Using gradually regression analysis to establish the driving force model of utilized change of cultivated land in Gonghe County, and using path analysis, correlation analysis, partial correlation analysis and system d...Using gradually regression analysis to establish the driving force model of utilized change of cultivated land in Gonghe County, and using path analysis, correlation analysis, partial correlation analysis and system dynamics method to inspect the effect of driving changing on cultivated land change under different change situations. Driving factors, action mechanism and process of utilized change of cultivated land were analyzed from the county territory scale level. At last, some corresponding policies and measures were put forward.展开更多
Using path analysis, correlation analysis, partial correlation analysis and system dynamics method to study the driving force of cultivated land in Qinghai Lake Area, and using gradually regression analysis to establi...Using path analysis, correlation analysis, partial correlation analysis and system dynamics method to study the driving force of cultivated land in Qinghai Lake Area, and using gradually regression analysis to establish the driving force model of utilized change of cultivated land. Driving factors, action mechanism and process of utilized change of cultivated land were analyzed, and the differences during all factors were compared. The study provides some decision basis for sustainable utilization and management of land resources in Qinghai Lake Area.展开更多
report the circulation of a novel MERS-like coronavirus in Malayan pangolins, named Manis javanica HKU4-relatedcoronavirus (MjHKU4r-CoV). Among 86 animals, four tested positive by pan-CoV PCR, and seven tested seropos...report the circulation of a novel MERS-like coronavirus in Malayan pangolins, named Manis javanica HKU4-relatedcoronavirus (MjHKU4r-CoV). Among 86 animals, four tested positive by pan-CoV PCR, and seven tested seropositive (11 and12.8%). Four nearly identical (99.9%) genome sequences were obtained, and one virus was isolated (MjHKU4r-CoV-1). Thisvirus utilizes human dipeptidyl peptidase-4 (hDPP4) as a receptor and host proteases for cell infection, which is enhanced by afurin cleavage site that is absent in all known bat HKU4r-CoVs. The MjHKU4r-CoV-1 spike shows higher binding affinity forhDPP4, and MjHKU4r-CoV-1 has a wider host range than bat HKU4-CoV. MjHKU4r-CoV-1 is infectious and pathogenic inhuman airways and intestinal organs and in hDPP4-transgenic mice. Our study highlights the importance of pangolins as reservoirhosts of coronaviruses poised for human disease emergence.展开更多
The yield potential of current rice varieties has reached a high plateau and fluc-tuated within a narrow range. Based on the theory and practice of rice breedingfor super-high-yield, we put forward a concept of "...The yield potential of current rice varieties has reached a high plateau and fluc-tuated within a narrow range. Based on the theory and practice of rice breedingfor super-high-yield, we put forward a concept of " Two high and one early",which means high biomass and high efficiency of light energy conversion, as wellas fast growing in the early growth stage. The agronomic characters of 15 U. S展开更多
In 2022,China’ s actual utilized foreign capital reached a historical high.According to the data released by the State Council Information Office,China’s actual use of foreign capital continued to increase in 2022,r...In 2022,China’ s actual utilized foreign capital reached a historical high.According to the data released by the State Council Information Office,China’s actual use of foreign capital continued to increase in 2022,reaching RMB 1.2trillion,which is a new high historically.展开更多
In China, 10 ethnic minorities with a combined population of over 20 million people are followers of Islam. In Ningxia Hui Autonomous Region, the population is nearly 6 million, a-mong which the Islamic population is ...In China, 10 ethnic minorities with a combined population of over 20 million people are followers of Islam. In Ningxia Hui Autonomous Region, the population is nearly 6 million, a-mong which the Islamic population is about 2 million. In China as a whole, more than 20 million people enjoy eating food prepared according to Islamic guidelines, known as hal'al food.展开更多
It is unknown whether pangolins,the most trafficked mammals,play a role in the zoonotic transmission of bat coronaviruses.We report the circulation of a novel MERS-like coronavirus in Malayan pangolins,named Manis jav...It is unknown whether pangolins,the most trafficked mammals,play a role in the zoonotic transmission of bat coronaviruses.We report the circulation of a novel MERS-like coronavirus in Malayan pangolins,named Manis javanica HKU4-related coronavirus(MjHKU4r-CoV).Among 86 animals,four tested positive by pan-CoV PCR,and seven tested seropositive(11 and 12.8%).展开更多
Equilibrium moisture contents (EMC) of wood species are very necessary in the utilization of these in service. This study investigated the EMC of five lesser utilized species of Ghana and compared it with that of thre...Equilibrium moisture contents (EMC) of wood species are very necessary in the utilization of these in service. This study investigated the EMC of five lesser utilized species of Ghana and compared it with that of three European species. Sixteen randomly sampled specimens of each of the eight species (heartwood and sapwood) with dimensions 3 cm × 3 cm × 3 cm were exposed at various relative humidity conditions of 30%, 45%, 60%, 75% and 90% in a temperature and humidity-controlled climate chamber at a temperature of 25°C in accordance to German standard DIN 52182. The species are Albies alba, Fagus sylvatica and Picea abies which are European species and Amphimas pterocarpoides, Antiaris toxicaria, Canarium schweinfurthii, Celtis zenkeri and Cola gigantea are wood species from Ghana. Internal wood temperature and humidity were measured with datalogger. Samples were considered to have reached equilibrium at any given humidity when the daily weight changes were less than 0.1 mg according to German standard DIN 52183. After the last measurements of the weight changes, the samples were dried at 103°C until there was a constant weight. The five tropical hardwoods had low sorption values recorded and high sorption values for the European species and this could be attributed to differences in the microstructure of these woods.展开更多
1.Introduction As the central organelle in the eukaryotic secretory pathway,the endoplasmic reticulum(ER)mediates cellular processes that include calcium homeostasis and protein processing[1,2].The infection of plants...1.Introduction As the central organelle in the eukaryotic secretory pathway,the endoplasmic reticulum(ER)mediates cellular processes that include calcium homeostasis and protein processing[1,2].The infection of plants by pathogens can induce ER stress and trigger the unfolded protein response(UPR).The UPR is a conserved protective signaling pathway that leads to programmed cell death(PCD)under extreme conditions[3–5],which can harm or benefit pathogens,depending on the timing and mode of cell death,and on whether the pathogen has physiologically adapted to benefit from the dying tissue[6].The biosynthesis and proper function of plant pattern recognition receptors(PRRs),which perceive pathogen-or microbe-associated molecular patterns(PAMPs or MAMPs)at the cell surface,also rely on N-glycosylation and the ER quality-control(ERQC)system[7–9].However,pathogens have evolved the capacity utilizing effectors to bind to the host ER stress pathway and manipulate it to their advantage during infection.展开更多
This paper aims to explore comprehensive utilization way of discarded fresh tobacco leaf. Based on modern tobacco demands on green,environmental protection and sustainable development,as well as actual situation of bi...This paper aims to explore comprehensive utilization way of discarded fresh tobacco leaf. Based on modern tobacco demands on green,environmental protection and sustainable development,as well as actual situation of biogas production facility in some villages of local tobacco area,this paper selects Longwan Village of Fengshiyan Town as the experimental site and explores the rational way of discarded fresh tobacco leaf biogas fermentation. Results show that cutting and fermentation of discarded fresh tobacco leaf before adding into biogas digester is conductive to improving p H in fermentation process,reducing crust amount,and effectively improving biogas production amount and rate. The study can provide reference for effective processing and rational utilization of discarded fresh tobacco leaf.展开更多
The Ni/SBA-15 catalysts were synthesized using the in situ method and the influence of crystallization temperature on nickel utilization efficiency-a critical factor in mesoporous material design-was systematically in...The Ni/SBA-15 catalysts were synthesized using the in situ method and the influence of crystallization temperature on nickel utilization efficiency-a critical factor in mesoporous material design-was systematically investigated.The structural characteristics and nickel anchoring capacity were analyzed using XRD,BET,FT-IR,H2-TPR,and ICP-OES.The results demonstrated that the crystallization temperature significantly affected the framework order of SBA-15 and the surface anchoring efficiency of Ni ions.The nickel utilization efficiency increased from 8.4%at 80℃ to 60.49%at 140℃,but then decreased to 47.25%at 160℃,indicating an optimal crystallization temperature window.This provides crucial guidance for tailoring high-performance metal-doped molecular sieves.The optimal catalyst exhibited excellent performance in the hydrogenation of 1,4-butynediol(BYD):the BYD conversion reached 97.25%with 88.99%selectivity of 1,4-butenediol(BED)within 5 h,and reached 99.73%with 87.34%selectivity of 1,4-butanediol(BDO)after 20 h reaction.These results revealed the critical role of crystallization temperature in metal utilization and provided theoretical support for designing highly active molecular sieve catalysts.展开更多
A batch of important national standards for CCUS released.Recently,State Administration for Market Regulation(SAMR)and National Standardization Administration of China(SAC)released 12 national standards for carbon cap...A batch of important national standards for CCUS released.Recently,State Administration for Market Regulation(SAMR)and National Standardization Administration of China(SAC)released 12 national standards for carbon capture,utilization and storage(CCUS),which will come into effect on July 1,2026.展开更多
Biodiversity constitutes the fundamental cornerstone of ecosystem stability and resilience,furnishing indispensable services that encompass food production,the provision of clean water,climate regulation and the contr...Biodiversity constitutes the fundamental cornerstone of ecosystem stability and resilience,furnishing indispensable services that encompass food production,the provision of clean water,climate regulation and the control of disease.Nonetheless,the planet is currently experiencing an unprecedented biodiversity crisis.展开更多
Among the “three data rights,” the data utilization right has been persistently overlooked, and is similar to a neglected “middle child” in the context of the data rights family. However, it is precisely during th...Among the “three data rights,” the data utilization right has been persistently overlooked, and is similar to a neglected “middle child” in the context of the data rights family. However, it is precisely during the stages of processing and utilization that data undergoes its transformations and where its economic value is ultimately created. A series of recent policy documents on treating data as a factor of production have emphasized that the building of a scientific data property rights system requires a fair and efficient mechanism for benefit distribution, which provides reasonable preference for creators of data value and use value in terms of the income generated by data elements. Constrained by the inertial thinking of property right logic, the data utilization right is often regarded as a “transitional fulcrum” wherein the holders of data resources have to authorize the operators of data products to realize data value thereby. In the future structural design and implementation of the coordination mechanism for the property right system against the backdrop of the data factor-oriented reform, the establishment of data processing and utilization as an independent right will require the implementation of two core initiatives: first, attaching importance to the independent protection of the benefit distribution;second, implementing risk regulation for data security through optimization of governance. These two initiatives will serve as the key for optimizing the data factor governance system and accelerating the release of data value.展开更多
Targeting Chang'E-8 mission'in-situ resource utilization(ISRU)for sustainable lunar habitats,laser powder bed fusion(LPBF)provides a viable pathway for in-situ additive manufacturing of lunar regolith.To eluci...Targeting Chang'E-8 mission'in-situ resource utilization(ISRU)for sustainable lunar habitats,laser powder bed fusion(LPBF)provides a viable pathway for in-situ additive manufacturing of lunar regolith.To elucidate mission relevant mechanical behavior and failure mechanisms of LPBF fabricated lunar regolith simulants,mare type and highland type simulant specimens were produced.Microstructural characterization,mechanical test coupled with three-dimensional digital image correlation(3D-DIC),and an energy-dissipation framework were employed for comprehensive analysis.The pristine highland specimens achieved 5.79 MPa and a peak strain of 0.13(50 mm×50 mm×30 mm),significantly outperforming their mare counterparts.Wire-cutting to 20 mm×20 mm×20 mm lowered strength by~20%and peak strain to 0.04,indicating cutting-induced defects reduce ductility.All specimens displayed multipeaked stress–strain curves.3D-DIC revealed band-type strain localization in pristine highland samples,diffuse strain patterns in cut highland samples,and highly tortuous,network-type bands in mare samples;the anisotropy index was also quantified.Fragmented particles exhibited fractal dimensions ranging from 1.6 to 2.0(size 1.25–9 mm).Energy evolution progressed through three distinct stages:elastic energy storage,progressive energy dissipation delaying crack propagation,and final unstable collapse.An energy-based damage model was established and validated.The data and methods developed support Chang'E-8 missions'ISRU demonstrations and establish a transferable framework toward sustainable lunar habitats.展开更多
Risk-Based Management Consensus Guidelines have been published in 2020 in the United States(US)by the American Society for Colposcopy and Clinical Pathology(ASCCP)^(1-3).These US guidelines evolved from earlier 2012 g...Risk-Based Management Consensus Guidelines have been published in 2020 in the United States(US)by the American Society for Colposcopy and Clinical Pathology(ASCCP)^(1-3).These US guidelines evolved from earlier 2012 guidelines^(4)which were the first to be based on the principle of“equal management for equal risk.”This referred specifically to the risk of a patient developing invasive cervical cancer,“estimated by the surrogate end-point of the 5-year-risk of cervical intraepithelial neoplasia(CIN)grade 3(CIN3)or more severe diagnoses(CIN3+)”^(1).Still more recently released American Cancer Society(ACS)Guidelines for Cervical Cancer Screening-2020 similarly use CIN3 and CIN3+as the“best surrogate measure of incident cervical cancer risk,”given the absence of US clinical trial data sufficiently powered to evaluate cervical cancer risk^(5).We have argued that neither CIN3 nor CIN3+are equivalent and reliable surrogate end-points for invasive cervical cancer risk.This means that cervical screening guidelines based on these surrogate risk end-points could prove to be significantly misleading^(6).展开更多
Stabilizing the Zn anode under high utilization rates is highly applauded yet very challenging in aqueous Zn batteries.Here,we rationally design a zincophilic short-chain aromatic molecule,4-mercaptopyridine(4Mpy),to ...Stabilizing the Zn anode under high utilization rates is highly applauded yet very challenging in aqueous Zn batteries.Here,we rationally design a zincophilic short-chain aromatic molecule,4-mercaptopyridine(4Mpy),to construct self-assembled monolayers(SAMs)on a copper substrate to achieve highly utilized Zn anodes.We reveal that 4Mpy could be firmly bound on the Cu substrate via Cu–S bond to form compact and uniform SAMs,which could effectively isolate the water on the electrode surface and thus eliminate the water-related side reactions.In addition,the short-chain aromatic ring structure of 4Mpy could not only ensure the ordered arrangement of zincophilic pyridine N but also facilitate charge transfer,thus enabling uniform and rapid Zn deposition.Consequently,the Zn/4Mpy/Cu electrode not only enables the symmetric cell to stably cycle for over 180 h at 10 mA cm^(-2) under a high depth-of-discharge of 90%,but also allows the MnO_(2)-paired pouch cell to survive for 100 cycles under a high Zn utilization rate of 78.8%.An anode-free 4Mpy/Cu||graphite cell also operates for 150 cycles without obvious capacity fading at 0.1 A g^(-1).This control of interfacial chemistry via SAMs to achieve high utilization rates of metal anodes provides a new paradigm for developing high-energy metal-based batteries.展开更多
About this issue:Radar astronomy is a science that utilizes radar electromagnetic waves to study celestial bodies within and beyond the solar system,focusing mainly on planets,satellites and small bodies such as the M...About this issue:Radar astronomy is a science that utilizes radar electromagnetic waves to study celestial bodies within and beyond the solar system,focusing mainly on planets,satellites and small bodies such as the Moon,Mars,Venus and Saturn.Through radar electromagnetic wave detection,we are able to gain an in-depth understanding of these celestial bodies'internal structures,composition,distribution of water resources,magnetic fields,atmospheres,and other physical properties.This is of great significance for human beings to find a habitable environment in the solar system.At present,the observation methods of radar astronomy mainly rely on ground-based radio telescopes that actively emit electromagnetic waves.展开更多
Photonic crystal surface emitting lasers(PCSELs)utilize the Bragg diffraction of two-dimensional photonic crystals to achieve a single-mode output with a high power and a small divergence angle,and has recently attrac...Photonic crystal surface emitting lasers(PCSELs)utilize the Bragg diffraction of two-dimensional photonic crystals to achieve a single-mode output with a high power and a small divergence angle,and has recently attracted much attention^([1−3]).In 2023,Kyoto University reported GaAs-based 945 nm PCSELs with a continuous-wave(CW)single-mode output power of exceeding 50 W,and a narrow beam divergence angle of 0.05°,demonstrating a brightness of 1 GW·cm^(−2)·sr^(−1),which rivals those of the existing bulky lasers^([4]).展开更多
基金Supported by the National Social Science Fund(06XMZ014)~~
文摘Using gradually regression analysis to establish the driving force model of utilized change of cultivated land in Gonghe County, and using path analysis, correlation analysis, partial correlation analysis and system dynamics method to inspect the effect of driving changing on cultivated land change under different change situations. Driving factors, action mechanism and process of utilized change of cultivated land were analyzed from the county territory scale level. At last, some corresponding policies and measures were put forward.
基金Supported by The Regional Sustainable Development of the Qing-TibetPlateau(2004)~~
文摘Using path analysis, correlation analysis, partial correlation analysis and system dynamics method to study the driving force of cultivated land in Qinghai Lake Area, and using gradually regression analysis to establish the driving force model of utilized change of cultivated land. Driving factors, action mechanism and process of utilized change of cultivated land were analyzed, and the differences during all factors were compared. The study provides some decision basis for sustainable utilization and management of land resources in Qinghai Lake Area.
文摘report the circulation of a novel MERS-like coronavirus in Malayan pangolins, named Manis javanica HKU4-relatedcoronavirus (MjHKU4r-CoV). Among 86 animals, four tested positive by pan-CoV PCR, and seven tested seropositive (11 and12.8%). Four nearly identical (99.9%) genome sequences were obtained, and one virus was isolated (MjHKU4r-CoV-1). Thisvirus utilizes human dipeptidyl peptidase-4 (hDPP4) as a receptor and host proteases for cell infection, which is enhanced by afurin cleavage site that is absent in all known bat HKU4r-CoVs. The MjHKU4r-CoV-1 spike shows higher binding affinity forhDPP4, and MjHKU4r-CoV-1 has a wider host range than bat HKU4-CoV. MjHKU4r-CoV-1 is infectious and pathogenic inhuman airways and intestinal organs and in hDPP4-transgenic mice. Our study highlights the importance of pangolins as reservoirhosts of coronaviruses poised for human disease emergence.
文摘The yield potential of current rice varieties has reached a high plateau and fluc-tuated within a narrow range. Based on the theory and practice of rice breedingfor super-high-yield, we put forward a concept of " Two high and one early",which means high biomass and high efficiency of light energy conversion, as wellas fast growing in the early growth stage. The agronomic characters of 15 U. S
文摘In 2022,China’ s actual utilized foreign capital reached a historical high.According to the data released by the State Council Information Office,China’s actual use of foreign capital continued to increase in 2022,reaching RMB 1.2trillion,which is a new high historically.
文摘In China, 10 ethnic minorities with a combined population of over 20 million people are followers of Islam. In Ningxia Hui Autonomous Region, the population is nearly 6 million, a-mong which the Islamic population is about 2 million. In China as a whole, more than 20 million people enjoy eating food prepared according to Islamic guidelines, known as hal'al food.
文摘It is unknown whether pangolins,the most trafficked mammals,play a role in the zoonotic transmission of bat coronaviruses.We report the circulation of a novel MERS-like coronavirus in Malayan pangolins,named Manis javanica HKU4-related coronavirus(MjHKU4r-CoV).Among 86 animals,four tested positive by pan-CoV PCR,and seven tested seropositive(11 and 12.8%).
文摘Equilibrium moisture contents (EMC) of wood species are very necessary in the utilization of these in service. This study investigated the EMC of five lesser utilized species of Ghana and compared it with that of three European species. Sixteen randomly sampled specimens of each of the eight species (heartwood and sapwood) with dimensions 3 cm × 3 cm × 3 cm were exposed at various relative humidity conditions of 30%, 45%, 60%, 75% and 90% in a temperature and humidity-controlled climate chamber at a temperature of 25°C in accordance to German standard DIN 52182. The species are Albies alba, Fagus sylvatica and Picea abies which are European species and Amphimas pterocarpoides, Antiaris toxicaria, Canarium schweinfurthii, Celtis zenkeri and Cola gigantea are wood species from Ghana. Internal wood temperature and humidity were measured with datalogger. Samples were considered to have reached equilibrium at any given humidity when the daily weight changes were less than 0.1 mg according to German standard DIN 52183. After the last measurements of the weight changes, the samples were dried at 103°C until there was a constant weight. The five tropical hardwoods had low sorption values recorded and high sorption values for the European species and this could be attributed to differences in the microstructure of these woods.
基金This work was supported by the National Natural Science Foundation of China(31430073,31721004,and 31801715)the Natural Science Foundation of Jiangsu Province,China(BK20180518)the Fundamental Research Funds for the Central Universities,China(KJQN201913).
文摘1.Introduction As the central organelle in the eukaryotic secretory pathway,the endoplasmic reticulum(ER)mediates cellular processes that include calcium homeostasis and protein processing[1,2].The infection of plants by pathogens can induce ER stress and trigger the unfolded protein response(UPR).The UPR is a conserved protective signaling pathway that leads to programmed cell death(PCD)under extreme conditions[3–5],which can harm or benefit pathogens,depending on the timing and mode of cell death,and on whether the pathogen has physiologically adapted to benefit from the dying tissue[6].The biosynthesis and proper function of plant pattern recognition receptors(PRRs),which perceive pathogen-or microbe-associated molecular patterns(PAMPs or MAMPs)at the cell surface,also rely on N-glycosylation and the ER quality-control(ERQC)system[7–9].However,pathogens have evolved the capacity utilizing effectors to bind to the host ER stress pathway and manipulate it to their advantage during infection.
文摘This paper aims to explore comprehensive utilization way of discarded fresh tobacco leaf. Based on modern tobacco demands on green,environmental protection and sustainable development,as well as actual situation of biogas production facility in some villages of local tobacco area,this paper selects Longwan Village of Fengshiyan Town as the experimental site and explores the rational way of discarded fresh tobacco leaf biogas fermentation. Results show that cutting and fermentation of discarded fresh tobacco leaf before adding into biogas digester is conductive to improving p H in fermentation process,reducing crust amount,and effectively improving biogas production amount and rate. The study can provide reference for effective processing and rational utilization of discarded fresh tobacco leaf.
文摘The Ni/SBA-15 catalysts were synthesized using the in situ method and the influence of crystallization temperature on nickel utilization efficiency-a critical factor in mesoporous material design-was systematically investigated.The structural characteristics and nickel anchoring capacity were analyzed using XRD,BET,FT-IR,H2-TPR,and ICP-OES.The results demonstrated that the crystallization temperature significantly affected the framework order of SBA-15 and the surface anchoring efficiency of Ni ions.The nickel utilization efficiency increased from 8.4%at 80℃ to 60.49%at 140℃,but then decreased to 47.25%at 160℃,indicating an optimal crystallization temperature window.This provides crucial guidance for tailoring high-performance metal-doped molecular sieves.The optimal catalyst exhibited excellent performance in the hydrogenation of 1,4-butynediol(BYD):the BYD conversion reached 97.25%with 88.99%selectivity of 1,4-butenediol(BED)within 5 h,and reached 99.73%with 87.34%selectivity of 1,4-butanediol(BDO)after 20 h reaction.These results revealed the critical role of crystallization temperature in metal utilization and provided theoretical support for designing highly active molecular sieve catalysts.
文摘A batch of important national standards for CCUS released.Recently,State Administration for Market Regulation(SAMR)and National Standardization Administration of China(SAC)released 12 national standards for carbon capture,utilization and storage(CCUS),which will come into effect on July 1,2026.
基金supported by the Guangdong Basic and Applied Basic Research Foundation-Special Program on Biodiversity(2023B0303050001).
文摘Biodiversity constitutes the fundamental cornerstone of ecosystem stability and resilience,furnishing indispensable services that encompass food production,the provision of clean water,climate regulation and the control of disease.Nonetheless,the planet is currently experiencing an unprecedented biodiversity crisis.
文摘Among the “three data rights,” the data utilization right has been persistently overlooked, and is similar to a neglected “middle child” in the context of the data rights family. However, it is precisely during the stages of processing and utilization that data undergoes its transformations and where its economic value is ultimately created. A series of recent policy documents on treating data as a factor of production have emphasized that the building of a scientific data property rights system requires a fair and efficient mechanism for benefit distribution, which provides reasonable preference for creators of data value and use value in terms of the income generated by data elements. Constrained by the inertial thinking of property right logic, the data utilization right is often regarded as a “transitional fulcrum” wherein the holders of data resources have to authorize the operators of data products to realize data value thereby. In the future structural design and implementation of the coordination mechanism for the property right system against the backdrop of the data factor-oriented reform, the establishment of data processing and utilization as an independent right will require the implementation of two core initiatives: first, attaching importance to the independent protection of the benefit distribution;second, implementing risk regulation for data security through optimization of governance. These two initiatives will serve as the key for optimizing the data factor governance system and accelerating the release of data value.
基金supported by the Young Student Project of National Natural Science Foundation of China(No.525B2139)the National Key Research and Development Program of China(Nos.2023YFB3711300 and 2021YFF0500301)the Space Application System of China Manned Space Program(No.KJZ-YYWCL404)。
文摘Targeting Chang'E-8 mission'in-situ resource utilization(ISRU)for sustainable lunar habitats,laser powder bed fusion(LPBF)provides a viable pathway for in-situ additive manufacturing of lunar regolith.To elucidate mission relevant mechanical behavior and failure mechanisms of LPBF fabricated lunar regolith simulants,mare type and highland type simulant specimens were produced.Microstructural characterization,mechanical test coupled with three-dimensional digital image correlation(3D-DIC),and an energy-dissipation framework were employed for comprehensive analysis.The pristine highland specimens achieved 5.79 MPa and a peak strain of 0.13(50 mm×50 mm×30 mm),significantly outperforming their mare counterparts.Wire-cutting to 20 mm×20 mm×20 mm lowered strength by~20%and peak strain to 0.04,indicating cutting-induced defects reduce ductility.All specimens displayed multipeaked stress–strain curves.3D-DIC revealed band-type strain localization in pristine highland samples,diffuse strain patterns in cut highland samples,and highly tortuous,network-type bands in mare samples;the anisotropy index was also quantified.Fragmented particles exhibited fractal dimensions ranging from 1.6 to 2.0(size 1.25–9 mm).Energy evolution progressed through three distinct stages:elastic energy storage,progressive energy dissipation delaying crack propagation,and final unstable collapse.An energy-based damage model was established and validated.The data and methods developed support Chang'E-8 missions'ISRU demonstrations and establish a transferable framework toward sustainable lunar habitats.
文摘Risk-Based Management Consensus Guidelines have been published in 2020 in the United States(US)by the American Society for Colposcopy and Clinical Pathology(ASCCP)^(1-3).These US guidelines evolved from earlier 2012 guidelines^(4)which were the first to be based on the principle of“equal management for equal risk.”This referred specifically to the risk of a patient developing invasive cervical cancer,“estimated by the surrogate end-point of the 5-year-risk of cervical intraepithelial neoplasia(CIN)grade 3(CIN3)or more severe diagnoses(CIN3+)”^(1).Still more recently released American Cancer Society(ACS)Guidelines for Cervical Cancer Screening-2020 similarly use CIN3 and CIN3+as the“best surrogate measure of incident cervical cancer risk,”given the absence of US clinical trial data sufficiently powered to evaluate cervical cancer risk^(5).We have argued that neither CIN3 nor CIN3+are equivalent and reliable surrogate end-points for invasive cervical cancer risk.This means that cervical screening guidelines based on these surrogate risk end-points could prove to be significantly misleading^(6).
基金supported by the National Natural Science Foundation of China(22379041,52103313)National Key Research and Development Program of China(2022YFB2402400)+1 种基金The Science and Technology Innovation Program of Hunan Province(2023RC1045)Natural Science Foundation of Hunan Province(2021JJ30094).
文摘Stabilizing the Zn anode under high utilization rates is highly applauded yet very challenging in aqueous Zn batteries.Here,we rationally design a zincophilic short-chain aromatic molecule,4-mercaptopyridine(4Mpy),to construct self-assembled monolayers(SAMs)on a copper substrate to achieve highly utilized Zn anodes.We reveal that 4Mpy could be firmly bound on the Cu substrate via Cu–S bond to form compact and uniform SAMs,which could effectively isolate the water on the electrode surface and thus eliminate the water-related side reactions.In addition,the short-chain aromatic ring structure of 4Mpy could not only ensure the ordered arrangement of zincophilic pyridine N but also facilitate charge transfer,thus enabling uniform and rapid Zn deposition.Consequently,the Zn/4Mpy/Cu electrode not only enables the symmetric cell to stably cycle for over 180 h at 10 mA cm^(-2) under a high depth-of-discharge of 90%,but also allows the MnO_(2)-paired pouch cell to survive for 100 cycles under a high Zn utilization rate of 78.8%.An anode-free 4Mpy/Cu||graphite cell also operates for 150 cycles without obvious capacity fading at 0.1 A g^(-1).This control of interfacial chemistry via SAMs to achieve high utilization rates of metal anodes provides a new paradigm for developing high-energy metal-based batteries.
文摘About this issue:Radar astronomy is a science that utilizes radar electromagnetic waves to study celestial bodies within and beyond the solar system,focusing mainly on planets,satellites and small bodies such as the Moon,Mars,Venus and Saturn.Through radar electromagnetic wave detection,we are able to gain an in-depth understanding of these celestial bodies'internal structures,composition,distribution of water resources,magnetic fields,atmospheres,and other physical properties.This is of great significance for human beings to find a habitable environment in the solar system.At present,the observation methods of radar astronomy mainly rely on ground-based radio telescopes that actively emit electromagnetic waves.
基金funded by National Key R&D Program of China(Grant Nos.2024YFB3612200,2023YFB3609601,2022YFB3604300,2022YFB2802801,2022YFB3604802)Natural Science Foundation of China(Grant Nos.U24A20300,62174174,62274177,62275263,62325406,62374172,62304242,62304240,62404241)+4 种基金Youth Innovation Promotion Association of CAS(Grant Nos.2022323 and 2022324)Key R&D Program of Jiangsu Province(Grant No.BE2023018-2)Basic Research Program of Jiangsu(Grant No.BK20240126)Suzhou Science and Technology Program(Grant Nos.SYC2022089,ZXL2024379,and ZXL2024376)Guangdong Basic and Applied Basic Research Foundation(Grant Nos.2022A1515110482 and 2022A1515110004).
文摘Photonic crystal surface emitting lasers(PCSELs)utilize the Bragg diffraction of two-dimensional photonic crystals to achieve a single-mode output with a high power and a small divergence angle,and has recently attracted much attention^([1−3]).In 2023,Kyoto University reported GaAs-based 945 nm PCSELs with a continuous-wave(CW)single-mode output power of exceeding 50 W,and a narrow beam divergence angle of 0.05°,demonstrating a brightness of 1 GW·cm^(−2)·sr^(−1),which rivals those of the existing bulky lasers^([4]).
