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All Journal Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur Majalah Ilmiah Teknologi Elektro Jurnal Teknosains Rekayasa Mesin Nomosleca ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Journal of Mechanical Engineering Science and Technology Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan EPI International Journal of Engineering Mechanical Engineering for Society and Industry Majalah Ilmiah Teknologi Elektro
I Gusti Ngurah Nitya Santhiarsa
Program Studi Teknik Mesin Fakultas Teknik Universitas Udayana
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Transportation

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PENGUJIAN ALAT KONVERSI SAMPAH MENJADI ETANOL I Kade Agus Sugiarta; I Gusti Bagus Wijaya Kusuma; I Gusti Ngurah Nitya Santhiarsa
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 3 No 1 (2017)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sampah Organik merupakan sampah yang dapat di kelola sebagai bahan baku pembuatan bioetanol. Untuk menghasilkan bioetanol diperlukan sebuah alat yang bisa mengkonversi sampah organik menjadi etanol. Batasan yang ditentukan dalam pembuatan alat konversi sampah menjadi etanol diantaranya fungsi alat untuk mengkonversi sampah menjadi etanol minimal dengan volume 250 ml per 10 kg sampah organik, divariasikan dengan temperatur 20-400 C, divariasikan dengan tiga macam campuran ragi dan difermentasikan selama 3 hari. Setelah alat dinyatakan dapat bekerja sesuai indikator pengujian, maka dilanjutkan dengan proses pengamatan produksi etanol. Prosedur pengujian yang diamati adalah dari segi jumlah volume etanol dan jumlah nilai kadar alkohol yang dihasilkan. Dari hasil perhitungan perencanaan alat didapatkan dimensi poros dengan diameter 12 mm, tangki sampah berdiameter 600 mm dengan panjang 800 mm serta terdapat heater, menggunakan gearbox 1:50 dan menggunakan motor listrik 0,5 Hp. Dari hasil pengujian pengamatan jumlah produksi etanol dan kadar alkoholnya dapat simpulkan bahwa jumlah volume produksi etanol dan nilai kadar alkoholnya sangat berpengaruh pada variasi campuran ragi, putaran tangki, dan temperatur yang digunakan. Hal itu dikarenakan adanya faktor-faktor yang mendukung kondisi kamir untuk memfermentasikan produk menjadi etanol. Pada temperatur 200 C, campuran ragi 1 serta putaran 5 rpm menunjukkan jumlah produksi etanol dan nilai kadar alkohol paling tinggi yaitu 656 ml etanol dengan kadar alkohol 16 % Organic waste is a waste that can be managed as a raw material for making bioethanol. To produce bioethanol required a tool that can convert organic waste into ethanol. The limits specified in the manufacture of waste conversion tools into ethanol include a tool function for converting waste into minimal ethanol with a volume of 250 ml per 10 kg of organic waste, varied with temperatures of 20-400 C, varied with three different yeast mixtures and fermented for 3 days. Once the tool is declared to work according to the test indicator, then proceed with the observation process of ethanol production. The test procedure observed was in terms of the amount of ethanol volume and the amount of alcohol content produced. From the calculation of tool planning got the dimension of the shaft with a diameter of 12 mm, garbage tank diameter 600 mm with a length of 800 mm and there is a heater, using 1:50 gearbox and using 0.5 hp electric motor. From the results of the observation test the amount of ethanol production and the alcohol content can be concluded that the amount of ethanol production volume and its alcohol content value greatly influence the variation of yeast mix, tank rotation, and temperature used. This is due to the factors that support the condition of kamir to ferment the product into ethanol. At a temperature of 200 C, the yeast 1 and 5-rpm mixture showed the highest amount of ethanol production and alcohol content of 656 ml of ethanol with 16% alcohol content.
Optimasi Pengaruh Parameter Terhadap Sifat Mekanis pada Sambungan Similar Baja Tahan Karat AISI 304 I Putu Agus Tina; I Nyoman Budiarsa; I G usti Ngurah Nitya Santhiarsa
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 8 No 1 (2022)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2022.v08.i01.p08

Abstract

Kekuatan sambungan dan sifat las titik dipengaruhi oleh beberapa faktor seperti ketebalan pelat, ukuran strip, waktu pengelasan, tegangan dan beban yang diberikan selama proses las. Sambungan dalam hal ketebalan dan ukuran diameter kerucut dalam pembuatan nugget sangat penting saat menghubungkan panel saat merakitbodi sebagai bagian yang menentukan kelayakan dan keselamatan transportasi. Periksa sambungannya. Secara umum, banyak penelitian telah dilakukan pada pengelasan titik tentukan parameter yang dapat mempengaruhi hasil las. Pengujian tarikdan teknik pengelasan titik uji digunakan untuk menentukan kekuatan sambunganlembaran baja tahan karat. Optimasi Pengaruh Parameter Terhadap Sifat Mekanis Pada Sambungan Similar Baja Tahan Karat AISI 304. dimana pada spesimen 1.26V 4mm tegangan maksimum 119 MPa, spesimen 1.26V 5mm tegangan maksimum 76 MPa, spesimen 1.26V 6mm tegangan maksimum 131 MPa, spesimen 1.37V 4mm tegangan maksimum 215 MPa, spesimen 1.37V 5mm tegangan maksimum 122 MPa, spesimen 1.37V 6mm tegangan maksimum 71 MPa, spesimen 1.48V 4mm tegangan maksimum 104 MPa, spesimen 1.48V 5mm tegangan maksimum 76 MPa, spesimen 1.48V 6mm tegangan maksimum 49 MPa. Jadi dari hasil ke 9 pengujian dengan menggunakan voltase dan taper berbeda nilai tegangan maksimum yang tertinggi yaitu pada spesimen (137V,4mm) Hal ini karena sampel ujisampai benar-benar mengalami ekstraksi atau perpindahan yang maksimal dibandingkan sampel lainnya. The strength of the joint and the properties of the spot weld are affected by several factors such as plate thickness, strip size, welding time, stresses and loads applied during the welding process. The connection in terms of thickness and size of the cone diameter in the manufacture of nuggets is very important when connecting panels when assembling the body as a part that determines the feasibility and safety of transportation. Check the connection. In general, a lot of research has been carried out on point welding to determine the parameters that can affect the welding results. Tensile testing and test point welding techniques are used to determine the joint strength of stainless steel sheets. Optimizing the Effect of Parameters on Mechanical Properties at Similar Connections of AISI 304 Stainless Steel. Where in the specimen 1.26V 4mm maximum stress is 119 MPa, specimen 1.26V 5mm maximum stress is 76 MPa, specimen 1.26V 6mm maximum stress is 131 MPa, specimen 1.37V 4mm maximum stress 215 MPa, specimen 1.37V 5mm maximum voltage 122 MPa, specimen 1.37V 6mm maximum voltage 71 MPa, specimen 1.48V 4mm maximum voltage 104 MPa, specimen 1.48V 5mm maximum voltage 76 MPa, specimen 1.48V 6mm maximum voltage 49 MPa. So from the results of the 9 tests using different voltages and tapers, the highest maximum voltage value is in the specimen (137V,4mm). This is because the test sample actually experiences maximum extraction or displacement compared to other samples.
PEMBANGKITAN TEGANGAN MENGGUNAKAN KARBON AKTIF TEMPURUNG KELAPA DENGAN ELEKTROLIT AIR Tista, Si Putu Gede Gunawan; Santhiarsa, I Gusti Ngurah Nitya; Astawa, Ketut; Tenaya, I Gusti Ngurah Putu; Negara, Komang Metty Trisna
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1520

Abstract

The generation of electrical energy from fossil fuels is currently running low, besides that it can cause global warming due to gas emissions such as carbon dioxide. Besides that, the development of small portable equipment such as watches, handphones, and cameras, requires batteries with small power. Therefore, environmentally friendly materials on a small scale are needed to generate electricity, one of which is coconut shell-activated carbon. The purpose of this research is to generate a voltage from a model using activated coconut shell carbon with a water-electrolyte. The model consists of a counter electrode-electrode counter. The counter electrodes are varied, namely aluminum, zinc, and copper. The electrode used is coconut shell-activated carbon, while the electrolyte is distilled water. The electrolyte is injected into the model between the electrode and the counter electrode and then given the heat. When the electrolyte is injected into the model, electrostatic forces occur between the functional groups, the pores on the surface of the activated carbon, the counter electrode, and the water-electrolyte, resulting in the release of electrons. The results show that the voltage generated by heating to a temperature rise of ΔT = 54 ͦC is 0.795 volts for aluminum counter electrodes, while zinc reaches 0.597 volts and copper reaches 0.034 volts. While the average thermal sensitivity of the resulting voltage (dV/dT) for aluminum is 47.85707 mV/ ͦ C, while zinc is 39.15949 mV/ ͦC, and copper is 1.72348 mV/ ͦC.
Effect of Variations in Pyrolysis Reactor With Glass Wool Equipped and Without Glass Wool on the Weight of the Oil Produced Santhiarsa, IGN Nitya
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 5, No 2 (2021)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v5i22021p089

Abstract

Currently, plastic waste is a very serious threat because plastic waste pollution can harm all living things around and also harm the environment. The increasing volume of plastic waste is due to the lack of processing technology, so that the volume of plastic waste is increasing day by day. Plastic is a material that is difficult to decompose because it is non-biodegradable. One application of plastic waste processing technology offered in this study is to use the pyrolysis principle. Pyrolysis is a method of converting plastic into fuel oil through a thermal decomposition process without the use of oxygen. The pyrolysis process used with a variety of reactors equipped with glass wool and reactor variations without glass wool. The purpose of this study was to compare the yield of pyrolysis oil with a variety of reactors equipped with glass wool and reactors without glass wool. The plastic used is OPP (oriented polypropylene), with a constant reactor heating temperature of 200° C. The pyrolysis process is carried out for 1 hour each test, and the condenser cooling temperature is 28° C. Based on the results of the research, the reactor variation with glass wool got the highest oil weight of 175 grf, while the reactor variation without glass wool got the lowest oil weight of 17 grf. With a variety of reactors equipped with glass wool, the heat generated is more concentrated into the reactor core, resulting in higher oil weight and a more efficient pyrolysis process.
Mechanical Characterization of NaOH-Treated Agel Fiber-Cotton Composites Santhiarsa, IGN Nitya; Kusuma, I Gusti Bagus Wijaya; Negara, I Gede Artha
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 7, No 2 (2023)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v7i22023p214

Abstract

Composites comprising two or more distinct materials are fabricated to enhance the mechanical properties of the constituent materials. A common approach for generating composites is vacuum infusion. This technique enables the infusion of two materials utilizing a vacuum. In the field of composite science, textile composites have emerged as an important new development. Agel rope, derived from twisting agel fibers, exhibits inferior bending strength and elongation compared to ropes fabricated from synthetic fibers. Moreover, agel rope is susceptible to bacterial decay. This study aims to characterize the mechanical properties of textile composites comprising woven agel rope subjected to NaOH treatment. Specimens in the longitudinal (warp) shows maximal load bearing capacity, as determined by experimental results. Samples treated with 5% NaOH tolerated peak loads of 51.12 N prior to failure, with an associated deflection of 3.18%. Specimens in the transverse (weft) of the woven cotton demonstrated maximum load of 40.75 N at 0.9% deflection. The maximum stress was 25.67 MPa. Similar to agel rope, NaOH treatment removes adhering contaminants from cotton fibers, thereby enhancing their strength. However, NaOH concentrations exceeding 7.5% extract cellulose, damaging the fiber ultrastructure.
Integrated microcontroller mq sensors for monitoring biogas: Advancements in methane and hydrogen sulfide detection Negara, I Gede Artha; Anakottapary, Daud Simon; Widiantara, Ida Bagus Gde; Midiani, Luh Putu Ike; Nindhia, Tjokorda Gde Tirta; Santhiarsa, I Gusti Ngurah Nitya
Jurnal Teknosains Vol 13, No 2 (2024): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.91936

Abstract

Recent technological advances in microcontroller systems enable novel biogas monitoring capabilities. This study investigates microcontroller-based quantification of methane and hydrogen sulfide concentrations in biogas derived from anaerobic digestion. Anaerobic digesters were fed either 100% cow dung substrates or a 50:50 mixture of cow dung with municipal solid waste (MSW). Methane levels were monitored using an MQ-4 sensor, hydrogen sulfide via an MQ-136 sensor, and temperature with a K-type thermocouple, all integrated with an ATmega 2560 microcontroller system. The 100% cow dung digester produced biogas with maximum methane concentrations of 3488 ppm at 21 days, indicating improved methane production compared to the 50:50 mixture of cow dung with MSW. Hydrogen sulfide reached 195 ppm and 192 ppm for the 100% cow dung and mixed digesters. Mesophilic temperature conditions were maintained throughout the digestion process. Real-time quantification of biogas composition demonstrates the capabilities of microcontroller-based anaerobic digester monitoring to provide precise methane and hydrogen sulfide measurements.
KAJIAN ENERGI SURYA UNTUK PEMBANGKIT TENAGA LISTRIK I Gusti Ngurah Nitya Santhiarsa; I Gusti Bagus Wijaya Kusuma
Jurnal Teknologi Elektro Vol 4 No 1 (2005): (January - June) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

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Abstract

Solar cell is an energy conversion that changed solar energy into electrical energy. The energy produced by solar cell is the most energy which safe to the environment, but the area covered of its installation will be very wide. Beside that, solar cell most depends on the intensity of sun radiation, for where its continuity is questionable and become another problem. In order to make solar energy as an electrical power generator, the weakness of the problem should be eliminated. This paper will explain how solar energy could be used as an alternative energy in order to anticipate the electrical crisis in Bali.
Impact of Natural Polymer Proportions on the Fire-Retardant Properties of Bioplastics Santhiarsa, I Gusti Ngurah Nitya; Dwidiani, Ni Made; Tenaya, I Gusti Ngurah Putu; Negara, I Gede Artha
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 2 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i22024p434

Abstract

This research investigates the influence of varying proportions of natural polymers on the fire-retardant properties of bioplastic. Tapioca starch (Manihot esculenta) and corn starch (Zea mays) were selected as the bioplastic materials, with different weight fractions employed in the analysis. These materials, as naturally occurring polymers, are biodegradable and serve as promising components in the development of bioplastics. Fire resistance testing was conducted in accordance with ASTM D635-03, utilizing weight ratios of tapioca to corn starch at 70:30, 60:40, and 50:50. The results included photographic documentation of each specimen alongside the corresponding outcomes from the fire resistance tests. These images provide insight into the physical condition of the specimens prior to testing, emphasizing any notable morphological features that may affect their fire resistance properties. The optimal burning rate was observed in the bioplastic with a 50:50 weight fraction ratio of tapioca starch to corn starch, which exhibited a combustion rate of 8.420 mm/s. Additionally, the bioplastic with the highest weight loss rate, recorded at 0.0346 g/s, was also composed of a 50:50 weight fraction of the two starches. The observed increase was 2.36% relative to the 60:40 weight fraction and 13% relative to the 70:30 weight fraction. This increased weight loss rate can be attributed to the higher corn starch content, which is characterized by inherent flammability due to its structural composition.
Pb Adsorption of Coffee Peel Derived Activated Carbon by Varying KOH Concentration Dwidiani, Ni Made; Wardana, I Nyoman Gede; Suardana, Ngakan Gede Putu; Santhiarsa, I Gusti Ngurah Nitya; Sibarani, Relius Zakaria
EPI International Journal of Engineering Vol 7 No 1 (2024): Volume 7 Number 1, February 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.022024.01

Abstract

Turning biomass waste into added value product is crucial as it is not only beneficial to the environment but also to the economy. Coffee peel is a waste that has excellent potential to produce activated carbon. Activated carbon is carbon that has gone through an activation process and has a large surface area and higher adsorption rate. The high need for activated carbon in overcoming waste problems makes it useful to reduce its environmental impact. Activated carbon is widely used in water filtration including heavy metal Pb and Cd. The aim of this research is to study the impact of KOH concentration on Pb adsorption of activated carbon derived from coffee peel. KOH activator could enhance the performance of the activated carbon. The KOH activator concentration is varied to obtain the best-surface structure in activated carbon. The KOH concentration is 2,3 and 4 molars. Each specimen will undergo the same carbon activation process by maintaining the carbonization and drying temperature. Then at the activation stage, variations of KOH concentration will be mixed with the activated carbon and soaked for 24 hours with a weight ratio of KOH to charcoal of 1,5 to 1. The result shown that fixed carbon of 2,3,4 molar KOH concentration are 45.99%, 58.22%, 42.99% respectively, while Pb adsorption are 96.56%, 98.34% and 96.45%. In addition, the adsorption rate of activated carbon is proportional to the concentration level of the KOH solution. However, there is a limit on adsorption concentration, so there is a significant decrease when KOH exceeds the saturation point. Based on this research, Pb adsorption of coffee peel derived activated carbon is quite significant even though the amount of fixed carbon relatively low. Keywords: Activated carbon; coffee peel; KOH; Pb
The analysis of semiconducting charateristic of rice husk-based carbon nanomaterial bio-activated by pineapple peel juice Dwidiani, Ni Made; Suardana, Ngakan Putu Gede; Wardana, I Nyoman Gede; Nugroho, Willy Satrio; Puja, I Gusti Ketut; Septiadi, Wayan Nata; Santhiarsa, I Gusti Ngurah Nitya; Tista, Si Putu Gede Gunawan
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12733

Abstract

This study investigates the synthesis and characterization of semiconducting materials derived from rice husk bio-activated by pineapple peel juice, presenting an eco-friendly and sustainable approach. The organic photo-active semiconducting material from rice husk ash (RHA) is synthesized. RHA was activated by immersion in the pineapple juice solution. Distinct structural disparities among RHA, Sunken Carbon nanomaterial (SCNM), and Floating Carbon Nanomaterial (FCNM) materials are revealed through SEM imaging, showcasing the tailored nature of each material. The SEM images also indicate the role of bromelain from the pineapple juice to provide defects on the RHA carbon surface. The crack on the nano particles on the surface of SCNM and FCNM were formed due to the bromelain electrostatic interaction with the surface. Elemental analysis indicates a higher probability of CuO and Si presence in SCNM, suggesting its potential for semiconductor extraction. The Cu to Si ratio implies photoactivity, confirmed by UV-Vis characterization showing absorption peaks in the UV region. FTIR analysis highlights enhanced polar interactions in SCNM and FCNM, attributed to the activation process involving bromelain in pineapple juice. The photoelectric effect testing shows FCNM and SCNM generates more electrical current as exposed to light which. The current was generated due to the electron transport phenomenon of CuO and Si content triggered by photons. The study provides insights into the materials' molecular structures and potential applications in sensors, energy devices, and semiconductor-related technologies, leveraging the unique properties of bio-derived nanomaterials for practical implementation.
Co-Authors Achmad Assad Sonief Andoyo Rifky Widighda Benatyar - CI Putri Kusuma K Daud Simon Anakottapary Dewa Ngakan Ketut Putra Negara Dwidiani, Ni Made Eko Marsyahyo I Gusti Agung Alit Suryawati I Gusti Bagus Wijaya Kusuma I Gusti Ketut Puja I Gusti Ngurah Priambadi I Gusti Ngurah Putu Tenaya I Kade Agus Sugiarta I Ketut Adi Sugita I Ketut Suarsana I Made Parwata I Nengah Suarnadwipa I Nyoman Budiarsa . I Nyoman Gede Wardana I Putu Agus Tina I Wayan Bandem Adnyana I Wayan Lega Suprapto JAYA, KOMANG ALIT KUMARA Kelvin Ryanta Tanato Ketut Astawa Komang Alit Kumara Jaya Luh Putu Ike Midiani M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Negara, I Gede Artha Negara, Komang Metty Trisna Ni Made Dwidiani NPG Suardana Putu Wijaya Sunu Si Putu Gede Gunawan Tista Sibarani, Relius Zakaria Suardana, Ngakan Gede Putu Suprapto, I Wayan Lega Tjokorda Gde Tirta Nindhia Wayan Nata Septiadi Widiantara, Ida Bagus Gde Willy Satrio Nugroho