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All Journal Rotasi Rekayasa Mesin LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Turbo : Jurnal Program Studi Teknik Mesin JMM (Jurnal Masyarakat Mandiri) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Jurnal Fisika : Fisika Sains dan Aplikasinya ARMATUR : Artikel Teknik Mesin dan Manufaktur Jurnal Pengabdian Vokasi Jurnal Teknologi Jurnal Ilmiah Fakultas Sains dan Teknik Universitas Nusa Cendana Jurnal Lembaga Pengabdian Kepada Masyarakat Undana
Defmit B.N. Riwu
Program Studi Teknik Mesin, Fakultas Sains Dan Teknik Universitas Nusa Cendana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Analisis Pengaruh Penggunaan Arang Aktif Sebagai Adsorben Terhadap Temperatur Nyala Api Gas Bio Dari Feses Sapi Riwu, Defmit B.N.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 9 No 02 (2022): Oktober 2022
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v9i02.9390

Abstract

Permasalahan kelangkaan energi merupakan persoalan yang terus berkembang dan diperbincangkan didunia tentang kebutuhan akan sumber energi yang terbarukan yang bersifat ramah lingkungan. Biogas merupakan salah satu energi alternatif sebagai pengganti bahan bakar minyak. Biogas dalam penelitian ini berasal dari feses sapi. Penelitian ini bertujuan untuk mengetahui pengaruh proses pemurnian biogas yang menggunakan arang aktif sebagai adsorben terhadap temperatur nyala api biogas dari feses sapi. Beberapa teknologi pemurnian biogas telah dikembangkan dengan berbagai macam metode, dalam penelitian ini menggunakan teknologi adsorben. Salah satu adsorben yang mudah diperoleh dan ekonomis adalah arang aktif. Pada penelitian ini, dilakukan pemurnian biogas menggunakan arang aktif yang berukuran 60 mesh dengan kapasitas volume arang aktif 1,5 liter dan debit alir gas 1580 l/s yang memvarisikan 3 tabung adsorben dengan ukuran tabung yang berbeda-beda. Hasil penelitian menunjukkan bahwa pemurnian biogas pada tabung III memiliki temperatur yang tinggi dan baik, tinggi nyala api, dan warna nyala api dengan perbedaan pada tabung I, tabung II dan tanpa pemurnian yaitu temperatur nyala api sebesar 701ᵒC, tinggi nyala api 66,4735 mm.
Eksperimen Rumah Pengering Ikan Sarden Model Ultra Violet (UV) Solar Dryer Kombinasi dengan Sistem Solar Air Heater Melalui Variasi Kecepatan Udara Keluar Punuf, Rolandi; Riwu, Defmit B.N.; Koehuan, Verdy A.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 10 No 01 (2023): April 2023
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v10i01.11986

Abstract

The technique for preserving a new product is by using a drying technique. The development and utilization of solar energy must continue to be developed with several technologies including the Solar Air Heater. The research method used was an experimental method on Ultra-Violet solar dryer drying houses for drying sardines with additional absorption of solar radiation heat using a solar air heater system. This configuration works by drawing air from the building envelope or from the outside environment and passing it through a collector where the air is warmed by conduction and convection in the absorber. The analysis of this study is regarding the velocity of the airflow coming out of the drying chamber, namely 1.0 m/s, 1.5 m/s and 1.8 m/s, while the airflow velocity in the solar panel (exhaust fan) is 3.5 m/s (constant). The results of the study show that the addition of heat through the solar air heater panel can speed up the drying process in the drying chamber. The temperature difference in the solar panel increases the heat absorbed through the hot air flow which also increases the efficiency of the solar panel. The highest efficiency of the drying house is 48.05 % occurring at the outlet air flow rate of 1.8 m/s. The temperature difference in the drying chamber and the increased ambient air tends to increase the efficiency of the drying chamber where in this study the highest value of 48.05% was obtained at a speed of 1.8 m/s
Analisis Kualitas Briket Berbahan Dasar Cangkang Kemiri fallo, Gideon; Riwu, Defmit B.N.; Koehuan, Verdy A.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14285

Abstract

The increasing use of fossil fuels, which is aware of the issue of global warming and environmental damage due to pollution, has increased efforts to develop renewable energy sources. Briquettes are one of the alternative sources of renewable energy that have been developed this decade. This research is part of an effort to develop briquettes, especially hazelnut shell briquettes, as an alternative fuel. Making hazelnut shell charcoal briquettes is carried out by carbonization process using the pyrolysis method. Making starch adhesive (tapioca starch) with a ratio of charcoal powder and starch adhesive (tapioca flour) of 90:10%. Furthermore, the candlenut shell briquettes were tested for proximation tests (ash content, moisture content and calorific value). Candlenut shell briquettes can be used as an alternative fuel because they have a high calorific value of 6061kcal/kg. The hazelnut shell briquettes basically comply with the Indonesian National Standard SNI 01-6235-2000 and the Emission Standards of the Regulation of the State Minister for the Environment Number 05 of 2006 regarding the threshold for exhaust emissions of old motorized vehicles.
Pengaruh Variasi Tekanan dan Jumlah Lubang Injektor Terhadap Besar Sudut Semprotan Bahan Bakar Bioetanol Naitboho, Asriel; Riwu, Defmit B.N.; Dwinanto, Matheus M.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 01 (2024): April 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i01.14287

Abstract

This research aims to determine the effect of variations in pressure and number of injector holes on the spraying angle of bioethanol fuel. Bioethanol fuel has become a promising alternative in reducing dependence on fossil fuels. However, proper spray characteristics are required to achieve efficient combustion and low emissions. In this research, experiments were carried out using injectors with varying numbers of holes, namely 6 holes and 12 holes and varying pressures, namely 30 Psi, 40 Psi and 50 Psi. The spray angle of bioethanol fuel is measured and analyzed using appropriate measuring equipment. The research results show that variations in pressure and number of injector holes have a significant influence on the spraying angle of bioethanol fuel. In this case, increasing the pressure tends to increase the spray angle, while increasing the number of holes tends to reduce the spray angle. This understanding is important in designing an efficient and optimal bioethanol fuel injection system. This research contributes to the development of bioethanol fuel technology and provides insight into the influence of pressure and the number of holes in the injector on spray characteristics
Pengaruh Lama Waktu Pemanasan Terhadap Kadar Alkohol Moke Dengan Sistem Destilasi Sederhana Raju, Efremsus Sugianto; Riwu, Defmit B.N.; Pah, Jack C.A.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 02 (2024): Oktober 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i02.16587

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh lama waktu pemanasan terhadap kadar alkohol moke dengan sistem destilasi sederhana. Bahan baku destilasi menggunakan nira siwalan ( Borassus flabellifer linn ). Pengujian alat destilasi pada penelitian menggunakan suhu destilasi 78°C dengan variasi lama waktu pemanasan yaitu 2 jam 3 jam dan 4 jam. Metode yang digunakan dalam penelitian ini adalah metode eksperimen. Hasil penelitian menunjukkan bahwa waktu pemanasan yang lama dapat berpengaruh terhadap kadar alkohol yang diperoleh. Semakin lama waktu pemanasan kadar alkohol yang diperoleh semakin rendah. Kadar alkohol moke yang diperoleh pada penelitian ini dengan variasi lama waktu pemanasan yaitu 30% dengan lama waktu pemanasan 2 jam, 30% dengan lama waktu pemanasan 3 jam, dan 28% dengan lama waktu pemanasan 4 jam.
Optimasi Kompor Dengan Variasi Bahan Bakar Sonbaifeto, Dodi Alfredo; Riwu, Defmit B.N.; Tobe, Adi Y.
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 11 No 02 (2024): Oktober 2024
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v11i02.17862

Abstract

Dalam peningkatan kebutuhan energi dan kesadaran akan pelestarian lingkungan, penggunaan bahan bakar yang ramah lingkungan dan efisien menjadi penting. Penelitian ini bertujuan untuk mengembangkan kompor yang dapat menggunakan berbagai jenis bahan bakar sebagai solusi alternatif. Fokusnya adalah pada pengujian konsumsi bahan bakar dan temperatur api dari tiga jenis bahan bakar: minyak tanah, Biodiesel B30, dan minyak jelantah. Hasil pengujian menunjukkan bahwa konsumsi bahan bakar pada ketinggian penempatan tabung bahan bakar 200 cm, konsumsi bahan bakar pada bahan bakar minyak tanah sebesar 0,035 ml/s, Biodiesel B30 sebesar 0,04ml/s, dan minyak jelantah sebesar 0,03ml/s, sedangkan pada ketinggian penempatan tabung bahan bakar 160 cm, konsumsi bahan bakar pada bahan bakar minyak tanah sebesar 0,031ml/s, Biodiesel B30 sebesar 0,039ml/s, minyak jelantah sebesar 0,027ml/s, dan Temperatur api di ketinggian menaruh tabung bahan bakar di 200 cm, pada bahan bakar minyak tanah sebesar 1049°C, Biodiesel B30 sebesar 971°C, dan minyak jelantah sebesar 805°C, sedangkan, , sedangkan pada ketinggian penempatan tabung bahan bakar di 160 cm, temperatur api pada bahan bakar minyak tanah sebesar 996°C, pada Biodiesel B30 sebesar 788°C, dan pada minyak jelantah sebesar 518°C.
The MINI REVIEW: PREPARASI BIOETANOL BERBASIS MAKROALGA Solle, Clara Indriani; Riwu, Defmit B.N.; Neolaka, Yantus
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 01 (2025): April 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i01.18077

Abstract

In the face of serious impacts of greenhouse gas emissions and dependence on fossil fuels, biofuels especially bioethanol are emerging as a promising alternative. This article highlights the potential of macroalgae as bioethanol feedstock due to its advantages of abundant availability, rapid growth and high carbohydrate content. The bioethanol production process from macroalgae includes pretreatment, hydrolysis, fermentation and distillation stages. Pre treatment aims to increase the accessibility of cellulose, hydrolysis converts cellulose into glucose which is then fermented into bioethanol by microorganisms such as Saccharomyces cerevisiae. Macroalgae shows very high bioethanol yield compared to other feedstocks making it a sustainable option that does not compete with food production. Bioethanol from macroalgae can be used as transportation fuel, feedstock for chemical industry as well as fuel additive. The use of bioethanol contributes to the reduction of dependence on fossil fuels and supports a more sustainable industry.
Akibat peningkatan tekanan gesek terhadap kekuatan tarik sambungan pada proses pengelasan gesek continuous drive AA6061- baja karbon sedang Pah, Jack Carol Adolf; Riwu, Defmit B. N.; Maliwemu, Erich U.K.; Tobe, Adi Yermia; Bunganaen, Wenseslaus; Mangesa, Daud P.
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 1 (2023): Jurnal TURBO
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i1.2296

Abstract

The objective of this research was to get the effect of friction pressure on the tensile strength of the joining of aluminum alloy AA6061 and carbon steel, with continuous drive friction welding process. Variations of friction pressure of this research were 24 MPa, 32 MPa, and 40 MPa. In this study, a friction time 9 seconds was used. Other friction welding variables were, forging pressure 79 MPa, forging time 60 seconds, and friction rotation speed 1600 rpm. The independent variable was the ultimate tensile strength of the welded joint. The results showed that the increase in the tensile strength of the joint was not linear with the increase of frictional pressure. The rate of the increase in the tensile strength of the connection, will decrease after the frictional pressure passes through 32 MPa. When the rate of increase in the tensile strength of the joint begins to decrease, the joint will become more brittle. The maximum tensile strength of the joint in this study was 167.421 MPa at a frictional pressure of 40 MPa.Rasakan keseruan bermain di om88 dengan peluang menang yang lebih besar. Nikmati pengalaman bermain yang seru, aman, dan penuh tantangan. Segera coba dan raih kemenangan besarmu!
Pelatihan Pembuatan Jahe dan Kunyit Instan Pada Masyarakat Kelurahan Lasiana-Kota Kupang Pah, Jack Carol Adolf; Abolladaka, Jacob; Riwu, Defmit B. N.
Jurnal Pengabdian Kepada Masyarakat Undana Vol 15 No 2 (2021): DESEMBER 2021
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jpkmlppm.v15i2.5743

Abstract

Abstract This activity is intended to provide understanding and skills to the community in Lasiana Subdistrict, at Kupang City, on how to use house yard land to provide added value for family needs. This activity focuses on two types of plants, ginger and turmeric. How to grow a good ginger and turmeric, and maintain it. Giving added value to these two types of plants by processing them into ready-to-eat (instant) ginger and turmeric. The method used in this activity is interactive lectures and training (practice). Entrepreneurship and marketing of home industry products is also provided as additional knowledge. The participants are able to have skills in processing ginger and turmeric, into instant ginger and turmeric, which can be seen by their ability to make these products. The interest and knowledge of the participants in entrepreneurship must be followed up on the next activity. Keywords: ginger, turmeric, home yard use, added value, home industry Abstrak Kegiatan ini dimaksudkan untuk memberi pemahaman dan juga memberi ketrampilan pada masyarakat Kelurahan Lasiana di Kota Kupang, tentang bagaimana memanfaatkan lahan pekarangan untuk memberi nilai tambah bagi pemenuhan kebutuhan keluarga. Pada Kegiatan ini lebih di fokuskan pada dua jenis tanaman yaitu jahe dan kunyit. Bagaimana cara menanam jahe dan kunyit yang baik, dan memeliharanya. Pemberian nilai tambah pada kedua jenis tanaman ini, dengan mengolahnya menjadi jahe dan kunyit instan siap saji. Metode yang digunakan dalam kegiatan ini adalah ceramah interaktif dan pelatihan (praktek) pembuatannya. Tambahan pengetahuan mengenai kewirausahaan dan pemasaran produk industri rumah tangga, juga diberikan sebagai materi tambahan dalam kegiatan ini. Peserta kegiatan mampu menguasai dengan baik ketrampilan dalam mengolah jahe dan kunyit, menjadi jahe dan kunyit instan. Hal ini terlihat dengan mampunya mereka dalam membuat produk ini. Ketertarikan dan pengetahuan peserta kegiatan ini pada kewirausahaan merupakan suatu yang mengembirakan dan harus ditindaklanjuti pada kegiatan berikutnya. Kata Kunci: Jahe, kunyit, pemanfaatan pekarangan, nilai tambah, industri rumah tangga
PELATIHAN MANAJEMEN KESEHATAN DAN KESELAMATAN KERJA (K3) DI PUSKESMAS OESAPA Tobe, Adi Yermia; Selan, Rima Nindia; Bale, Jefri S; Mangesa, Daud Pulo; Sanusi, Arifin; Riwu, Defmit B.N.; Pah, Jack C.A.
Jurnal Pengabdian Vokasi Vol 4, No 1 (2025): Juni 2025
Publisher : Sekolah Vokasi Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpv.2025.24948

Abstract

Community Health Centers are the front guard in providing health services to the community, where the government has designated them as First Level Health Facilities (Level 1 Health Facilities) which are the reference for obtaining health insurance at the next level (Hospital).  Therefore, community health centers must provide the best services and complete education, so that the goals of public health can be achieved.   Occupational Health and Safety is an important element in protecting ourselves both from the service provider side (employees/staff) and from the service recipient side (patients/community).  Occupational Health and Safety itself consists of several elements that must be understood, including: Occupational Diseases, Personal Protective Equipment, Psychology and Ergonomics, Comfort (Noise and Vibration), Dangers (Mechanical and Electrical) and ultimately can be intertwined in the Safety Management System and Occupational Health.  All of these things have not been fully realized and applied in everyday life, even in health facilities. With this activity, it is hoped that the implementation of good Occupational Health and Safety will automatically increase the health figures of the community itself. 
Co-Authors Abolladaka, Jacob Adi Yermia Tobe Ashsidiq, Muhammad Hasby Baitanu, Rivanto Baria, Metrisno Ben V. Tarigan Ben Vasco Tarigan Dantje A. T. Sina Daud P. Mangesa Daud P. Mangesa Daud P. Mangesa Dominggus Godlief Heryson Adoe Eflinda Milo Erich Maliwemu, Erich fallo, Gideon Ginting, Almido H, Gusnawati Gusnawati Husein, Fuaddin B. I.N.G. Wardana Jack C. A. Pah Jack C.A Pah Jack C.A. Pah Jack Carol Adolf Pah Jack Carol Adolf Pah Jack Pah Jahirwan Ut Jasron Jefri Semuel Bale Kyven G. Hoke Liba Lilis Yuliati Mangesa, Daud P. Mangesa, Daud Pulo Margaretha Kewa Unarajan Marten E. Manane Matheos Marc Tuka Penu Matheus M. Dwinanto Melvani E. D. Tana Muhamad Jafri Muhammad Julfikar Nahak, Jufrianus Aven Naitboho, Asriel Neolaka, Yantus Pah, Jack C. A. Pah, Jack C.A. Pah, Jack Carol Adolf Priyono Priyono Punuf, Rolandi Raju, Efremsus Sugianto Reinaldy Weo Rima Nindia Selan Robin Diyener Takain Rohi, Jemssy Ronald Samy Y. Doo Sanusi, Arifin Seprianus Rudolf Membubu Siagian, Saut Ronny Tuah Simplisius Fridolin Akoit Solle, Clara Indriani Sonbaifeto, Dodi Alfredo Suprianto Siagian Talo, Piter Tarigan, Ben V. Tobe, Adi Yermia Verdy A Koehuan Verdy A. Koehuan Vinsen Yuminto Bifel Wagimin Wagimin Wenseslaus Bunganaen Yoffial D. Banani Yohanes V. Gere