检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Yu, Peifeng Zhan, Jie Zhang, Xiaobing Wang, Kangwang Zeng, Lingyong Li, Kuan Zhang, Chao Li, Longfu Liang, Ying Yan, Kai Sun, Yan Luo, Huixia School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices Key Lab of Polymer Composite & Functional Materials Sun Yat-Sen University Guangzhou510275 China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Basic Course Department Guangzhou Maritime University Guangzhou510725 China School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou510275 China Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang110016 China

Exploring high-efficiency and low-cost electrocatalysts is valuable for water-splitting technologies. Recently, Si-group compounds have attracted increasing attention in electrocatalysis, considering the abundant Si-group elements on Earth. However, Si-group compounds for HER electrocatalysis have not been systematically studied. In this study, we unveil the activity trends of non-noble metal catalyst A15-type V3M (i.e., V3Si, V3Ge, and V3Sn) superconductors and show that V3Si is the most efficient HER catalyst because of the high electronic conductivity and suitable d-band center. Among them, the V3Si only requires 33.4 mV to reach 10 mA cm-2, and only 57.6 mV and 114.6 mV are required to attain a high current density of 100 mA cm−2 and 500 mA cm−2, respectively. These low overpotentials are close to the 34.3 mV at 10 mA cm−2 of state-of-art Pt/C (20 %) but superior to 168.5 mV of Pt/C (20 %) at 100 mA cm-2. Furthermore, the V3Si illustrates exceptional durability with no obvious decay in the 120 h at the different current densities (i.e., 10 - 250 mA cm−2). The excellent HER activity of V3Si alloy can be ascribed to the synergies of superior electronic conductivity and suitable d-band center. Moreover, DFT calculations reveal that |ΔGH*| is decreased after introducing the V to Si. Beyond offering a stable and high-performance electrocatalyst in an acidic medium, this work inspires the rational design of desirable silicide electrocatalysts. Copyright © 2024, The Authors. All rights reserved.

关键词： Hydrogen

来源：评论

学校读者我要写书评

暂无评论

An Effective Fenton Reaction by Using Waste Ferric Iron and Red Phosphorus

SSRN

引用

SSRN 2022年

作者： Zheng, Ningchao Lian, Yekai Zhou, Quan Wang, Ruilin He, Xi Hu, Ruiting Hu, Zhuofeng School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen University Guangzhou510006 China

Traditional Fenton reaction (Fe 2+ /H 2 O 2 ) is limited by the instability and the sluggish regeneration of ferrous iron (Fe 2+ ). Compared with Fe 2+ , ferric iron (Fe 3+ ) is cheaper, easier to obtain and more stable. It is well-known that iron products are easy to rust and abandon, and there is plenty of ferric ions in the environment. However, Fe 3+ -induced Fenton reaction activity is low. Here, a high-efficiency Fe 3+ /H 2 O 2 Fenton system is achieved by introduction of red phosphorus (P). In our study, rusted iron products are used as Fe 3+ sources to activate H 2 O 2 for pollutant degradation with the aid of red P. Red P can donate electrons to Fe 3+ for Fe 2+ regeneration. As a result, the red P/H 2 O 2 /Fe 3+ system has a fast degradation rate (K constant = 0.2328 min -1 ), a high H 2 O 2 decomposition rate (92.4%) and a wide range of pH applications (pH(2-8)). This study realizes the transformation of waste into treasure and resource reuse and reduces the cost of Fenton reaction. Besides, this study opens up a new strategy for utilization of widely-spread Fe 3+ for environmental remediation and also provides a new application of red P. © 2022, The Authors. All rights reserved.

关键词： Iron

来源：评论

学校读者我要写书评

暂无评论

Co-Production of Btx Aromatics and H2 from In-Situ Catalytic Pyrolysis of Polyethylene by Ni/Zsm-5 in the Rotary Reactor with Solid Heat Carriers

SSRN

引用

SSRN 2024年

作者： Zhang, Yutao Li, Aimin Zhang, Ye Shui Xie, Wensheng Liu, Chuanqun Peng, Yukun Zhang, Haibo Kang, Ying Qu, Boyu Ji, Guozhao Zhejiang Province Key Laboratory of Soil Contamination Bioremediation School of Environment and Resources Zhejiang Agriculture and Forestry University Hangzhou311300 China Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and Technology Dalian University of Technology 2 Linggong Road Dalian116024 China School of Engineering University of Aberdeen AberdeenAB24 3UE United Kingdom Ecological Environmental Monitoring Center of Zhejiang Province 117 Xueyuan Road Hangzhou310012 China

Plastic waste pollution has become a crucial concern in the field of environmental conservation. Catalytic pyrolysis offers an appealing and efficient technology that can convert plastic waste into pyrolysis oil or valuable chemical products. This provides a practical solution to address the challenges associated with waste management. In this research, an innovative approach of in-situ catalytic pyrolysis was employed in a rotary reactor with solid heat carriers, along with a Ni/ZSM-5 catalyst, to simultaneously produce BTX aromatics and hydrogen from polyethylene. Experimental investigations were conducted to evaluate the characteristics of the Ni/ZSM-5 catalyst. This was achieved by adjusting the metallic nickel loadings on the ZSM-5 support. Next, the effect of Ni/ZSM-5 catalysts and the catalyst-to-polyethylene mass ratio on the selectivity of BTX aromatics in the pyrolysis oil and hydrogen was examined. The results revealed that as the metallic nickel loading increased to 10 wt.%, the concentration of BTX aromatics in the pyrolysis oil also increased and reached a maximum of 59.2%. Furthermore, the hydrogen gas fraction in the pyrolysis gas was 58.0 vol.% when using the 10Ni/ZSM-5 catalyst in the in-situ catalytic pyrolysis process. The Ni/ZSM-5 catalyst demonstrated a significant positive effect in cleaving the H∙ group. By varying the catalyst-to-polyethylene mass ratio from 0.5 to 2, the concentration of monocyclic aromatics in the pyrolysis oil increased from 68.2% to 87.7%. However, the catalyst-to-feed ratio had an insignificant impact on the hydrogen fraction in the pyrolysis gas, with the hydrogen gas fraction ranging from 43.9 vol.% to 46.8 vol.%. Additionally, this study provided insights into the potential mechanism of in-situ catalytic pyrolysis of polyethylene within the rotary kiln. © 2024, The Authors. All rights reserved.

关键词： Polyethylenes

来源：评论

学校读者我要写书评

暂无评论

Stoichiometric Effect on the Structural Transformation and Spatial Variation of Polyamide Reverse Osmosis Membranes: A Molecular Dynamics Study

SSRN

引用

SSRN 2023年

作者： Li, Na Li, Meng Lin, Shihong Cui, Shufeng Zhang, Xuan Laboratory of New Membrane Materials Ministry of Industry and Information Technology School of Environmental and Biological Engineering Nanjing University of Science & Technology Nanjing210094 China Department of Civil and Environmental Engineering Vanderbilt University NashvilleTN37235 United States HID Membrane Co. Ltd Zhenjiang212000 China

Reverse osmosis based on polyamide membranes is currently the leading technology for desalination and water purification. However, the spatial variation of polyamide architecture, especially regarding stoichiometric criteria at the real reaction interface during membrane fabrication, is poorly understood. Here we conducted equilibrium molecular dynamic simulations, mimicking the practical construction of polyamide matrices using a variety of monomer component stoichiometries, to investigate resulting differences in both the morphological transformation and mass transport through the polymer network. Our simulations indicated that an equal stoichiometry of the reactive functional groups predominantly resulted in favorable polyamide matrix qualities such as a high crosslinking density, uniform pore size distribution, and adequate layer compactness. Despite the thickness-dependent water diffusion across the active layer, an analysis of polyamide membrane density revealed depth heterogeneity, particularly for membranes constructed under unequal concentrations. Consequently, uncontrollable defects are likely to be created, as evidenced by the partial penetration of Na+ across such membranes. In addition, the residual functional groups in the polyamide matrices (–COOH and –NH2) influenced the transport behavior of ions near the membrane surface. Overall, our simulations provide a visual platform for understanding the stoichiometry-induced relationship between membrane structure and performance, which may guide the future design of defect-free and scaling-resistant reverse osmosis membranes. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

Experimental Investigation on Seabed Response Characteristics Considering Vibration Effect of Offshore Monopile Foundation

SSRN

引用

SSRN 2023年

作者： Yu, Ziqin Cheng, Yongzhou Cheng, Haiyang School of Hydraulic and Environmental Engineering Changsha University of Science & Technology Changsha410114 China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha410114 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian116024 China

Monopile foundation is currently the most significant support form for offshore wind turbines. An experimental investigation of the vibration monopile was conducted inside the cohesionless saturated sand bed to examine the pore water pressure oscillation response law and amplitude variation features around the monopile under the vibration action. The experiment results indicate that the vibration loading force Fp, vibration frequency fv and vibration amplitude Av have remarkable impacts on the various characteristics of the pore pressure response around the monopile foundation. The delayed decay process in the oscillation cycle is more pronounced the lower the vibration frequency, and a succession of pore pressure sub-peaks develop near the phase end of the cycle period. Additionally, the pore pressure amplitude decay rate increases with increasing frequency as the depth of the seabed grows. With the increase of vibration frequency, the difference of pore pressure amplitude between the pile front and pile side gradually increases, and there is a tendency of increasing and then decreasing between pile side pore pressure and frequency. © 2023, The Authors. All rights reserved.

关键词： Foundations

来源：评论

学校读者我要写书评

暂无评论

Alkali-Activated Sintered Municipal Solid Waste Incinerator (Mswi) Fly Ash Concrete: Mechanical Properties and Constitutive Model

SSRN

引用

SSRN 2024年

作者： He, Sheng Xia, Xin Zhang, Honggang Li, Shuyang Zhou, Yitong College of Civil Engineering and Architecture Key Laboratory of Disaster Prevention and Structural Safety Ministry of Education Guangxi Key Laboratory of Disaster Prevention and Structural Safety Scientific Research Center of Engineering Mechanics Guangxi University Nanning530004 China Guangxi Bossco Environmental Protection Technology Co. Ltd Nanning530007 China Guangxi Key Laboratory of Road Structure and Materials Guangxi Transportation Science and Technology Group Co. Nanning530007 China Changsha University of Science and Technology China

Critical to environmental protection is the non-hazardous utilization of municipal solid waste incinerator (MSWI) fly ash in the construction of waste-free city. In this study, the effects of alkali equivalent, water-binder ratio, sintered MSWI fly ash content, and MK content on the mechanical properties of alkali-activated sintered MSWI fly ash concrete were explored to optimize mix proportion. The hydration mechanism of the concrete was subsequently analyzed in light of this. Likewise, failure mode, stress-strain relationship, and constitutive model of the concrete were investigated. Results showed that the optimal proportion for the concrete was determined to be 1% alkali equivalent, 0.43 water-binder ratio, 30% sintered MSWI fly ash content, and 20% MK content, which exhibited great mechanical properties and microstructure, and also facilitated the reuse of MSWI fly ash. Additionally, alkali-activated sintered MSWI fly ash delayed crack development and increased the peak stress, elastic modulus, ductility, and energy dissipation capacity of the concrete. Furthermore, a modified constitutive model under uniaxial compressive for the concrete was developed, which effectively reflect the stress-strain relationship when various water-binder ratios and sintered MSWI fly ash contents. The research serve as a guide for the utilization of MSWI fly ash in building materials. © 2024, The Authors. All rights reserved.

关键词： Fly ash

来源：评论

学校读者我要写书评

暂无评论

Remote Sensing Time Series Analysis:A Review of Data and Applications

Journal of Remote Sensing

引用

Journal of Remote Sensing 2024年第1期4卷 34-66页

作者： Yingchun Fu Zhe Zhu Liangyun Liu Wenfeng Zhan Tao He Huanfeng Shen Jun Zhao Yongxue Liu Hongsheng Zhang Zihan Liu Yufei Xue Zurui Ao School of Geography South China Normal UniversityGuangzhouGuangdong 510631China Department of Natural Resources and the Environment University of ConnecticutStorrsCT 06269USA Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100094China Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology International Institute for Earth System ScienceNanjing UniversityNanjingJiangsu 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application NanjingJiangsu 210023China Hubei Key Laboratory of Quantitative Remote Sensing of Land and Atmosphere School of Remote Sensing and Information EngineeringWuhan UniversityWuhan 430079China School of Resource and Environmental Sciences Wuhan UniversityWuhanHubei 430079China School of Marine Sciences Sun Yat-sen UniversityZhuhaiGuangdong 519082China School of Geography and Ocean Science Nanjing UniversityNanjingJiangsu 210023China Department of Geography The University of Hong KongPokfulamHong KongChina School of Artificial Intelligence Anhui UniversityHefeiAnhui 230601China Beidou Research Institute Faculty of EngineeringSouth China Normal UniversityGuangzhou 510631China

Remote sensing time series research and applications are advancing rapidly in land,ocean,and atmosphere science,demonstrating emerging capabilities in space-based monitoring methodologies and diverse application *** prompts a comprehensive review of remote sensing time series observations,time series data reconstruction,derived products,and the current progress,challenges,and future directions in their *** high-frequency new data,i.e.,a constellation strategy,increasing computing power and advancing deep learning algorithms,are driving a paradigm shift from traditional point-in-time mapping to near-real-time monitoring tasks,and even to modeling integration of parameter inversion and prediction in land,water,and air ***,the 3 main projects,namely,the Global Climate Observing System,the United States Geological Survey/National Aeronautics and Space Administration(USGS/NASA)Landsat science team,and the China Global Land Surface Satellite(GLASS)team,along with other time series-derived products,have found widespread applications in the research of Earth’s radiation balance and human-land *** have also been utilized for tasks such as land use change detection,assessing coastal effects,ocean environment monitoring,and supporting carbon neutrality ***,the 3 critical challenges and future directions were highlighted including multimode time series data fusion,deep learning modeling for task-specific domain adaptation,and fine-scale remote sensing applications by using dense time *** review distills historical and current developments spanning the last several decades,providing an insightful understanding into the advancements in remote sensing time series data and applications.

关键词： time series analysis ocean science constellation strategyincreasing computing power land science derived products data reconstruction remote sensing series data reconstructionderived

来源：评论

学校读者我要写书评

暂无评论

Abundant and rare subcommunity assemblages of prokaryotes and eukaryotes controlled by vertical environmental heterogeneity in an urban reservoir

引用

Water science and engineering 2025年

作者： Wang, Xun Cao, Huai-yu Gan, Jia-wen Liu, Tang Wang, Pei-fang Yuan, Qiu-sheng Xing, Xiao-lei Du, Cheng-gong Zheng, Yu-ran Liu, Yun-xin Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education and College of Environment Hohai University Nanjing210098 China School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen518055 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen518060 China Yunnan Provincial Key Laboratory of Carbon Sequestration and Pollution Control in Soils Faculty of Environmental Science and Engineering Kunming University of Science and Technology Kunming650500 China Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake Huaiyin Normal University Huai'an223300 China

Reservoirs play a critical role in addressing water resources challenges. However, their vertical influence on the assembly mechanisms of different microbial communities, including prokaryotes and eukaryotes, remains unclear. This study examined the vertical diversity patterns of abundant and rare subcommunities of prokaryotes and eukaryotes in an urban reservoir, using water depth as a geographical gradient and employing high-throughput sequencing. The impact of vertical environmental heterogeneity on community structure was quantified, and key drivers of these dynamics were identified. The results indicated that the urban reservoir exhibited statistically significant differences in the vertical distribution of water temperature and oxidation/reduction potential. The α-diversity of the abundant subcommunity displayed an opposing vertical pattern compared to that of the rare subcommunity, while the β-diversity for both subcommunities of prokaryotes and eukaryotes increased with water depth. Moreover, the distinct diversity patterns of abundant and rare subcommunities were associated with environmental heterogeneity and species adaptability. Notably, the β-diversity of the rare subcommunity of eukaryotes was primarily driven by species turnover in surface water, whereas nestedness became the dominant factor in deeper water. Furthermore, eukaryotic microbes exhibited a more pronounced response to changes in water depth than prokaryotes, consistent with the importance of heterogeneous selection to the eukaryotic community. Water temperature significantly affected the community composition of all groups, highlighting its importance in shaping community dynamics. This study provides valuable insights into the vertical distribution and assembly mechanisms of microbial communities in urban reservoirs, contributing to the protection and management of aquatic ecosystems under river regulation. © 2025 Hohai University

关键词： Biotic

来源：评论

学校读者我要写书评

暂无评论

Significant Adsorption of Benzo(A)Pyrene from Particulate Matter in Smoked by Composite Films: Characteristics, Application Effects and Mechanisms

SSRN

引用

SSRN 2023年

作者： Lu, Jingnan Cai, Kezhou Ren, Chong Wang, Ran Feng, Xinrui Xu, Baocai Engineering Research Center of Bio-process Ministry of Education Hefei University of Technology Hefei230009 China CAS Key Laboratory of Urban Pollutant Conversion Department of Environmental Science and Engineering University of Science and Technology of China Hefei230026 China School of Food and Bioengineering Hefei University of Technology Hefei230009 China

Levels of particulate matter from combustion are an important indicator for assessing air quality, with benzo(a)pyrene (BaP) formed by incomplete combustion of wood adhering to particulate matter and migrating into the atmosphere. Despite the increasing human understanding of the hazards of BaP exposure, there is still a significant research gap on BaP originating from particulate matter in smoky environments and less attention has been paid to removing particulate matter to reduce BaP. This experiment investigated the removal of BaP from the environment affected by particulate matter using starch-based films, comparing the effects of different composite starch films. Firstly, the method characterized the starch matrix films, microstructural and functional group analysis showed that the composite films removed BaP by physical adsorption. The three-dimensional mesh structure of the composite films provided a large number of adsorption sites for BaP adsorption on PM2.5 (91.6%-93.6%) and PM10 (33.8%-35.6%). The adsorption data combined with kinetic modelling elucidated film diffusion and intra-particle diffusion as the adsorption mechanism of the starch films. Simultaneously, this starch film has the ability to be recycled, making it a promising sorbent for reducing particulate matter and BaP emissions. © 2023, The Authors. All rights reserved.

关键词： Barium compounds

来源：评论

学校读者我要写书评

暂无评论

Pb0 Flue Gas Biosorption in Denitrifying Mbfr: Characteristics and Binding Ability of Extracellular Polymeric Substances

SSRN

引用

SSRN 2022年

作者： Chen, Zhuoyao Huang, Zhenshan Liu, Haixu Wang, Huiying Wei, Zaishan School of Environmental Science and Engineering Sun Yat-sen University Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou510275 China

Pb 0 in flue gas which poses a certain threat to human and ecology, is ubiquitous in the environment. In this investigation, the characteristics and heavy metals-binding ability of four EPS fractions which critically affected the heavy metals adsorption performance were evaluated. The EPS were extracted from the denitrifying-membrane biofilm reactor (denitrifying MBfR) and divided into slime EPS (S-EPS), loosely-bound EPS (LB-EPS), tightly-bound EPS (TB-EPS) and EPS in circulating flow (Y-EPS). The characteristics of EPS indicated that TB-EPS owned higher content and concentration of protein compared to S-EPS and LB-EPS. Accordingly, TB-EPS (8.87 mg·g -1 VSS) exhibited stronger adsorption capacity during Pb 0 flue gas treatment, compared to S-EPS (4.57 mg·g -1 VSS) and LB-EPS (0.45 mg·g -1 VSS). Additionally, Pb adsorption was due to complexation with aromatic protein, protein-like containing tryptophan and hydrophobic acids ligands in TB-EPS, rather than that with aromatic protein, tryptophan in S-EPS, LB-EPS. Among these ligands, proteins related ligands were more effective. The functional groups (such as O-H, N-H, C-H and C=C) and loose structure of proteins contributed to the Pb adsorption during the Pb 0 flue gas treatment. This study enlightens the researchers on the bio-treatment and EPS-dependent biosorption of Pb 0 in flue gas in denitrifying MBfR. © 2022, The Authors. All rights reserved.

关键词： Proteins

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：