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International Conference on Sustainable Energy engineering and Application (ICSEEA)

作者： Reza Huwae Anjar Susatyo Ridwan Arief Subekti Henny Sudibyo Deni Shidqi Khaerudini Program of Study Nagister in Mechanical Engineering Mercu Buana University Jakarta Indonesia Indonesian Institute of Sciences (LIPI) Bandung Indonesia FMIPA Universitas Indonesia Depok Indonesia Indonesian Institute of Sciences (LIPI) Serpong Indonesia

ISBN: (数字)9781728188492

ISBN: (纸本)9781728188508

Energy demand is increasing and it raise a climate change issue. Greenhouse emissions, depleted fossil energy resources, increasing fossil energy cost are reasons to maximize the utilization of renewable energy source. Hydropower extend an alternative energy source to cover the growing energy demand and release no emission at the same time for maintaining the climate change. In recent years, major focus of hydropower research is moving to small hydropower, as large hydropower opportunities are exploited and have high capital expenditure to build. A water vortex stream is a common phenomenon that we can see everyday life. Water flow out from the bathtub through outlet or water flow down in the sink after we finish washing the dishes, that is what we call vortex flow. and is a free-surface flow, homogenous fluid that contained water and air. This water vortex can be applied in low head small hydropower plant, recently known as gravitational water vortex power plant. River off Gravitational Water Vortex power plant (GWVPP) is one of low head turbine that can be used to generate electricity in small scale, pico-hydro. This study is focus on basin geometry. Models are developed to investigate the outlet diameter, depth discharge and basin geometry. It is found out that parameter of the basin should refer to source, which are flow rate, and the head of the water. It shows that spiral geometry for the basin gives symmetric and strong vortex and can be used as an alternative of conical basin.

关键词： Solid modeling Mathematical model Geometry Orifices Computational modeling Numerical models Hydroelectric power generation

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Gravitational Water Vortex Hydropower: Experimental Investigation of Free Surface Wave in Water Intake Channel

Gravitational Water Vortex Hydropower: Experimental Investig...

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International Conference on Sustainable Energy engineering and Application (ICSEEA)

作者： Reza Huwae Anjar Susatyo Ridwan Arief Subekit Henny Sudibyo Deni Shidqi Khaerudini Program of Study Nagister in Mechanical Engineering Mercu Buana University Jakarta Indonesia Indonesian Institute of Sciences (LIPI) Bandung Indonesia FMIPA Universitas Indonesia Depok Indonesia Indonesian Institute of Sciences (LIPI) Serpong Indonesia

ISBN: (数字)9781728188492

ISBN: (纸本)9781728188508

Development program for construction of irrigation channel gives big opportunity for development of renewable energy from small low head hydropower source. The use of hydropower gives no negative impact to environment, especially for greenhouse emission. A gravitational vortex hydropower is the object of this study, with the focus on the water intake channel using rectangular geometry. An experimental study was conducted to find the influencing parameters on the intake section of the gravitational vortex hydropower. A set of parameters were varied to determine which parameters affecting the water surface at the intake channel. By analyzing the results of the experiments, the influence of parameters on the water intake channel of gravitational vortex hydropower was found. A performance curve for differentiation of flow type and identification of surface contour has been made. Based on the results of the experiment, placing a strainer at 5 cm distance gave 60% higher output power since this setting could reduce the wave speed. Recommendation to have further study in non-dimensional parametric should be considered for increasing efficiency of the gravitational vortex hydropower.

关键词： Hydroelectric power generation Surface waves Geometry Torque Velocity measurement Torque measurement Shape

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mechanical Properties of Hybrid Marble Powder and Kenaf Fibre Reinforced Polyester Resin Composites

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IOP Conference Series: Materials Science and engineering 2019年第1期506卷

作者： Nuzuli Fitriadi Lindawati Ismi Ardiansyah Mechanical Engineering Study Program Politeknik Aceh Selatan

Kenaf fibre is one of the strongest natural fibres in the world today. Therefore, the purpose of this study is to create a new composite of Kenaf fibres combined with marble waste powder. The incorporation of marble powders and Kenaf fibres using a matrix of a polyester resin type has never been done. Thus, this study aims to create and test various composite material composites (mixture of matrix, marble powder and Kenaf fibre) which will produce different mechanical properties and obtain good tensile strength in test specimens with several composition variations. Preparation of test specimens was carried out with 4 (four) compositions of matrix mix and marble powder; 50:50, 60:40, 70:30 and 80:20 with the weight of Kenaf fibre is fixed 2 gram. The largest tensile test value is 63,407 MPa, obtained from 80:20 composition with the largest E value 3,03GPa. The largest compression test value is 33.49, obtained from the composition of 60:40 with the largest E value of 2,35GPa. The largest bending test value is 19.80 MPa, obtained from the composition of 80:20 with the largest E value of 36,55GPa. From the research results of tensile test, compression test, and bending test which possess good value is between 60:40 and 70:30 of composition ratio.

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Multilayer thin film growth on crystalline and quasicrystalline surfaces: A phase-field crystal study

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Physical Review B 2012年第24期85卷 245428-245428页

作者： Srevatsan Muralidharan Raika Khodadad Ethan Sullivan Mikko Haataja Department of Mechanical and Aerospace Engineering Princeton Institute for the Science and Technology of Materials (PRISM) Program in Applied and Computational Mathematics (PACM) Princeton University Princeton New Jersey 08544 USA and School of Mathematics Institute for Advanced Study Princeton New Jersey 08540 USA

In this paper, we explore the effects of misfit strain fields on both heterogeneous nucleation behavior and anisotropic growth of islands at submonolayer coverages and compositional patterning at complete monolayer coverage via simulations of a phase-field crystal model. In particular, deposition on top of a herringbone structure and quasicrystalline (QC) substrate are considered, the former representing a system with spatially periodic misfit strain fields arising from the presence of surface dislocations, and the latter representing a system which inherently possesses a wide range of local, aperiodic misfit patterns. In the case of single-component systems, we demonstrate that misfit strain fields lead to heterogeneous nucleation behavior and anisotropic island growth. In the case of QC substrate, a wide range of morphologies, such as coexistence of locally hexagonally ordered atomic clusters within a larger scale arrangement with overall QC symmetry and so-called “starfish” aggregates, is observed in a pure system at submonolayer coverages when the adlayer-substrate interaction strength and lattice mismatch are tuned. In the case of bulk-immiscible binary systems at complete monolayer coverage, strain-stabilized compositional domains emerge at low line tension values for both substrates. Interestingly, the compositional domains on the QC substrate inherit their symmetries at sufficiently low line tension values, while at larger line tension values, the domain structure begins to resemble the classical spinodal microstructure. Such domain structures should be readily observable in colloidal systems in which attractive interparticle and particle-substrate interactions can be tuned.

关键词： THIN films CRYSTALS NUCLEATION DISLOCATIONS in crystals MICROSTRUCTURE

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Pyrolysis study of coconut leaf's biomass using thermogravimetric analysis

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IOP Conference Series: Materials Science and engineering 2019年第1期539卷

作者： I M Rajendra I N S Winaya A Ghurri I K G Wirawan Study Program of Doctoral Engineering Sciences Faculty of Engineering University of Udayana Mechanical Engineering Department Bali State Polytechnic Study Program of Mechanical Engineering Faculty of Engineering University of Udayana

Coconut leaf is one of the most potential biomass to be converted into bio-oil through pyrolysis process and the availability in Indonesia is abundance. The mechanism of decomposition of coconut leaf into bio-oil productions requires further research because of the complexity of pyrolysis and differences in biomass composition. Therefore, the design, optimization and modeling of pyrolysis processes is strongly influenced by biomass characteristics. The purpose of this study was to find the characteristic differences in pyrolysis behavior of the three main parts of coconut leaf based on its constituent parts; leaflets, midrib and whole leaf. Moisture is removed by drying the sample in an electric oven at 110°C for 24 hours. Characteristics were tested using Cellulose Analysis, Ultimate Analysis, and Heat Value, whereas pyrolysis behavior used Thermogravimetric Analyzer (TGA). The results show that leaflets, midrib and whole leaf exhibit different pyrolysis behavior. In terms of considering flow process of separation, the whole leaf becomes an option as a fuel for further pyrolysis processes. The maximum temperature that as a reference in the pyrolysis process of coconut leaves is 500°C with temperature rate of 20°C/min and the process lasts as long for 130 minutes.

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Soil resistivity study and simulation with finite elements method

Soil resistivity study and simulation with finite elements m...

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IEEE International Conference on Environment and Electrical engineering

作者： Thiago Martins Pereira Rodrigo Alves de Lima Viviane Margarida Gomes Sóstenes Gutembergue Aylton José Alves Wesley Pacheco Calixto Electrical Mechanical & Computer Engineering School EMC Federal University of Goias UFG Experimental & Technological Research and Study Group NExT Federal Institute of Goias IFG Program in Electronic Systems and Automation PGEA University of Brasilia UnB

ISBN: (纸本)9781509023219

This work purpose is to study the influence of concrete buried structures in grounding systems. Comparison of soil characteristics between dry and rainy seasons and soil electrical behavior was carried out. Simulations in finite element method was performed for tree layer stratified soil and the electrostatic equipotential surfaces were mapped into the region of interest.

关键词： Grounding systems finite elements method climate seasonality

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Hardness improvement of aluminum alloy 2024 t3 after artificial aging treatment

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IOP Conference Series: Materials Science and engineering 2019年第1期539卷

作者： I M Astika Mechanical Engineering Study Program Faculty of Engineering Udayana University Indonesia

The needs of having strong and light material for many construction is increasing. Aluminum is one of materials that fulfill this requirement with other advantages such as corrosion resistant and easily formed. Generally, hardness of aluminum and its alloys is lower than ferrous metal such as iron and steel. Aluminum hardness improvement can be conducted by heat treatment namely artificial aging. Artificial aging in aluminum alloy type 2024 T3 in this study was conducted in 2 phases that is solution treatment in 500 °C for 1 hour and continued with artificial aging process in 180 °C by holding time 2, 4 and 6 hours. From the conducted research, it was found that there was hardness improvement on aluminum type 2024 T3 in line with the increasing of aging time. The gained microstructure was getting smooth which means the precipitation hardening process was getting perfect.

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On Preparation of Advance Ceramic for Single-edge V-Notch Beam Fracture Toughness Test of ISO/FDIS 23146:2008(E) Standards

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IOP Conference Series: Materials Science and engineering 2020年第1期852卷

作者： Tjokorda Gde Tirta Nindhia Study Program of Mechanical Engineering Department Faculty of Engineering Udayana University

With establishment of fracture toughness test for advance ceramic according ISO/FDIS 23146:2008(E) with the sample test of Single-edge V-Notch Beam/SEVNB, then the researcher related this activity should understand and able to realize how to prepare the sample of advance ceramic in order the requirements of the standard are fulfilled. In contrary with metals and polymers that usually easy to cut as the standard size for testing, the advance ceramics are found much more difficult to prepare since it is very hard and brittles. More even, specifically for fracture toughness test, the level of difficulty is added since the sharp initial crack should be introduced in the edge of the sample. This article introduce method on preparation of advance ceramic for the purpose of fracture toughness test completed with method to introduce the initial sharp V-notch crack which is valid and possible to be measured its length and diameter of the tip that yield valid result of fracture toughness test.

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A model for building and sustaining communities of engineering education research scholars

A model for building and sustaining communities of engineeri...

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113th Annual ASEE Conference and Exposition, 2006

作者： Adams, Robin Allendoerfer, Cheryl Bell, Philip Chen, Helen Fleming, Lorraine Leifer, Larry Maring, Bayta Williams, Dawn Purdue University United States Department of Engineering Education Purdue University United States University of Washington United States Center for the Advancement of Engineering Education University of Washington United States Cognitive Studies in Education University of Washington United States Stanford University United States United States Center for the Advancement Engineering Education Academic Pathways Study Research Team Howard University United States Department of Civil Engineering Howard University United States National Science Foundation HBCU Undergraduate Program United States Department of Mechanical Engineering Design Stanford Center for Design Research United States United States United States Center for the Advancement of Engineering Education Department of Educational Administration and Policy Howard University United States Institute for Scholarship on Engineering Education

Building and sustaining communities of new engineering education researchers is crucial for bringing people into an area of scholarship, supporting them working in this area, providing opportunities for long term professional development within a community of practice, and building capacity in the engineering education research infrastructure. The Institute for Scholarship on engineering Education (ISEE), an element of the NSF-funded Center for the Advancement of engineering Education (CAEE), is designed to build and sustain communities of engineering education scholars who can investigate student learning issues and transform findings into actionable improvements. The Institute has a revolving host structure across three schools - University of Washington, Stanford University, and Howard University. Over three consecutive year-long cycles, ISEE builds and extends a cohort of scholars at host and partner schools. In this paper we explore the question "how do we build capacity in engineering education research?" We pursue this question by examining the ISEE model, the successes and challenges experienced as we near completion of the second of three cycles, and implications for future community building efforts. © American Society for engineering Education, 2006.

关键词： engineering research

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The Utilization of Agave Cantula Roxb as Composite Strength on Fishing Boat Hull

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IOP Conference Series: Materials Science and engineering 2021年第1期1088卷

作者： Karel Tikupadang Musa B. Palungan Atus Buku Hansten Manuhutu Mechanical Engineering Study Program Paulus Christian University of Indonesia

The objective of this study is to analyses the Agave Cantula Roxb tensile and bending strength. The analysis was further done to observe the sustainability utilization the Agave Cantula Roxb fiber as a composite strengthener for fishing boat hulls. The research was carried out at the metallurgy mechanical engineering laboratory, engineering Faculty, Indonesia Paul Christian University, Makassar. The method used is making a specimen with a 0%, 20%, 30%, 40% and 50% fiber composition, while the catalyst composition as a hardener is about 10%. To determine the material mechanical strength, a tensile test was carried out where the specimen dimension was based on the ASTM D3039 international standard. While for the bending test, the specimen dimension was based on the ASTM D790-03. From the test result it is indicated that not all composite specimen composition can be used as ship hulls material. Based on the standard required by the Indonesian Classification Bureau, the composite tensile strength standard (σt) is about 10 kf/mm2 and a bending strength standard (σb) of 15 kgf/mm2. Based on standard required, the composite condition that fulfilled the requirements is the 50% fiber which has a tensile strength of σt = 11,8 kgf/mm2 and a bending stress σb = 25,41 kgf/mm2.

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