The ion conductivity of a solid-state ion conductor generally increases exponentially upon reduction in ionmigration barrier.For prevalent cathode material LiCoO_(2),the room-temperature ion conductivity and migration...The ion conductivity of a solid-state ion conductor generally increases exponentially upon reduction in ionmigration barrier.For prevalent cathode material LiCoO_(2),the room-temperature ion conductivity and migrationbarrier are respectively around 10^(−4)S/cm and 0.3 eV.In this Letter,through first-principles calculations we predictthe existence of 1D superionicity as the Li ions in O_(2)LiCoO_(2)are transformed into Zn_(0.5)CoO_(2)or Li_(0.5)CoO_(2)via cation-exchange reaction or deintercalation.The ion migration barriers(0.01-0.02 eV)even lower than roomtemperature∼𝑘B𝑇are reduced by more than an order of magnitude compared with LiCoO_(2),which are facilitatedby facile transition of mobile ions between two coordination configurations.The room-temperature ion conductivityis estimated to be over 50 S/cm,enhanced by 2-3 orders of magnitude compared with the current highestreported value.Such unprecedented superionicity may also exist in other similar layered ion conductors,whichmay lead to technical advances and exotic effects such as ultrafast ion batteries and quantized ferroelectricity.展开更多
Transformations of the world unseen in a century are unfolding at a faster pace.Changes of the world,of our times,and of the historical trajectory are taking place in ways like never before.As the new round of technol...Transformations of the world unseen in a century are unfolding at a faster pace.Changes of the world,of our times,and of the historical trajectory are taking place in ways like never before.As the new round of technological revolution and industrial transformation advances,the international power structure and world order are undergoing tectonic realignments and constantly being reshaped.The protracted Ukraine crisis and the escalating Palestinian-Israeli conflict exemplify the intensification of major-power strategic rivalries and geopolitical conflicts.At the same time,non-traditional security issues are getting severe and more deeply intertwined with traditional security.Challenges such as climate change,cybersecurity,energy security,and food security are becoming critical global issues which confront humanity with unprecedented threats and herald a new era of instability and transformation for the world’s development.展开更多
Under the guidance of the approach which integrates molecular networking,MolNetEnhancer and Net-work Annotation Propagation(NAP),daphnaltaicanoids A and B(1 and 2)with unprecedented 9-oxa-tetracyclo[6.6.1.0^(2,6).0^(8...Under the guidance of the approach which integrates molecular networking,MolNetEnhancer and Net-work Annotation Propagation(NAP),daphnaltaicanoids A and B(1 and 2)with unprecedented 9-oxa-tetracyclo[6.6.1.0^(2,6).0^(8,13)]pentadecane and tetracyclo[5.3.0.1^(2,5).2^(4,11)]tridecane central frameworks were iso-lated from Daphne altaica Pall.,representing two types of unparalleled meroterpenoid cores.Their struc-tures were elucidated by extensive spectroscopic analysis,nuclear magnetic resonance(NMR)calcula-tions,DP4+analysis and electronic circular dichroism(ECD)calculations.The plausible biosynthetic path-ways for 1 and 2 were postulated.Biologically,2 exerted potent neuroprotective activities which were su-perior to trolox at 12.5 and 25μmol/L.Moreover,1 and 2 exhibited more noticeable acetylcholinesterase inhibitory activities than donepezil.Molecular docking simulations were performed to explore the inter-molecular interaction of compounds 1 and 2 with acetylcholinesterase.The bioactivity evaluation results highlight the prospects of 1 and 2 as a novel category of neurological agents.展开更多
To the editor The present problematic outbreak in Africa is the Ebola virus infection among local population in the capital of Guinea.It becomes a great concern since the present outbreak(March to April 2014)is consid...To the editor The present problematic outbreak in Africa is the Ebola virus infection among local population in the capital of Guinea.It becomes a great concern since the present outbreak(March to April 2014)is considered to be the biggest outbreak,the first discovery of this viral infection[1].A high death rate can be seen.Severe diarrhea and bleeding can be seen in almost all cases and death rate is very high(about 75%).Focusing on the present outbreak,there are many considerations on this situation.First,this outbreak occurs in urban area insead of a remote rural area。展开更多
ZTE Corporation,a leading global provider of telecommunications equipment and network solutions,announced on June 6,2007 that it has signed a strategic cooperation agreement with Polkomtel S.A.,one of the top three mo...ZTE Corporation,a leading global provider of telecommunications equipment and network solutions,announced on June 6,2007 that it has signed a strategic cooperation agreement with Polkomtel S.A.,one of the top three mobile telephony operators in Poland.展开更多
China＇s Xinhua News Agency calls it the ＂biggest government reshuffle in years＂ in what is seen as a dra matic continuation of the previous seven rounds of cabinet restructuring that began in 1982.
Nickel-based layered double hydroxides(LDHs)are widely recognized as promising substitutes for noble metal catalysts in the oxygen evolution reaction(OER).However,conventional Ni^(2+)sites exhibit a high-spin configur...Nickel-based layered double hydroxides(LDHs)are widely recognized as promising substitutes for noble metal catalysts in the oxygen evolution reaction(OER).However,conventional Ni^(2+)sites exhibit a high-spin configuration(d_(xz)^(2)d_(yz)^(2)d_(xy)^(2)d_(x^(2)-y^(2))^(1)d_(z^(2))^(1))with excessive frontier-orbital occupancy,resulting in weak binding strength toward oxygen intermediates,which dramatically limits their OER performance.Herein,we first report the successful construction of low-spin state Ni^(2+)(d_(xz)^(2)d_(yz)^(2)d_(xy)^(2)d_(x^(2)-y^(2))^(1)d_(z^(2))^(0))in NiCoFe-LDH(LS-NCF)through oxygen defect engineering.LS-NCF exhibits a splendid OER activity with an ultralow overpotential of 241 mV at the current density of 1 A·cm^(−2),which is 79 mV lower than that of the conventional NiCoFe-LDH d_(z^(2)) with high-spin Ni^(2+)(HS-NCF),significantly outperforming previously reported transition metal-based catalysts.Comprehensive studies reveal that LS Ni^(2+)with reduced orbital occupancy effectively enhances oxygen intermediates adsorption through reinforcing the orbital hybridization between Ni 3d and O 2p.Moreover,the d-band center of LS Ni^(2+)is closer to the Fermi level compared to that of HS Ni^(2+),thus accelerating electron transfer.Consequently,the strengthened adsorption of ^(*)O intermediate and accelerated electron transfer in LS-NCF efficiently lower the reaction energy barrier of the rate-determining step(^(*)O→^(*)OOH),thereby greatly boosting its OER performance.This work provides valuable insights into designing high-performance Ni-based electrocatalysts via spintronic-level engineering.展开更多
Fluorooxoborate has emerged as a promising system for exploring optical materials due to their rich structural chemistry and physicochemical properties,yet so far not fully studied.Herein,we report a new fluorooxobora...Fluorooxoborate has emerged as a promising system for exploring optical materials due to their rich structural chemistry and physicochemical properties,yet so far not fully studied.Herein,we report a new fluorooxoborate,Ba_(2)B_(9)O_(13)F_(4)·BF_(4),which contains the greatest variety of structural basic units,[BO_(3)],[BO_(2)F_(2)],[BO_(3)F],and[BF_(4)],and exhibits unprecedented 1D infinite[B_(18)O_(26)F_(8)]tubes.The unique structure avoids the dangling bonds caused by terminal oxygens,which is beneficial to the large bandgap and deep-ultraviolet cutoff edge.This article expands the crystal structure of fluorooxoborates and contributes to the exploration of deep-ultraviolet optical materials in fluorooxoborate systems.展开更多
With the support by the National Natural Science Foundation of China,Prof.Wu Zhongshuai(吴忠帅)and Prof.Bao Xinhe(包信和)et al.from Dalian Institute of Chemical Physics,Chinese Academy Sciences developed graphene-base...With the support by the National Natural Science Foundation of China,Prof.Wu Zhongshuai(吴忠帅)and Prof.Bao Xinhe(包信和)et al.from Dalian Institute of Chemical Physics,Chinese Academy Sciences developed graphene-based linear tandem micro-supercapacitors with metal-free current collectors and high-展开更多
With the support by the National Natural Science Foundation of China,the research team led by Prof.You ZhengWei(游正伟)at the State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of M...With the support by the National Natural Science Foundation of China,the research team led by Prof.You ZhengWei(游正伟)at the State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Material Science&Engineering,International Joint Laboratory for Advanced Fiber and Low-dimension Materials,Donghua University,recently reported a highly efficient self-healing elastomer with unprecedented mechanical properties,which was published in Advanced Materials(2019,1901402).展开更多
On the eve of the 10th anniversary of Hong Kong's return to China and the implementation of the Basic Law of the Hong Kong Special Administrative Region, Beijing Review reporter Li Li spoke to Professor Xu Chongde...On the eve of the 10th anniversary of Hong Kong's return to China and the implementation of the Basic Law of the Hong Kong Special Administrative Region, Beijing Review reporter Li Li spoke to Professor Xu Chongde from the Law School of Renmin University of China, a Basic Law drafter, about how the law was created and its spirit.展开更多
From the end of February to early March, China pulled out 35,860 nationals trapped in violent Libya, with the help of diplomatic resources and all means of transportation. The largest scale evacuation around the globe...From the end of February to early March, China pulled out 35,860 nationals trapped in violent Libya, with the help of diplomatic resources and all means of transportation. The largest scale evacuation around the globe since the end of the Cold War was展开更多
The domestic consumption figures followed data this year showing increases in Chinese consumer confidence that prompted some economists to raise their next-year growth forecasts for China’s textile
Dear Editor,Zika virus（ZIKV）is a mosquito-borne flavivirus that usually causes asymptomatic infections or mild illness in humans.However,the unprecedented epidemics of ZIKV in Latin America since early 2015 have mad...Dear Editor,Zika virus（ZIKV）is a mosquito-borne flavivirus that usually causes asymptomatic infections or mild illness in humans.However,the unprecedented epidemics of ZIKV in Latin America since early 2015 have made this flavivirus an international health risk（Liu and Zhang,2016）.展开更多
The significant increase in the number of older adults in China,coupled with continuing industrialization and urbanization,has profound social and economic ramifications,including the evolution of major challenges to ...The significant increase in the number of older adults in China,coupled with continuing industrialization and urbanization,has profound social and economic ramifications,including the evolution of major challenges to public health,elder care services,policy-making,and the nation’s healthcare system.While the unprecedented changes in political and economic structures have obviously increased China’s productivity and revenues,what is less well understood is how they展开更多
Since early 2015,an unprecedented outbreak of Zika virus(ZIKV)infection that recognized in northeast Brazil has spread to Latin America(Schuler-Faccini,2016).As of January 2016,there has been confirmed autochthonous t...Since early 2015,an unprecedented outbreak of Zika virus(ZIKV)infection that recognized in northeast Brazil has spread to Latin America(Schuler-Faccini,2016).As of January 2016,there has been confirmed autochthonous transmission of ZIKV in 19 countries in the Americas outside Brazil(Hennessey,2016).展开更多
基金supported by the National Natural Science Foundation of China(Grant No.22073034)。
文摘The ion conductivity of a solid-state ion conductor generally increases exponentially upon reduction in ionmigration barrier.For prevalent cathode material LiCoO_(2),the room-temperature ion conductivity and migrationbarrier are respectively around 10^(−4)S/cm and 0.3 eV.In this Letter,through first-principles calculations we predictthe existence of 1D superionicity as the Li ions in O_(2)LiCoO_(2)are transformed into Zn_(0.5)CoO_(2)or Li_(0.5)CoO_(2)via cation-exchange reaction or deintercalation.The ion migration barriers(0.01-0.02 eV)even lower than roomtemperature∼𝑘B𝑇are reduced by more than an order of magnitude compared with LiCoO_(2),which are facilitatedby facile transition of mobile ions between two coordination configurations.The room-temperature ion conductivityis estimated to be over 50 S/cm,enhanced by 2-3 orders of magnitude compared with the current highestreported value.Such unprecedented superionicity may also exist in other similar layered ion conductors,whichmay lead to technical advances and exotic effects such as ultrafast ion batteries and quantized ferroelectricity.
文摘Transformations of the world unseen in a century are unfolding at a faster pace.Changes of the world,of our times,and of the historical trajectory are taking place in ways like never before.As the new round of technological revolution and industrial transformation advances,the international power structure and world order are undergoing tectonic realignments and constantly being reshaped.The protracted Ukraine crisis and the escalating Palestinian-Israeli conflict exemplify the intensification of major-power strategic rivalries and geopolitical conflicts.At the same time,non-traditional security issues are getting severe and more deeply intertwined with traditional security.Challenges such as climate change,cybersecurity,energy security,and food security are becoming critical global issues which confront humanity with unprecedented threats and herald a new era of instability and transformation for the world’s development.
基金supported by the National Natural Science Foundation of China(Nos.82073736,81872766)Science and Technology Planning Project of Liaoning Province(No.2021JH1/10400049)Liaoning revitalization talents program(Nos.XLYC2002066,XLYC2007180).
文摘Under the guidance of the approach which integrates molecular networking,MolNetEnhancer and Net-work Annotation Propagation(NAP),daphnaltaicanoids A and B(1 and 2)with unprecedented 9-oxa-tetracyclo[6.6.1.0^(2,6).0^(8,13)]pentadecane and tetracyclo[5.3.0.1^(2,5).2^(4,11)]tridecane central frameworks were iso-lated from Daphne altaica Pall.,representing two types of unparalleled meroterpenoid cores.Their struc-tures were elucidated by extensive spectroscopic analysis,nuclear magnetic resonance(NMR)calcula-tions,DP4+analysis and electronic circular dichroism(ECD)calculations.The plausible biosynthetic path-ways for 1 and 2 were postulated.Biologically,2 exerted potent neuroprotective activities which were su-perior to trolox at 12.5 and 25μmol/L.Moreover,1 and 2 exhibited more noticeable acetylcholinesterase inhibitory activities than donepezil.Molecular docking simulations were performed to explore the inter-molecular interaction of compounds 1 and 2 with acetylcholinesterase.The bioactivity evaluation results highlight the prospects of 1 and 2 as a novel category of neurological agents.
文摘To the editor The present problematic outbreak in Africa is the Ebola virus infection among local population in the capital of Guinea.It becomes a great concern since the present outbreak(March to April 2014)is considered to be the biggest outbreak,the first discovery of this viral infection[1].A high death rate can be seen.Severe diarrhea and bleeding can be seen in almost all cases and death rate is very high(about 75%).Focusing on the present outbreak,there are many considerations on this situation.First,this outbreak occurs in urban area insead of a remote rural area。
文摘ZTE Corporation,a leading global provider of telecommunications equipment and network solutions,announced on June 6,2007 that it has signed a strategic cooperation agreement with Polkomtel S.A.,one of the top three mobile telephony operators in Poland.
文摘China＇s Xinhua News Agency calls it the ＂biggest government reshuffle in years＂ in what is seen as a dra matic continuation of the previous seven rounds of cabinet restructuring that began in 1982.
基金supported by the National Natural Science Foundation of China(Nos.22379023 and 22102007)the China Postdoctoral Science Foundation(No.2023M740555)+3 种基金Heilongjiang Provincial Postdoctoral Science Foundation(No.LBH-Z23001)Heilongjiang Provincial Natural Science Foundation Outstanding Youth Fund Project(No.YQ2024B002)the Foundation of State Key Laboratory of Catalysis(No.N-22-07)the Fundamental Research Funds for the Central Universities(No.2572023CT10).
文摘Nickel-based layered double hydroxides(LDHs)are widely recognized as promising substitutes for noble metal catalysts in the oxygen evolution reaction(OER).However,conventional Ni^(2+)sites exhibit a high-spin configuration(d_(xz)^(2)d_(yz)^(2)d_(xy)^(2)d_(x^(2)-y^(2))^(1)d_(z^(2))^(1))with excessive frontier-orbital occupancy,resulting in weak binding strength toward oxygen intermediates,which dramatically limits their OER performance.Herein,we first report the successful construction of low-spin state Ni^(2+)(d_(xz)^(2)d_(yz)^(2)d_(xy)^(2)d_(x^(2)-y^(2))^(1)d_(z^(2))^(0))in NiCoFe-LDH(LS-NCF)through oxygen defect engineering.LS-NCF exhibits a splendid OER activity with an ultralow overpotential of 241 mV at the current density of 1 A·cm^(−2),which is 79 mV lower than that of the conventional NiCoFe-LDH d_(z^(2)) with high-spin Ni^(2+)(HS-NCF),significantly outperforming previously reported transition metal-based catalysts.Comprehensive studies reveal that LS Ni^(2+)with reduced orbital occupancy effectively enhances oxygen intermediates adsorption through reinforcing the orbital hybridization between Ni 3d and O 2p.Moreover,the d-band center of LS Ni^(2+)is closer to the Fermi level compared to that of HS Ni^(2+),thus accelerating electron transfer.Consequently,the strengthened adsorption of ^(*)O intermediate and accelerated electron transfer in LS-NCF efficiently lower the reaction energy barrier of the rate-determining step(^(*)O→^(*)OOH),thereby greatly boosting its OER performance.This work provides valuable insights into designing high-performance Ni-based electrocatalysts via spintronic-level engineering.
基金supported by the National Key Research Project of China(2022YFE0134500)the National Natural Science Foundation of China(61922084,61835014)+4 种基金the West Light Foundation of Chinese Academy of Sciences(2019-YDYLTD-002)the Instrument Developing Project of Chinese Academy of Sciences(GJJSTD20200007)the Xinjiang Major Science and Technology Project(2021A01001)the International Partnership Program of Chinese Academy of Sciences(1A1365KYSB20200008)the Science and Technology Service Network Initiative of Chinese Academy of Sciences(KFJ-STS-QYZD-130)。
文摘Fluorooxoborate has emerged as a promising system for exploring optical materials due to their rich structural chemistry and physicochemical properties,yet so far not fully studied.Herein,we report a new fluorooxoborate,Ba_(2)B_(9)O_(13)F_(4)·BF_(4),which contains the greatest variety of structural basic units,[BO_(3)],[BO_(2)F_(2)],[BO_(3)F],and[BF_(4)],and exhibits unprecedented 1D infinite[B_(18)O_(26)F_(8)]tubes.The unique structure avoids the dangling bonds caused by terminal oxygens,which is beneficial to the large bandgap and deep-ultraviolet cutoff edge.This article expands the crystal structure of fluorooxoborates and contributes to the exploration of deep-ultraviolet optical materials in fluorooxoborate systems.
文摘With the support by the National Natural Science Foundation of China,Prof.Wu Zhongshuai(吴忠帅)and Prof.Bao Xinhe(包信和)et al.from Dalian Institute of Chemical Physics,Chinese Academy Sciences developed graphene-based linear tandem micro-supercapacitors with metal-free current collectors and high-
文摘With the support by the National Natural Science Foundation of China,the research team led by Prof.You ZhengWei(游正伟)at the State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Material Science&Engineering,International Joint Laboratory for Advanced Fiber and Low-dimension Materials,Donghua University,recently reported a highly efficient self-healing elastomer with unprecedented mechanical properties,which was published in Advanced Materials(2019,1901402).
文摘On the eve of the 10th anniversary of Hong Kong's return to China and the implementation of the Basic Law of the Hong Kong Special Administrative Region, Beijing Review reporter Li Li spoke to Professor Xu Chongde from the Law School of Renmin University of China, a Basic Law drafter, about how the law was created and its spirit.
文摘From the end of February to early March, China pulled out 35,860 nationals trapped in violent Libya, with the help of diplomatic resources and all means of transportation. The largest scale evacuation around the globe since the end of the Cold War was
文摘The domestic consumption figures followed data this year showing increases in Chinese consumer confidence that prompted some economists to raise their next-year growth forecasts for China’s textile
基金supported by the National Basic Research Program of China(Grants 2012CB518904)the National Natural Science Foundation of China(Grant No.81572003)+1 种基金the Core Facility and Technical Support,Wuhan Institute of VirologyWuhan Key Laboratory on Emerging Infectious Diseases and Biosafety for helpful supports during the course of the work
文摘Dear Editor,Zika virus（ZIKV）is a mosquito-borne flavivirus that usually causes asymptomatic infections or mild illness in humans.However,the unprecedented epidemics of ZIKV in Latin America since early 2015 have made this flavivirus an international health risk（Liu and Zhang,2016）.
文摘The significant increase in the number of older adults in China,coupled with continuing industrialization and urbanization,has profound social and economic ramifications,including the evolution of major challenges to public health,elder care services,policy-making,and the nation’s healthcare system.While the unprecedented changes in political and economic structures have obviously increased China’s productivity and revenues,what is less well understood is how they
文摘Since early 2015,an unprecedented outbreak of Zika virus(ZIKV)infection that recognized in northeast Brazil has spread to Latin America(Schuler-Faccini,2016).As of January 2016,there has been confirmed autochthonous transmission of ZIKV in 19 countries in the Americas outside Brazil(Hennessey,2016).
