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Characteristics of debris flow impact on a double-row slit dam

Journal of Mountain Science 2023年第2期20卷 415-428页

作者： WANG Zhuang LIU Dao-chuan YOU Yong LYU Xiao-bo LIU Jin-feng ZHAO Wan-yu SUN Hao WANG Dong-wei LIU Yang Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu 610041China Sichuan Tongchuan Engineering Technology Development Co. Ltd.Chengdu 610041China State Grid Sichuan Electric Power Transmission&Transformation Construction Co. Ltd.Chengdu 610051China

To accurately predict impact loads can ensure the safe operation of debris flow control *** instantaneous impact process is usually considered in the calculation of the debris flow impact force;however,the redistribution of an impact load after structural regulation is *** this study we deduced the theoretical calculation of a debris flow impact on a double-row slit dam,and carried out a verification experiment on the debris flow *** calculation model considers the influence of the debris flow properties,dam arrangement and pile *** results show that the impact force of the debris flow is obviously affected by the bulk *** the bulk density is 21 kg/m^(3),the maximum impact force on the pile dam is 1.15 times that when the bulk density is 15 kg/m^(3),but the time it takes for the debris flow to pass through the dam body is reduced by 60%.The larger the relative pile spacing,the more sufficient the flow space and the lower the maximum impact *** maximum impact force of relative pile spacing of 0.8 is 12%less than that of elative pile spacing of *** horizontal distribution of the impact force in the mud depth range is *** maximum impact force on the centre pier is 1.3 times that of a side pier,and the maximum impact force on the dam body appears at the top of the mud depth *** the vertical distribution of the impact force,the maximum impact force at the highest mud mark is approximately 70%of that of the *** the increase in the relative pile spacing,the longitudinal maximum impact force distribution first decreases and then increases.

关键词： Debris flow force Slit dam Fluctuations Flume model test

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Investigating the Hydrogen Demand Curve in Road Transport

Investigating the Hydrogen Demand Curve in Road Transport

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International Conference on European Electricity Market, EEM

作者： Lin Zheng Johannes Eckstein Bastian Weißenburger Copernicus Institute of Sustainable Development Utrecht University Utrecht The Netherlands Fraunhofer Institute for Systems and Innovation Research ISI Karlsruhe Germany Chair of Energy Systems Analysis Institute of Energy and Process Engineering ETH Zurich Zurich Switzerland

ISBN: (数字)9798350381740

ISBN: (纸本)9798350381757

Applying hydrogen can potentially decarbonize road transport. This paper introduces a novel approach for deriving hydrogen demand curves in road transport. By analyzing acceptable prices for new vehicle buyers opting for hydrogen and the possible hydrogen demand from these new vehicles, our model provides insights into potential market dynamics. The model is applied to Germany and simulates the total hydrogen demand across 15 price scenarios. The results reveal that hydrogen demand can be expected from passenger transport in 2030 but not in 2045, attributed to the economic viability and increasing availability of electric alternatives. Within freight transport, heavy-duty freight emerges as a key segment with significant potential demand at relatively high acceptable prices. Comparison with a prior study underscores the model's contribution, offering insights into the upper bounds of acceptable hydrogen price.

关键词： Economics Electric potential Analytical models Upper bound Roads Hydrogen Europe

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Sulfur-doped g-C_(3)N_(4)/g-C_(3)N_(4) isotype step-scheme heterojunction for photocatalytic H_(2) evolution

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Journal of Materials Science & Technology 2022年第23期118卷 15-24页

作者： Jizhou Jiang Zhiguo Xiong Haitao Wang Guodong Liao Saishuai Bai Jing Zou Pingxiu Wu Peng Zhang Xin Li School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China Key Laboratory of Rare Mineral Ministry of Natural ResourcesGeological Experimental Testing Center of Hubei ProvinceWuhan 430034China Semiconductor Electronic Special Gas of Hubei Engineering Research Center Jingzhou 434000China Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The rational fabrication of an efficient heterojunction is critical to the enhancement of photocatalytic hydrogen(H_(2)) evolution ***,a new-fashioned graphitic-carbon nitride(g-C_(3) N_(4)) based isotype step-scheme(S-scheme) heterojunction composed of sulfur-doped and sulfur-free active sites is developed by liquid sulfur-mediation of exfoliated g-C_(3) N_(4).Particularly,the liquid sulfur not only contributes to the full contact between sulfur species and exfoliated g-C_(3) N_(4),but also creates sulfur-doping and abundant pores,since self-gas foaming effect of sulfur ***,the S-doped and S-free active sites located in the structural unit of C_(3) N_(4) jointly construct a typical sulfur-doped g-C_(3) N_(4)/g-C_(3) N_(4) isotype step-scheme heterojunction,which endows highly efficient photocatalytic reaction ***,the optimal sample possesses remarkable photocatalytic H_(2) evolution activity(5548.1 μmol g^(-1) h^(-1)) and robust *** importantly,the investigation will open up a new path for the exploration of other carbon-based isotype S-scheme heterojunctions.

关键词： Liquid sulfur S-doping g-C_(3)N_(4) Isotype S-scheme heterojunction Photocatalytic H_(2) evolution

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Pore-corner networks unveiled: Extraction and interactions in porous media

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Physical Review Fluids 2024年第1期9卷 014303-014303页

作者： Ninghua Zhan Yiping Wang Xiang Lu Rui Wu Abdolreza Kharaghani School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Chair of Thermal Process Engineering Otto von Guericke University P.O. 4120 39106 Magdeburg Germany Exploration and Development Research Institute of Shengli Oilfield Company Sinopec Dongying 257000 Shandong China

Generalized network models (GNMs) serve as powerful tools, bridging the intricate gap between pore- and continuum-scale multiphase transport in porous media. An essential step in the development of these models is to extract pore-corner networks from actual porous materials. In this paper, we present a pore-corner-network extraction method involving two steps. In the first step, pore networks, comprising pore bodies interconnected by pore throats, are extracted based on the omnidirectional Euclidean distance concept. Subsequently, corners within each distinct pore unit, consisting of a pore body and half of the connected pore throats, are identified by sweeping the pore unit with a sphere. The radius of the sphere corresponds to the minimal corner radius within the cross-sections at the centers of pore throats within the pore unit. To extract pore-corner networks from three-dimensional images of porous materials efficiently, we introduce a domain decomposition approach. In this approach, the porous material of interest is divided into multiple subdomains, each enveloped by a protective layer. To validate our proposed extraction method, a GNM is developed to simulate evaporation in a porous medium composed of packed spherical beads. This model is systematically compared with microcomputed tomography experimental data. Encouragingly, the modeling results are in good agreement with the experimental data, particularly in terms of the variation of liquid distribution over time. Our proposed extraction method not only contributes to disclosing the structures of pores and corners in real porous media but also benefits the development of GNMs that can be employed to understand in detail the multiphase transport in porous media from the pore-scale perspectives.

关键词： Displacement of immiscible fluids Flows in porous media Granular packing Porous media

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Nattokinase as a functional food ingredient:therapeutic applications and mechanisms in age-related diseases

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Food Science and Human Wellness 2024年第5期13卷 2401-2409页

作者： Hao Wu Qian Zhang Hao Suo Feng Xu Wanxu Huang Dan Ohtan Wang Wuya College of Innovation Shenyang Pharmaceutical UniversityShenyang 110016China College of Optoelectronic Engineering and Institute for Innovative Development of Food IndustryShenzhen UniversityShenzhen 518060China College of Life Sciences and Biopharmaceutical Shenyang Pharmaceutical UniversityShenyang 110016China The Fifth Affiliated Hospital of Guangzhou Medical University Guangzhou 510700China State Key Laboratory of New-tech for Chinese Medicine Pharmaceutical Process Lianyungang 222001China RIKEN Center for Biosystems Dynamics Research Kobe 650-0047Japan Graduate School of Biostudies Kyoto UniversityKyoto 606-8501Japan

Consumption of natto,a traditional eastern Asian food made of fermented soybeans by Bacillus subtilis,has long been linked to healthy aging and longer human *** the key thrombolytic ingredient of natto,the serine protease nattokinase(NK)has been developed into a widely-used dietary *** has shown excellent anti-thrombus,thrombolytic,and anti-inflammation activities that potentially delay aging and provide therapeutic effects on aging-related *** this review,we critically overview the experimental and clinical evidence in the past 20 years that support the beneficial function of NK in the prevention and treatment of aging-related diseases,including cardiovascular diseases,Alzheimer’s disease,other abnormalities and *** focus on the underlying molecular mechanisms and recent advances in application methods that are aimed at further development of NK for healthier aging of modern *** challenges and unsolved issues in this area are also discussed.

关键词： Nattokinase Functional food ingredient Aging-related diseases Cardiovascular diseases Inflammation

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A Local-Global Multi-Scale MLP Network for Plant Leaf Segmentation Based on Context Masking

A Local-Global Multi-Scale MLP Network for Plant Leaf Segmen...

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2023 China Automation Congress, CAC 2023

作者： Ma, Shannong Jiang, Houtao Ru, Fei Fang, Jiangxiong Gu, Huaqi East China University of Technology Jiangxi Engineering Research Center of Process and Equipment for New Energy Nanchang China Baoji Cigarette Factory Shaanxi Tobacco Industry Co.Ltd Baoji China Institute of Intelligent Information Processing Taizhou University Taizhou China Jiangxi Provincial Natural Resources Development Center Nanchang China

ISBN: (纸本)9798350303759

The health status of plant leaves directly reflects whether the plant has healthy growth. By accurately segmenting the leaf area in plant leaf images, real-time monitoring of leaf diseases can be achieved. Although existing Transformer-based segmentation methods can capture long-range dependencies between pixels, they are computationally intensive and do not fully utilize edge information. To address these issues, this paper proposes a local-global Multi-scale MLP network framework, called LGM-MLP. The LGM-MLP architecture comprises an encoder network, an local-global multi-scale MLP module, and a decoder network. The LGM-MLP module divides the input features into two branches: the global multi-scale MLP branch captures long-range dependencies in the image, while the local multi-scale MLP branch focuses on extracting local feature maps. The local-global attention mechanism dynamically adjusts the weights of global and local features. In the decoder network, the CRD module is incorporated into the convolutional layer to enhance the extraction of boundary features. Comparative analysis with U-Net and state-of-the-art models reveals that our proposed method significantly improves the accuracy and efficiency of plant leaf image segmentation. © 2023 IEEE.

关键词： Image segmentation

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Anthropogenic land use substantially increases riverine CO_(2) emissions

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Journal of Environmental Sciences 2022年第8期34卷 158-170页

作者： Shijie Gu Siyue Li Isaac R.Santos School of River and Ocean Engineering Chongqing Jiaotong UniversityChongqing 400074China Key Laboratory of Reservoir Aquatic Environment Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China Chongqing School University of Chinese Academy of SciencesChongqing 400714China Research Center for Environmental Ecology and Engineering Institute of Changjiang Water Environment and Ecological SecuritySchool of Environmental Ecology and Biological EngineeringKey Laboratory for Green Chemical Process of Ministry of EducationKey Laboratory of Novel Reactor and Green Chemical Technology of Hubei ProvinceEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationWuhan Institute of TechnologyWuhan 430205China Department of Marine Sciences University of GothenburgGothenburg 41296Sweden National Marine Science Centre Southern Cross UniversityCoffs HarbourNSW 2450Australia

Carbon dioxide(CO_(2)) emissions from inland waters to the atmosphere are a pivotal component of the global carbon budget. Anthropogenic land use can influence riverine CO_(2) emissions, but empirical data exploring cause-effect relationships remain limited. Here, we investigated CO_(2) partial pressures(pCO_(2)) and degassing in a monsoonal river(Yue River)within the Han River draining to the Yangtze in China. Almost 90% of river samples were supersaturated in CO_(2) with a mean ± standard deviation of 1474 ± 1614 μatm, leading to emissions of 557-971 mmol/m^(2)/day from river water to the atmosphere. Annual CO_(2) emissions were 1.6-2.8 times greater than the longitudinal exports of riverine dissolved inorganic and organic carbon. pCO_(2) was positively correlated to anthropogenic land use(urban and farmland), and negatively correlated to forest cover. p CO_(2) also had significant and positive relationships with total dissolved nitrogen and total dissolved phosphorus. Stepwise multiple regression models were developed to predict p CO_(2) . Farmland and urban land released nutrients and organic matter to the river system, driving riverine p CO_(2) enrichment due to enhanced respiration in these heterotrophic rivers. Overall, we show the crucial role of land use driving riverine pCO_(2) , which should be considered in future large-scale estimates of CO_(2) emissions from streams. Land use change can thus modify the carbon balance of urban-river systems by enhancing river emissions, and reforestation helps carbon neutral in rivers.

关键词： River carbon Inland waters Greenhouse gases Climate change Water quality Headwater streams

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INVESTIGATIONS AND ANALYSIS OF EARTH MATERIALS TOWARDS THE developmentS IN SOME ADVANCED CHEMICAL AND CATALYTIC USES 9th

INVESTIGATIONS AND ANALYSIS OF EARTH MATERIALS TOWARDS THE D...

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9th International Conference on Advanced Materials and Systems, ICAMS 2022

作者： Aluvihara, Suresh Kalpage, C.S. Bandaranayake, P.W.S.K. Bandara, W.M.A.T. Chelaru, Ciprian University of Peradeniya Chemical and Process Engineering Department Peradeniya Sri Lanka University of Peradeniya Physics Department Peradeniya Sri Lanka University of Peradeniya Chemistry Department Peradeniya Sri Lanka The National Research & Development for Textiles and Leather - Leather and Footwear Research Institute Division Bucharest Romania

Earth materials are some sort of valuable resources with some multiples uses in some of industrial purposes and they are obtaining some economical values based upon the demand and the abundance. According to the most of research and experiments that relevant with the characteristics of solid earth materials, mainly there were obtained and disclosed some various outstanding physic-chemical characteristics of a large number of earth materials including the applications of material processing, nano-materials, composite materials and hard materials. In the existing research there were expected to characterize some selected clay varieties, a dolomite variety and a feldspar variety which are available in Sri Lanka towards the developments especially in some advanced chemical and catalytic applications. The X-ray fluorescence (XRF) spectroscopic analysis and Scanning electron microscopic (SEM) analysis were done for all of selected materials. The X-ray diffraction (XRD) analysis was done for three different selected clays and the Fourier transforms infrared (FT-IR) spectroscopic analysis was done for three different clay types and for a dolomite variety. According to the obtained results for the research, there were found the presence of at least 75% of Fe as the major element in each of clay with some other trace metallic elements such as K, Ti, Ca, Ba and Zr in such clays, kaolinite, montmorillonite and some of Fe minerals namely as muscovite and glauconite in such clays with quartz as a non-clayey mineral. There were found some higher amount of calcite in the selected dolomite with a trace amount of K and also there were found some higher K and Ca amounts presence in the selected feldspar rocks. When comparing the obtained results with past research out comes and modifications of materials, it seems that these materials will be much useful in the industrial applications such as the catalytic activities, waste water treatment applications in the removal of heavy metals d

关键词： Dolomite

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Molecular dynamics simulation study onπ-πstacking of Gemini surfactants in oil/water systems

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Chinese Journal of Chemical engineering 2022年第10期50卷 335-346页

作者： Jule Ma Peiwen Xiao Pingmei Wang Xue Han Jianhui Luo Ruifang Shi Xuan Wang Xianyu Song Shuangliang Zhao State Key Laboratory of Chemical Engineering and School of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Research Institute of Petroleum Exploration&Development(RIPED) PetroChinaBeijing 100083China Key Laboratory of Nano Chemistry(KLNC) CNPCBeijing 100083China Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir School of Environmental and Chemical EngineeringChongqing Three Gorges UniversityChongqing 404100China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology and School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China

Whereas theπ-πstacking interactions at oil/water interfaces can affect interfacial structures hence the interfacial properties,the underlying microscopic mechanism remains largely *** reported an all-atom molecular dynamics(MD)simulation study to demonstrate how the Gemini surfactants with pyrenyl groups affect the interracial properties,structural conformations,and the motion of molecules in the water/n-octane/surfactant ternary *** is found that the pyrenyl groups tend to be vertical to the interface owing to theπ-πstacking ***,a synergistic effect between theπ-πinteraction and steric hindrance is found,which jointly affects the coalescence of liquid ***,the existence of aromatic groups and a moderate number of surfactants helps to form *** work provides a molecular understanding of Gemini surfactants with aromatic groups in microemulsion preparation and applications.

关键词： Surfactants Interface Interfacial tension p-p stacking Microemulsion Molecular simulation

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Mathematical Modeling of Ozone Assisted Cerium Redox process for the Surface Removal of Stainless Steel Components Using a Static Mixer as Gas-Liquid Contactor

SSRN

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SSRN 2024年

作者： Singh, Sukhdeep Sen, Nirvik Patel, V.P. Banerjee, D. Karunakaran, Shaji Kumar, Sanjay Process Development Division Bhabha Atomic Research Centre Trombay Mumbai400085 India Homi Bhabha National Institute Anushaktinagar Mumbai400094 India Chemical Engineering Division Bhabha Atomic Research Centre Trombay Mumbai400085 India

This paper deals with a cerium based redox chemical process which is used for the surface removal and decontamination of stainless steel components arising from the operation and decommissioning of nuclear facilities. The process involves the corrosion of top metal surface (~ 10-50 µm) by highly oxidizing Ce(IV) ions to remove the entrapped radionuclides, while the reduced Ce(III) ions are continuously regenerated in-situ by ozone. In this work, a lumped parameter model, accounting for the reduction of Ce(IV) to Ce(III) by steel components and the simultaneous oxidation of Ce(III) to Ce(IV) by ozone in a static mixer, has been developed. The model is experimentally validated by carrying out a corrosion experiment at 5 L scale in ~ 0.4 M solution of Ce(IV) in 4 M HNO3 at room temperature, by using non-radioactive AISI SS304L stainless steel components of different geometries viz. plate, pipe, elbow and T-Joint with a total surface area of 348 cm2 . Using the validated model, design simulations of a pilot metal decontamination facility are carried out, to illustrate the effect of process parameters on the equilibrium Ce(IV) concentration in the loop, which is critical to component corrosion and decontamination. For a given initial cerium salt concentration, increasing gas flow rate, liquid flow rate, ozone concentration, initial nitric acid concentration and volume of solution have been found to favour a desired flat Ce(IV) concentration profile in the loop;while increasing temperature and area of components led to a decline in the equilibrium Ce(IV) concentration. Additionally, reducing acidity of nitric acid has been found to limit the treatment time of components. Furthermore, the choice of a Ce(III) or Ce(IV) salt, as a source of cerium ions, has been shown to have no effect on the corrosion of metal components in a long run, when ozone regeneration of Ce(IV) is employed. Among the components of various geometries, relatively higher corrosion rates have been obser

关键词： Stainless steel

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