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All Journal Jurnal Energi Dan Manufaktur Jurnal Pendidikan Teknik Mesin Jurnal Inovator Majamecha J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Otopro Jurnal Pendidikan Teknik Mesin Undiksha Quantum Teknika International Journal of Mechanical Engineering Technologies and Applications (MECHTA) al-fikrah: Jurnal Manajemen Pendidikan Journal of The Indonesian Society of Integrated Chemistry J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin
I Gede Wiratmaja
Universitas Pendidikan Ganesha
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Pembuatan Etanol Generasi Kedua Dengan Memanfaatkan Limbah Rumput Laut Eucheuma Cottonii Sebagai Bahan Baku I Gede Wiratmaja; I Gusti Bagus Wijaya Kusuma; I Nyoman Suprapta Winaya
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (620.897 KB)

Abstract

Dissociation energy of diatomic crisis happened in various states in the existing world cleavage has entered areal serious step and concerns so that must soon is searched its the problem solving method, including Indonesia. Source ofpotential feedstock which its the availability is abundance, economy-priced, has not many exploited by people and containssimple sugar sewer structures which can be turned into ethanol is lignocellulosic material which in a few last decade,becomes one of interesting research object to know potency from material - lignocellulose material in producing ethanol.One of water territory commodity of a real Indonesia potency to be developed is sea grass Eucheuma cottonii and rest ofyield cottonii which is not is exploited able to exploited returns to to become one of making feedstock of substitution ethanolof feedstock which during the time is applied like distance, cassava and sugar cane. In this research, approach gone throughin the form of assaying method of direct is field. Assaying is done by comparing various raffle ratio cottonii with yeast atfermentation process with various fermentation time and various delignification to look for comparison of ethanol puritygrade, ethanol volume and fermentation speed by using measuring instrument which so called vinometer.Result fromresearch done with method is upper obtained result as follows : At delignification NaOH 15% and with comparison (1:0,006) for raffle cottonii and yeast is obtained by purity grade, best ethanol volume and fermentation speed. Where highestethanol grade got from treatment biologically that is equal to 15,5% and in physicist equal to 14,8% on day 6 offermentation. So do with ethanol volume yielded is higher where maximum volume capable to be yielded is 245 ml atbiological treatment and 234 ml at physical treatment on day 9of fermentation. Meanwhile highest fermentation speedcapable to be yielded is 0,058 kg/day at physical treatment, and 0,063 kg/day at biological treatment on day 3offermentation so that as a whole ethanol purity grade, ethanol volume and fermentation speed yielded with treatmentbiologically gives higher level result if it is compared to ethanol grade yielded from treatment in physicist.
Analisa Unjuk Kerja Motor Bensin Akibat Pemakaian Biogasoline I Gede Wiratmaja
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (566.702 KB)

Abstract

Renewable energy has become a major issue and debate in recent years. This is not apart from the depletion of energyreserves do not renewable in the bowels of the earth. Particularly oil, which is estimated to 20 years from now will be exhaustedso that the solution should be found to obtain adequate alternative energy. One way is to use what is biogasoline alternative fuelmixture of gasoline and alcohol with a specific ratio, it is due to biofuels (alcohol) can not stand alone as a pure substitute forconventional fuels, especially gasoline. This Biogasoline tested on a conventional engine to find work and performance comparedwith performance with the use of gasoline enginesIn a study conducted to find out is by direct testing methods in the field. Testing is done by comparing the variation of theratio of gasoline and alcohol mixture with varying spin machine, using a tool called the Universal dynamometer Module .Results from research conducted by the above method obtained the following results: Biogasoline (90:10) to producepower and greater torque compared to other fuels tested in this study, but still more wasteful in terms of fuel consumption.
Pengaruh Variasi Insulator Saluran Chilled Water Terhadap Performansi Prototype Mini Water Chiller Buddhi Satya Utama; I Nyoman Pasek Nugraha; I Gede Wiratmaja
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 3, No 1 (2021): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v3i1.12264

Abstract

The high heat transfer rate from the environment to the chilled water pipe will affect the performance of the mini water chiller prototype, so it is necessary to insulate the chilled water pipe using the right insulator to optimize the performance of the mini water chiller prototype. Therefore, this study aims to determine the effect of the chilled water pipe insulator variations: nitrile rubber expanded and polyurethane foam on the optimal temperature and cooling rate of the mini water chiller prototype cabin. The method used in this study is an experimental method with a variation of the insulator as independent variables and the optimal temperature also cooling rate of the mini water chiller prototype cabin as the dependent variables. The testing process was carried out 20 times repetition of data collection on each variation using a stopwatch, thermo gun, thermostat, ampere pliers, a bulb, and a water heating element as a tool in research. In addition, it expanded nitrile rubber and polyurethane foam spray as research material. The results obtained from this study showed that the average optimal temperature achievement of the mini water chiller prototype with polyurethane foam insulator was 11.242◦C, and with the nitrile rubber expanded insulator was 11.250◦C. Otherwise, the average cooling rate of the mini water chiller prototype cabin with polyurethane foam insulator variation was 0.001421◦C, while in the variation of nitrile rubber expanded it was 0.001032◦C, which indicates that there is an effect of chilled water pipe insulator variations on the performance of the mini water chiller prototype.
REDESAIN BODI SEPEDA MOTOR LISTRIK BABY GANESHA 1.0 GENERASI II DAN PENGARUHNYA TERHADAP PENURUNAN COEFFICIENT OF DRAG Muhammad Khoirul Makhbub; I Gede Wiratmaja; Kadek Rihendra Dantes
Otopro Vol 17 No 2 Mei 2022
Publisher : Jurusan Teknik Mesin Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/otopro.v17n2.p62-68

Abstract

The aerodynamic aspect is an aspect that really considers the force generated by the fluid flow which has an impact on performance and energy consumption while driving. The purpose of this research is to modify the standard design of the baby ganesha 1.0 generation II electric motorcycle so that it gets a design with a smaller coefficient of drag. The need for fluid flow simulation analysis To determine the coefficient of drag, one way of simulation analysis is to use solidwork, solidworks is known to have the speed and accuracy required for a successful analysis. The conceptual research paradigm R2D2 (Reflective, Recursive, Design and Development) is used to conduct research and development. Development (R&D). After the fluid flow analysis process was carried out, it was found that the modified body design of 2 baby Ganesha 1.0 generation II electric motorcycles obtained a Coeficient Of Drag of 0.0372 lower than the standard body design of Baby Ganesha 1.0 generation II electric motorcycles which only had a coefficient value. of drag is 0.0433. Through expert judgment, the modified design of 2 Baby Ganesha 1.0 generation II electric motorcycles received a percentage with a value of 82% with good qualifications.
Studi Literatur: Pengembangan Biogasoline dengan Pemanfaatan Arak Bali Sebagai Bahan Bakar Kendaraan Ramah Lingkungan Komang Purnayasa; Ngurah Putu Putra Adnyana; I Gede Wiratmaja
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 3, No 2 (2022): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v3i2.13402

Abstract

The use of biogasoline from Bali wine as a fuel additive in gasoline from fossil energy sources gets a lot of severe problems, especially to make biogasoline products as an alternative fuel that is able to stand alone as the main fuel in Indonesia in the future. This article is in the making based on the results of literature studies by conducting an analysis process on various sources of pre-existing articles. This literature study is processed in various ways such as reviewing the results of previous research on the use of Balinese wine as one of the energy-friendly fossil fuel substitutes. From this literature study obtained the advantages of an engine working umjuk, namely the use of biogasoline from Balinese wine to variations in compression ratio the greater the acceleration produced is also increasing which makes the combustion of the table better, and also the use of fuel becomes more efficient. The use of biogasoline fuel additives from Bali wine against exhaust emissions in the form of carbon monoxide (CO) and carbon dioxide (CO₂) gases decreased. Then in terms of raw materials, it is feared that there is competition between the availability of food raw materials (the manufacture of brown sugar and ant sugar). One solution so that ethanol from Balinese wine in pure biogasoline that can be used as fuel is with adsorbed type treatment and immersion time and interaction are very influential on the quality of biogasoline concentration and percentage value increase in biogasoline concentration when in the dehydration process.
Analisis Penambahan Zat Aditif pada Bio Solar terhadap Opasitas Kendaraan Bermesin Diesel Hafid Ramadhan; Edi Elisa; I Gede Wiratmaja
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 3, No 2 (2022): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v3i2.13531

Abstract

This study aims to find out the effect of mixing biodiesel and additives with various kinds of mixtures on the exhaust gas opacity of a 4-stroke diesel engine. In this study, two variations of the ratio of the mixture of bio-diesel and additives were used, namely bio-diesel with a mixture ratio of 2.5%: 97.5% and a mixture ratio of 1.25%: 98.75% for additives and bio-diesel. The method used in this study uses an experimental method where the data collection process is carried out through observation and documentation. Data collection was carried out 5 times a repetition using the Opacity Smoke Meter tool. From the results of the study, the variation of the mixture of 2.5%: 97.5% resulted in the lowest average exhaust gas opacity value, where there was a decrease in exhaust gas opacity by 20.8% compared to standard conditions (without the addition of additives). From the results of this study, it can be concluded that there is an impact of adding additives to biodiesel on exhaust gas opacity where the more additives added to biodiesel will further reduce exhaust gas opacity in vehicles with diesel engines.
Analisis Kekuatan Impact Komposit Polyester Berpenguat Kombinasi Serat Batang Bambu dan Serat Daun Pandan Bali I Gede Made Aditya Tresnajaya; I Nyoman Pasek Nugraha; I Gede Wiratmaja
J-Proteksion Vol 7, No 2 (2023): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v7i2.9331

Abstract

Penelitian ini adalah untuk mengetahui kekuatan impact dari masing-masing tipe fraksi volume spesimen. Dengan perbandingan 24% komposit polyester dan 16% serat alami sebagai reinforcement dengan fraksi volume kombinasi serat 24% bambu: 16% pandan Bali, 20% bambu: 20% pandan Bali, dan 16% bambu: 24% pandan Bali serta untuk mengetahui struktur mikro spesimen uji impact dari masing-masing spesimen. Metode ini menggunakan eksperimen dengan variabel terikat kekuatan impact, struktur mikro, dan veriabel bebas fraksi volume 24% bambu: 16% pandan, 20% bambu: 20% pandan Bali, dan 16% bambu: 24% pandan Bali. Hasil pengujian impact yang dilakukan menggunakan alat uji charpy mendapatkan nilai rata-rata untuk spesimen 24% bambu: 16% pandan Bali 4659,99 J/m2, 20% bambu: 20% pandan Bali 3905,71 J/m2,dan 16% bambu: 24% pandan Bali 5391,52 J/m2. Dari hasil data tersebut dapat disimpulkan bahwa kombinasi serat dapat berpengaruh pada kekuatan impact. Untuk spesimen yang menggunakan serat 16% bambu: 24% pandan Bali memiliki kekuatan impact yang lebih besar dengan serat yang lainnya. Secara mikroskopik pola patahan menunjukkan terjadinya pola patahan getas (brittle) pada spesimen 20% bambu: 20% pandan Bali dan mengalami kondisi fiber pull out. Untuk kondisi patahan sikat terjadi pada spesimen uji mikro serat 24% bambu: 16% pandan Bali. Sementara pada spesimen serat 16% bambu: 24% pandan Bali hanya memiliki model patahan getas (Brittle Fracture) dan tidak mengalami fiber pull out.
STATIC STRESS AND DEFORMATION ANALYSIS OF GANESHA PORTABLE ELECTRIC SCOOTER (E-GASPOL) FRAME USING SOLIDWORKS SOFTWARE Komang Purnayasa; I Gede Wiratmaja; Nyoman Arya Wigraha
Jurnal Pendidikan Teknik Mesin Vol 23, No 1 (2023): Jurnal Pendidikan Teknik Mesin
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jptm.v23i1.47518

Abstract

This study aims to determine and minimise static stress and increase the safety factor on the Electric Ganesha Scooter Portable (E-GASPOL) vehicle frame. The type of development research used is the R2D2 type (Reflective,  Recursive, Design and Development). The data analysis technique used is the finite element method, this method can solve static problems. From the data of the static stress analysis results on the four designs, the results of the modified vehicle frame design 3 have the best value, namely obtaining a maximum stress value of 1,255 x N/m conditions without rider load, this result has a decrease of 58.55% from the standard design and with a rider load of 7,699x N/m, this result has a decrease of 58.56% from the standard design. The maximum displacement value was 1,453 x mm in the condition without rider load, this result decreased by 77.718% from the standard design and with rider load it was 8,791 x mm, this result decreased by 78.10% from the standard design. In this study, the smaller the stress and displacement values, the better the frame strength, so it can be concluded that the modified frame is better and stronger than the standard frame.
Augmented reality: Analisis Pengembangan Media Pembelajaran Kimia untuk Meningkatkan Keterampilan 4C Mahasiswa Edi Elisa; IGede Wiratmaja
Journal of The Indonesian Society of Integrated Chemistry Vol. 11 No. 2 (2019): Journal of The Indonesian Society of Integrated Chemistry
Publisher : Pendidikan Kimia FKIP Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jisic.v11i2.8124

Abstract

[ Augmented reality: Analysis of Development the Chemical Instructional Media to Improve 4c Skill of Students ] Penelitian ini bertujuan untuk mengetahui proses pengembangan media pembelajaran kimia berbasis augmented reality dengan harapan dapat digunakan untuk meningkat keterampilan 4C mahasiswa. Jenis penelitian termasuk kedalam penelitian dan pengembangan (R&D) dengan menggunakan model pengembangan ADDIE yang terdiri dari lima tahap. Pada artikel ini pembahasan akan difokuskan pada tahap analisis. Fokus kegiatan pada tahap analisis yaitu menganalisa keterampilan yang dibutuhkan di abad 21, menganalisa proses pembelajaran, menganalisa berbagai kemungkinan media pembelajaran yang dapat digunakan dan mengambil suatu keputusan. Instrumen yang digunakan pada tahap ini yaitu lembar observasi, tes essay, angket dan daftar pertanyaan wawancara. Subjek uji coba adalah program studi Pendidikan Teknik Mesin Fakultas Teknik dan Kejuruan Universitas Pendidikan Ganesha, sampel merupakan mahasiswa yang mengontrak matakuliah kimia teknik. Berdasarkan hasil analisis kebutuhan dan analisis awal dan akhir, maka ditetapkan media yang paling sesuai dan akan dikembangkan yaitu augmented reality yang didukung dengan seperangkat kartu pembelajaran. Produk yang dihasilkan harus didesain untuk dapat meningkatkan keterampilan 4C mahasiswa.
Pengembangan Laboratorium Virtual Kimia Teknik untuk Meningkatkan Keterampilan Berpikir Kritis dan Proses Sains Mahasiswa Edi Elisa; I Gede Wiratmaja; I Nyoman Pasek Nugraha; Kadek Rihendra Dantes
Journal of The Indonesian Society of Integrated Chemistry Vol. 12 No. 2 (2020): Journal of The Indonesian Society of Integrated Chemistry
Publisher : Pendidikan Kimia FKIP Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jisic.v12i2.11243

Abstract

[Development of The Virtual Laboratory of Engineering Chemistry to Increase Students' Critical Thinking and Science Processes Skills] TTujuan penelitian ini yaitu untuk mengembangkan media pembelajaran laboratorium virtual kimia yang didesain untuk dapat meningkatkan keterampilan berpikir kritis dan keterampilan proses sains mahasiswa secara mandiri dimasa pandemi covid-19. Pendekatan yang digunakan yaitu penelitian dan pengembangan dengan model ADDIE. Validasi ahli materi dan media digunakan untuk menilai kelayakan media. Uji kepraktisan melalui uji kelompok kecil dan kelompok besar. Data dikumpulkan melalui pengamatan langsung, wawancara, observasi, dan angket.  Data dianalisis menggunakan statistik deskriptif. Hasil penelitian menunjukkan bahwa laboratorium virtual sangat layak dan praktis untuk digunakan pada pembelajaran kimia teknik serta untuk meningkatkan keterampilan berpikir kritis dan proses sains mahasiswa secara mandiri.
Co-Authors Alfian, Handi Ardika Yasa, Gede Dyo Ariantika, Kadek Arifudin, Andi Arnawa, I Komang Gede Artha, Edy Agus Juny Arya Wiguna, I putu A’an Adji Ahmad Sya’bani Batistuta, Andreas Buddhi Satya Utama Budiastawan, Ngurah Putu Darmawan, Gede Dharmawan, I Made jati Elisa, Edi Gede Widayana Gede Widayana Hafid Ramadhan I Gede Ari Saputra I Gede Made Aditya Tresnajaya I Gusti Bagus Wijaya Kusuma I Nyoman Pasek Nugraha I Nyoman Suprapta Winaya I Putu Arya Wiguna I Wayan Wismantarayasa Kadek Rihendra Dantes Komang Adhi Indrawan Saputra Komang Purnayasa Komang Purnayasa Kusumayani, Ni Made Novia Made Agus Suardana Pinatih Mahayoga, I Kadek Alit Mardhotillah, Bunga Muhammad Khoirul Makhbub Ngurah Putu Putra Adnyana Nyoman Arya Wigraha Pranata, I Wayan Dwi Eka Purnayasa, Komang Putra, Anak Agung Gede Windhu Gandhi Ryan Pratama Putra, Ryan Pratama Saputra, Komang Adhi Indrawan suta ari pradnyana Wayan Wismantarayasa, I Widiadnyana, I Wayan Bayu Wiguna, I Putu Arya Wijaya, Hardian Putra Wismantarayasa, I Wayan Zurweni Zurweni