检索结果-南通市图书馆

Insight into the bimetallic structure sensibility of catalytic nitrate reduction over Pd-Cu nanocrystals

Journal of Environmental Sciences 2025年第3期149卷 221-233页

作者： Zhiqiang Zhang Wenhang Li Cailin Zheng Kunyu Chen Heliang Pang Wenxin Shi Jinsuo Lu School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Key Laboratory of Northwest Water Resources Environment and EcologyMinistry of EducationXian 710055China State Key Laboratory of urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China Construction engineering quality and safety supervision center station House and Urban Rural Development Department of AnkangAnkang 725000China College of urban Construction and Environmental Engineering Chongqing UniversityChongqing 400044China

Catalytic reduction of nitrate over bimetallic catalysts has emerged as a technology for sustainable treatment of nitrate-containing ***,the structure of bimetallic has been much less investigated for catalyst ***,two main types of Pd-Cu bimetallic nanocrystal structures,heterostructure and intermetallic,were prepared and characterized using high-resolution transmission electron microscopy(HRTEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS).The results show that two individual Pd and Cu nanocrystals with a mixed interface exist in the heterostructure nanocrystals,while Pd and Cu atoms are uniformly distributed across the intermetallic Pd-Cu *** catalytic nitrate reduction experiments were carried out in a semibatch reactor under constant hydrogen *** nitrate conversion rate of the heterostructure Pd-Cu nanocrystals supported onα-Al_(2)O_(3),γ-Al_(2)O_(3),SBA-15,and XC-72R exhibited 3.82-,6.76-,4.28-,2.44-fold enhancements relative to the intermetallic nanocrystals,and the nitrogen and nitrite were the main products for the heterostructure and intermetallic Pd-Cu nanocrystals,*** indicates that the catalytic nitrate reduction over Pd-Cu catalyst is sensitive to the bimetallic structures of the catalysts,and heterostructure bimetallic nanocrystals exhibit better catalytic performances on both the activity and selectivity,which may provide new insights into the design and optimization of catalysts to improve catalytic activity and selectivity for nitrate reduction in water.

关键词： Catalytic nitrate reduction Pd-Cu bimetallic catalyst Heterostructure Intermetallic Activity and selectivity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

How sediment dredging alters phosphorus dynamics in a lowland rural river?

引用

Journal of Environmental Sciences 2025年第1期147卷 189-199页

作者： Qimou Zhang Jiacong Huang Yulai Ji Jing Zhang Shuai Zhang Junfeng Gao Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese academy of Sciences Beijing 10094China

china’s lowland rural rivers are facing severe eutrophication problems due to excessive phosphorus(P)from anthropogenic ***,quantifying P dynamics in a lowland rural river is challenging due to its complex interaction with surrounding areas.A P dynamic model(River-P)was specifically designed for lowland rural rivers to address this *** modelwas coupled with the Environmental Fluid Dynamics Code(EFDC)and the Phosphorus Dynamic Model for lowland Polder systems(PDP)to characterize P dynamics under the impact of dredging in a lowland rural *** on a two-year(2020-2021)dataset from a representative lowland rural river in the Lake Taihu Basin,china,the coupled model was calibrated and achieved a model performance(R^(2)>0.59,RMSE<0.04 mg/L)for total P(TP)*** research in the study river revealed that(1)the time scale for the effectiveness of sediment dredging for P control was~300 days,with an increase in P retention capacity by 74.8 kg/year and a decrease in TP concentrations of 23%after dredging.(2)Dredging significantly reduced P release from sediment by 98%,while increased P resuspension and settling capacities by 16%and 46%,respectively.(3)The sediment-water interface(SWI)plays a critical role in P transfer within the river,as resuspension accounts for 16%of TP imports,and settling accounts for 47%of TP *** the large P retention capacity of lowland rural rivers,drainage ditches and ponds with macrophytes are promising approaches to enhance P retention *** study provides valuable insights for local environmental departments,allowing a comprehensive understanding of P dynamics in lowland rural *** enable the evaluation of the efficacy of sediment dredging in P control and the implementation of corresponding P control measures.

关键词： Lowland rural river Phosphorus Sediment dredging Model ensemble Retention capacity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

HUST-CRA:A New Atmospheric De-Aliasing Model for Satellite Gravimetry

引用

Advances in Atmospheric Sciences 2025年第2期42卷 382-396页

作者： Weihang ZHANG Fan YANG Yi WU Hailong LIU Tao ZHANG Zhicai LUO Ehsan FOROOTAN School of Physics Huazhong University of Science and TechnologyWuhan 430074China Geodesy Group Department of Sustainability and PlanningAalborg UniversityAalborg 9000Denmark Laoshan Laboratory Qingdao 266237China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China National Meteorological Information Center China Meteorological Administration(CMA)Beijing 100081China

Atmospheric de-aliasing is one of the most important background models for recovering Earth's temporal gravity field from gravity satellite *** meet the needs of china's gravimetric satellite platform,an independent atmospheric dealiasing model that relies on Chinese meteorological data needs to be *** release of CRA-40,as the firstgeneration Chinese atmospheric reanalysis,provides the *** study proposes a revised modeling method to calibrate CRA-40 and develops a new atmospheric de-aliasing model(HUST-CRA,2002-20).Intensive assessments are made between HUST-CRA and the latest official de-aliasing product of the international gravity satellite *** tidal components of the two products demonstrate high consistency,e.g.,the spatial correlation for the major tide S_1 is *** non-tidal components of the two products are also equivalent:(1)the temporal correlation of low-degree terms is higher than 0.97,except for the term of S22(0.93);(2)the spectral correlation of degree geoid height up to degree/order 100 is as high as 0.99;(3)the confidence interval of the spatial correlation(2002-20)is[0.971,0.995]at a confidence level of 95%;and(4)the difference in KBRR(K-band range rate)residuals is less than 0.08μm s^(-1),the difference in the derived temporal gravity field is less than 0.32 mm in terms of geoid height,and both are apparently beyond the ability of the current gravity satellite *** confirms that CRA-40 is of high quality and that the derived de-aliasing product,HUST-CRA,is accurate enough to be used in both Chinese and international gravity satellite missions.

关键词： CRA-40 atmospheric de-aliasing gravity satellite temporal gravity field

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Territorial Ecological Restoration with a High-carbon Storage Focus in the Beibu Gulf urban Agglomeration of china:Insights from Carbon Metabolism Spatial Security Patterns

引用

Chinese Geographical Science 2025年第1期35卷 73-91页

作者： QIN Menglin LIU Yuting TAN Qianxi ZHU Ziming WU Xinyu JIANG Hongbo LI Hang SHI Qianqian School of Civil Engineering and Architecture Guangxi UniversityNanning 530004China School of Forestry Guangxi UniversityNanning 530004China Ecosystem Science and Management Program University of Northern British ColumbiaPrince George V2N 4Z9Canada Zhuhai Institute of planning and design Zhuhai 519000China

This study focuses on urgent research on restoring and enhancing carbon storage capacity in the Beibu Gulf urban Agglomer-ation of china,a key area in the‘Belt and Road’Initiative,which aligns with carbon peaking and neutrality *** research ana-lyzes the spatial characteristics of carbon metabolism from 2000 to 2020 and uses models to identify stable carbon sink areas,positive carbon flow corridors,and carbon sequestration *** goal is to construct a carbon metabolism spatial security pattern(CMSSP)and propose territorial ecological restoration strategies under different development demand *** results show the following:1)in 2020,the study area’s carbon sink decreased by 8.29×10^(4) t C/yr compared with that in 2010 and by 10.83×10^(4) t C/yr compared with that in ***-carbon sinks were found mainly in mountainous areas,whereas low-carbon sinks are concentrated in urban con-struction land,rural residential areas,and land margins.2)From 2000 to 2020,the spatial security pattern of carbon metabolism tended to be‘high in the middle of the east and west and low in the gulf.’In 2000,2010,and 2020,16 stable carbon sinks were *** carbon energy flow density in Guangxi was greater than that in Guangdong and Hainan,with positive carbon flow corridors located primarily in Guangxi and *** number of carbon sequestration nodes remained stable at approximately 15,mainly in Guangxi and Hainan.3)Scenario simulations revealed that under the Nature-based mild restoration scenario,the carbon sink rate will reach 611.85×10^(4) t C/yr by 2030 and increase to 612.45×10^(4) t C/yr by 2060,with stable carbon sinks increasing to *** the restora-tion scenario based on Anti-globalization,the carbon sink will decrease from 610.24×10^(4) t C/yr in 2030 to 605.19×10^(4) t C/yr in 2060,with the disappearance of some positive carbon flow corridors and stable carbon *** the Human-based sustainable restoration scenario,the carbon sink area wil

关键词： carbon metabolism spatial security pattern(CMSSP) territorial ecological restoration carbon sink carbon storage capacity Beibu Gulf urban Agglomeration,china

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Failure rate analysis and maintenance plan optimization method for civil aircraft parts based on data fusion

引用

Chinese Journal of Aeronautics 2025年第1期38卷 306-324页

作者： Kang CAO Yongjie ZHANG Jianfei FENG School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072China Shanghai Aircraft design and Research Institute Shanghai 201210China

In the face of data scarcity in the optimization of maintenance strategies for civil aircraft,traditional failure data-driven methods are encountering challenges owing to the increasing reliability of aircraft *** study addresses this issue by presenting a novel combined data fusion algorithm,which serves to enhance the accuracy and reliability of failure rate analysis for a specific aircraft model by integrating historical failure data from similar models as supplementary *** a comprehensive analysis of two different maintenance projects,this study illustrates the application process of the *** upon the analysis results,this paper introduces the innovative equal integral value method as a replacement for the conventional equal interval method in the context of maintenance schedule *** Monte Carlo simulation example validates that the equivalent essential value method surpasses the traditional method by over 20%in terms of inspection efficiency *** discovery indicates that the equal critical value method not only upholds maintenance efficiency but also substantially decreases workload and maintenance *** findings of this study open up novel perspectives for airlines grappling with data scarcity,offer fresh strategies for the optimization of aviation maintenance practices,and chart a new course toward achieving more efficient and cost-effective maintenance schedule optimization through refined data analysis.

关键词： Small sample data Data fusion Failure rate Maintenance planning Aircraft parts

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical Study of the Shallow-Water Effect on the Hydrodynamic Loads and Wake of a Ship in Oblique Flow

引用

Journal of Ocean University of china 2025年第1期24卷 63-74页

作者： FENG Liang WANG Longsheng ZHANG Yuxin College of Engineering Ocean University of ChinaQingdao 266404China Shanghai Merchant Ship design and Research Institute Shanghai 201203China

When a ship moves in an oblique flow,its hydrodynamic loads and wake characteristics vary substantially from those in straight-ahead *** dissimilarity can be even more complex when the ship operates in a seaway of shallow *** this paper,a numerical analysis of the shallow-water effect on the hydrodynamic forces and wake characteristics of an international ship model,KVLCC2,in oblique flows is *** simulations are performed based on the Reynolds Averaged NavierStokes equation in conjunction with the shear stress transport(SST)k-ωturbulence *** relative water depths(h=1.2T,1.5T,3.0T,and 24T;T is the ship draft)and five different drift angles(β=0°,5°,10°,15°,and 20°)are *** reveal the following:i)The shallow-water effect is strong and leads to nonlinear increases in the longitudinal force regardless of drift angles and on the transverse force and yaw moment whenever the drift angle ***)In shallow water,the mean wake fraction is sensitive to the drift angle,and the strength of the aft-body vortex on the leeward side increases.

关键词： oblique flow shallow-water effect hull wake computational fluid dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cluster and characteristic analysis of Shanghai metro stations based on metro card and land-use data

引用

Geo-Spatial Information Science 2020年第4期23卷 352-361页

作者： Ping Shen Linxin Ouyang Chong Wang Yin Shi Yiheng Su Guangzhou urban planning&design Survey Research Institute GuangzhouChina Shanghai Tongji urban planning&design Institute Co. Ltd.ShanghaiChina Tongji Architectural design(Group)Co. Ltd.ShanghaiChina Shanghai urban planning and design Research Institute ShanghaiChina

Metro is an important form of public transport in *** on the metro card data,we conduct the cluster analysis of Shanghai metro stations according to the pattern of passenger flow changing with *** the characteristics of travel time and surrounding land use are investigated for different types of stations to explore the relationship between urban land-use characteristics and travel activities reflected by passenger flow at metro *** is found that the passenger flow pattern of metro stations is closely related to the location conditions of stations and its surrounding land-use *** on various characteristics,285 metro stations are classified into four types,including residential-oriented stations,employmentoriented stations,employment-residence-oriented stations,and integrated functionaloriented stations,reflecting the interaction between spontaneous travel behavior and urban land-use characteristics and providing a reference for optimizing the urban functional structure and the spatial allocation of facilities.

关键词： Metro stations travel behavior pattern metro card data land use

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mechanistic insight on nanomaterial-induced reactive oxygen species formation

引用

Journal of Environmental Sciences 2025年第5期151卷 200-210页

作者： Jianzhong Cao Qingchun Wu Xuting Liu Xiangyu Zhu Chunfeng Huang Xinyu Wang Yang Song State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese academy of Sciences Beijing 100049China

Reactive oxygen species(ROS)are closely related to cell death,proliferation and ***,excessive ROS levels may exceed the cellular oxidative capacity and cause irreversible *** are often inadvertently exposed to nanomaterials(NMs).Therefore,elucidating the specific routes of ROS generation induced by NMs is crucial for comprehending the toxicity mechanisms of NMs and regulating their potential *** paper provides a comprehensive review of the toxicity mechanisms and applications of NMs from three perspectives:(1)Organelle *** the impact of NMmediated ROS onmitochondria,unravelingmechanisms at the organelle level.(2)NMs’*** the broad applications and biosafety considerations of Nanozymes,a unique class of NMs.(3)Cellular *** the toxic effects and mechanisms of NMs in cells at a holistic cellular *** on these perspectives,the paper scrutinizes the regulation of Fenton reactions by NMs in ***,it introduces diseases resulting fromNM-mediated ROS at the organism *** comprehensive review aims to provide valuable insights for studying NM-mediated mechanisms at both cellular and organism levels,offering considerations for the safe design of nanomaterials.

关键词： Nanomaterials Reactive oxygen species(ROS) Toxicity Mitochondria Oxidative stress

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Economy's Impact on Carbon Emission Performance:Evidence from the Yangtze River Delta, china

引用

Chinese Geographical Science 2025年第2期 217-233页

作者： ZHANG Xinlin QIU Fangdao LIU Jibin School of Geography Geomatics and Planning Jiangsu Normal University School of Geographical Science Jiangsu Second Normal University School of Architecture and urban planning Jilin Jianzhu University

Climate change caused by carbon emissions is a hot topic of concern. Enhancing carbon emission performance(CEP)emerges as a pivotal strategy to curtail carbon emissions, with the digital economy recognized as a crucial instrument for bolstering CEP. Grounded in theoretical analysis, this article takes the Yangtze River Delta region(YRD) as the research object and conducts empirical analysis for the period from 2010 to 2021. The Super Epsilon-Based Measure(EBM) model was employed to assess CEP, while the entropy method was used to quantify the level of the digital economy. Baseline regression models and mediation effect models were constructed to test the research hypotheses. Additionally, the Spatial Durbin Model(SDM) was utilized to analyze the spatial spillover effects of the digital economy. Some conclusions were drawn as follows. Firstly, both the digital economy and CEP exhibit growing trends and demonstrate significant spatial distribution characteristics. Cities with high CEP are increasingly concentrated along the Yangtze River and coastal areas. Meanwhile, the digital economy generally demonstrates a spatial distribution pattern of being higher in the southeast and lower in the northwest. Secondly, the digital economy exerts a notable and consistent positive influence on CEP, but this impact is not primarily achieved through promoting green technology innovation. Instead, the digital economy exhibits a stronger intermediary effect on CEP by facilitating industrial structure upgrading and rationalization. Thirdly, the digital economy significantly enhancing local CEP but having an insignificant impact on neighboring cities' CEP. To address these findings, cities ought to invest in digital infrastructure, incentivize digital innovation through policy and financial backing, and harness advanced technologies like 5G and blockchain to promote low-carbon, intelligent production and lifestyles, while enhancing industrial structure and regional cooperation to foste

关键词：

来源：

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Lessons from Nature:Advances and Perspectives in Bionic Microwave Absorption Materials

引用

Nano-Micro Letters 2025年第4期17卷 454-486页

作者： Dashuang Wang Tuo Ping Zhilan Du Xiaoying Liu Yuxin Zhang College of Materials Science and Engineering Chongqing UniversityChongqing 400044People’s Republic of China Army Logistics academy of PLA Chongqing 401331People’s Republic of China Beijing Spacecrafts China Academy of Space TechnologyBeijing 100194People’s Republic of China

Inspired by the remarkable electromagnetic response capabilities of the complex morphologies and subtle microstructures evolved by natural organisms,this paper delves into the research advancements and future application potential of bionic microwave-absorbing materials(BMAMs).It outlines the significance of achieving high-performance microwave-absorbing materials through ingenious microstructural design and judicious composition selection,while emphasizing the innovative strategies offered by bionic ***,this work meticulously analyzes how inspiration can be drawn from the intricate structures of marine organisms,plants,animals,and nonmetallic minerals in nature to devise and develop BMAMs with superior electromagnetic wave absorption ***,the paper provides an in-depth exploration of the theoretical underpinnings of BMAMs,particularly the latest breakthroughs in broadband *** incorporating advanced methodologies such as simulation modeling and bionic gradient design,we unravel the scientific principles governing the microwave absorption mechanisms of BMAMs,thereby furnishing a solid theoretical foundation for understanding and optimizing their ***,this review aims to offer valuable insights and inspiration to researchers in related fields,fostering the collective advancement of research on BMAMs.

关键词： Bionic Structural design Microwave absorption Electromagnetic theory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：