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All Journal Jurnal Teknik Mesin Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur Jurnal Teknosains Rekayasa Mesin Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Advances in Tropical Biodiversity and Environmental Sciences Jurnal Pendidikan Teknik Mesin Undiksha Bahasa dan Seni: Jurnal Bahasa, Sastra, Seni, dan Pengajarannya Makara Human Behavior Studies in Asia Logic : Jurnal Rancang Bangun Dan Teknologi
Tjokorda Gde Tirta Nindhia
Program Studi Teknik Mesin, Fakultas Teknik, Universitas Udayana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Veterinary

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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.
The Role of Aluminium Nitride as Reinforcement Material for Phase Change Materials (PCMS): A Review on Synthesis, Characterization and Applications in Thermal Energy Storage Wiryanta, I Kadek Ervan Hadi; Nindhia, Tjokorda Gde Tirta; Septiadi, Wayan Nata; Joni, I Made
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.61-71

Abstract

The improvement of thermal energy storage and management has become a significant focus in various industrial applications, including EV battery thermal management, solar energy storage, and high-power electronics. Phase Change Materials (PCM) are widely used for thermal energy storage due to their capacity to absorb and release latent heat. However, organic-based PCMs like paraffin have limited heat conductivity (~0.2 W/mK), limiting their efficiency. This research investigates the potential of Aluminum Nitride (AlN) as a reinforcing material to improve the thermal conductivity and stability of PCM composites. AlN has strong thermal conductivity (~300 W/mK), chemical stability, and oxidation resistance, making it a promising material for increasing PCM thermal performance. Several synthesis methods, including Carbothermal Reduction Nitridation (CRN), sol-gel, hydrothermal, and thermal plasma procedures, have been investigated to produce AlN nanoparticles with appropriate characteristics for integrating into PCM matrices. Furthermore, multiple dispersion strategies, including ultrasonication, surface functionalization, and surfactant-assisted dispersion, are studied to ensure uniform distribution and prevent sedimentation. The use of surfactants like Sodium Dodecyl Sulfate (SDS) and Sodium Stearoyl Lactylate (SSL) further improves dispersion and stability, preventing phase separation and maintaining long-term efficiency. In applications such as EV battery thermal management, AlN-enhanced PCMs demonstrate superior heat dissipation, reducing battery peak temperatures by 19.4% compared to conventional air-cooled systems. Further research is recommended to explore hybrid nanocomposites, optimize AlN particle size and morphology, and develop advanced dispersion techniques to maximize the efficiency of PCM-AlN composites.
Proses Produksi Mobil Taksi Baru dan Mobil Taksi Bekas Menjadi Kendaraan Pribadi: Production Process of New and Used Taxi Cars to Become Personal Vehicles Andhika, Rizki; Nindhia, Tjokorda Gde Tirta
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.84065

Abstract

Taxis are one of the modes of public transportation that are often found in big cities. This study will discuss the production process of new taxis and used taxis until they become cars that are ready to be used as private vehicles by the general public. New taxis will be produced according to taxi standards set by the relevant company. Meanwhile, used taxis are cars that have been operating for 5 years as taxis, then restored to become private vehicles. The production process of new taxis includes various steps from planning to quality control, which aims to ensure that the taxis produced have high quality and a luxurious appearance. Meanwhile, the production process of used taxis requires detailed and thorough checking and processes from the time the car arrives at the production site until production is completed. Through these two processes, in-depth insights are obtained on how to maintain the performance and quality of cars, both new and used, so that they are always optimal.
Pengaruh Metode Fabrikasi terhadap Kekuatan Tarik Komposit Serat Cordyline Australis: The Effect Of Fabrication Method On The Tensile Strength Of Cordyline Australis Fiber Composites Ida Bagus Putu Purwadnyana; Tjokorda Gde Tirta Nindhia
Jurnal Pendidikan Teknik Mesin Undiksha Vol. 13 No. 2 (2025)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jptm.v13i2.102758

Abstract

This study aims to investigate the effect of fabrication methods on the tensile strength of epoxy composites reinforced with untreated Cordyline australis fibers. Two fabrication methods were compared: closed hand lay-up and vacuum chamber. The fiber weight fractions used were 1%, 2%, and 5%. Tensile tests were conducted according to ASTM D638, and morphological characteristics were examined through surface and fracture micrograph analysis. The results show that the hand lay-up method consistently produced higher tensile strength compared to the vacuum method across all fiber fractions. The highest tensile strength was achieved at 2% fiber fraction using the hand lay-up method, reaching 26.91 MPa, while the vacuum method only reached 21.11 MPa. At 5% fiber content, the vacuum method experienced a significant drop in tensile strength to 12.34 MPa, indicating its ineffectiveness at higher fiber loadings without treatment. Micrographic analysis revealed that the vacuum method tended to produce voids and resin-poor areas around the fibers. These findings confirm that fabrication method has a significant influence on the mechanical performance of the composite, and that the hand lay-up method is more suitable for natural fiber-based composites without additional treatments.
Co-Authors A. S. Ferdinand Anak Agung Istri Agung Sri Komaladewi Andhika, Rizki Anton S Ferdinand Ferdinand D. N. K. P. Negara D.N.K.P Negara D.N.K.P. Negara D.N.K.P. Negara Daud Simon Anakottapary David Lie Dewa Ngakan Ketut Putra Negara Dewa Putra Negara Dewa I Gusti Agung Kade Suriadi I Gusti Komang Dwijana I Gusti Ngurah Nitya Santhiarsa I Ketut Adi Atmika I Made Joni I Made Widiyarta I Made Widiyarta Made I Nengah Suarnadwipa I Putu Ari Astawa I Putu Gede Artana I Putu Putra Widia Semara I Putu Widya Semara I Wayan Bandem Adnyana I Wayan Putra Adnyana I Wayan Surata I Wayan Widhiada I. K. A. Atmika I. P. Hariwangsa I.B.P Adnyana I.B.P. Purwadnyana I.D.G.P. Swastika I.D.M.K. Muku I.D.N.P. Swastika I.G.N.W. Gunawan I.K.A Atmika I.K.A. Atmika I.P.A. Astawa I.W.A.R. Dana Ida Bagus Putu Purwadnyana K. Sebayuana Komang Metty Trisna Negara Luh Putu Ike Midiani M Sucipta Made Cuaca Vahindra Suriawan Made Sucipta Negara, I Gede Artha R. Antara Tjokorda Sari Nindhia Tjokorda Udiana Nindhia Pemayun Pemayun, Tjokorda Udiana Nindhia Pemayun Tomáš Ruml UDIANA NINDHIA PEMAYUN, TJOKORDA Wayan Nata Septiadi Widiantara, Ida Bagus Gde Y.P Sudarmojo Zdenek Knejzlík