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All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Journal of Engineering and Technological Sciences ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Pengabdian Masyarakat Peternakan JMPM (Jurnal Material dan Proses Manufaktur) Jurnal Pengabdian UntukMu NegeRI JTERA (Jurnal Teknologi Rekayasa) AL-JAZARI JURNAL ILMIAH TEKNIK MESIN SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan at-tamkin: Jurnal Pengabdian kepada Masyarakat Jurnal Mesin Nusantara Jurnal Pengabdian Vokasi

Kristomus Boimau

Jurusan Teknik Mesin, Fakultas Sains Dan Teknik, Universitas Nusa Cendana

Author-ID : 2813868

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy 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 Public Health Social Sciences Transportation Veterinary Other

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Analisis Kekuatan Tarik Komposit Hybrid Berpenguat Chip Daun Gewang Dan Serat Pendek E-Glass Jefri S. Bale; Yeremias M. Pell; Kristomus Boimau; Finsensius Lelu
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 01 (2020): April 2020
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v7i01.3543

The use of natural fiber as reinforcement for composite materials provides several advantages such as low density, biodegradable, easily recycled, inexpensive, good mechanical properties, and renewable because it comes from nature. One of the natural fibers that can be used as reinforcement for polymer composites is gewang leaves. This study aims to analyze the tensile strength of a hybrid composite with gewang leaf chip and E-glass short fiber reinforcement. The tensile strength of 61.25 Mpa and the stiffness modulus of 90.83 MPa produced by the E-glass fiber composite which is higher compared to the gewang leaf chip composite and the hybrid composite. The results showed that gewang leaf chip composite and the hybrid (gewang leaf chip + e-glass short fiber) can only be used for accessories applications such as car dashboards in the transportation industry that mechanical strength is not the prime factor.

Desain Dan Analisis Struktur Rangka Motorcycle Lift Menggunakan Perangkat Lunak Solidworks Kristomus Boimau; Matheus M. Dwinanto; Valerius G. Seranian
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v8i01.4185

Structural analysis is the science of determining the effects of loads on physical structures and their components. Structural analysis combines the fields of engineering mechanics, materials engineering, and engineering mathematics to calculate deformation of structures, internal forces, stresses, bearing reactions, accelerations, and stability. The designer chooses solidwork software for design and analysis because this software can properly simulate the design and calculation of forces on machine tools and elements. Solidwork contains a collection of simulation programs that are easy to use and can be used to create part programs and material selection used for mechanical analysis at work in order to obtain stress, displacement and safety factors (factory safety). The designed motorcycle lift features a chrome stainless steel frame with a control system, with main dimensions 1800 mm length, 700 mm width and 200 mm height at minimum position, 200 kg weight and 855 mm maximum height reach. Based on the identification using REBA in the mechanical posture after the design, it was found that the risk level decreased compared to before the design, from a high risk level to a low risk level. The results of the mechanical evaluation of the use of the designed motorcycle lift, there are several things that have become shortcomings of this design, among others, in terms of the speed of time in raising the position of the motorbike and the boot of the motorcycle lift which is still too heavy.

Tensile Characteristics of Bio-Composite Material Reinforced with Corn Skin Jefri Bale; Yeremias Pell; Kristomus Boimau; Boy Bistolen; Dion Rihi
Journal of Engineering and Technological Sciences Vol. 53 No. 5 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.5.13

The main focus of the present work was to study corn skin as reinforcement of polyester bio-composite (CSPCs). The effect of reinforcement type, i.e. short fibers and discontinuous chips, on the tensile properties was studied. The corn skin materials were chemically treated with NaOH and added as reinforcement of polyester bio-composite using the hand lay-up fabrication method. Tensile tests were carried out according to ASTM D3039. The tensile strength characteristics of stress and modulus showed a different behavior between the two types of reinforcement due to a slight difference in specimen thickness, which affected the calculated stress and modulus values. Furthermore, from a physical properties point of view, the larger surface area of CSC compared to CSF, which still contains a lignin layer after the treatment with NaOH, could decrease the interfacial bonding between polyester as the matrix and CSC as the reinforcement. The tensile damage characteristics showed brittle behavior, propagataing perpendicular to the loading direction. Matrix cracking and interfacial debonding were identified as the main two damage modes of the CSF bio-composite and the CSC bio-composite, where the final failure was dominated by fiber pull out and chip fracture.

Penerapan Teknologi Dalam Kerangka Peningkatan Produktivitas Usahatani Ternak Obed Haba Nono; Petrus Kune; Agust R. Riwu; Kristomus Boimau
Jurnal Pengabdian Masyarakat Peternakan Vol 4, No 2 (2019): Jurnal Pengabdian Masyarakat Peternakan
Publisher : Jurusan Peternakan Politeknik Pertanian Negeri Kupang

Tujuan dari kegiatan ini adalah untuk : 1) meningkatkan keterampilan mitra dalam mengunakan sejumlah teknologi tepat guna ;2) meningkatkan produktivitas aneka usaha. Hal ini sesuai dengan karakteristik masalah yang dihadapi mitra, yaitu : manajemen produksi yang mengacu kepada optimalisasi sumber daya untuk peningkatan produktivitas , terbatasnya peralatan produksi dan aspek sosial ekonomi yang dialami 2 kelompok tani ternak yaitu Dahulu Rasa dan Tunas Baru.Metode yang diterapkan adalah : (1) penentuan mitra dan jenis IPTEKS yang diterapkan adalah observasi, wawancara mendalam sehingga penentuan mitra dilakukan secara purposive. (2) metoda dalam aplikasi IPTEKS berupa pelatihan, uji demoplot serta pendampingan. Demoplot berupa aplikasi dari sejumlah teknologi yaitu : (1) teknologi IPAT-BO untuk tanaman padi, (2) mesin tetas, (3) pembuatan reaktor/aplikasi biogas, dan (4) pembuatan serta aplikasi pupuk organik berbahan baku lokal. Hasil kegiatan berupa sejumlah produk meliputi : gabah, ternak ayam/babi bermutu, pupuk organik (padat dan cair) hasil aplikasinya: aneka sayur -mayur. Hasil biogas berupa :gas untuk memasak, pupuk organik (padat dan cair), kangkung serta aneka sayuran organic. Kesimpulan : bentuk/jenis IPTEKS berupa sejumlah teknologi tepat guna berdampak kepada : (1) hasil IPAT-BO sanggup meningkatkan produktivtas gabah sebesar 54,67 persen, efisiensi benih dan air sebesar 300% (2) efisiensi waktu dan produktivitas dan mutu ayam meningkat (3-3,5 kali lipat); (3) Produksi meningkat dan efisiensi input/waktu untuk sayur organic (25-50%) dan (4) Efisiensi biaya penggunaan BBM dapat mencapai Rp. 8,76 juta pertahun dari 2 buah kompor dari sebuah reaktor biogas.Kata kunci : teknologi, IPAT-BO, biogas, pupuk organik, mesin tetas.

PENGARUH PANJANG SERAT TERHADAP SIFAT BENDING PAPAN KOMPOSIT POLIESTER BERPENGUAT SERAT BUAH LONTAR Kristomus Boimau; Theo Da Cunha
ROTOR 2016: ROTOR Special Edition
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (382.187 KB)

The need for wood as a building material is increasing, but the existing forest conditions are difficult to meet the demand. Several alternatives have been developed as an effort to overcome the lack of wood, for example by creating wood derivative products such as fiberboard, particle board, and cement board. The raw materials for making fiberboard usually use natural fibers derived from plants containing fibers such as kenaf, banana, hemp, sisal, lontar and flax. The prospect of fiberboard development is very potential, because Indonesia has a suitable climate overgrown by these fibrous plants.The purpose of this study is to determine the effect of fiber length on the bending properties of polyester composite board reinforced by palm fibers. The material used in this research is lontar fibers with fiber length 1 cm, 2 cm and 3 cm and polyester resin. Before the fiber is used as a reinforcing medium, the fibers are first treated with 5% alkali by soaking for 1 hour. After the fibers were removed, then rinsed with clean water to free the fiber from alkali and then dried. The ratio of fiber-matrix composition used in this study was adjusted to the rule of mixture (ROM), wherein the volume fraction of fiber (Vf) used was 30%. The composite board is made by hand-lay-up method and continued with 24 hours by pressing with hydraulic jack. Furthermore, the molded composite is cut into bending test specimen according to ASTM D790 standard. The nature of bending of composite board is known through the process of testing three point bending by using universal testing machine.The result of bending test shows that the test specimen with 3 cm fiber length has a higher bending strength value of 18.42 Mpa, while the composite with 2cm fiber length is 16.35 Mpa and 15,44 Mpa for 1cm fiber length. Keywords: composite, lontar fiber, fiber length, bending

UPAYA MENCIPTAKAN LINGKUNGAN YANG SEHAT MELALUI PEMBUATAN MCK BAGI WARGA KAMP PENGUNGSI TIMOR BARAT Kristomus Boimau; Rima Nindia Selan; Adi Yermia Tobe; Jack C. Pah
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 4, No 1 (2020): November
Publisher : Universitas Muhammadiyah Mataram

ABSTRAKKamp pengungsi Dilor Tuapukan adalah salah satu contoh kamp pengungsi di Timor Barat yang masih dihuni oleh pengungsi sejak tahun 1999. Kamp pengungsi seluas ± 2,25 ha (150 m x 150 m) ini dihuni oleh 111 KK dengan jumlah jiwa sebanyak 275 orang. Seluruh KK tinggal di rumah darurat yang tidak layak huni sesuai standar rumah sehat dengan kondisi ALADIN (atap, lantai, dinding) seadanya yakni atap dari daun gewang, dinding dari bebak/pelepah dan lantai tanah. Selain itu, ketersediaan MCK pun sangat kurang, bahkan mayoritas KK (± 85%) di kamp ini tidak memilik MCK sendiri, sehingga mereka memanfaatkan kebun di sekitar kamp untuk buang air besar (BAB). Dari hasil pantauan di wilayah kamp pengungsi Dilor terlihat ada sebuah MCK permanen, 12 MCK darurat berdinding daun gewang tanpa closet. Saluran pembuangan air dari MCK pun macet sehingga air tergenang disepanjang saluran. Hal ini tentu menciptakan lingkungan yang tidak sehat. Tidak tersedianya MCK yang layak sesuai standar kesehatan disebabkan karena keterbatasan dana untuk membangun MCK serta ketidakpahaman warga akan pentingnya kesehatan lingkungan. Tujuan dari kegiatan ini adalah untuk mengatasi ketidaktersediaan MCK dengan membuatkan MCK umum bagi warga. Kegiatan ini dilaksanakan selama 2 bulan dan menghasilkan 2 unit MCK permanen dengan masing-masing MCK memiliki 3 kamar. Setelah MCK selesai dibuat dan digunakan, selanjutnya tim pelaksana melakukan monitoring ke lokasi setiap 2 minggu sekali untuk memantau aktifitas warga dalam menggunakan MCK. Hasilnya menunjukkan bahwa warga tidak buang air besar (BAB) sembarangan. Kata kunci: kamp pengungsi; lingkungan; MCK. ABSTRACTThe DilorTuapukan refugee camp, is one of the refugee camps in West Timor that has been inhabited by refugees since 1999. The area of this camp is approximately 2.25 hectares (150 m x 150 m).This refugee camp is inhabited by 111 families with a total of 275 people.The whole family lives at emergency houses. The houses are not suitable for habitation (viewed from the Healthy Home Standard). The condition of the houses that they live in, especially in terms of ALADIN (roof, floor, walls) conditions is very unhealthy and very simple. The roof of the houses are made of Gewang Leaves, the walls are made of Bebak / Midrib and the floor are made of land only. In addition, the availability of facilities for bathing, washing clothes, and defecating (MCK) are very lacking. The majority of families (± 85%) in this camp do not have their own toilet. To carry out the MCK activities, they used the garden around the camp. For example, to defecate (BAB) is stiffened in the garden area. From the results of monitoring in the area of the Dilor refugee camp, it can be seen that there is a permanent toilet only, 12 emergency toilets with Gewang leaf walls without watercloset. The drainage channel from the toilets was jammed, so that the water was stagnant along the channel. This certainly creates an unhealthy environment. The unavailability of proper toilets according to health standards, are due to limited funds to build toilets, and residents' lack of understanding of the importance of environmental health. Therefore, to overcome the unavailability of toilets, the implementation team will make public toilets for residents. This activity was carried out for 2 months, and has succeeded build 2 permanent MCK units with each MCK having 3 rooms. Keywords: refugee camp; environment; MCK.

Pengaruh Variasi Ketinggian Reservoir Terhadap Daya Turbin Air Impuls Dengan Sudu Bolak-Balik Kristomus Boimau; Nurhayati Nurhayati; Rima N. Selan
Jurnal Mesin Nusantara Vol 3 No 1 (2020): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v3i1.14577

Air adalah salah satu Sumber Daya Alam (SDA) yang dapat dimanfaatkan energinya, sehingga dari semula hanya memiliki energi potensial dapat diubah menjadi energi kinetik, dimana energi kinetik tersebut dapat dimanfaatkan menjadi energi mekanis pada sistem kerja turbin, dan kondisi debit air sangat mempengaruhi daya turbin, oleh karena itu penelitian ini memvariasikan ketinggian reservoir untuk merubah besar debit air dan mengamati pengaruhnya terhadap daya turbin air impuls dengan sudu bolak-balik. Reservoir yang digunakan dalam penelitian ini memiliki volume 0,2 m3, dan diameter saluran keluarnya adalah 0,055 m, sedangkan turbin airnya memiliki diameter 0,18 m dengan jenis impuls yang sudunya bolak-balik. Pada ketinggian reservoir 0 m, debit airnya adalah 0,008m3/s dan menghasilkan daya sebesar 37,040 W, sedangkan saat ketinggian reservoir dinaikkan pada 0,40 m daya yang dihasilkan turbin juga semakin meningkat menjadi 92,236 W. Ketika tinggi reservoir dinaikkan hingga 0,89 m, daya turbin adalah 192,987 W, kondisi ini menunjukkan bahwa tinggi reservoir berbanding lurus dengan daya turbin, sehingga jika reservoir semakin tinggi maka daya turbin juga semakin bertambah.

Pelatihan Perawatan Pompa Hidram untuk Kelompok Tani Utama Di Daerah Baumata Wenseslaus Bunganaen; Muhamad Jafri; Verdy A Koehuan; Isak S Limbong; Yeremias M Pell; Kristomus Boimau
at-tamkin: Jurnal Pengabdian kepada Masyarakat Vol. 3 No. 2 (2020): At-Tamkin - Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Islam Raden Rahmat Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33379/attamkin.v3i2.553

Dry land agriculture is a crop cultivation activity carried out in moderate to severe drought conditions during most of the growing season. As a result, special cultivation techniques, types of crops and farming systems are needed to enable sustainable production. The partner involved in the Program Kemitraan Masyarakat (PKM) is a farmer group called the main farmer group. The main farmer group is located in Baumata village, Taebenu sub-district, Kupang district. This farmer group has used appropriate technology in the form of a hydram pump. The Hydram Pump, which is located in Baumata village is a product of the LP2M through the Mechanical Engineering Study Program, Faculty of Science and Engineering in 2018and is still running and is still being used by farmer groups. Based on the survey and coordination of the implementation team to the location until December 2019, it was concluded that there was a need for field activities in the context of training activities for members of farmer groups on how to repair, maintain and deal with pump problems which decrease productivity and aspects of pump work functions accordingly with a description of the report of the members of the Farmer Group.

Pengaruh Perlakuan Alkali dan Orientasi Serat Buah Patola Terhadap Sifat Impak Komposit Poliester Kristomus Boimau; Rima Nindia Selan; Demas Abia Manimalay
JTERA (Jurnal Teknologi Rekayasa) Vol 6, No 1: June 2021
Publisher : Politeknik Sukabumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31544/jtera.v6.i1.2021.101-108

Komposit polimer berpenguat serat alam menjadi tren bagi peneliti dalam beberapa dekade terakhir karena memberikan banyak keuntungan dan sangat ramah lingkungan. Penelitian ini bertujuan untuk mengetahui pengaruh perlakuan alkali dan orientasi serat terhadap sifat impak komposite poliester berpenguat serat buah patola (luffa cylindrical). Bahan yang digunakan adalah serat buah patola dan matrik poliester. Sebelum serat digunakan sebagai penguat pada penelitian ini, terlebih dahulu serat diberi perlakuan alkali dengan cara direndam dalam larutan alkali dengan konsentrasi larutan sebesar 5%, 10%, dan 15% selama 1 jam. Orientasi serat yang digunakan adalah [0/45/0] dan [45/0/45]. Selanjutnya komposit dicetak dengan metode hand ly up diikuti penekanan selama 24 jam. Komposisi campuran serat dan matrik didasarkan pada aturan Rule of Mixture (RoM), dengan fraksi berat serat sebesar 16,8%. Spesimen uji dibuat sesuai standar ASTM D256 dan diuji dengan alat uji impak Charpy. Hasil pengujian impak menunjukkan bahwa kekuatan impak tertinggi diperoleh pada komposit yang diperkuat oleh serat dengan perlakuan NaOH 10% dan orientasi serat [0/45/0] yaitu 0,0068J/mm2, sedangkam kekuatan impak terendah diperoleh pada spesimen dengan konsentrasi larutan 5% dan orietasi serat [45/0/45] yaitu 0,0037 J/mm2.

PENGARUH TEMPERATUR TERHADAP SIFAT BENDING KOMPOSIT POLIESTER BERPENGUAT SERAT DAUN GEWANG Kristomus Boimau
AL-JAZARI JOURNAL SCIENTIFIC OF MECHANICAL ENGINEERING Volume 6, Nomor 2, Nopember 2021
Publisher : Universitas Islam Kalimantan Muhammad Arsyad Al Banjari

Perilaku sifat mekanik komposit dipengaruhi oleh kondisi lingkungan dimana material itu diaplikasikan, salah satu diantaranya adalah temperatur. Penelitian ini bertujuan untuk mengkaji pengaruh temperatur terhadap sifat bending komposit polyester berpenguat serat pucuk daun gewang. Material yang digunakan dalam penelitian ini adalah resin polyester sebagai matriks dan serat daun gewang sebagai penguatnya. Serat daun gewang diperoleh dari pucuk pohon gewang yang diserut, kemudian dikeringkan dengan sinar matahari. Selanjutnya serat diberi perlakuan alkali 5% dengan cara direndam selama 30 menit. Fraksi volume serat yang digunakan adalah 32%, sedangkan matrik sebesar 68%. Komposit hasil cetakan dibentuk menjadi spesimen uji sesuai standar ASTM D790. Sebelum dilakukan pengujian bending, specimen uji dipanasakan dalam dapur/oven listrik selama 1 jam dengan variasi temperature sebesar 1000C, 1500C dan 2000C kemudian dikeluarkan dan diuji. Hasil pengujian menunjukkan bahwa nilai kekuatan bending komposit yang dipanaskan pada temperature 2000C memiliki nilai terendah yakni sebesar 42.8 MPa sedangkan nilai tertinggi sebesar 75.64 MPa diperoleh pada specimen yang dipanaskan pada temperature 1000C. Hasil foto makro patahan menunjukkan adanya retak kecil pada komposit yang dipanaskan pada temperatur 1000C, sedangkan specimen uji yang dipanaskan pada temperatur 2000C patah menjadi 2 bagian.

Co-Authors Adoniram Sabuin Agust R. Riwu Ben Vasco Tarigan Boy Bistolen Charles D Lakidang Demas Abia Manimalay Dion Rihi Dominggus Godlief Heryson Adoe Erich Maliwemu, Erich Finsensius Lelu Hendrikus Wona Wona Hironimus R. Fao I Made S. Aryanta Jack C. Pah Jahirwan Ut Jasron Jefri Semuel Bale Jorhans J. S. Nesimnasi Jusuf B. Tododjahi Maria Agustina Kleden Martinus K. Moto Matheus M. Dwinanto Muhamad Jafri Murizal Matasina Nurhayati Nurhayati Obed Haba Nono Petrus Kune Philipi De Rozari Rima Nindia Selan Theo Da Cunha Tobe, Adi Yermia Valerius G. Seranian Verdy A Koehuan Wenseslaus Bunganaen Yeremias M. Pell Yeremias M. Pell

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