Heilongjiang reclamation area has made great progress since its development and construction, among which the agricultural and forestry colleges in China have played a key role in the input of talents for the producti...Heilongjiang reclamation area has made great progress since its development and construction, among which the agricultural and forestry colleges in China have played a key role in the input of talents for the production of reclamation area, and the spirit of the Great Wilderness has important strategic significance for the cultivation of agricultural and forestry talents. Taking Heilongjiang Bayi Agricultural University as an example, this paper analyzes the ways of the Great Northern Wilderness Spirit for cultivating application-oriented undergraduate talents in agricultural and forestry colleges, improving the curriculum system of undergraduate talents through innovation, strengthening the cultivation of students’ innovative ability, leading students’ scientific research and academic level, and enhancing students’ practical ability. To innovate the cultivation mode of application-oriented undergraduate talents in agricultural and forestry colleges under the guidance of the spirit of the Great Northern Wilderness, and to provide a reference mode for the cultivation of undergraduate talents in agricultural and forestry colleges in China.展开更多
Potassium-ion batteries(PIBs)are a promising candidate for next-generation electric energy storage applications because of the abundance and low cost of potassium.However,the development of PIBs is limited by sluggish...Potassium-ion batteries(PIBs)are a promising candidate for next-generation electric energy storage applications because of the abundance and low cost of potassium.However,the development of PIBs is limited by sluggish kinetics and huge volume expansion of anodes,leading to poor rate capability and cycling stability.Herein,an advanced superstructure anode,including Te-doped SnS_(2) nanosheets uniformly anchored on MXene surface(Te-SnS_(2)/MXene),is rationally designed for the first time to boost K^(+)storage performance.Featuring with strong interface interaction and self-autoadjustable interlayer spacings,the Te-SnS_(2)/MXene can efficiently accelerate electron/ion transfer,accommodate volume expansion,inhibit crack formation,and improve pseudocapacitive contribution during cycling.Thus,the novel Te-SnS_(2)/MXene anode delivers a high reversible capacity(343.2 mAh g^(-1) after 50 cycles at0.2 A g^(-1)),outstanding rate capability(186.4 mAh g^(-1) at 20 A g^(-1)),long cycle stability(165.8 mAh g^(-1)after 5000 cycles at 10 A g^(-1) with a low electrode swelling rate of only 15.4%),and reliable operation in flexible full battery.The present Te-SnS_(2)/MXene becomes among the best transition metal-based anode materials for PIBs reported to date.展开更多
Carbon fiber(CF)has emerged as a promising candidate for microwave absorbers to resolve the escalating electromagnetic wave(EMW)pollution issue,not just serving as a structural reinforcement.However,the drawbacks,such...Carbon fiber(CF)has emerged as a promising candidate for microwave absorbers to resolve the escalating electromagnetic wave(EMW)pollution issue,not just serving as a structural reinforcement.However,the drawbacks,such as high conductivity,limit its ability to strongly absorb EMWs over a wide bandwidth.To address these challenges,graphite wrapped FeNi_(3)/Co with carbon nanotubes(CNTs)anchored on MgO@CF heterostructures were synthesized by introducing MgO nanofilms on a CF surface and subsequent chemical vapor deposition catalyzed by two-phase catalysts.The synthesis of MgO sup-presses the etching of CF during the experimental processes,effectively maintaining the inherent structure of CF,which is conducive to constructing rich conductive networks and developing excellent mechanical properties.By modulating the catalyst concentration,deposited CNTs with appropriate defects increase the conduction loss and stimulate defect polariza-tion loss.The abundant interfaces formed by multiple components lead to fulfilling interface polarization,while the doping of O heteroatoms causes dipole polarization.In addition,the introduction of FeNi_(3)/Co generates effective magnetic loss and optimizes electromagnetic parameters to form more matching impedance conditions.At a low filler loading of 23 wt%,the stable sample obtains a remarkable minimum reflection loss of up to-72.08 dB at merely 1.38 mm with an effective absorption bandwidth reaching 4.88 GHz at only 1.44 mm,which is superior to that of numerous distinguished carbon-based composites in regard to being“thin,light,wide and strong”.CST simulation reveals that the maximum radar cross section reduction acquires 26.88 dBm2,ascertaining the radar stealth capability of the distinctive heterostructure.Moreover,great mechanical and electromagnetic interference shielding performance is demonstrated by epoxy composites.Henceforth,this study proposes profound insights into the intricate relationship between the structure and EMW absorbing mechanism,and elucidates an attractive strategy for mass-producing modified CF-based hybrids for versatile applications.展开更多
Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework(MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path.To overcome this l...Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework(MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path.To overcome this limitation,in this work,MOF-derived hierarchical Cu_(9)S_(5)/C nanocomposite fibers are fabricated by electrospinning and subsequent carbonization-sulfurization process.Morphological analyses show that MOF-derived octahedral Cu_(9)S_(5)/C particles are evenly monodis-persed inside carbonaceous fibers.This configuration creates a unique hierarchical structure,ranging from Cu_(9)S_(5)particle embedding,MOF-derived skeleton,to a three-dimensional network.The optimized composite fibers(Cu_(9)S_(5)/C-40)exhibit extraordinary electromagnetic wave absorption performance at a low mass fraction(20 wt%):the minimum reflection loss value reaches-69.6 dB,and the maximum effective absorption bandwidth achieves 5.81 GHz with an extremely thin thick-ness of only 1.83 mm.Systematic investigations demonstrate that constructing the three-dimensional conductive network to connect MOF derivatives is crucial for activating performance enhancement.The unique nano-micro hierarchical structure synergized with elaborate-configured components endows the materials with optimal impedance matching and amplifies the loss capacity of each part.This work provides a reliable example and theoretical guidance for fabricating new-generation high-efficiency MOF-derived fibrous electromagnetic wave absorbers.展开更多
Transition metal dichalcogenides(TMDs), exhibit a range of crystal structures and topological quantum states. The1T phase, in particular, shows promise for superconductivity driven by electron–phonon coupling(EPC), s...Transition metal dichalcogenides(TMDs), exhibit a range of crystal structures and topological quantum states. The1T phase, in particular, shows promise for superconductivity driven by electron–phonon coupling(EPC), strain, pressure,and chemical doping. In this theoretical investigation, we explore 1T-Rh Se Te as a novel type of TMD superconductor with topological electronic states. The optimal doping structure and atomic arrangement of 1T-Rh Se Te are constructed.Phonon spectrum calculations validate the integrity of the constructed doping structure. The analysis of the electron–phonon coupling using the electron–phonon Wannier(EPW) method has confirmed the existence of a robust electron–phonon interaction in 1T-Rh Se Te, resulting in total EPC constant λ = 2.02, the logarithmic average frequency ω_(log)= 3.15 me V and T_c = 4.61 K, consistent with experimental measurements and indicative of its classification as a BCS superconductor.The band structure analysis revealed the presence of Dirac-like band crossing points. The topological non-trivial electronic structures of the 1T-Rh Se Te are confirmed via the evolution of Wannier charge centers(WCCs) and time-reversal symmetryprotected topological surface states(TSSs). These distinctive properties underscore 1T-Rh Se Te as a possible candidate for a topological superconductor, warranting further investigation into its potential implications and applications.展开更多
Cystic echinococcosis,which is caused by larval infection of Echinococcus granulosus(E.granulosus)sensu lato,is a widespread chronic cyst-forming helminthic disease that affects up to 3 million people.1 E.granulosus c...Cystic echinococcosis,which is caused by larval infection of Echinococcus granulosus(E.granulosus)sensu lato,is a widespread chronic cyst-forming helminthic disease that affects up to 3 million people.1 E.granulosus can actively divert the host immune response towards anergy and anti-inflammatory pathways.2 Previous studies have shown that E.granulosus can escape host immunosurveillance by modulating the maturation of dendritic cells(DCs).3,4 Nevertheless,how E.granulosus,an extracellular pathogen,modulates the inflammatory response in DCs remains poorly understood.In this study,we investigated the effects of E.granulosus cyst fluid(EgCF)on bone marrow-derived DCs(BMDCs)exposed to LPS,an inflammatory stimulus,and the mechanisms involved in the EgCF–DCs immune modulation.展开更多
Background Although complete resolution and recovery occurs in most children with an initial attack of acute pancreatitis(AP),a subset of children may progress to recurrent AP(RAP).RAP has serious effects to the indiv...Background Although complete resolution and recovery occurs in most children with an initial attack of acute pancreatitis(AP),a subset of children may progress to recurrent AP(RAP).RAP has serious effects to the individual and the socioeconomic burden.The aim of this project was to identify the independent risk factors for pediatric RAP so as to provide evidence for its prevention,early diagnosis and treatment.Methods A retrospective cohort study of children discharged from Tianjin Children’s Hospital from June 2017 to January 2020 was performed.Demographic and clinical variables,treatment strategies,clinical course and outcomes were collected.Independent risk factors of RAP were identified using the logistic regression model.Results Of the total 96 enrolled children,30(31.3%)developed RAP during the follow-up period.The majority(27/30,90%)of the children with AP developed RAP within 6 months of their first AP attack.The presence of systemic inflammatory response syndrome(SIRS)[odds ratio(OR)=6.652,95%confidence interval(CI)1.989 to 22.247],fasting time(OR=1.267,95%CI 1.104 to 1.583),whether meet all three AP diagnostic criteria(OR=7.438,95%CI 1.346 to 41.103)and abnormal amylase/lipase value on the seventh day of hospitalization(OR=3.601,95%CI 0.972 to 13.342)were independent risk factors of RAP in children.Conclusions Most children who developed RAP had progressed within 6 months after their first episode of AP.RAP was more common in children who met all three AP diagnostic criteria at initial attack and in children with SIRS,long fasting time and abnormal amylase/lipase value on the seventh day of hospitalization.展开更多
Biliary atresia(BA)is a rare life-limiting fibroobliterative disorder of the bile ducts that can advance to end-stage liver disease,with an incidence of approximately 1:8000–1:18000.1 BA is characterized by the onset...Biliary atresia(BA)is a rare life-limiting fibroobliterative disorder of the bile ducts that can advance to end-stage liver disease,with an incidence of approximately 1:8000–1:18000.1 BA is characterized by the onset of persistent cholestatic jaundice during the neonatal period,yet the underlying etiology is not well understood.However,about 10%of infants with BA exhibit other congenital anomalies—a distinctive subgroup commonly referred to as biliary atresia splenic malformation(BASM)syndrome and others such as polysplenia or polysplenia syndrome.2 The incidence of the syndromic form of BA is lower in Japan and South Asia.展开更多
文摘Heilongjiang reclamation area has made great progress since its development and construction, among which the agricultural and forestry colleges in China have played a key role in the input of talents for the production of reclamation area, and the spirit of the Great Wilderness has important strategic significance for the cultivation of agricultural and forestry talents. Taking Heilongjiang Bayi Agricultural University as an example, this paper analyzes the ways of the Great Northern Wilderness Spirit for cultivating application-oriented undergraduate talents in agricultural and forestry colleges, improving the curriculum system of undergraduate talents through innovation, strengthening the cultivation of students’ innovative ability, leading students’ scientific research and academic level, and enhancing students’ practical ability. To innovate the cultivation mode of application-oriented undergraduate talents in agricultural and forestry colleges under the guidance of the spirit of the Great Northern Wilderness, and to provide a reference mode for the cultivation of undergraduate talents in agricultural and forestry colleges in China.
基金financially supported by the National Natural Science Foundation of China(22005223 and 21975187)the Natural Science Foundation of Guangdong Province(No.2019A1515012161)+8 种基金the Special Innovational Project of Department of Education of Guangdong Province(No.2019KTSCX186 and 2017KCXTD031)the Science Foundation for Young Teachers of Wuyi University(2019td01)the Science Foundation for HighLevel Talents of Wuyi University(2018RC50 and 2017RC23)the Innovative Leading Talents of Jiangmen(Jiangren(2019)7)the Science and Technology Projects of Jiangmen(No.(2017)307,(2017)149,(2018)352)the Newton Advanced Fellowships(NAF/R2/180603)the Wuyi University-Hong Kong-Macao Joint Research Project(2019WGALH10)the Laboratory of Optoelectronic Materials and Applications in Guangdong Higher Education(2017KSYS011)the College Student Innovation and Entrepreneurship Training Program Project(2019CX27,2019CX32,2019CX41,201911349021,201911349025)。
文摘Potassium-ion batteries(PIBs)are a promising candidate for next-generation electric energy storage applications because of the abundance and low cost of potassium.However,the development of PIBs is limited by sluggish kinetics and huge volume expansion of anodes,leading to poor rate capability and cycling stability.Herein,an advanced superstructure anode,including Te-doped SnS_(2) nanosheets uniformly anchored on MXene surface(Te-SnS_(2)/MXene),is rationally designed for the first time to boost K^(+)storage performance.Featuring with strong interface interaction and self-autoadjustable interlayer spacings,the Te-SnS_(2)/MXene can efficiently accelerate electron/ion transfer,accommodate volume expansion,inhibit crack formation,and improve pseudocapacitive contribution during cycling.Thus,the novel Te-SnS_(2)/MXene anode delivers a high reversible capacity(343.2 mAh g^(-1) after 50 cycles at0.2 A g^(-1)),outstanding rate capability(186.4 mAh g^(-1) at 20 A g^(-1)),long cycle stability(165.8 mAh g^(-1)after 5000 cycles at 10 A g^(-1) with a low electrode swelling rate of only 15.4%),and reliable operation in flexible full battery.The present Te-SnS_(2)/MXene becomes among the best transition metal-based anode materials for PIBs reported to date.
基金supported by the Natural Science Foundation of Shandong Prov-ince(ZR2021ME194,2022TSGC2448,2023TSGC0545)the Key Technology Research and Development Program of Shandong Province(2021ZLGX01).
文摘Carbon fiber(CF)has emerged as a promising candidate for microwave absorbers to resolve the escalating electromagnetic wave(EMW)pollution issue,not just serving as a structural reinforcement.However,the drawbacks,such as high conductivity,limit its ability to strongly absorb EMWs over a wide bandwidth.To address these challenges,graphite wrapped FeNi_(3)/Co with carbon nanotubes(CNTs)anchored on MgO@CF heterostructures were synthesized by introducing MgO nanofilms on a CF surface and subsequent chemical vapor deposition catalyzed by two-phase catalysts.The synthesis of MgO sup-presses the etching of CF during the experimental processes,effectively maintaining the inherent structure of CF,which is conducive to constructing rich conductive networks and developing excellent mechanical properties.By modulating the catalyst concentration,deposited CNTs with appropriate defects increase the conduction loss and stimulate defect polariza-tion loss.The abundant interfaces formed by multiple components lead to fulfilling interface polarization,while the doping of O heteroatoms causes dipole polarization.In addition,the introduction of FeNi_(3)/Co generates effective magnetic loss and optimizes electromagnetic parameters to form more matching impedance conditions.At a low filler loading of 23 wt%,the stable sample obtains a remarkable minimum reflection loss of up to-72.08 dB at merely 1.38 mm with an effective absorption bandwidth reaching 4.88 GHz at only 1.44 mm,which is superior to that of numerous distinguished carbon-based composites in regard to being“thin,light,wide and strong”.CST simulation reveals that the maximum radar cross section reduction acquires 26.88 dBm2,ascertaining the radar stealth capability of the distinctive heterostructure.Moreover,great mechanical and electromagnetic interference shielding performance is demonstrated by epoxy composites.Henceforth,this study proposes profound insights into the intricate relationship between the structure and EMW absorbing mechanism,and elucidates an attractive strategy for mass-producing modified CF-based hybrids for versatile applications.
基金supported by the Natural Science Foundation of Shandong Province(ZR2021ME194,2022TSGC2448,2023TSGC0545)the key research and development program of Shandong Province(2021ZLGX01).
文摘Refining the electromagnetic wave absorption characteristics of traditional metal–organic framework(MOF)-derived carbon composites remains a challenge because of their discontinuous conductive path.To overcome this limitation,in this work,MOF-derived hierarchical Cu_(9)S_(5)/C nanocomposite fibers are fabricated by electrospinning and subsequent carbonization-sulfurization process.Morphological analyses show that MOF-derived octahedral Cu_(9)S_(5)/C particles are evenly monodis-persed inside carbonaceous fibers.This configuration creates a unique hierarchical structure,ranging from Cu_(9)S_(5)particle embedding,MOF-derived skeleton,to a three-dimensional network.The optimized composite fibers(Cu_(9)S_(5)/C-40)exhibit extraordinary electromagnetic wave absorption performance at a low mass fraction(20 wt%):the minimum reflection loss value reaches-69.6 dB,and the maximum effective absorption bandwidth achieves 5.81 GHz with an extremely thin thick-ness of only 1.83 mm.Systematic investigations demonstrate that constructing the three-dimensional conductive network to connect MOF derivatives is crucial for activating performance enhancement.The unique nano-micro hierarchical structure synergized with elaborate-configured components endows the materials with optimal impedance matching and amplifies the loss capacity of each part.This work provides a reliable example and theoretical guidance for fabricating new-generation high-efficiency MOF-derived fibrous electromagnetic wave absorbers.
基金Project supported by the National Natural Science Foundation of China (Grant No. 12204400)Science Research Project of Hebei Education Department (Grant No. QN2022169)+1 种基金the Natural Science Foundation of Hebei Province (Grant Nos. A2022203010 and A2024203011)Innovation Capability Improvement Project of Hebei Province (Grant No. 22567605H)。
文摘Transition metal dichalcogenides(TMDs), exhibit a range of crystal structures and topological quantum states. The1T phase, in particular, shows promise for superconductivity driven by electron–phonon coupling(EPC), strain, pressure,and chemical doping. In this theoretical investigation, we explore 1T-Rh Se Te as a novel type of TMD superconductor with topological electronic states. The optimal doping structure and atomic arrangement of 1T-Rh Se Te are constructed.Phonon spectrum calculations validate the integrity of the constructed doping structure. The analysis of the electron–phonon coupling using the electron–phonon Wannier(EPW) method has confirmed the existence of a robust electron–phonon interaction in 1T-Rh Se Te, resulting in total EPC constant λ = 2.02, the logarithmic average frequency ω_(log)= 3.15 me V and T_c = 4.61 K, consistent with experimental measurements and indicative of its classification as a BCS superconductor.The band structure analysis revealed the presence of Dirac-like band crossing points. The topological non-trivial electronic structures of the 1T-Rh Se Te are confirmed via the evolution of Wannier charge centers(WCCs) and time-reversal symmetryprotected topological surface states(TSSs). These distinctive properties underscore 1T-Rh Se Te as a possible candidate for a topological superconductor, warranting further investigation into its potential implications and applications.
基金supported by the National Natural Science Foundation of China(81760371,81760570,81602810,81703174)the XPCC Youth Science and Technology Innovation Leading Talent Program(2018CB017)Key Areas of Science and Technology Projects(2019AB031).
文摘Cystic echinococcosis,which is caused by larval infection of Echinococcus granulosus(E.granulosus)sensu lato,is a widespread chronic cyst-forming helminthic disease that affects up to 3 million people.1 E.granulosus can actively divert the host immune response towards anergy and anti-inflammatory pathways.2 Previous studies have shown that E.granulosus can escape host immunosurveillance by modulating the maturation of dendritic cells(DCs).3,4 Nevertheless,how E.granulosus,an extracellular pathogen,modulates the inflammatory response in DCs remains poorly understood.In this study,we investigated the effects of E.granulosus cyst fluid(EgCF)on bone marrow-derived DCs(BMDCs)exposed to LPS,an inflammatory stimulus,and the mechanisms involved in the EgCF–DCs immune modulation.
基金supported by the National Key R&D Program of China(2021YFA1201200)the National Natural Science Foundation of China(51973188,21774109,and 52203194)+3 种基金the Natural Science Foundation of Zhejiang Province(LR18E030002)the Zhejiang University Education Foundation Global Partnership Fundthe National Postdoctoral Program for Innovative Talent(BX20190297)the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2019BT02X105)。
基金funded by the National Natural Science Foundation of China(grant number 81570471)Xinjiang Uygur Autonomous Region Science Foundation Projects(grant number 2019D01A12)Tianjin Health Bureau special grant(grant number 14KG129).
文摘Background Although complete resolution and recovery occurs in most children with an initial attack of acute pancreatitis(AP),a subset of children may progress to recurrent AP(RAP).RAP has serious effects to the individual and the socioeconomic burden.The aim of this project was to identify the independent risk factors for pediatric RAP so as to provide evidence for its prevention,early diagnosis and treatment.Methods A retrospective cohort study of children discharged from Tianjin Children’s Hospital from June 2017 to January 2020 was performed.Demographic and clinical variables,treatment strategies,clinical course and outcomes were collected.Independent risk factors of RAP were identified using the logistic regression model.Results Of the total 96 enrolled children,30(31.3%)developed RAP during the follow-up period.The majority(27/30,90%)of the children with AP developed RAP within 6 months of their first AP attack.The presence of systemic inflammatory response syndrome(SIRS)[odds ratio(OR)=6.652,95%confidence interval(CI)1.989 to 22.247],fasting time(OR=1.267,95%CI 1.104 to 1.583),whether meet all three AP diagnostic criteria(OR=7.438,95%CI 1.346 to 41.103)and abnormal amylase/lipase value on the seventh day of hospitalization(OR=3.601,95%CI 0.972 to 13.342)were independent risk factors of RAP in children.Conclusions Most children who developed RAP had progressed within 6 months after their first episode of AP.RAP was more common in children who met all three AP diagnostic criteria at initial attack and in children with SIRS,long fasting time and abnormal amylase/lipase value on the seventh day of hospitalization.
基金supported by grants from Xinjiang Uygur Autonomous Region Science Foundation Projects(grant numbers 2019D01A12 and 2021D01A38).
文摘Biliary atresia(BA)is a rare life-limiting fibroobliterative disorder of the bile ducts that can advance to end-stage liver disease,with an incidence of approximately 1:8000–1:18000.1 BA is characterized by the onset of persistent cholestatic jaundice during the neonatal period,yet the underlying etiology is not well understood.However,about 10%of infants with BA exhibit other congenital anomalies—a distinctive subgroup commonly referred to as biliary atresia splenic malformation(BASM)syndrome and others such as polysplenia or polysplenia syndrome.2 The incidence of the syndromic form of BA is lower in Japan and South Asia.
