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Discrete element simulation of crushable rockfill materials

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Water Science and Engineering 2013年第2期6卷 215-229页

作者： Lei SHAO Shi-chun CHI Liang-jing ZHOU Yu-zan WANG faculty of Infrastructure Engineering Dalian University of Technology Hydrochina Chengdu Engineering Corporation Changjiang Institute of Survey Planning Design and Research Changjiang Water Resources Commission

A discrete element method was used to study the evolution of particle crushing in a rockfill sample subjected to triaxial shear. A simple procedure was developed to generate clusters with arbitrary shapes, which resembled real rockfill particles. A theoretical method was developed to define the failure criterion for an individual particle subjected to an arbitrary set of contact forces. Then, a series of numerical tests of large-scale drained triaxial tests were conducted to simulate the behaviors of the rockfill sample. Finally, we examined the development of micro-characteristics such as particle crushing, contact characteristics, porosity, deformation, movement, and energy dissipation. The simulation results were partially compared with the laboratory experiments, and good agreement was achieved, demonstrating that the particle crushing model proposed can be used to simulate the drained triaxial test ofrockfill materials. Based on a comparison of macro behaviors of the roekfill sample and micro structures of the particles, the microscopic mechanism of the rockfill materials subjected to triaxial shear was determined qualitatively. It is shown that the crushing rate, rather than the number of crushed particles, can be used to reflect the relationship between macro- and micro-mechanical characteristics of rockfill materials. These research results further develop our understanding of the deformation mechanism of rockfill materials.

关键词： discrete element simulation triaxial shear test," roclcfill material geometric construction of particles particle flow code microscopic mechanism

Climate Change-Related Disaster Risk Events in Togo: A Systematic Review

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American Journal of Climate Change 2024年第1期13卷 1-13页

作者： Massama-Esso P. Assiah Gouvidé Jean Gbaguidi Mouhamed Idrissou Kossivi Hounake West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL) Department of Geography Faculty of Human and Social Sciences Université de Lomé Lomé Togo école Polytechnique de Lomé Université de Lomé Lomé Togo Faculté de Droit Université de Lomé Lomé Togo

Togo is facing significant climate challenges that have profound consequences for its environment, economy, and population. This study provides an overview of various climate phenomena affecting Togo and highlights potential adaptation strategies. We used the inclusion and exclusion criteria (PRISMA) to search both French and English articles on climate change-related disaster risk events in Togo through Google Scholar, Directory of Open Access Journals (DOAJ), and PubMed databases using the keywords “Climate Change”, “Floods”, “Drought”, “Coastal erosion”, “High winds”, “Epidemy”, Heatwaves”, and “Air pollution”. Twenty-five articles from 2000-2023 were included in this study after applying different criteria. Droughts, floods, coastal erosion, food and crop productivity loss, heatwaves, spread of vector-borne diseases, air pollution, and high winds are among the climate phenomena discussed. These challenges are driven by climate change, altering precipitation patterns, increasing temperatures, and rising sea levels. Drought, floods, coastal erosion, loss of food and crop productivity, spread of vector-borne diseases, air pollution and heatwaves are the most climate risks experienced by Togo. Drought contributes to decreased plant cover, water scarcity, and changes in the water and energy balance. Floods cause property damage, health risks, and disruptions to livelihoods. Coastal erosion threatens coastal communities, infrastructure, and ecosystems. Adaptation strategies include early warning systems, improved water management, sustainable agriculture, urban and health planning, and greenhouse gas emissions reduction. Drought-resistant crops, mosquito control, and clean energy adoption are essential.

关键词： Disaster Risks Impacts Climate Change Vulnerability Togo

Mechanisms of Dangua Fang(丹瓜方)in multi-target and multi-method regulation of glycolipid metabolism based on phosphoproteomics

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Journal of Traditional Chinese Medicine 2024年第2期44卷 334-344页

作者： HENG Xianpei WANG Zhita LI Liang YANG Liuqing HUANG Suping JIN Lang HE Weidong Department of Endocrinology People's Hospital Affiliated to Fujian University of Traditional Chinese MedicineFuzhou 350004China Academy of Integrative Medicine Fujian University of Traditional Chinese MedicineFuzhou 350122China faculty of Humanities and Management Fujian University of Traditional Chinese MedicineFuzhou 350122China Department of Geriatrics People's Hospital Affiliated to Fujian University of Traditional Chinese MedicineFuzhou 350004China

OBJECTIVE:To explore the mechanism of Dangua Fang(丹瓜方,DGR)in multi-target and multi-method regulation of glycolipid metabolism based on ***:Sprague-Dawley rats with normal glucose levels were randomly divided into three groups,including a conventional diet control group(Group A),high-fat-highsugar diet model group(Group B),and DGR group(Group C,high-fat-high-sugar diet containing 20.5 g DGR).After 10 weeks of intervention,the fasting blood glucose(FBG),2 h blood glucose[PBG;using the oral glucose tolerance test(OGTT)],hemoglobin A1c(HbA1c),plasma total cholesterol(TC),and triglycerides(TG)were tested,and the livers of rats were removed to calculate the liver ***,hepatic portal TG were tested using the Gross permanent optimization-participatiory action planning enzymatic method and phosphoproteomics was performed using liquid chromatography with tandem mass spectrometry(LC-MS/MS)analysis followed by database search and bioinformatics ***,cell experiments were used to verify the results of *** mitogen-activated protein kinase kinase kinase kinase 4(MAP4k4)and phosphorylated adducin 1(ADD1)were detected using western ***:DGR effectively reduced PBG,TG,and the liver index(P1.2),DGR upregulated the modification of 228 phosphorylation sites involving 204 corresponding function proteins,and downregulated the modification of 358 phosphorylation sites involving 358 corresponding function proteins,which includ

关键词： phosphoproteomics glycolipid metabolism therapeutic mechanism compound formula Dangua Fang

Modeling, simulation, and prediction of global energy indices: a differential approach

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Frontiers in Energy 2022年第2期16卷 375-392页

作者： Stephen Ndubuisi NNAMCHI Onyinyechi Adanma NNAMCHI Janice Desire BUSINGYE Maxwell Azubuike IJOMAH Philip Ikechi OBASI Department of Mechanical Engineering Kampala International University20000 KampalaUganda Department of Agricultural Engineering and Bio Resources Michael Okpara University of AgricultureUmudikeUmuahiaNigeria Directorate of Human Resource/Finance Kampala International University20000 KampalaUganda Department of Mathematics and Statistics Faculty of SciencesUniversity of Port HarcourtPMB 5323 Choba Port HarcourtNigeria Department of Macroeconomic Analysis(Ministry of Finance) Budget and National PlanningAbujaNigeria

Modeling, simulation, and prediction of global energy indices remain veritable tools for econometric, engineering, analysis, and prediction of energy indices. Thus, this paper differentially modeled, simulated, and non-differentially predicated the global energy indices. The state-of-the-art of the research includes normalization of energy indices, generation of differential rate terms, and regression of rate terms against energy indices to generate coefficients and unexplained terms. On imposition of initial conditions, the solution to the system of linear differential equations was realized in a Matlab environment. There was a strong agreement between the simulated and the field data. The exact solutions are ideal for interpolative prediction of historic data. Furthermore, the simulated data were upgraded for extrapolative prediction of energy indices by introducing an innovative model, which is the synergy of deflated and inflated prediction factors. The innovative model yielded a trendy prediction data for energy consumption, gross domestic product, carbon dioxide emission and human development index. However, the oil price was untrendy, which could be attributed to odd circumstances. Moreover, the sensitivity of the differential rate terms was instrumental in discovering the overwhelming effect of independent indices on the dependent index. Clearly, this paper has accomplished interpolative and extrapolative prediction of energy indices and equally recommends for further investigation of the untrendy nature of oil price.

关键词： energy indices differential model normalization simulation inflation deflation predictive factor and prediction rate

The layers of history: New architecture interventions in castle ruins

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Frontiers of Architectural Research 2021年第2期10卷 351-368页

作者： Iwona Wilczek Department of Architecture and Urban planning Faculty of Civil Ensineering and ArchitectureOpole University of TechnologyOpole45-061Poland

This paper aims to analyse new architectural works that were created within the ruins of castles and *** contribution addresses the question whether it is possible to indicate common features in these types of objects,by studying what changed and how it changed in the complexes of historic ruins by introducing a new layer:a new form in their *** analysis covers eight complexes of castle ruins located in Europe,all being important elements of local historical heritage,all preserved in their historical forms as permanent *** places are characterised by high imageability,which is conducive to maintaining interest,despite political or ideological *** need to introduce new functions,which is connected with this interest,raises questions related to preserving the identity and authenticity of the place,while at the same time building relationships with modern *** research concerned examples from Europe,mostly post-competition *** and analysis have shown that all the objects are characterised by well thought-out urban solutions and carefully selected locations of new buildings within the existing historic ruins,thereby helping maintain the structural order between the existing and the new spatial *** within the castle ruins were carried out using modern architectural language,using modern techniques and solutions,with great attention to *** are characterised by the abstraction of new forms and the creative reinterpretation of existing architectural elements and material solutions of the *** consciously applied contrast of forms and materials means that the historical heritage is being rediscovered,enriched with new,currently necessary *** all the described works,the introduction of new spatial experiences within existing objects constituted a significant *** examples analysed show that the experience and analysis of the broadly understood historical,urban and archite

关键词： Architectural heritage Place identity Visitor centre Cultural context Phenomenology

Land use change of Kitakyushu based on landscape ecology and Markov model

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Journal of Geographical Sciences 2008年第4期18卷 455-468页

作者： GUAN Dongjie GAO Weijun WATARI Kazuyuki FUKAHORI Hidetoshi Department of Environmental Space Design Faculty of Environmental Engineering The University of Kitakyushu Kitakyushu 8080135 Japan planning Section of Sewer and River Department in Kitakyushu Kitakyushu 8080135 Japan

Based on four phases of TM images acquired in 1990, 1995, 2000 and 2005, this paper took Kitakyushu in Japan as a case study to analyze spatial change of land use landscape and corresponding effects on environmental issues guided by landscape ecology theory in virtue of combining technology of Remote Sensing with GIS. Firstly, land use types were divided into 6 classes （farmland, mountain, forestland, water body, urban land and unused land） according to national classification standard of land use, comprehensible ability of TM image and purpose of this study. Secondly, following the theory of landscape ecology analysis, 11 typical landscape indices were abstracted to evaluate the environmental effects and spatial feature changes of land use. Research results indicated that land use has grown more and more diversified and unbalanced, human activities have disturbed the landscape more seriously. Finally, transfer matrix of Markov was applied to forecast change process of land use in the future different periods, and then potential land use changes were also simulated from 2010 to 2050. Results showed that conversion tendency for all types of land use in Kitakyushu into urban construction land were enhanced. The study was anticipated to help local authorities better understand and address a complex land use system, and develop improved land use management strategies that could better balance urban expansion and ecological conservation.

关键词： land use landscape ecology Markov model Kitakyushu in Japan

Spatial heterogeneity of the economic growth pattern and influencing factors in formerly destitute areas of China

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Journal of Geographical Sciences 2022年第5期32卷 829-852页

作者： YIN Jiangbin LI Shangqian ZHOU Liang JIANG Lei MA Wei Northwest Land and Resource Research Center Global Regional and Urban Research InstituteShaanxi Normal UniversityXi’an710119China School of Geography and planning Sun Yat-sen UniversityGuangzhou510275China faculty of Geomatics Lanzhou Jiaotong UniversityLanzhou730070China School of Economics Zhejiang University of Finance and EconomicsHangzhou310018China Business School Yangzhou UniversityYangzhouJiangsu225127China

Accelerating economic growth in formerly destitute areas and narrowing the economic gap with other regions are essential tasks for poverty alleviation in China after *** this study,the spatio-temporal characteristics of economic growth in 14 formerly destitute areas of China were ***,the spatial heterogeneity of various influencing factors was analyzed using a geographically weighted regression *** results were as follows:(1)The economic level of the formerly destitute areas was low,but their economies grew rapidly after 2011,with annual per capita GDP growth of 10.54%until 2018,higher than the national average of 9.14%.Western and southern counties grew faster economically than central and northern counties.(2)The impact of various factors on the economic growth of counties exhibited clear spatial *** influences of secondary industry growth and level of financial development on economic growth were mainly positive,whereas the effects of initial economic level and market location were mainly negative.(3)Six economic growth driving modes were identified for the 14 contiguous destitute areas,among which the secondary industry-driven mode was the most *** study can serve as a scientific reference for differentiating regional policies.

关键词： formerly destitute areas economic growth spatial variation geographically weighted regression China

Mathematical and statistical modeling of morphometric and planar parameters of barchans in Pashoeyeh Erg in the west of Lut Desert,Iran

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Journal of Arid Land 2021年第8期13卷 801-813页

作者： Hossein GHAZANFARPOUR Mohsen POURKHOSRAVANI Sayed H MOUSAVI Ali MEHRABI Department of Geography and Urban planning Shahid Bahonar University of KermanKerman ***Iran Department of Geography and Ecotourism Faculty of Natural Resources and GeosciencesUniversity of KashanKashan ***Iran

Barchan dunes are among the most common accumulative phenomena made by wind erosion,which are usually formed in regions where the prevailing wind direction is almost constant throughout the year and there is not enough sand to completely cover the land *** are among the most common windy landscapes in Pashoueyeh Erg in the west of Lut Desert,*** study aims to elaborate on morphological properties of barchans in this region using mathematical and statistical *** results of these methods are very important in investigating barchan shapes and identifying their *** shapes were mathematically modeled by simulating them in the coordinate system through nonlinear parabolic equations,so that two separate equations were calculated for barchan windward and slip-face *** type and intensity of relationships between barchan morphology and mathematical parameters were determined by the statistical *** results indicated that the existing relationships followed the power correlation with the maximum coefficient of determination and minimum error of *** the above two methods is a powerful basis for stimulating barchans in virtual and laboratory *** most important result of this study is to convert the mathematical and statistical models of barchan morphology to each *** length is one of the most important parameters of barchan parabolas,suggesting different states of barchans in comparison with each *** the barchan's focal length decreases,its opening becomes narrower,and the divergence of the barchan's horns *** with longer focal length have greater width,dimensions,and *** general,identifying and estimating the morphometric and planar parameters of barchans is effective in how they move,how much they move,and how they behave in the *** cases play an important role in the management of desert areas.

关键词： barchan dunes desert parabolic equations statistical model wind erosion Pashoueyeh Erg Lut Desert

UNet Based onMulti-Object Segmentation and Convolution Neural Network for Object Recognition

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Computers, Materials & Continua 2024年第7期80卷 1563-1580页

作者： Nouf Abdullah Almujally Bisma Riaz Chughtai Naif Al Mudawi Abdulwahab Alazeb Asaad Algarni Hamdan A.Alzahrani Jeongmin Park Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Department of Computer Science Air UniversityIslamabad44000Pakistan Department of Computer Science College of Computer Science and Information SystemNajran UniversityNajran55461Saudi Arabia Department of Computer Sciences Faculty of Computing and Information TechnologyNorthern Border UniversityRafha91911Saudi Arabia Information Technology Department College of Computing and InformaticsSaudi Electronic UniversityRiyadh13316Saudi Arabia Department of Computer Engineering Korea Polytechnic UniversitySiheung-siGyeonggi-do237Republic of Korea

The recent advancements in vision technology have had a significant impact on our ability to identify multiple objects and understand complex *** technologies,such as augmented reality-driven scene integration,robotic navigation,autonomous driving,and guided tour systems,heavily rely on this type of scene *** paper presents a novel segmentation approach based on the UNet network model,aimed at recognizing multiple objects within an *** methodology begins with the acquisition and preprocessing of the image,followed by segmentation using the fine-tuned UNet ***,we use an annotation tool to accurately label the segmented *** labeling,significant features are extracted from these segmented objects,encompassing KAZE(Accelerated Segmentation and Extraction)features,energy-based edge detection,frequency-based,and blob *** the classification stage,a convolution neural network(CNN)is *** comprehensive methodology demonstrates a robust framework for achieving accurate and efficient recognition of multiple objects in *** experimental results,which include complex object datasets like MSRC-v2 and PASCAL-VOC12,have been *** analyzing the experimental results,it was found that the PASCAL-VOC12 dataset achieved an accuracy rate of 95%,while the MSRC-v2 dataset achieved an accuracy of 89%.The evaluation performed on these diverse datasets highlights a notably impressive level of performance.

关键词： UNet segmentation blob fourier transform convolution neural network