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3rd IEEE World engineering Education Conference, EDUNINE 2019

作者： Delgado, Alexi Ayala, Betsabe Department of Engineering Mining Engineering Section Mining Engineering Section Pontificia Universidad Católica Del Perú-PUCP Lima Peru Systems Engineering Program Universidad de Ciencias y Humanidades Lima Peru

ISBN: (纸本)9781728116662

Mathematics is a topic very important to achieve success during education and for life. In this way, the factors that could influence on mathematics learning, from the point of the view of parents, were analyzed. The approach used in this study was the grey clustering method, which is based on the grey systems theory. The case study was conducted in Lima, Peru. The sample of parents was obtained at the final stage of national competition of mathematics, commonly called CONAMAT, carried out after of previous stages of classification. The parents were divided in two groups, primary education parents and secondary education parents. The results revealed that the factor more important that influenced on the preference from students for mathematics learning were the vocation from students to sciences and the motivation from students to mathematics. The results of this study could help to mathematics teacher or educational authorities from Peru to make the best decision on mathematics teaching and learning. Moreover, the grey clustering method showed its effectiveness during the application on the case study, and it could be applied to other studies from social sciences or educational sciences, as the grey clustering method considers the uncertainty within its analysis. © 2019 IEEE.

关键词： Motivation

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3D model of Krakatau volcano subsurface structure based on gravity data 1

3D model of Krakatau volcano subsurface structure based on g...

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1st International Seminar on Science and Technology 2018, ISST 2018

作者： Oemaiya, D.V. Santoso, D. Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Indonesia Applied and Exploration Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute Technology Bandung Indonesia

Krakatau is one of the volcano in Indonesia which has the destructive paroxysmal eruption. Eruption on 1883 was estimated had VEI of 6. The eruption was recorded as one among some most violent volcanic eruption event in the world. Gravity method is one of the geophysical methods that could delineate the subsurface structure base on density variation. Therefore, the objectives of this research are to reconstruct the 3D subsurface structure of the Krakatau volcano especially the approximate location and dimension of the magma chamber. The subsurface model of Krakatau was done by 3D modelling using residual anomaly map. In order to develop the status of magma chamber model, the available information on the geological map of Krakatau and surrounding area was used. Besides that, some information relative to the volcano such as the information derived from earthquake wave attenuation were utilized. The result of the study shows that position its volcano magma chamber is not directly vertical or oblique under the volcano crater and it has multiple chambers which trending northwest-southeast. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Volcanoes

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A Non-Linear Method for Hypocenter Determination around Central and East Java Region: Preliminary Result 2

A Non-Linear Method for Hypocenter Determination around Cent...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Muttaqy, Faiz Dian Nugraha, Andri Puspito, Nanang T Supendi, Pepen Rosalia, Shindy Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Bandung Indonesia

Java Island is highly active tectonic zone and also has a complex geological system as a result of Indo-Australian plate that subducted under the Eurasian plate. This complexity produces many large and destructive earthquakes. Moreover, Java is a most densely populated region in Indonesia. The precise earthquake location can define and evaluate the seismic hazard in the area. In this study, we determined hypocenter location around the central and east Java region by using a non-linear method. We manually picked P-and S-wave arrival time recorded by BMKG network for the time period of 2009 to 2017. We used the minimum 1D seismic velocity model of ak135 to locate the events. We used some criteria for the determination of event location including (i) at least recorded by 4 station which has clear onset P and S arrival, and (ii) has magnitude (MW) > 3. The seismicity in the study area is controlled by subduction and many active faults distributed along the Java Island, also clustered in several areas such as Kendeng thrust, Opak river fault, Kebumen, Banyuwangi, and others. The result of this study indicates the accurately main shallow seismicity zones in central and eastern part of Java region, and also confirm the presence of active inland faults. As further studies, we will conduct 1D velocity modeling and relocate the hypocenters using an updated local 1D velocity model beneath the study area. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Earthquakes

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A Lab-scale autonomous haul truck for underground mine operations: Design and development 123

A Lab-scale autonomous haul truck for underground mine opera...

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123rd ASEE Annual Conference and Exposition

作者： Becker, Loryn R. Wierzba, Ted J. Azizi, Mohsen Sergeyev, Aleksandr Tarshizi, Ebrahim O'Connor, Laura Claire Livernois, Ryan J. Michigan Technological University Electrical Engineering Technology Program Department of Geological and Mining Engineering and Sciences HoughtonMI United States

The objective of this project is to facilitate the use of automation in an underground mining environment. In an active underground mine, there are several hazards a worker can face. The implementation of autonomous control of the mobile equipment used in these mining operations is one of the ways to cut down the number of injuries. It can also result in less time wasted for the workers as well as an overall safer mining environment. With autonomous vehicles in underground mines, it is less likely for accidents to occur involving mine employees. In order to implement autonomous control, several different types of sensors must be installed. The utilized sensors include multiple ultrasonic range detectors, and an image processing unit. These sensors provide complementary data to an Arduino microcontroller for collision avoidance and tunnel navigation, respectively. Experiments will be conducted to test the performance and reliability of the developed autonomous underground mine truck. The performance (timing) results from the experimental data will be analyzed and compared to those results from the manual mode of operation of the haul truck. © American Society for engineering Education, 2016.

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Assessing the performance of various initial support systems for tunneling in swelling clay-A case study from the Manikin diversion tunnel in Indonesia 56

Assessing the performance of various initial support systems...

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56th U.S. Rock Mechanics/Geomechanics Symposium

作者： Prassetyo, S.H. Stephen Wattimena, R.K. Baskara, A. Mining Engineering Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung West Java Bandung Indonesia Tbk Manikin Dam Project Kupang Regency East Nusa Tenggara Indonesia

ISBN: (纸本)9780979497575

This paper describes the swelling phenomenon that occurs in the Manikin tunnel, an ongoing diversion tunnel for the Manikin Dam Project in Kupang, Indonesia, driven through swelling clay underlain by the Bobonaro Formation. The Manikin tunnel experiences significant large deformation, resulting in substantial damage to its initial supporting structures. Three initial support systems are assessed through numerical simulation using the 2-D finite element method, namely: (1) the original design, (2) larger steel-rib + invert beam, and (3) the original design with forepoling + invert beam. To represent the swelling phenomenon, a zone of ground strength reduction is developed in the area surrounding the tunnel, and swelling pressure is exerted on the initial lining. This method is able to match the results of convergence monitoring. Numerical simulations show that the original initial support design results in large convergence up to 89 cm or 11.4% strain and thickness of plastic zone up to 3 m, but the proposed alternative support systems are able to control the convergence much better. For the initial support with larger steel rib + invert beam, the convergence is only 14 cm or 1.8% strain, and for the original support with forepoling + invert beam, the convergence is only 9 cm or 1.2% strain. This paper points out that the original support design with forepoling + invert beam yields the best supporting method as it results in the smallest horizontal and diagonal convergences. © 2022 ARMA, American Rock Mechanics Association.

关键词： Rock mechanics

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Prompt ion-induced autoradiography and its application for the determination of deuterium

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Nuclear Instruments and Methods 1981年第1-3期185卷 505-512页

作者： Ilić, Radomir Altstetter, Carl Nuclear Engineering Program United States Department of Metallurgy and Mining Engineering Materials Research Laboratory University of Illinois at Urbana Champaign IL 61801 United States

A new technique called Prompt Ion-Induced Autoradiography (PIIA) is proposed and applied to the imaging of light isotope distribution in solids. PIIA utilizes a beam of ions which undergo a nuclear reaction with the isotope species to be detected. The product particles generated within the target are recorded with a solid state nuclear track detector placed in contact with the target. Resolution in the plane of a thin specimen is of the order of 1 μm with detection sensitivity of better than 1 at. ppm. The method is illustrated using the ²D(³He, p)⁴He nuclear reaction to image deuterium distribution in a Hastelloy G foil 6 μm thick. © 1981.

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Effect of ZnO nanoparticles on grain refinement of Mg-Al-Zn alloy by thixoforming process 6th

Effect of ZnO nanoparticles on grain refinement of Mg-Al-Zn ...

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6th International Conference on Mathematics and Natural Sciences, ICMNS 2016

作者： Kusharjanto Soepriyanto, S. Korda, A.A. Dwiwanto, S.A. Graduate program Mining Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung Indonesia Metallurgical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung Indonesia Bandung 40285 Indonesia

ISBN: (纸本)9783035715316

Thixoforming process is one method to improve the mechanical properties, especially in the manufacture of magnesium alloy components. This method is an alternative to lightweight structures and simultaneously efficient use of raw materials, fuel efficiency and environmental friendliness. The aim of this study is investigates the effect of ZnO nanoparticles addition on grain refinement of Mg-Al-Zn alloy by thixoforming. In these experiments, ZnO nanoparticles added from 0.1, 0.2, 0.3, 0.4 and 0.5 wt. % to Mg-Al-Zn alloy and thixoforming temperature set-up at 530°C. The results showed that the increasing of weight % ZnO nanoparticles cause decreasing grain size average of Mg-Al-Zn alloy both as-cast and thixoforming. On 0.5 wt. % ZnO addition was obtained grain refinement 39.87 μm (decreased 29.29%) and hardness 73.80 HB (increased 53.94%) compared to as-cast. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Aluminum alloys

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Dynamic stability of mine slopes due to bench blasting 14th

Dynamic stability of mine slopes due to bench blasting

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14th International Congress on Rock Mechanics and Rock engineering, ISRM 2019

作者： Prassetyo, S.H. Simangunsong, G.M. Sadikin, A. Mining Engineering Program Institut Teknologi Bandung Bandung Indonesia Adimitra Baratama Nusantara East Borneo Indonesia

ISBN: (纸本)9780367422844

In this paper, analysis of dynamic stability is carried out for highwall and lowwall slopes in an open cut coal mine in Indonesia. An explicit-based finite difference program called Fast Lagrangian Analysis of Continua (FLAC) is used to perform the static and dynamic simulations of the mine slopes to monitor various problems during the seismic excitation from the blast wave, including the maximum permanent deformation, the peak particle acceleration (PPA), and the peak particle velocity (PPV). Two stability criteria are used to evaluate the dynamic stability of the slopes due to blasting: (1) the maximum permanent deformation and (2) the dynamic factor of safety (FoS). The results of dynamic simulations in FLAC suggest that the blast pattern should be designed so that it will not exceed the predicted PPV = 18 mm/s and PPA = 0.04 g for the highwall slope and the predicted PPV = 34 mm/s and PPA = 0.08 g for the lowwall slope. In addition, unlike the PPA, the maximum permanent displacement is not that sensitive to the stability of the mine slopes under dynamic loading. © 2020 ISRM.

关键词： Coal mines

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Preliminary Gravity Study of Pre-Tertiary and Tertiary Rock in Northern Kebumen, Central Java, Indonesia 2

Preliminary Gravity Study of Pre-Tertiary and Tertiary Rock ...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Nizar Ahmady, Faridz Santoso, Djoko Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung40132 Indonesia Applied Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung40132 Indonesia

Luk Ulo Melange Complex is a Pre-Tertiary rock formation consisting of various lithological background and complicated geological structure. Located in Northern Kebumen Regency, this rock is originally interpreted as products of tectonic process caused by paleo-subduction between Indian Oceanic Plate beneath Eurasian Plate in Cretaceous age. According to previous study on geological surface investigation shows that the melange complex is tectonically overlain by Tertiary sedimentary formation. On the contrary, geophysical study of the subsurface condition of the area is still under discussion due to limited of measured data. In order to obtain detailed subsurface image, gravity profiling was measured and interpreted across both Tertiary and pre-Tertiary rock. Frequency domain filter and designed moving average filter were used to separate residual and regional anomaly. The results denote gravity value of residual anomaly varying from -5 to +5 mGal, while regional anomaly is ranging from 150-180 mGal respectively. The preliminary interpretation was developed by taking into account the geological information and also the data that was collected during field campaign. Overall, high gravity anomaly is interpreted as diabase intrusion in the middle of research area. Meanwhile, low gravity anomaly indicated clay rich rock material related to matrix content of Luk-Ulo Melange Complex in the northern area. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Frequency domain analysis

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Petrophysics and rock physics using VTI model for low permeability and high porosity reservoir in CCS Gundih gas field pilot project, Indonesia 2

Petrophysics and rock physics using VTI model for low permea...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Fatkhan Danio, H. Anggarini, L.T. Mudatsir, O.A. Sule, M.R. Seismology Exploration and Engineering Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Geological Engineering Study Program Universitas Pertamina Indonesia Geological Engineering Study Program Institut Teknologi Bandung Indonesia

A pilot Carbon Capture and Storage (CCS) project in Indonesia is planned to be implemented in Gundih area, Central Java Province in Indonesia. Prior to conducting CO2 injection, reservoir characterisations have to study thoroughly to assure that the reservoir is to meet with CCS standard requirements. The Jepon well in the Gundih fied was proposed as a suitable site for CO2 injection. The decision was made to proceed with a comprehensive site assessment and geological modelling of the Jepon area. This site was selected based on the reason the presence of a potentially suitable reservoir (Ngrayong Sandstone) and primary and secondary seals (Bulu Limestone and Wonocolo claystone). Using logging data, petrophysics and rock physics model are used to evaluate potential of the CO2 injection site. Permeability results from petrophysics calculations and recent injection tests show very small;whilst porosity is relatively high. This can be caused by fractures mostly are not connected. Hence, rock physics for the reservoir is evaluated and modelled as anisotropy or Vertical Tranverse Isotropy (VTI) in which fractures with preferred orientation. Stiffness calculations for VTI medium with different aspect ratio shows consistent with low permeability result. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Carbon capture

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