检索结果-内蒙古大学图书馆

SSRN 2024年

作者： Konkathi, Preethi Li, Xiaojun Fernandez-Moran, Roberto Liu, Xiangzhuo Xing, Zanpin Frappart, F. Piles, Maria Karthikeyan, L. Wigneron, Jean-Pierre Centre of Studies in Resources Engineering Indian Institute of Technology Bombay India Interdisciplinary Programme in Climate Studies Indian Institute of Technology Bombay India INRAE UMR1391 ISPA Villenave d'Ornon88140 France Valencia Spain Cryosphere Research Station on the Qinghai-Tibet Plateau State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resource Chinese Academy of Sciences Gansu Lanzhou730000 China

The Soil Moisture Ocean Salinity (SMOS) mission carries on-board the first L-band radiometer launched in 2010 to retrieve global-scale soil moisture (SM) and Vegetation Optical Depth (L-VOD). SMOS-IC version-2 is the latest retrieval algorithm of SMOS over the land surfaces, and it outperforms other existing SMOS retrieval algorithms. Research is underway to improve it by refining the surface roughness parameters which significantly affect the retrieval performance of SM and L-VOD. In this study, we present a new version (Version 2.1) of SMOS-IC SM and L-VOD retrievals featuring novel calibrations of global soil roughness. For this purpose, we first retrieved SM and surface roughness (through the Hr parameter) over bare soils using the SMOS-IC algorithm. A Random Forest (RF) model was then developed to predict Hr over bare soils, using soil data (soil textural properties and soil temperature) and terrain data as explanatory variables, which ultimately facilitated the extrapolation of these Hr values to a global *** predicted Hr from the RF model demonstrated very good correspondence with the retrieved Hr over bare soils (R2 = 0.89). The observed dominant influence of soil properties, particularly soil organic content (SOC), indicated the influence of litter content on the modeling of Hr. The newly developed global Hr map of SMOS-IC V2.1 indicated a high spatial variability of Hr within each IGBP land cover type. Intercomparison using in-situ SM data from ISMN revealed improved performance of SMOS-IC V2.1 vs SMOS-IC V2 and CCI, with higher correlation R (R_SMV2.1 = 0.69, R_SMV2 = 0.67, and R_SMCCI = 0.62) and lower ubRMSE (ubRMSE_SMV2.1 = 0.057 m3/m3, ubRMSE_SMV2 = 0.060 m3/m3 and ubRMSE_SMCCI = 0.059 m3/m3). Moreover, Triple Collocation Analysis (TCA) evaluations using the ECMWF-modelled SM as a reference dataset yielded improved performance of SMV2.1 over SMV2 in most regions of the globe, especially for ubRMSE. In terms of L-VOD, the VODV2.1 product outperfo

关键词： Soil moisture

来源：评论

学校读者我要写书评

暂无评论

System Analysis on Supercritical CO_2 Power Cycle with Circulating Fluidized Bed Oxy-Coal Combustion

引用

Journal of Thermal science 2019年第3期28卷 505-518页

作者： SHI Yan ZHONG Wenqi SHAO Yingjuan XIANG Jun Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology

Supercritical carbon dioxide(S-CO_2) Brayton power cycle is a competitive technology to achieve high efficiency in a variety of applications. However, in coal power applications, the CO_2 generated from coal combustion still discharges into the atmosphere causing a series of environment problems. In this work, an 300 MWe S-CO_2 power cycle with circulating fluidized bed(CFB) oxy-coal combustion was established including air separation unit(ASU), CFB boiler, recuperator system and carbon dioxide compression and purification unit(CPU). Based on the material and energy conservation, the cycle efficiency of S-CO_2(620°C, 25 MPa) Brayton power cycle with CFB oxy-coal combustion is evaluated compared to the oxy-coal combustion steam Rankine cycle and S-CO_2 Brayton power cycle with the 31.65 kg/s coal supply. After that, the influence of several factors, e.g., exhaust flue gas temperature, split ratio in recuperator system and the oxygen supply on the cycle efficiency was investigated and analyzed. The results show that the net efficiency of S-CO_2 power cycle with CFB oxy-coal combustion(32.67%) is much higher than the steam Rankine cycle utilizing CFB with 17.5 Mpa, 540°C steam(27.3%), and 25 Mpa, 620°C steam(30.15%) under the same exhaust flue gas temperature. In addition, lower exhaust flue gas temperature and higher split ratio are preferred to achieve higher cycle efficiency. Lower oxygen supply can reduce the energy consumption of ASU and CPU, further increasing the system net efficiency. However, the energy losses of ASU and CPU are still very large in oxy-coal combustion and need to be improved in further work.

关键词： S-CO2 oxy-coal combustion CO2 capture CFB boiler process simulation

来源：评论

学校读者我要写书评

暂无评论

Effect of Alumina-Magnesia Micro Powder Addition on the Linear Change and Slag Resistance of Al2o3-Mgo Refractory Castables

SSRN

引用

SSRN 2022年

作者： Chen, Qingjie Peng, Die Yan, Wen Li, Nan School of Chemistry and Chemical Engineering University of South China Hengyang421001 China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan430081 China School of Resource & Environment and Safety Engineering University of South China Hengyang421001 China

A new alumina-magnesia micro powder (AMMP) consisting of γ-Al 2 O 3 and periclase was utilized to replace α-Al 2 O 3 and magnesia powder to prepare Al 2 O 3 -MgO (spinel-forming) castable. And the effect of AMMP addition (0~9.9wt.%) on the permanent linear change (PLC), apparent porosity, microstructure and slag resistance were analyzed by XRD, SEM and EDS as well as the FactSage® thermal-chemical software. The results indicated that the addition of 3.3~6.6wt% AMMP significantly reduced the PLC, due to the improved sintering and low theoretical volume expansion of in situ spinel formed from γ-Al 2 O 3 and MgO. The slag resistance was also obviously enhanced due to the optimized microstructure, the decreased content and the increased viscosity of penetrated slag. Nevertheless, the excess AMMP content (9.9wt%) not only had no further positive effect on inhibiting volume expansion, but reduced the slag resistance due to the high apparent porosity. Subsequently, samples with 6.6wt% AMMP obtained the optimum performance, which not only had a lower linear change, but also the best slag resistance. © 2022, The Authors. All rights reserved.

关键词： Magnesia

来源：评论

学校读者我要写书评

暂无评论

A Comparison of Dndc and Daycent to Evaluate Greenhouse Gas Emissions from China's Main Cropping Systems

SSRN

引用

SSRN 2023年

作者： Wang, Junyi Kuhnert, Matthias Abdalla, Mohamed Smith, Pete Ding, Weixin Yan, Xiaoyuan Zou, Jianwen Guo, Shiwei Fan, Jianling Jiang, Yanbin Hu, Ronggui Li, Fusheng Guo, Yanbin Chen, Zengming Zhao, Xu Xie, Yingxin Institute of Biological & Environmental Science University of Aberdeen 23 St Machar Drive AberdeenAB24 3UU United Kingdom State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation College of Resources and Environmental Sciences Nanjing Agricultural University Nanjing China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology China Ministry of Agriculture College of Resources and Environment Huazhong Agricultural University Wuhan430070 China College of Agriculture Guangxi University Nanning530004 China Beijing Key Laboratory of Biodiversity and Organic Farming College of Resources and Environmental Sciences China Agricultural University Beijing100193 China National Engineering Research Center for Wheat State Key Laboratory of Wheat and Maize Crop Science Collaborative Innovation Center of Henan Grain Crops Henan Agricultural University Zhengzhou450046 PR China

China contributes the largest share of cropland’s greenhouse gas (GHG) emissions globally. Processed-based biogeochemical models are useful tools to simulate GHG emissions from cropping systems. However, model comparisons are necessary to provide information for the application of models under different climate, soil, and crop conditions. In this study, two widely-used models (DayCent and DNDC) were evaluated and compared under four main cropping systems in China. The field observations from nine experiments were used for model calibration and validation. The DayCent and DNDC models simulated daily and seasonal CH4 emissions from early rice-late rice and rice-wheat cropping systems reasonably well (r2≥0.49 for daily simulation and nRMSE≤52.9% for seasonal simulation). Both models were able to satisfactorily predict seasonal N2O emissions from maize-wheat fields (0.6≤d≤0.8), but overestimated most daily N2O fluxes at fertilisation and irrigation events. Significantly positive relationships were found between simulated and observed cumulative N2O fluxes in spring maize growing season (0.61≤ r2≤0.85). The DNDC showed smaller differences in simulated and observed cumulative GHG emissions for spring maize and double rice, while DayCent showed better performance on estimating N2O and CH4 for maize-wheat and rice-wheat. This study shows that both models have strengths and weaknesses under a variety of cropping systems and growing regions, which are important to consider when choosing a model for a crop/region-specific simulation. © 2023, The Authors. All rights reserved.

关键词： Crops

来源：评论

学校读者我要写书评

暂无评论

Bio-Functional Collagen/Casein/Chitosan Scaffolds Enhanced Nanofiltration Membrane For Acid Recovery

SSRN

引用

SSRN 2022年

作者： Xiao, Pei Li, Xin Li, Lei Liu, Fei Li, Jian Laboratory of Environmental Biotechnology School of Environmental and Civil Engineering Jiangnan University Wuxi214122 China Singapore Membrane Technology Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop CleanTech One Singapore637141 Singapore School of Food Science and Technology State Key Laboratory of Food Science and Technology Jiangnan University Wuxi214122 China

Applications of environmentally friendly and low-cost biomaterials for membrane preparation offers unparalleled advantages over traditional synthetic polymer membrane. Herein, a novel collagen/casein/chitosan composite material was designed to synthesize nanofiltration (NF) membrane for acid recovery from acidic waste stream. A vacuum filtration method was used to precious adjust the thickness of the functional layer while glutaraldehyde was adopted as crosslinking agent to preserve surface charge property of NF membrane at acidic conditions. The electrostatic interactions and hydrogen bonding of these biopolymers endowed the NF membrane with enhanced stability. At optimized conditions with 0.15 ml collagen/casein/chitosan composites decoration, the NF membrane with a functional layer thickness of around 628.4 nm exhibited an excellent acid permeance (U H + =0.034 m h -1 ) and a high H + / Fe 2+ separation factor up to 33.8. This facile strategy provides a useful guideline for constructing highly efficient NF membrane for acid recovery and broaden the application of biomaterials for membrane application at harsh environments. © 2022, The Authors. All rights reserved.

关键词： Collagen

来源：评论

学校读者我要写书评

暂无评论

Unveiling the Enhancement Mechanisms of Algogenic Extracellular Organic Matters on Chlortetracycline Photodegradation: Constitutive Relationships of Compound Components and Reactive Oxygen Species Generation

SSRN

引用

SSRN 2023年

作者： Kang, Longfei Jiang, Yixin Tian, Yajun Zou, Jinru Feng, Li Liu, Yongze Han, Qi Zhang, Liqiu Beijing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University 35 Qinghua East Road Haidian District Beijing100083 China Engineering Research Center for Water Pollution Source Control & Eco-remediation College of Environmental Science and Engineering Beijing Forestry University 35 Qinghua East Road Haidian District Beijing100083 China College of Environment Zhejiang University of Technology ChaowangRoad18 Hangzhou310014 China

Algogenic extracellular organic matters (EOMs) have been found to play a crucial role in the photodegradation of antibiotics. However, the specific molecular structure compositions of EOMs have not been fully characterized, and the intrinsic association between the structure and the production of ROS remains unclear. In this study, EOMs from Chlorella Vulgaris were characterized using FT-ICR-MS. Based on the FT-ICR-MS results, nine representative model compounds (MCs, i.e., benzene, naphthalene, anthracene, phenanthrene, glucose, L-glutamic, triglyceride, tannic and lignin) were applied to investigate the physicochemical properties of EOMs and the ROS changes induced by the photoreaction of chlortetracycline (CTC). With the help of quenching assays, nine MCs were classified into prone-ROS and non-prone-ROS fractions. Prone-ROS compounds generate O2·- upon electron transfer to 3O2, which then produces ·OH after disproportionation to generate hydrogen peroxide. The formation of 1O2 is attributed to energy transfer from prone-ROS to 3O2. Density functional theory revealed that prone-ROS exhibited higher reactivity compared to non-prone-ROS, this finding is as well supported by the result of steady-state photolysis measurement. Our study gives a new insight into photochemical fate of CTC in aquatic environments, providing theoretical basis for assessing antibiotics’ ecological risk accurately. © 2023, The Authors. All rights reserved.

关键词： Risk assessment

来源：评论

学校读者我要写书评

暂无评论

Role of Substituent On Organosulfate and Amide Molecules in the Initial Stage of Atmospheric New Particle Formation

SSRN

引用

SSRN 2024年

作者： Ni, Shuang Li, Xin-Xin An, Guo-Ce Song, Xiao-Ming Zhou, Xin Tang, Yi-Zhen Bai, Feng-Yang Zhao, Zhen Institute of Catalysis for Energy and Environment College of Chemistry and Chemical Engineering Shenyang Normal University Liaoning Shenyang110034 China College of Criminal Science and Technology Criminal Investigation Police University of China Liaoning Shenyang110854 China School of Environmental and Municipal Engineering Qingdao Technological University Qingdao266033 China State Key Laboratory of Heavy Oil Processing China University of Petroleum Chang Ping Beijing102249 China

The role of substituent group in organosulfate (methanesulfonic acid, methyl hydrogen sulfate and hydroxymethanesulfonic acid) and amides formamide, acetamide, methylformamide and urea on structure, thermodynamics, intermolecular forces, atmospheric influence and optical properties was studied. The results show substituents promote the clustering of organosulfate and amide and improve the optical properties. Low temperature, high pressure and high altitude contribute to the formation of clusters, and temperature is the dominate factor. Additionally, organic acid promotes the clustering with organosulfate and amide, and enhances Rayleigh scattering properties, further strengthens the extinction properties of aerosols to affect atmospheric visibility. © 2024, The Authors. All rights reserved.

关键词： Amides

来源：评论

学校读者我要写书评

暂无评论

Vertical Distribution and Source Analysis of Aerosols, Nitrogen Dioxide, and Formaldehyde in the Island and Inland Regions Over the Yangtze River Delta, China

SSRN

引用

SSRN 2023年

作者： Ou, Jinping Hu, Qihou Xing, Chengzhi Zhu, Yizhi Feng, Jiaxuan Ji, Xiangguang Wang, Xinqi Lin, Hua Liu, Cheng The Department of Health Promotion and Behavioral Sciences School of Public Health Anhui Medical University Anhui Hefei230032 China Key Lab of Environmental Optics and Technology Anhui Institute of Optics and Fine Mechanics Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei230031 China School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215009 China Anhui University Institute of Material Science and Information Technology Hefei230601 China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui University Anhui Hefei230601 China Anhui Provincial Academy of Eco-Environmental Science Research Hefei230071 China School of Environmental Science and Optoelectronic Technology University of Science and Technology of China Hefei230026 China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei230026 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of China Hefei230026 China

In order to explore the regional distribution characteristics of air pollutants in the Yangtze River Delta region (YRD), Zhoushan (ZS) and Nanjing (NJ) regions were selected as the representatives of the island and inland regions, respectively. This study investigated the summertime vertical distributions and source distributions of aerosols, nitrogen dioxide (NO2), and formaldehyde (HCHO) in the YRD from May to July 2019 using multi-axis differential optical absorption spectroscopy (MAX-DOAS), Weather Research and Forecasting (WRF), and potential source contribution function (PSCF) models. The results showed that the aerosol extinction coefficients in the YRD region exhibited a Gaussian distribution, whereas those of NO2 and HCHO decreased exponentially. However, NO2 and HCHO showed high values in the 1.5-3 km range, which regional transmission contributions may have influenced. Affected by the different intensities of traffic emission sources, aerosols, NO2, and HCHO in the island and inland regions show different diurnal variation characteristics. Moreover, HCHO in the ZS and NJ sites was significantly higher on weekends than on weekdays, indicating that HCHO in the YRD was significantly affected by human activities. The vertical meteorological profile and correlation analysis confirmed that the ZS site was significantly affected by sea breezes. In addition, aerosols, NO2, and HCHO in Nanjing were greatly affected by transportation from inland regions. The aerosols of Zhoushan were easily affected by the transport of pollutants in the Yellow Sea and East China Sea, whereas NO2 and HCHO were greatly affected by the transport contribution of the inland surrounding regions. This study provides significant guidance for preventing and controlling air pollutants on islands and inland regions. © 2023, The Authors. All rights reserved.

关键词： Aerosols

来源：评论

学校读者我要写书评

暂无评论

Effect of Alumina-Magnesia Micro Powder Addition on the Linear Change and Slag Resistance of Al2o3-Mgo Refractory Castables

SSRN

引用

SSRN 2022年

A new alumina-magnesia micro powder (AMMP) consisting of γ-Al 2 O 3 and periclase was utilized to replace α-Al 2 O 3 and magnesia powder to prepare Al 2 O 3 -MgO (spinel-forming) castable. And the effects of AMMP content (0~9.9wt.%) on the permanent linear change (PLC), apparent porosity, microstructure and slag resistance were analyzed by XRD, SEM and EDS as well as the FactSage® thermal-chemical software. The results indicated that the addition of 3.3~6.6wt% AMMP significantly reduced the PLC, due to the improved sintering and low theoretical volume expansion of in situ spinel formed from γ-Al 2 O 3 and MgO. The slag resistance was also obviously enhanced due to the optimized microstructure, the decreased content and the increased viscosity of penetrated slag. Nevertheless, the excess AMMP content (9.9wt%) not only had no further positive effect on inhibiting volume expansion, but reduced the slag resistance due to the high apparent porosity. Subsequently, samples with 6.6wt% AMMP obtained the optimum performance, which not only had a lower PLC, but also the best slag resistance. © 2022, The Authors. All rights reserved.

关键词： Magnesia

来源：评论

学校读者我要写书评

暂无评论

Ingenious Design of One Mixed-Valence Dual-Net Copper Metal-Organic Framework for Deriving Cu2o/Cuo Heterojunction with Highly Electrocatalytic Performances from No3- to Nh3

SSRN

引用

SSRN 2022年

作者： Li, Zuo-Xi Du, Feng Cui, Guang-Hua Yang, Bo-Long Zhang, Da-Shuai Song, Rui-Feng Institute of Materials Science and Devices School of Material Science and Engineering Suzhou University of Science and Technology Jiangsu Suzhou215009 China CollegeCollege of Chemical Engineering Hebei Key Laboratory for Environment Photocatalytic and Electrocatalytic Materials North China University of Science and Technology No. 21 Bohai Road Hebei Caofeidian New-City Tangshan063210 China CollegeCollege of Chemistry and Chemical Engineering Dezhou University Dezhou253023 China School of Chemistry and Life Sciences Suzhou University of Science and Technology Jiangsu Suzhou215009 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China

In the beginning, a 1D chain [CuI(bib)]∞ (MOF-ZX1) and 2D layer [(CuII)2(ipa)2]∞ (MOF-ZX2) are assembled from Cu(NO3)2·3H2O with 1,4-bis(imidazol-1-yl)benzene (bib) and isophthalic acid (H2ipa), respectively. Then we perceive a 1D/2D intercalated network MOF-ZX3 by one-pot reaction of Cu(NO3)2·3H2O with bib and H2ipa, which presents ingenious integration of 1D chain [CuI(bib)]∞ and 2D layer [(CuII)4(OH)2(ipa)4]∞. The copper species of 1D and 2D architectures own +1 and +2 valences, and so Cu2O@C and CuO@C are synthesized from fast microwave-assistant pyrolysis of MOF-ZX1 and MOF-ZX2 precursors, respectively. Interestingly, MOF-ZX3 is a mixed-valence dual-net copper metal-organic framework (Cu-MOF), which is liable to derive Cu2O/CuO@C composite, which is comprised of copper-oxide heterojunction and carbon substrate. Then we use such CuxO@C composites as catalysts for electrochemical NO3– reduction to NH3 (NRA). CuO@C presents the NO3– conversion rate of 31.84%, NH3 Faradaic efficiency of 68.83% and selectivity of 44.18%, while the NRA performance of Cu2O@C is promoted in some extend, and the NO3– conversion rate, NH3 Faradaic efficiency and selectivity are 63.72%, 79.86%, and 77.74%, respectively. For Cu2O/CuO@C heterojunction, the abundant interfacial area and exposed active sites not only enhance the electron transfer, but also speeds up reaction kinetics. Ultimately, Cu2O/CuO@C gives the best activity of NRA, including three outstanding indices: NO3– conversion rate (83.40%), NH3 Faradaic efficiency (93.05%) and selectivity (93.11%). Density functional theory (DFT) calculations disclose that the Cu2O/CuO heterojunction can tune the d-band center of active Cu sites, and thus favorably achieves the fast conversion from NO3− to NH3. This work provides a novel idea to rationally design advanced electrocatalysts, and also fundamental investigation on heterojunction catalysts in NRA. © 2022, The Authors. All rights reserved.

关键词： Copper oxides

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：