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SSRN 2024年

作者： Liu, Rui Liu, Yang Wen, Mengmeng Guo, Tianqi Zhang, Shaohong Zhao, Fazhu Wang, Jun State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation Chinese Academy of Sciences Ministry of Water Resources Yangling712100 China Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity College of Urban and Environmental Science Northwest University Xi’an710127 China Shaanxi Key Laboratory for Carbon Neutral Technology Northwest University Xi’an710127 China College of Chemistry and Chemical Engineering Dezhou University Dezhou253023 China

AbstractLong-term diversified crop rotations are known to alter soil carbon fractions, but the mechanisms through which soil microbial functional genes and associated communities regulate carbon fractions remain unclear. The present study examined impacts of long-term crop rotational regimes on soil carbon fractions, soil microbial carbon degradation genes, and associated communities in the Loess Plateau. Crop rotation involving corn and alfalfa-potato significantly enhanced soil carbon fractions including soil organic carbon, particulate organic carbon, potential carbon mineralization, and microbial biomass carbon. Soil total nitrogen and bulk density were identified as primary regulators of soil microbial carbon degradation genes and associated communities. Soil carbon degradation genes and microbial diversity were positively correlated with soil carbon fractions. Moreover, lignin and cellulose degradation functional genes including ligB and bglX play a key role in the formation of soil carbon fractions. This research sheds light on the vital role of long-term crop rotation in regulating soil carbon fractions by impacting soil microbial functional genes and associated communities. The findings provide valuable insights for enhancing sustainable agricultural practices and soil management strategies. © 2024, The Authors. All rights reserved.

关键词： Crop rotation

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Uv Light Irradiation Enhanced Ga Doped Zno Gas Sensor for Ultra-High Response to N-Butanol

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SSRN 2023年

作者： Wang, Tingzhan Chen, Jingkun Chen, Jiaxuan Yao, Xuan Chen, Gang Jiao, Zheng Zhao, Jing-Tai Cheng, Shuai Yang, Xue-Chun Li, Qianli School of Environmental and Chemical Engineering Shanghai University Shanghai200444 China School of Materials Science and Engineering Shanghai University Shanghai200444 China Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology Guilin541004 China

The n-butanol gas sensor suffers from low response and selectivity. Photo-activation is a promising approach to enhance the response signal of ZnO-based sensor. Herein, we synthesized the Ga-doped ZnO (ZOG) sensor by one-step hydrothermal treatment and subsequent calcination. The oxygen vacancies content in 1-ZOG has increased by 46% compared to pure ZnO. Rich oxygen vacancies can increase the response signal of 1-ZOG to 174.78 in darkness for 100 ppm n-butanol, which is 2.4 times that of ZnO. Furthermore, under UV irradiation, the response of 1-ZOG sensor to 100 ppm n-butanol is 3.6 times that of pure ZnO, up to 636.81. The response signal of 1-ZOG to n-butanol is at least 6.32 times that of other gases under UV light, showing ultra-high selectivity. This study provides a novel strategy for the design of highly response and selectivity photo-activation gas sensors. © 2023, The Authors. All rights reserved.

关键词： Zinc oxide

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PM2.5-O3 Compound Pollution Pattern Recognition Based on Hybrid Model of tensor Decomposition and Spectral Clustering

PM2.5-O3 Compound Pollution Pattern Recognition Based on Hyb...

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Digital Society and Intelligent Systems (DSInS), International Conference on

作者： Wanhua Li Dongmei Hu Yafei Guo Jiaqi Dong MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering The North China Electric Power University Beijing China Engineering Research Center of Clean and Low-Carbon Technology for Intelligent Transportation Ministry of Education School of Environment Beijing Jiaotong University Beijing China

Clustering intra-urban areas with the same pollution characteristics can help to accurately manage intra-urban air pollution. In this study, a new classification model for PM 2.5 -O 3 composite pollution features is established based on tensor decomposition and spectral clustering methods. The tensor decomposition was utilized to extract pollution features from massive air pollutant concentration data, and the pollution concentration data were decomposed into day-by-day, intra-day, and spatial modes, which provided a low-dimensional space for the subsequent spectral clustering and fine clustering classification process of the urban spatial-scale PM 2.5 -O 3 composite pollution conditions. The model is explored by taking the annual PM 2.5 and O 3 pollution conditions in Beijing in 2017 and 2020 as an example, discussing the differences in geographic locations and pollution characteristics between the different models, and explaining the changes in the city’s pollution characteristics from 2017 to 2020. Through this new hybrid method, scientific support can be provided for urban refinement and precise management.

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Energy Conversion and Stress Distribution During Impacts of Hyperelastic Spheres on Water and Rigid Surfaces

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SSRN 2023年

作者： Yang, Liu Wei, Yingjie Rao, Zhonghao Kang, Huifeng School of Energy and Environmental Engineering Hebei University of Technology Tianjin300401 China Hebei Key Laboratory of Thermal Science and Energy Clean Utilization Hebei University of Technology Tianjin300401 China School of Astronautics Harbin Institute of Technology Harbin150001 China Key Laboratory of Micro Spacecraft Technology of Hebei Province North China Institute of Aerospace Engineering Langfang065000 China Key Laboratory of Trans-media Aerial Underwater Vehicle of Hebei Province North China Institute of Aerospace Engineering Langfang065000 China

Water entry in the aerospace field is facing great challenges for impact overload and water resistance. This paper aims to assess the impact responses of hyperelastic materials with the potential to effectively reduce loads and drag during water impacts. Over a single deformation cycle, the mechanisms of energy conversion and stress distribution induced by the deformation behaviors of hyperelastic spheres impacting rigid and water surfaces are investigated using experimental and numerical methods. By comparing the impact events of rigid spheres, the impact resistance of the hyperelastic spheres is evaluated by analyzing the elastic waves propagating. The results show that the energy loss into the fluid is responsible for more kinetic energy loss during the water impact of hyperelastic spheres. The drag reduction effect of hyperelastic spheres depends on the deformation behaviors during water entry. Additionally, an analysis is conducted on the strain energy density of hyperelastic spheres during the first deformation cycle. The initial change in kinetic energy is studied as a function of the dimensionless ratio of material shear modulus to impact hydrodynamic pressure. © 2023, The Authors. All rights reserved.

关键词： Spheres

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The Microbial Oxidation of Pharmaceuticals in an Anaerobic Aqueous Environment: Effect of Isolated Fractions of Dissolved Organic Matter from Different Sources

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SSRN 2023年

作者： Li, Qingshan Bu, Qingwei Bai, Zhuoshu Wu, Xiaoze Cao, Hongmei Yang, Lei Tang, Jianfeng School of Chemical & Environmental Engineering China University of Mining & Technology-Beijing Beijing100083 China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Science Chinese Academy of Sciences Beijing100085 China Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China

Hyporheic zones are characterized by high contents of dissolved organic matter (DOM) which consists of different fractions with distinct physiochemical properties. How the effect of diverse DOM fractions on the biodegradation of pharmaceuticals under reducing conditions is scarcely known. To address this knowledge gap, we explored the effect of fractions of DOMs collected from four different sources on the anaerobic microbial oxidation of two typical pharmaceuticals, i.e., ritonavir (RTV) and tetracycline (TC) by using simulated anaerobic microcosms. Humic acid and fulvic acid fractions from allochthonous DOM were found to promote the biodegradation of TC (12.2% per mgC/L) and RTV (14.5% per mgC/L), and hydrophilic fractions had no significant influence. However, algal-derived DOM from autochthonous DOM promoted the biodegradation of TC (4.17% per mgC/L) and inhibited the biodegradation of RTV. The level of humification and aromatization of DOM fractions increased had a positive contribution to pharmaceuticals biodegradation. Further, the promotive mechanism was explained by response of quinone moieties in DOM as extracellular electron acceptors that yields more energy to support microbial metabolism. These results provide a more comprehensive understanding of diverse DOM fractions mediating microbial anaerobic oxidation of trace organic contaminants and extend the insight into contamination control and remediation technology. © 2023, The Authors. All rights reserved.

关键词： Biodegradation

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A review on thermal application of metal foam

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science China(Technological sciences) 2020年第12期63卷 2469-2490页

作者： CHEN Kang GUO LieJin WANG Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Institute of Solar Engineering Technology Northwest Engineering Corporation LimitedPowerChinaXi’an 710065China School of Environmental Science and Engineering Donghua UniversityShanghai 201620China

Heat exchangers embedded with metal foam are drawing increasing attention in the thermal application field,due to the performance of low density,large ratio of surface area to volume as well as high thermal conductivity. In these applications,compact heat exchanger,solar thermal facilities and thermal energy storage are the three core components. This paper focuses on the lasted advances in thermal applications,presenting a review of theoretical and experimental progress over metal foam in thermal application. The empirical and theoretical models for pressure drop,heat transfer coefficient and performance evaluation criteria of compact heat exchangers with metal foam are reviewed and discussed,especially different optimized *** is a trade-off between heat transfer enhancement and increase of pressure drop. Some exploratory work performed by present authors are also introduced. The manufacturing,heat transfer and flow characteristics of tube bundle wrapped with metal foam are taken into account for optimization of heat exchanger. It is confirmed that the conversion mechanism of heat transfer is carried out that heat conduction is the dominative term at high dimension permeability. The correlations of heat transfer rate and pressure drop for staggered and single row tube bundle wrapped with metal foam are concluded,respectively. The effects of different bonding methods are revealed for point-contact in metal foam and base tube. The powder-sintering method can provide a stable and minimum-thickness bonding layer. Various types of solar thermal facilities utilized metal foam to improve the energy conversion efficiency from solar radiant energy to thermal energy are also reviewed and discussed,including solar collector for intermediate-low temperature utilization and solar receiver for high temperature utilization. The Last but not least,existing and future metal foam thermal application stations are overviewed.

关键词： metal foam heat transfer enhancement solar thermal facilities thermal energy storage

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Heating Characteristics and Economic Analysis of a Controllable On-Demand Heating System Based on Off-Peak Electricity Energy Storage

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Journal of Thermal science 2020年第2期29卷 343-351页

作者： YIN Shaowu SHI Yongle TONG Lige LIU Chuanping WANG Li DING Yulong School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Energy Saving and Emission Reduction in Metallurgical Industry University of Science and Technology BeijingBeijing 100083China College of Chemical Engineering University of BirminghamBirmingham B152TTUK

The working principle of a controllable on-demand heating system based on off-peak electricity energy storage(COHSBOEES) is as follows: the cheap off-peak electricity energy is converted into heat energy for storage in the evening, and the heat energy can be extracted on demand for heating during daytime peak or flat electricity periods. This technology can promote the smooth operation of the power grid, solve the problem of peak regulation for the electrical network, and promote renewable energy consumption. Based on the controllable on-demand heating strategy, a COHSBOEES for a heating area of 1000 m^2 was designed and built. Variations in the energy consumption and operating cost of the COHSBOEES in different heating situations were analyzed. The results showed that, off-peak electricity energy storage for heating was energy saving in comparison with central heating when the heating intensity of the COHSBOEES was 70 W/m^2 and the on-demand heating rate was less than 73.0%, and the off-peak electricity energy storage for heating was energy saving at any on-demand heating rate when the COHSBOEES had a heating intensity of 50 W/m^2. After the COHSBOEES has been running for three complete heating seasons, when the off-peak electricity price was 0.25 yuan/kW·h, the energy consumption cost of the COHSBOEES can be saved by 77.6% in comparison with central heating.

关键词： energy storage on-demand heating off-peak electricity heating characteristics heat storage characteristics

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engineering Mesoporous Nascent Mno2 Colloids for Efficient Elimination of Emerging Organic Contaminants

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SSRN 2023年

作者： Liu, Zhuoyue Cheng, Dong Yin, Haochen Zhao, Jianghao Zhang, Jiale Chen, Rongzhi Yang, Shengjiong Wei, Jing Wang, Gen School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology Xi’an710055 China The Key Laboratory of Biomedical Information Engineering Ministry of Education State Key Lab of Transducer Technology School of Life Science and Technology Xi’an Jiaotong University Xi’an710049 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100049 China

Nascent MnO2 colloids produced during permanganate oxidation process is highly oxidative and appealing for the oxidation of emerging organic contaminants (EOCs). However, the nascent MnO2 colloids usually show dense bulked structure which blocks the availability of the active sites and further enhancement of the reactivity. Herein, spherical nascent MnO2 colloids with mesoporous structure were synthesized via redox reactions between colloidal nanospheres of plant polyphenol (e.g., tannic acid) and permanganate. The mesoporous nascent MnO2 colloids shows highly exposure of active sites with abundant of surface-Mn (III) (16.2 mol%), and thus exhibits outstanding oxidation performance towards the oxidation of EOCs. Complete removal of bis-phenol A (BPA, 10 mg/L) was obtained with 1.0 mM of mesoporous nascent MnO2 colloids in 40 min at neutral pH. Mechanism study reveals that both Mn(III) and Mn(IV) contribute to the oxidation of BPA. The presence of surface-Mn(III) greatly promotes the reactivity of the mesoporous nascent MnO2 colloids, leading to a high kinetic of 0.12 min−1 during the initial 10 min. The nascent mesoporous MnO2 colloids exhibits high selectivity toward electron rich EOCs and good performance in complicated water matrix, revealing a promising potential for further application. This work provides a distinct case for engineering novel structured nascent MnO2 colloids for efficient elimination of EOCs in water. © 2023, The Authors. All rights reserved.

关键词： Oxidation

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An Energy-Efficient Solution to Sludge Drying and Combustion Process Through Camellia Oleifera Shells Amended Foaming

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SSRN 2023年

作者： Zhao, Cheng Huang, Jing Yang, Zhaohui Huang, Zhongliang Li, Changzhu Li, Hui Wu, Zijian Zhang, Xuan Qin, Xiaoli Yao, Shirong Ruan, Min School of Energy and Power Engineering Changsha University of Science & Technology Changsha410076 China State Key Laboratory of Utilization of Woody Oil Resource Hunan Academy of Forestry Hunan Changsha410004 China College of Environmental Science and Engineering Hunan University Changsha410082 China

Foaming pretreatment has been proved to be effective in promoting sludge drying, however, the variation of sludge properties significantly influences the foaming efficiency. Inspired by foam stabilizer of solid particles, Camellia oleifera shells (COS) was screened out from various biomasses as its potential on promoting the sludge foaming. For the introduce of COS, this study analyzed the drying behaviors of foamed sludge, quantified the surface cracks information, characterized the combustion performance, and evaluated the energy consumption. The results indicated that about 50% of time could be saved in foaming the sludge to 0.70 g/mL by addition of 3.0 wt% COS. Compared with the original sludge (OS), the 0.70 g/mL foamed sludge saved 47.43% of time for sludge drying at 80 oC, and this value further increased to 53.14% with 3.0 wt% COS addition. Combining the multifractal spectra and drying kinetics analysis, the foaming promoted the formation of complex surface cracks in the warm-up period, while COS further improved the complexity of cracks in the constant rate period, and the shrinkage of isolated sludge blocks in the falling rate period, thus enhanced the moisture diffusion and heat transfer. Furthermore, the appropriate porous structure and additional volatile matters promoted the combustion performance. The 0.90 g/mL foamed sludge with COS presented the lowest activation energy of 180.362 kJ/mol in combustion. Overall, compared with OS, the 0.70 g/mL foamed sludge with COS saved 40.65% energy consumption in the foaming, drying and combustion process, which provided an energy-efficient solution for the sludge treatment and disposal. © 2023, The Authors. All rights reserved.

关键词： Energy utilization

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High-efficiency genome editing of an extreme thermophile Thermus thermophilus using endogenous type I and type III CRISPR-Cas systems

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mLife 2022年第4期1卷 412-427页

作者： Jinting Wang Junwei Wei Haijuan Li Yingjun Li State Key Laboratory of Agricultural Microbiology and College of Life Science and Technology Huazhong Agricultural UniversityWuhanChina Shenzhen Institute of Nutrition and Health Huazhong Agricultural UniversityShenzhenChina Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhenChina College of Biological and Environmental Engineering Xi'an UniversityXi'anChina

Thermus thermophilus is an attractive species in the bioindustry due to its valuable natural products,abundant thermophilic enzymes,and promising fermentation ***,efficient and versatile genome editing tools are not available for this *** this study,we developed an efficient genome editing tool for *** HB27 based on its endogenous type IB,I-C,and III-A/B CRISPR-Cas ***,we systematically characterized the DNA interference capabilities of the different types of the native CRISPR-Cas systems in *** *** found that genomic manipulations such as gene deletion,mutation,and in situ tagging could be easily implemented by a series of genome-editing plasmids carrying an artificial self-targeting mini-CRISPR and a donor DNA responsible for the recombinant *** also compared the genome editing efficiency of different CRISPR-Cas systems and the editing plasmids with donor DNAs of different ***,we developed a reporter gene system for *** based on a heat-stableβ-galactosidase gene TTP0042,and constructed an engineered strain with a high production capacity of superoxide dismutases by genome modification.

关键词： endogenous CRISPR-Cas system genome editing reporter gene SOD production Thermus thermophilus

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