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Assessing China’s human-environment relationship 被引量:11
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作者 YANG Yu LI Xiaoyun +4 位作者 DONG Wen POON P H Jessie HONG Hui HE Ze LIU Yi 《Journal of Geographical Sciences》 SCIE CSCD 2019年第8期1261-1283,共23页
China’s coupled human-environment system(CHES) is assessed here via a systems schema that emphasizes the complex interactions of components and their attributes. In addition to the human and environment components, w... China’s coupled human-environment system(CHES) is assessed here via a systems schema that emphasizes the complex interactions of components and their attributes. In addition to the human and environment components, we identified two other components to evaluate the relationship. The four components are human activity intensity, resource carrying capacity, ecological constraints and system’s openness. Based on their interactions, we derived a cognitive schema for classifying the level of strain or stress of an area. The analysis draws on 11 indicators and 29 sub-indicators including remote sensing data and statistical data that are used to estimate the four components. The findings indicate that human activities are highly intense in a few geographical areas, particularly large urban systems and trade and investment zones on the eastern coastal areas. Nonetheless, these areas are also well-endowed in water resources and fertile soils although urban systems are increasingly stressed from negative pollution externalities. They are also open systems which allow them to bear a higher level of pressure and adjust accordingly. Desertification and soil erosion point to relatively fragile biophysical systems in the west and southwest, but human activities are still relatively less intense compared to their coastal counterparts. As a whole, only 14% of areas may be said to be relatively or highly strained. This however belies another one-third of areas that are currently unstable, and likely to become strained and thereby vulnerable in the near future. 展开更多
关键词 coupled human-environment relationship systems HUMAN activity intensity resource-carrying capacity ECOLOGICAL CONSTRAINT OPENNESS China
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Changing human-environment interactions in medium mountains:the Apuseni Mts(Romania)as a case study 被引量:4
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作者 TELBISZ Tamas IMECS Zoltan +1 位作者 MARl Laszlo BOTTLIK Zsolt 《Journal of Mountain Science》 SCIE CSCD 2016年第9期1675-1687,共13页
The study of human-environment relationships in mountain areas is important for both theoretical and practical reasons, as many mountain areas suffer similar problems, such as depopulation, unemployment and natural ha... The study of human-environment relationships in mountain areas is important for both theoretical and practical reasons, as many mountain areas suffer similar problems, such as depopulation, unemployment and natural hazards. Medium mountains constitute a special case within mountains, because they are more populated but less attractive as tourist destinations than high mountains. In this context, the Apuseni Mts (Romania) are considered as a ease study. In this paper, we apply GIS-based, quantitative methods to characterize the strength and dynamics of human-environment interactions, taking into consideration some environmental factors (elevation, relative height, slope, river distance, lithology, land cover, natural attractions) as well as historical population and recent tourism data. We found that population density has strong (r2〉0.8) relationships with all relief factors (elevation, relative height, slope, river distance), and that best-fit functions are nonlinear. We outlined the varying demographic scenarios by elevation zones and interpreted the historically switching sign of population change versus elevation relationship. We demonstrated that lithology also has an impact on the spatial distribution of population, although it is not independent from the relief effect. The land cover of the mainly cultural landscape is very strongly correlated with relief parameters (especially slope), which suggests good adaptation. We pointed out the dominance of karst objects in the natural tourism potential of the Apuseni Mts and also explored further components of real tourism (spas, heritage, towns). Finally, we concluded that the environmental settings investigated do in fact constrain the spatial framework of society, but soeio-economic changes in history can be explained from the side of society, which conforms to the theory of cultural possibilism. 展开更多
关键词 human-environment relations ApuseniMountains Geographical information system (GIS) Possibilism TOURISM KARST
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Relationships Between Fractal Road and Drainage Networks in Wuling Mountainous Area:Another Symmetric Understanding of Human-Environment Relations 被引量:2
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作者 LIU Cheng-liang DUAN De-zhong ZHANG Hong 《Journal of Mountain Science》 SCIE CSCD 2014年第4期1060-1069,共10页
Symmetrical relationships between humans and their environment have been referred to as an extension of symmetries in the human geographical system and have drawn great attention.This paper explored the symmetry betwe... Symmetrical relationships between humans and their environment have been referred to as an extension of symmetries in the human geographical system and have drawn great attention.This paper explored the symmetry between physical and human systems through fractal analysis of the road and drainage networks in Wuling mountainous area.We found that both the road and drainage networks reflect weak clustering distributions.The evolution of the road network shared a significant self-organizing composition,while the drainage network showed obvious double fraetal characteristics.The geometric fractal dimension of the road network was larger than that of the drainage network.In addition,when assigned a weight relating to hierarchy or length,neither the road network nor drainage network showed a fractal property.These findings indicated that the fractal evolution of the road network shared certain similarities with fractal distribution of the drainage network.The symmetry between the two systems resulted from an interactive process of destroying symmetry at the lower order and reconstructing symmetry at the higher order.The relationships between the fractal dimensions of the rural-urban road network,the drainage network andthe urban system indicated that the development of this area was to achieve the symmetrical isomorphism of physical-human geographical systems. 展开更多
关键词 Fractal road network Fractal drainagenetwork SYMMETRY human-environment relation SELF-ORGANIZATION
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Research framework for integrated geography:Composite driving-system evolution-coupling mechanism-synergistic regulation
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作者 Wenwu Zhao Zizhao Ni +2 位作者 Caichun Yin Yanxu Liu Paulo Pereira 《Geography and Sustainability》 2025年第3期1-8,共8页
Amid ongoing global environmental change and the critical pursuit of sustainable development,human-environment systems are exhibiting increasingly complex dynamic evolutions and spatial relationships,underscoring an u... Amid ongoing global environmental change and the critical pursuit of sustainable development,human-environment systems are exhibiting increasingly complex dynamic evolutions and spatial relationships,underscoring an urgent need for innovative research frameworks.Integrated geography synthesizes physical geography,human geography,and geographic information science,providing key frameworks for understanding complex human-environment systems.This editorial proposes an emerging research framework for integrated geography—“Composite driving-System evolution-Coupling mechanism-Synergistic regulation(CSCS)”—based on key issues such as climate change,biodiversity loss,resource scarcity,and social-ecological interactions,which have been highlighted in both recent critical literature on human-environment systems and UN assessment reports.The framework starts with diverse composite driving forces,extends to the evolution of human-environment system structures,processes,and functions that these drivers induce,explores couplings within human-environment systems,and calls for regulation aimed at sustainable development in synergies.Major research frontiers include understanding the cascading“evolution-coupling”effects of shocks;measuring system resilience,thresholds,and safe and just operating space boundaries;clarifying linkage mechanisms across scales;and achieving synergistic outcomes for multi-objective sustainability.This framework will help promote the interdisciplinary integration and development of integrated geography,and provide geographical solutions for the global sustainable development agenda. 展开更多
关键词 Integrated geography Driving Evolution COUPLING REGULATION human-environment system
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Spatiotemporal characteristics of Neolithic tomb orientations in Central China informed by machine learning
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作者 ZHANG Xing LU Peng +1 位作者 CHEN Panpan WANG Zhen 《Journal of Geographical Sciences》 2025年第8期1793-1814,共22页
The orientations of ancient tombs have attracted increasing scholarly attention,as they offer valuable insights into early social structures,cultural traditions,and the relationship between humans and their environmen... The orientations of ancient tombs have attracted increasing scholarly attention,as they offer valuable insights into early social structures,cultural traditions,and the relationship between humans and their environment.However,the application of machine learning algorithms to the study of tomb orientation remains relatively underexplored.In this study,we employed a Gaussian mixture model to conduct a systematic analysis of the spatial and temporal evolution of Neolithic tomb orientations in Central China.We also examined the relationship between tomb orientation and both environmental factors and sociocultural dynamics.The findings suggest a deliberate and methodical approach to the planning and alignment of tombs during the Neolithic Age.Tomb orientations in each chronological phase displayed clear clustering patterns,reflecting a developmental trajectory from uniformity to diversity,and ultimately toward integration.While early angular measurement techniques appear to have emerged,they do not show evidence of sustained technical progression.Instead,different periods seem to have achieved similar levels of directional accuracy.The predominance of westward-facing tombs may be closely tied to both topographic features and the symbolic association with sunset.At the same time,cultural evolution and interregional exchange played essential roles in shaping the distinctive patterns of prehistoric tomb orientation.This research contributes not only to the understanding of ancient funerary practices but also demonstrates the potential of machine learning and artificial intelligence technologies in advancing archaeological analysis. 展开更多
关键词 Central China Neolithic Age tomb orientations machine learning human-environment interaction
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Multisensory virtual reality environments in architecture:The impact of smell on presence,engagement,and user experience
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作者 Muhammed YILDIRIM Anastasia GLOBA +1 位作者 Ozgur GOCER Arianna BRAMBILLA 《虚拟现实与智能硬件(中英文)》 2025年第6期577-617,共41页
Background Exploring how immersive technologies can simulate and assess user experiences in designed environments is an important topic in architectural research.In this study,a multisensory virtual reality(VR)system ... Background Exploring how immersive technologies can simulate and assess user experiences in designed environments is an important topic in architectural research.In this study,a multisensory virtual reality(VR)system developed to support the study of human-built environment interactions under multimodal conditions(visual,olfactory,and auditory)was evaluated.Methods The effectiveness of the system was tested by conducting in-depth user studies using a mixed-method approach to provide quantitative and qualitative evidence.The results of the case study were discussed,key features of the proposed prototype were assessed,and limitations and opportunities for future studies were identified.Results Findings showed that multisensory elements can deepen participants’sense of presence,increase engagement levels,and enrich overall user experience in immersive environments.Integrating olfactory stimuli into virtual representations of architectural spaces revealed how multisensory feedback informs spatial perception and supports the development of more responsive and human-centered design strategies.Conclusions This study contributes to the emerging field of sensory architecture,aiming to move beyond visual simulation toward a richer embodied understanding of space.The proposed approach provides valuable insights into the development of multisensory VR environments in architecture,enabling future research and immersive research methodologies in wider fields. 展开更多
关键词 Immersive virtual reality Multisensory experience Sense of smell human-environment interaction Multisensory VR in architecture User testing Mixed-method
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Landscape sustainability science and the Sustainable Development Goals
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作者 Jianguo(Jingle)Wu Julius Addai +4 位作者 Macharia Consolata Zening Gao Erica Martin Emily Sezate Yasutake Yucang Wang 《Geography and Sustainability》 2025年第5期1-9,共9页
Achieving Sustainable Development Goals(SDGs)requires place-based solutions that reconcile global aspirations with local realities.Landscapes and regions represent a pivotal scale domain—large enough to capture cross... Achieving Sustainable Development Goals(SDGs)requires place-based solutions that reconcile global aspirations with local realities.Landscapes and regions represent a pivotal scale domain—large enough to capture cross-boundary ecological and socioeconomic processes,yet sufficiently grounded to enable context-sensitive understanding and governance.Landscape sustainability science offers a robust framework for bridging the global-local divide in SDG implementation.Rooted in the long-standing convergence between ecology and geography—tracing back to Humboldt’s unity of nature—landscape sustainability science advances a spatially explicit,systems-oriented approach guided by the principles of strong sustainability.Here we present the landscape sustainability science framework,structured around the core triad of landscape pattern,ecosystem services,and human wellbeing,and operationalized through dual feedback loops and the analysis–adaptation–assessment cycle.Our assessment shows that landscape sustainability science contributes directly to eight SDGs and indirectly to six others,offering actionable strategies for climate resilience,sustainable land management,and inclusive landscape governance.By helping to spatialize,localize,and operationalize global sustainability targets,landscape sustainability science provides a pragmatic pathway to advance the SDGs in diverse socioecological contexts.If global sustainability is to be achieved,we must think and act like a landscape. 展开更多
关键词 Landscape sustainability science Sustainable Development Goals(SDGs) Integration between ecology and geography Coupled human-environment systems Ecosystem services and human wellbeing
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有机小分子硫堇与DNA相互作用的研究 被引量:15
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作者 冶保献 刘灵芳 +1 位作者 齐小花 王翠红 《分析科学学报》 CAS CSCD 北大核心 2003年第1期51-53,共3页
用光谱电化学和电化学技术研究了硫堇和硫堇与 DNA相互作用的电化学和光谱电化学性质 ,得出了硫堇作为有机小分子能插入 DNA双螺旋结构内部的结论 ,求得了对应的动力学参数。DNA的加入量与硫堇峰电流的降低呈一次线性关系 ,可望用于
关键词 有机小分子 DNA 硫堇 光谱电化学 相互作用
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不同竹龄雷竹中硅及其他营养元素吸收和积累特征 被引量:23
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作者 黄张婷 姜培坤 +2 位作者 宋照亮 孟赐福 吴家森 《应用生态学报》 CAS CSCD 北大核心 2013年第5期1347-1353,共7页
在浙江省临安市的雷竹主产区,分别采集不同竹龄(1~4 a)和不同器官(叶、枝、秆)的雷竹样品,分析了Si和其他营养元素含量、吸收和积累特征,以及Si和其他营养元素之间的相互关系.结果表明:雷竹各器官中C含量的大小顺序为竹秆>竹枝>... 在浙江省临安市的雷竹主产区,分别采集不同竹龄(1~4 a)和不同器官(叶、枝、秆)的雷竹样品,分析了Si和其他营养元素含量、吸收和积累特征,以及Si和其他营养元素之间的相互关系.结果表明:雷竹各器官中C含量的大小顺序为竹秆>竹枝>竹叶,Si、N、P、K、Ca、Mg、Al、Fe和Mn含量的大小顺序为竹叶>竹枝>竹秆.除Mn主要积累在竹叶中外,其他9种营养元素主要积累在1年生雷竹的秆中.3~4年生雷竹竹叶的Si平均含量为13.66 g·kg^(-1).雷竹属于Si积累植物.随竹龄的增加,雷竹叶中的N、P、K和Mg含量减少,C、Al和Mn含量增加.雷竹对Si的吸收主要集中在第2年(57.1%),对N和K的吸收主要集中在前两年(67.7%~93.7%),此后N和K从植株体内流出,其流失量分别占总积累量的19.1%~39.1%.雷竹中Si与Ca、Al、Mn呈显著正相关,与N、P、K、Mg呈显著负相关. 展开更多
关键词 雷竹 器官 营养元素 相互作用
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核磁共振方法研究瓜环[n](n=7,8)与枸橼酸西地那非的相互作用 被引量:6
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作者 杨春雪 朱卫国 +2 位作者 姜松 李新建 邹大鹏 《分析化学》 SCIE CAS CSCD 北大核心 2012年第3期478-481,共4页
利用1H NMR技术、电喷雾质谱、红外光谱以及紫外吸收光谱法等手段研究了瓜环[n](n=7,8)与枸橼酸西地那非的相互作用。结果表明:枸橼酸西地那非与两种瓜环都形成了1∶1的包结配合物,但是其配合物的作用模式随瓜环的大小而不同。通过计算... 利用1H NMR技术、电喷雾质谱、红外光谱以及紫外吸收光谱法等手段研究了瓜环[n](n=7,8)与枸橼酸西地那非的相互作用。结果表明:枸橼酸西地那非与两种瓜环都形成了1∶1的包结配合物,但是其配合物的作用模式随瓜环的大小而不同。通过计算得出瓜环[n](n=7,8)与枸橼酸西地那非的包结常数分别为958和1530 L/mol,说明瓜环对枸橼酸西地那非具有潜在的缓释作用。 展开更多
关键词 瓜环 枸橼酸西地那非 包结配合物 作用模式 核磁共振技术
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酚-镍污染下玉米幼苗中镍含量与酚类浓度、Kow的相关分析 被引量:2
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作者 郭栋生 袁小英 《农业环境保护》 CSCD 1997年第5期221-232,234,共13页
以砂培玉米幼苗为材料,研究了Ni污染下,不同浓度的酚、2-氯酚、2,4-二氯酚、2,4,6-三氯酚一次性污灌对玉米幼苗根、叶组织中镍含量的影响。结果表明:在50—250mg/L范围内,随着酚类化合物浓度的增高,幼苗根... 以砂培玉米幼苗为材料,研究了Ni污染下,不同浓度的酚、2-氯酚、2,4-二氯酚、2,4,6-三氯酚一次性污灌对玉米幼苗根、叶组织中镍含量的影响。结果表明:在50—250mg/L范围内,随着酚类化合物浓度的增高,幼苗根、叶组织中Ni含量增加;对于不同的酚类化合物,随着其Kow值的升高,对幼苗中Ni含量增加的影响越大。在上述酚类化合物浓度范围内,玉米幼苗根、叶中Ni的浓度与酚类化合物的Kow与浓度之间的关系可用下式表示:Y1(根Ni,mg/kg·DW)=192.37+52.95X1+1.64X2Y2(叶Ni,mg/kg·DW)=53.05+28.32X1+0. 展开更多
关键词 酚类化合物 玉米幼苗 相关分析
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煤炭开发中相关渗流力学问题研究 被引量:1
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作者 白国良 梁冰 《西安石油大学学报(自然科学版)》 CAS 2007年第2期153-156,共4页
煤碳是我国的主要能源,在能源消费结构中占居主导地位,煤岩体是一种典型的孔隙裂隙结构体,在煤炭资源开发的过程中涉及到一系列渗流力学问题.探讨了煤层中瓦斯渗流特征及其规律,分析了煤与瓦斯的流固耦合作用,介绍了煤与瓦斯突出的失稳... 煤碳是我国的主要能源,在能源消费结构中占居主导地位,煤岩体是一种典型的孔隙裂隙结构体,在煤炭资源开发的过程中涉及到一系列渗流力学问题.探讨了煤层中瓦斯渗流特征及其规律,分析了煤与瓦斯的流固耦合作用,介绍了煤与瓦斯突出的失稳判据;分析了煤矿生产过程中对地下水的污染,对酸性矿井水的水岩作用问题作了初步探讨,同时对煤矸石的环境效应也作了分析;随着煤层开采深度的增加,矿井热害越来越受到学者的重视,分析了矿井热害的形成机理及其影响因素.最后提出了煤层开采中渗流问题的研究方向. 展开更多
关键词 煤炭开发 渗流力学 流固耦合 水岩作用
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高薪未必养廉 低薪必然滋生腐败——明代禁贪败北的现代启迪 被引量:3
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作者 魏佐国 刘本锋 《宜春学院学报》 2010年第9期9-11,共3页
从大明律看,明统治者对贪污受贿之人处罚极其严厉,但终明一代,官员贪污现像却愈演愈烈。其根本原因是品官薪俸低微,严重影响政治生活。唯有满足官员最基本的生活需求,清正廉洁的政府才有建立的可能。
关键词 明代 品官薪俸 政治生活 关系
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维生素E与硒的抗氧化机理及其相互关系 被引量:4
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作者 宋智娟 赵国先 +1 位作者 张晓云 李岁寒 《中国饲料添加剂》 2005年第2期1-4,共4页
维生素E抗氧化作用机制是它能给脂类的自由基提供一个氢,与游离的电子发生作用,抑制自由基,从而制止脂质氧化的链式反应。硒是谷胱甘肽过氧化物酶的重要成分,抗氧化作用在于转化过氧化物为相关的醇类(或水)并能清除自由基。二者... 维生素E抗氧化作用机制是它能给脂类的自由基提供一个氢,与游离的电子发生作用,抑制自由基,从而制止脂质氧化的链式反应。硒是谷胱甘肽过氧化物酶的重要成分,抗氧化作用在于转化过氧化物为相关的醇类(或水)并能清除自由基。二者在动物营养中有协同作用,但不能互相替代。本文对维生素E和硒在抗氧化的机理和相互关系上加一综述。 展开更多
关键词 维生素E 抗氧化剂机理 相互关系
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固体非谐振热学性质的统计解释
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作者 刘国跃 《四川师范大学学报(自然科学版)》 CAS CSCD 1998年第6期678-683,共6页
固体非谐振性质是固体热学性质的重要方面,但却少有深入的分析.根据固体非谐振能量分布,对经典和量子两种行为采用统计力学方法作了较为深入的分析,并对相关问题作了讨论.
关键词 非谐振势能 热膨胀 固体 热学性质 统计物理
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花青素对不同直链淀粉含量的淀粉理化特性的影响 被引量:8
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作者 苗兰鸽 许燕 +3 位作者 赵思明 贾才华 牛猛 林亲录 《食品工业科技》 CAS 北大核心 2020年第14期22-28,共7页
低、中、高直链大米淀粉为原料,通过添加不同比例(0%、1%、2%、5%和10%)的花青素,研究花青素对淀粉理化特性的影响。结果表明,随着花青素含量的增加,淀粉的碘结合能力、表观黏度和黏弹性均降低,且这种降低趋势与直链淀粉含量相关。随着... 低、中、高直链大米淀粉为原料,通过添加不同比例(0%、1%、2%、5%和10%)的花青素,研究花青素对淀粉理化特性的影响。结果表明,随着花青素含量的增加,淀粉的碘结合能力、表观黏度和黏弹性均降低,且这种降低趋势与直链淀粉含量相关。随着花青素含量的增加,糊化温度、焓值逐渐降低,当花青素添加量为10%时,三种体系的糊化焓值分别下降23.92%、44.91%和59.89%;添加花青素的淀粉红外图谱与原淀粉相似,但在3400 cm^-1附近的吸收峰红移。此外,淀粉的结晶度随花青素的添加而呈现降低的趋势,当花青素添加量为10%时,三种体系的结晶度相对于原淀粉分别下降7.99%、15.49%和24.87%,通过扫描电镜的结果表明,添加花青素后淀粉的微观形貌呈现疏松多孔的性质。综上表明,花青素对淀粉的理化性质有明显的影响,且这一影响与淀粉中直链淀粉含量相关。本文通过研究花青素对淀粉理化特性的影响,可以为花青素在淀粉中的应用提供一定的理论依据。 展开更多
关键词 花青素 淀粉 结合能力 相互作用
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山西太原盆地全新世地貌演化及其对古人类聚落分布的影响 被引量:13
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作者 姜佳奇 莫多闻 +3 位作者 吕建晴 廖奕楠 鲁鹏 任小林 《古地理学报》 CAS CSCD 北大核心 2016年第5期895-904,共10页
人地关系是现代地理学重要的研究课题,其中地貌是影响古人类文化进程的重要因素。基于研究区野外地貌考察和沉积物的光释光年代测定,并利用地理信息系统分析技术,探讨山西省太原盆地全新世地貌演化过程、人类聚落分布变化规律及两者之... 人地关系是现代地理学重要的研究课题,其中地貌是影响古人类文化进程的重要因素。基于研究区野外地貌考察和沉积物的光释光年代测定,并利用地理信息系统分析技术,探讨山西省太原盆地全新世地貌演化过程、人类聚落分布变化规律及两者之间的关系。研究结果表明:从仰韶到夏商时期,太原盆地平原区一直是不适宜人类居住的河流和湖泊环境,而在盆地边缘有一圈环绕盆地的黄土台地,所以人类文化遗址一直呈环状分布于太原盆地边缘。晚更新世,盆地边缘以洪积过程为主,盆地中部以河流过程为主,形成了盆地边缘高、中间低的地势;晚更新世末期到全新世早期,由于盆地中部构造下陷与气候转变为暖湿的共同影响,盆地边缘地带下切形成黄土丘陵或台地。此时,太原盆地的仰韶文化遗址就分布在环盆地边缘的黄土台地和黄土丘陵上。到了龙山早期,盆地东侧中部陷落平原边缘地势稍高的地区,由于河流进一步下切而高出洪水水位,龙山早期先民开始进入这些地势稍高的平原地区活动;盆地西侧清徐—文水一带也转为下切,形成低台地,开始有人类在此台地上活动。到了龙山晚期,盆地平原区及各河流均发生向上加积,导致盆地平原区水位上升,洪水影响扩大到平原边缘地区,太谷—介休一带,龙山晚期先民开始退出平原地区。夏商时期,先民也从清徐—文水一带低台地上退出。约距今3ka之后,随着灵石隆起段汾河干流的下切,太原盆地边缘地带及中部平原区河流均有不同程度的下切,人类聚落才又开始向平原地区扩展。全新世太原盆地的地貌演化是影响古人类聚落分布的主要因素。 展开更多
关键词 人地关系 太原盆地 地貌演化 聚落分布
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基于肠道菌群探讨中医药抗衰老作用的研究进展 被引量:9
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作者 王沐晨 单思 +1 位作者 高鹏 刘红宁 《中华中医药杂志》 CAS CSCD 北大核心 2023年第2期718-721,共4页
衰老是一个全身性、渐进性、累积性、不可逆性的生命退化过程,随着人口老龄化的日益加剧,对延缓衰老的研究也一直方兴未艾。在衰老过程中肠道菌群的多样性、组成和功能发生显著的变化,提示调节肠道菌群的失调状态可能是抗衰老的有效途... 衰老是一个全身性、渐进性、累积性、不可逆性的生命退化过程,随着人口老龄化的日益加剧,对延缓衰老的研究也一直方兴未艾。在衰老过程中肠道菌群的多样性、组成和功能发生显著的变化,提示调节肠道菌群的失调状态可能是抗衰老的有效途径。中医药延缓衰老作用历史悠久,在调节肠道菌群方面发挥着重要作用,同时菌群也会对中药进行代谢从而更好地发挥药效。文章通过综述中药有效成分、单味药和复方制剂对肠道菌群抗衰老作用的研究,为中医药延缓衰老提供新思路和新方向。 展开更多
关键词 中医药 肠道菌群 衰老 相互作用 多样性
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体育教学与心理健康教育的关系小论 被引量:3
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作者 曹绍珍 刁元均 金兆江 《金融教育研究》 2006年第S1期290-,294,共2页
把握体育教学与心理健康教育的相互关系,抓住契机,在体育教学中不断更新教育观念,改变教学方法,积极渗透心理健康教育,促进学生心理健康发展。
关键词 体育教学 心理健康 相互关系
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高速列车桥上等速交会时的车-桥耦合振动特性研究 被引量:9
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作者 王亚朋 蔺鹏臻 +1 位作者 孙加林 李红梅 《铁道学报》 EI CAS CSCD 北大核心 2021年第5期169-176,共8页
为研究桥上高速列车等速交会时气动风压荷载对车-桥耦合系统的影响,基于三维非稳态湍流理论和多体系统动力学理论,建立考虑交会压力波的车-桥耦合动力学模型。以某高速列车在40 m简支梁桥上交会为例,结合该类型桥梁适应更高速度发展的需... 为研究桥上高速列车等速交会时气动风压荷载对车-桥耦合系统的影响,基于三维非稳态湍流理论和多体系统动力学理论,建立考虑交会压力波的车-桥耦合动力学模型。以某高速列车在40 m简支梁桥上交会为例,结合该类型桥梁适应更高速度发展的需求,对桥上列车等速交会时车-桥系统的车辆安全性、平稳性指标及桥梁位移、冲击系数、加速度等进行了数值模拟研究。研究结果表明:车辆系统各指标随交会速度的增大而增大,而桥梁系统竖向位移、冲击系数随交会速度先减小后增大,其他指标随交会速度的增大而增大;交会风压对车辆竖向动力响应影响较横向动力响应大,对桥梁系统的影响较小。对于本算例车-桥耦合系统,以车体横向加速度、车体横向Sperling为评价指标,高速动车组明线等速交会时速度控制在450 km/h以内较为安全。考虑桥上列车高速交会后,桥梁冲击系数将大于现有规范取值。 展开更多
关键词 高速铁路 桥梁 车桥耦合振动 交会 空气压力波 有限元
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