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All Journal Jurnal Sains Materi Indonesia Rekayasa Mesin FLYWHEEL : Jurnal Teknik Mesin Untirta Jurnal Spektra Omega: Jurnal Fisika dan Pendidikan Fisika Jurnal Penelitian Karet Science and Technology Indonesia Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Journal of Chemistry Jurnal Elektronika dan Telekomunikasi Metalurgi JURNAL KAJIAN TEKNIK MESIN Jurnal Riset Sains dan Kimia Terapan Jurnal Konversi Energi dan Manufaktur Jurnal Ilmu Pengetahuan dan Teknologi (IPTEK) Automotive Experiences PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Makara Journal of Science Indonesian Journal of Physics (IJP) Aceh International Journal of Science and Technology Metalurgi AME (Aplikasi Mekanika dan Energi) : Jurnal Ilmiah Teknik Mesin Jurnal Sains Materi Indonesia
Bambang Soegijono
Departemen FMIPA, Universitas Indonesia
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MAGNET HIBRIDA BaFe12O19/Sm2Co17: SINTESIS DAN SIFAT KEMAGNETAN Erfan Handoko; Iwan Sugiharto; Zulkarnain Jalil; Bambang Soegijono
Jurnal Riset Sains dan Kimia Terapan Vol 3 No 1 (2013): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 3 Nomor 1 Juli 2013
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.046 KB)

Abstract

Dengan tujuan meningkatkan sifat kemagnetan barium heksaferat, BaFe12O19, disintesis magnet hibrida dengan mengkombinasi magnet Sm2Co17 melalui metode mechanical mixing. Proses perlakukan panas terhadap campuran serbuk magnet hibrida dalam suasana gas argon bertujuan untuk menghilangkan residual stress dan kristalisasi serbuk magnet. Analisis struktur kristal diketahui dengan difraksi sinar-X phillips radiasi K Co. Morfologi serbuk magnet hibrida diamati dengan scanning electron microscope SEM. Sifat kemagnetan diukur dengan Permagraph pada temperatur kamar dengan medan magnet luar maksimum 2 T. Hasil sintesis magnet hibrida menunjukkan bahwa terbentuk fasa baru dan terjadi penurunan magnetisasi saturasi Ms dan nilai magnetisasi sisa Mr setelah perlakuan panas. Namun koersivitas Hc meningkat dengan nilai maksimum 28,73 kA/m. Kata Kunci : Magnet hibrida, mechanical mixing, perlakuan panas, koersivitas. In order to enhance the magnetic properties of barium ferrite, BaFe12O19, synthesized hybrite magnet by combaining Sm2Co17 magnet and prepared by mechanical mixing method. The heat treatment of hybrite magnet powders in an argon gas atmosphere in order to release residual stress and crystallize magnet powders. The analysis of crystal structures was examined by X-Ray Diffractometer (XRD) Phillips with K Coradiation. Morphology of hybrite magnet was studied using a scanning electron microscope (SEM). The magnetic measurement is carried out by Permagraph at the room temperature with respect to the magnitude the applied field up to 2 T to find magnetic properties of hybrite magnet. The results show that the new phase is found and decrease saturation magnetization (Ms) and also remanen (Mr) after heat treatment. But The coercivity (Hc) is increased with the maximum of 28.73 kA/m. Keywords : Hybrite magnet, mechanical mixing, heat treatment, coersivity.
PENGARUH UKURAN PARTIKEL TERHADAP SIFAT KEMAGNETAN MATERIAL MAGNET KOMPOSIT BaFe12O19/aFe Erfan Handoko; Setia Budi; Bambang Soegijono
Jurnal Riset Sains dan Kimia Terapan Vol 3 No 2 (2013): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 3 Nomor 2 Desember 2013
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2239.233 KB) | DOI: 10.21009/JRSKT.032.02

Abstract

Pembentukan material magnet komposit yang terdiri serbuk barium heksaferat, BaFe12O19, dan serbuk besi BCC, aFe, dengan perbandingan 60:40 % berat telah dilakukan. Proses penghalusan ukuran partikel magnet komposit dengan menggunakan planetary ball mill (PBM) dalam suasana toluen selama 30 jam bertujuan untuk meningkatkan sifat kemagnetan. Identifikasi fasa magnet komposit diperoleh hasil pengukuran dengan difraksi sinar-X radiasi Ka Co. Foto morfologi bentuk partikel magnet komposit menggunakan scanning electron microscope (SEM) 5310LV Jeol pada perbesaran 2000 kali. Distribusi ukuran partikel diketahui dengan LS Particle Size Analyzer (PSA) Beckman Coulter dan sifat kemagnetan dianalisis dengan alat Permagraph pada temperatur kamar. Hasil pengukuran menunjukkan bahwa selama penghalusan ukuran partikel material magnet komposit melalui proses milling tidak terjadi dekomposisi fasa, distribusi ukuran serbuk cendrung menurun dengan bertambahnya waktu milling. Pengaruh terhadap sifat kemagnetan material magnet komposit BaFe12O19/aFe yang mengalami penurunan magnetisasi sisa atau remanen dari 0,32 T menjadi 0,15 T dan nilai koersivitas magnetik 228,3 kA/m menjadi 42,5 kA/m. Namun nilai magnetisasi saturasi cendrung meningkat dari 0,59 T menjadi 0,80 T.Kata Kunci : Magnet komposit, ukuran partikel, sifat kemagnetan, BaFe12O19/aFe. The formation of magnetic composite material by combaining barium hexaferrite, BaFe12O19, and aFe powder with 60:40 % wt ratio has been investigated. The refinement of particle size of composite magnet by using planetary ball mill (PBM) for 30 hours in toluena atmosphere in order to enhance the magnetic properties. Phase identification of magnetic composite was examined by X-Ray Diffractometer (XRD) Phillips with KaCo radiation. The morfology of magnetic composite particle was studied using a scanning electron microscope (SEM) 5310LV Jeol.The particle distribution is measured LS Particle Size Analyzer (PSA) Beckman Coulter and the magnetic properties is measured by Permagraph at the room temperature. The results show that in milling process, the phase decomposition is not found, and particle size distribution is decrease. Influence on magnetic properties of magnetic composite material BaFe12O19/aFe are decrease remanen (Mr) from 0,32 T to 0,15 T and also the coercivity (Hc) from 228,3 kA/m to 42,5 kA/m. But the saturation magnetization (Ms) increase from 0,59 T to 0,80 T.Keywords : Composite magnet, particle size, magnetic properties, BaFe12O19/aFe .
Effect of magnetic field on the behavior of Electrochemical oxidation of Aluminum in 3.5% NaCl solution Surya Darma; Sukarno Sukarno; Bambang Soegijono; Hamdan Akbar Notonegoro; Naila Mubarok
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume 8, Issue 1, April 2022
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fwl.v0i0.14703

Abstract

An irreversible electrochemical reaction from material interaction with the environment and causing degradation is known as corrosion. The electrolyte changes significantly affect the corrosion's reaction kinetics. Unknown factors and various notable factors influence the corrosion rate of a particular material in the environmental system. Significant interest in magnetic fields and their effects on electrochemical reactions have recently been gained. This paper studies the effect of an external magnetic field on the electrochemical oxidation of Aluminum (Al) in a 3,5% NaCl solution. The magnetic field 0; 0,8; 1,4; and 2,1 Tesla were used to expose the samples during corrosion testing. We found that the effect of a magnetic field on electrochemical oxidation shifts the oxidation potential to higher or lower than the oxidation potential without a magnetic field. Moreover, the oxidation potential's value depends on the magnetic field's intensity.
Pengaruh Suhu Tumbuh Terhadap Struktur Kristal Lapisan Tipis ZnO 0.02 mol Wisnu Purno Aji; Rizqon Priyotomo; Iwan Sugihartono; Erfan Handoko; Bambang Soegijono; M. Hikam
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 2 (2013): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2013
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

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Abstract

Telah dilakukan penumbuhan lapisan tipis ZnO 0.02 mol diatas substrat Si (111) menggunakan teknik Ultrasonic Spray Pyrolysis (USP) dengan suhu tumbuh 4000C, 4500C, dan 5000C. Serbuk Zn(CH3COO)2 . 2H2O digunakan sebagai larutan precursor dengan air de-ionisasi sebagai pelarut. Berdasarkan profil warna lapisan tipis ZnO yang tumbuh diatas substrate silikon diprediksikan memiliki ketebalan sekitar 200 nm. Sementara, hasil karakterisasi menggunakan X-Ray Diffraction (XRD) pada temperature ruang menunjukan bahwa fasa kristal yang terbentuk merupakan polikristal ZnO dengan intensitas spectrum XRD yang tidak linear dengan penambahan suhu tumbuh. Kata kunci: Lapisan Tipis, Ultrasonic Spray Pyrolysis (USP), Struktur Kristal.
Pengaruh Material Clay (Kaolinite/Illite) Terhadap Maturasi dan Potensi Material Organik Untuk Dasar Pengolahan Material Serpih Sebagai Energi Alternatif Pengganti BBM Ordas Dewanto; Bambang Soegijono; Suharso Suharso
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 2 (2013): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2013
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (187.733 KB)

Abstract

Material serpih atau material organik sejenisnya, masuk dalam kategori kerogen tipe II. Untuk mengembangkan dan membantu proses pengolahan atau pemanfaatan material organik tersebut, maka sangat perlu dilakukan penelitian yang lebih spesifik tentang material serpih berupa kelompok senyawa siklik/alifatik yang berakumulasi di dalam material clay tersebut. Material clay yang mengandung kaolinite/illite tentunya akan sangat mempengaruhi material organik tersebut, misalnya jumlah kandungan organik karbon dalam clay dan kematangan termalnya. Pengukuran tingkat kematangan termal material clay-organik dilakukan berdasarkan harga temperatur maksimum (Tmax) dari analisis pirolisis. Hasil dari analisis menunjukkan bahwa material clay dengan volume yang lebih besar dari pada material organik ternyata sangat berperan besar dalam proses maturasi. Kemudian jenis material clay yang didominasi oleh material karbonat, hasilnya menunjukkan penurunan pada proses maturasi. Selain itu ditentukan juga tipe material serpih menggunakan data pirolisis rock-eval. Kombinasi antara indeks hidrogen (HI) dan Tmax pada diagram van Krevelen menunjukkan kerogen tipe II yang lebih cenderung berpotensi sebagai minyak dan gas. Kata kunci: material serpih, kerogen, kaolinite/illite, siklik/alifatik, maturasi.
Effect of Tool Rotation Speed on Mechanical Properties and Microstructure as the Results of Friction Stir Welding Method on Aluminium 5083-7075 Maryati Maryati; Bambang Soegijono; M Yudi Masduky; Tarmizi Tarmizi
Indonesian Journal of Physics Vol 27 No 1 (2016): Vol 27 No 1 (2016), July 2016
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2229.061 KB) | DOI: 10.5614/itb.ijp.2016.27.1.2

Abstract

Friction Stir Welding (FSW) is a new method of welding process which is affordable and provide good quality. Aluminium 5083-7075 has been connected successfully by using friction stir welding (FSW) method into butt joint connection form. Tool rotation speed is one of the important parameters in FSW. The changes of rotation speed will affect the characteristics of mechanical properties and microstructure. The parameters of welding being used are welding speed of 29 mm/minutes by varying the speed rotation of 525 rpm, 680 rpm, 910 rpm, and 1555 rpm. In order to find out the mechanical strength of welds, tensile strength and hardness testing is done while finding out the microstructure will be done by using optical microscope and Scanning Electron Microscope (SEM). The result of the research showed that the highest tensile strength obtained at 910 rpm speed rotation about 244.85 MPa and the greatest hardness values was found on aluminium 5083 around the wheel zone area about 96 HV with rotary speed of 525 rpm. Then, the result of testing the macro and microstructure on all samples indicated defect which is seen as incomplete fusion and penetration causing the formation of onion rings. In other words, it is which showed that the result of stirring and tacking in the welding area is less than perfect.
The Hardness of Boride Layer on the S45C Iron (A preliminary study on surface hardening of ferrous material) Sutrisno S; Bambang Soegijono
Aceh International Journal of Science and Technology Vol 1, No 2 (2012): August 2012
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.574 KB) | DOI: 10.13170/aijst.1.2.126

Abstract

Abstract - The property such as microhardness of boridelayer formed on S45C iron was investigated. Boronizing was carried out in a solid medium consisting of nano size powders of 50% B4C as a donor, 45% SiC as a diluent, and 5% KBF4 as an activator treated at the temperature of 10000C for 8 hours. The phases that were formed on the substrate was found as Fe2B and FeB layer that had smooth and flate shape morphology. The hardness of boride layer on S45C was over 2000 HV, while the hardness of untreated S45C iron was about 196,39 HV. Depending on process time and temperature, the depth of boride layer ranges from 25 to 55 μm, leading to a diffusion controlled process.Keywords : Boronization, hard layer, heat treatment, B4C.KBF4.SiC powder, low carbon steel.
Pengaruh Penambahan Karbon Dan Nitrogen Terhadap Mikrostruktur, Kekuatan Tarik Dan Mampu Bentuk Paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni [Influence of Additional Carbon And Nitrogen on Microstructure, Tensile Strength And Workability of Co- 28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni] Fendy Rokhmanto; Bambang Soegijono; Ika Kartika
Metalurgi Vol 31, No 3 (2016): Metalurgi Vol. 31 No. 3 Desember 2016
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17436.428 KB) | DOI: 10.14203/metalurgi.v31i3.174

Abstract

Co-Cr-Mo alloys are widely used as bone and dental implant materials, where the composition of the alloy refers to the standard ASTM F75. Co-Cr-Mo alloys has good mechanical properties, biocompatibility and high corrosion resistance. Objective of this paper is to investigate the influence of Carbon and Nitrogen on tensile strength and workability of Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni when used to that applications. Carbon is added into the alloys of 0.08; 0.15 and 0.25 (% weight), whereas nitrogen at 0.2 (% weight). As cast ingot homogenized at 1200 °C for 6 h, and then hot rolled with preheating 1200 °C for 1 h and then water quenched. The alloys (as cast and after hot rolling) were characterized with optical microscope and SEM to investigate the microstructure and the tensile test to investigate the mechanical properties and fraktografi. The tensile strength of the alloy Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni increased with the addition of carbon in the alloy, while the addition of nitrogen increased work ability of Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni alloy.AbstrakPaduan Co-Cr-Mo banyak digunakan sebagi material implan tulang dan gigi, dimana komposisi paduan mengacu kepada standar material implan ASTM F75. Paduan Co-Cr-Mo memiliki sifat mekanis yang baik, bersifat biokompatibilitas dan memiliki ketahanan korosi yang tinggi. Tujuan penelitian ini adalah melihat pengaruh penambahan karbon dan nitrogen terhadap kekuatan tarik dan mampu bentuk paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni untuk memenuhi aplikasi di atas. Karbon ditambahkan ke dalam paduan sebesar 0,08; 0,15 dan 0,25 %berat, sedangkan nitrogen sebesar 0,2 %berat. Paduan hasil coran (as cast) kemudian dihomogenisasi pada temperatur 1200 °C selama 6 jam, lalu dilakukan prosess hot roll dengan pemanasan awal 1200 °C selama 1 jam dilanjutkan dengan quenching dalam media air. Paduan as cast maupun hasil hot roll kemudian diamati strukturnya dengan menggunakan mikroskop optik dan SEM serta dilakukan uji tarik untuk mengetahui sifat mekanik dan fraktografi patahan. Kekuatan tarik paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni meningkat seiring dengan meningkatnya penambahan karbon dalam paduan, sedangkan penambahan nitrogen meningkatkan mampu bentuk paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni. 
TINJAUAN PENGEMBANGAN MATERIAL BERBASIS BARIUM TITANAT, KOMPOSIT PVDF/BATIO3 DAN BATIO3/HAP UNTUK APLIKASI ELECTROSTATIC DIELECTRIC ENERGY STORAGE CAPACITOR Septian Rahmat Adnan; Budhy Kurniawan; Bambang Soegijono
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.v14i2.1423

Abstract

Barium titanate (BaTiO3) is ceramic material that is widely used in various applications..Electrostatic dielectric energy storage capacitor is one of the application of Barium titanate (BaTiO3) material. Composite materials based on barium titanate (BaTiO3) such as Polyvinylidene fluoride (PVDF)/BaTiO3 and BaTiO3/HAp Hydroxyapatite have been developed to improve the electrical properties of the materials. Many  research have been reported  hat barium titanate in nano phase has a maximum dielectric constant 5000 with particle size range of 30-50 nm. The addition of BaTiO3 composition as a filler to PVDF/BaTiO3 composite caused increasing of dielectric constant compared to the dielectric constant properties of the PVDF. Similar results also found on BaTiO3/HAp composite.  From this review, it was also found that the composite of these three materials is a candidate for future material to improve the electrical properties of PVDF which have been applied to electrostatic dielectric energy storage capacitor applications.
Characterization of Cr/Bentonite and HZSM-5 Zeolite as Catalysts for Ethanol Conversion to Biogasoline Widjaya, Robert Ronal; Soegijono, Bambang; Rinaldi, Nino
Makara Journal of Science Vol. 16, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The characterization on Cr/Bentonit and Zeolit HZSM-5 catalysts for ethanol catalytic process to biogasoline (equal to gasoline) has been done in this study. Cr/Bentonit has high acidity and resistant to a lot of moisture, in addition to being able to processing feed which a lot of moisture (>15%) from ethanol-water mixture, it is also not easy to deactivated. Cr/Bentonit which is then used as the catalyst material on the process of ethanol conversion to be biogasoline and the result was compared with catalyst HZSM-5 zeolite. Several characterization methods: X-ray diffraction, Brunauer Emmett Teller (BET), thermogravimetry analysis (TGA), and catalyst activity tests using catalytic Muffler instrument and gas chromatography-mass spectrometry (GC-MS) for product analysis were performed on both catalysts. From acidity measurement, it is known that acidity level of Cr/Bentonit is the highest and also from XRD result, it is known there is shift for 2theta in Cr/Bentonit, which indicates that Cr-pillar in the Bentonite can have interaction. It is also supported by BET data that shows the addition of specific surface are in Cr/Bentonite compared with natural Bentonite before pillarization. Futhermore catalyst activity test produced the results, analyzed by GC-MS, identified as butanol and also possibly formed hexanol, decane, dodecane, undecane, which are all included in gasoline range (C4 until C12).
Co-Authors A.A. Ketut Agung Cahyawan W Aditia Pradipta Adnan, Septian Rahmat Akmal Johan Ali, Nora'aini Andika W. Pramono Andri Suherman Anggrainy, Rani Arief Ramadhan Arief Ramadhan Arief Sudarmaji Arief Syarifuddin Fitrianto Arief Syarifuddin Fitrianto Aritonang, Sovian Arsali Arsali Asep Yudi Hercuadi Asep Yudi Hercuadi, Asep Yudi Azwar Manaf Basori Basori Bintoro Siswayanti Budhy Kurniawan Cahaya Rosyidan Caing Caing Chandra, Johannes Daniel Edbert, Daniel Decky J. Indrani Dhimas Satria Dona Sulistia Kusuma Dwi Nanto, Dwi Dwita Suastiyanti Edie Sasito, Edie Elman Panjaitan Emil Budianto Emil Budianto Erfan Handoko Evi Ulina Margaretha Situmorang Fendy Rokhmanto Ferry Budhi Susetyo Ferry Budhi Susetyo Ferry Budhi Susetyo Ganis Sanhaji, Ganis Gina Libria Nadjamoeddin Greida Frista Hamdan Akbar Notonegoro Hamdan Akbar Notonegoro Hamdan Akbar Notonegoro Hasanudin Gufron Fachrudin Ika Kartika Ika Kartika Isom Mudzakir, MSi. Iwan Sugiharto Iwan Sugihartono Jan Setiawan Kiky C. Sembiring Koji Yoneda Koji Yoneda, Koji Kurniawan, Ova La Ode Husein ZT La Ode Husein ZT, La Ode Lubi, Ahmad M Yudi Masduky M. Derajat Amperajaya M. Hikam M. Hikam Maman Kartaman Ajiriyanto Manawan, Maykel Maryati Maryati Maulani, Mustamina Maykel Manawan Moch Iqbal Zaelana Muttahar Mohammad Khotib Muhamad Farid Muhammad Hikam Muhammad Hikam, Muhammad Muhammad Irfan Faturrohman Muhammad Irfan Faturrohman, Muhammad Irfan Musfirah Cahaya Fajrah Musfirah Cahya Fajrah, Musfirah Cahya Nababan, Frederik Gresia Naila Mubarok Nazarudin Koto Nino Rinaldi Nofi Erni Notonegoro, Hamdan Akbar Ordas Dewanto Ova Kurniawan Pius Sebleku Putra, Valentinus Galih Vidia Rakhman Sarwono Raksa, Teguh Yoga Ramlan Ramlan Renanto Putra Wijaya Rizkynawan, Benridho Rizqon Priyotomo Rizqon Priyotomo, Rizqon Rokhmanto, Fendy Samura, Lisa Septian Rahmat Adnan Septian Rahmat Adnan Septian Rahmat Adnan Septian Rahmat Adnan, Septian Setia Budi Sofyan, Muhammad Azis Sovian Aritonang Sudaryanto Sudaryanto Suhariyanto Suhariyanto Suharso Suharso Suharso Suharso Sukarno Sukarno Surya Darma Susetyo, Ferry Budhi Sutrisno S Syamsuir, Syamsuir Tarmizi Tarmizi Taufiqur Rachman Wardah, Amirah Widjaya, Robert Ronal Wisnu Purno Aji Wisnu Purno Aji, Wisnu Yosef Sarwanto Yudanto, Sigit Dwi Zainal Alim Mas'ud Zainal Alim Mas’ud Zulkarnain Jalil Zulkarnain Jalil