The magnesium-based materials are acknowledged as one of the most promising solid-state hydrogen storage mediums,attributed to their superior hydrogen storage capacity.Nevertheless,challenges such as sluggish kinetics...The magnesium-based materials are acknowledged as one of the most promising solid-state hydrogen storage mediums,attributed to their superior hydrogen storage capacity.Nevertheless,challenges such as sluggish kinetics,thermodynamic stability,inadequate cycling stability,and difficulties in activation impede the commercial utilization of Mg-based composites.Research indicates that reducing material dimensions to the nanoscale represents an efficacious strategy to address these issues.In this work,we systematically analyze the impact of nanosizing on Mg-based composites from three perspectives:nano-substrate modulation,nano-catalyst construction,and nano-catalytic mechanism.This analysis aims to provide guidance for the optimization and development of nanosizing strategies.For the regulation of nanosizing of Mg-based composites,the nanosizing of multi-element micro-alloyed Mg-rich systems,the integrated synthesis of multi-element multi-component nano-catalysts,and the coexistence of multiple nano-catalytic mechanisms are proposed in the light of the current state of the art research,artificial intelligence technology,and advanced characterization technology to achieve efficient,multidimensional,and simultaneous regulation of the hydrogen storage performance of Mg-based composites.This paper also envisions future directions and potential applications,emphasizing the importance of interdisciplinary approaches that integrate material science,chemistry,and computational modeling to overcome existing limitations and unlock the full potential of Mg-based hydrogen storage technologies.展开更多
The aim of this research is to delve into the development and refinement of a curriculum focused on ideological and political education,rooted in the principles of Party-building.The study underscores the importance o...The aim of this research is to delve into the development and refinement of a curriculum focused on ideological and political education,rooted in the principles of Party-building.The study underscores the importance of merging theoretical knowledge with practical application,guided by innovative pedagogical approaches aimed at producing individuals with robust political consciousness and moral integrity,who are poised to become the next generation of socialist leaders and inheritors.This paper scrutinizes the strategies employed by higher education institutions to develop a curriculum system that places Party-building and ideological education at its core.By instituting a multi-layered and all-encompassing curriculum,the emphasis is on the synthesis of theory with practice.Students are motivated to integrate their academic insights through the examination of case studies and engagement with practical scenarios,thereby narrowing the divide between theoretical understanding and its practical application.In addition,educational institutions are increasingly incorporating cutting-edge technologies to invigorate teaching methods,thereby heightening student involvement and the efficacy of the courses.Concurrently,a comprehensive evaluation framework is being formulated to gauge students’proficiency in ideological and political realms,which is instrumental in nurturing their holistic development.The discoveries of this research yield significant insights and propose strategies for the ongoing enhancement of ideological and political education at the university level.It advocates for the continuous evolution of educational practices to meet the evolving needs of cultivating socially responsible and politically astute leaders.展开更多
气候变化背景下,灾害风险的不确定性与复杂性也随之增加。青岛是我国北方典型的海岸带丘陵城市,相较于南方沿海城市,风暴潮发生的频率及强度相对较低。但在未来气候变化背景下,风暴潮发生的频率和破坏程度均会增加,同时产生的损失也会...气候变化背景下,灾害风险的不确定性与复杂性也随之增加。青岛是我国北方典型的海岸带丘陵城市,相较于南方沿海城市,风暴潮发生的频率及强度相对较低。但在未来气候变化背景下,风暴潮发生的频率和破坏程度均会增加,同时产生的损失也会增大。以风暴潮淹没风险的空间影响为基本切入点,将风暴潮淹没的空间影响范围细化为风暴潮直接淹没区、海浪越坝淹没区、受潮水顶托直接影响的积水区和受潮水顶托间接影响的积水区四类。在此基础上,依托ArcGIS(Arc Geographic Information System)平台,对风暴潮空间影响范围及其变化进行有效量化,并提出重点防控岸段及重点防控期。结果表明:相较于2025年现状情景,在未来气候变化背景下,随着时间尺度增长,风暴潮对青岛市4类淹没风险影响的范围及需重点防控岸段不断扩大,影响范围和部分重点工业区分布有明显的重合趋势,同时影响范围和需重点防控的岸段及时段也随着不同台风类型而不同。因此明晰未来风暴潮可能影响的淹没范围及时段,既可以为青岛市在短时间尺度内规避风暴潮引发的淹没风险,也可以在中长时间尺度内为灾害预防管理和区域规划开发提供理论依据,同时为北方海岸带城市适应气候变化和韧性发展提供理论支撑。展开更多
Background In this study,the effects of L-leucine(Leu)on rumen fermentation parameters,rumen epithelium development,amino acid composition,rumen bacterial communities and rumen metabolites in beef cattle were investig...Background In this study,the effects of L-leucine(Leu)on rumen fermentation parameters,rumen epithelium development,amino acid composition,rumen bacterial communities and rumen metabolites in beef cattle were investigated.Twenty-four fattening Angus females of similar initial weight(575.5±22.1 kg)were randomly assigned to 2 treatments with 4 replicate pens(3 cattle per pen).They were fed either a basal diet or a basal diet supplemented with 6.0 g L-Leu/100 kg BW/d for 120 d.Results(1)Leu increased the ruminal concentrations of total volatile fatty acid(VFA)(P=0.017),propionate(P=0.023),isovalerate(P=0.001),and branched-chain volatile fatty acid(BCVFA)(P=0.01)at 4 h post-feeding.It also tended to increase acetate(P=0.083)and decrease the ammonia-N(NH_3-N)concentration(P=0.055),but it did not affect ruminal pH(P>0.1).Leu also increased microbial crude protein(MCP)(P=0.026)at 4 h post-feeding,but decreased MCP at 8 h post-feeding(P=0.010).(2)Supplementation with L-Leu increased the ruminal concentrations of phenylalanine(P=0.011),lysine(P=0.034),and tyrosine(P=0.033),while decreasing the cystine concentration(P=0.010).(3)Leu increased the thickness of the stratum spinosum and basal(P<0.05),while decreasing the thickness of the stratum granulosum(P<0.05).(4)Leu upregulated the relative mRNA abundance of genes involved in tight junction proteins(P<0.05)and VFA absorption and metabolism(P<0.01)in the rumen epithelium.This upregulation was positively correlated with the concentrations ruminal isovalerate and BCVFA(P<0.01).(5)L-Leu did not affect the diversity and richness of ruminal microbes(P>0.05),but differential bacterial biomarkers(LEfSe,LDA>2)were either positively or negatively correlated with ruminal MCP,NH_3-N,and BCVFA concentrations(P<0.001).Additionally,differential bacterial metabolites(OPLS-DA,VIP>1.5)were primarily enriched in the amino acid metabolism pathway and the cofactors and vitamins metabolism pathway(P<0.05).Conclusions Dietary supplementation with L-Leu altered rumen fermentation parameters and patterns,improved rumen epithelial morphology,and enhanced the expression of genes related to VFA absorption and metabolism in the rumen epithelium of beef cattle.展开更多
The effective precipitation and the frame of atmospheric circulation in the past three key periods, i.e. 30 ka BP, 18 ka BP and 6 ka BP, have been analyzed on the basis of the palaeolake status record produced by the ...The effective precipitation and the frame of atmospheric circulation in the past three key periods, i.e. 30 ka BP, 18 ka BP and 6 ka BP, have been analyzed on the basis of the palaeolake status record produced by the Chinese Lake Status Data Base. The results show that the west-central part of China was characterized by high lake-levels at 30 ka BP, resulting from strengthened southwest monsoons; whereas the high lake stand, occurring in the west-central part of China at 18 ka BP, was caused by the southward shift and the strengthening of westerlies although the high-stand distribution was reduced. Meanwhile, the east-central part of China was under the control of strong winter monsoons at 18 ka BP. The high lake-levels, which occurred in the east-central part of China at 6 ka BP, are related to the enhanced East-Asian summer monsoons; while the lowering of the lake-level in the west-central part of China at 6 ka BP was due to the northward shift and corresponding shrink of the westerlies.A comparison between the lake status and the palaeoclimate models has shown that there do exist discrepancies between the geological evidence and the model simulations. The agreement between them provides a possible mechanical explanation on the geological phenomena, but the discrepancy shows that the model needs to be revised to a great extent.展开更多
Global warming is causing the climate to change,lakes to dry up and less rain to fall. In population ecology,researchers have found that climate change plays an important role in controlling the size of species popula...Global warming is causing the climate to change,lakes to dry up and less rain to fall. In population ecology,researchers have found that climate change plays an important role in controlling the size of species populations.展开更多
Temporal and spatial heterogeneity identifications of marine environment and its changes have great significances in marine spatial planning and offshore pollution control.In this study,considering the integration of ...Temporal and spatial heterogeneity identifications of marine environment and its changes have great significances in marine spatial planning and offshore pollution control.In this study,considering the integration of marine ecological environment and sea-land interaction,we built a spatialized evaluation model named Marine Environment Change Spatial Assessment(MECSA)to quantify the marine environment status and changes.In MECSA,we applied the geospatial model and the pressure-state-response(PSR)model for processing and integrating evaluation indicators.A case study in the Laizhou Bay showed that the marine environment quality was generally in a declining state from 2009 to 2015.In 2015,the Marine Environment Index(MEI)had decreased by 0.1 compared with 2009,although the two years all reached a‘Good'level.The spatial MEI layers of the two years showed a same distribution:the southwestern part was in poorer status,with a fan ring shape gradually getting better to the northeast.The Marine Organisms Response Index(MORI)contributed the most to the MEI.Therefore,future marine environmental assessment and spatial planning should focus on the identification the marine environment with its changes from the perspective of spatial heterogeneity and systemicity.Based on single indicators and comprehensive evaluation results,we can propose spatially targeted policies and recommendations scientifically.展开更多
Visual data mining is one of important approach of data mining techniques. Most of them are based on computer graphic techniques but few of them exploit image-processing techniques. This paper proposes an image proces...Visual data mining is one of important approach of data mining techniques. Most of them are based on computer graphic techniques but few of them exploit image-processing techniques. This paper proposes an image processing method, named RNAM （resemble neighborhood averaging method）, to facilitate visual data mining, which is used to post-process the data mining result-image and help users to discover significant features and useful patterns effectively. The experiments show that the method is intuitive, easily-understanding and effectiveness. It provides a new approach for visual data mining.展开更多
基金financially supported by the Key Research and Development Projects of Shaanxi Province(Grant Nos.2025CYYBXM-154 and 2024GX-YBXM-213)the Yulin Science and Technology Bureau(Grant Nos.2023-CXY-202 and 2024-CXY-154)the Technology Innovation Leading Program of Shaanxi(Programs 2023GXLH-068)。
文摘The magnesium-based materials are acknowledged as one of the most promising solid-state hydrogen storage mediums,attributed to their superior hydrogen storage capacity.Nevertheless,challenges such as sluggish kinetics,thermodynamic stability,inadequate cycling stability,and difficulties in activation impede the commercial utilization of Mg-based composites.Research indicates that reducing material dimensions to the nanoscale represents an efficacious strategy to address these issues.In this work,we systematically analyze the impact of nanosizing on Mg-based composites from three perspectives:nano-substrate modulation,nano-catalyst construction,and nano-catalytic mechanism.This analysis aims to provide guidance for the optimization and development of nanosizing strategies.For the regulation of nanosizing of Mg-based composites,the nanosizing of multi-element micro-alloyed Mg-rich systems,the integrated synthesis of multi-element multi-component nano-catalysts,and the coexistence of multiple nano-catalytic mechanisms are proposed in the light of the current state of the art research,artificial intelligence technology,and advanced characterization technology to achieve efficient,multidimensional,and simultaneous regulation of the hydrogen storage performance of Mg-based composites.This paper also envisions future directions and potential applications,emphasizing the importance of interdisciplinary approaches that integrate material science,chemistry,and computational modeling to overcome existing limitations and unlock the full potential of Mg-based hydrogen storage technologies.
文摘The aim of this research is to delve into the development and refinement of a curriculum focused on ideological and political education,rooted in the principles of Party-building.The study underscores the importance of merging theoretical knowledge with practical application,guided by innovative pedagogical approaches aimed at producing individuals with robust political consciousness and moral integrity,who are poised to become the next generation of socialist leaders and inheritors.This paper scrutinizes the strategies employed by higher education institutions to develop a curriculum system that places Party-building and ideological education at its core.By instituting a multi-layered and all-encompassing curriculum,the emphasis is on the synthesis of theory with practice.Students are motivated to integrate their academic insights through the examination of case studies and engagement with practical scenarios,thereby narrowing the divide between theoretical understanding and its practical application.In addition,educational institutions are increasingly incorporating cutting-edge technologies to invigorate teaching methods,thereby heightening student involvement and the efficacy of the courses.Concurrently,a comprehensive evaluation framework is being formulated to gauge students’proficiency in ideological and political realms,which is instrumental in nurturing their holistic development.The discoveries of this research yield significant insights and propose strategies for the ongoing enhancement of ideological and political education at the university level.It advocates for the continuous evolution of educational practices to meet the evolving needs of cultivating socially responsible and politically astute leaders.
文摘气候变化背景下,灾害风险的不确定性与复杂性也随之增加。青岛是我国北方典型的海岸带丘陵城市,相较于南方沿海城市,风暴潮发生的频率及强度相对较低。但在未来气候变化背景下,风暴潮发生的频率和破坏程度均会增加,同时产生的损失也会增大。以风暴潮淹没风险的空间影响为基本切入点,将风暴潮淹没的空间影响范围细化为风暴潮直接淹没区、海浪越坝淹没区、受潮水顶托直接影响的积水区和受潮水顶托间接影响的积水区四类。在此基础上,依托ArcGIS(Arc Geographic Information System)平台,对风暴潮空间影响范围及其变化进行有效量化,并提出重点防控岸段及重点防控期。结果表明:相较于2025年现状情景,在未来气候变化背景下,随着时间尺度增长,风暴潮对青岛市4类淹没风险影响的范围及需重点防控岸段不断扩大,影响范围和部分重点工业区分布有明显的重合趋势,同时影响范围和需重点防控的岸段及时段也随着不同台风类型而不同。因此明晰未来风暴潮可能影响的淹没范围及时段,既可以为青岛市在短时间尺度内规避风暴潮引发的淹没风险,也可以在中长时间尺度内为灾害预防管理和区域规划开发提供理论依据,同时为北方海岸带城市适应气候变化和韧性发展提供理论支撑。
基金supported by the National Key R&D Program(Grant No.2022YFD1301101-1)National Natural Science Foundation of China(Grant No.32172758)Key Research and Development Program of Ningxia(Grant No.2024BBF01008)。
文摘Background In this study,the effects of L-leucine(Leu)on rumen fermentation parameters,rumen epithelium development,amino acid composition,rumen bacterial communities and rumen metabolites in beef cattle were investigated.Twenty-four fattening Angus females of similar initial weight(575.5±22.1 kg)were randomly assigned to 2 treatments with 4 replicate pens(3 cattle per pen).They were fed either a basal diet or a basal diet supplemented with 6.0 g L-Leu/100 kg BW/d for 120 d.Results(1)Leu increased the ruminal concentrations of total volatile fatty acid(VFA)(P=0.017),propionate(P=0.023),isovalerate(P=0.001),and branched-chain volatile fatty acid(BCVFA)(P=0.01)at 4 h post-feeding.It also tended to increase acetate(P=0.083)and decrease the ammonia-N(NH_3-N)concentration(P=0.055),but it did not affect ruminal pH(P>0.1).Leu also increased microbial crude protein(MCP)(P=0.026)at 4 h post-feeding,but decreased MCP at 8 h post-feeding(P=0.010).(2)Supplementation with L-Leu increased the ruminal concentrations of phenylalanine(P=0.011),lysine(P=0.034),and tyrosine(P=0.033),while decreasing the cystine concentration(P=0.010).(3)Leu increased the thickness of the stratum spinosum and basal(P<0.05),while decreasing the thickness of the stratum granulosum(P<0.05).(4)Leu upregulated the relative mRNA abundance of genes involved in tight junction proteins(P<0.05)and VFA absorption and metabolism(P<0.01)in the rumen epithelium.This upregulation was positively correlated with the concentrations ruminal isovalerate and BCVFA(P<0.01).(5)L-Leu did not affect the diversity and richness of ruminal microbes(P>0.05),but differential bacterial biomarkers(LEfSe,LDA>2)were either positively or negatively correlated with ruminal MCP,NH_3-N,and BCVFA concentrations(P<0.001).Additionally,differential bacterial metabolites(OPLS-DA,VIP>1.5)were primarily enriched in the amino acid metabolism pathway and the cofactors and vitamins metabolism pathway(P<0.05).Conclusions Dietary supplementation with L-Leu altered rumen fermentation parameters and patterns,improved rumen epithelial morphology,and enhanced the expression of genes related to VFA absorption and metabolism in the rumen epithelium of beef cattle.
基金sponsored by the One-hundred Talents Project of the Chinese Academy of SciencesNational Natural Science Foundation of China(49971075)the Key Project A of the Chinese Academy of Sciences(KZ951-A1-402-04-06).
文摘The effective precipitation and the frame of atmospheric circulation in the past three key periods, i.e. 30 ka BP, 18 ka BP and 6 ka BP, have been analyzed on the basis of the palaeolake status record produced by the Chinese Lake Status Data Base. The results show that the west-central part of China was characterized by high lake-levels at 30 ka BP, resulting from strengthened southwest monsoons; whereas the high lake stand, occurring in the west-central part of China at 18 ka BP, was caused by the southward shift and the strengthening of westerlies although the high-stand distribution was reduced. Meanwhile, the east-central part of China was under the control of strong winter monsoons at 18 ka BP. The high lake-levels, which occurred in the east-central part of China at 6 ka BP, are related to the enhanced East-Asian summer monsoons; while the lowering of the lake-level in the west-central part of China at 6 ka BP was due to the northward shift and corresponding shrink of the westerlies.A comparison between the lake status and the palaeoclimate models has shown that there do exist discrepancies between the geological evidence and the model simulations. The agreement between them provides a possible mechanical explanation on the geological phenomena, but the discrepancy shows that the model needs to be revised to a great extent.
基金support for this work was provided by Key Directional Program of the Knowledge-innovation Project of the Chinese Academy of Sciences:High-resolution lake records and the environmental hydrology simulations during the past 3,000 years in China (KZCX2-YW-338-2)
文摘Global warming is causing the climate to change,lakes to dry up and less rain to fall. In population ecology,researchers have found that climate change plays an important role in controlling the size of species populations.
基金surported by the Public Science and Technology Research Funds Projects of Ocean(No.201505001)。
文摘Temporal and spatial heterogeneity identifications of marine environment and its changes have great significances in marine spatial planning and offshore pollution control.In this study,considering the integration of marine ecological environment and sea-land interaction,we built a spatialized evaluation model named Marine Environment Change Spatial Assessment(MECSA)to quantify the marine environment status and changes.In MECSA,we applied the geospatial model and the pressure-state-response(PSR)model for processing and integrating evaluation indicators.A case study in the Laizhou Bay showed that the marine environment quality was generally in a declining state from 2009 to 2015.In 2015,the Marine Environment Index(MEI)had decreased by 0.1 compared with 2009,although the two years all reached a‘Good'level.The spatial MEI layers of the two years showed a same distribution:the southwestern part was in poorer status,with a fan ring shape gradually getting better to the northeast.The Marine Organisms Response Index(MORI)contributed the most to the MEI.Therefore,future marine environmental assessment and spatial planning should focus on the identification the marine environment with its changes from the perspective of spatial heterogeneity and systemicity.Based on single indicators and comprehensive evaluation results,we can propose spatially targeted policies and recommendations scientifically.
基金Supported by the National Natural Science Foun-dation of China (60173051) ,the Teaching and Research Award Pro-gramfor Outstanding Young Teachers in Higher Education Institu-tions of Ministry of Education of China ,and Liaoning Province HigherEducation Research Foundation (20040206)
文摘Visual data mining is one of important approach of data mining techniques. Most of them are based on computer graphic techniques but few of them exploit image-processing techniques. This paper proposes an image processing method, named RNAM （resemble neighborhood averaging method）, to facilitate visual data mining, which is used to post-process the data mining result-image and help users to discover significant features and useful patterns effectively. The experiments show that the method is intuitive, easily-understanding and effectiveness. It provides a new approach for visual data mining.
