Anhui Natural Science Foundation (2108085Y09)the Biodiversity Investigation,Observation and Assessment Program (2019-2023) of Ministry of Ecology and Environment of China
文摘Conversion of natural environments to human-modified landscapes is continuing at an unprecedented rate,exerting fundamental influences on global biodiversity.Understanding how wildlife communities respond to landscape modifications is critical to improve biodiversity conservation in human-dominated landscapes.In this study,we surveyed bird communities in three common habitats(i.e.,farmland,village,and forest)in the southern Anhui Mountainous Area during summer(August 2019)and winter(December 2020).The diversity metrics and species compositions of the avian communities were compared among the habitats,and the effects of land use composition in these habitats were tested.During the field surveys,we recorded 7599 birds of 120 species along 45 line transects of 1km in length.The land use compositions differed among habitats,and land use diversity was the highest in villages and lowest in forests.The species richness and bird abundance in the two human-dominated habitats(i.e.,farmland and village)were higher than those in forest in both seasons.Bird species composition also differed across habitat types in both seasons.Bird species feeding on vertebrates,fish and carrion,and species feeding on plants and seeds were mainly found in habitats with less construction lands and lower land use diversity,while omnivorous species and species feeding on fruits and nectar or on invertebrates were less affected by these two variables.The indicator species analysis showed that most species associated with forest feed on invertebrates,while species feeding on plants and seeds were more correlated with farmland and village.The results indicated that the conversion of natural habitats to human-dominated landscapes has pronounced impacts on bird communities in the study area.Human-dominated habitats harboured more avian species that deserve conservation attention.Meanwhile,bird conservations should not be relaxed in forests because there were more than 20 species that had a high specificity for forests.
基金the financial support by the National Natural Science Foundation of China(52102241)the Primary Research and Development Program of Anhui Province(201904a05020087)the Doctor of Suzhou University Scientific Research Foundation(2022BSK019)。
文摘Compared to traditional pure metals or alloys based on just one principal element,high entropy alloys(HEAs)exhibit notable structural and physical characteristics,drawing significant attention.While significant advancements have been made in the synthesis and utilization of HEAs,there is a lack of comprehensive understanding and systematic approach towards the rational design of electrocatalysts.This review begins by introducing the fundamental principles and impacts of HEAs,followed by an overview of traditional and emerging synthesis techniques;in particular,we categorize and critically analyze approaches.Subsequently,a detailed examination of the advancements and comparative performance of HEAs in specific electrocatalytic reactions is presented.The paper concludes by outlining the current challenges and opportunities associated with HEAs catalysts,along with offering personal insights on potential future developments.
基金the Key Programme of Grand Basic Research Programme of China(No.2007CB925001)the National Key Basic Research Programme of China(No.001CB610604)+1 种基金the Grand Natural Science Research Programme of Anhui Education Department(Nos.ZD2007003-1 and KJ2010A074)the Anhui Provincial Natural Science Foundation(No.1308085MA11)。
文摘The polycrystalline samples La_(0.67-x)Nd_(x)Sr_(0.33)MnO_(3)(x=0.1,0.2,0.3,0.4,0.5)were prepared by standard solid-state reaction method,and the M–T curves,electron spin resonance(ESR)curves,infrared spectra,Raman spectra,ρ–T curves and MR–T curves of the compounds above were measured.The results show that single phase can be obtained at different Nd substitution ratios,and with the increase in Nd doping,the magnetic structure of the system transforms from long-range ferro-magnetic order to spin cluster glass state and antiferro-magnetic state;and the phase separation appears in the samples with x=0.3 and 0.4.The transport property exhibits variation with the increase in Nd doping,and the electric behavior of the sample transforms(from metal state to insulator–metal transition,and then insulator state)is accompanied by colossal magnetoresistance(CMR)effect,which can be attributed to the different couplings of sublattices induced by Nd doping and the interface tun-neling effect related to the spin.
基金financial support by the Foundation(No.GZKF202211)of State Key Laboratory of Biobased Material and Green Papermaking(Qilu University of Technology,Shandong Academy of Sciences)the Doctor of Suzhou University Scientific Research Foundation(2020BS015)+2 种基金Primary Research and Development Program of Anhui Province(201904a05020087)the Natural Science Research in Universities of Anhui Province in China(KJ2017A437,KJ2020A0727,KJ2020A0738 and KJ2020A0730,2022AH051363)the Provincial Natural Science Foundation of Anhui(1908085ME120).
文摘With the emergence of supercapacitors(SCs),the creation of bio-based electrode materials has grown in significance for the advancement of energy storage.However,it is particularly difficult for cathode materials to meet the demands of practical uses due to their low energy density.Herein,MIL-88 was fabricated in situ on the surface of cotton fibers used in cosmetics,followed by creating Fe_(2)N@porous carbon fiber composite(Fe_(2)N@PCF)through heat treatment at various temperatures.Fe_(2)N@PCF-800 demonstrates excellent specific capacitance performance(552 F g^(-1) at 1 A g^(-1)).Meanwhile,The AC//Fe_(2)N@PCF-800 device exhibits the largest energy density of 38 Wh kg^(-1) at 800 W kg^(-1) and a long cycling stability(83.3%capacity retention after 6000 cycles).Our elaborately designed Fe_(2)N@PCF demonstrate multiple advantages:i)the Fe_(2)N@PCF-800 shows abundant mesopores,providing abundant ion-diffusion pathways for mass transport and rich graphite microstructures,improving electrical conductivity for electron transferowning;ii)the rich nitrogen dopants and Fe_(2)N structure within all carbon components increase the capacitance through their pseudocapacitive contribution.These findings highlight the importance of biomass derived carbon materials for SCs applications.
基金jointly supported by the National Social Science Foundation of China(Grant Nos.:08ATQ003 and 10&ZD134)
文摘Purpose: The purpose of this study is to develop an automated frequently asked question(FAQ) answering system for farmers. This paper presents an approach for calculating the similarity between Chinese sentences based on hybrid strategies.Design/methodology/approach: We analyzed the factors influencing the successful matching between a user's question and a question-answer(QA) pair in the FAQ database. Our approach is based on a combination of multiple factors. Experiments were conducted to test the performance of our method.Findings: Experiments show that this proposed method has higher accuracy. Compared with similarity calculation based on TF-IDF,the sentence surface forms and the semantic relations,the proposed method based on hybrid strategies has a superior performance in precision,recall and F-measure value.Research limitations: The FAQ answering system is only capable of meeting users' demand for text retrieval at present. In the future,the system needs to be improved to meet users' demand for retrieving images and videos.Practical implications: This FAQ answering system will help farmers utilize agricultural information resources more efficiently.Originality/value: We design the algorithms for calculating similarity of Chinese sentences based on hybrid strategies,which integrate the question surface similarity,the question semantic similarity and the question-answer similarity based on latent semantic analysis(LSA) to find answers to a user's question.
基金supported by Medicine Science and Technology Research Project of Hebei Province
文摘Objective:To assess the relation between XRCC3 Thr241Met polymorphism and lung cancer susceptibility of populations in East Asia.Methods:Related studies of XRCC3 Thr24lMet polymorphism and lung cancer susceptibility of populations in East Asia were collected through searching the Pubmed,Embase Library,SPRINGER.CNKI and CSSCI.Results:According to the entry criteria,there were 8 case-control studies in the assessing system and there were 6 321study cases,including 3 215 patients with lung cancer and 3 106 cases without cancers.Meta analysis results showed the combined OR value of the ratio of genotype Thr/Met+Met/Met and Thr/Thr was 1.03(95%CI:0.89-1.20)(P>0.05).Conclusions:XRCC3 Thr241Met polymorphism may not related to lung cancer susceptibility of populations in East Asia.Allele 241Met did not increase the risk of lung cancer.
基金financially supported by National Natural Science Foundation of China(51702056)Fundamental Research Funds for the Central Universities(2162140621617330)+2 种基金Science and Technology Program of Guangzhou(202102020737,201605030008)Provincial Natural Science Foundation of Anhui(1908085ME120)Primary Research and Development Program of Anhui Province(201904a05020087)。
文摘Recently,Coordination Polymers(CPs)have been widely utilized as energy storage materials for reversible Lithium-Ion Batteries(LIBs)benefiting from their tunable building blocks and adjusted electrochemical properties.However,the unsatisfied electrochemical behavior of CPs with poor conductivity and sluggish ion transport kinetics is still a bottle-neck for their large-scale energy storage applications in LIBs.Herein,we display the rational fabrication of a conductive Sn-based coordination polymer(Sn-DHTPA)via judiciously choosing suitable building units.The Sn-DHTPA is employed as anode for LIBs,exhibiting superior reversible storage capacity of 1142.6 m A h g^(-1) at 0.1 A g^(-1) after 100 cycles and impressive rate storage capability of 287.7 m A h g^(-1)at 20 A g^(-1).More importantly,a robust cycling performance of 205.5 m A h g^(-1) at an extra-high current density of 20 A g^(-1) are observed without remarkable capacity-fading up to1000 cycles.The behavior superiority of Sn-DHTPA is related to its advanced architecture with abundant lithium storage sites,high electrical conductivity and rapid lithium transport.A series of ex-situ characterizations reveal that the impressive lithium storage capacity is contributed by the redox active sites of both the aromatic linker and metal center related to in-situ generated metallic nanoparticles dispersed in the skeleton.
基金the National Natural Science Foundation of China to C.L.(No.32071188)Guangdong Basic and Applied Basic Research Foundation to C.L.(No.2020A1515010034)+1 种基金the Research Grants Council of the Hong Kong Special Administrative Region,China to G.Z.(Project No.16103719,16101120,and 161011121,AoE/M-403-16,AOE/M-401/20)Hong Kong Branch of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)to G.Z.(Project No.SMSEGL20SC01eH)and VPRDO19RD03-6.
文摘The abnormal expansion of G-rich hexanucleotide repeat,GGGGCC(G4C2),in chromosome 9 open reading frame 72(C9orf72)is known to be the prevailing genetic cause of two fatal degenerative neurological diseases,amyotrophic lateral sclerosis(ALS)and frontotemporal dementia(FTD).It is well known that the DNA G4C2 repeat expansion with different lengths can form G-quadruplexes which affect gene transcription related to ALS/FTD,therefore it is crucial to understand DNA G4C2 G-quadruplex structures.Herein,by utilizing nuclear magnetic resonance(NMR)spectroscopy,we examined DNA G-quadruplex structure adopted by two G4C2 hexanucleotide repeats with an inosine substitution at position 4,d(G4C2)2-I4.We show that d(G4C2)2-I4 folds into an eight-layer parallel tetrameric G-quadruplex containing two parallel dimeric G-quadruplexes stacking together through p-p interaction via 50-to-50 mode in solution.Each dimeric G-quadruplex unit involves two propeller loops composed of two cytosine bases.This result is consistent with the observation in the crystal structure of d(G4C2)2.Our work not only sheds light on the structural diversity of G-quadruplexes adopted by d(G4C2)n but also provides a structural basis for drug design in treatment of ALS and FTD.
基金jointly supported by National Social Science Foundation of China (Grant No.:10&ZD134)Jiangsu College Graduate Research and Innovation Plan (Grant No.:CXLX13_065)
文摘Purpose: Focusing on a comparative analysis of information visualization in library and information science(LIS) from the perspective of research subject and intellectual base, this paper aims to discover the difference and coherence between Chinese domestic studies on information visualization and those of other areas of the world so as to show their theoretical foundation and development trend in a more objective way.Design/methodology/approach: By using the social network analysis tool Ucinet, we have first constructed networks of key author collaboration for 651 articles retrieved from the Chinese Social Sciences Citation Index(CSSCI) and 910 from the Web of Science(WoS),which were published on information visualization between 1998 and 2012 in library and information science, then we compared the intellectual base by mapping analysis from perspective of half-life, centrality and burst detection with CiteSpace II.Findings: Up to date, 51 countries and regions have contributed to the research of information visualization, and in total, we found 9 research clusters of author co-occurrence matrices,among which three are in China. Within Chinese co-author networks, most Chinese scholars have come from the same research institutions, that is to say, more international cooperation and exchange are still required for the research of information visualization across different disciplines and regions.Research limitations: This co-author network and co-citation analysis is mainly based on the research field of LIS with a focus of the WoS and CSSCI databases only, further samples are required for more generalized results to increase our understanding on the development trend of information visualization.Practical implications: This study could lead to a better understanding of the applications of information visualization technologies in discovering the development trend of a research field. Originality/value: To the best of our knowledge, this is the first comparative analysis of research subject and intellectual base on information visualization, specifically, from the perspective of contributions of Chinese scholars in this regard. By dividing most frequently cited Chinese literature into two categories(original and non-original research papers), this paper shows the extent of contributions that Chinese domestic scholars have made to the research of information visualization, by revealing the contributions of different types of Chinese domestic papers on information visualization.
基金Supported by the National Natural Science Foundation of China,No.81401988China Postdoctoral Science Foundation,No.2019M661907+4 种基金Jiangsu Postdoctoral Science Foundation,No.2019K159,and No.2019Z153General Project of Jiangsu Provincial Health Committee,No.H2023136General Project of Nantong Municipal Health Committee,No.MS2023013Jiangsu Provincial Research Hospital,No.YJXYY202204-YSB28and College Student Innovation Program,No.202210304128Y,and No.2023103041055.
文摘Artificial Intelligence(AI)has increased as a potent tool in medicine,with promising oncology applications.The emergence of immunotherapy has transformed the treatment terrain for hepatocellular carcinoma(HCC),offering new hope to patients with this challenging malignancy.This article examines the role and future of AI in forecasting the effectiveness of immunotherapy in HCC.We highlight the potential of AI to revolutionize the prediction of therapy response,thus improving patient selection and clinical outcomes.The article further outlines the challenges and future research directions in this emerging field.
基金supported by the National Natural Science Foundation of China(Grant Nos.42102015&42288201)。
文摘The Kulun region is located in the eastern Bainaimiao arc belt on the southeastern margin of the Central Asian Orogenic Belt(CAOB),adjacent to the North China Craton(NCC)to the south.This region records the closure of the PaleoAsian Ocean during the Paleozoic to early Mesozoic and is key to study the tectonic evolution of the northern margin of the NCC.We conducted zircon U-Pb geochronology and Hf isotope analysis of volcanic-sedimentary and intrusive rocks in the Kulun region.The volcanic-sedimentary rocks were previously assigned an early Carboniferous age,but include volcanic rocks with ages of 267–266 Ma and sedimentary rocks with youngest detrital zircon age peaks of 265–244 Ma,which were intruded by a granite with an age of 242 Ma.This indicates that these rocks are actually middle Permian to Middle Triassic in age(267–242Ma)and correspond to the Qingfengshan and Liujiagou formations.Moreover,two volcanic rock samples have highεHf(t)values(+1.6 to+16.1)and relatively young two-stage Hf model ages(1095–327 Ma),indicating their sources associated with the CAOB.The age spectra and Hf isotopic characteristics of detrital zircons from the sedimentary rocks suggest that,during the middle Permian to Middle Triassic,the sedimentary provenance in the Kulun region was mainly the CAOB.However,by the Early Jurassic,the provenance changed to the NCC(i.e.,the Inner Mongolia Paleo-uplift,IMPU).This result,combined with the development of a series of conglomerates on the northern margin of the NCC in the Late Triassic(i.e.,Xingshikou,Xiaoyingzi,and Xiaohekou formations),indicates the Kulun region experienced an abrupt change in paleogeography during the Late Triassic,with the IMPU undergoing significant uplift and thus becoming the main sediment source in the Kulun region.Based on the Late Triassic alkaline igneous belt(235–215 Ma)in the IMPU,we speculate that this uplift was caused by detachment of the southward-subducting Paleo-Asian oceanic plate,which occurred in a post-orogenic extensional setting.The boundary between the NCC and CAOB(i.e.,the Bainaimiao arc belt)in the Kulun region is defined by the newly identified Paleoproterozoic granites(1.8 and 1.6 Ga)and our zircon geochronology and Hf isotope data.
