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Evaluating The Performance Of Extreme Learning Machine Technique For Ore Grade Estimation, Clara Akalanya Abuntori, Sulemana Al-Hassan, Daniel Mireku-Gyimah, Yao Yevenyo Ziggah 2021 University of Mines and Technology

Evaluating The Performance Of Extreme Learning Machine Technique For Ore Grade Estimation, Clara Akalanya Abuntori, Sulemana Al-Hassan, Daniel Mireku-Gyimah, Yao Yevenyo Ziggah

Journal of Sustainable Mining

Due to the complex geology of vein deposits and their erratic grade distributions, there is the tendency of overestimating or underestimating the ore grade. These estimated grade results determine the profitability of mining the ore deposit or otherwise. In this study, five Extreme Learning Machine (ELM) variants based on hard limit, sigmoid, triangular basis, sine and radial basis activation functions were applied to predict ore grade. The motive is that the activation function has been identified to play a key role in achieving optimum ELM performance. Therefore, assessing the extent of influence the activation functions will have on the final ...


Development Of A Marine Biodegradable Target Balloon, Blake Samuel Robinson, Arash Sam Akhavi, David Leonardo Albarran-Martinez 2021 California Polytechnic State University, San Luis Obispo

Development Of A Marine Biodegradable Target Balloon, Blake Samuel Robinson, Arash Sam Akhavi, David Leonardo Albarran-Martinez

Materials Engineering

The US Navy utilizes PVC target balloons, known as Killer Tomatoes, that are inflated onboard a naval vessel then deployed into the ocean to calibrate a variety of weaponry. The Navy has requested the investigation of biodegradable polymers to replace the PVC in attempts to reduce ocean waste that is generated from the leftover PVC material. After communicating with American Pacific Plastic Fabricators (APPF), the current manufacturer of the Killer Tomatoes, we gained an understanding of the manufacturing process and the material requirements that would allow a new material to be integrated into their current process. Two proprietary, trial polymers ...


Characterization Of Landslide Processes From Radar Remote Sensing And Hydromechanical Modeling, Yuankun Xu 2021 Southern Methodist University

Characterization Of Landslide Processes From Radar Remote Sensing And Hydromechanical Modeling, Yuankun Xu

Earth Sciences Theses and Dissertations

Landsides are a natural geomorphic process yet a dangerous hazard which annually causes thousands of casualties and billions of property loss in a global scale. Understanding landslide motion kinematics from early initiation to final deposition is critical for monitoring, assessing, and forecasting landslide movement in order to mitigate their hazards. Landslides occur under diverse environmental settings and appear in variable types; however, all types of landslides can be mechanically attributed to shearing failure at the basal surface due to stress regime shift contributed by internal and/or external forcing. Typical internal factors include soil/rock weathering, whereas typical external triggering ...


Die Entstehung Der Steinkohle Und Verwandter Bildungen Einschliesslich Des Petroleums, Henry Potonié 2021 Livre de Lyon

Die Entstehung Der Steinkohle Und Verwandter Bildungen Einschliesslich Des Petroleums, Henry Potonié

Engineering Sciences

No abstract provided.


Geophysical Observations Of Taliks Below Drained Lake Basins On The Arctic Coastal Plain Of Alaska, R. C. Rangel, A. D. Parsekian, L. M. Farquharson, B. M. Jones, N. Ohara, A. L. Creighton, B. V. Gaglioti, M. Kanevskiy, A. L. Breen, H. Bergstedt, V. E. Romanovsky, K. M. Hinkel 2021 University of Wyoming

Geophysical Observations Of Taliks Below Drained Lake Basins On The Arctic Coastal Plain Of Alaska, R. C. Rangel, A. D. Parsekian, L. M. Farquharson, B. M. Jones, N. Ohara, A. L. Creighton, B. V. Gaglioti, M. Kanevskiy, A. L. Breen, H. Bergstedt, V. E. Romanovsky, K. M. Hinkel

Michigan Tech Publications

Lakes and drained lake basins (DLBs) together cover up to ∼80% of the western Arctic Coastal Plain of Alaska. The formation and drainage of lakes in this continuous permafrost region drive spatial and temporal landscape dynamics. Postdrainage processes including vegetation succession and permafrost aggradation have implications for hydrology, carbon cycling, and landscape evolution. Here, we used surface nuclear magnetic resonance (NMR) and transient electromagnetic (TEM) measurements in conjunction with thermal modeling to investigate permafrost aggradation beneath eight DLBs on the western Arctic Coastal Plain of Alaska. We also surveyed two primary surface sites that served as nonlake affected control sites ...


Evaluation Of Undeveloped Hard Coal Deposits And Estimation Of Hard Coal Reserves In The Upper Silesian Coal Basin, Poland, Tomasz Urych, Jarosław Chećko, Marek Rosa, Anna Wątor 2021 Central Mining Institute, Katowice, Poland

Evaluation Of Undeveloped Hard Coal Deposits And Estimation Of Hard Coal Reserves In The Upper Silesian Coal Basin, Poland, Tomasz Urych, Jarosław Chećko, Marek Rosa, Anna Wątor

Journal of Sustainable Mining

The article presents the results of works concerning evaluation of undeveloped deposits in the Upper Silesian Coal Basin and an estimation of hard coal reserves which can be developed by 2050. Evaluation of hard coal deposits was established on criterions choice and their score determination. On the basis of obtained the final score and after consultations with experts in the field of hard coal mining, there were selected three areas of undeveloped deposits with the amount of about 1.99 Gt (billion metric tons) of anticipated economic resources which can extend the coal reserve base located in the direct vicinity ...


Application Of Remote Sensing For Permafrost Monitoring In Alaska, Iuliia V. Tcibulnikova 2021 Michigan Technological University

Application Of Remote Sensing For Permafrost Monitoring In Alaska, Iuliia V. Tcibulnikova

Dissertations, Master's Theses and Master's Reports

Permafrost covers about 85% of the state of Alaska; it is a fragile cryogenic phenomenon prone to degradation under thermal and mechanical (natural and anthropogenic) influences. This research analyzes the application of remote sensing for permafrost monitoring in the Prudhoe Bay area, Alaska. Thawing thermokarst lakes are assessed as the signs of permafrost degradation. Normalized Difference Water Index (NDWI) was used to detect thaw lakes in Landsat-8 satellite imagery within the 529-km2 study area in 2013 and 2020. The lakes were then mapped according to their size and growth rate. Lakes do not grow uniformly; some lakes grow while ...


Application Of 3d Seismic Signal And Geomechanical Attributes For Subsurface Fracture Characterization: A Case Study In Clearfield County, Central Pennsylvania, Iman F. Zulkapeli 2021 West Virginia University

Application Of 3d Seismic Signal And Geomechanical Attributes For Subsurface Fracture Characterization: A Case Study In Clearfield County, Central Pennsylvania, Iman F. Zulkapeli

Graduate Theses, Dissertations, and Problem Reports

Hydrocarbon exploration in unconventional reservoirs is highly risky due to the nature of the reservoirs and the variability in fractures and reservoir geomechanical properties in the subsurface. The reservoir needs to be fully characterized to avoid any complication such as frac hit, wellbore failure, blowout, or even a dry hole. The Clearfield reservoir produces an exceptionally low amount of gas, compared to the neighboring region in the proximity, which has been poorly understood. This raises the question as to what causes the reservoir to have low productivity.

This study focuses on the natural fracture characterization using high-quality 3D seismic signal ...


A Generalized Bayesian Approach For Localizing Static Natural Obstacles On Unpaved Roads, Yoshito Kinoshita, Josiah Steckenrider, Ioannis Papakis, Tomonari Furukawa 2020 Komatsu

A Generalized Bayesian Approach For Localizing Static Natural Obstacles On Unpaved Roads, Yoshito Kinoshita, Josiah Steckenrider, Ioannis Papakis, Tomonari Furukawa

West Point Research Papers

This paper presents an approach that implements sensor fusion and recursive Bayesian estimation (RBE) to improve a vehicle's ability to perform obstacle detection and localization in unpaved road environments. The proposed approach utilizes RADAR, LiDAR and stereovision fully for sensor fusion to detect and localize static natural obstacles. Each sensor is characterized by a probabilistic sensor model which quantifies level of confidence (LOC) and probability of detection (POD) associatively. Deploying these sensor models enables the fusion of heterogeneous sensors without extensive formulations and with the incorporation of each sensor's strengths. An Extended Kalman filter (EKF) is formulated and ...


Application Of The Ground Laser Scanning Results In Monitoring Of Adjacent Rock Masses Of Deep Careers, Sh Rahimov 2020 TSTU

Application Of The Ground Laser Scanning Results In Monitoring Of Adjacent Rock Masses Of Deep Careers, Sh Rahimov

Technical science and innovation

The method of laser scanning, used in combination with the traditional mine surveying, is one of the most effective and safest ways to carry out mine surveying and instrumental observations on deforming areas of open mining objects. The article presents the results of ground-based laser scanning of the Kharanutsky coal pit and a comparative analysis to determine the deformations and displacements of the sides for different periods, which was performed in the RISCAN PRO environment. Digital elevation models (DEM) were built, distinguishing observation cycles by color. As a result of comparison, the places of manifestation of deformations and displacements were ...


Cosmostruct Ural Model Of The Malguzar Mountains For Ore Bearing Data Processing On The Laiyagun Mineralized Zone, A Abdullayev, O Zokirov, G Anna, E Kutie, Sh Akhmedov 2020 TSTU

Cosmostruct Ural Model Of The Malguzar Mountains For Ore Bearing Data Processing On The Laiyagun Mineralized Zone, A Abdullayev, O Zokirov, G Anna, E Kutie, Sh Akhmedov

Technical science and innovation

Analysis of geological prospecting, geological surveying, geochemical and other materials of the territory of the Malguzar Mountains allows us to note that here the ore-bearing formations are Silurian formations (sandstones, gravelstones, shales), crumpled into folds, which are complicated by a series of faults of north-west strike, zones of splitting and etc. These structures are rectilinear, their zone is characterized by the presence of small fracture structures, areas of swellings (Liyagun mineralized zone) and splits (Ardakshan area). The reason for these swelling and splitting, where gold mineralization is noted, remains not fully studied. The importance of studying these features of ore-controlling ...


Bibliometric Survey On Effect Of Climate Factors On Spread Of Coronavirus (Covid-19), seema patil, Jay Makwana, Manish Attri 2020 Symbiosis International University

Bibliometric Survey On Effect Of Climate Factors On Spread Of Coronavirus (Covid-19), Seema Patil, Jay Makwana, Manish Attri

Library Philosophy and Practice (e-journal)

The new SARS-CoV-2 COVID-19 has spread quickly around the globe since it was first reported in Wuhan city of China, in December 2019 subsequent to being contracted from a zoonotic source. The main focus of this bibliometric survey is to recognize the few studies which have upheld the epidemiological hypothesis that the effect of climatic factors is playing a crucial role in the spreading of COVID-19. The analysis is done on the basis of 412 documents such as journals, articles, editorials, short surveys and some review papers. The United States contributes to the maximum number of publications followed by the ...


Optimum Location Of Last-Mined Stope With The Influence Of Backfilling, Huawei Xu, Derek B. Apel 2020 University of Alberta

Optimum Location Of Last-Mined Stope With The Influence Of Backfilling, Huawei Xu, Derek B. Apel

Journal of Sustainable Mining

Many mines in Canada have adopted sublevel stoping method or one of its variations, such as blasthole stoping (BHS) and sublevel longhole retreat (SLR), for the extraction of steeply dipping orebodies. Stope, as the basic excavated element, plays a significant role in the whole process of mining activity. In the mining method of BHS, crossing cuts are excavated at tops and bottoms in each stope for drilling blast holes and transportation of mined out orebodies. Crossing cuts failure may result in prolonged production interruption, fatality, and equipment loss. After the completion of orebodies excavation from the sublevel open stope, the ...


Laboratory Testing And Mechanistic Analysis Of Treated Subgrade Soils, Hari Kumar Reddy Yarrapureddi 2020 University of Texas at Tyler

Laboratory Testing And Mechanistic Analysis Of Treated Subgrade Soils, Hari Kumar Reddy Yarrapureddi

Civil Engineering Theses

Calcium-based stabilizing agents such as cement and lime have been extensively used to improve the engineering properties of base and subgrade layers of pavement systems. Recently, polymers and chemical stabilizers have become popular due to cost efficiency, ease of application, and fast curing times. In this study, California Bearing Ratio (CBR) values of polymer and chemical treated soils were compared with the CBR values of soils treated with conventional stabilizers. Parametric sensitivity analyses was carried out on key parameters including the type of subgrade soil, stabilizing agent, stabilizing agent treatment levels, and moisture conditioning. Additionally, numerical analyses was performed to ...


Hydrogen Wettability Of Sandstone Reservoirs, Stefan Iglauer, Muhammad Ali, Alireza Keshavarz 2020 Edith Cowan University

Hydrogen Wettability Of Sandstone Reservoirs, Stefan Iglauer, Muhammad Ali, Alireza Keshavarz

Research Datasets

Data set include the data for contact angle data as a function of pressure, temperature and stearic acid concentration in H2. One exemplary figure is also provided for contact angle measurement in H2 atmosphere.


Version 2 Ozone Monitoring Instrument So2 Product (Omso2 V2): New Anthropogenic So2 Vertical Column Density Dataset, Can Li, Nickolay A. Krotkov, Peter J.T. Leonard, Simon Carn, Joanna Joiner, Robert J.D. Spurr, Alexander Vasilkov 2020 University of Maryland

Version 2 Ozone Monitoring Instrument So2 Product (Omso2 V2): New Anthropogenic So2 Vertical Column Density Dataset, Can Li, Nickolay A. Krotkov, Peter J.T. Leonard, Simon Carn, Joanna Joiner, Robert J.D. Spurr, Alexander Vasilkov

Michigan Tech Publications

The Ozone Monitoring Instrument (OMI) has been providing global observations of SO2 pollution since 2004. Here we introduce the new anthropogenic SO2 vertical column density (VCD) dataset in the version 2 OMI SO2 product (OMSO2 V2). As with the previous version (OMSO2 V1.3), the new dataset is generated with an algorithm based on principal component analysis of OMI radiances but features several updates. The most important among those is the use of expanded lookup tables and model a priori profiles to estimate SO2 Jacobians for individual OMI pixels, in order to better characterize pixel-to-pixel variations in SO2 sensitivity including ...


Constructing A Complete Landslide Inventory Dataset For The 2018 Monsoon Disaster In Kerala, India, For Land Use Change Analysis, Lina Hao, Rajaneesh A., Cees Van Westen, Sajinkumar K. S., Tapas Ranjan Martha, Pankaj Jaiswal, Brian G. McAdoo 2020 Chengdu University of Technology

Constructing A Complete Landslide Inventory Dataset For The 2018 Monsoon Disaster In Kerala, India, For Land Use Change Analysis, Lina Hao, Rajaneesh A., Cees Van Westen, Sajinkumar K. S., Tapas Ranjan Martha, Pankaj Jaiswal, Brian G. Mcadoo

Michigan Tech Publications

Event-based landslide inventories are important for analyzing the relationship between the intensity of the trigger (e.g., rainfall, earthquake) and the density of the landslides in a particular area as a basis for the estimation of the landslide probability and the conversion of susceptibility maps into hazard maps required for risk assessment. They are also crucial for the establishment of local rainfall thresholds that are the basis of early warning systems and for evaluating which land use and land cover changes are related to landslide occurrence. The completeness and accuracy of event-based landslide inventories are crucial aspects to derive reliable ...


Using Tandem-X To Measure Pyroclastic Flow Source Location, Thickness And Volume: Application To The 3rd June 2018 Eruption Of Fuego Volcano, Guatemala, F. Albino, J. Biggs, R. Escobar-Wolf, A. Naismith, M. Watson, J. C. Phillips, G. A. Chigna Marroquin 2020 University of Bristol

Using Tandem-X To Measure Pyroclastic Flow Source Location, Thickness And Volume: Application To The 3rd June 2018 Eruption Of Fuego Volcano, Guatemala, F. Albino, J. Biggs, R. Escobar-Wolf, A. Naismith, M. Watson, J. C. Phillips, G. A. Chigna Marroquin

Michigan Tech Publications

The estimation of the volume of volcanic flows during an ongoing eruption is challenging but this information is crucial for improving risk assessment and for forecasting future events. Although previous studies have shown the ability of TanDEM-X satellite data to derive the thickness and the volume of lava flow fields during effusive eruptions, the method has not been explored yet for pyroclastic flows. Using bi-static interferometry, we produce TanDEM-X DEM on Fuego volcano (Guatemala) to measure the significant topographic changes caused by the 3rd June 2018 eruption, which destroyed the town of San Miguel Los Lotes. We estimate the volume ...


Wetting-Driven Formation Of Present-Day Loess Structure, Yanrong Li, Weiwei Zhang, Shengdi He, Adnan Aydin 2020 Taiyuan University of Technology

Wetting-Driven Formation Of Present-Day Loess Structure, Yanrong Li, Weiwei Zhang, Shengdi He, Adnan Aydin

Faculty and Student Publications

© 2020 The Authors Present-day loess, especially Malan loess formed in Later Quaternary, has a characteristic structure composed of vertically aligned strong units and weak segments. Hypotheses describing how this structure forms inside original loess deposits commonly relate it to wetting-drying process. We tested this causal relationship by conducting unique experiments on synthetic samples of initial loess deposits fabricated by free-fall of loess particles. These samples were subjected to a wetting-drying cycle, and their structural evolutions were documented by close-up photography and CT scanning. Analysis of these records revealed three key stages of structural evolution: initiation (evenly distributed cracks appear due ...


Effect Of Geometry And Fluid Viscosity On Dynamics Of Fluid-Filled Cracks: Insights From Analog Experimental Observations, Haitao Cao, Ezequiel F. Medici, Gregory P. Waite, Roohollah Askari 2020 Michigan Technological University

Effect Of Geometry And Fluid Viscosity On Dynamics Of Fluid-Filled Cracks: Insights From Analog Experimental Observations, Haitao Cao, Ezequiel F. Medici, Gregory P. Waite, Roohollah Askari

Michigan Tech Publications

Fluid-filled volumes in geological systems can change the local stress field in the host rock and may induce brittle deformation as well as crack propagation. Although the mechanisms relating fluid pressure perturbations and seismicity have been widely studied, the fluid-solid interaction inside the crack of a host rock is still not well understood. An analog experimental model of fluid intrusion in cracks between planar layers has been developed to study stress conditions at the margins and tips. A combined high-speed shadowgraph and a photoelasticity imaging system is used to visualize the fluid dynamics and induced stresses on the solid matrix ...


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