This paper sought to surface visualizations of“older adult selves”(OAS)of junior college students studying development communication after an interaction with older adults in Bagac,Bataan in the Philippines.It was d...This paper sought to surface visualizations of“older adult selves”(OAS)of junior college students studying development communication after an interaction with older adults in Bagac,Bataan in the Philippines.It was done to figure out the ways by which such visualizations could be achieved through institutional efforts within an academic setting.Twenty-three students,mostly females who volunteered to participate in a reflection paper writing activity a week after the youth-older adult interaction,wrote their visions or projections of their life as older adults informed by their social exchanges with older adults in a rural community in the Philippines(Bagac,Bataan).The results indicated that an image of the well-connected older adult was shared across all narratives and it is characterized by youthfulness,openness and flexibility,and sense of accomplishment.Necessary conditions were drawn out from the data to help facilitate the fulfillment of such visions through the possible initiatives of St.Paul University Manila.展开更多
Abdominal aortic aneurysm is a common vascular disease that affects elderly population.Open surgical repair is regarded as the gold standard technique for treatment of abdominal aortic aneurysm,however,endovaseular an...Abdominal aortic aneurysm is a common vascular disease that affects elderly population.Open surgical repair is regarded as the gold standard technique for treatment of abdominal aortic aneurysm,however,endovaseular aneurysm repair has rapidly expanded since its first introduction in 1990s.As a less invasive technique,endovascular aneurysm repair has been confirmed to be an effective alternative to open surgical repair,especially in patients with co-morbid conditions.Computed tomography （CT） angiography is currently the preferred imaging modality for both preoperative planning and post-operative follow-up.2D CT images are complemented by a number of 3D reconstructions which enhance the diagnostic applications of CT angiography in both planning and follow-up of endovascular repair.CT has the disadvantage of high cummulative radiation dose,of particular concern in younger patients,since patients require regular imaging follow-ups after endovascular repair,thus,exposing patients to repeated radiation exposure for life.There is a trend to change from CT to ultrasound surveillance of endovascular aneurysm repair.Medical image visualizations demonstrate excellent morphological assessment of aneurysm and stent-grafts,but fail to provide hemodynamic changes caused by the complex stent-graft device that is implanted into the aorta.This article reviews the treatment options of abdominal aortic aneurysm,various image visualization tools,and follow-up procedures with use of different modalities including both imaging and computational fluid dynamics methods.Future directions to improve treatment outcomes in the follow-up of endovascular aneurysm repair are outlined.展开更多
The visualization of dynamic graphs is a challenging task owing to the various properties of the underlying relational data and the additional time-varying property.For sparse and small graphs,the most efficient appro...The visualization of dynamic graphs is a challenging task owing to the various properties of the underlying relational data and the additional time-varying property.For sparse and small graphs,the most efficient approach to such visualization is node-link diagrams,whereas for dense graphs with attached data,adjacency matrices might be the better choice.Because graphs can contain both properties,being globally sparse and locally dense,a combination of several visual metaphors as well as static and dynamic visualizations is beneficial.In this paper,a visually and algorithmically scalable approach that provides views and perspectives on graphs as interactively linked node-link and adjacency matrix visualizations is described.As the novelty of this technique,insights such as clusters or anomalies from one or several combined views can be used to influence the layout or reordering of the other views.Moreover,the importance of nodes and node groups can be detected,computed,and visualized by considering several layout and reordering properties in combination as well as different edge properties for the same set of nodes.As an additional feature set,an automatic identification of groups,clusters,and outliers is provided over time,and based on the visual outcome of the node-link and matrix visualizations,the repertoire of the supported layout and matrix reordering techniques is extended,and more interaction techniques are provided when considering the dynamics of the graph data.Finally,a small user experiment was conducted to investigate the usability of the proposed approach.The usefulness of the proposed tool is illustrated by applying it to a graph dataset,such as e co-authorships,co-citations,and a Comprehensible Perl Archive Network distribution.展开更多
Excessive unplanned urban growth leads to many vulnerabilities and impacts on urban environments to varying degrees. However, the majority of the extant literature focuses on the problems related to location and socio...Excessive unplanned urban growth leads to many vulnerabilities and impacts on urban environments to varying degrees. However, the majority of the extant literature focuses on the problems related to location and socioeconomic conditions, rather than vulnerability processes and related environmental degradation. This paper analyzes the scope of urban vulnerabilities for five rapidly urbanizing and highly-congested cities in the Kathmandu Valley, Nepal. First, the historic context of the Valley’s uncontrolled urbanization sets the scene. Second, the optic is narrowed to focus upon the geographical features of the resultant urbanized Valley landscape that includes spatial arrangements and of houses, population densities, road networks, vehicular densities, garbage problems, and available open spaces. Additionally, seismic vulnerabilities in the urban areas are also considering in this examination. Third, three-dimensional visualizations of selected urban locations are presented to differentiate between vulnerable and relatively safe locations. The intent of this research is to contribute to the methodological understanding of human/hazards interactions in rapidly urbanizing cities of the Third World, which share similar socioeconomic conditions and environmental con-texts.展开更多
Infill development has been seen as one of the solutions to urban challenges. However, it changes the dynamics and visual appearance of the neighborhood. As infill development usually requires the acceptance of local ...Infill development has been seen as one of the solutions to urban challenges. However, it changes the dynamics and visual appearance of the neighborhood. As infill development usually requires the acceptance of local stakeholders, their perceptions of the resulting intensified housing have a significant role. In this study, customized visualizations illustrating scenarios of infill development were made from the perspective of individual apartments in neighboring residential building. The usefulness of customized visualizations for local stakeholders was studied in the Tammela test area. A 3D virtual model of the existing environment was created. Models depicting the alternative infill buildings were added to the 3D model, which was used to create customized visualizations. These visualizations were utilized in the interviews of local stakeholders. The findings indicate that the customized visualizations help stakeholders conceptualize the impact, and plan and manage the infill development. Visualizations can also be seen as a tool for a resident-driven approach to intensifying housing.展开更多
Understanding which factors affect information visualization transparency continues to be one of the most relevant challenges in current research,especially since trust models how users build on the knowledge and use ...Understanding which factors affect information visualization transparency continues to be one of the most relevant challenges in current research,especially since trust models how users build on the knowledge and use it.This work extends the current body of research by studying the user’s subjective evaluation of the visualization transparency of hierarchical charts through the clarity,coverage,and look and feel dimensions.Additionally,we extend the user profile to better understand whether personality facets manifest a biasing effect on the trust-building process.Our results show that the data encodings do not affect how users perceive visualization transparency while controlling for personality factors.Regarding personality,the propensity to trust affects how they judge the clarity of a hierarchical chart.Our findings provide new insights into the research challenges of measuring trust and understanding the transparency of information visualization.Specifically,we explore how personality factors manifest in this trust-building relationship and user interaction within visualization systems.展开更多
Recent studies have indicated that foundation models, such as BERT and GPT, excel atadapting to various downstream tasks. This adaptability has made them a dominant force in buildingartificial intelligence (AI) system...Recent studies have indicated that foundation models, such as BERT and GPT, excel atadapting to various downstream tasks. This adaptability has made them a dominant force in buildingartificial intelligence (AI) systems. Moreover, a newresearch paradigm has emerged as visualizationtechniques are incorporated into these models. Thisstudy divides these intersections into two researchareas: visualization for foundation model (VIS4FM)and foundation model for visualization (FM4VIS).In terms of VIS4FM, we explore the primary roleof visualizations in understanding, refining, and evaluating these intricate foundation models. VIS4FMaddresses the pressing need for transparency, explainability, fairness, and robustness. Conversely, in termsof FM4VIS, we highlight how foundation models canbe used to advance the visualization field itself. Theintersection of foundation models with visualizations ispromising but also introduces a set of challenges. Byhighlighting these challenges and promising opportunities, this study aims to provide a starting point forthe continued exploration of this research avenue.展开更多
VECTOR EFFECT OF MICROPLASTIC PARTICLES.The microplastic pollution issue is infamous for its enormous multidimensionality and the intricate combination arising from plastics themselves and“plasticassociated chemicals...VECTOR EFFECT OF MICROPLASTIC PARTICLES.The microplastic pollution issue is infamous for its enormous multidimensionality and the intricate combination arising from plastics themselves and“plasticassociated chemicals.”Interactions between microplastic particles with multiple chemicals can affect biological health and alter the toxicity of the primary environmental pollutants.These complex combinations raise great challenges to experimental design for toxicity evaluation,going beyond the investigation of individual or dual contaminations.Systematic research and an integrated visualization strategy are needed to decipher these biochemical processes and molecular mechanisms.1,2.展开更多
Incidental visualizations convey information to a person during an ongoing primary task,without the person consciously searching for or requesting that information.They differ from glanceable visualizations by not bei...Incidental visualizations convey information to a person during an ongoing primary task,without the person consciously searching for or requesting that information.They differ from glanceable visualizations by not being people’s main focus,and from ambient visualizations by not being embedded in the environment.Instead,they are presented as secondary information that can be observed without a person losing focus on their current task.However,despite extensive research on glanceable and ambient visualizations,the topic of incidental visualizations is yet a novel topic in current research.To bridge this gap,we conducted an empirical user study presenting participants with an incidental visualization while performing a primary task.We aimed to understand how complexity contributory factors—task complexity,output complexity,and pressure—affected primary task performance and incidental visualization accuracy.Our findings showed that incidental visualizations effectively conveyed information without disrupting the primary task,but working memory limitations should be considered.Additionally,output and pressure significantly influenced the primary task’s results.In conclusion,our study provides insights into the perception accuracy and performance impact of incidental visualizations in relation to complexity factors.展开更多
Fine art authentication plays a significant role in protecting cultural heritage and ensuring the integrity of artworks.Traditional authentication methods require professionals to collect many reference materials and ...Fine art authentication plays a significant role in protecting cultural heritage and ensuring the integrity of artworks.Traditional authentication methods require professionals to collect many reference materials and conduct detailed analyses.To ease the difficulty,we collaborate with domain experts to develop a GPT-based agent,namely ArtEyer,that offers accurate attributions,determines the origin and authorship,and executes visual analytics.Despite the convenience of the conversational user interface,novice users may still face challenges due to the hallucination issue and the steep learning curve associated with prompting.To face these obstacles,we propose a novel solution that places interactive data visualizations into the conversations.We create contextual visualizations from an external domain-dependent database to ensure data trustworthiness and allow users to provide precise instructions to the agent by interacting directly with these visualizations,thus overcoming the vagueness inherent in natural language-based prompting.We evaluate ArtEyer through an in-lab user study and demonstrate its usage with a real-world case.展开更多
气候变化和人类活动对水文循环产生了显著影响,尤其是在干旱半干旱区.为探究变化环境下典型半干旱生态脆弱区毛乌素沙地水循环演变特征,利用WEP-L(water and energy transfer processes in large river basin)地表水模型和Visual MODFLO...气候变化和人类活动对水文循环产生了显著影响,尤其是在干旱半干旱区.为探究变化环境下典型半干旱生态脆弱区毛乌素沙地水循环演变特征,利用WEP-L(water and energy transfer processes in large river basin)地表水模型和Visual MODFLOW(visual modular finite difference groundwater flow)地下水模型对毛乌素沙地水循环过程进行分布式模拟,基于白家川水文站实测月径流量和监测井地下水位数据进行模型参数率定与验证.结果表明,地表水模型率定期和验证期的模拟月径流量和实测月径流量的R2都在0.5以上,模拟的监测井地下水位和实测地下水位趋势较为一致,相关系数达到0.56以上.采用偏差校正的CMIP6多模式集合气候变化情景及当地取用水情景驱动地表水-地下水耦合模型,量化了变化环境下毛乌素沙地2021-2040年关键水循环要素变化特征.结果表明,未来情景下毛乌素沙地年降水量和年蒸散发量的平均增幅分别为8.0%和7.4%,年径流深呈现逐渐减少的趋势,2040年末地下水位相较于2021年末下降了约1 m.未来2种用水情景下区域地下水总补给量与排泄量的差值分别为-1.82亿、-0.97亿m^(3)·a^(-1),地表径流总量与地表用水量的差值分别为1.83亿、2.29亿m^(3)·a^(-1),地下水资源开发利用将面临更大挑战.研究成果可为毛乌素沙地区域水资源规划与管理提供科学支撑.展开更多
Understanding the neural underpinning of human gait and balance is one of the most pertinent challenges for 21st-century translational neuroscience due to the profound impact that falls and mobility disturbances have ...Understanding the neural underpinning of human gait and balance is one of the most pertinent challenges for 21st-century translational neuroscience due to the profound impact that falls and mobility disturbances have on our aging population.Posture and gait control does not happen automatically,as previously believed,but rather requires continuous involvement of central nervous mechanisms.To effectively exert control over the body,the brain must integrate multiple streams of sensory information,including visual,vestibular,and somatosensory signals.The mechanisms which underpin the integration of these multisensory signals are the principal topic of the present work.Existing multisensory integration theories focus on how failure of cognitive processes thought to be involved in multisensory integration leads to falls in older adults.Insufficient emphasis,however,has been placed on specific contributions of individual sensory modalities to multisensory integration processes and cross-modal interactions that occur between the sensory modalities in relation to gait and balance.In the present work,we review the contributions of somatosensory,visual,and vestibular modalities,along with their multisensory intersections to gait and balance in older adults and patients with Parkinson’s disease.We also review evidence of vestibular contributions to multisensory temporal binding windows,previously shown to be highly pertinent to fall risk in older adults.Lastly,we relate multisensory vestibular mechanisms to potential neural substrates,both at the level of neurobiology(concerning positron emission tomography imaging)and at the level of electrophysiology(concerning electroencephalography).We hope that this integrative review,drawing influence across multiple subdisciplines of neuroscience,paves the way for novel research directions and therapeutic neuromodulatory approaches,to improve the lives of older adults and patients with neurodegenerative diseases.展开更多
文摘This paper sought to surface visualizations of“older adult selves”(OAS)of junior college students studying development communication after an interaction with older adults in Bagac,Bataan in the Philippines.It was done to figure out the ways by which such visualizations could be achieved through institutional efforts within an academic setting.Twenty-three students,mostly females who volunteered to participate in a reflection paper writing activity a week after the youth-older adult interaction,wrote their visions or projections of their life as older adults informed by their social exchanges with older adults in a rural community in the Philippines(Bagac,Bataan).The results indicated that an image of the well-connected older adult was shared across all narratives and it is characterized by youthfulness,openness and flexibility,and sense of accomplishment.Necessary conditions were drawn out from the data to help facilitate the fulfillment of such visions through the possible initiatives of St.Paul University Manila.
文摘Abdominal aortic aneurysm is a common vascular disease that affects elderly population.Open surgical repair is regarded as the gold standard technique for treatment of abdominal aortic aneurysm,however,endovaseular aneurysm repair has rapidly expanded since its first introduction in 1990s.As a less invasive technique,endovascular aneurysm repair has been confirmed to be an effective alternative to open surgical repair,especially in patients with co-morbid conditions.Computed tomography （CT） angiography is currently the preferred imaging modality for both preoperative planning and post-operative follow-up.2D CT images are complemented by a number of 3D reconstructions which enhance the diagnostic applications of CT angiography in both planning and follow-up of endovascular repair.CT has the disadvantage of high cummulative radiation dose,of particular concern in younger patients,since patients require regular imaging follow-ups after endovascular repair,thus,exposing patients to repeated radiation exposure for life.There is a trend to change from CT to ultrasound surveillance of endovascular aneurysm repair.Medical image visualizations demonstrate excellent morphological assessment of aneurysm and stent-grafts,but fail to provide hemodynamic changes caused by the complex stent-graft device that is implanted into the aorta.This article reviews the treatment options of abdominal aortic aneurysm,various image visualization tools,and follow-up procedures with use of different modalities including both imaging and computational fluid dynamics methods.Future directions to improve treatment outcomes in the follow-up of endovascular aneurysm repair are outlined.
文摘The visualization of dynamic graphs is a challenging task owing to the various properties of the underlying relational data and the additional time-varying property.For sparse and small graphs,the most efficient approach to such visualization is node-link diagrams,whereas for dense graphs with attached data,adjacency matrices might be the better choice.Because graphs can contain both properties,being globally sparse and locally dense,a combination of several visual metaphors as well as static and dynamic visualizations is beneficial.In this paper,a visually and algorithmically scalable approach that provides views and perspectives on graphs as interactively linked node-link and adjacency matrix visualizations is described.As the novelty of this technique,insights such as clusters or anomalies from one or several combined views can be used to influence the layout or reordering of the other views.Moreover,the importance of nodes and node groups can be detected,computed,and visualized by considering several layout and reordering properties in combination as well as different edge properties for the same set of nodes.As an additional feature set,an automatic identification of groups,clusters,and outliers is provided over time,and based on the visual outcome of the node-link and matrix visualizations,the repertoire of the supported layout and matrix reordering techniques is extended,and more interaction techniques are provided when considering the dynamics of the graph data.Finally,a small user experiment was conducted to investigate the usability of the proposed approach.The usefulness of the proposed tool is illustrated by applying it to a graph dataset,such as e co-authorships,co-citations,and a Comprehensible Perl Archive Network distribution.
文摘Excessive unplanned urban growth leads to many vulnerabilities and impacts on urban environments to varying degrees. However, the majority of the extant literature focuses on the problems related to location and socioeconomic conditions, rather than vulnerability processes and related environmental degradation. This paper analyzes the scope of urban vulnerabilities for five rapidly urbanizing and highly-congested cities in the Kathmandu Valley, Nepal. First, the historic context of the Valley’s uncontrolled urbanization sets the scene. Second, the optic is narrowed to focus upon the geographical features of the resultant urbanized Valley landscape that includes spatial arrangements and of houses, population densities, road networks, vehicular densities, garbage problems, and available open spaces. Additionally, seismic vulnerabilities in the urban areas are also considering in this examination. Third, three-dimensional visualizations of selected urban locations are presented to differentiate between vulnerable and relatively safe locations. The intent of this research is to contribute to the methodological understanding of human/hazards interactions in rapidly urbanizing cities of the Third World, which share similar socioeconomic conditions and environmental con-texts.
基金The Academy of FinlandThe Centre of Excellence in Laser Scanning Research (CoE-LaSR) (272195)+5 种基金Research on Resident-Driven Infill Development Possibilities—Case Study in Urban Areas in Finland (REPSU) (255390)The Finnish Funding Agency for Innovation “A healthy building”—project (40250/14) The Aalto Energy Efficiency Research Programme (Light Energy—Efficient and Safe Traffic Environments project)The EUE project (2141226) The Aalto University doctoral program
文摘Infill development has been seen as one of the solutions to urban challenges. However, it changes the dynamics and visual appearance of the neighborhood. As infill development usually requires the acceptance of local stakeholders, their perceptions of the resulting intensified housing have a significant role. In this study, customized visualizations illustrating scenarios of infill development were made from the perspective of individual apartments in neighboring residential building. The usefulness of customized visualizations for local stakeholders was studied in the Tammela test area. A 3D virtual model of the existing environment was created. Models depicting the alternative infill buildings were added to the 3D model, which was used to create customized visualizations. These visualizations were utilized in the interviews of local stakeholders. The findings indicate that the customized visualizations help stakeholders conceptualize the impact, and plan and manage the infill development. Visualizations can also be seen as a tool for a resident-driven approach to intensifying housing.
基金reviewed and approved by The Ethics Commit-tee of Instituto Superior TécnicoThe reference number for thisapproval is 22/2021(CE-IST).
文摘Understanding which factors affect information visualization transparency continues to be one of the most relevant challenges in current research,especially since trust models how users build on the knowledge and use it.This work extends the current body of research by studying the user’s subjective evaluation of the visualization transparency of hierarchical charts through the clarity,coverage,and look and feel dimensions.Additionally,we extend the user profile to better understand whether personality facets manifest a biasing effect on the trust-building process.Our results show that the data encodings do not affect how users perceive visualization transparency while controlling for personality factors.Regarding personality,the propensity to trust affects how they judge the clarity of a hierarchical chart.Our findings provide new insights into the research challenges of measuring trust and understanding the transparency of information visualization.Specifically,we explore how personality factors manifest in this trust-building relationship and user interaction within visualization systems.
基金supported by the National Natural Science Foundation of China(Grant Nos.U21A20469 and 61936002)the National Key R&D Program of China(Grant No.2020YFB2104100)grants from the Institute Guo Qiang,THUIBCS,and BLBCI.
文摘Recent studies have indicated that foundation models, such as BERT and GPT, excel atadapting to various downstream tasks. This adaptability has made them a dominant force in buildingartificial intelligence (AI) systems. Moreover, a newresearch paradigm has emerged as visualizationtechniques are incorporated into these models. Thisstudy divides these intersections into two researchareas: visualization for foundation model (VIS4FM)and foundation model for visualization (FM4VIS).In terms of VIS4FM, we explore the primary roleof visualizations in understanding, refining, and evaluating these intricate foundation models. VIS4FMaddresses the pressing need for transparency, explainability, fairness, and robustness. Conversely, in termsof FM4VIS, we highlight how foundation models canbe used to advance the visualization field itself. Theintersection of foundation models with visualizations ispromising but also introduces a set of challenges. Byhighlighting these challenges and promising opportunities, this study aims to provide a starting point forthe continued exploration of this research avenue.
基金supported by the National Natural Science Foundation of China(22176195,82127801,22104120,22376212,and 31901040)the National Key R&D Program of China(2022YFF0705003)+4 种基金the Guangdong Province Zhu Jiang Talents Plan(2021QN02Y028)the Shenzhen Key Laboratory of Precision Diagnosis and Treatment of Depression(ZDSYS20220606100606014)the Shenzhen Medical Research Fund(D2301001)the Three Qin Talents Introduction Program for Youths of Shaanxi Province,the“Young Talent Support Plan”of Xi’an Jiaotong University,the Guangdong Science and Technology Department(2021B1212030004)Fundamental Research Funds for the Central Universities(xtr052023008).
文摘VECTOR EFFECT OF MICROPLASTIC PARTICLES.The microplastic pollution issue is infamous for its enormous multidimensionality and the intricate combination arising from plastics themselves and“plasticassociated chemicals.”Interactions between microplastic particles with multiple chemicals can affect biological health and alter the toxicity of the primary environmental pollutants.These complex combinations raise great challenges to experimental design for toxicity evaluation,going beyond the investigation of individual or dual contaminations.Systematic research and an integrated visualization strategy are needed to decipher these biochemical processes and molecular mechanisms.1,2.
基金This work was supported by FCT,through grants:PTDC/CCI-CIF/28939/2017,UIDB/50021/2020,SFRH/BD/143496/2019。
文摘Incidental visualizations convey information to a person during an ongoing primary task,without the person consciously searching for or requesting that information.They differ from glanceable visualizations by not being people’s main focus,and from ambient visualizations by not being embedded in the environment.Instead,they are presented as secondary information that can be observed without a person losing focus on their current task.However,despite extensive research on glanceable and ambient visualizations,the topic of incidental visualizations is yet a novel topic in current research.To bridge this gap,we conducted an empirical user study presenting participants with an incidental visualization while performing a primary task.We aimed to understand how complexity contributory factors—task complexity,output complexity,and pressure—affected primary task performance and incidental visualization accuracy.Our findings showed that incidental visualizations effectively conveyed information without disrupting the primary task,but working memory limitations should be considered.Additionally,output and pressure significantly influenced the primary task’s results.In conclusion,our study provides insights into the perception accuracy and performance impact of incidental visualizations in relation to complexity factors.
基金This document contains the results of the research project funded by the National Social Science Fund of China (19ZDA046)NSF of China (62302440,U22A2032)+1 种基金China Postdoctoral Science Foundation (2023TQ0288)the Fundamental Research Funds for the Central Universities,China.
文摘Fine art authentication plays a significant role in protecting cultural heritage and ensuring the integrity of artworks.Traditional authentication methods require professionals to collect many reference materials and conduct detailed analyses.To ease the difficulty,we collaborate with domain experts to develop a GPT-based agent,namely ArtEyer,that offers accurate attributions,determines the origin and authorship,and executes visual analytics.Despite the convenience of the conversational user interface,novice users may still face challenges due to the hallucination issue and the steep learning curve associated with prompting.To face these obstacles,we propose a novel solution that places interactive data visualizations into the conversations.We create contextual visualizations from an external domain-dependent database to ensure data trustworthiness and allow users to provide precise instructions to the agent by interacting directly with these visualizations,thus overcoming the vagueness inherent in natural language-based prompting.We evaluate ArtEyer through an in-lab user study and demonstrate its usage with a real-world case.
文摘气候变化和人类活动对水文循环产生了显著影响,尤其是在干旱半干旱区.为探究变化环境下典型半干旱生态脆弱区毛乌素沙地水循环演变特征,利用WEP-L(water and energy transfer processes in large river basin)地表水模型和Visual MODFLOW(visual modular finite difference groundwater flow)地下水模型对毛乌素沙地水循环过程进行分布式模拟,基于白家川水文站实测月径流量和监测井地下水位数据进行模型参数率定与验证.结果表明,地表水模型率定期和验证期的模拟月径流量和实测月径流量的R2都在0.5以上,模拟的监测井地下水位和实测地下水位趋势较为一致,相关系数达到0.56以上.采用偏差校正的CMIP6多模式集合气候变化情景及当地取用水情景驱动地表水-地下水耦合模型,量化了变化环境下毛乌素沙地2021-2040年关键水循环要素变化特征.结果表明,未来情景下毛乌素沙地年降水量和年蒸散发量的平均增幅分别为8.0%和7.4%,年径流深呈现逐渐减少的趋势,2040年末地下水位相较于2021年末下降了约1 m.未来2种用水情景下区域地下水总补给量与排泄量的差值分别为-1.82亿、-0.97亿m^(3)·a^(-1),地表径流总量与地表用水量的差值分别为1.83亿、2.29亿m^(3)·a^(-1),地下水资源开发利用将面临更大挑战.研究成果可为毛乌素沙地区域水资源规划与管理提供科学支撑.
文摘Understanding the neural underpinning of human gait and balance is one of the most pertinent challenges for 21st-century translational neuroscience due to the profound impact that falls and mobility disturbances have on our aging population.Posture and gait control does not happen automatically,as previously believed,but rather requires continuous involvement of central nervous mechanisms.To effectively exert control over the body,the brain must integrate multiple streams of sensory information,including visual,vestibular,and somatosensory signals.The mechanisms which underpin the integration of these multisensory signals are the principal topic of the present work.Existing multisensory integration theories focus on how failure of cognitive processes thought to be involved in multisensory integration leads to falls in older adults.Insufficient emphasis,however,has been placed on specific contributions of individual sensory modalities to multisensory integration processes and cross-modal interactions that occur between the sensory modalities in relation to gait and balance.In the present work,we review the contributions of somatosensory,visual,and vestibular modalities,along with their multisensory intersections to gait and balance in older adults and patients with Parkinson’s disease.We also review evidence of vestibular contributions to multisensory temporal binding windows,previously shown to be highly pertinent to fall risk in older adults.Lastly,we relate multisensory vestibular mechanisms to potential neural substrates,both at the level of neurobiology(concerning positron emission tomography imaging)and at the level of electrophysiology(concerning electroencephalography).We hope that this integrative review,drawing influence across multiple subdisciplines of neuroscience,paves the way for novel research directions and therapeutic neuromodulatory approaches,to improve the lives of older adults and patients with neurodegenerative diseases.
