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Journal articles on the topic 'Rocky DEM'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Zhu, Wei, Liang Gao, Yingai Zhao, Chao Yang, Wei Sun, and Pengqiang Yu. "Stability Analysis of Jointed Rock Cutting Slope Based on Discrete Element Method." Advances in Civil Engineering 2022 (July 16, 2022): 1–10. http://dx.doi.org/10.1155/2022/4915820.

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The joints in the rock mass are essential for the stability of rocky slopes, and the destabilization damage of the slope is often directly related to the joints. In this study, in order to reveal the instability process and mechanism of rock slopes from a microscale perspective, the DEM simulations for rocky slopes of the K88 + 400∼K88 + 540 section of Zhongkai Expressway are carried out considering the influence of joints. Based on the findings of the on-site jointed structural surfaces, a rocky slope model containing two sets of intermittent joints was constructed, and the linear parallel bo

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Xia, Tong, Xuancheng Ren, Yuntian Liu, Niutao Liu, Feng Xu, and Ya-Qiu Jin. "Detection of Surface Rocks and Small Craters in Permanently Shadowed Regions of the Lunar South Pole Based on YOLOv7 and Markov Random Field Algorithms in SAR Images." Remote Sensing 16, no. 11 (2024): 1834. http://dx.doi.org/10.3390/rs16111834.

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Excluding rough areas with surface rocks and craters is critical for the safety of landing missions, such as China’s Chang’e-7 mission, in the permanently shadowed region (PSR) of the lunar south pole. Binned digital elevation model (DEM) data can describe the undulating surface, but the DEM data can hardly detect surface rocks because of median-averaging. High-resolution images from a synthetic aperture radar (SAR) can be used to map discrete rocks and small craters according to their strong backscattering. This study utilizes the You Only Look Once version 7 (YOLOv7) tool to detect varying-s

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Eduard R., Khasanov, Mirzamatov Radmir R., Faizullin Rinat T., and Yakubov Andrey M. "COMPUTER MODEL OF THE TECHNOLOGICAL PROCESS OF A DEVICE FOR PROCESSING SEEDS WITH CHEMICAL AND BIOLOGICAL PREPARATIONS BASED ON A COMBINATION OF DISCRETE ELEMENT METHODS AND TWO-PHASE “GAS – PARTICLE” FLOWS." Vestnik Bashkir State Agrarian University 74, no. 2 (2025): 124–32. https://doi.org/10.31563/1684-7628-2025-74-2-124-132.

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The article presents the results of numerical modeling of the alfalfa seed treatment process with biological products using the coupled DEM-CFD approach in the Rocky DEM and ANSYS Fluent software packages. The simulation allowed us to evaluate the interaction of the liquid phase (biopreparation) with solid particles (seeds) in an experimental scarifier. The hydrodynamic parameters of the system were investigated, including the flow rate of the biological product, the trajectories of seed movement and their distribution in the treatment area. The results showed that the Rocky DEM and ANSYS Flue

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Shevchuk, Ruslan, Volodymyr Filipovych, Anton Mychak, and Mykola Lybskyi. "Satellite monitoring features of crystalline rocks mining territories within Zhitomyr region based on optical and radar remote sensing data." Ukrainian journal of remote sensing, no. 22 (October 1, 2019): 12–21. http://dx.doi.org/10.36023/ujrs.2019.22.157.

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Opportunities of optical and radar satellite data application for ecological state and reclamation quality assessment of disturbed by crystalline rocks open cast mining lands are considered in the article. Digital elevation models analysis is proposed for the problem of identification of mines among rock dumps and rocky outcrops solution. Radar interferograms were used as source data for DEM creating. The research was performed on three study sites within Korostishiv, Cherniahiv and Khoroshiv districts of Zhitomir region. As result of the study an abandoned quarry with no reclamation done and

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Neuleitner, Dana. "Rocky Beach im Piratenfieber." merz | medien + erziehung 65, no. 2 (2021): 82–83. http://dx.doi.org/10.21240/merz/2021.2.21.

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USM (2020). Die drei ??? – Fluch des Flaschenteufels. Android/iOS 7,99 € bzw. Windows/Mac 19,99 €; USK ab 0 Jahren bzw. ab 6 Jahren. Seit über 50 Jahren begleiten Die Drei ??? schon junge Leser*innen und Hörer*innen. Seit letztem Jahr können Rätselfans gemeinsam mit den Detektiven den neuen Fall ‚Fluch des Flaschenteufels‘ als App oder Computerspiel lösen. Schauplatz ist – wie sollte es anders sein – Rocky Beach. Als ein seltsamer Übernachtungsgast im Hause Jonas sein Unwesen treibt und Beschwörungen mit einer alten Flasche durchführt, ist für den ersten Detektiv Justus Jonas klar: dem muss au

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Costa, Felipe de A., Gabriel K. P. Barrios, Alan P. Fidalgo, Alan A. Arruda Tino, and Luís Marcelo Tavares. "Modeling Shapes of Coarse Particles for DEM Simulations Using Polyhedral Meta-Particles." Minerals 15, no. 2 (2025): 103. https://doi.org/10.3390/min15020103.

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Particles of selected materials, namely granulite quarry rock and itabirite iron ore, have been characterized regarding their shapes using reconstruction from 2D images and 3D laser scanning. Different levels of simplifications of particle geometry were initially proposed, with optimal fit-for-purpose shapes represented by polyhedral meta-particles containing 41 to 90 faces. From the distribution of aspect ratios, a total of 16 groups of shapes have been created. Preliminary validation of the shapes modeled was carried out by comparing bulk density measurements from simulations and experiments

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Liu, J., G. Q. Zhou, B. Jia, T. Yue, and X. Y. Peng. "KARST ROCKY DESERTIFICATION ANALYSIS BASED ON HISTORICAL DISP DATA TAKE TWO REGIONS FOR EXAMPLE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W10 (February 8, 2020): 871–74. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w10-871-2020.

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Abstract. Karst rocky desertification (KRD) is used to characterize the processes that transform a karst area covered by vegetation and soil into a rocky landscape almost devoid of soil and vegetation. This situation seriously affects and threatens the living environment and standards of local people, which results in a series of social problems. In view of the importance and harmfulness of KRD, many scholars have studied the spatial and temporal evolution of KRD and its driving forces. In this paper, the Visual Interpretation Marks of Rocky Desertification in Southwest China in 1960s are cons

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8

Laptev, V. V. "Numerical modelling of fragmented mined rock flow during ore drawing using the ROCKY DEM programme." Vestnik MGTU 22, no. 1 (2019): 149–57. http://dx.doi.org/10.21443/1560-9278-2019-22-1-149-157.

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9

Lvov, Vladislav, and Leonid Chitalov. "Semi-Autogenous Wet Grinding Modeling with CFD-DEM." Minerals 11, no. 5 (2021): 485. http://dx.doi.org/10.3390/min11050485.

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The paper highlights the features of constructing a model of a wet semi-autogenous grinding mill based on the discrete element method and computational fluid dynamics. The model was built using Rocky DEM (v. 4.4.2, ESSS, Brazil) and Ansys Fluent (v. 2020 R2, Ansys, Inc., United States) software. A list of assumptions and boundary conditions necessary for modeling the process of wet semi-autogenous grinding by the finite element method is presented. The created model makes it possible to determine the energy-coarseness ratios of the semi-autogenous grinding (SAG) process under given conditions.

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В.И., КЛИШИН, СТАРОДУБОВ А.Н., КРАМАРЕНКО В.А., КАДОЧИГОВА А.Н. та КАПЛУН А.В. "ИССЛЕДОВАНИЕ ПАРАМЕТРОВ ВЫПУСКА УГЛЯ ИЗ ПОДКРОВЕЛЬНОЙ ТОЛЩИ СРЕДСТВАМИ ИМИТАЦИОННОГО МОДЕЛИРОВАНИЯ". Физико-технические проблемы разработки полезных ископаемых, № 4 (14 вересня 2023): 44–51. http://dx.doi.org/10.15372/ftprpi20230405.

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Рассмотрена новая конструкция механизированной крепи для разработки мощных угольных пластов с выпуском подкровельной толщи угля, предусматривающая его контролируемый выпуск с помощью специального выпускного окна и питателя, совершающего возвратно-поступательное движение. Внедрение подобной технологии нуждается в предварительном тестировании, изучении режимных параметров выпуска секций, при которых обеспечивается максимально допустимое заполнение лавного конвейера без перегрузки и динамических явлений. Для изучения технологии создана имитационная модель в среде Rocky DEM, учитывающая физический

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Yao, M., G. Zhou, W. Wang, Z. Wu, Y. Huang, and X. Huang. "STUDY ON KARST INFORMATION IDENTIFICATION OF QIANDONGNAN PREFECTURE BASED ON RS AND GIS TECHNOLOGY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 2121–25. http://dx.doi.org/10.5194/isprs-archives-xlii-3-2121-2018.

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Karst area is a pure natural resource base, at the same time, due to the special geological environment; there are droughts and floods alternating with frequent karst collapse, rocky desertification and other resource and environment problems, which seriously restrict the sustainable economic and social development in karst areas. Therefore, this paper identifies and studies the karst, and clarifies the distribution of karst. Provide basic data for the rational development of resources in the karst region and the governance of desertification. Due to the uniqueness of the karst landscape, it c

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Lee, Hoseung, Jihyun Moon, and Hoonyol Lee. "Activity of Okgye Limestone Mine in South Korea Observed by InSAR Coherence and PSInSAR Techniques." Remote Sensing 14, no. 24 (2022): 6261. http://dx.doi.org/10.3390/rs14246261.

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The Okgye limestone mine, which is the largest open-pit limestone mine located in a mountainous area in Korea, suffered a collapse in 2012 that claimed four casualties. Restoration work on the rocky mined-out slopes, as well as mining and dumping activities, are still in progress. Monitoring slope stability is important to prevent the sudden collapse of slopes, which can be efficiently performed by satellite-based interferometric synthetic aperture radar (InSAR) techniques. Firstly, we obtained elevation changes using InSAR-generated Copernicus 30 m DEM in 2014 and an SRTM 1Sec DEM in 2000, th

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13

Piacentini, Daniela, Francesco Troiani, Davide Torre, and Marco Menichetti. "Land-Surface Quantitative Analysis to Investigate the Spatial Distribution of Gravitational Landforms along Rocky Coasts." Remote Sensing 13, no. 24 (2021): 5012. http://dx.doi.org/10.3390/rs13245012.

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The increasing availability of high-quality digital elevation models (DEMs) has been associated with a growing interest in developing quantitative analyses aimed at taking advantage of these detailed, updated, and promising digital datasets. Land-surface quantitative (LSQ) analysis is valuable for describing the land-surface topography and performing measures of the signature of specific geomorphic processes, taking into account site-specific geological contexts and morphoclimatic settings, proving to be particularly effective in transitional environments, such as rocky coasts. This paper pres

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Chakraborty, M., S. Panigrahy, and S. Kundu. "Semi-automated Technique to Extract Boundary of Valley/mountain Glaciers using Glacio-morphological Information from Digital Elevation Model." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-8 (November 28, 2014): 511–16. http://dx.doi.org/10.5194/isprsarchives-xl-8-511-2014.

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A semi automated technique has been developed to extract the spatial extension of valleys and mountain glaciers. The method is based on morphological properties of glaciated area extracted from Digital Elevation Model (DEM). Identification of glacial boundary based on spectral information from optical remote sensing imageries produces errors due to misclassification of debris-covered ablation area with surrounding rocky terrain and perennially snow-covered slope with debris free glaciated area. Elevation information DEM of Shuttle Radar Topography Mission (SRTM), CartoDEM and ASTER DEM have be

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15

S.G., Mudarisov, Farkhutdinov I.M., and Gareev I.F. "MODELLING THE INTERACTION OF ANCHOR OPENER WITH SOIL AND SEEDS BY THE METHOD OF DISCRETE ELEMENTS: ANALYSIS OF TRACTION RESISTANCE AND AGROTECHNICAL PARAMETERS." Russian Electronic Scientific Journal 55, no. 1 (2025): 287–95. https://doi.org/10.31563/2308-9644-2025-55-1-287-295.

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The article studies the interaction of an anchor coulter with soil, seeds and fertilizers using the discrete element method (DEM) in the Rocky Dem program. The Hertz-Mindlin and Johnson-Kendall-Roberts (JKR) contact models are used to describe the normal and tangential interaction of particles, as well as the linear springviscous model for simulating the movement of seeds and fertilizers. Model and fullscale experiments are conducted to assess the traction resistance of the coulter depending on the speed of movement and the width of the chisel. The results showed that the traction resistance i

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16

Khasanov, Eduard R., Radmir R. Mirzamatov, Airat M. Mukhamedinov, and Andrei M. Yakupov. "STUDY OF THE MECHANICAL IMPACT ON ALFALFA SEEDS IN THE SEEDER TUBE OF A SEEDER ON THE BASIS OF A DIGITAL TWIN." VESTNIK OF THE BASHKIR STATE AGRARIAN UNIVERSITY 67, no. 3 (2023): 141–46. http://dx.doi.org/10.31563/1684-7628-2023-67-3-141-146.

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The article investigates the mechanical impact on alfalfa seeds during their movement in the seed tube of the seeder; for this purpose, a digital twin has been developed that will allow you to determine the speed, force and mechanical stress exerted on the seeds. The developed mathematical model will allow you to select the optimal parameters, determine the disadvantages and advantages of the device, which in turn will allow in the future to use the full potential of the device to improve pre-sowing seed treatment and thereby increase seed germination, providing farm animals with high-quality

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17

Alemayehu, Daniel, Meseret Tadesse, and Mohammed Abdul Athick. "Application of TPI for Analysis of Landforms and LULC of Adama Wereda, Ethiopia." Journal of Geographical Studies 2, no. 2 (2019): 100–109. http://dx.doi.org/10.21523/10.21523/gcj5.18020205.

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Topographic Position Index (TPI) algorithm is useful for landform classification using Digital Elevation Model (DEM) to identify upper, middle and lower parts of the landscape. Topographic slope positions and landform classifications can be automated and measured by employing the Jenness algorithm based on the Set of Rules in the TPI. Adama Wereda in Ethiopia has been selected to study the different landforms classified using DEM (30m resolution) and Landsat 8 OLI data. Spatial statistics and GIS applications were also used to distinguish the geomorphologic properties of DEM. Adama Wereda enco

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Tri Sutrisno, Pendi, Sigit Heru Murti, and Eko Haryono. "Sidik Cepat Potensi Karst Rocky Desertification (KRD) Menggunakan Citra Landsat 8 OLI: Studi di Kawasan Karst Gunungsewu Bagian Barat." Majalah Geografi Indonesia 34, no. 2 (2020): 150. http://dx.doi.org/10.22146/mgi.43013.

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Abstrak. Proses identifikasi kondisi lingkungan dapat dilakukan melalui adanya sidik cepat pemetaan Karst Rocky Desertification (KRD), termasuk di kawasan karst Gunungsewu bagian barat. Tujuan dari kajian ini adalah untuk mengetahui secara cepat potensi intensitas proses KRD yang terjadi di wilayah kajian, menggunakan metode analisis data citra penginderaan jauh multispektral. Metode yang digunakan adalah pengolahan citra secara digital menjadi citra indeks NDVI dan BI ditunjang dengan menggunakan analisis Digital Elevation Model (DEM) untuk menghasilkan data kemiringan lereng. Kriteria kelas

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Imaichi, Kenta, Lawrence K. Nordell, Brandt Porter, and Alexander Potapov. "Development and Performance Variation of Energy Saving Type Comminution Machine Using General Purpose DEM Simulation Soft “ROCKY”." Journal of the Society of Powder Technology, Japan 54, no. 10 (2017): 666–72. http://dx.doi.org/10.4164/sptj.54.666.

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20

Xu, Jun, Fei Wang, and Bryce Vaughan. "CFD–DEM Analysis of Internal Soil Erosion Induced by Infiltration into Defective Buried Pipes." Geosciences 15, no. 7 (2025): 253. https://doi.org/10.3390/geosciences15070253.

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Internal soil erosion caused by water infiltration around defective buried pipes poses a significant threat to the long-term stability of underground infrastructures such as pipelines and highway culverts. This study employs a coupled computational fluid dynamics–discrete element method (CFD–DEM) framework to simulate the detachment, transport, and redistribution of soil particles under varying infiltration pressures and pipe defect geometries. Using ANSYS Fluent (CFD) and Rocky (DEM), the simulation resolves both the fluid flow field and granular particle dynamics, capturing erosion cavity fo

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Kasai, Mio, Manabu Ikeda, Toshihiro Asahina, and Kazunori Fujisawa. "LiDAR-derived DEM evaluation of deep-seated landslides in a steep and rocky region of Japan." Geomorphology 113, no. 1-2 (2009): 57–69. http://dx.doi.org/10.1016/j.geomorph.2009.06.004.

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22

Han, Lei, Zheyuan Miao, Zhao Liu, et al. "An Improved Soil Moisture Downscaling Method Based on Soil Properties and Geographical Divisions over the Loess Plateau." Land 14, no. 2 (2025): 410. https://doi.org/10.3390/land14020410.

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As the contradiction between vegetation growth and soil moisture (SM) demand in arid zones gradually expands, accurately obtaining SM data is crucial for ecological construction. Remote sensing products limit small-scale studies due to the low resolution, and the emergence of downscaling solves this problem. This study proposes an improved semi-physical SM downscaling method. The effects of environmental factors on SM in different geographical zones (Windy Sand Hills, Flood Plains, Loess Yuan, Hilly Loess, Earth-rock Hills and Rocky Mountain) were analyzed using Random Forests. Vegetation and

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Wang, Longbao, Hanyu Yang, Zhinan Wang, et al. "Calibration of DEM Polyhedron Model for Wheat Seed Based on Angle of Repose Test and Semi-Resolved CFD-DEM Coupling Simulation." Agriculture 15, no. 5 (2025): 506. https://doi.org/10.3390/agriculture15050506.

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The shape of particles is a critical determinant that significantly influences the accuracy of discrete element simulations. To reduce the discrepancies between the discrete element model of wheat seeds and the actual particle shapes, and to enhance the accuracy of Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) coupling simulations in gas–solid two-phase flow studies, We employed laser scanning and inverse modeling techniques to develop a three-dimensional (3D) reconstruction of the wheat seed. Subsequently, we employed Rocky DEM simulation software to develop a polyhedron mode

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Zhang, Chao, Ye Zhang, Yifan Liu, and Xing Guo. "Numerical Simulation and Parameter Optimization of Air Slide Based on CFD-DEM." Applied Sciences 15, no. 9 (2025): 5205. https://doi.org/10.3390/app15095205.

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The aim of this study was to investigate the influence of operational and design parameters on the conveying efficiency and material layer stability of air slides and to optimize the parameters of the XZ200 air slide. A gas–solid coupled simulation of the conveying process was conducted using ANSYS v2023 and Rocky v23R1 software. Three key variables—inclination angle, input air velocity, and permeable layer porosity—were analyzed to evaluate their effects on wheat flour conveying efficiency and layer stability. Orthogonal experiments and matrix analysis were applied to comprehensively assess t

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Yin, Zixin, Daoming Ma, and Tongqing Li. "Effect of Grinding Media Grading on Liner Wear and Load Behavior in a Ball Mill by Using Rocky DEM." Lubricants 12, no. 10 (2024): 340. http://dx.doi.org/10.3390/lubricants12100340.

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The liner is a wear-prone component in ball mills, subject to continuous impacts, squeezing, and abrasion from the grinding media during operation. Its service performance directly affects the working efficiency of the ball mill. The service life of mining ball mill liners is about 8 months, and frequent downtimes occur due to liner wear and loss of effectiveness, with liner replacement accounting for about 6% of the total cost, resulting in huge economic losses. This paper focuses on a Φ305 mm × 150 mm experimental ball mill, using the discrete element software Rocky Discrete Element Method (

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Dubinkin, D. M., and A. V. Yalyshev. "Determination of static loads on the body sides of a mining dump truck." Mining Industry Journal (Gornay Promishlennost), no. 6/2022 (January 15, 2023): 137–44. http://dx.doi.org/10.30686/1609-9192-2022-6-137-144.

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The article considers design schemes for determining static loads on the body sides of a mining dump truck. Methods for determining the static loads are described. Calculations of the pressure on the retaining wall using an analytical method were carried out. Simulation modeling of the body side loading with the method of discrete elements using the Rocky DEM software was performed. The parameters for discrete elements (with coal as the bulk material) are given. The calculated values and the previously obtained values of physical tests and studies are analyzed. Graphs and dependences of the in

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Yang, Meng, Christian Hirt, Moritz Rexer, Roland Pail, and Dai Yamazaki. "The tree-canopy effect in gravity forward modelling." Geophysical Journal International 219, no. 1 (2019): 271–89. http://dx.doi.org/10.1093/gji/ggz264.

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SUMMARY High resolution and accurate digital terrain models (DTMs) are frequently used as input data sets to define the topographic masses in gravity forward modelling, for example, for terrain corrections in the context of regional gravity modelling. However, over vegetated areas such as forests and scrublands, the radar- and image-based digital elevation models (DEMs) may contain a tree bias, and therefore do not represent the bare-ground surface. The presence of vegetation-induced signals in DEMs, denoted here the tree-canopy effect, will introduce errors in the gravity forward modelling. I

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Troiani, Francesco, Salvatore Martino, Gian Marco Marmoni, et al. "Integrated Field Surveying and Land Surface Quantitative Analysis to Assess Landslide Proneness in the Conero Promontory Rocky Coast (Italy)." Applied Sciences 10, no. 14 (2020): 4793. http://dx.doi.org/10.3390/app10144793.

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Rock slopes involved in extensive landslide processes are often characterized by complex morphodynamics acting at different scales of space and time, responsible for different evolutionary scenarios. Mass Rock Creep (MRC) is a critical process for long-term geomorphological evolution of slopes and can likewise characterize actively retreating coastal cliffs where, in addition, landslides of different typologies and size superimpose in space and time to marine processes. The rocky coast at the Conero promontory (central Adriatic Sea, Italy) offers a rare opportunity for better understanding the

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Kovanič, Ľudovít, Peter Blistan, Rudolf Urban, et al. "Analysis of the Suitability of High-Resolution DEM Obtained Using ALS and UAS (SfM) for the Identification of Changes and Monitoring the Development of Selected Geohazards in the Alpine Environment—A Case Study in High Tatras, Slovakia." Remote Sensing 12, no. 23 (2020): 3901. http://dx.doi.org/10.3390/rs12233901.

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The current trend in the use of remote sensing technologies is their use as a tool for monitoring hard-to-reach areas, objects or phenomena in the alpine environment. Remote sensing technology is also effectively used to monitor geohazards and the development of human-made changes in the country. Research presented in this study demonstrates the results for the usability of the publicly available national digital elevation model DEM 5.0 obtained by utilizing the airborne laser scanning (ALS) survey to monitor the development of erosion, morphological changes of talus cones, or the dynamics of

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Li, Hongcheng, Rong Zeng, Zhiyou Niu, and Junqi Zhang. "A Calibration Method for Contact Parameters of Maize Kernels Based on the Discrete Element Method." Agriculture 12, no. 5 (2022): 664. http://dx.doi.org/10.3390/agriculture12050664.

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Clarifying the maize kernel movement during the crushing process is critical for improving the design and optimization of the impact mill. Rather than through experiments, maize kernel movement can be quantitatively analyzed through the discrete element method (DEM), and this could contribute more to the study of the crushing mechanism and equipment optimization. However, having an accurate particle model and contact parameters are prerequisites to ensure the accuracy of the DEM simulation. In this study, we proposed a maize kernel model construction method for the Rocky DEM simulation and a c

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Opalev, A. S., and A. A. Palivoda. "Modeling of the liquid-solid particle systemin the coupling solution of the task in rocky dem and ansys fluent." Mining informational and analytical bulletin, no. 12-1 (2022): 78–93. http://dx.doi.org/10.25018/0236_1493_2022_121_0_78.

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Khasanov, Eduard R., Radmir R. Mirzamatov, Damir I. Maskulov, and Radik Z. Musin. "CALIBRATION OF THE PROCESS OF ALFALFA SEEDS MOVEMENT IN THE ROCKY DEM SOFTWARE COMPLEX BY THE DISCRETE ELEMENT METHOD." Vestnik Bashkir State Agrarian University, no. 4 (2022): 136–43. http://dx.doi.org/10.31563/1684-7628-2022-64-4-136-143.

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McCleary, Richard J., and Marwan A. Hassan. "Predictive modeling and spatial mapping of fish distributions in small streams of the Canadian Rocky Mountain foothills." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 2 (2008): 319–33. http://dx.doi.org/10.1139/f07-161.

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We developed an automated procedure for modeling spatial distribution of fish occurrence using logistic regression models and geographic information system (GIS) tools. Predictors were measured from a digital elevation model (DEM) and stream layers. We evaluated the accuracy of GIS measures of reach slope through a comparison with field measures. Resource selection function models were used to explain presence-absence of bull trout (Salvelinus confluentus), rainbow trout, (Oncorhynchus mykiss), nonnative brook trout (Salvelinus fontinalis), and all fishes. Our models were extrapolated based on

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Mudarisov, Salavat G., Ildar M. Farkhutdinov, and Rustam Yu Bagautdinov. "Justification of Dual-Level Opener Parameters in Digital Twin by the Discrete Element Method." Engineering Technologies and Systems 34, no. 2 (2024): 229–43. http://dx.doi.org/10.15507/2658-4123.034.202402.229-243.

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Introduction. The discrete element method is the most promising method for modeling soil tillage. With the use of DEM modeling it is possible to create a digital twin for technological process of interaction of tools with soil, analyze the operation of tillage and seeding machines having various design and technological parameters, and predict energy and agrotechnical indicators of еtheir work. To improve the prediction accuracy, it is necessary to compare the obtained data with the results of field experiments. Aim of the Study. The study is aimed at developing a digital twin of the tillage b

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Starodubov, A. N., V. I. Klishin, A. N. Kadochigova, and A. V. Kaplun. "Research of coal mining technology in complex ground conditions using mathematical modeling." Mining Industry Journal (Gornay Promishlennost), no. 5S/2023 (December 20, 2023): 47–52. http://dx.doi.org/10.30686/1609-9192-2023-5s-47-52.

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Future development of mining operations along with creation of new mines, will be supported by modernization and reconstruction of existing enterprises. Creation of mechanized coal face systems that ensure complete extraction of coal reserves with the supply of occupational safety is prospective. One of the most effective technologies for the development of high coals is their mining from wall to wall with drawing coal from the roof layer into the under-cutting layer. Research of a new design of mechanized support was carried out using the developed simulation model based on the discrete eleme

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Liu, Xianshan, and Ming Xu. "The Unsaturated Hydromechanical Coupling Model of Rock Slope Considering Rainfall Infiltration Using DDA." Geofluids 2017 (2017): 1–15. http://dx.doi.org/10.1155/2017/1513421.

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Water flow and hydromechanical coupling process in fractured rocks is more different from that in general porous media because of heterogeneous spatial fractures and possible fracture-dominated flow; a saturated-unsaturated hydromechanical coupling model using a discontinuous deformation analysis (DDA) similar to FEM and DEM was employed to analyze water movement in saturated-unsaturated deformed rocks, in which the Van-Genuchten model differently treated the rock and fractures permeable properties to describe the constitutive relationships. The calibrating results for the dam foundation indic

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Shibaeva, Darya, Sergey Tereshchenko, Danila Asanovich, and Pavel Shumilov. "On the need to classify rock mass fed to dry magnetic separation." Записки Горного института 256 (November 10, 2022): 603–12. http://dx.doi.org/10.31897/pmi.2022.79.

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The hypothesis of a possible use of dry magnetic separation is substantiated on the example of ores from ferruginous quartzite deposits operated by plants of PAO “Severstal” Holding. Size class of ore after medium crushing is –80+0 mm when the vibrating feeder is used for feeding ore mass to the separation zone. The rationale is based on the analysis of video recording of physical simulation on a laboratory drum magnetic separator of SMBS-L series, in the VSDC Video Editor, and simulation modelling of dry magnetic separation on its virtual prototype in Rocky DEM software package. It has been p

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Khasanov, Eduard, Radmir Mirzamatov, Andrey Yakupov, and Marsel Yamaletdinov. "DEVELOPMENT AND JUSTIFICATION OF A SCARIFIER WITH A CONE DISC FOR BEAN SEEDS." Vestnik of Kazan State Agrarian University 18, no. 3 (2023): 102–10. http://dx.doi.org/10.12737/2073-0462-2023-102-110.

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Currently, in the context of Western sanctions, the main goal of the agriculture of the Russian Federation is food security and reducing import dependence. The modernization of agricultural machinery, as well as the search for new ways of pre-sowing seed treatment, will increase the germination of seeds and provide agricultural livestock with high-quality fodder legumes. The paper considers an experimental scarifier of legume seeds, which makes it possible to scarify the seeds of legumes, thereby increasing their germination. The article describes the theoretical basis for the movement of seed

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Li, Yanan, Raihan Jamil, and Jeffrey VanLooy. "Accelerated Glacier Thinning and Area Loss in the Wind River Range, Wyoming (1968–2019): Climate and Topographic Drivers." Remote Sensing 17, no. 5 (2025): 916. https://doi.org/10.3390/rs17050916.

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Glacier meltwater influences streamflow and various activities in the western US. The Wind River Range (WRR) in Wyoming, which contains the largest glacial mass in the Rocky Mountains of the conterminous US, has been retreating since the Little Ice Age. This study examines long-term changes in WRR glaciers (>0.2 km2) over 1968–2019 and investigates their relationship with climatic and topographic factors. Using USGS topographic maps, satellite imagery, DEM datasets, and GPS surveys, we analyzed glacier area and surface elevation changes. Our results show a 19.2 ± 0.9% glacier area reduction

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Ren, Dezhi, Luji Zhang, Huiting Cheng, Jun Meng, and Tianyi He. "Calibration of Contact Parameters of Biochar Based on Discrete Element Method." Journal of the ASABE 67, no. 1 (2024): 59–68. http://dx.doi.org/10.13031/ja.15597.

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Highlights The rice husk and straw biochar particles were statistically analyzed, and two representative particles were obtained. A particle model was established using the discrete element method and the Johnson-Kendall-Roberts method. This study used a response surface design method to calibrate biochar particle parameters. Abstract. The discrete element method (DEM) is widely used in modelling particulate materials and related applications. DEM modelling requires the calibration of a large number of microparameters that are difficult to experimentally measure. This study aims to obtain the

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Mephors, J. O., C. O. Ogunmuyiwa, O. S. Afolabi, C. F. Agbor, O. M. Ogoliegbune, and C. S. Ofordu. "Use of Digital Elevation Models to Map Out The Groundwater Resources Base Of Kuje Area to Federal Capital Territory, Abuja, Nigeria." Journal of Applied Sciences and Environmental Management 25, no. 7 (2021): 1207–12. http://dx.doi.org/10.4314/jasem.v25i7.16.

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   This research work examined the use of digital elevation model in the evaluation of groundwater resources in Kuje Area, Nigeria. This was achieved through the acquisition of topographic maps, Digitization of the topographic maps which were glued and interpolated to generate Digital Elevation Models (DEM) and Mapping of groundwater potential areas using ArcGIS 9.2 and ArcView 3.2a software. Findings from this research show that the study area have elevations ranging from 333 m to 429 m above sea level with a moderate groundwater potential in areas with elevation ranging fro

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Starodubov, A. N., A. N. Kadochigova, and A. V. Kaplun. "Application of the discrete element method for simulation of coal mining by a cutter-loader in a working face." Mining Industry Journal (Gornay Promishlennost), S2/2023 (November 10, 2023): 150–54. http://dx.doi.org/10.30686/1609-9192-2023-s2-150-154.

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Timulation modeling as a method of studying complex technological processes is successfully used in mining. Due to the creation of digital models, it is possible to estimate and improve the efficiency of technical and organizational solutions used in difficult mining and geological conditions. The article describes the development of a simulation model of coal extraction by a shearer and its transportation to an armored conveyer. Fragmentation of a high coal seam was simulated under the action of the cutting planes of the shearer. The created model in the Rocky DEM simulation environment takes

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Rehbein, Sonja. "Das vierte Fragezeichen." merz | medien + erziehung 55, no. 2 (2011): 80–81. http://dx.doi.org/10.21240/merz/2011.2.20.

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Die drei ??? – Das Quiz, United Soft Media Verlag GmbH, PC CD-ROM, 11,97 €. „Packende Quiz-Spannung bei Rätseln und Aufgaben rund um die Welt der drei Kultdetektive“, das verspricht das PC-Quiz allen Fans der Drei ??? . Die Spielenden bewerben sich als Assistenz-Detektive in Rocky Beach und müssen beweisen, dass sie der Zusammenarbeit mit den Drei ??? würdig sind. Erst dann dürfen sie den Drei ???und Inspektor Cotta bei der Jagd auf Victor Hugenay, den berühmt berüchtigten Kunstdieb und Dauerkontrahenten der Drei ???, helfen. Um sich als gewiefter Detektiv auszuweisen, müssen vier ‚Meisterfrag

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Calista, Monia, Francesco Mascioli, Valeria Menna, Enrico Miccadei, and Tommaso Piacentini. "Recent Geomorphological Evolution and 3D Numerical Modelling of Soft Clastic Rock Cliffs in the Mid-Western Adriatic Sea (Abruzzo, Italy)." Geosciences 9, no. 7 (2019): 309. http://dx.doi.org/10.3390/geosciences9070309.

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Geomorphological evolution, erosion and retreat processes that affect the rocky coasts of the mid-western Adriatic Sea (Abruzzo, Central Italy) are the subject of this research. This coastal sector, one of the few examples of clastic soft rock coasts in the Mediterranean Sea, is characterized by active, inactive and paleo cliffs, as well as coastal slopes, composed of the clayey-sandy-arenaceous-conglomeratic marine sequence (Early-Middle Pleistocene) covered by continental deposits (Late Pleistocene-Holocene). This study provides geomorphological and 3D modelling stability analyses of the cli

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Yu, Tian Tang, and Sheng Xu Xia. "DEM for Modeling Cracks Propagation in Rocks under Uniaxial Compression Tests." Advanced Materials Research 433-440 (January 2012): 4788–93. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.4788.

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The Discrete Element Method (DEM) was used to simulate cracks propagate in rocks subjected to uniaxial compressive stress. A DEM code was developed, and used to simulate the response of the continuum materials to loading. Rock samples with two initial cracks inclined at varying angles were simulated with the DEM code. The results were compared with those obtained from laboratory samples, and it was observed that the two results were consistent. This suggests that the DEM is a robust technique for the visualization of secondary cracks formations and propagations in rocks.

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Adhikary, Deepak P., Marc Elmouttie, Vincent Lemiale, and Brett Poulsen. "Recent advances in the stability assessment of natural and engineered rock slopes." Journal of Nepal Geological Society 50, no. 1 (2016): 65–72. http://dx.doi.org/10.3126/jngs.v50i1.22866.

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Science’s understanding of the failure mechanisms of large natural and engineered slopes has been improved considerably over the past 15 years. Significant improvements have been realized in innovative methods of data acquisition through field measurement and monitoring, as well as numerical modelling techniques. However, inadequate understanding of complex geology and landslide processes means that any interpretation of landslide data remains mostly subjective. This causes major uncertainty in landslide risk assessment. Over the past decade, Australia’s Commonwealth Scientific and Indus

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Baliota, Georgia V., and Christos G. Athanassiou. "Evaluation of a Greek Diatomaceous Earth for Stored Product Insect Control and Techniques That Maximize Its Insecticidal Efficacy." Applied Sciences 10, no. 18 (2020): 6441. http://dx.doi.org/10.3390/app10186441.

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Laboratory bioassays were conducted to evaluate the insecticidal efficacy of a diatomaceous earth deposit from Greece, for a wide range of stored product insects. In this context, populations of five different insect species, Tribolium confusum Jacquelin DuVal, the confused flour beetle; Sitophilus oryzae (L.), the rice weevil; Rhyzopertha dominica (F.), the lesser grain borer; Oryzaephilus surinamensis (L.), the sawtoothed grain beetle; Cryptolestes ferrugineus (Stephens), the rusty grain beetle, which cover a major spectrum of insects species of stored products worldwide, were used in the bi

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Liu, Xian Shan. "Research on the Discontinuous Deformation Analysis for Hydro-Mechanical Coupling Model of the Fractured Rock Masses." Advanced Materials Research 594-597 (November 2012): 2500–2505. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2500.

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Fractured rock masses with many fractures will make the hydro-mechanical characteristics more complex. However, traditional equivalent continuous method just generally reflects the mechanical characteristics for the rocks including large fractures. In order to simulate the mechanical characteristics of the fractured rock masses under complex geotechnical environment, a new method based on Discontinuous Deformation Analysis (DDA) was forward to research on the hydro-mechanical effect. And use the method to analyze the dam foundation, the results compared with that considering non-coupling effec

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Gimenes, Evandro, and Gabriel Fernández. "Hydromechanical analysis of flow behavior in concrete gravity dam foundations." Canadian Geotechnical Journal 43, no. 3 (2006): 244–59. http://dx.doi.org/10.1139/t05-095.

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A key requirement in the evaluation of sliding stability of new and existing concrete gravity dams is the prediction of the distribution of pore pressure and shear strength in foundation joints and discontinuities. This paper presents a methodology for evaluating the hydromechanical behavior of concrete gravity dams founded on jointed rock. The methodology consisted of creating a database of observed dam behavior throughout typical cycles of reservoir filling and simulating this behavior with a distinct element method (DEM) numerical model. Once the model is validated, variations of key parame

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Santos, Verlei, Luiz Bressani, and Camila Smirdele. "Geotechnical behavior of gravity dams built on sedimentary rocks: pore pressures and deformations analysis of Dona Francisca HPP foundation." Soils and Rocks 46, no. 2 (2023): e2023013622. http://dx.doi.org/10.28927/sr.2023.013622.

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In Brazil, some dams have been built on sedimentary rock masses, which usually present greater deformability and permeability in comparison to metamorphic or igneous rock masses. This article describes a case study whose goal is to present and analyze the main data related to the monitoring of foundation behavior of the Dona Francisca dam, whose foundation is essentially constituted by sedimentary rocks. Dona Francisca gravity dam is a hydroelectric power plant (HPP) and was built in 2000, on the Jacuí River, in the central region of the Rio Grande do Sul State, Brazil. The analysis of the fou

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