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All Journal Jurnal Energi Dan Manufaktur Jurnal Keteknikan Pertanian Jurnal Simetris Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN AJIE (Asian Journal of Innovation and Entrepreneurship) Journal of Mechanical Engineering Science and Technology Turbo : Jurnal Program Studi Teknik Mesin JMM (Jurnal Masyarakat Mandiri) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin MEKANIKA - JURNAL TEKNIK MESIN Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal Elemen Jurnal Energi dan Teknologi Manufaktur Abdi Dosen : Jurnal Pengabdian Pada Masyarakat J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Indonesian Journal of Applied Research (IJAR) Mechonversio: Mechanical Engineering Journal International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Journal of Community Development Jurnal Energi Baru dan Terbarukan Jurnal Abdi Masyarakat Indonesia Jurnal Ilmiah Teknik Mesin Poros Automotive Experiences Journal of Mechanical Engineering, Science, and Innovation Industrial Research Workshop and National Seminar Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII National Multidisciplinary Sciences Jurnal Kendali Teknik dan Sains Journal of Mechanical Engineering Jurnal Polimesin
Nasrul Ilminnafik
Jurusan Teknik Mesin Fakultas Teknik Universitas Jember
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KINERJA DAN EMISI MESIN DIESEL 1 SILINDER BERBAHAN BAKAR CAMPURAN BIODIESEL NYAMPLUNG DAN ETANOL Nasrul Ilminnafik; Atlanta Iwananda; Muh. Nurkoyim Kustanto; Rima Zidni Karimatan Nisa
Jurnal Rekayasa Mesin Vol. 14 No. 2 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i2.1335

Abstract

Research has been carried out on the effect of biodiesel and ethanol fuel mixtures on diesel engine performance and emissions. Ethanol (C2H5OH) is a type of alcohol that can improve the characteristics of biodiesel. The effect of ethanol on engine performance was investigated by adding B30 (a mixture of 30% nyamplung biodiesel (calophyllum inophyllum) and 70% petrodiesel). The concentration of ethanol added to B30 is 10% v/v which is called the B30E10 mixture. The composition of the fuel mixture is B0 (petrodiesel), B30, B30E10 and Pertadex. The research was conducted on a single cylinder four stroke diesel engine with a natural air system and coupled to a generator that functions as a dynamometer. Three times the test was carried out for each load applied to the engine varying from 0, 200, 400, and 600 W at a constant rotation speed of 1700 rpm. The research results that the constant engine speed method and variations in lamp load produce torque values (Nm) and effective power (kW) which tend to be the same between fuels, this happens because it is influenced by the governor mechanism. The highest fuel consumption occurred at the addition of 10% ethanol (B30E10). The lowest thermal efficiency occurs in B30E10. Exhaust emissions of carbon monoxide decreased with the addition of 10% ethanol.
Ethanol Blend Effects on The Spray Properties of a Biodiesel Fuel by Ambient Pressure Variation Nasrul Ilminnafik; Intan Hardiatama; Ahmad Adib Rosadi; Andi Sanata; Faiz Firdausi
Indonesian Journal of Applied Research (IJAR) Vol. 4 No. 2 (2023): Indonesian Journal of Applied Research (IJAR)
Publisher : Universitas Djuanda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30997/ijar.v4i2.287

Abstract

Diesel engine spray nozzles are crucial to pollutant generation and engine efficiency. Nozzle performance can be enhanced by adjusting the nozzle's internals. A successful demonstration of the nozzle would be one in which the spray's outcome was uniformly dispersed throughout a wide area, with the grains scattered similarly. The purpose of this research was to examine how a diesel-ethanol characteristic under normal atmospheric pressure (spray tip penetration, the velocity of spray, and spray angle) and, in general, to assess the performance of biodiesel fuel on diesel engines, a substantial amount of biodiesel and operational expenses for the engine are necessary. It was an experimental approach to the study. The research involved recording spray fuel at the nozzle. Using a 480 fps high-speed camera, we tested BD20, BD20E5, and BD20E10 fuel at three different ambient pressures (1 bar, 2 bar, and 3 bar). The injection pressure was 15 MPa, and the fuel temperature was 28.2 degrees Celsius. Spray tip penetration and spray velocity decreased and spray angle increased after ethanol was added to the mixture, consistent with the studies' findings. Lowered spray tip penetration, slower spray speeds, and a complete spray angle result from the increased ambient pressure.
PEMANFAATAN LIMBAH PRODUKSI ARANG KAYU MENJADI BRIKET ARANG SEBAGAI UPAYA PENINGKATAN KEBERDAYAAN EKONOMI PEDESAAN Digdo Listyadi Setyawan; Nasrul Ilminnafik; Hary Sutjahjono; Intan Hardiatama; Misto Misto
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 7, No 3 (2023): September
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v7i3.16607

Abstract

ABSTRAKDi Dusun Gunung Giri, yang  terletak di Desa Wonosari, Kecamatan Grujugan, Kabupaten Bondowoso,  terdapat sejumlah UMKM pembuat arang kayu. Arang kayu  biasanya digolongkan menjadi tiga A, B dan C.  Harga arang kayu untuk golongan A  adalah Rp. 2.700 per kg, golongan B adalah Rp. 500 per kg , sedangkan untuk golongan C biasanya dibuang.  Sebetulnya produk arang golongan B dan C dapat diolah lebih lanjut menjadi bentuk briket sehingga  memiliki nilai ekonomis yang lebih tinggi. Program Pengabdian kepada Masyarakat (PKM) dilaksanakan dengan menggunkan metode penyuluhan dan  pelatihan kepada mitra yang berjmlah sekitar 15 orang pengrajin arang yang pada akhir program dilakukan evaluasi berupa kuisioner dan berkonsultasi berkelanjutan untuk pengambangan produk arang kayu yaitu menjadikan arang golongan B dan C menjadi briket arang. Hasil kegiatan pengabdian masyarakat menunjukkan bahwa telah terjadi peningkatan softskill SDM  pengrajin  sebesar lebih dari 80 % dan peningkatan nilai ekonomis dari pembuatan beriket arang sebesar 200 %. Kata kunci: briket; arang kayu; pelatihan; penyuluhan. ABSTRACTIn Gunung Giri Hamlet, which is located in Wonosari Village, Grujugan District, Bondowoso Regency, there are a number of SMEs producing wood charcoal. Wood charcoal is usually classified into three A, B and C. The price of wood charcoal for class A is Rp. 2,700 per kg, group B is Rp. 500 per kg, while for group C it is usually discarded. Actually, the products of group B and C charcoal can be further processed into briquettes so that they have a higher economic value. The Community Service Program (PKM) was carried out using counseling and training methods for approximately 15 partners who were charcoal craftsmen who at the end of the program were evaluated in the form of questionnaires and ongoing consultations for the development of wood charcoal products, namely turning class B and C charcoal into charcoal briquettes. The results of the community service activities show that there has been an increase in the soft skills of craftsmen's human resources by more than 80% and an increase in the economic value of making charcoal beriket by 200%. Keywords: briquettes; wood charcoal; training; counseling.
A study on Flame Characteristics Premixed Burning by Giving Magnetic Field Induction Deny tomy andrianto; Muh. Nurkoyim Kustanto; Yuni Hermawan; Nasrul Ilminnafik; Salahuddin Junus
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3497

Abstract

This study aims to compare the effect of magnetic field induction on the characteristics of the fire resulting from the combustion of premixed biodiesel calophyllum inophyllum . Further research on premixed combustion flames due to magnetic field induction. As time goes by, petroleum is currently running low, therefore alternative biofuels are needed. One type of non-food vegetable oil is Jatropha and calophyllum inophyllum  oil, besides not being consumed, it can be processed into biodiesel as fuel. To get a more effective and efficient flame, you can apply a magnetic field effect to the fire, especially in terms of the burning rate of the fire. The experimental research method is to heat calophyllum inophyllum biodiesel until it is in the form of steam, then flow it to the burner which will then be given air which is controlled by the flow mass. Then the fire is ignited and the mass of the air flow is increased until the fire is lifted until it is extinguished. Two magnets are placed between the burners by varying the direction of the magnetic field N-S, N-N and the results of this study are the shape of the flame. The resulting fire is more transparent, clearer and more visible. The direction of the N-S magnetic field causes the temperature to be higher than the direction of the N-N magnetic field. The high and low of the flame is affected by the direction of the magnetic field, the stronger the N-S magnetic field. The magnetic field can affect the burning speed of the biodiesel flame. In a poor mixture (ϕ 1) in the presence of magnetic influence, the rate of fire is lower without the influence of a magnetic field, but in a rich mixture (ϕ 1) in the presence of a magnetic influence, the rate of fire is higher than without the influence of a magnetic field. This is due to the magnetic influence that induces oxygen. Oxygen is paramagnetic, so it can be attracted by magnetic fields.
Effects of modified intake surface to gasoline engine performance with the use of LPG Nasrul Ilminnafik; Agus Triono; Reynaldi Akbar Ali; Rizal Mahmud; Dani Hari Tunggal Prasetiyo
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.4008

Abstract

Indonesia observes a yearly rise in motor vehicle possession. Failure to consider alternate fuels in these trends may result in the depletion of gasoline. Out of the potential alternatives, Liquified Petroleum Gas (LPG) appears to be the most favorable. The sole issue lies in the elevated engine temperature and subsequent decrease in performance caused by its utilization. To address this vulnerability, it is advisable to employ a cooling injection method, such as water injection. Nevertheless, the rise in exhaust emissions linked to water injection highlights the necessity for optimization. This study aims to optimize coolant injection systems by conducting experiments with different modifications, such as conventional intake surfaces, dimple intake surfaces with gaps, and dimple intake surfaces without gaps. The gapless dimple inlet surface demonstrates superior performance in terms of exhaust emissions, power, and torque compared to both conventional inlet surfaces and slotted dimple inlet surfaces
Studi Kecepatan Pembakaran Laminar dan Tinggi Api Premix Avgas 100 LL dengan Variasi Ekuivalen Rasio Nasrullah, Muhammad Nur Cahyo Hidayat; Kustanto, Muh Nurkoyim; Darsin, Mahros; Ilminnafik, Nasrul; Syuhri, Skriptyan Noor Hidayatullah
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2952

Abstract

Aviation gasoline atau yang umum disebut dengan avgas merupakan bahan bakar bagi pesawat dengan mesin piston. Pesawat tipe ini pada umumnya banyak digunakan untuk pelatihan terbang hingga untuk penyemprotan tanaman. Banyak peneliti yang telah membahas mengenai bahan bakar ini. Namun, masih belum ditemukan mengenai pengujian kecepatan pembakaran (SL) dan tinggi api laminar premix menggunakan metode bunsen burner. Oleh karena itu penelitian ini membahas mengenai studi kecepatan pembakaran laminar dan tinggi api premix avgas 100 LL dengan memvariasikan ekuivalen rasio dari 0,8; 1,0 dan 1,2. Pada penelitian ini ditemukan bahwa kecepatan pembakaran tertinggi didapatkan pada ekuivalen rasio 1,0 yakni 49,31 cm/detik. Namun pada pengujian tinggi api, ekuivalen rasio 1,0 menghasilkan nilai tingi api terendah yakni 6,303 mm. Hal ini disebabkan karena nilai maksimum kecepatan pembakaran umumnya tercapai pada rasio stoikiometrik, yang menandakan saat bahan bakar dan udara dicampur dalam proporsi yang tepat untuk pembakaran sempurna. Dengan pembakaran campuran bahan bakar-udara yang mendekati stokiometri ini maka menyebabkan nilai tinggi api semakin rendah. Fenomena ini terjadi karena tinggi api terkait erat dengan konsumsi penuh uap bahan bakar, Sehingga, tinggi api mencapai titik akhir ketika semua bahan bakar yang menguap telah terbakar habis.
Characterization of Combustion in Cylindrical Meso-Scale Combustor with Wire Mesh Flame Holder as Initiation of Energy Source for Future Vehicles Sanata, Andi; Ilminnafik, Nasrul; Asyhar, Muhammad Maulana; Nanlohy, Hendry Y.; Kristianta, Franciscus Xaverius; Sholahuddin, Imam
Automotive Experiences Vol 7 No 1 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10715

Abstract

The research aims to analyze and reveal combustion characteristics in a Cylindrical Meso Scale (CMS) Combustor with a wire mesh flame holder as a reference for designing a compact, efficient, and high-density energy source for future vehicles. This experiment analyzes the combustion ’s of a butane gas (C4H10)-air mixture in a cylindrical meso-scale (CMS) combustor with the addition of wire mesh flame holder on the stability of the combustion flame, as initiation of future vehicle energy source. The diameter of the CMS combustor with wire mesh flame holder is varied to give an idea of the effect of heat loss on the combustion flame's characteristics. The results show that the wire mesh as a flame holder is essential in the combustion stabilization mechanism. A stable flame can be stabilized in a CMS combustor with wire mesh. Variations in the diameter of the CMS combustor will result in variations in the surface-to-volume ratio, heat loss, and contact area of the wire mesh flame holder. At a large diameter, it produces the characteristics of a combustion flame with a more stable flame stability limit than a smaller diameter, a dimmer flame visualization than a smaller diameter at the same air and fuel discharge, a more distributed flame mode map area than the smaller diameter, lower flame temperature and combustor wall temperature than the smaller diameter, and relatively higher energy output than the smaller diameter.
Pengukuran Intensitas Radiasi Matahari di Wilayah Kabupaten Nganjuk Tahun 2016 Mubiyn, Shidqi Nur; Ilminnafik, Nasrul
Jurnal Energi Baru dan Terbarukan Vol 5, No 1 (2024): Maret 2024
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jebt.2024.21580

Abstract

Radiasi matahari merupakan faktor alam yang sangat penting bagi kehidupan manusia dan lingkungan. Radiasi matahari berperan dalam berbagai aspek kehidupan sehari-hari, termasuk mendorong pertumbuhan tanaman, memberi daya pada pembangkit listrik tenaga surya, dan berdampak signifikan terhadap kondisi atmosfer, iklim, dan cuaca di berbagai wilayah di dunia. Radiasi matahari juga berperan dalam berbagai aspek sains, seperti fisika, meteorologi, dan ekologi. Metode pengambilan data adalah langkah kunci dalam penelitian yang berfokus pada penggunaan sumber data dari website Photovoltaic Geographical Information System (PGIS). PGIS adalah sumber data yang sangat penting dalam studi ini karena menyediakan informasi terkini tentang sebaran sistem fotovoltaik (PV) di Kabupaten Nganjuk. Metode pengambilan data yang tepat akan memastikan bahwa data yang digunakan dalam penelitian ini akurat dan relevan. Pada tahun 2016, nilai rata-rata akumulasi radiasi gobal pada Kabupaten Nganjuk mencapai 156,21 kW/m2. Tingkat radiasi ini mencerminkan potensi energi surya yang dapat dihasilkan di Kabupaten Nganjuk. Dalam hal produksi energi surya, terjadinya hujan dan tutupan awan, terutama pada musim hujan dapat menjadi tantangan dalam input data. Beberapa wilayah seperti Nganjuk radiasi maksimum tercapai di musim kemarau. Fenomena yang terjadi pada Kabupaten Nganjuk menunjukkan bahwa radiasi matahari mencapai puncaknya pada bulan Agustus yang mencapai 180,67kWH/m2. Pengamatan ini menjadi penting untuk memberikan kontribusi dalam pemahaman mengenai variasi musiman radiasi matahari di wilayah Kabupaten Nganjuk serta menjadi dasar informasi yang penting untuk perencanaan dan pengembangan sumber energi surya.
Potensi Bioenergi Dari Pengolahan Limbah Peternakan Dan Sampah Organik Di Kabupaten Banyuwangi Kartini, Audiananti Meganandi; Ilminnafik, Nasrul
Jurnal Kendali Teknik dan Sains Vol. 2 No. 1 (2024): Januari : Jurnal Kendali Teknik dan Sains
Publisher : Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59581/jkts-widyakarya.v2i1.2720

Abstract

Banyuwangi Regency has an area of ​​5,782.5 km2, which is divided into 25 sub-districts and 217 villages/sub-districts with a population in 2021 reaching approximately 1,718,462 people. Based on BPS data from Banyuwangi Regency in 2020, it shows that the total livestock population is 3,130,769. These types of livestock consist of four-legged animals such as cows, buffalo, horses, goats, sheep, pigs and poultry such as chickens. The aim of this research is to find out the potential electrical energy obtained from livestock manure and to measure and identify the potential electrical energy from waste processing which is developed into a biomass power plant in Banyuwangi Regency. The research method in writing this article is descriptive quantitative, the data was obtained from literature studies. Biogas potential from the livestock sector in Banyuwangi Regency is considered high with a total of 297,680 m3 of biogas that can be produced. Meanwhile, the total weight of waste generated in Banyuwangi Regency is 572,261 kg/day. So it was found that the total bioenergy produced from livestock manure in Banyuwangi Regency reached 297,681 m3, while the total electrical energy produced from organic waste in Banyuwangi Regency reached 414,061 kWh per day.  
RASIO KEPADATAN UDARA TERHADAP PERILAKU FORMASI PENGABUTAN BAHAN BAKAR CAMPURAN BIODIESEL hakim, lukman; Noor, M. Fathuddin; Wahyudi, Djoko; Ilminnafik, Nasrul; Kurniawan, Eva
Mechonversio: Mechanical Engineering Journal Vol. 6 No. 2 (2023): DESEMBER 2023
Publisher : Univervitas Maarif Hasyim Latif

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51804/mmej.v6i2.16431

Abstract

Rasio kepadatan udara memiliki peran penting dalam pengabutan bahan bakar, Pengabutan bahan bakar yang baik mampu dengan cepat mengubah fase bahan bakar cair ke dalam bentuk gas. Tujuan penelitian ini mengamati karakteristik pengabutan bahan bakar campuran biodiesel dan etanol. Metode Penelitian menggunakan metode ekperimental, Komposisi bahan bakar adalah B30+E5 (B30 sebanyak 95% dan etanol 5%), B30+E7 (B30 sebanyak 93% dan etanol 7%). Kepadatan udara di atur menggunakan sensor tekanan udara Tegangan Kerja: 5.0 VDC, Tegangan Keluaran: 0,5-4,5 VDC, Tekanan Kerja: 0-0,5 MPa. Tekanan injeksi 14,7 bar, pompa injeksi menggunakan pompa injeksi otomatis, variasi tekanan kompresi udara 2 bar, 3 bar, dan 4 bar. Hasil Penelitian peningkatan kepadatan udara mengakibatkan panjang pengabutan menurun, sudut pengabutan meningkat dan kecepatan pengabutan menurun.
Co-Authors Achmad Aminudin Achmad Rifqi In'Amullah Adhe Reza Firmansyah Adhika Widyaparaga Agus Triono Ahmad Adib Rosadi Ahmad Adib Rosyadi Ahmad Iqbal Fawaid Ahmad Syuhri Ahmad Zainuri Alfariz, Mohammad Rifqy Alfian Futuhul Hadi Alfons Erick Perkasa Alfons Erick Perkasa, Alfons Erick Alief Muhammad Aliyansyah, Berly Amirul Yahya Andi Sanata Andi Sanata Apip Amrullah Arifin, Moch Miftahul Aris Zainul Muttaqin As’adi GA, As’adi Asyhar, Muhammad Maulana As’adi GA Atlanta Iwananda Audiananti Meganandi Kartini Cahya Alief Prasetyo Cahyani, Elisna Tirta Danang Yudistiro Danang, Yudistiro Dani Hari Tunggal Prasetiyo Dedi Dwilaksana Deny tomy andrianto Deny Tomy Andrianto Digdo Listyadi, Digdo Dimas Endrawan, Putra Djoko Wahyudi Dony Perdana Dwi Djumhariyanto Faiz Firdausi Fiqih Muhammad Firdausah, Risco Eka Firdiansyah, Alfian Freitas, Domingos de Sousa Frenico A.O. Fx. Kristianta Gaguk Jatisukamto GAMMA ADITYA RAHARDI Haidzar Nurdiansyah Halimatus Sa'diyah Halimatus Sa’diyah Hari Arbiantara Hari Arbiantara Basuki Hari Tunggal Prasetiyo, Dani Hary Sutjahjono Hendry Y. Nanlohy Ibnu, Muhammad Khadafi Imam Rudi Sugara Imam Sholahuddin Indro Pranoto Intan Hardiatama Ivan Bagus Sanjaya Junus, Sallahudin Kristianta, Franciscus Xaverius Kristianta, Fransiscus Xaverius Kurniawan, Eva Kustanto Muh. Nurkoyim Kustanto, Muh. Nurkoyim Luh Putu Ratna Sundari Lukman Hakim Lukman Hakim M Fahrur Rozy, Hentihu M Katibi Vanhas M. Agung Fauzi M. Agung Fauzi, M. Agung M. Fahrur Rozy Hentihu M. Fathuddin Noor, M. Fathuddin M. Katibi Vanhas Mahros Darsin Masruri Wardhana Meganandi Kartini, Audiananti Misto Misto Moch. Rizal A. Y. Moch. Rizal A. Y., Moch. Mochamad Asrofi Mochamad Edoward Ramadhan Moh. Nurkoyim Moh. Nurkoyim Kustanto Mubiyn, Shidqi Nur Muh Nurkoyim Kustanto Muh Nurkoyim Kustanto Muh. Nurkoyim Kustanto Muh. Nurkoyim, Kustanto Muhammad Dimyati Nashrullah Muhammad Lutfi Azis Muhammad Trifiananto Nasrullah, Muhammad Nur Cahyo Hidayat Nofal Kharis Nofal Kharis Kharis Nugraha, Raafi Aditya Nur Cahyo Hidayat Nasrullah, Muhammad Nur Widodo Nurkoyim Kustanto, Muh Puji Kristianto Putra Dimas Endrawan Putra, Dimas Endrawan Qoyinul Amin Reynaldi Akbar Ali Rika Dwi Hidayatul Qoryah Rima Zidni Karimatan Nisa Rizal Mahmud Rizal Mahmud Robertoes Koekoeh K.W. Salahuddin Junus Santoso Mulyadi Setyo Pambudi Setyo Pambudi Solahuddin, Imam Sumarji Syahriza, Mochamad Rifki Syuhri, Skriptyan N.H. Syuhri, Skriptyan Noor Hidayatullah Tanu Alifuddin D. S Taqdissillah, Doohan Wibowo, Robertoes Koekoeh Koentjoro Widyaningrum Febriolita wigo ardi winarko Wisnu Kuncoro yudan priyo anggono Yuni Hermawan