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Research on the Potential of Urban Green-Blue Infrastructure in Carbon Reduction Benefits

景观设计学(中英文) 2025年第2期13卷 12-25页

作者： Yunsheng BAI Gengyuan LIU Mingwan WU Zhaoman HUO Ningyu YAN Fanxin MENG Qing YANG Zhongming LU Silvio CRISTIANO State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China Beijing Engineering Research Center for Watershed Environmental Restoration and Integrated Ecological Regulation Beijing 100875China Guangdong Basic Research Center of Excellence for Ecological Security and Green Development Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of EducationSchool of EcologyEnvironment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China Division of Environment and Sustainability Hong Kong University of Science and TechnologyHong Kong 999077China Department of Architecture University of FlorenceFlorence 50121Italy

Urban green-blue infrastructures(GBls)are increasingly gaining attention in the pursuit of carbon neutrality,particularly within residential *** this background,this study established an integrated quantitative framework to assess both direct and indirect carbon reduction benefits of urban GBls,by leveraging Life Cycle Assessment approach to precisely calibrate the carbon sequestration benefits of three typical urban GBls(green roofs,sunken green spaces,and rain gardens)under three different scenarios and building a carbon sequestration database that includes 36 local plant species in *** research results indicate that GBls have a reducing effect on carbon emissions in urban residential *** extrapolating the simulation results to the city scale,the preliminary estimation suggests that the construction of GBls within residential areas in Shanghai can achieve a carbon sink of approximately 540.54 million tCOzeq per *** level of carbon sequestration is equivalent to 32%of Shanghai's annual carbon *** is evident that the construction of GBls possesses significant potential in carbon reduction benefits and for achieving urban carbon neutrality strategies.

关键词： Green-Blue Infrastructure Life Cycle Assessment Planting Design Green-Blue Infrastructure Design Carbon Reduction Benefit Carbon Sequestration Residential Area

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Thermomechanical degradation mechanisms of high-entropy (Yb 0.25 Er 0.25 Ho 0.25 Y 0.25 ) 2 SiO 5 environmental barrier coatings under CMAS melt infiltration

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Journal of the European Ceramic Society 2025年第15期45卷

作者： Zhijia Zhang Guo Jin Xiufang Cui Zhuo Chen Qicheng Li Shinan Hu Dechang Ma Hanchun Wang Xin Wen Haoliang Tian Haidou Wang Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin 150001 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical Materials Beijing 100095 China

This study examines the thermomechanical degradation mechanisms of a high-entropy (Yb 0.25 Er 0.25 Ho 0.25 Y 0.25 ) 2 SiO 5 (4REMS) environmental barrier coating under CMAS melt infiltration. The investigation considers both isothermal and thermal cycling conditions. Under isothermal exposure, the 4REMS coating exhibited excellent corrosion resistance due to the formation of a continuous apatite reaction layer that effectively inhibited melt infiltration. The synergistic dissolution of Yb 3 + , Er 3+ , Ho 3+ and Y 3+ cations in the CMAS melt promoted the formation of this dense layer. However, during cyclic corrosion testing, the emergence of microcracks compromised the structural integrity of the reaction layer, leading to an accelerated penetration rate of corrosive species. Furthermore, periodic temperature fluctuations induced dynamic instabilities in the dissolution-precipitation equilibrium, resulting in pronounced morphological alterations of apatite grains, including enhanced nucleation and coarsening.

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Manipulation of Phase Structure and Se Vacancy to Enhance the Average Thermoelectric Performance of AgBiSe2

SSRN

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SSRN 2022年

作者： Li, Shan Hou, Shuaihang Xue, Wenhua Yin, Li Liu, Yijie Wang, Xiaodong Chen, Chen Mao, Jun Zhang, Qian School of Civil Aviation Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China School of Materials Science and Engineering Institute of Materials Genome & Big Data Harbin Institute of Technology Shenzhen518055 China

The high-temperature cubic phase of AgBiSe2 has been revealed to enable promising thermoelectric performance because of the high symmetry. In this work, it is shown that the cubic phase could be stabilized at room temperature by alloying SnSe. Although the effective mass increased, the decreased carrier concentration and mobility as well as the aggravated bipolar effect deteriorated the thermoelectric properties of the pure cubic phase. In contrast, the room-temperature rhombohedral AgBiSe2 obtained a peak zT value of ~0.66 at 723 K, which is attributed to the decreased thermal conductivity and increased power factor. Furthermore, reducing Se content not only increased the carrier concentration, but also increased the mobility due to the reduced energy barrier, and hence substantially improved the power factor over the whole temperature range. As a result, the peake zT and average zT were further enhanced in Ag0.94Bi0.94Sn0.06Se1.92. This work provides a novel strategy to optimize the thermoelectric performance of AgBiSe2 material. © 2022, The Authors. All rights reserved.

关键词： Selenium

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Multiple α sub-variants and anisotropic mechanical properties of an additively-manufactured Ti-6Al-4V alloy

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Journal of Materials science & technology 2021年第11期70卷 113-124页

作者： Yinling Zhang Zhuo Chen Shoujiang Qu Aihan Feng Guangbao Mi Jun Shen Xu Huang Daolun Chen School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoOntario M5B 2K3Canada Aerospace Hiwing(Harbin)Titanium Industrial Co. Ltd.Harbin High Tech ZoneHarbin 150028China Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Additive manu facturing(AM)is a promising material processing method which gains significant momentum in the aerospace and biomedical ***,the anisotropy in the mechanical properties of additively-manufactured materials is still poorly *** study was aimed at elucidating crystallographic feature-anisotropy-mechanical property relationship for a Ti-6Al-4V alloy manufactured via selective electron beam melting(SEBM).Abundantαlamellae with six variants were present inside the columnar prior-βgrains with a<100>fiber texture duringβ→αphase *** sixαvariants followed the Burgers orientation relationship of{110}_(β)//{0001}_(α)and<1-11>_(β)//<11-20>_(α).Multiple sub-variants in eachαvariant were observed for the first *** anisotropy in the mechanical properties was mainly related to the relative amount of sixα*** the horizontally-oriented samples had a lower yield strength,they exhibited a higher ductility and longer fatigue life than the vertically-oriented *** softening occurred at higher strain amplitudes,and cyclic stabilization sustained at lower strain *** crack mainly initiated from the specimen surface at lower strain amplitudes,while multiple crack initiation tended to occur at higher strain *** propagation was characterized by fatigue striations along with some secondary cracks.

关键词： Titanium alloy 3D printing Deformation behavior Anisotropy Burgers orientation relationship

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Crystal structures and superconductivity of carbonaceous sulfur hydrides at pressures up to 300 GPa

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Physical Review B 2022年第13期105卷 134501-134501页

作者： Ying Sun Xue Li Toshiaki Iitaka Hanyu Liu Yu Xie International Center for Computational Method & Software and State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China Discrete Event Simulation Research Team RIKEN Center for Computational Science 2-1 Hirosawa Wako Saitama 351-0198 Japan Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of Physics Jilin University Changchun 130012 China International Center of Future Science Jilin University Changchun 130012 China

To explore the crystal structure of the recently claimed room-temperature superconducting carbonaceous sulfur hydrides, we searched for ≈250000 structures over ≈800 stoichiometries at 300 GPa via advanced crystal structure searching and cluster expansion method. Only several metastable high-temperature superconductors were identified, whose structures can be classified into hydrogen-rich molecular crystals and low-level carbon-doped H3S-like structures by constructing the ternary phase diagram and simulating the electron-phonon interactions. The C–S–H molecular crystals are composed of CH4, SH6, and H2 molecules, where the superconductivity (with the highest superconducting critical temperature Tc is 156 K found in CSH48 at 300 GPa) is mainly contributed to by H2 units, implying their Tc values are unlikely to be higher than that of metallic molecular hydrogen (Tc of 242 K at 450 GPa). The highest Tc of low-level carbon-doped C–S–H compounds (up to 64 atoms in the primitive cell) at 300 GPa was estimated as 189 K for H3S0.917C0.083. Our results provide a comprehensive map between the crystal structure and superconductivity of carbonaceous sulfur hydride materials at high pressures.

关键词： Pressure effects Superconductivity Hydrides

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Microstructures and phase transformation in directionally solidified TiAl-Nb alloys

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China Foundry 2020年第6期17卷 402-408页

作者： Fu-qiang Zhang Xian-fei Ding Hai Nan Ru-yue You Qiang Wang Jian-ping He Yan-qing Su Yong-feng Liang Jun-pin Lin State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China AECC Hunan Aviation Powerplant Research Institute Harbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyZhuzhou 412002China

Intermetallic Ti-45Al-8Nb-(W,B,Y)(at.%)and Ti-46Al-5Nb alloys are directionally solidified at a constant growth rate of 30μm·s-1 using a Bridgman type *** quenched microstructures and lengths of different phase regions were observed and measured after various growing times of 0-30 *** show that the phase transformations in different phase regions are mainly depending on the high temperature microstructure and the supercooling degree during quenching *** isothermal holding,the primary phase grows into the liquid phase,the dendrites change from equiaxed to columnar grains,and the length of the L+βphase region,L+β+αphase region and mushy zone varies,indicating that the entire directional solidification process can be described by a static equilibrium-nonequilibrium-dynamic equilibrium evolution *** addition,the gap between the original growth interface and front interface shows that the actual crystal growth rate is not equal to the drawing velocity during directional solidification.

关键词： TiAl alloys directional solidification quenched microstructure phase transformation

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Unraveling the Influence of Precipitation and Temperature Variability on Anthropogenic Nutrient Inputs in a River Basin: Implications for Environmental Management

SSRN

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SSRN 2024年

作者： Zhang, Shuhui Li, Xia Ren, Ze Zhang, Cheng Fang, Le Mo, Xiaobiao Yang, Wei Liu, Xinhui Advanced Institute of Natural Sciences Beijing Normal University Zhuhai519087 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China Key Laboratory of Coastal Water Environmental Management and Water Ecological Restoration of Guang-dong Higher Education Institutes Beijing Normal University Zhuhai519087 China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing210008 China Instrumentation and Service Center for Science and Technology Beijing Normal University Zhuhai519087 China Faculty of Arts and Sciences Beijing Normal University Zhuhai China

Since the Industrial Revolution, anthropogenic activities have substantially increased the input of nitrogen (N) and phosphorus (P) into river basins, complexity by interplay with climate. This study analyzed the characteristics of N and P inputs within the Dawen River Basin from 2000 to 2021 using the Net Anthropogenic Nitrogen Input (NANI) and Net Anthropogenic Phosphorus Input (NAPI) methods, and explored how those variables respond to precipitation and temperature variability. We found a generally decreasing trend in NANI over time, with an average of 17,882.34 kg N km-2 yr-1. In contrast, NAPI showed an initially increasing and then decreasing trend from 2000 to 2021, with an average value of 5,151.79 kg P km-2 yr-1. Fertilizer usage emerged as the primary source of nutrient inputs, accounting for approximately 63.42% of N and 61.88% of P inputs. Precipitation positively impacted the NANI and NAPI while temperature exerted a more influential but opposing effect. Time-lag effects were evident, as demonstrated by the stronger influences of temperature in preceding year on NANI and NAPI. Moreover, climate not only impacted the quantity of NANI and NAPI but also highly correlated to their changes, as well as the dynamics of their components. Through quantitative analyses, we unveiled key thresholds in the correlation between nutrient inputs and climate variables, with cutoffs of 14.1℃ in temperature and 820 mm in precipitation. These insights highlight the complex relationship between anthropogenic nutrient inputs and climate variability, underscoring the importance of sustainable management practices in the Dawen River Basin to mitigate negative environmental impacts. © 2024, The Authors. All rights reserved.

关键词： Nitrogen

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3 Nm-Sized Porous Graphene-Based Anion Exchange Membranes for Efficient and Stable Water Electrolysis

SSRN

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SSRN 2024年

作者： Liu, Xiang Zhang, Ai ling Yu, Hao Chen, Liang Zhang, Lei Zhao, Yong Li, Jialu Zhang, Weiqi Zhou, Zhiting Zhou, Yongyan Wang, Yuanyuan Ou, Jian Zhen Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province Guanghan618307 China College of Civil Aviation Safety Engineering Civil Aviation Flight University of China School of Science Sichuan Guanghan618307 China Xihua University Jinzhou Road Sichuan Chengdu610039 China Sichuan Key Technology Engineering Research Center for All-electric Navigable Aircraft Sichuan Guanghan618307 China Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu610031 China School of Engineering RMIT University MelbourneVIC3000 Australia The 7th Oil Production Plant of Changqing Oilfield Gansu Qingyang745708 China

Alkaline water electrolysis is one of the primary drivers of hydrogen energy development, and anion exchange membranes (AEMs) play a dual role in ensuring both conductivity and safety. However, traditional polymer AEMs have a wide pore size distribution and poor chemical stability, making it difficult to achieve a long-term balance between conductivity and safety of the water electrolysis system. Here, we select inorganic two-dimensional multilayer graphene oxide (GO) membranes as AEMs, using carboxylated wrinkled graphene (WG) and ethylenediamine (EDA) to create a cation-modified porous EDA-GO/WG (E-W/G) composite membrane with a 3 nm pore size. The enlarged channel size and enhanced hydrophilicity improve OH- permeability compared to the pristine GO membrane, while the strengthened hydration layer acts as a barrier to hydrophobic gases for O2/H2 separation. The results show that the prepared E-W/G membrane exhibits superior current density (600 mA cm-2) and gas impermeability (gas purity 99.99%) compared to the commercial Fumasep FAA-3-50 membrane (590 mA cm-2 and 99.81%, respectively). Furthermore, after continuous testing for 168 hours in high-temperature and alkaline environments, the E-W/G membrane maintained conductivity comparable to its initial state and showed enhanced gas impermeability. Our strategy provides new insights into the design of high-performance AEMs and is expected to contribute to the advancement of the hydrogen energy industry. © 2024, The Authors. All rights reserved.

关键词： Graphene

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Sub-Nano Porous Graphene-Based Membranes Enabled by In-Situ-Grown Zif-8 for Enhanced CO2 Capture

SSRN

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SSRN 2024年

作者： Zhang, Lei Zhao, Yong Yu, Hao Chen, Liang Liu, Xiang Zhang, Ailing Ou, Jian Zhen Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province Guanghan618307 China College of Civil Aviation Safety Engineering Civil Aviation Flight University of China School of Science Sichuan Guanghan618307 China Xihua University Jinzhou Road Sichuan Chengdu610039 China Sichuan Key Technology Engineering Research Center for All-electric Navigable Aircraft Sichuan Guanghan618307 China Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu610031 China School of Engineering RMIT University MelbourneVIC3000 Australia The 7th Oil Production Plant of Changqing Oilfield Gansu Qingyang745708 China

Graphene oxide (GO) membranes hold promise for selective CO2 adsorption over N2 due to their carboxyl groups, making them attractive for flue gas CO2 capture. However, challenges such as limited carboxyl content, flexible nanosheets, and dense layer stacking hinder their N2/CO2 gas selectivity, pressure resistance, and permeability. In this study, we introduce a specific sub-nanometer framework structure within GO membranes by in-situ growing ZIF-8 nanocrystals. This novel approach, achieved through simultaneous infiltration of zinc nitrate and 2-methylimidazole precursors on both sides of the membrane, enhances CO2 capture and pressure resistance capabilities of resulting ZIF-8@GO composite membranes. Additionally, the incorporation of carboxylated wrinkled graphene (WG) and ethylenediamine (EDA) cross-linking agent molecules improves CO2 capture capability and introduces reinforced porous structures to enhance permeability. Experimental results demonstrate remarkable permeability, selectivity, and pressure resistance of the prepared ZIF-8@EDA-WG/GO composite membranes. Under a gas pressure of 0.2 MPa, permeability reaches 1850 GPU, with theoretical selectivity for N2/CO2 single gas and separation factors for mixed gases of 19 and 32.3, respectively, surpassing conventional GO membranes (200 GPU, 1.4, and 2.1). Even under elevated air pressure conditions (1.2 MPa), the composite membranes maintain a theoretical selectivity of 13.4. Our CO2 capture membrane design strategy not only advances the development of functional membranes but also contributes to mitigating CO2 emissions from flue gas, thereby combating global warming. © 2024, The Authors. All rights reserved.

关键词： Graphene

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Preparation of Sa508 Gr.3 Steel by Selective Laser Melting: Role of Volumetric Energy Density on Densification, Microstructure and Mechanical Properties

SSRN

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SSRN 2022年

作者： Liu, Yiru Ding, Ran Han, Ying Wang, Hui Guo, Qianying Ma, Zongqing Liu, Yongchang State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and Engineering Tianjin University Tianjin China Key Laboratory of Advanced Structural Materials Ministry of Education School of Materials Science and Engineering Changchun University of Technology Changchun130012 China School of Mechanical Engineering Chengdu University Chengdu China

In this work, the effect of volumetric energy density (VED) on densification, microstructure and mechanical properties of SA508 Gr.3 steel produced by selective laser melting (SLM) was studied. As the VED gradually increases, the relative density of the specimens first increases and then decreases. It is determined that the VED range which can obtain the specimens with the highest relative density (99.4 ± 0.3%) is 111-133 J/mm3. The formation mechanism of the defects in the SLM manufactured specimens with excessively high or low VEDs was explored. In addition, the microstructure of the specimens in the horizontal and vertical planes both exhibit the tempered martensite with a small amount of retained austenite. On the basis, the specimens with the highest relative density (99.4 ± 0.3%) possess the highest hardness (320.04 ± 7 HV), strength (1041 ± 6 MPa) and elongation (19 ± 3%) compared to the other specimens with the excessively high and low VEDs. © 2022, The Authors. All rights reserved.

关键词： Microstructure

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