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Analysis of Power Generating Speed Bumps Made of Concrete Foam Composite

IOP Conference Series: Materials Science and engineering 2017年第1期180卷

作者： B Syam M Muttaqin D Hastrino A Sebayang W S Basuki M Sabri S Abda Impact and Fracture Research Center Dept. of Mechanical Engineering Faculty of Engineering University of Sumatera Utara (USU Graduate Student MechEngr Study Program USU Undergraduate Student Dept of MechEngr Study USU Dept. of Chemistry Faculty of Science University of Sumatera Utara Graduate student Dept. of Mech. Engr Faculty of Engineering University of Sumatera Utara

This paper discusses the analysis of speed bump made of concrete foam composite which is used to generate electrical power. Speed bumps are designed to decelerate the speed of vehicles before passing through toll gates, public areas, or any other safety purposes. In Indonesia a speed bump should be designed in the accordance with KM Menhub 3 year 1994. In this research, the speed bump was manufactured with dimensions and geometry comply to the regulation mentioned above. Concrete foam composite speed bumps were used due to its light weight and relatively strong to receive vertical forces from the tyres of vehicles passing over the bumps. The reinforcement materials are processed from empty fruit bunch of oil palm. The materials were subjected to various tests to obtain its physical and mechanical properties. To analyze the structure stability of the speed bumps some models were analyzed using a FEM-based numerical softwares. It was obtained that the speed bumps coupled with polymeric composite bar (3 inches in diameter) are significantly reduce the radial stresses. In addition, the speed bumps equipped with polymeric composite casing or steel casing are also suitable for use as part of system components in producing electrical energy.

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Potential production of palm oil-based foaming agent as fire extinguisher of peatlands in Indonesia: Literature review

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IOP Conference Series: Earth and Environmental Science 2017年第1期65卷

作者： P Subekti E Hambali A Suryani P Suryadarma Program Study of Mechanical Engineering Pasir Pengaraian University Regency of Rokan Hulu Riau Indonesia Post Graduate Student Program Study Agricultural Industrial Technology Bogor Agricultural University Bogor Indonesia Department of Agricultural Industrial Technology Faculty of Agricultural Industrial Technology Bogor Agricultural University Bogor Indonesia Surfactant and Bioenergy Research Center Bogor Agricultural University Bogor Indonesia

This study aims to analyze the potential aplication of of palm oil-based foaming agent as peat fires fighter in Indonesia. From literature review, it has been known that the foaming agent able to form foam to extinguish fire, wrap and refrigerate the burning peat. It is necessary to develop the production and application of foaming agent in Indonesia because peat fires occur almost every year that caused smoke haze. Potential raw material for the production of environmental friendly foaming agent as foam extinguishing for peat fires in Indonesia aong other is palm oil due to abundant availability, sustainable, and foam product easily degraded in the environment of the burnt areas. Production of foaming agent as fire-fighting in Indonesia is one alternative to reduce the time to control the fire and smog disaster impact. Application of palm oil as a raw material for fire-fighting is contribute to increase the value added and the development of palm oil downstream industry.

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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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The implementation of constructivism approach for physics learning in vocational high school

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AIP Conference Proceedings 2016年第1期1778卷

作者： Tuwoso 1Study Program of Mechanical Engineering Education Mechanical Engineering Department Faculty of Engineering Universitas Negeri Malang Indonesia

The nowadays Physics learning at vocational high school is still focusing on teacher-centered. Therefore, the learners’ activities are only listening to a lecture from the teacher and take notes. The learning process is supposed to be students-centered, the teacher acts as a facilitator and mediator. The learning process should provide an opportunity for learners to acquire knowledge itself in accordance with the prior knowledge they already had, which is the result of interaction with the environment. Such learning process is in accordance with the constructivist view. The method in this research is quantitative research, the research design pretest-posttest control group design. The research subjects are 30 students for the experimental group and 30 students in the control group. The experimental group in this research is the group that is taught by the constructivist approach (student-centered), while the control group is taught by the teacher - centered approach. The obtained findings have significant differences in post test results of students who are treated as experimental groups and with the control group (p <0.05). The conclusion of this research is the implementation of Physics in vocational learning with constructivist approach proved to be effective and influence the improvement of learning outcome of students in the first semester for the tenth grade students of vocational high school.

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Implementation of project based learning model in mechanical machining skills package of vocational high school

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AIP Conference Proceedings 2016年第1期1778卷

作者： Dwi Agus Sudjimat 1Mechanical Engineering Education Study Program Departemen of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang Indonesia

One model of learning that is most appropriate for vocational school based on standart learning process of curriculum 2013 was the use of project-based learning model. The findings of this study indicate that all of the mechanical machining teachers have implemented the project-based learning model based on their quite comprehensive understanding. Teachers perceive that project-based learning model can improve the hard skills and soft skills of the students. One weakness lies in the project is used, which is produced only by the analysis of the basic competencies of the subjects and does not use projects from industry so that most of the students’ products could not be used, what else is sold.

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Energy Optimization Modeling of Geothermal Power Plant (Case study: Darajat Geothermal Field Unit III)

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IOP Conference Series: Earth and Environmental Science 2016年第1期42卷

作者： R H M Sinaga P S Darmanto Engineering Management Study Program Del Institute of Technology Laguboti Toba Samosir 22381 Indonesia Mechanical Engineering Study Program Bandung Institute of Technology Bandung 40132 Indonesia

Darajat unit III geothermal power plant is developed by PT. Chevron Geothermal Indonesia (CGI). The plant capacity is 121 MW and load 110%. The greatest utilization power is consumed by Hot Well Pump (HWP) and Cooling Tower Fan (CTF). Reducing the utility power can be attempted by utilizing the wet bulb temperature fluctuation. In this study, a modelling process is developed by using engineering Equation Solver (EES) software version *** possibility of energy saving is indicated by Specific Steam Consumption (SSC) net in relation to wet bulb temperature fluctuation from 9°C up to 20.5°C. Result shows that the existing daily operation reaches its optimum condition. The installation of Variable Frequency Drive (VFD) could be applied to optimize both utility power of HWP and CTF. The highest gain is obtained by VFD HWP installation as much as 0.80% when wet bulb temperature 18.5 °C.

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Crystallinity and thermal resistance of microcrystalline cellulose prepared from manau rattan (Calamusmanan)

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AIP Conference Proceedings 2016年第1期1725卷

作者： Raden Reza Rizkiansyah Mardiyati Steven R. Suratman 1Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering InstitutTeknologi Bandung Ganesha 10 Bandung 40132 Indonesia

The objective of this study was to prepare microcrystalline cellulose from Manau rattan (Calamusmanan) and to investigate the influence of concentration of sulfuric acid and hydrolysis time on crystallinity and thermal resistance of the microcrystalline cellulose (MCC). In this research, MCC was extracted through two stages, which is alkalization and acid hydrolysis. Alkalization was prepared by soaking manau rattan powder into sodium hydroxide (NaOH) 17.5wt% at 100°C for 8 hours. Acid hydrolysis was prepared by using sulfuric acid with concentration 0.1 M; 0.3 M; and 0.5 M for 4, 6, 8 and 10 hours. Crystallinity of MCC was measured by XRD, and thermal resistance was characterized by TGA. MCC was successfully extracted from manau rattan. The highest crystallinity of MCC obtained was 72.42% which prepared by acid hydrolysis with concentration 0.5 M for 10 hours. MCC prepared by acid hydrolysis with concentration 0.5 M for 10 hours not only resulted the highest crystallinity but also the best thermal resistance.

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Effects of alkali treatment on the mechanical and thermal properties of Sansevieria trifasciata fiber

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AIP Conference Proceedings 2016年第1期1725卷

作者： Mardiyati Steven Raden Reza Rizkiansyah A. Senoaji R. Suratman 1Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia

In this study, Sansevieria trifasciata fibers were treated by NaOH with concentration 1%,3%, and 5wt% at 100°C for 2 hours. Chesson-Datta methods was used to determine the lignocellulose content of raw sansevieria fibers and to investigate effect of alkali treatment on lignin content of the fiber. mechanical properties and thermal properties of treated and untreated fibers were measured by means of tensile testing machine and thermogravimetric analysis (TGA).The cellulose and lignin contents of raw sansevieria fiber obtained from Chesson-Datta method were 56% and 6% respectively. mechanical testing of fibers showed the increase of tensile strength from 647 MPa for raw fibers to 902 MPa for 5wt% NaOH treated fibers. TGA result showed the alkali treatment increase the thermal resistance of fibers from 288°C for raw fibers to 307°C for 5% NaOH treated fiber. It was found that alkali treatment affect the mechanical properties and thermal properties of sansevieria fibers.

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Aerodynamic study on wing and tail small UAV without runways

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AIP Conference Proceedings 2016年第1期1737卷

作者： Maria F. Soetanto Randy R. Alfan M. R. Dzaldi 1Aerodynamic Laboratory Aeronautical Engineering Study Program-Mechanical Engineering Politeknik Negeri Bandung Bandung-Indonesia 2Aeronautical Engineering Study Program Politeknik Negeri Bandung Bandung-Indonesia Jl. Gegerkalong Hilir-Ds. Ciwaruga Bandung Indonesia

This paper consists of the design and analysis of the aerodynamics of the profiles of wing and tail of a Small Unmanned Aerial Vehicle (UAV). UAV is a remote-controlled aircraft that can carry cameras, sensors and even weapons on an area that needed aerial photography or aerial video [1]. The aim of this small UAV is for used in situations where manned flight is considered too risky or difficult, such as fire fighting or surveillance, while the term ’small means the design of this UAV has to be relatively small and portable so that peoples are able to carry it during their operations [CASR Part 101.240: it is a UAV which is has a launch mass greater than 100 grams but less than 100 kilograms] [2]. Computational Fluid Dynamic (CFD) method was used to analyze the fluid flow characteristics around the aerofoil’s profiles, such as the lift generation for each angle of attack and longitudinal stability caused by vortex generation on trailing edge. Based on the analysis and calculation process, Clark-Y MOD with aspect ratio, AR = 4.28 and taper ratio, λ = 0.65 was chosen as the wing aerofoil and SD 8020 with AR = 4.8 and λ = 0.5 was chosen as the horizontal tail, while SD 8020 with AR = 1.58 and λ = 0.5 was chosen as the vertical tail. The lift and drag forces generated for wing and tail surfaces can be determined from the Fluent 6.3 simulation. Results showed that until angle of attack of 6 degrees, the formation of flow separation is still going on behind the trailing edge, and the stall condition occurs at 14 degrees angle of attack which is characterized by the occurrence of flow separation at leading edge, with a maximum lift coefficient (Cl) obtained = 1.56. The results of flight tests show that this small UAV has successfully maneuvered to fly, such as take off, some acrobatics when cruising and landing smoothly, which means that the calculation and analysis of aerodynamic aerofoil’s profile used on the wing and tail of the Small UAV were able to be validated.

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Numerical investigation of heat transfer and fluid flow characteristic of V-corrugated plate solar air collector with prismatic fin as an extended surface

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AIP Conference Proceedings 2016年第1期1778卷

作者： Mohamad Hakam Djatmiko Ichsani Clarissa Suroso 1Mechanical Engineering Department of Sepuluh Nopember Institute Of Technology Surabaya - Indonesia 2Safety Engineering Study Program of Shipbuilding Polytecnic of Surabaya – Indonesia

As the time goes by, fossil energy consumption is increasing. Absolutely, It will cause the decreasing on fossil energy. Because of that it is essential to look for renewable energy, for example is solar energy. Solar energy can be implicated on solar air collector. Solar air collector consists of absorber plate, ducting channel, cover glass, and blower.A numerical investigation of heat transfer and fluid flow characteristics in v-corrugated plate solar air collector having prismatic fin on the absorber plate is presented in this study. Three-dimensional simulations are conducted using FLUENT 6.3.26 and SST-Kω turbulence model. The computations are performed for different fin dimension with a varying thickness and spacing of fin. Simulations were used to find the optimal thickness of the 3mm, 4mm, and 5mm fin with 0.25ℓ, 0.50 ℓ, and 0.75 ℓ spacing between the obstacle on each thickness variation. The effects of the fin dimension and spacing on pressure drop and pressure difference are obtained and analyzed. As the result, using fin on the plate absorber enhanced the heat transfer. The maximum value of the thermal performance parameter was found in 3 mm fin thickness and 0.50ℓ spacing with ΔP/ΔT 37.0672 compared to solar air collector without fin. Presence of prism fin generate turbulence in the flow that obviously increase the heat transfer, but it also gives effect on the pressure drop along the ducting channel.

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