Aquiet revolution is underway in the vast cotton fields of Bortala Mongolian Autonomous Prefecture in north Xinjiang where harvesting machines,guided by digital sensors,operate with minimal human intervention.Accordin...Aquiet revolution is underway in the vast cotton fields of Bortala Mongolian Autonomous Prefecture in north Xinjiang where harvesting machines,guided by digital sensors,operate with minimal human intervention.According to Aoqierbate,head of the prefecture’s Bureau of Agriculture and Rural Affairs,now hundreds of hectares of cotton can be harvested by just one or two machine operators.展开更多
Generally, Lock and Unlock statements are primitives that should be wholly imple- mented,i.e.,the test of lock state and the operation of locking must be executed continuously without being interrupted. Different f...Generally, Lock and Unlock statements are primitives that should be wholly imple- mented,i.e.,the test of lock state and the operation of locking must be executed continuously without being interrupted. Different from nmormal lock operations, the lock and Unlock algorithm Presented in this paper can be interrupted anywhere by other processes The value of the algorithm in the implementation of concurrent control and mutually-exclusive operations was elucidated with one application of the algorithm in a heterogeneous datedbase united system.展开更多
The parasitic polysulfides shuttle effect greatly hinders the practical application of lithium sulfur batteries,and this issue can be addressed by promoting polysulfides conversion with catalytic materials such as Mo ...The parasitic polysulfides shuttle effect greatly hinders the practical application of lithium sulfur batteries,and this issue can be addressed by promoting polysulfides conversion with catalytic materials such as Mo S_(2).However,the catalytic activity of Mo S_(2)mainly relies on edge sites,but is limited by inert basal planes.We herein report a novel,facile,ethylene glycol enabled competing reduction strategy to dope Mo S_(2)homogeneously with oxygen atoms so that its inert basal planes can be unlocked.Ethylene glycol works as a reducing agent and competes with thiourea to react with ammonium molybdate,leading to insufficient sulfuration of Mo,and consequent formation of O-Mo S_(2).Our theoretical and experimental investigations indicate that the homogeneously distributed O dopants can create abundant adsorption/-catalytic sites in the Mo S_(2)basal planes,enlarge the inter-plane distance to promote ion transport,and thus enhance the catalytic conversion of polysulfides.The oxygen doped Mo S_(2)(O-Mo S_(2))is supported on carbon nanosheets(CNS)and the composite(O-Mo S_(2)/CNS)is employed to modify the separator of Li-S battery.It gives the battery an initial discharge capacity of 1537 m Ah g-1at 0.2 C,and the battery retains a discharge capacity of 545 m Ah g-1after ultra-long 2000 cycles at 1 C,corresponding to a very small cyclic decay rate of 0.0237%.Even under a raising sulfur loading of 8.2 mg cm^(-2),the Li-S battery also delivers a high discharge capacity(554 m Ah g^(-1))with outstanding cycle stability(84.6%capacity retention)after 100 cycles at 0.5 C.Our work provides a novel,facile approach to fabricate highly catalytically active oxygen-doped Mo S_(2)for advanced Li-S batteries.展开更多
<strong>Background:</strong> A large percentage of deaths in an epidemic or pandemic can be due to overshoot of population (herd) immunity, either from the initial peak or from planned or unplanned exit fr...<strong>Background:</strong> A large percentage of deaths in an epidemic or pandemic can be due to overshoot of population (herd) immunity, either from the initial peak or from planned or unplanned exit from lockdown or social distancing conditions. <strong>Objectives:</strong> We study partial unlock or reopening interaction with seasonal effects in a managed epidemic to quantify overshoot effects on small and large unlock steps and discover robust strategies for reducing overshoot. <strong>Methods:</strong> We simulate partial unlock of social distancing for epidemics over a range of replication factor, immunity duration and seasonality factor for strategies targeting immunity thresholds using overshoot optimization. <strong>Results:</strong> Seasonality change must be taken into account as one of the steps in an easing sequence, and a two-step unlock, including seasonal effects, minimizes overshoot and deaths. It may cause undershoot, which causes rebounds and assists survival of the pathogen. <strong>Conclusions:</strong> Partial easing levels, even low levels for economic relief while waiting on a vaccine, have population immunity thresholds based on the reduced replication rates and may experience overshoot as well. We further find a two-step strategy remains highly sensitive to variations in case ratio, replication factor, seasonality and timing. We demonstrate a three or more step strategy is more robust, and conclude that the best possible approach minimizes deaths under a range of likely actual conditions which include public response.展开更多
According to the United Nations,a moderately aging society refers to a country where those aged 65 and above exceed 14%of the total population.Data released by the Ministry of Civil Affairs showed that there were 296....According to the United Nations,a moderately aging society refers to a country where those aged 65 and above exceed 14%of the total population.Data released by the Ministry of Civil Affairs showed that there were 296.97 million people aged 60 and above in China by the end of 2023,accounting for 21.1%of the total population.Among them,216.76 million were aged 65 and above,making up 15.4%of the total population.This indicates that China has officially crossed the threshold into a moderately aging society.展开更多
Independent living and housing stability are core principles of the psychiatric recovery process.Only when basic needs such as safe,affordable and permanent housing are met can individuals with serious mental illnesse...Independent living and housing stability are core principles of the psychiatric recovery process.Only when basic needs such as safe,affordable and permanent housing are met can individuals with serious mental illnesses(SMI)reintegrate into their community,consistently engage with mental health services and begin(or restart)recovery.'Yet,post-discharged individuals with SMI and their psychiatric care providers often grapple with where to go after discharge from psychiatric hospitalisation.This question is particularly central in safety-net hospitals serving people affected by severe health disparities with myriad deficits in social determinants of health(SDoH).In this commentary,we aim to shed light on post-discharge challenges related to housing often encountered by safety-net psychiatric hospitals and propose ways to address them.展开更多
In a study,published online in National Science Review on October 28,researchers led by Dr.LI Jinhua at the Institute of Geology and Geophysics(IGG)of the Chinese Academy of Sciences have used an integrative genomic a...In a study,published online in National Science Review on October 28,researchers led by Dr.LI Jinhua at the Institute of Geology and Geophysics(IGG)of the Chinese Academy of Sciences have used an integrative genomic and phenomic analysis to explore the genetic basis of magnetosome biomineralization in magnetotactic bacteria(MTB).展开更多
Wind power, especially low-wind-speed power, has tremendous development potential in ASEAN countries, which has inspired Chinese enterprises to act ASEAN is among the regions most severely affected by climate change....Wind power, especially low-wind-speed power, has tremendous development potential in ASEAN countries, which has inspired Chinese enterprises to act ASEAN is among the regions most severely affected by climate change. It’s also highly dependent on fossil energy. Developing renewable energy and promoting energy transformation is essential for ASEAN countries to cope with climate change and achieve sustainable economic and social development.展开更多
The summit’s theme reflects the shared aspiration of G20 member states to steer the world economy towards a more sustainable path.A key success of the G20 in the aftermath of the financial crisis has been to signific...The summit’s theme reflects the shared aspiration of G20 member states to steer the world economy towards a more sustainable path.A key success of the G20 in the aftermath of the financial crisis has been to significantly strengthen the resilience of the global financial system.Now we need to focus on ways in展开更多
Around four in a thousand people worldwide suffer from schizophrenia,according to scientific estimates.The disease affects people from all walks of life,including Vincent van Gogh,the painter Agnes Martin,mathematicia...Around four in a thousand people worldwide suffer from schizophrenia,according to scientific estimates.The disease affects people from all walks of life,including Vincent van Gogh,the painter Agnes Martin,mathematician John Nash and Eduard Einstein,a son of the great physicist.展开更多
IN December 2012, as corporate South Africa closed down for the holiday season, more than 4,500 members of the ruling African National Congress （ANC） descended on the city of Mangaung to elect their leadership for t...IN December 2012, as corporate South Africa closed down for the holiday season, more than 4,500 members of the ruling African National Congress （ANC） descended on the city of Mangaung to elect their leadership for the next five years, and ultimately determine the future of South Africa＇s development.展开更多
What secret molecular key enables methamphetamine,or meth for short,to ruthlessly hijack the brain’s reward system,leading countless individuals down spiral paths of addiction?Thanks to innovative research reported t...What secret molecular key enables methamphetamine,or meth for short,to ruthlessly hijack the brain’s reward system,leading countless individuals down spiral paths of addiction?Thanks to innovative research reported this month in Nature,we finally have critical clues.展开更多
The third volume of Xi Jinping:The Governance of China is a continuum of the elucidation of the thoughts,issues and policies that are central to the governance of contemporary China,as articulated in the two earlier v...The third volume of Xi Jinping:The Governance of China is a continuum of the elucidation of the thoughts,issues and policies that are central to the governance of contemporary China,as articulated in the two earlier volumes by Chinese President Xi Jinping,who is also general secretary of the Communist Party of China(CPC)Central Committee.展开更多
The widespread applications of single-cell technologies have generated a large amount of single-cell data,resulting in a growing need for single-cell data analysis and interpretation methods.While methods such as mach...The widespread applications of single-cell technologies have generated a large amount of single-cell data,resulting in a growing need for single-cell data analysis and interpretation methods.While methods such as machine learning allow for single-cell data analysis,they cannot interpret the data very well.展开更多
Investment remains the vital ingredient for Africa’s success WHILE there are meaningful objections to the nature and structure of much of the new investment in African agriculture,it is clear that the introduction of...Investment remains the vital ingredient for Africa’s success WHILE there are meaningful objections to the nature and structure of much of the new investment in African agriculture,it is clear that the introduction of new capital,skills and technology is an essential component in unlocking the continent’s ultimate allure.展开更多
The traditional telecommunications operator of China has entered into a substantive network construction stage of NGN and new VoIP service in 2006. As the increasing understanding and the consideration of cost to VoIP...The traditional telecommunications operator of China has entered into a substantive network construction stage of NGN and new VoIP service in 2006. As the increasing understanding and the consideration of cost to VoIP, VoIP has become more acceptable for CIO of large-scale enterprises. Small and medium-scale enterprises are sensitive to communication cost, but influenced by the maturity of VoIP technology and reduction of VoIP equipment price, the market is intensified. All these drive the VoIP equipment entering into the actual purchase stage and promote the stable growth of VoIP equipment scale.展开更多
In this paper, we have demonstrated an Er-doped ultrafast laser with a single mode fiber-gradient index multimode fiber-single mode fiber(SMF-GIMF-SMF, SMS) structure as saturable absorber(SA), which can generate not ...In this paper, we have demonstrated an Er-doped ultrafast laser with a single mode fiber-gradient index multimode fiber-single mode fiber(SMF-GIMF-SMF, SMS) structure as saturable absorber(SA), which can generate not only stable single-pulse state, but also special mode-locked pulses with the characteristics of high energy and noisy behaviors at proper pump power and cavity polarization state. In addition, we have deeply investigated the real-time spectral evolutions of the mode-locked pulses through the dispersive Fourier transformation(DFT) technique. It can be found that the pulse regime can actually consist of a lot of small noise pulses with randomly varying intensities. We believe that these results will further enrich the nonlinear dynamical processes in the ultrafast lasers.展开更多
Synchronized dual-wavelength mode-locked laser is investigated numerically and experimentally in the normal dispersion regime.A programmable optical processor is introduced to shape the spectral profile and adjust the...Synchronized dual-wavelength mode-locked laser is investigated numerically and experimentally in the normal dispersion regime.A programmable optical processor is introduced to shape the spectral profile and adjust the net dispersion,which is demonstrated be a convenient and reliable approach to generate dual-color solitons.The time-stretch dispersive Fourier transform and frequency-resolved optical grating techniques are utilized to measure the spectral and temporal characteristics of dual-color solitons,respectively.The numerical results are consistent with experimental results.This work may facilitate the development of filter-based mode-locked laser and the understanding of multi-wavelength soliton dynamics.展开更多
文摘Aquiet revolution is underway in the vast cotton fields of Bortala Mongolian Autonomous Prefecture in north Xinjiang where harvesting machines,guided by digital sensors,operate with minimal human intervention.According to Aoqierbate,head of the prefecture’s Bureau of Agriculture and Rural Affairs,now hundreds of hectares of cotton can be harvested by just one or two machine operators.
文摘Generally, Lock and Unlock statements are primitives that should be wholly imple- mented,i.e.,the test of lock state and the operation of locking must be executed continuously without being interrupted. Different from nmormal lock operations, the lock and Unlock algorithm Presented in this paper can be interrupted anywhere by other processes The value of the algorithm in the implementation of concurrent control and mutually-exclusive operations was elucidated with one application of the algorithm in a heterogeneous datedbase united system.
基金financial support from the fund for Creative Research Groups of the National Natural Science Foundation of China(22021005)the Science and Technology Innovation Fund of Dalian(2018J12GX052)+3 种基金the National Natural Science Foundation of China(21776042,22108027)the Fundamental Research Funds for the Central Universities of China(DUT19ZD214)the Shenzhen Science and Technology Program(201908163000519)the GDSTC-Key R&D Project(GDSTC No.2019B090908001)。
文摘The parasitic polysulfides shuttle effect greatly hinders the practical application of lithium sulfur batteries,and this issue can be addressed by promoting polysulfides conversion with catalytic materials such as Mo S_(2).However,the catalytic activity of Mo S_(2)mainly relies on edge sites,but is limited by inert basal planes.We herein report a novel,facile,ethylene glycol enabled competing reduction strategy to dope Mo S_(2)homogeneously with oxygen atoms so that its inert basal planes can be unlocked.Ethylene glycol works as a reducing agent and competes with thiourea to react with ammonium molybdate,leading to insufficient sulfuration of Mo,and consequent formation of O-Mo S_(2).Our theoretical and experimental investigations indicate that the homogeneously distributed O dopants can create abundant adsorption/-catalytic sites in the Mo S_(2)basal planes,enlarge the inter-plane distance to promote ion transport,and thus enhance the catalytic conversion of polysulfides.The oxygen doped Mo S_(2)(O-Mo S_(2))is supported on carbon nanosheets(CNS)and the composite(O-Mo S_(2)/CNS)is employed to modify the separator of Li-S battery.It gives the battery an initial discharge capacity of 1537 m Ah g-1at 0.2 C,and the battery retains a discharge capacity of 545 m Ah g-1after ultra-long 2000 cycles at 1 C,corresponding to a very small cyclic decay rate of 0.0237%.Even under a raising sulfur loading of 8.2 mg cm^(-2),the Li-S battery also delivers a high discharge capacity(554 m Ah g^(-1))with outstanding cycle stability(84.6%capacity retention)after 100 cycles at 0.5 C.Our work provides a novel,facile approach to fabricate highly catalytically active oxygen-doped Mo S_(2)for advanced Li-S batteries.
文摘<strong>Background:</strong> A large percentage of deaths in an epidemic or pandemic can be due to overshoot of population (herd) immunity, either from the initial peak or from planned or unplanned exit from lockdown or social distancing conditions. <strong>Objectives:</strong> We study partial unlock or reopening interaction with seasonal effects in a managed epidemic to quantify overshoot effects on small and large unlock steps and discover robust strategies for reducing overshoot. <strong>Methods:</strong> We simulate partial unlock of social distancing for epidemics over a range of replication factor, immunity duration and seasonality factor for strategies targeting immunity thresholds using overshoot optimization. <strong>Results:</strong> Seasonality change must be taken into account as one of the steps in an easing sequence, and a two-step unlock, including seasonal effects, minimizes overshoot and deaths. It may cause undershoot, which causes rebounds and assists survival of the pathogen. <strong>Conclusions:</strong> Partial easing levels, even low levels for economic relief while waiting on a vaccine, have population immunity thresholds based on the reduced replication rates and may experience overshoot as well. We further find a two-step strategy remains highly sensitive to variations in case ratio, replication factor, seasonality and timing. We demonstrate a three or more step strategy is more robust, and conclude that the best possible approach minimizes deaths under a range of likely actual conditions which include public response.
文摘According to the United Nations,a moderately aging society refers to a country where those aged 65 and above exceed 14%of the total population.Data released by the Ministry of Civil Affairs showed that there were 296.97 million people aged 60 and above in China by the end of 2023,accounting for 21.1%of the total population.Among them,216.76 million were aged 65 and above,making up 15.4%of the total population.This indicates that China has officially crossed the threshold into a moderately aging society.
文摘Independent living and housing stability are core principles of the psychiatric recovery process.Only when basic needs such as safe,affordable and permanent housing are met can individuals with serious mental illnesses(SMI)reintegrate into their community,consistently engage with mental health services and begin(or restart)recovery.'Yet,post-discharged individuals with SMI and their psychiatric care providers often grapple with where to go after discharge from psychiatric hospitalisation.This question is particularly central in safety-net hospitals serving people affected by severe health disparities with myriad deficits in social determinants of health(SDoH).In this commentary,we aim to shed light on post-discharge challenges related to housing often encountered by safety-net psychiatric hospitals and propose ways to address them.
文摘In a study,published online in National Science Review on October 28,researchers led by Dr.LI Jinhua at the Institute of Geology and Geophysics(IGG)of the Chinese Academy of Sciences have used an integrative genomic and phenomic analysis to explore the genetic basis of magnetosome biomineralization in magnetotactic bacteria(MTB).
文摘Wind power, especially low-wind-speed power, has tremendous development potential in ASEAN countries, which has inspired Chinese enterprises to act ASEAN is among the regions most severely affected by climate change. It’s also highly dependent on fossil energy. Developing renewable energy and promoting energy transformation is essential for ASEAN countries to cope with climate change and achieve sustainable economic and social development.
文摘The summit’s theme reflects the shared aspiration of G20 member states to steer the world economy towards a more sustainable path.A key success of the G20 in the aftermath of the financial crisis has been to significantly strengthen the resilience of the global financial system.Now we need to focus on ways in
文摘Around four in a thousand people worldwide suffer from schizophrenia,according to scientific estimates.The disease affects people from all walks of life,including Vincent van Gogh,the painter Agnes Martin,mathematician John Nash and Eduard Einstein,a son of the great physicist.
文摘IN December 2012, as corporate South Africa closed down for the holiday season, more than 4,500 members of the ruling African National Congress （ANC） descended on the city of Mangaung to elect their leadership for the next five years, and ultimately determine the future of South Africa＇s development.
文摘What secret molecular key enables methamphetamine,or meth for short,to ruthlessly hijack the brain’s reward system,leading countless individuals down spiral paths of addiction?Thanks to innovative research reported this month in Nature,we finally have critical clues.
文摘The third volume of Xi Jinping:The Governance of China is a continuum of the elucidation of the thoughts,issues and policies that are central to the governance of contemporary China,as articulated in the two earlier volumes by Chinese President Xi Jinping,who is also general secretary of the Communist Party of China(CPC)Central Committee.
文摘The widespread applications of single-cell technologies have generated a large amount of single-cell data,resulting in a growing need for single-cell data analysis and interpretation methods.While methods such as machine learning allow for single-cell data analysis,they cannot interpret the data very well.
文摘Investment remains the vital ingredient for Africa’s success WHILE there are meaningful objections to the nature and structure of much of the new investment in African agriculture,it is clear that the introduction of new capital,skills and technology is an essential component in unlocking the continent’s ultimate allure.
文摘The traditional telecommunications operator of China has entered into a substantive network construction stage of NGN and new VoIP service in 2006. As the increasing understanding and the consideration of cost to VoIP, VoIP has become more acceptable for CIO of large-scale enterprises. Small and medium-scale enterprises are sensitive to communication cost, but influenced by the maturity of VoIP technology and reduction of VoIP equipment price, the market is intensified. All these drive the VoIP equipment entering into the actual purchase stage and promote the stable growth of VoIP equipment scale.
基金supported by the Guangdong Basic and Applied Basic Research Foundation (No.2023A1515010093)the Shenzhen Fundamental Research Program (Stable Support Plan Program)(Nos.JCYJ20220809170611004, 20231121110828001 and 20231121113641002)the National Taipei University of Technology-Shenzhen University Joint Research Program (No.2024001)。
文摘In this paper, we have demonstrated an Er-doped ultrafast laser with a single mode fiber-gradient index multimode fiber-single mode fiber(SMF-GIMF-SMF, SMS) structure as saturable absorber(SA), which can generate not only stable single-pulse state, but also special mode-locked pulses with the characteristics of high energy and noisy behaviors at proper pump power and cavity polarization state. In addition, we have deeply investigated the real-time spectral evolutions of the mode-locked pulses through the dispersive Fourier transformation(DFT) technique. It can be found that the pulse regime can actually consist of a lot of small noise pulses with randomly varying intensities. We believe that these results will further enrich the nonlinear dynamical processes in the ultrafast lasers.
基金Project supported by the Innovation Program for Quantum Science and Technology(Grant No.2023ZD0301000)the National Natural Science Foundation of China(Grant Nos.12434018,62475073,1243000542,11621404,11561121003,11727812,61775059,12074122,62405090,62035005,and 11704123)+1 种基金the Natural Science Foundation of Shanghai(Grant No.23ZR1419000)China Postdoctoral Science Foundation(Grant Nos.2023M741188 and 2024T170275)。
文摘Synchronized dual-wavelength mode-locked laser is investigated numerically and experimentally in the normal dispersion regime.A programmable optical processor is introduced to shape the spectral profile and adjust the net dispersion,which is demonstrated be a convenient and reliable approach to generate dual-color solitons.The time-stretch dispersive Fourier transform and frequency-resolved optical grating techniques are utilized to measure the spectral and temporal characteristics of dual-color solitons,respectively.The numerical results are consistent with experimental results.This work may facilitate the development of filter-based mode-locked laser and the understanding of multi-wavelength soliton dynamics.
