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All Journal Jurnal Sains dan Teknologi Jurnal Informatika dan Teknik Elektro Terapan Barometer Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati (J-BEKH) International Journal of Electronics and Communications Systems Open Science and Technology
Martinus Martinus
Jurusan Teknik Mesin, Fakultas Teknik, Universitas Lampung, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Mechanical Engineering

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KEANEKARAGAMAN KUPU-KUPU NYMPHALIDAE DI PULAU PUHAWANG BESAR, TELUK LAMPUNG Kurniawati Achmad; Herawati Soekardi; Nismah Nukmal; Martinus Martinus
Jurnal Ilmiah Biologi Eksperimen dan Keanekaragaman Hayati (J-BEKH) Vol. 2 No. 1 (2014)
Publisher : Department of Biology Faculty of Mathematics and Natural Sciences Universitas Lampung in collaboration with The Indonesian Association of Biology (PBI) Lampung Branch.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jbekh.v2i1.107

Abstract

Tujuan dari penelitian ini adalah untuk mempelajari keanekaragaman dan kemelimpahan spesies kupu-kupu Nymphalidae di Pulau Puhawang Besar, Lampung. Penelitian ini dilaksanakan di Pulau Puhawang Besar pada bulan Agustus-September 2013. Metode yang digunakan adalah metode Pollard dengan menelusuri rute jalan setapak yang ada sepanjang 8,6 km. Hasil penelitian menunjukkan bahwa jumlah individu kupu-kupu Nymphaidae yang ditemukan di Pulau Puhawang Besar sebanyak 59 individu, terdiri dari 11 spesies dan termasuk dalam 6 Subfamili, yaitu Biblidinae, Danainae, Heliconiinae, Limenitidinae, Nymphalinae, dan Satyrinae. Indeks keanekaragaman kupukupu Nymphalidae di Pulau Puhawang Besar termasuk dalam kategori sedang (1,90). Kemelimpahan kupu-kupu relative tertinggi ditunjukkan oleh Ypthima baldus sebesar 37,29%, diikuti Danaus melanipus sebesar 20,34%, dan Orsotriaena medus sebesar 11,86% sedangkan kupu-kupu yang memiliki kemelimpahan relatif terendah yaitu Cupha erymanthis dan Euthalia monina (1.69%).
PENGEMBANGAN SISTEM SORTASI BUAH DUKU (LANSIUM DOMESTICUM) BERDASAR WARNA MENGGUNAKAN MIKROKONTROLER ARDUINO DAN SENSOR WARNA AS7262 Martinus Martinus; Irza Sukmana; Herry Wardono; Akhmad Riszal; Mareli Telaumbanua; Ahmad Suudi; Meizano Ardi Muhammad; Gigih Forda Nama; Eko Putra; Zulmiftah Huda; Trisya Septiana; Panji Kurniawan
Jurnal Informatika dan Teknik Elektro Terapan Vol 10, No 2 (2022)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (712.756 KB) | DOI: 10.23960/jitet.v10i2.2446

Abstract

Produk perkebunan merupakan salah satu komoditas yang sangat penting Indonesia. Duku adalah salas satu produk perkebunan musiman yang menjadi salah satu sumber pendapatan ketika panen. Namun, umur simpan duku sangat pendek, batas penyimpanan buah duku tidak lebih dari satu minggu. Buah duku akan mengalami perubahan pada warna buah, buah segar akan mengalami kecoklatan pada umur 3 sampai 5 hari pasca panen. Berubahnya warna buah duku menjadi kecoklatan tersebut tentunya dapat menurunkan kualitas dan harga dari buah duku tersebut. Pendeknya umur penyimpanan buah duku tersebut merupakan salah satu sulitnya penjualan duku. Penelitian ini melakukan pengklasifikasian duku sesuai warna dengan mengembangkan konveyor sabuk sebagai alat untuk melakukan sortasi duku berdasar warna dengan mikrokontroler. Sistem sortasi menjadi penting dalam mengelompokkan duku dalam umur yang sama sehingga dapat dipilih duku untuk pasar lokal yang sudah matang, duku untuk pasar luar yang belum matang dan akan matang dalam perjalanan serta duku yang cacat. Adapun tujuan dari riset ini adalah membuat sistem sortasi warna buah duku berbasis mikrokontroler dan mengembangkan sistem yang dapat memisahkan tiga kelompok kelas duku, duku kelas super, duku kelas a dan duku kelas b berdasar warna dengan sensor AS7262
RANCANG BANGUN SISTEM PENGHITUNG JUMLAH DAN MASSA BIJI KOPI BERBASIS MIKROKONTROLER PADA KONVEYOR SABUK Martinus Martinus; Mareli Telaumbanua; Meizano Ardi Muhammad; Adi Susilo
BAROMETER Vol 5 No 2 (2020): Barometer
Publisher : Fakultas Teknik, Universitas Singaperbangsa Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35261/barometer.v5i2.3816

Abstract

Kebutuhan manusia semakin lama semakin meningkat, berkembang dan bervariasi, untuk memenuhi kebutuhan tersebut industri membutuhkan suatu alat yang dapat mengontrol dan mengendalikan proses permesinan secara otomatis. Diantaranya industri yang memerlukan pengendalian kualitas secara otomatis adalah industri makanan dan minuman instan. Di Indonesia, industri minuman didominasi oleh hasil olahan minuman instan bubuk dan cair. Salah satunya minuman instan kopi, minuman kopi membutuhkan beberapa tahap pengolahan, salah satu yang terpenting adalah proses pemutuan biji kopi. Saat ini industri masih menggunakan tenaga konvensional yang memakan waktu, biaya, tenaga operator. Penentuan mutu dengan cara seperti ini mempunyai kelemahan dari sisi subyektivitas yang memungkinkan terjadinya kesalahan akibat kelelahan mata manusia terhadap contoh yang dianalisis. Untuk menanggulangi masalah tersebut perlu adanya mesin pemutuan biji kopi dengan sistem otomasi berdasarkan parameter besar dan kecilnya biji kopi. Dengan cara menghitung banyaknya biji kopi pada sampel 300 gram biji kopi. Penyelesaian rancang bangun ini dilakukan dengan 2 tahapan yaitu perancangan konveyor sabuk dan perancangan otomasi. Perancangan konveyor sabuk pemilah terdiri dari pemilihan konsep, desain rinci menggunakan aplikasi Solidwork dan proses pembuatan berdasarkan desain. Selanjutnya, perancangan otomasi menggunakan mikrokontroller Arduino Uno, sensor load cell dan sensor FC-51. Setelah peralatan sudah dipasang semua selanjutnya dilakukan pengujian didapatkan dari 300 gram biji kopi terhitung jumlah biji kopi yang bervariasi yaitu 907, 954, 976, 1007, dan 1036 biji kopi. Kemudian, ketinggian sensor yang optimal 6 cm dari permukaan belt conveyor dan kecepatan conveyor 1,52 m/menit agar pembacaan sensor FC-51 akurat.
PENGEMBANGAN WAHANA UKUR KECEPATAN ARUS ALIRAN SUNGAI Martinus Martinus; Ahmad Suudi; Rahmat Dendi Putra; Meizano Ardi Muhammad
BAROMETER Vol 5 No 1 (2020): Barometer
Publisher : Fakultas Teknik, Universitas Singaperbangsa Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35261/barometer.v5i1.3817

Abstract

The river has potential as a power plant with indicators in the form of river flow. Flowmeter is a measuring tool used to determine of the flow.Conventional flowmeters have limited use in a wide and deep coverage area. So it was designed a new measurement vehicle for rapid movement in waters that were difficult to reach. A GPS is used to help the accuracy of the measurement location so that data is realtime. This research was conducted by developing a measurement vehicle in the form of a ship. This vehicle had a length of 84 cm, a width of 25,5 cm, and a height of 11 cm. This measuring vehicle has a flowmeter and GPS that are controlled using Arduino. The measuring vehicle has 3 stages of manufacture in the form of physical design, control design, and assembly. Field testing is done by crossing 5 points of reference that have been. The test was carried out with 3 times the data collection on 3 sides of the river. The result of this test was the floating vehicle could measure current speed with high mobility in realtime data. One of the result of water flow measurement on the flowmeter is 430.98 cm/s with error probability 12,6%.
Internet of Things Ultraviolet Sterilizer Receiver Box: How to Design and Construct? Meizano Ardhi Muhammad; Achmad Yahya Teguh Panuju; Hadi Prayitno; Rio Ariestia Pradipta; Martinus Martinus; Gustian Ilham Akbar
International Journal of Electronics and Communications Systems Vol 1, No 2 (2021): International Journal of Electronics and Communications System
Publisher : Raden Intan State Islamic University of Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (997.802 KB) | DOI: 10.24042/ijecs.v1i2.10617

Abstract

COVID-19 is a virus that can spread through objects and depending on environmental conditions. It can last for several hours without destroying structures or disintegrating. Due to the COVID-19 pandemic, people were restricted from going outside to buy essential goods. Based on these conditions, it is necessary to design an IoT-based virus-safe package receipt box that is intuitive and comfortable for users to use, whether sending or receiving packages. People can control the system via remote control. Sterilization is carried out intelligently by considering the packet received. Design and construction of Internet of Things Ultraviolet Sterilizer Receiver Box use the Design Science Research Method. The methods consist of six stages: identify problem motivate, define the objective of a solution, design development, demonstration, evaluation, and communication. There are three parts of the system: sterilizer receiver box, mobile application, and Internet of Things. The system successfully passes the five testing scenarios: package received detection, package retrieved detection, ultraviolet irradiation, data service, and locking. The IoT-based virus-safe package receipt box can help maintain public health by preventing the COVID-19 virus with ultraviolet sterilization and supporting a modern lifestyle where people who work when the package arrives do not have to worry about the packages arriving.
Design and Construction of Duku Sorting System Based on Size Using a Microcontroller on Conveyor Work Martinus Martinus; Meizano Ardhi Muhammad; Mareli Telaumbanua; Rifqi Rhama Andrianto; Sony Ferbangkara
International Journal of Electronics and Communications Systems Vol 1, No 2 (2021): International Journal of Electronics and Communications System
Publisher : Raden Intan State Islamic University of Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.541 KB) | DOI: 10.24042/ijecs.v1i2.10612

Abstract

Duku (Lansuim Domesticum Corr)fruit harvesting is generally done manually by farmers in Indonesia so that the quality of the duku fruit, especially the uniformity of size, is not considered. The impact of this harvesting is a decrease in fruit quality and a decrease in selling prices. It is necessary to develop a new sorting machine for duku so that the fruit size is accurate. This research aims to make a sorting system for duku fruit based on size using a microcontroller on conveyor work. The sorting system uses two sensors, VL53L0X and FC-51. The design has a servo actuator to separate the fruit classes. This study developed a correct sorting of duku fruit sizes up to 97.4%, counting accuracy up to 99.4%, system stability up to 96.65%, and transient response of 100 ms. The result of testing this tool is that the ability of the Duku fruit sorting system based on size has a stability value of 96.6%. The transient response obtained is 100ms. The accuracy of the perfect sorting results is 97.4%, and the calculation of the number of duku using the system is 99.4%. The conclusion is that the researchers can create a sorting system based on size using a microcontroller on conveyor work.
Analisis Drag Force dan Aliran Fluida pada Desain Mobil Listrik Green Campus UNILA Berdasarkan Kecepatan: Drag Force and Fluid Flow Analysis at UNILA Green Campus Electric Car Design Based on Velocity Akhmad Riszal; Martinus
Open Science and Technology Vol. 1 No. 2 (2021): Open Science and Technology
Publisher : Research and Social Study Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33292/ost.vol1no2.2021.25

Abstract

Penggunaan energi fosil sangat berpengaruh terhadap keberlanjutan lingkungan. Sehingga kita harus mempunyai komitmen untuk mengurangi konsumsi bahan bakar fosil untuk menjaga lingkungan yang berkelanjutan. Hal ini senada dengan komitmen Universitas Lampung (UNILA) dalam menjadikan kampus Unila sebagai Green Campus. Pada tahun 2019, Unila mendapat peringkat ke 18 Nasional Ranking UI Green Matric. Salah satu teknologi yang dapat dikembangkan dalam menekan emisi lingkungan kampus adalah penggunaan mobil listrik. Tujuan dari penelitian ini adalah menganalisis drag force dan fenomena aliran fluida yang melewati body kendaraan dalam kajian aerodinamika terutama fenomena sparasi aliran dan terjadinya wake. Kecepatan yang akan disimulasikan pada kecepatan 10, 20, 30, 40, 50, 60 km/h. Penelitian ini menggunakan jenis penelitian Research and Development (R&D) dengan Komputasi numerik di Lab Teknik Mesin UNILA. Penelitian ini menggunakan Software Ansys Workbench 2020 R1 dengan CFD (Computational Fluid Dynamics) Solver. kemudian metode yang digunakan dalam simulasi numerik ini menggunakan metode turbulen k-epsilon realizable standard wall function. Penelitian ini menunjukkan terjadinya kenaikan drag pada setiap variasi kecepatan, hal ini dikarenakan banyaknya sparasi aliran dan adanya wake yang mempengaruhi drag force. The use of fossil fuel energy is very influential on environmental sustainability. And than we must have a commitment to reduce the consumption of fossil fuels to maintain a sustainable environment. This is in line with the commitment of the University of Lampung (UNILA) in making the Unila Green Campus. In 2019, Unila was ranked 18th in the UI Green Matric National Ranking. One of the technologies that can be developed to reduce emissions in campus area is the use of electric car. The purpose of this study is to analyze the drag force and the phenomenon of fluid flow passing through the vehicle body in aerodynamic studies, especially the phenomenon of flow separation and the occurrence of wakes. Velocity to be simulated at velocity of 10, 20, 30, 40, 50, 60 km/h. This research uses Research and Development (R&D) research with Numerical Computing at the UNILA Mechanical Engineering Lab. This research uses Ansys Workbench 2020 R1 software with CFD (Computational Fluid Dynamics) Solver. The method used in this numerical simulation uses the turbulent k-epsilon realizable standard wall function method. This study shows an increase in drag at each velocity variation, this is due to the large number of flow separations and the presence of wakes that affect drag force.  
PERILAKU GETARAN PAKSA TEREDAM PADA TABUNG TERBENAM MENGAMBANG (SUBMERGED FLOATING TUBE) YANG MENDAPAT GAYA GANGGUAN GELOMBANG Jamiatul Akmal; Novri Tanti; Martinus Martinus; Thomas Wisudarma; Muhammad Yakuti Arsi
Jurnal Sains dan Teknologi Vol 20, No 2 (2021): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jst.v20.n2.p45-61

Abstract

In the maritime structure, there are many cylindrical structures found at various depths of the sea (submerged floating tube / SFT). Some examples of application are submarine pipe structures, structural support poles, and recently, tunnel structures have been developed for inter-island transportation. This article presents the dynamic behavior of SFT which covers the wave action force, hydrodynamic damping factor and amplitude response to damped vibrations. The wave action force refers to the Morison equation, the damping factor is based on the dragforce which is influenced by flow velocity and geometric factors. Measurement data were analyzed non-dimensionally. The conclusion is that the resulting formula can be used to predict the wave action force on a floating immersed tube at several depth positions, the damping factor and the amplitude of the damped vibration.
Co-Authors Achmad Yahya Teguh Panuju Adi Susilo Ahmad Suudi Ahmad Suudi Eko Putra Gigih Forda Nama Gustian Ilham Akbar Hadi Prayitno Herawati Soekardi Herry Wardono Huda, Zulmiftah Irza Sukmana Jamiatul Akmal Kurniawati Achmad Mareli Telaumbanua Meizano Ardhi Muhammad Meizano Ardi Muhammad Meizano Ardi Muhammad Muhammad Yakuti Arsi Nismah Nukmal Novri Tanti Panji Kurniawan Pradipta, Rio Ariestia Rahmat Dendi Putra Rifqi Rhama Andrianto Riszal, Akhmad Sony Ferbangkara Thomas Wisudarma Trisya Septiana