Global Challenges最新文献_第8页

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-24

引用次数: 0

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-24

引用次数: 0

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-24

引用次数: 0

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-24

引用次数: 0

Spatio-Temporal Modeling of Land-Use/Land-Cover Change and Land Surface Temperature Using SVM and CA–Markov in Dilla Town, Ethiopia 基于SVM和CA-Markov的埃塞俄比亚Dilla镇土地利用/土地覆被变化与地表温度时空模型

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-10 DOI: 10.1002/gch2.70103

Tsion Ayalew Kebede, Wondimu Haimanote Gebremariam, Hiwot Yitayew Bogale, Talema Moged Reda, Muralitharan Jothimani

{"title":"Spatio-Temporal Modeling of Land-Use/Land-Cover Change and Land Surface Temperature Using SVM and CA–Markov in Dilla Town, Ethiopia","authors":"Tsion Ayalew Kebede, Wondimu Haimanote Gebremariam, Hiwot Yitayew Bogale, Talema Moged Reda, Muralitharan Jothimani","doi":"10.1002/gch2.70103","DOIUrl":"10.1002/gch2.70103","url":null,"abstract":"Urban expansion in Dilla Town, Ethiopia, has progressively reshaped local thermal conditions by replacing vegetation and cropland with impervious built-up surfaces. This study analyses how three decades of land-use/land-cover (LULC) change have modified land surface temperature (LST) and projects future thermal patterns. Landsat TM/ETM+/OLI imagery from 2001, 2011, and 2021 was classified into five LULC classes using a Support Vector Machine (overall accuracy 90.4–92.4%; κ = 0.88–0.90). LST was retrieved from thermal bands via a single-channel algorithm and related to NDVI and the Normalized Difference Built-up Index (NDBI). Between 2001 and 2021, the built-up area increased by ∼5.34 × 106 m2, while mixed forest and cropland decreased by 3.14 × 106 m2 and 2.92 × 106 m2, respectively. Over the same period, LST rose from 23.17°C to 33.80°C to 24.42°C to 40.18°C, and mean LST increased from 27.47°C to 30.61°C. In 2021, LST showed a strong positive correlation with NDBI (R2 ≈ 0.64) and a negative correlation with NDVI (R2 ≈ 0.36). A CA–Markov model, validated with a Kappa Index of Agreement of up to 0.95, predicts continued urban expansion and a marked shift toward hotter LST classes by 2031, emphasizing the need for greening, wetland conservation, and heat-aware urban planning.","PeriodicalId":12646,"journal":{"name":"Global Challenges","volume":"10 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13067069/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147672381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Amine-Functionalized Activated Carbon Monoliths by 3D Printing for Direct Air Capture 3D打印用于直接空气捕获的胺功能化活性炭单体。

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-10 DOI: 10.1002/gch2.70105

Johanna Fricke, Zoltán Bacsik, Christine Schütz, Marc Rüggeberg, Anju Pal, Niklas Hedin, Jiayin Yuan

{"title":"Amine-Functionalized Activated Carbon Monoliths by 3D Printing for Direct Air Capture","authors":"Johanna Fricke, Zoltán Bacsik, Christine Schütz, Marc Rüggeberg, Anju Pal, Niklas Hedin, Jiayin Yuan","doi":"10.1002/gch2.70105","DOIUrl":"10.1002/gch2.70105","url":null,"abstract":"Direct air capture (DAC) is an emerging technology that supports mitigating climate change. However, its large-scale deployment is hindered by high energy demands and material costs. In this study, we present a novel porous sorbent material for DAC using 3D-printed activated carbon monoliths functionalized with an aminosilane compound. The monoliths were fabricated via direct ink writing and subsequently modified with 3-aminopropyltriethoxysilane (APTES) to introduce chemisorption sites for CO2. Structural and chemical analyses confirmed successful grafting of amines without compromising the monolithic architecture. The resulting monoliths demonstrated enhanced CO2 uptake at atmospheric concentrations (0.25 mmol g−1 at 0.04 kPa). IR spectroscopy revealed that the functionalized monoliths chemisorb CO2 from ambient air as ammonium carbamate. Chemisorbed CO2 can be desorbed at a temperature of 75°C, indicating a low energy requirement for a DAC process. To the best of our knowledge, this paper is the first published application of aminosilane-functionalized activated carbon for DAC, highlighting its potential as a cost-effective and scalable sorbent material.","PeriodicalId":12646,"journal":{"name":"Global Challenges","volume":"10 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13066914/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147672427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photo-Assisted Charge–Discharge Behavior of NMC622 Cathode NMC622阴极的光辅助充放电行为。

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-10 DOI: 10.1002/gch2.70100

Meltem Çayirli, Ersu Lökçü, Reşat Can Özden, Mustafa Anik

{"title":"Photo-Assisted Charge–Discharge Behavior of NMC622 Cathode","authors":"Meltem Çayirli, Ersu Lökçü, Reşat Can Özden, Mustafa Anik","doi":"10.1002/gch2.70100","DOIUrl":"10.1002/gch2.70100","url":null,"abstract":"In this study, a nitrogen (N)-doped graphene film was synthesized on copper foil via chemical vapor deposition (CVD) and employed as a photocatalytic electrode for the photo-assisted charging and discharging of lithium-ion batteries (LIBs). By integrating the photocatalyst as a separate electrode and allowing the cathode to function solely in its conventional role, this configuration mitigated the long-term degradation of light-harvesting efficiency commonly observed in semiconductor-based cathodes and eliminated the constraint of using only semiconductor materials in LIBs. The photo-charging response of the LIB under 1 Sun illumination yielded a photo-conversion efficiency (η%) of 0.152% for the N-doped graphene. Photo-assisted operation enhanced the discharge capacity by at least 15%, improved capacity retention to 90%, and maintained a Coulombic efficiency of 100% over 100 cycles in NMC622 half-cells. The photo-generated electrons effectively accelerated interfacial charge transfer kinetics, thereby facilitating redox reactions at the electrode–electrolyte interface during cycling. Overall, this photo-assisted strategy not only improves LIB performance but also offers a promising route for integrating solar energy conversion directly into energy storage technologies.","PeriodicalId":12646,"journal":{"name":"Global Challenges","volume":"10 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13066908/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147672430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observed Hydroclimatic Trends and Their Implications Over Water-Cycle Dynamics in Montérégie, Southern Quebec, Canada 观测到的水文气候趋势及其对加拿大魁北克省南部蒙塔姆萨伊水循环动力学的影响。

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-04-06 DOI: 10.1002/gch2.202500564

Jorge Mona, Christin Müller, Janie Masse-Dufresne, Alexandra Mattei, Florent Barbecot

{"title":"Observed Hydroclimatic Trends and Their Implications Over Water-Cycle Dynamics in Montérégie, Southern Quebec, Canada","authors":"Jorge Mona, Christin Müller, Janie Masse-Dufresne, Alexandra Mattei, Florent Barbecot","doi":"10.1002/gch2.202500564","DOIUrl":"10.1002/gch2.202500564","url":null,"abstract":"A comprehensive understanding of groundwater recharge processes is essential for sustainable water resource management under climate change and increasing anthropogenic pressures. This study evaluates hydroclimatic trends (1980–2023) and their impacts on water-cycle dynamics in Montérégie, a predominantly agricultural and forested region in southern Quebec, Canada, characterized by spring snowmelt and biannual baseflow discharge. Historical records of temperature, precipitation, streamflow, groundwater levels, and land cover are analyzed for 20 subwatersheds and 50 piezometers, with missing data addressed using Multiple Imputation by Chained Equations. Trends are assessed using Mann-Kendall and Sen's Slope tests, while potential groundwater recharge is simulated with the GR4J hydrological model coupled with the CemaNeige snow module. Results indicate significant regional warming, particularly in summer and autumn, leading to longer growing seasons and more frequent winter melt events. Precipitation intensity has increased, contributing to slightly higher winter streamflow. Approximately 75% of annual GR4J percolation occurs during winter-spring. Recharge increases in the Baie Missisquoi due to earlier snowmelt but declines elsewhere because of higher evapotranspiration and drier soils. Groundwater levels rise in central Richelieu but decline in central-western Montérégie due to pumping and limited recharge capacity. These findings support adaptive groundwater management.","PeriodicalId":12646,"journal":{"name":"Global Challenges","volume":"10 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13053673/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147638648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Toward Sustainability in Cardiac Tissue Engineering: Electrospun Polyurethane Scaffolds Functionalized With Lemon-Derived Bioactives 心脏组织工程的可持续性：柠檬衍生生物活性功能化的电纺聚氨酯支架

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-03-27 DOI: 10.1002/gch2.70104

Mohan Prasath Mani, Saravana Kumar Jaganathan

{"title":"Toward Sustainability in Cardiac Tissue Engineering: Electrospun Polyurethane Scaffolds Functionalized With Lemon-Derived Bioactives","authors":"Mohan Prasath Mani, Saravana Kumar Jaganathan","doi":"10.1002/gch2.70104","DOIUrl":"10.1002/gch2.70104","url":null,"abstract":"This study reports the fabrication of electrospun polyurethane (PU) scaffolds functionalized with lemon extract to address global cardiac health needs. The PU/lemon composite demonstrated a refined microstructure, with fibre diameters decreasing from 890 to 680 nm and pore sizes reducing from 1064 to 864 nm, which may facilitate improved cellular interactions. Fourier Transform Infrared Spectroscopy (FTIR) analysis confirmed successful biofunctionalization through hydrogen bonding. The incorporation of lemon shifted the surface from hydrophobic (100°) to more hydrophilic (86.67°) and increased the surface roughness (332 nm vs. 313 nm). Mechanical and thermal stability were also enhanced, with tensile strength increasing from 7.12 to 15.89 MPa. Crucially, the scaffold exhibited improved hemocompatibility, featuring a low haemolysis index (0.83% vs. 2.48%) and prolonged blood clotting times meeting international safety standards for blood-contacting devices. Furthermore, the scaffolds displayed antimicrobial activity against S. aureus and E. coli, while promoting higher human dermal fibroblast (HDF) cell proliferation (169% vs. 133%). By combining improved mechanical resilience, antithrombogenicity, and bioactivity, the PU/lemon scaffold presents a sustainable and multifunctional platform for cardiac tissue engineering, potentially contributing to global efforts, including the World Health Organization (WHO) goals for advancing cardiovascular regenerative therapies.","PeriodicalId":12646,"journal":{"name":"Global Challenges","volume":"10 4","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/gch2.70104","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147585012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biomimetic and Bioinspired Materials: Design Strategies, Mechanical Properties, and Engineering Applications—A Review 仿生和仿生材料：设计策略、机械性能和工程应用综述

IF 6.4 4区综合性期刊

Global Challenges Pub Date : 2026-03-27 DOI: 10.1002/gch2.70101

Manickaraj Karuppusamy, Sivasubramanian Palanisamy, Mahesh Gurusamy, Vijaya Prakash Balasubramanian, Manivannan Jayamani, Subramanian Lakshmi Sankar, Karthikayan Sundararajan, Gokulkumar Sivanantham, Syed Kashif Ali, Murugesan Palaniappan, Mezigebu Belay, Mohamed Abbas

{"title":"Biomimetic and Bioinspired Materials: Design Strategies, Mechanical Properties, and Engineering Applications—A Review","authors":"Manickaraj Karuppusamy, Sivasubramanian Palanisamy, Mahesh Gurusamy, Vijaya Prakash Balasubramanian, Manivannan Jayamani, Subramanian Lakshmi Sankar, Karthikayan Sundararajan, Gokulkumar Sivanantham, Syed Kashif Ali, Murugesan Palaniappan, Mezigebu Belay, Mohamed Abbas","doi":"10.1002/gch2.70101","DOIUrl":"https://doi.org/10.1002/gch2.70101","url":null,"abstract":"The field of biomimetic and bioinspired materials has progressed rapidly by drawing inspiration from nature's intricate structures and multifunctional systems in order to address pressing challenges in modern engineering. This review critically examines the mechanical performance of these materials, focusing on their hierarchical design principles, synthesis strategies, and versatility of application. Natural exemplars such as nacre, spider silk, and bone are emphasized, as their structural efficiency and functional adaptability have informed the development of synthetic analogues with superior strength, toughness, flexibility, and lightweight characteristics. The review also highlights advanced fabrication methods, such as additive manufacturing and precision chemical synthesis, which have enabled researchers to replicate the complexity of nature with ever-greater accuracy. Key case studies demonstrate how bioinspired strategies have been translated into high-performance materials for use in the aerospace, construction, and biomedical sectors. The review also discusses challenges related to scalability, reproducibility, and industrial integration. Finally, the review outlines emerging interdisciplinary approaches that are set to further enhance the mechanical properties and practical relevance of biomimetic materials, establishing them as transformative solutions for the next generation of engineering systems.","PeriodicalId":12646,"journal":{"name":"Global Challenges","volume":"10 3","pages":""},"PeriodicalIF":6.4,"publicationDate":"2026-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/gch2.70101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147615363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0