cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Muhamad Jafri
Contact Email
muhamad.jafri@staf.undana.ac.id
Phone
+6281237119375
Journal Mail Official
teknik.mesin@undana.ac.id
Editorial Address
Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Nusa Cendana, Jl. Adi Sucipto PO Box 85001
Location
Kota kupang,
Nusa tenggara timur
INDONESIA
LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Published by Universitas Nusa Cendana
ISSN : 23563222     EISSN : 24073555     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Lontar Jurnal Teknik Mesin Undana merupakan jurnal ilmiah rekayasa teknologi, khususnya bidang Teknik Mesin, meliputi: Energy Convertion, Manufacture Process, Engineering Design, Material Engineering.
Arjuna Subject : -
Articles 13 Documents
 1   2 
Search results for , issue "Vol 12 No 01 (2025): April 2025" : 13 Documents clear
PENGUJIAN LEMARI PENGERING KOPRA TIPE KABINET SISTEM HYBRID (SOLAR DRYER PLAT DATAR – HEATER) PUAY, FERDINAN; Koehuan, Verdy A.; Tobe, Adi Y.
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.v12i01.20101

Abstract

Along with the development of drying process technology, solar energy is used as an energy source whose availability will never run out and this energy can also be used as alternative energy which will be converted into electrical energy, drying It is hoped that using a solar dryer will be able to produce high quality copra and be a form of saving on electrical energy usage. After testing 3 times using direct heating from a solar energy source and 2 variations of heater heating elements with a power of 110 watts and 260 watts respectively, the most efficient results were obtained, namely in testing using a 100 watt heating element on the second day. During the 4 hours of testing, the water content value that came out of the coconut meat reached 22.49% compared to testing on the first and third days. This is caused by changes in environmental temperature (Tl) and environmental humidity (Hl) which affect the temperature conditions in the equipment drying room. For testing using 260 watts of power, the results were not efficient because it has very high power so that the energy stored in the battery cannot work during the 4 hours of drying time.
Pengujian Mekanik Serat Ijuk Pre Treatmeat NaOH Dengan Bahan Matriks Poliester Nana, Josef Etheldreda; Adoe, Dominggus G. H.; Selan, Rima Nindia
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.v12i01.20145

Abstract

In this increasingly developing era, the manufacturing industry is experiencing very rapid development. The need for materials in this field is also increasing. Materials with certain characteristics such as strength, toughness, and other mechanical properties according to needs are highly sought after. Composite is a material formed from a combination of two or more constituent materials through a non-homogeneous mixture, where the mechanical properties of each constituent material are different, the use of composite materials properly and efficiently requires extensive knowledge of their mechanical properties. While the use of ijuk is still limited to household needs, even exported in raw material conditions, therefore the use of ijuk as a basic material for composites is a new hope for utilizing ijuk into a commodity that has higher added value. The results of the study on the Testing of Ijuk Fiber Mechanics Pre Treatmeat Naoh With Polyester Matrix Material concluded that concentration affects the bending strength of 9.44 N / mm2 and deflection of 37.94 mm of ijuk fiber with the best results at a concentration with a soaking time of 60 minutes.
KARAKTERISASI BAJA KARBON ST 37 AKIBAT PACK CARBURIZING ARANG CANGKANG KEMIRI DENGAN KATALISATOR SERBUK KERANG ALE-ALE PANTAI OESAPA KOTA KUPANG Wiskarjo, Marianus; Bunganaen, Wenseslaus; Jasron, Jahirwan Ut
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.v12i01.21001

Abstract

This study aims to determine the changes in microstructure and the increase in hardness of low-carbon steel (ST 37) through the pack carburizing process. The method used involves utilizing charcoal derived from candlenut shells as a carbon source and ale-ale shell powder as a catalyst. The experiment was conducted using 10 steel specimens, where 9 specimens underwent pack carburizing treatment with variations in catalyst composition (10%, 20%, and 30% CaCO₃) at a temperature of 900°C with a holding time of 2 hours, followed by a quenching process using 40% saltwater. The results of the study indicate that the pack carburizing treatment successfully increased the surface hardness of the steel significantly and caused a microstructural transformation from ferrite-pearlite in the initial material to martensitic structure on the carburized surface. These findings suggest the potential use of natural materials as an environmentally friendly alternative for carbon media and catalysts to enhance the mechanical properties of low-carbon steel.

Page 2 of 2 | Total Record : 13

 1   2 

Filter by Year

2025 2025


Reset
Filter By Issues
All Issue Vol 12 No 02 (2025): Oktober 2025 Vol 12 No 01 (2025): April 2025 Vol 11 No 02 (2024): Oktober 2024 Vol 11 No 01 (2024): April 2024 Vol 10 No 02 (2023): Oktober 2023 Vol 10 No 01 (2023): April 2023 Vol 9 No 02 (2022): Oktober 2022 Vol 9 No 01 (2022): April 2022 Vol 8 No 02 (2021): Oktober 2021 Vol 8 No 01 (2021): April 2021 Vol 7 No 02 (2020): Oktober 2020 Vol 7 No 01 (2020): April 2020 Vol 6 No 01 (2019): April 2019 Vol 5 No 1 (2018): April 2018 Vol 4 No 2 (2017): Oktober 2017 Vol 4 No 1 (2017): April 2017 Vol 3 No 2 (2016): Oktober 2016 Vol 3 No 1 (2016): April 2016 Vol 2 No 2 (2015): Oktober 2015 Vol 2 No 1 (2015): April 2015 Vol 1 No 2 (2014): Oktober 2014 Vol 1 No 1 (2014): April 2014 More Issue