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Thermal design of 5 kg capacity coffee bean dryer simulator using Geothermal energy

IOP Conference Series: Earth and Environmental Science 2019年第1期254卷

作者： J Hendrarsakti M R Firmansyah Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Geothermal Study Program Institut Teknologi Bandung Jl. Ganesha 10 Bandung Indonesia

A coffee bean dryer simulator that would be able to fully simulate the whole process of coffee bean drying using heat recovered from geothermal energy source has been thermally designed. This simulator is planned to educate people living near the geothermal resources or power plants about the direct use of geothermal energy, especially in coffe drying. The maximum capacity of this simulator is 5 kilogram of fresh coffee bean that is dried using hot air at 45°C and mass flow rate of 0,23 kg/s. The duration of drying is about 3000 seconds which should be adequate to represent the drying process. The heat exchanger proposed for this thesis is a compact heat exchanger with staggered pipe arangement. The total number of pipes is 10 pipes at 36 cm in length and 65 flat plate alluminium fins measured at 0,6m x 0,16m x 0,005m. The fin efficiency value and the overall surface efficiency value are 72% and 73% respectively.

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Micro Hydro Electric Power Plant (MHEP) Prototype A study Of The Effect Of Blade Numbers Toward Turbine Rotational Velocity

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Journal of Physics: Conference Series 2019年第4期1198卷

作者： Ibnu Asrafi M. Yerizam Sairul Effendi Agung Mataram Renewable Energy Study Program Applied Sciences Master Program Politeknik Negeri Sriwijaya Jalan Srijaya Negara Bukit Besar Palembang Engineering Department Politeknik Negeri Sriwijaya Mechanical Engineering Department Politeknik Negeri Sriwijaya Palembang Mechanical Engineering Department Engineering Facult Sriwijaya University Sumatera Selatan Indonesia

Micro hydro electric power plant (MEPP) prototype is a small scale power plant (less than 100 kW) that utilizes height difference and water discharge per second. Prototype consists of a water pump, where capacity of 41 liter per minute serving as turbine driving force channelled through a nozzle, with a 40 liter water reservoir, and the water flow rate controller is a gate valve. The results show that at blade counts of 4,8,12, and 16, and with water discharge at 40 l/s, 35 l/s, 30l/s, and 25 l/s, with nozzle shooting angle of 50 °, the turbine rotational velocities are 310 rpm, 639 rpm, 655.5 rpm, and 691.3 rpm respectively. Furthermore, at water discharge of 35 l/s, the velocities are 293.3 rpm, 375,3 rpm, 412.7 rpm, 446.2 rpm, and at water discharge of 30 l/s, they are 240.3 Rpm, 395.0 rpm, 430.5 rpm, 445.2 Rpm. Moreover, at water discharge 25 of l/s, the speeds are 285.5 rpm, 330.5 rpm, 426.0 rpm, 431.1 rpm. It is concluded that the higher the water discharge rate, the greater the number of rotation, and it is also concluded that shooting angle has a significant effects on pelton turbine rotation and power.

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The effect of fiber volume fraction on tensile and impact properties of eleusine indica grass reinforced polypropylene bio composite

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

作者： I P Lokantara N P G Suardana I W Surata I N S Winaya Doctoral Study Program of Engineering Science Faculty of Engineering Udayana University Kampus Sudirman Denpasar-Bali Indonesia Mechanical Engineering Department of Udayana University Street of Bukit Jimbaran Badung Bali Indonesia

The purpose of this research was to investigate the tensile strength and impact strength of eleusine indica grass fiber-reinforced polypropylene recycle composite. In this study, the fiber was treated with alkali at 5% NaOH for 2 hours. The eleusine indica grass fiber cut with a length of 3 cm and the matrix used recycle polypropylene. In this research, the volume fraction of eleusine indica grass fiber varied by 20%, 25%, and 30% respectively. The composite molded with a hot press at temperature 200°C with a holding time for 2 hours. Tensile test used ASTM D3039 and impact test used ASTM D256. The highest tensile and impact strength results on fiber volume fraction 30%.

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Renewable energy education framework for prospective physics teachers

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AIP Conference Proceedings 2022年第1期2468卷

作者： Dindin Nasrudin Agus Setiawan Dadi Rusdiana Liliasari 1Science Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No.229 Bandung Indonesia 2Physics Education Study Program UIN Sunan Gunung Djati Bandung Jl. AH. Nasution No. 105 Bandung West Java Indonesia 3Department of Mechanical Engineering Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudhi No.229 Bandung Indonesia 4Departement of Physics Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudi No. 229 Bandung Indonesia 5Departement of Chemistry Education Universitas Pendidikan Indonesia Jl. Dr. Setiabudi No. 229 Bandung Indonesia

Teachers play an important role in spreading energy literacy to students at all level of education. Teacher education must be able to provide learning related to renewable energy education. This study aims to describe the framework of renewable energy education for prospective physics teachers. The research method used is Qualitative Document Analysis (QDA), followed up by the Focus Group Discussion (FGD) method. The results show (1) The development of energy education programs at the university level must support the achievement of graduate profiles (2) There are several physics issues or topics at the high school level that are relevant to renewable energy, including climate change, environmentally friendly technology, global warming, and alternative energy (3) There are several global and national policies on renewable energy development that can be accommodated in the program. Renewable energy education framework for prospective teachers must consider four main points: content, context, and learning outcomes (multiple literacy and skills), which are focused on strengthening the profile of graduates. This study recommends the translation of this framework into a more operational and scalable program.

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The investigation of influence ammonia concentration variations to the performance of a pump less ammonia-water absorption refrigeration system with water flooding evaporator

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AIP Conference Proceedings 2019年第1期2062卷

作者： Hendra Wijaksana I. N. S. Winaya Made Sucipta Ainul. Ghurri 1)Doctoral Study Program in Engineering Science Udayana University Kampus Jendral Sudriran Denpasar Bali-Indonesia 2)Mechanical Engineering Department Engineering Faculty Udayana University Kampus Bukit Jimbaran Denpasar Bali-Indonesia

An experimental investigation of the influences ammonia concentration variation to the performances of pump less ammonia-aqua absorption refrigeration system with water flooding evaporator is described. The heat generated in generator and refrigerating effect in evaporator, cooling capacity, coefficients of performance (COP) are investigated. The objective of this study is to investigate the characteristic and influences of the ammonia concentration variation to the performance of pump less absorption refrigeration system with water flooding evaporator as a refrigeration load.. In this research, the generator temperature has been setting constant in 80°C using electric heater, the ammonia concentration in 500 ml solution would be varied in 18%, 27%, 37%, 47%, and 59%. It is concluded that heat generated in generator and refrigerating effect in evaporator decrease with increasing ammonia concentration, while the cooling capacity and COP would increase with increasing ammonia concentration. As a result, it is found that increasing the ammonia concentration would effect on increasing of cooling capacity and COP. The highest the ammonia concentration, the highest cooling capacity and COP would be resulted. The highest cooling capacity and COP resulted respectively are 0.7180 kW and 0.829 at 59% ammonia concentration.

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Designing of Android Based Learning (Mobile Learning) for Multidiscipline Students

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Journal of Physics: Conference Series 2020年第2期1569卷

作者： SC Wibawa IKD Nuryana IGPE Prismana DA Dermawan A Manyu A Frianto E Rahmadyanti DE Susetyaningsih N Shofiyah RM Yusron Mashudi Informatics Engineering Department Universitas Negeri Surabaya Indonesia 60231 Economics Department Universitas Negeri Surabaya Indonesia 60231 Civil Engineering Department Universitas Negeri Surabaya Indonesia 60231 Center of Information Technology Development Universitas Negeri Surabaya Indonesia Culinary Department Vocational State High School of 8 Surabaya Indonesia 60231 Department of Mechanical Engineering University of Trunojoyo Madura Indonesia Islamic Education Study Program The State Islamic Institute of Jember (IAIN) Indonesia 68136

A breakthrough in the multimedia field is needed by creating varied learning strategies to attract students' interest in learning. The purpose of this study is to create learning media M-Learning to support the learning process in Vocational High School and to know the level of prevalence M-Learning as a medium of learning. The research method using Research and Development which has eight stages: 1) Identification of Research Needs, 2) Purpose Formulation, 3) Formulation of material items, 4) Formulation of success tools, 5) Media manuscript formulation, 6) Tests or product trials, 7) Revisions, 8) Manuscripts are ready to be produced. This media is developed using Android Studio. The result of this research is a dynamic Android-based application that is run online as a supporter of learning. The results of validator assessment and student response can be obtained from the media expert value at 65% in the sense of valid, acquiring a low score due to a lot of revision of the application. According to the material experts, the media obtains the value of 85% which means valid, and a validity score of 94.7% is obtained from students' responses that mean valid. The conclusion shows that validator assessments of learning media can be used as supporting self-study, especially for multidiscipline students.

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Comparison of tensile strength of continues-core method and 4 strand modifies method of after healing of repaired Kessler rabbit's Achilles tendon injury

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IOP Conference Series: Materials Science and engineering 2019年第1期622卷

作者： P S Caksana IKS Kawiyana I W S Dusak T G T Nindhia Resident of Studies Program of Orthopaedic Surgery and Traumatology Medical Faculty of Udayana University Denpasar Indonesia Study Program of Orthopaedic Surgery and Traumatology Medical Faculty of Udayana University Denpasar Indonesia Departmen of Mechanical Engineering Engineering faculty Udayana University Jimbaran Bali Indonesia

Tendon injury causes significant morbidity during the productive age, and the number is increase in recent decades. Tensile strength is the most important factor in tendon function of style, and the results of repair should be able to withstand large current style of early mobilization. This research was an experimental research design with the post-test only control group design with the subject of the rabbit. A total of 18 research subjects who meet the requirements of the study inclusion were randomly divided into treatment and control groups. Control group was a group of rabbits that were repaired with 4 strand modified Kessler technique after Achilles tendon cut sharply. While the treatment group were a group of rabbits that were repaired with continuous-cores technique. The ratio of collagen I/III in rabbit Achilles tendon repair with the technique of continuous-cores are smaller compared to the control group with value of P <0.05. Also Showed statistical analysis tensile strength of rabbit Achilles tendon repair with the technique of continuous-core is greater than the control group at P <0.05.

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The development of virtual laboratory on fluid materials

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Journal of Physics: Conference Series 2019年第5期1280卷

作者： E D Jannati A Setiawan P Siahaan C Rochman D Susanti Y Samantha Mechanical Engineering Study Program Majalengka University Majalengka Indonesia Department of Mechanical Engineering Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education Universitas Pendidikan Indonesia Bandung Indonesia Department of Physics Education UIN Sunan Gunung Djati Bandung Indonesia Department of Informatics Engineering Majalengka University Majalengka Indonesia

This study aims to study the development of laboratory learning media on the concept of fluids. The method used in this study is the research and development (R & D) method of implementation up to step 7, namely: (1) literature study, (2) needs analysis, (3) design of virtual lab learning media, (4) development of lab learning media virtual, (5) validation, (6) product testing, (7) product revision. Virtual laboratory learning media, have gone through a phase validation test by two material experts and one media expert who showed that laboratory learning media on fluid materials are feasible to be applied in learning. the results of sponsored pretest and posttest for students showed a significant increase. Recommended to be applied in a virtual learning laboratory is suitable to be applied in the Faculty of engineering, Majalengka University.

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Soil organic matter in various land uses and management, and its accuracy measurement using near infrared technology

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IOP Conference Series: Materials Science and engineering 2020年第3期830卷

作者： B H Kusumo A Purwanto H Idris S Sukartono L E Susilowati B Bustan Department of Soil Science Faculty of Agriculture University of Mataram JL. Majapahit 62 Mataram Lombok NTB Indonesia Postgraduate Studies University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia Department of Mechanical and Biosystem Engineering IPB University Indonesia Forestry Study Program Faculty of Agriculture University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia

The aim of this study is to investigate the soil organic matter (SOM) status in various land uses and management in Kayangan Sub-District, North Lombok, and its accuracy measurement using near infrared spectroscopy (NIRS). A total of 100 soil samples (0-10 cm depth) were collected from several land uses and management (rain-fed areas, irrigated areas, areas planted 1-3 times with seasonal crops, areas planted with 1-3 perennial plants) in the study area, which were dried, ground and sieved, then analyzed using Walkley and Black method and scanned using near infrared spectroscopy (NIRS). Partial least square regression (PLSR) was used to create SOM prediction models. The results showed that the SOM content varied from very low to moderate with most of them were low. The content of SOM was significantly higher in the irrigated areas compared to that of in the rain-fed areas, and also higher in the areas planted with seasonal crops 3 times a year compared to the areas planted 1-2 times a year. SOM content was higher in areas planted with 2-3 types of perennial plants, compared to with 1 type of perennial plant. NIRS technology was moderately accurate in measuring SOM, which can be used to monitor spatially changes in SOM.

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The influence of shooting conditions during shot peening of stainless steel on surface roughness

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IOP Conference Series: Materials Science and engineering 2020年第1期885卷

作者： M. Iqbal Mukhsen Rusdi Nur M. Alif AF Yusuf Christo Rakka Mechanical Engineering Department Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia Center for Materials and Manufacturing Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia Student of Manufacturing Engineering Study Program Politeknik Negeri Ujung Pandang Jl. Perintis Kemerdekaan Km. 10 Makassar 90245 South Sulawesi Indonesia

Stainless steel AISI 316L is a suitable material used for orthopedic purposes. In order to improve the hardness of stainless steel, the heat-treatment process cannot be done, but with a shot peening process. This study aims to determine the roughness of the workpiece surface and investigate the effect of shooting conditions (i.e., angle and time) on the surface roughness during shot peening of Stainless steel AISI 316L. The shooting parameters used are 2, 4, and 6 minute for the duration, and angle of 0°, 15°, 30° and 45°. The ball material is a type of steel with 0.6mm in diameter. The experimental results presented that the increased shooting time will result in lower surface roughness, and vice versa. Therefore, it can be concluded that the use of varying shooting conditions will greatly affect the quality of the surface produced but needs to be compared with other responses, namely hardness.

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