Green Barrier,a significant component of the non-tariff barrier,is playing a more and more important role in the international trade.The impact of the green barrier by EU on Chinese farm products has become a crucial ...Green Barrier,a significant component of the non-tariff barrier,is playing a more and more important role in the international trade.The impact of the green barrier by EU on Chinese farm products has become a crucial problem which is attracting more and more attention of Chinese people.This paper begins with the appearance of the green barrier,emphatically studies the impact of green barrier of EU on the export of farm produces of China and put forward the countermeasures in end.展开更多
On October 17, 2017, the first stay ring of Baihetan 1 million kW hydropower units, with the largest unit capacity in the world, passed the acceptance inspection. Shenyang Research Institute of Foundry （SRIF） has be...On October 17, 2017, the first stay ring of Baihetan 1 million kW hydropower units, with the largest unit capacity in the world, passed the acceptance inspection. Shenyang Research Institute of Foundry （SRIF） has been recognized by owners and OEMs of Baihetan Hydropower Station for its long-term and stable （electroslag remelting）＂ and technology of ＂AOD ＋ ESR good performance of guide vanes at several major hydropower projects both at home and abroad.展开更多
How do elements originate, how atoms are formed, and what are the laws? According to the unified logic of “Tong Yi Lun Thought”, combined with the elements’ attributes and the atomic composition that have been disc...How do elements originate, how atoms are formed, and what are the laws? According to the unified logic of “Tong Yi Lun Thought”, combined with the elements’ attributes and the atomic composition that have been discovered now, after determining that the mechanism of increasing yang in the atomic system is the increase of proton number, the Bian Zheng relationship among proton, neutron and electron determines that there are only 128 kinds of elements in the atomic system. At the same time, element atoms have corresponding logical relations when they are generated.展开更多
When telecom giants in the world propose strategic transformation, domestic and foreign telecom equipment manufacturers at upper industrial chain are also faced with the dilemma of transformation, because each section...When telecom giants in the world propose strategic transformation, domestic and foreign telecom equipment manufacturers at upper industrial chain are also faced with the dilemma of transformation, because each section on the telecom industrial chain is closely connected with each other. Wu Ying,展开更多
On March 11,2026,Zhongfu Shenying Carbon Fiber Co,Ltd,a subsidiary of China National Building Material Group(CNBM)unveliled an independently developed ultra high-strength carbon fiber,the SYT8O(11200-grade).China beca...On March 11,2026,Zhongfu Shenying Carbon Fiber Co,Ltd,a subsidiary of China National Building Material Group(CNBM)unveliled an independently developed ultra high-strength carbon fiber,the SYT8O(11200-grade).China became the first country to mass-produce T120O-grade carbon fiber,a high-performance materia with applications in defense,aerospace and robotics.展开更多
Maize(Zea mays L.)is recognized as one of the most significant cereal crops worldwide,serving as a primary source of human food,animal feed,and industrial raw materials.With increasing diversification of market demand...Maize(Zea mays L.)is recognized as one of the most significant cereal crops worldwide,serving as a primary source of human food,animal feed,and industrial raw materials.With increasing diversification of market demands for specialty maize varieties,distinctive fresh produce cultivars characterized by unique textures have gained considerable popularity among consumers(Boyer and Shannon 1984).Notably,sweet maize is often referred to as the‘King of fruits and vegetables'due to its richness in polysaccharides,dietary fiber,trace elements,vitamins,linoleic acid,and other essential nutrients(Revilla et al.2021).展开更多
Dream-Building in Tangwangcheng Chief Director:Chen Xichan Length:Four Episodes Producers:The Third Division of Xinjiang Production and Construction Corps and Hunan Broadcasting System Broadcasting Platforms:Mango TV,...Dream-Building in Tangwangcheng Chief Director:Chen Xichan Length:Four Episodes Producers:The Third Division of Xinjiang Production and Construction Corps and Hunan Broadcasting System Broadcasting Platforms:Mango TV,Tencent Video,Youku,and bilibili.展开更多
Matter and Radiation at Extremes(MRE),is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation,and the associated science and technology ...Matter and Radiation at Extremes(MRE),is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation,and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory.Drivers,targets and diagnostics are included along with related numerical simulation and computational methods.It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.展开更多
Quasi-hemispherical magnetized collisionless shocks have been generated at the SG-II laser facility through the interaction between a laserproduced supersonic plasma flow and a magnetized ambient plasma,exhibiting an ...Quasi-hemispherical magnetized collisionless shocks have been generated at the SG-II laser facility through the interaction between a laserproduced supersonic plasma flow and a magnetized ambient plasma,exhibiting an angular asymmetric shock profile accompanied by asymmetric ion acceleration.We have conducted test particle simulations using the electromagnetic fields derived from 2D MHD simulations to investigate the asymmetry of ion acceleration.The simulations reproduce the angular asymmetry of the shock and the ion acceleration observed in experiments.The results indicate that shock drift acceleration is the primary mechanism for ion energization in the present quasiperpendicular magnetized shock.The asymmetric shock structure caused by nonuniform ambient plasma forms an asymmetric accelerated electric field,ultimately leading to angular asymmetric ion acceleration,which is consistent with space observations and our experimental results.Our study provides a plausible explanation for the discrepancies reported in previous ion acceleration experiments,and could contribute to understanding of the collisionless shock acceleration.展开更多
High harmonic generation(HHG)provides an experimental method for producing attosecond pulses and probing electron dynamics.Achieving precise dipole phase measurements is critical for tailoring the harmonic emission ph...High harmonic generation(HHG)provides an experimental method for producing attosecond pulses and probing electron dynamics.Achieving precise dipole phase measurements is critical for tailoring the harmonic emission phase and identifying the HHG mechanism.However,achieving this feature by applying traditional two-beam far-field interferometry to solid materials remains challenging.In this study,we present a novel interferometric approach that utilizes a single laser beam to excite two ZnO microwires(MWs)simultaneously,thereby generating coherent high-harmonic sources that form interference fringes in the far-field region.We leverage the diameter-dependent field-enhancement effect in MWs to measure the intensity-dependent fringe shift,revealing that the intraband current mechanism dominates the below-bandgap harmonic,whereas the interband polarization mechanism dominates the above-bandgap harmonic.This study offers a robust method for measuring the dipole phase of solid-state HHG and inspires intensity-modulated high-harmonic applications in coherent imaging and microdevice design.展开更多
deployment of the THAAD system in South Korea imposed by the United States is superficially and nominally to target at the DPRK's nuclear and missile threats,but essentially to respond to the rising China and Russ...deployment of the THAAD system in South Korea imposed by the United States is superficially and nominally to target at the DPRK's nuclear and missile threats,but essentially to respond to the rising China and Russia,is further tied South Korea to the U.S.war chariot and is a dose of poison undermining the Northeast Asian environment for the mutual benefit,mutual trust and win-win cooperation as well as development and stability.展开更多
Promoting the deep integration of advanced manufacturing and producer services is not only a key path for metropolitan to climb the global value chain,but also an important new driving force for optimizing urban spati...Promoting the deep integration of advanced manufacturing and producer services is not only a key path for metropolitan to climb the global value chain,but also an important new driving force for optimizing urban spatial structure.Based on the two dimen-sions of industrial linkage and spatial co-agglomeration from the perspective of industrial integration,taking Beijing,China as a case,using industrial input-output data,micro-enterprise spatial data,and methods such as industrial linkage model,standard deviation el-lipse,and spatial similarity coefficient,this study explores the coupling relationship between industrial linkage and spatial co-agglomer-ation of advanced manufacturing and producer services from 2007 to 2020.The results demonstrate that:1)the industrial linkage between advanced manufacturing and producer services in Beijing has an upward trend,in which the business services have the most significant improvement,in which the business services have the most improvement while the technology services have the most de-crease,but in general,the industrial linkage between the two industries shows a low level.2)Producer services were more spatially clustered than advanced manufacturing,and the degree of spatial co-agglomeration of the two also showed an increasing trend,with strong regional and industrial heterogeneity characteristics,among which the pairing industry involving commerce services and techno-logy services had a more obvious improvement.3)The coupling analysis found that the spatial dependence between advanced manufac-turing and producer services decreased,showing a weak positive correlation and a decreasing trend between industrial linkage and spa-tial co-agglomeration;the heterogeneity among subdivision pairs is prominent,and the strong correlation between industries does not mean that there is an inevitable spatial co-agglomeration.4)Based on the differences in coupling relationships and influence mechan-isms,four coupling modes are identified:H-H type,H-L type,L-L type,and L-H type.Finally,this study proposes three policy implica-tions for the integration of advanced manufacturing and producer services in metropolitan areas.展开更多
This study synthesizes and evaluates a novel polysulfone-based membrane doped with graphene oxidepolyethyleneimine-silicon oxide(GO-SiO_(2)-PEI),specifically designed for oily water treatment applications.The function...This study synthesizes and evaluates a novel polysulfone-based membrane doped with graphene oxidepolyethyleneimine-silicon oxide(GO-SiO_(2)-PEI),specifically designed for oily water treatment applications.The functionalization of graphene oxide with SiO_(2) and PEI was rigorously confirmed through comprehensive XRD,FTIR,Raman spectroscopy,and XPS analyses,ensuring the integrity and expected functionality of the nanocomposite.This nanocomposite was integrated into the polysulfone(PSF)membrane matrix,significantly reducing the membrane's inherent hydrophobicity and propensity for fouling.The membranes were meticulously characterized using advanced surface and bulk sensitive apparatus including contact angle and SEM imaging to ascertain their structural and functional attributes.Performance evaluations conducted in a dead-end filtration setup revealed that incorporating 1.0%(mass) of the nanocomposite into the PSF membrane markedly enhanced its porosity and improved the water contact angle.This modification led to an 809% increase in the membrane's water flux and a 57%enhancement in flux recovery rate,while still maintaining a high oil rejection rate and a relatively low leaching rate of 5.3 mg·L^(-1).Analysis through the Owens-Wendt-Kaelble model indicated a significant increase in polar surface energy,corroborating the improved oil rejection capabilities at elevated flux levels.Fouling behavior,analyzed using Hermia's model,identified cake formation as the primary fouling mechanism in most of the tested membranes.Leaching tests further highlighted those membranes with higher nanocomposite loadings exhibited increased leaching rates,suggesting a trade-off between performance enhancement and material stability.展开更多
What Are You Up To Today?Chief Director:Wu Zijuan Length:12 Episodes Producer:bilibili Broadcasting Platform:bilibili Produced by China’s YouTube-like video sharing platform bilibili,the film is a series of short doc...What Are You Up To Today?Chief Director:Wu Zijuan Length:12 Episodes Producer:bilibili Broadcasting Platform:bilibili Produced by China’s YouTube-like video sharing platform bilibili,the film is a series of short documentaries presenting people's daily life in different jobs.It follows 12 individuals in their respective jobs and trades that keep society functioning.By focusing on their daily lives,the documentary films capture the hustle and bustle of the days that make up a hopeful life.展开更多
Codonopsis pilosula is a major Qi-tonifying medicinal herb,and its active composition is analyzed systematically.However,the relationship between its production origins and commodity specification grades with the acti...Codonopsis pilosula is a major Qi-tonifying medicinal herb,and its active composition is analyzed systematically.However,the relationship between its production origins and commodity specification grades with the active composition of C.pilosula lacks systematic research.This study integrates the HPLC and UV-Vis methodologies to evaluate the quality of C.pilosula from commodity specification grades and different origins,and it explores the correlation between ecological factors and production origins with active components.Here,network pharmacology is used to determine that lobetyolin,syringin,and tangshenoside I have potential efficacy in treating pulmonary fibrosis and oxidative stress.The HPLC and UV-Vis methods were employed to quantitatively analyse the levels of five active compounds from different origins and commodity specification grades.Ecological factors were collected from the different production origins with ArcGIS,and correlation analysis was conducted between these factors and the active components of C.pilosula to identify the key ecological influences that drive the accumulation of active compounds.Results showed that network pharmacology analyses indicated that the active components of C.pilosula,including lobetyolin,syringin,and tangshenoside I,bind to targets and exhibit antioxidant and antipulmonary fibrosis effects.Differences in the contents of active components across three commodity specification grades were not significant.The contents of active components in C.pilosula showed differences with varying origins,with the most variation observed in soluble sugar content,and notable variations are also observed in the levels of lobetyolin,syringin,and tangshenoside I,which could serve as potential biomarkers for different origins.Additionally,ecological factors influenced the accumulation of C.pilosula’s active components.The contents of soluble sugars and tangshenoside I were positively correlated with temperature and precipitation.Our study evaluated the active components of C.pilosula,and findings show that lobetyolin,syringin,and tangshenoside I have potential efficacy in treating pulmonary fibrosis and oxidative stress.The differences in the quality of C.pilosula across varying commodity specification grades are not significant.The different contents of C.pilosula across varying origins are significant,with soluble sugars and glycosides serving as potential markers for distinguishing C.pilosula from different origins.Moreover,ecological factors drove the accumulation of C.pilosula components.Soluble sugars and tangshenoside I content were particularly influenced by temperature and precipitation.Sand content and electrical conductivity significantly correlated with syringin,whereas organic carbon negatively influenced total flavonoids.This research provides a theoretical basis for the selection of the C.pilosula growing area and lays a foundation for the study of the C.pilosula quality standard.展开更多
Flax(Linum usitatissimum L.)is an important oil crop in the high-altitude arid regions of China.Flaxseed is rich in various nutrients.However,the nutritional qualities of flaxseeds from different producing areas are s...Flax(Linum usitatissimum L.)is an important oil crop in the high-altitude arid regions of China.Flaxseed is rich in various nutrients.However,the nutritional qualities of flaxseeds from different producing areas are still unclear.In this study,the nutritional characteristics of flaxseed from five producing areas in China were investigated.Twenty five nutritional quality indices in flaxseed were analyzed.Subsequently,chemometric methods,including cluster analysis,principal component analysis(PCA)and partial least square discriminant analysis(PLS-DA),were employed to discover the characteristics of nutritional qualities in flaxseeds.The results revealed there are significant differences in nutritional qualities among flaxseeds from different production areas.Six quality indices includingγ-tocopherol,vitamin E,phytosterols,oleic acid,α-linolenic acid,and cycloartenol were susceptible to producing area.In detail,the superiorcharacteristic nutrients of Ningxia flaxseed,Inner Mongolia flaxseed and Hebei flaxseed are vitamin E(17.3 mg/100g),α-linolenic acid(52.6%)and cycloartenol(1738.1 mg/kg),and phytosterols(3032.0 mg/kg),respectively.This study promotes the high-value development and utilization of local flaxseed industry.展开更多
Many mature onshore oilfields have entered a high-water-cut stage,with reservoir recovery approaching economic limits.Converting these depleted or nearly depleted reservoirs into underground gas storage(UGS)facilities...Many mature onshore oilfields have entered a high-water-cut stage,with reservoir recovery approaching economic limits.Converting these depleted or nearly depleted reservoirs into underground gas storage(UGS)facilities offers an efficient way to leverage their substantial storage potential.During cyclic gas injection and withdrawal,however,the reservoir experiences complex three-phase flow and repeated stress fluctuations,which can induce rock fatigue,inelastic deformation,and ultimately sand production.This study uses controlled physical experiments to simulate sand production in reservoir rocks subjected to alternating gas injection and production under three-phase conditions.After preparing oil-water-saturated cores through waterflooding,gas is introduced to perform repeated displacement cycles.Polynomial models relating core mass loss to water-oil ratio and cycle number are developed using the Newton interpolation method,enabling prediction of sand production under various operating conditions.Results show that,within the critical pressure-difference range for sand onset,permeability increases with water-oil ratio.When the water-oil ratio lies between 0.3 and 1,sand production decreases progressively;beyond a ratio of 1,sand production increases with further increases in water-oil ratio.The number of displacement cycles exerts a dominant influence:sand production remains relatively stable between 25 and 55 cycles but rises sharply thereafter.Average sand production during cycles 55–100 is 5.27 times higher than during cycles 5–55.These findings indicate that cumulative structural damage to the rock framework intensifies significantly with repeated cycling,making cycle number a critical factor governing sand production in UGS operations.展开更多
In the late 1970s,the theory of coal-formed gas began to take root,sprout,develop,and improve in China.After decades of development,a complete theoretical system was finally formed.The theory of coal-formed gas points...In the late 1970s,the theory of coal-formed gas began to take root,sprout,develop,and improve in China.After decades of development,a complete theoretical system was finally formed.The theory of coal-formed gas points out that coal measures are good gas source rocks,with gas as the main hydrocarbon generated and oil as the auxiliary.It has opened up a new exploration idea using coal-bearing humic organic matter as the gas source,transforming the theoretical guidance for natural gas exploration in China from“monism”(i.e.oil-type gas)to“dualism”(i.e.coal-formed gas and oil-type gas)and uncovering a new field of natural gas exploration.Before the establishment of the coal-formed gas theory,China was a gas-poor country with low proved gas initially-in-place(merely 2264.33×10^(8)m^(3))and production(137.3×10^(8)m^(3)/a),corresponding to a per capita annual consumption of only 14.37 m^(3).Guided by the theory of coal-formed gas,the natural gas industry of China has developed rapidly.By the end of 2023,China registered the cumulative proved gas initially-in-place of 20.90×10^(12)m^(3),an annual gas production of 2343×10^(8)m^(3),and a per capita domestic gas consumption reaching 167.36 m^(3).The cumulative proved reserves initially-in-place and production of natural gas were dominated by coal-formed gas.Owing to this advancement,China has transformed from a gas-poor country to the fourth largest gas producer in the world.The coal-formed gas theory and the tremendous achievements made in natural gas exploration in China under its guidance have promoted China from a gas-poor country to a major gas-producing country in the world.展开更多
文摘Green Barrier,a significant component of the non-tariff barrier,is playing a more and more important role in the international trade.The impact of the green barrier by EU on Chinese farm products has become a crucial problem which is attracting more and more attention of Chinese people.This paper begins with the appearance of the green barrier,emphatically studies the impact of green barrier of EU on the export of farm produces of China and put forward the countermeasures in end.
文摘On October 17, 2017, the first stay ring of Baihetan 1 million kW hydropower units, with the largest unit capacity in the world, passed the acceptance inspection. Shenyang Research Institute of Foundry （SRIF） has been recognized by owners and OEMs of Baihetan Hydropower Station for its long-term and stable （electroslag remelting）＂ and technology of ＂AOD ＋ ESR good performance of guide vanes at several major hydropower projects both at home and abroad.
文摘How do elements originate, how atoms are formed, and what are the laws? According to the unified logic of “Tong Yi Lun Thought”, combined with the elements’ attributes and the atomic composition that have been discovered now, after determining that the mechanism of increasing yang in the atomic system is the increase of proton number, the Bian Zheng relationship among proton, neutron and electron determines that there are only 128 kinds of elements in the atomic system. At the same time, element atoms have corresponding logical relations when they are generated.
文摘When telecom giants in the world propose strategic transformation, domestic and foreign telecom equipment manufacturers at upper industrial chain are also faced with the dilemma of transformation, because each section on the telecom industrial chain is closely connected with each other. Wu Ying,
文摘On March 11,2026,Zhongfu Shenying Carbon Fiber Co,Ltd,a subsidiary of China National Building Material Group(CNBM)unveliled an independently developed ultra high-strength carbon fiber,the SYT8O(11200-grade).China became the first country to mass-produce T120O-grade carbon fiber,a high-performance materia with applications in defense,aerospace and robotics.
基金supported by the Youth Research Foundation of Beijing Academy of Agriculture and Forestry Sciences,China(QNJJ202420)the Beijing Science and Technology Association Youth Lifting Project,Chinathe Beijing Municipal Rural Revitalization Agricultural Science and Technology Development Project,China(NY2401020224)。
文摘Maize(Zea mays L.)is recognized as one of the most significant cereal crops worldwide,serving as a primary source of human food,animal feed,and industrial raw materials.With increasing diversification of market demands for specialty maize varieties,distinctive fresh produce cultivars characterized by unique textures have gained considerable popularity among consumers(Boyer and Shannon 1984).Notably,sweet maize is often referred to as the‘King of fruits and vegetables'due to its richness in polysaccharides,dietary fiber,trace elements,vitamins,linoleic acid,and other essential nutrients(Revilla et al.2021).
文摘Dream-Building in Tangwangcheng Chief Director:Chen Xichan Length:Four Episodes Producers:The Third Division of Xinjiang Production and Construction Corps and Hunan Broadcasting System Broadcasting Platforms:Mango TV,Tencent Video,Youku,and bilibili.
文摘Matter and Radiation at Extremes(MRE),is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation,and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory.Drivers,targets and diagnostics are included along with related numerical simulation and computational methods.It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.
基金supported by the National Natural Science Foundation of China(Grant Nos.12205298 and 12175230)the Natural Science Foundation of Heilongjiang Province of China(Grant No.LH2024A010)+1 种基金the Fundamental Research Funds for the Central Universities,Controversial and Disruptive Projects of the Chinese Academy of Sciences(Grant No.FGSDFX-0001)the USTC Research Funds of the Double First-Class Initiative(Grant No.YD2140002006).
文摘Quasi-hemispherical magnetized collisionless shocks have been generated at the SG-II laser facility through the interaction between a laserproduced supersonic plasma flow and a magnetized ambient plasma,exhibiting an angular asymmetric shock profile accompanied by asymmetric ion acceleration.We have conducted test particle simulations using the electromagnetic fields derived from 2D MHD simulations to investigate the asymmetry of ion acceleration.The simulations reproduce the angular asymmetry of the shock and the ion acceleration observed in experiments.The results indicate that shock drift acceleration is the primary mechanism for ion energization in the present quasiperpendicular magnetized shock.The asymmetric shock structure caused by nonuniform ambient plasma forms an asymmetric accelerated electric field,ultimately leading to angular asymmetric ion acceleration,which is consistent with space observations and our experimental results.Our study provides a plausible explanation for the discrepancies reported in previous ion acceleration experiments,and could contribute to understanding of the collisionless shock acceleration.
基金supported by the National Key R&D Program of China (Grant Nos.2023YFA1406801 and 2022YFA1604301)the National Natural Science Foundation of China (Grant Nos.12434013,12595343,12404393,and 12174011)。
文摘High harmonic generation(HHG)provides an experimental method for producing attosecond pulses and probing electron dynamics.Achieving precise dipole phase measurements is critical for tailoring the harmonic emission phase and identifying the HHG mechanism.However,achieving this feature by applying traditional two-beam far-field interferometry to solid materials remains challenging.In this study,we present a novel interferometric approach that utilizes a single laser beam to excite two ZnO microwires(MWs)simultaneously,thereby generating coherent high-harmonic sources that form interference fringes in the far-field region.We leverage the diameter-dependent field-enhancement effect in MWs to measure the intensity-dependent fringe shift,revealing that the intraband current mechanism dominates the below-bandgap harmonic,whereas the interband polarization mechanism dominates the above-bandgap harmonic.This study offers a robust method for measuring the dipole phase of solid-state HHG and inspires intensity-modulated high-harmonic applications in coherent imaging and microdevice design.
文摘deployment of the THAAD system in South Korea imposed by the United States is superficially and nominally to target at the DPRK's nuclear and missile threats,but essentially to respond to the rising China and Russia,is further tied South Korea to the U.S.war chariot and is a dose of poison undermining the Northeast Asian environment for the mutual benefit,mutual trust and win-win cooperation as well as development and stability.
基金Under the auspices of National Natural Science Foundation of China(No.42371181)。
文摘Promoting the deep integration of advanced manufacturing and producer services is not only a key path for metropolitan to climb the global value chain,but also an important new driving force for optimizing urban spatial structure.Based on the two dimen-sions of industrial linkage and spatial co-agglomeration from the perspective of industrial integration,taking Beijing,China as a case,using industrial input-output data,micro-enterprise spatial data,and methods such as industrial linkage model,standard deviation el-lipse,and spatial similarity coefficient,this study explores the coupling relationship between industrial linkage and spatial co-agglomer-ation of advanced manufacturing and producer services from 2007 to 2020.The results demonstrate that:1)the industrial linkage between advanced manufacturing and producer services in Beijing has an upward trend,in which the business services have the most significant improvement,in which the business services have the most improvement while the technology services have the most de-crease,but in general,the industrial linkage between the two industries shows a low level.2)Producer services were more spatially clustered than advanced manufacturing,and the degree of spatial co-agglomeration of the two also showed an increasing trend,with strong regional and industrial heterogeneity characteristics,among which the pairing industry involving commerce services and techno-logy services had a more obvious improvement.3)The coupling analysis found that the spatial dependence between advanced manufac-turing and producer services decreased,showing a weak positive correlation and a decreasing trend between industrial linkage and spa-tial co-agglomeration;the heterogeneity among subdivision pairs is prominent,and the strong correlation between industries does not mean that there is an inevitable spatial co-agglomeration.4)Based on the differences in coupling relationships and influence mechan-isms,four coupling modes are identified:H-H type,H-L type,L-L type,and L-H type.Finally,this study proposes three policy implica-tions for the integration of advanced manufacturing and producer services in metropolitan areas.
基金made possible by Qatar University internal grant(i-GA-379)graduate sponsorship research award (GSRA7-1-0510-20046) from Qatar National Research Fund (QNRF)。
文摘This study synthesizes and evaluates a novel polysulfone-based membrane doped with graphene oxidepolyethyleneimine-silicon oxide(GO-SiO_(2)-PEI),specifically designed for oily water treatment applications.The functionalization of graphene oxide with SiO_(2) and PEI was rigorously confirmed through comprehensive XRD,FTIR,Raman spectroscopy,and XPS analyses,ensuring the integrity and expected functionality of the nanocomposite.This nanocomposite was integrated into the polysulfone(PSF)membrane matrix,significantly reducing the membrane's inherent hydrophobicity and propensity for fouling.The membranes were meticulously characterized using advanced surface and bulk sensitive apparatus including contact angle and SEM imaging to ascertain their structural and functional attributes.Performance evaluations conducted in a dead-end filtration setup revealed that incorporating 1.0%(mass) of the nanocomposite into the PSF membrane markedly enhanced its porosity and improved the water contact angle.This modification led to an 809% increase in the membrane's water flux and a 57%enhancement in flux recovery rate,while still maintaining a high oil rejection rate and a relatively low leaching rate of 5.3 mg·L^(-1).Analysis through the Owens-Wendt-Kaelble model indicated a significant increase in polar surface energy,corroborating the improved oil rejection capabilities at elevated flux levels.Fouling behavior,analyzed using Hermia's model,identified cake formation as the primary fouling mechanism in most of the tested membranes.Leaching tests further highlighted those membranes with higher nanocomposite loadings exhibited increased leaching rates,suggesting a trade-off between performance enhancement and material stability.
文摘What Are You Up To Today?Chief Director:Wu Zijuan Length:12 Episodes Producer:bilibili Broadcasting Platform:bilibili Produced by China’s YouTube-like video sharing platform bilibili,the film is a series of short documentaries presenting people's daily life in different jobs.It follows 12 individuals in their respective jobs and trades that keep society functioning.By focusing on their daily lives,the documentary films capture the hustle and bustle of the days that make up a hopeful life.
基金funded by the National Key R&D Plan(2022YFC3501804)Fundamental Research Funds for the Central Public Welfare Research Institutes(No.ZZ13-YQ-049)National Natural Science Foundation of China(ZXKT22001).
文摘Codonopsis pilosula is a major Qi-tonifying medicinal herb,and its active composition is analyzed systematically.However,the relationship between its production origins and commodity specification grades with the active composition of C.pilosula lacks systematic research.This study integrates the HPLC and UV-Vis methodologies to evaluate the quality of C.pilosula from commodity specification grades and different origins,and it explores the correlation between ecological factors and production origins with active components.Here,network pharmacology is used to determine that lobetyolin,syringin,and tangshenoside I have potential efficacy in treating pulmonary fibrosis and oxidative stress.The HPLC and UV-Vis methods were employed to quantitatively analyse the levels of five active compounds from different origins and commodity specification grades.Ecological factors were collected from the different production origins with ArcGIS,and correlation analysis was conducted between these factors and the active components of C.pilosula to identify the key ecological influences that drive the accumulation of active compounds.Results showed that network pharmacology analyses indicated that the active components of C.pilosula,including lobetyolin,syringin,and tangshenoside I,bind to targets and exhibit antioxidant and antipulmonary fibrosis effects.Differences in the contents of active components across three commodity specification grades were not significant.The contents of active components in C.pilosula showed differences with varying origins,with the most variation observed in soluble sugar content,and notable variations are also observed in the levels of lobetyolin,syringin,and tangshenoside I,which could serve as potential biomarkers for different origins.Additionally,ecological factors influenced the accumulation of C.pilosula’s active components.The contents of soluble sugars and tangshenoside I were positively correlated with temperature and precipitation.Our study evaluated the active components of C.pilosula,and findings show that lobetyolin,syringin,and tangshenoside I have potential efficacy in treating pulmonary fibrosis and oxidative stress.The differences in the quality of C.pilosula across varying commodity specification grades are not significant.The different contents of C.pilosula across varying origins are significant,with soluble sugars and glycosides serving as potential markers for distinguishing C.pilosula from different origins.Moreover,ecological factors drove the accumulation of C.pilosula components.Soluble sugars and tangshenoside I content were particularly influenced by temperature and precipitation.Sand content and electrical conductivity significantly correlated with syringin,whereas organic carbon negatively influenced total flavonoids.This research provides a theoretical basis for the selection of the C.pilosula growing area and lays a foundation for the study of the C.pilosula quality standard.
基金supported by the National Key Research and Devel-opment Project of China(2021YFD1600101)the earmarked fund for the China Agriculture Research System(CARS-12,CARS-13 and CARS-14)the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-ASTIP-2024-OCRI).
文摘Flax(Linum usitatissimum L.)is an important oil crop in the high-altitude arid regions of China.Flaxseed is rich in various nutrients.However,the nutritional qualities of flaxseeds from different producing areas are still unclear.In this study,the nutritional characteristics of flaxseed from five producing areas in China were investigated.Twenty five nutritional quality indices in flaxseed were analyzed.Subsequently,chemometric methods,including cluster analysis,principal component analysis(PCA)and partial least square discriminant analysis(PLS-DA),were employed to discover the characteristics of nutritional qualities in flaxseeds.The results revealed there are significant differences in nutritional qualities among flaxseeds from different production areas.Six quality indices includingγ-tocopherol,vitamin E,phytosterols,oleic acid,α-linolenic acid,and cycloartenol were susceptible to producing area.In detail,the superiorcharacteristic nutrients of Ningxia flaxseed,Inner Mongolia flaxseed and Hebei flaxseed are vitamin E(17.3 mg/100g),α-linolenic acid(52.6%)and cycloartenol(1738.1 mg/kg),and phytosterols(3032.0 mg/kg),respectively.This study promotes the high-value development and utilization of local flaxseed industry.
基金National Science and Technology Major Project(2025ZD1406805)“Key Technology for Efficient Construction of New Underground Gas Storage”Research Project of CNPC(2023DJ8308)“Research on Wellbore Treatment and Rapid Construction Method of Oil and Gas Reservoir and Thin Salt Layer Storage”National Key Research and Development Program of China(Grant No.2025ZD1406805 and Grant No.2025ZD1011105).
文摘Many mature onshore oilfields have entered a high-water-cut stage,with reservoir recovery approaching economic limits.Converting these depleted or nearly depleted reservoirs into underground gas storage(UGS)facilities offers an efficient way to leverage their substantial storage potential.During cyclic gas injection and withdrawal,however,the reservoir experiences complex three-phase flow and repeated stress fluctuations,which can induce rock fatigue,inelastic deformation,and ultimately sand production.This study uses controlled physical experiments to simulate sand production in reservoir rocks subjected to alternating gas injection and production under three-phase conditions.After preparing oil-water-saturated cores through waterflooding,gas is introduced to perform repeated displacement cycles.Polynomial models relating core mass loss to water-oil ratio and cycle number are developed using the Newton interpolation method,enabling prediction of sand production under various operating conditions.Results show that,within the critical pressure-difference range for sand onset,permeability increases with water-oil ratio.When the water-oil ratio lies between 0.3 and 1,sand production decreases progressively;beyond a ratio of 1,sand production increases with further increases in water-oil ratio.The number of displacement cycles exerts a dominant influence:sand production remains relatively stable between 25 and 55 cycles but rises sharply thereafter.Average sand production during cycles 55–100 is 5.27 times higher than during cycles 5–55.These findings indicate that cumulative structural damage to the rock framework intensifies significantly with repeated cycling,making cycle number a critical factor governing sand production in UGS operations.
基金Supported by the National Natural Science Foundation of China(42372165)Science and Technology Special Project of PetroChina Oil&Gas and New Energy Company(2023YQX10101)+1 种基金Project of the Ministry of Natural Resources of China(QGYQZYPJ2022-1)China National Petroleum Corporation Science and Technology Project(2024DJ93)。
文摘In the late 1970s,the theory of coal-formed gas began to take root,sprout,develop,and improve in China.After decades of development,a complete theoretical system was finally formed.The theory of coal-formed gas points out that coal measures are good gas source rocks,with gas as the main hydrocarbon generated and oil as the auxiliary.It has opened up a new exploration idea using coal-bearing humic organic matter as the gas source,transforming the theoretical guidance for natural gas exploration in China from“monism”(i.e.oil-type gas)to“dualism”(i.e.coal-formed gas and oil-type gas)and uncovering a new field of natural gas exploration.Before the establishment of the coal-formed gas theory,China was a gas-poor country with low proved gas initially-in-place(merely 2264.33×10^(8)m^(3))and production(137.3×10^(8)m^(3)/a),corresponding to a per capita annual consumption of only 14.37 m^(3).Guided by the theory of coal-formed gas,the natural gas industry of China has developed rapidly.By the end of 2023,China registered the cumulative proved gas initially-in-place of 20.90×10^(12)m^(3),an annual gas production of 2343×10^(8)m^(3),and a per capita domestic gas consumption reaching 167.36 m^(3).The cumulative proved reserves initially-in-place and production of natural gas were dominated by coal-formed gas.Owing to this advancement,China has transformed from a gas-poor country to the fourth largest gas producer in the world.The coal-formed gas theory and the tremendous achievements made in natural gas exploration in China under its guidance have promoted China from a gas-poor country to a major gas-producing country in the world.
