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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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Underground mining of Shallow-Dipping Orebodies in Australia - Mechanised Updip Stoping Versus Transverse Retreat Panel Stoping

Underground Mining of Shallow-Dipping Orebodies in Australia...

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Twelfth International Symposium on Mine Planning and Equipment Selection

作者： Chanda, E.K. Corbett, C.J. Curtin University of Technology WA School of Mines Mining Engineering Program Locked Bag 22 Kalgoorlie WA 6433 Australia Thyssen Mining International TARA Mines Ireland

Many underground mining methods rely on blasted rock moving under gravity to report to extraction points. mining of orebodies dipping between 20 - 45 degrees poses a unique challenge for mining engineers in that a dip angle in this range will not allow the movement of broken ore down the footwall to the mucking horizon utilising gravity. This is more so in cases where the natural angle of repose of the rock is less than the dip of the orebody. Hence, innovative mining systems are necessary to mine this type of orebodies. In Australia, the method of uphole retreat panel stoping is commonly used to extract orebodies in the dip range of 20-45 degrees and thickness range of 5 - 15m. In the Zambian Copperbelt a method called continuous retreat updip stoping is used for orebodies with similar dips and thicknesses. The mechanised form of this mining method has potential for application in the metalliferous mining industry in Australia. In this study a comparison is made between mechanised updip (MUDS) and transverse retreat stoping (TRS) methods, A hypothetical nickel sulphide orebody located in Western Australia is used as case study. The net present value for mechanised updip stoping is seven per cent higher than that of transverse retreat stoping based on the assumptions applied. Initial results of this study indicate that mechanised updip stoping can be adopted for Australian mining conditions. However, lack of significant local experience with the method is often cited as a reason for not adopting it even in situations where it is clearly the best option.

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Effect of Pulse Parameters on the Particle Size of Copper Powder Electrodeposition 1

Effect of Pulse Parameters on the Particle Size of Copper Po...

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1st International Conference on Design and Application of engineering Materials 2018, IC-DAEM 2018 in conjunction with 11th Seminar Nasional Metalurgi dan Material, SENAMM 2018

作者： Wahyudi, S. Soepriyanto, S. Mubarok, M.Z. Sutarno Doctoral Program of Mining Engineering Faculty of Mining and Petroleum Institut Teknologi Bandung Bandung Indonesia Department of Material and Metallurgical Engineering Faculty of Engineering Institut Teknologi Sains Bandung Bekasi Indonesia Department of Metallurgical Engineering Faculty of Mining and Petroleum Institut Teknologi Bandung Bandung Indonesia Department of Metallurgical Engineering Faculty of Engineering Universitas Jenderal Achmad Yani Bandung Indonesia

In this paper, copper powder fabrication has been made via electrolysis method using CuSO4 and H2SO4 in aqueous media. Electrodeposition process of copper powder on a metallic surface is done by applying to continue current and pulse current with rectangular pulse waveform. Characterization of copper powder was carried out by SEM to confirm particle size and shape and EDX to determine the copper powder composition. In electrodeposition by applying to continue current to produce the copper powder with particle shape was dendritic, and the elemental composition of the powder was Cu and O. Regarding average particle size, pulse electrodeposition process produces the copper powder with average particle size up to 0.85μm, 72.6% smaller than if apply to continue current. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Particle size

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Impact of the 2004 Sumatra-Andaman Earthquake to the Stress Heterogeneity and Seismicity Pattern in Nothern Sumatra, Indonesia 2

Impact of the 2004 Sumatra-Andaman Earthquake to the Stress ...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Taufiq Rafie, Muhammad Sahara, David P Widiyantoro, Sri Dian Nugraha, Andri Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

Sumatra Island is a highly seismic active region due to its close location to the convergent zone between the Indo-Australian and Eurasian plates, and the existence of the Great Sumatran Fault (GSF). These conditions caused the island of Sumatra suffered from hundreds of earthquakes with Mw > 4 per year. Particularly, a 9.0 Mw Sumatra-Andaman 2004 earthquake occured in northern Sumatra which changed the in-situ stress and seismicity pattern. In such case, quantifying the tectonic stress perturbation prior and after 2004 Sumatra-Andaman earthquake is becoming key issue in assessing the seismic hazard. To invert the in-situ stress information in Sumatra, first we identify the fault plane from its auxiliary plane in the focal mechanism solutions using the fault instability criterion. There are 354 focal mechanisms data of earthquake with Mw > 5 and focal depths © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Earthquakes

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Performance Evaluation of Geothermal Power Production Using EES (Case Study Ulumbu Geothermal Power Production Unit 4 East Nusa Tenggara, Indonesia) 9

Performance Evaluation of Geothermal Power Production Using ...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Ediatmaja, Prajamukti Darmanto, Prihadi Setyo Maulana, Dimas Taha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Ulumbu geothermal working area (GWA) is in Ruteng district, East Nusa Tenggara province, Indonesia. Ulumbu GWA is owned by PLN. There are four geothermal power plants (GPP) in Ulumbu, which capacity 4 x 2.5 MW. It has operated since 2013. Steam used to generate electricity comes from ULB-2 production well. Wellhead temperature and pressure were 180-200°C and 11 bar. Ulumbu GPP Unit 4 uses a condensing type turbine. It has specific steam consumption (SSC) during commissioning around 9.8 T/MW. After 6 (six) years of operation, SSC becomes 10.04 T/MW on average. It gives a chance to perform optimization in the GPP's equipment. Before performing optimization, evaluation for every equipment based on as-built data is done by modeling using EES software. The method of evaluation is performed by thermodynamics analysis in each GPP's equipment. EES is chosen due to its simplicity to arrange many equations in a single window. EES could communicatively display calculation results through a parametric table, solution window, and diagram window. Operation data give information that turbine inlet pressure is operated under its specification. Turbine inlet pressure is operated under its specification because of the change of operating wellhead pressure. Non-Condensable Gas (NCG) content also decreases based on the last ULB-2 well fluid sampling. Using EES, parameter changes in turbine inlet pressure and NCG content are simulated to get optimum power generation value. The simulation results indicate that optimum turbine inlet pressure is obtained at 9.3 bar with SSC 9.17 T/MW. Ulumbu GPP Unit 4 that operated in that condition could reach cycle efficiency of about 10.39%. © Published under licence by IOP Publishing Ltd.

关键词： Thermodynamics

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Near-surface S-wave Estimation base on Inversion of Rayleigh Wave Dispersion Curve Using Genetic Algorithm 2

Near-surface S-wave Estimation base on Inversion of Rayleigh...

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2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Rubaiyn, Al Priyono, Awali Yudistira, Tedi Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

Multi-channel analysis of surface wave (MASW) is a suitable technique to infer shallow structure of vertical shear-wave velocity profile from seismic record data. The processing stage is focused on obtaining the reliable dispersion curves, and the final stage of the method is that to obtain the shear velocity model that can explain the observation. The genetic algorithm (GA) method, one of the global optimization approaches, has been implemented to obtain shear wave model from Rayleigh wave dispersion curve. The GA method mimic biological evolution in order to obtain the optimum solution. Application of GA method to two synthetic models for normal velocity profile and low velocity anomaly give good results indicated with small misfit. Finally, we demonstrate the GA to Rayleigh dispersion curve for real data which calculated by using phase-shift method. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Genetic algorithms

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Study of the Heat Loss Effect in Geothermal Steam Production Well 9

Study of the Heat Loss Effect in Geothermal Steam Production...

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9th ITB International Geothermal Workshop 2020, IIGW 2020

作者： Wardana, Andrian Putra Saptadji, Nenny Miryani Maulana, Dimas Taha Geothermal Engineering Master's Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jl. Ganesha 10 Bandung40132 Indonesia

Well casing and cement temperature can change during geothermal production operation. The change of temperature occurs because of the heat transfer from the geothermal fluid to the formation. The heat transfer occurs because of the temperature difference in geothermal fluid and formation. The heat of fluid moves to the casing, cement, and formation through convection and conduction. This research aims to develop the heat transfer model in the steam production well, predict the steam heat loss and its effect on every 100 m well increment, and predict the well casing and cement temperature distribution and their effect on every well segment. The heat transfer model is an analytical calculation model developed to be the base of the calculation of heat loss and a temperature drop of well casing and cement. This model was developed for the calculation of heat loss in steam production well. The model was compared with a simulator to test the suitability. The fluid flow pressure drop and well lithology were considered in this model. The heat loss was very low during the steam production. The heat loss could be higher, along with the formation temperature drop. The material thermal conductivity and the well segment's layer thickness could affect the steam heat transfer in the production well. © Published under licence by IOP Publishing Ltd.

关键词： Cements

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