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All Journal Natural B Indonesian Journal of Pharmaceutical Science and Technology JP3 (Jurnal Pendidikan dan Profesi Pendidik) Science and Technology Indonesia Jurnal Sains Teknologi dan Lingkungan (JSTL) Jurnal Penelitian Pendidikan IPA (JPPIPA) Jukung (Jurnal Teknik Lingkungan) Jurnal Biologi Tropis JMM (Jurnal Masyarakat Mandiri) ORBITA: Jurnal Pendidikan dan Ilmu Fisika SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA Jurnal Pengabdian Magister Pendidikan IPA Jurnal Pendidikan Fisika dan Teknologi EIGEN MATHEMATICS JOURNAL Indonesian Physical Review Kappa Journal Informatika Jurnal Ilmiah Farmako Bahari Acta Chimica Asiana Jurnal Komunitas: Jurnal Pengabidian Kepada Masyarakat Jurnal Abdi Insani Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Jurnal Warta Desa (JWD) Jurnal Begawe Teknologi Informasi Kreasi: Jurnal Inovasi dan Pengabdian Kepada Masyaraka Jurnal Pepadu INSANTA: JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Pertambangan dan Lingkungan Journal of Technology, Mathematics and Social Science (J'THOMS) Journal of Fisheries & Marine Wahana Fisika : Jurnal Fisika dan Terapannya

Susi Rahayu

Program Studi Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Mataram

Author-ID : 440307

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Pemilahan Sampah Plastik Untuk Mendukung Program Zero Waste Pada Pusat Daur Ulang Sampah Bajang Peripih Doro, Pringgarata, Lombok Tengah Tahun 2021 Dian W. Kurniawidi; Teguh Ardianto; Syamsuddin; Siti Alaa'; Amrul Ikhsan; Susi Rahayu
Jurnal Pengabdian Magister Pendidikan IPA Vol 4 No 4 (2021)
Publisher : Universitas Mataram

Sampah plastik merupakan salah satu masalah serius di seluruh wilayah di Indonesia, apalagi pulau Lombok karena gugus pulau yang kecil. Dari berbagai jenis sampah, sampah plastik merupakan sampah non-organik yang paling banyak dihasilkan dan memiliki berbagai dampak bagi kesehatan dan lingkungan. Usaha mengurangi sampah dengan membuat Tempat Pembuangan Akhir, Tempat Pembuangan Sampah, dan Bank Sampah nampaknya perlu didukung oleh kesadaran masyarakat untuk mengurangi penggunaan sampah dan memilah sampah sehingga dapat mengurangi beban pengelolaan sampah yang dilakukan oleh pemerintah daerah. Pada kegiatan pengabdian kepada masyarakat kali ini dilakukan kegiatan pembimbingan, praktek lapangan dan sosialisasi kepada masyarakat ilmiah, mahasiswa dan alumni program studi pendidikan Fisika di Pusat Daur Ulang Bajang Peripih Doro di dusun Murbaya Desa Pringgarata Lombok Tengah yang telah melakukan kegiatan dengan hasil yaitu pembuatan paving block dari limbah plastik, pembuatan biofuel dari sampah plastik serta pembuatan batako. Limbah plastik yang digunakan didapatkan dari tempat pembuangan sampah masyarakat setempat, dengan memilih jenis limbah plastik low density polyethylene (LDPE), PET (polyethylene terepthalete), dan HDPE (high density polyethylene). Plastik jenis ini biasanya digunakan untuk membuat kantong plastik, plastik lembaran, bungkus makanan ringan, bungkus roti maupun kemasan-kemasan sejenisnya. Pembelajaran yang diperoleh menghasilkan uji coba sampel dengan nilai kuat tekan pada campuran limbah plastik 75% sebesar 8,2 MPa, dan penyerapan air sebesar 0,3109%. Sedangkan untuk pengujian bahan bakar diperoleh bahan bakar yang massa jenisnya 0,708 g/ml. Kelemahannya bahan bakar ini tidak ditemukannya senyawa oksigen yang dapat menyebabkan korosi pada mesin. Sehingga alternatif penggunaannya adalah pada industri pembakaran batu bata atau industri pengeringan tembakau.

THE THICKNESS OF A THIN FILM SYNTHESIZED FROM LIDAH MERTUA PLANT (SANSEVIERIA TRIFASCIATA) USING A DIP COATING METHOD Ervina Sandra Dewi; Siti Alaa; Dian Wijaya Kurniawidi; Susi Rahayu
Indonesian Physical Review Vol. 2 No. 3 (2019)
Publisher : Universitas Mataram

A study has been conducted on the characterization of optical properties of thin films from lidah mertua (Sansevieria trifasciata) with dip coating method. The dip coating method was applied with different temperature and different time immersion treatments. The measuring variables in the manufacture of this thin film were tested based on the optical properties of their absorbance value of the extract and the thicknessof thin film. The absorbance spectral of extraction pigments were measured using UV-Vis in the wavelength range 350 nm to 700 nm. The results of the measurements showed that the extract of the S. trifasciata has high absorbance. Beside that, the minimum coating thickness is produced by a concentration of 12.5% with a 5 minute immersion time of 520 nm.

THE STUDY OF GRAPHENE BAND GAP USING HATREE FOCK METHOD IN MOLECULAR SCALE Siti Alaa; Muhammad Fajrin; Eva Nurhaliza; Dian Wijaya Kurniawidi; Susi Rahayu; I Wayan Sudiarta
Indonesian Physical Review Vol. 3 No. 1 (2020)
Publisher : Universitas Mataram

Graphene is known as an advanced material that has good electrical conductivity and heat conductivity. To understand the nature of graphene it is necessary to calculate the energy, band gap and vibrate frequency at the nanoscale. One method that can be used is the ab initio calculation using the Hatree-Fock method. In this research, we performed a computational study of the electronic properties of grapheme within RHF/STO-3G basis set in different cluster molecules. From this study we get band gap for graphene in ab initio level, have a consistant value around zero. Using ab initio method, we can obtain a deeper understanding about the graphene behaviour at the molecular scale.

Effects of Polystyrene Solvent Difference on Morphology of Polystyrene Layers and Viscoelastic Properties of QCM Biosensors Susi Rahayu; Masruroh Masruroh; Djoko H Santjojo; Eka Rahmawati; Lalu A. Didik; Fadli Robiandi; Setyawan P Sakti
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

In this research, a modified QCM surface was done to improve the performance of QCM biosensors. This modification is done by coating polystyrene (Ps) on a QCM with toluena and chloroform solvents. The polystyrene coating was performed using spin coating technique, the measurement of surface roughness values using non-contact topography measurement system TMS 1200, and the viscoelastic properties was analyzed by using an electrical impedance. The analysis result using TMS 1200 shows morphologies of polystyrene produced with chloroform solvent have groovier and more porous compared to the toluena solvent. The roughness values of Ps surface with choroform and toluena is about 616.52 nm and 578.9 nm, respectively. The different surface roughness both of the solvent is caused by vapor pressure of each solvent. The vapor pressure value of chlorofrom solvent is 0.26 atm and toluena solvent of 0.037 atm. Moreover, using Sauerbrey equation is found mass of deposited ps produced with chloroform solvent is more than the toluena solvent. The mass of the polystyrene deposited on the surface of QCM with chloroform resulted about 2.23 × 10-5 ± 7.59 × 10-7 g and with toluena of 1.16 × 10-5 ±9.23 × 10-8 g. Furthermore, viscoelastic test show both polystirene layer are still rigid and have approximately 12.23 Ω impedance value. Therefore, the different solvents affect the surface morphologies of Ps.

Effect of Xylene and Tetrahydrofuran Solvent Type on Polystyrene Layer Thickness With Spin Coating Method Eka Rahmawati; Fadli Robiandi; Lalu A Didik; Susi Rahayu; Djoko H Santjojo; Setyawan P Sakti; Masruroh Masruroh
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Surface modification of QCM by applying polystyrene (Ps) as a coating layer has been investigated. The PS layer was coated onto QCM sensor by using spin coating method. Polystyrene was dissolved in two different solvents i.e., xylene and Tetrahydrofuran (THF) with various concentration i,e 1%, 2%, 3%, 4%, 5% and the velocity angular of spin coater were 1500 rpm, 2000 rpm, 2500 rpm, 3000 rpm, 3500 rpm, dan 4000 rpm. The results show that different solvent result in the difference of thickness of polystyrene coating layer. By calculation with the Sauerbrey equation, the thickness of Ps layer using xylene solvent show 0.1 µm, 0.28 µm, 0.35 µm, 0.59 µm, and 0.81 µm. While by using THF, the thickness of each Ps layer are 0.15 µm, 0.43 µm, 0.84 µm, 0.97 µm, 1.28 µm. On the other hand, by applying different velocity of spin coater, the thickness of polystyrene with xylene are 0.486 µm, 0.445 µm, 0.432 µm, 0.350 µm, 0.320 µm, 0,290 µm, respectively. Moreover, the thickness of PS layer by using THF show 1.05 µm, 0.93 µm, 0.87 µm, 0.84 µm, 0.67 µm, 0.52 µm. Vapor pressure of each solvent is considered as the main property of solvent which influence the thickness of coating. The vapor pressure of THF (143 mmHg) is higher than the vapor pressure of xylene (72 mmHg), the thickness Ps layer with THF is thicker than that of by xylene solvents.

Determination of Polystyrene Layer Thickness and Zinc Phthalocyanine (Znpc) with Modified Sauerbrey Equations and Scanning Electron Microscope (SEM) Lalu A Didik; Eka Rahmawati; Fadli Robiandi; Susi Rahayu; Abdurrouf Abdurrouf; Djoko H. Santjojo; Setyawan P. Sakti; Masruroh Masruroh
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

The thickness measurement of PS thin films on QCM surface and ZnPc layer on QCM/PS using Sauerbrey equation and Scanning Electron Microscope (SEM) has been investigated. Calculation result using a modified Sauerbrey equation show the thickness of PS layer and ZnPc one are 0,45 μm and 0,0676 μm respectively. Additionally the thickness measurement by using SEM shows the thickness of PS layer is 5,33 μm and the thickness of ZnPc layer is 10,44 μm. The differences thickness between Sauerbrey equation and SEM topograph is due to layers porosity. The topography of thin films produced by the secondary electron beam scanning allows to get a magnification of SEM image so that it can be measured directly. While the thickness calculation using the Sauerbrey equation is based on the change in the resonance frequency of QCM.

Effect of Deposition Rate on Morphology of Zinc Phthalocyanine Layer (ZnPc) on Polystyrene Surface / QCM with Vacuum Evaporation Process Fadli Robiandi; Lalu A Didik; Eka Rahmawati; Susi Rahayu; Masruroh Masruroh; Setyawan P. Sakti; Djoko H Santjojo
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Deposition of zinc phthalocyanine (ZnPc) layer on top polistiren surface by vacuum evaporation method has been investigated. PS layer was coated on QCM surface by spin coater and ZnPc layer was deposited on its surface by vacuum evaporator with three variation of deposition rate, i.e 1.39 ´ 10-4, 8.08 ´ 10-2 dan 7,41 ´ 10-1 μm/s. The morphology and surface roughness of ZnPc layer was observed by scanning electron microscope (SEM) and non-contact topography measurement system TMS-1200 TopMap. SEM image of ZnPc layer with deposition rate of 1.39 ´ 10-4, 8.08 ´ 10-2 and 7.41 ´ 10-1 μm/s shows porous and fibre like structure. The size of pores and fibre structures of ZnPc layer that produced by deposition rates of 1.39 x10-4 and 8.08 x10-2 μm/s is smaller than size of pores and fibre that produced by 7.41 ´ 10-1 μm/s. Moreover, increasing the deposition rate result a lot of ZnPc molecules make a bonding as fibrous result in the volume of fibrous increasing. Moreover, the increasing fibre size result pores volume increase. Therefore deposition rate can affect surface roughness, and roughness value is proportional to morphology of ZnPc layer. Based on result of TMS-1200 TopMap, the highest roughness level is 1310 nm, it’s found on the ZnPc layer that produced by deposition rate of 7,41 ´ 10-1 μm/s.

IMPLEMENTASI TEKNOLOGI FILTRASI AIR DENGAN KOMPOSIT DARI KARBON AKTIF DAN CALSIUM OXIDE UNTUK MENINGKATKAN KUALITAS AIR Dian W. Kurniawidi; Siti Alaa; Bakti Sukrisna; Syamsuddin Syamsuddin; Susi Rahayu
JMM (Jurnal Masyarakat Mandiri) Vol 4, No 5 (2020): November
Publisher : Universitas Muhammadiyah Mataram

Abstrak: Kualitas air merupakan bagian penting dari kualitas lingkungan. Integrasi antar kualitas air, kualitas tanah, dan kualitas udara menentukan keberlanjutan pertanian untuk kesejahteraan hidup. Permasalahan turunnya kualitas air di Desa Pelangan Kabupaten Lombok Barat terjadi akibat aktivitas penambangan konvensional wargase kitar. Sehingga perlu dilakukan suatu kegiatan workshop implementasi teknologi filtrasi air agar dapat dimanfaatkan warga untuk meningkatkan kesejahteraan hidup. Salah satu metode filtrasi air yang sederhana dan efektif adalah dengan menggunakan komposit dari karbon aktif dikombinasikan dengan calcium oxide. Adapun kegiatan tersebut dilakukan dengan tiga tahapan yaitu persiapan, pelaksanaan, dan evaluasi. Secara garis besar, metode pelaksanaannya antara lain sosialisasi prototype alat, pendampingan pembuatan alat dan komposit, serta uji cobaalat. Teknologi filtrasi telah disosialisasikan fungsi alat, cara pembuatan alat dan cara pembuatan kompositnya.Bahan baku pembuatan komposit yaitu karbon aktif dari kayu bakau dan calcium oxide dari cangkang kerang dara. Sedangkan pembuatan prototype alat filtrasi memanfaatkan pipa air. Hasil dari kegiatan ini, warga mampu membuat alat filtrasi air yang dapat meningkatkan kualitas air. Sehingga dengan bekal pengetahuan tersebut warga dapat memanfaatkan metode ini untuk memperoleh air layak pakai. Adapun air tersebut dapat digunakan untuk berbagai keperluan salah satunya untuk bercocok tanam guna memenuhi kebutuhan hidup. Abstract:Water quality plays an important role in a natural environment. The integration between the quality of the water, the soil and the air determine the sustainability of agriculture for welfare. The fundamental problem occured in Pelangan Village, West Lombok Regency due to conventional mining activities conducted by local residents is a reduction of the water quality. So it is necessary to carry out a workshop on the implementation of water filtration technology in order that it can be used by residents to improve their welfare. Asimple and effective way in a water purification process is to use a a composite of activated carbon combined with calcium oxide. The activity is arranged in three stages, namely preparation, implementation and evaluation. In general, the method of implementation includes socialization of tool prototypes, assistance in creating instruments and composites, and assessment tools. The filtration technology has been disseminated about itsfunction, how to create tools and how to produce composites. The raw materials for fabricating composites are activated carbon from mangroves and calcium oxide from virgin shells. Meanwhile, assembling a prototype of a filtration device utilizes a water pipe.As a result of this activity, local communities were able to make water filtration devices that can improve water quality. So that with this knowledge, residents can take advantage of this method to obtain suitable water for use. The water can be used for various purposes, one of which is for farming to fulfil the daily needs.

SINTESIS ZEOLIT DARI BATU APUNG (PUMICE) DAERAH IJOBALIT LOMBOK TIMUR SEBAGAI ADSORBEN LOGAM Fe Dian W. Kurniawidi; Siti Alaa; Sri Mulyani; Susi Rahayu
ORBITA: Jurnal Kajian, Inovasi dan Aplikasi Pendidikan Fisika Vol 7, No 2 (2021): November
Publisher : Universitas Muhammadiyah Mataram

ABSTRAKAktivitas letusan besar Gunung Api Samalas di Lombok meninggalkan jejak mineral batuan beku salah satunya batu apung (pumice). Batu apung memiliki komposisi mineral utama berupa silika sebanyak 58,3%. Tujuan dari penelitian untuk identifikasi karakteristik zeolit dari batu apung sebagai adsorben logam Fe. Zeolite disintesis menggunakan metode kopresipitasi. Identifikasi gugus fungsi, kristalinitas, dan struktur kristal zeolite sintesis menggunakan FTIR dan XRD. Sedangkan analisis adsorbsi menggunakan AAS. Zeolit berhasil terbentuk dari sintesis batu apung ditandai dengan kemunculan gugus fungsi TO4 dan gugus fungsi Si-O-Si pada panjang gelombang 983,85 cm-1 dan 660,02 cm-1. Zeolit yang terbentuk dari proses sintesis batu apung yaitu tipe zeolit ZK-14 dengan struktuk kristal kubik. Adapun hasil analisis kemampuan adsorbs dari zeolite ZK-14 ini sangat baik mencapai 99,22% pada komposisi Si/Al pada 25/30. Sehingga sintesis batub apung menjadi zeolite dapat diaplikasikan sebagai penyerap logam Fe. Kata kunci: Adsorben; Batu Apung; Zeolit. ABSTRACTThe massive eruption activity of the Samalas Volcano in Lombok left traces of igneous rock minerals, one of which was pumice. The pumice has a main mineral composition of 58.3% silica. The purpose of this study is to identify the characteristics of zeolite from pumice as an adsorbent of Fe metal. Zeolite has been synthesized using a coprecipitation method. The identification of functional groups, crystallinity, and crystal structure of synthetic zeolite using FTIR and XRD. Meanwhile, AAS was implemented for the adsorption analysis. The zeolite was successfully formed from the synthesis of pumice characterized by the appearance of the TO4 functional group and the Si-O-Si functional group at wavelengths of 983.85 cm-1 and 660.02 cm-1. The zeolite fabricated from the pumice synthesis process is ZK-14 type zeolite with a cubic crystal structure. The examination results from the adsorption ability of zeolite ZK-14 are very good, reaching 99.22% at the Si/Al composition at 25/30. In fact, the synthesis of pumice into zeolite can be applied as an absorber of Fe metal. Keywords: Adsorbent; Pumice Stone; Zeolite.

Pemanfaatan Limbah Cangkang Kerang Mutiara (Pinctada Maxima) Sebagai Sumber Hidroksiapatit Susi Rahayu; Dian W Kurniawidi; Abdul Gani
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 4 No 2 (2018): Juli-Desember 2018
Publisher : Department of Physics Education, Universitas Mataram

Pearl shells (pinctada maxima) are the superior commodities in West Nusa Tenggara Province. The shellfish is utilized as a producer of pearls while the waste of pearl shells has not been widely used by the community. Main composition of fhe pearl shells is calcium. CaO content was tested using AAS and obtained CaO in shells as much as 52.23%. CaO is used as a source of hydroxyapatite (HAp). Shellfish powder is synthesized with H3PO4 compound. Synthesis is conducted by precipitation method. Synthesis results were analyzed utilizing XRD and FTIR. From the examination, HAp compounds were identified. Group of PO43, CO32, and OH are constituent groups of HAp compounds. Moreover, another calcium phosphate is formedÃÂ namely TCP. This HAp compound has a maximum crystallinity of 78.33% at an angle of 77.18 ÃÂ°. The smallest HAp particle size at an angle of 31.92 ÃÂ° is 1.4 ÃÂ¼m. The degree of high crystallinity is influenced by high intensity and a wide FWHM. Meanwhile, the small molecule size is acquired on a wide FWHM with a small Bragg angle position.

Co-Authors ABDUL GANI abdurrouf Abdurrouf Afiatul Hafifah Agista, Wida Puteri Agus Saputra Agus Wahid H Ahmad Risandi F. Ahmad Taufik Ahmad Taufik S Akhyar, Halil Alaa', Siti Alaa, Siti Alaa, Siti Alaa`, Siti Alawiyah, Geby Alaydrus, Alfina T. Alaydrus, M. Mukaddam Alaydrus, Mukaddam Alda Berlian Alfina Alaydrus Alfina Taurida Alaydrus Alhadi, Kasnawi Alhaqiqi, Candra Alimuddin Alimuddin Amirrah, Reffa Amrul Ikhsan Amrulloh, Ashfia Andini, Mira Anggie Dwi P. Anggriani, Ni Ketut Ansyori, Maz Isa Arif Budianto Arif Budianto Arif Budianto Arum, Maysaroh Arzyl Akbar Baiq Niswatul Khair Baiq R. S. Yusuf Bakti Sukrisna Bambang Sumardjoko Cahyawati, Triyana Dyah Deasy Mariyani Desti Olga Safitri Destrianingtyas, Aulia Safitri Dewi Handayani Dewi, Diah L. Diah L. Dewi Dian W Kurniawidi Dian W. Kurniawidi Dian W. Kurniawidi Dian Wijaya Kurniawidi Dian Wijaya Kurniawidi Djoko H Santjojo Djoko H. Santjojo Dodi Mariadi Dona, Dona Dwiyansaputra, Ramaditia Eka Rahmawati Eka Rahmawati Enggar Juwanda K. Ervina Sandra Dewi Eva Nurhaliza Eva Nurhaliza Fadila, Naila Fadli Robiandi Fajarica, Shinta Desiyana Fajriah, Baiq Nurul Fajriyah, Putri Arifatul Fidya, Karina Alma Fitri Bimantoro Hadi, Kasnawi Al Halil Akhyar Hamidi, Mohammad Zaenuddin Handayana, I G N Yudi Handayana, I Gusti Ngurah Yudi Handayana, I Gusti Ngurah Yudi Hasanah, Khofizzatul Hendri Maradona, Hendri Hidayatullah, Kholik Hiden - Hiden Huan Ahmad T. Hurnah Hurnah, Hurnah Huwaida, Maitsa I Wayan Sudiarta Inatsa, Najma Intan Utami Intan Utami Isa A.A, Maz Iwan Sumarlan Jannah, Sahlli Jazuly, Zaky Juniarti, Rosita Kasnawi Al Hadi Khusnul Khotimah Kiki Yasdomi Kormil Saputra Kurniawidi, Dian W Kurniawidi, Dian W. Kurniawidi, Dian Wijaya Laeli, Ida Lahir, Sri Laili Mardiana Lalu A Didik Lalu A Didik Lalu A. Didik Lalu Sahrul Hudha Legi Aprila Lestari, Sintya Dewi Lily Maysari Angraini Liza Umitasari Mammi Dwi R. Mardiana, Laili Marlina, Resti Marzuki Marzuki Marzuki Marzuki Masruroh Masruroh Maulana, Sutan Fajri Meilani, Dini Moh. Bahtiar Muh. Alfaris Muhamad Ali Muhamad Ali Muhamad Ali Muhamad Amin Muhamad Amin Muhammad Fajrin Muhammad Maulana Nadila Rahmawati Nafsiatil Afro', Maulina Nurfadilah Nurfadilah Nurfadilah Nurhidayati Nurhidayati Nurlaili Nurlaili Nurmaulida, Siti Ema NURUL QOMARIYAH Oktri P, Awanda Pertiwi, Shavira Pranahita, Dewa Dwi Purnaning, Dyah Putraji, L.M. Guguh Ramadian Ridho Illahi Reza Alfian Ridwansyah, Habib Rohani Sayuti Rubi'ah, Siti S., RR. Delima Sabrina, Sovia sasabila, sasabila Septiani, Nonik Setyawan P Sakti Setyawan P. Sakti Shomad, Moh Abdul Sinta Devi Hariyanti Siti Alaa Siti Alaa Siti Alaa’ Sri Mulyani Suhayat Minardi Suhayat Minardi Sunita, Asfa Syamsuddin Syamsuddin Syamsuddin Syamsuddin Syamsuddin Teguh Ardianto, Teguh Thathit Suprayogi Utami, Urfi Wahana, Lidia Wahyudi, Sopian Ari Wardi, Palaivia Harman Wijaya Kurniawidi, Dian Wirawan, Rahadi Wirawan, Rahadi Zahrah Ramadlan Mubarokah

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