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All Journal Jurnal Penelitian dan Pembelajaran Fisika Jurnal Pendidikan IPA Indonesia Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Science and Technology Indonesia JIPF (Jurnal Ilmu Pendidikan Fisika) Jurnal Penelitian Pendidikan IPA (JPPIPA) Momentum: Physics Education Journal JURNAL EKSAKTA PENDIDIKAN (JEP) JPF : JURNAL PENDIDIKAN FISIKA JURNAL PENDIDIKAN TAMBUSAI International Journal of Educational Dynamics (IJEDS) Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Lentera Pendidikan Pusat Penelitian LPPM UM Metro JURNAL PENDIDIKAN MIPA Pelita Eksakta Jurnal Ilmiah Profesi Pendidikan Natural Science: Jurnal Penelitian Bidang IPA dan Pendidikan IPA Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Innovative Physics Teaching (JIPT) Physics Learning and Education Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Experimental and Applied Physics

Ratnawulan .

Departement Of Physics, Universitas Negeri Padang, Padang, 25132, Indonesia

Author-ID : 3501882

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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PENGARUH PENERAPAN LKPD BERBASIS PENDEKATAN SAVI (SOMATIC AUDITORY VISUAL INTELEGENCY) DALAM PEMBELAJARAN IPA TERPADU TIPE CONNECTED TERHADAP PENCAPAIAN KOMPETENSI IPA PESERTA DIDIK KELAS VIII SMPN 12 PADANG Annisa Kurniawati; Djusmaini Djamas; Ratnawulan Ratnawulan
PILLAR OF PHYSICS EDUCATION Vol 8 (2016)
Publisher : Universitas Negeri Padang

The lowness of students achievement in science competence is caused by several factors, such as the learning process which is still teacher-centered so that the students involvement in learning process is less and student worksheet which is used cannot motivate the students to learn. type connected approach on Integrated Science toward students achievement of IPA competence at class VIII SMPN 12 Padang. This experiment was quasi experiment. it used Randomizes Control Group Only Design. The population of the research is all student in grade VIII at the 2nd semester in SMPN 12 Padang in year of 2015/2016. The sampling technique of Purposive Sampling. Research sample was class VIII-4 as control class and VIII-7 as experimental class. Instruments used in this research were behavioral observation sheet to assess the behavior competency, written test to assess the knowledge and rubric to assess the skill competence. Data analysis technique used in this research was hypotheses test about the equality of two mean and, regression and correlation tests. The result of the analysis based on the research about the average score at the attitude competence, knowledge and skill from experiment group are 81,50; 76,49; and 79,48. On the other hand, the score from control group are 72,15; 59,48; and 74,28. From the two average test at attitude competence, it is obtained t observed = 2.68 and t table = 2.04; at knowledge competence, it is obtained t observed = 5,46 and t table = 2,04; and at skill competence,it is obtained t observed = 2,19 and t table = 2,00. At those three competences the scores obtained t observed > t table, which mean t observed are outside of Ho, therefore Hi are accepted. The level of student worksheet score toward the score of knowledge competence is medium and the effect of student worksheet is about 35,99%. Hence, the conclusion of the research shows that there is significant effect in using student worksheet based on SAVI approach in integrated science subject type of connected toward the achievement of science competence of students grade VIII SMPN 12 Padang

EFFECT OF COMPOSITION VARIATION ON CRYSTAL SIZE OF MnO-Fe₂O₃/PS NANOCOMPOSITE LAYER AS SELF CLEANING Dafri Zaldi; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11370171074

This research is based on the abundance of natural materials such as manganese and iron ore. Manganese is usually used for metal coating and has durability so that it is rich in properties to be used for various purposes in the chemical, pharmaceutical, and technological industries. Meanwhile, iron ore is a stable type of oxide so that it has strong properties and is not easily corroded. This research is a type of experimental research conducted at the Laboratory of Material Physics and Biophysics Faculty of Mathematics and Natural Sciences (FMIPA), Padang State University (UNP), and the Chemistry Laboratory of FMIPA UNP. The tools used are HEM-3D, XRD, and UV-VIS. The precursors were prepared by varying the composition of the ratio of MnO-Fe₂O₃ and PS respectively 0,2:0,2:1 ; 0,4:0,4:1 ; 0,6:0,6:1 ; 0,8:0,8:1 ; 1:1:1. This coating is made by means of the spin coating method and uses a temperature of 60 ° using a oven. The results of this study are the maximum crystal size obtained in MnO is 61.26 nm, Fe₂O₃ is 50.45 nm, and MnO-Fe₂O₃ is 53.08 nm. Also, the maximum% degradation produced is 65.97% in a methyl orange solution, this shows that the MnO-Fe₂O₃/PS layer is well degraded. This degradation ability is known as self cleaning because it is able to break down dirt.

The Effect of Variation in SiMn/PS Nanocomposite Composition on Hydrophobic Properties Sisi Gusti Putri; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11961171074

Many researches on the synthesis of hydrophobic coatings have been carried out, but in use, the coating is easily scratched, easily damaged by contact with other objects and easy to corrode, thereby reducing the quality of the coating. This can hinder the application of hydrophobic coatings in industry and others. Therefore, it is necessary to develop a hydrophobic coating that is strong and durable and anti-corrosion so that it can improve the quality of a surface. For this reason, research is carried out by mixing a substrate that has anti-corrosion properties such as silica and is hard such as manganese in order to overcome the problems that occurred previously using the spin coating method. The precursor was made by adding 0.5 grams of polystyrene composition, with varying SiMn composition. The coating was carried out using the spin coating method and the calcination temperature was 60°C using an oven for 1 hour. The results of this study from the composition variation showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test. The largest contact angle at 50%:50% composition.

THE EFFECT OF VARIATIONS OF COMPOSITION OF FELSDPAR AND THE SHELL OF PENSI SHELL (Corbicula Moltkiana) FROM LAKE MANINJAU ON THE FLEXIBILITY OF DENTURE Arni Sopianti; Riri Jonuarti; - Ratnawulan; - Gusnedi
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12206171074

Utilization of waste pensi shells (Corbicula Moltkiana) in Lake Maninjau has not been fully optimal so that a more economical business is needed. One of them is the use of calcium oxide in pensi shells. Calcium oxide is one of the most commonly used calcium in the manufacture of dentures. This study aims to determine the value of the optimum flexural strength of the denture in order to obtain a higher quality denture material on the pensi shell that can be utilized and which has economic value. The method used is the experimental method. The sample used in this study with a size of 90 mm X 18 mm X 8 mm for testing flexibility / flexural strength. The total samples used in this study were 12 samples for testing the flexibility/flexural strength using a bending testing machine. For the use of pensi shell material, a calcination process was carried out at a temperature of 1000℃ on the pensi shell material and then characterized using XRF to determine the ingredients. The results of the characterization using XRF showed that pensi shells contain calcium elements of 97.121% and about 3% other elements such as Si, Al, P, Ag, Mn and Fe. Then the pensi shell material is mixed with other ingredients such as felsdpar, quartz, and kaolin. The material is mixed and then molded for flexural testing specimens. Based on the test results of this study, the highest flexibility value for denture samples was found in sample 4 with the most variations of pensi shell powder. The highest denture flexibility value is 25.778 MPa with a variation of 30 gram pensi shell powder in sample 4. The lowest denture flexibility value is 5.727 MPa with a variation of 0 gram pensi shell powder in sample 1. This is due to the addition of pensi shell powder. can increase the value of flexibility in dentures. The increase in the flexibility value was influenced by the CaO content obtained from the pensi shell powder.

Effect of ZrO2 addition on the NTC thermistor characteristics based on Fe2O3 from the mineral yarocyte Rosi Selfia Putri; Ratnawulan Ratnawulan; Dani Gustaman Syarif
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Ceramic pellet has been made for the Negative Thermal Coefficient (NTC) thermistor from Fe2O3 base material of yarosite mineral. The powder of Fe2O3and ZrO2 is mixed and then crushed until homogeneous for ± 30 minutes. The mixture of the powder is pressed with 60 ton/cm2 to form a pellet on the 8 mm diameter mold. The pellets are sintered at a temperature of 1200oC for 3 hours in a furnace with atmospheric air. The pellet from the sintering process is coated with silver as an electrode. Next will be characterized using XRD (X-Ray Diffractometer), SEM (Scan Electron Microscope) and electrical characterization. Based on the results of XRD analysis it is known that the ceramics formed with the addition of ZrO2 0% doping, ZrO2 1% and ZrO2 3% have hexagonal hematite structure. Grain size based on SEM analysis, for each addition of 0% doping, ZrO2 1% and ZrO2 3% respectively is 10.81 μm; 11.51 μm and 10.24 μm. Results of measurement of electrical resistance, thermistor constant value is 3322 K, 3645 K and 5873 K. Conclusion in this study is the addition of ZrO2 does not affect the crystal structure formed based on the analysis using XRD. Addition of ZrO2 into Fe2O3 ceramic causes the grain size is relatively unchanged significantly. Based on the measurement of lstric resistance, the greater the ZrO2 addition concentration, the greater the resistance value at room temperature and the resulting thermistor constant

THE EFFECT OF HYDROPHOBIC CALCINATION TEMPERATURE VARIATION OF SILICA / POLYSTYRENE COMPOSITE (SiO2 / PS) ON THE DURABILITY OF SELF CLEANING MATERIALS Dila Juliawati; Ratnawulan Ratnawulan
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11369171074

Nature possesses functional architectural and surface characteristics. The functional surface is one of the surfaces of taro or lotus leaves which has water-repellent (hydrophobic) properties. Water repellency is the ability to form on surfaces that escape from water (such as glass, ceramics, etc.). The purpose of this study was to determine the resistance of the surface layer on the SiO2/PS layer which is expected to be used for self-cleaning applications using calcination temperatures of 30oC, 60oC, 90oC, 140oC and 180oC for 1 hour using a furnace. This research is a type of experimental research conducted at the Material Physics Laboratory of FMIPA and the FMIPA Chemistry Laboratory, Universitas Negeri Padang (UNP). This study uses a HEM-3D (High Energy Milling Ellipse-3D Mention) tool. The precursor was made by giving the composition of 0.5 grams of polystyrene (PS) and 0.2 grams of silica powder. Coating is done by using the spin coating method and giving the calcination temperature using a furnace. The results of this study were the variations in the calcination temperature of the SiO2 / PS composite hydrophobic on the resistance of the coating showed a change in the contact angle. Largest contact angles at temperatures of 60oC and for durability using contact angle tests with a distance of several days. The change in the contact angle decreases greatly, but the value of the contact angle is greatest at 60oC.

Fabrication of a pressure gauge for the mosquito artery clamp based on the LJ12A3-4-Z / BX proximity sensor Novella Febriana; Yulkifli Yulkifli; Ratnawulan Ratnawulan
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This research aims to design and develop a pressure gauge on the mosquito arterial clamp based on LJ12A3-4-Z/BX proximity sensor and to determine the performance specifications and proximity sensor-based equipment specifications LJ12A3-4-Z / BX. This study was engineering. The data collection done by measured the direct and indirect measurement.. Direct measurements carried out on proximity sensor output npn type LJ12A3-Z / BX, while indirect measurements carried out to determine the accuracy and precision of the instrument pressure gauge. The data obtained through the measurement was analyzed in two ways, namely by statistics and graphs. Based on data analysis that has been done can be put forward three important results. First, spesification of system performance pressure gauges at the arterial clamp LJ12A3 proximity sensor-based mosquito-Z / BX consists of a mosquito artery clamps connected by a proximity sensor type LJ12A3 npn-Z / BX and a box. Second, used to process the input data and processing data of sensor measurement data by the Arduino Uno microcontroller was. Third, this sensor has a sensor that outputs a value inversely proportional to the frequency of the pressure on the clamps are used, with the slope of 0.386. Meanwhile, the coefficient of determination obtained a straight line approach around 0.876. The resulting clamping pressure is inversely proportional to the value of the slope of the graph of No - 1,074. Through with the near of straight line coefficient of determination of the chart of 0726

THE EFFECT OF ADDITIONAL SALT AND ACID ON THE HYDROPHOBIC LAYER OF NANOCOMPOSITE SILICA/POLYSTYRENE (SiO2/PS) ON THE STABILITY PROPERTIES OF UV Yola sri Wahyuni; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11350171074

In nature there is a phenomenon. Which this phenomenon can be seen in the lotus leaf and taro leaves. a phenomenon called hydropobic (water repellent) properties. This research is a previous research. On application, the hydrophobic coating will mostly break down quickly when applied outside or in harsh environments. So it is very important to develop a durable hydrophobic layer, especially the stability properties against Ultra Violet (Uv). Therefore, this study aims to see the effect of adding salt and acid to the hydrophobic silica / polystyrene nanocomposite (SiO2 / PS) layer on the stability of the Uv. with a polystyrene composition of 0.5 grams and 0.2 grams of silica powder and 0.4 grams of salt and 0.4 grams of acid. The coating method used is the spin coating method and the Uv stability test on the hydrophobic layer is done by drying the layers for one hour under direct sunlight. The results of this study were the contact angle measurements using imagej software, and the crystal grain size by SEM (Scanning electron microscop). UV stability can be seen by changing the contact angle in each sample where the contact angle that can be before irradiation is acid added salt (120.1490C), salt (100.3630C), acid (128.5910C), without mixture (133.6680C) ) and after irradiation is. Salt (92.970C), unmixed (98.1440C), acid added salt (92.1150C), acid (141.5750C). These results may indicate that acid coating is more likely to use hydrophobic / self-cleaning surfaces in harsh environments such as high Uv irradiation, and outdoor applications.

The Effect of Sintering Temperature on Hydrophobic Characteristic of Silica Manganese /Polystyrene (SiMn/PS) Nanocomposite Dian Septiana; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 2 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11958171074

Currently a lot of research has been done on hydrophobic layers, but in its application the layer is easily damaged and is not corrosion resistant. Therefore, this research intends to decide the effect of variations insintering temperature on the hydrophobic characteristic of SiMn/PS nanocomposite layers using a sintering temperature of 60oC,100oC,140oC,180oC and 200oC for 1 hour using a furnace.This research was conducted in the Material Physics Laboratoryof0theFacultyof0Mathematics and Natural Sciences and the Chemistry Laboratory of0th eFaculty of0Mathematics and Natural Sciences,Padang State University.This research uses HEM-3D (High Energy Milling Ellipse-3D Mention), XRD(X-RayDifraction) and0SEM (ScanningElectron Microscope) tools. The precursor was made by giving 0.5 grams of polystyrene, 0.2 grams of silica powder and 0.2 grams of manganese powder. Coating is done by spin coating method. The results of this research from the variation of the sintering temperature showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test.The highest contact angle is at a temperature of 600C.Currently a lot of research has been done on hydrophobic layers, but in its application the layer is easily damaged and is not corrosion resistant. Therefore, this research intends to decide the effect of variations in sintering temperature on the hydrophobic characteristic of SiMn/PS nanocomposite layers using a sintering temperature of 60oC, 100oC, 140oC, 180oC and 200oC for 1 hour using a furnace. This research was conducted in the Material Physics Laboratory0of0the0Faculty0of0Mathematics0and0Natural0Sciences and the Chemistry Laboratory0of0the0Faculty0of0Mathematics0and0Natural0Sciences, 0Padang0State0University.This research uses HEM-3D (High Energy Milling Ellipse-3D Mention), XRD0 (X-Ray0Difraction) 0and0SEM0(Scanning Electron Microscope) tools. The precursor was made by giving 0.5 grams of polystyrene, 0.2 grams of silica powder and 0.2 grams of manganese powder. Coating is done by spin coating method. The results of this research from the variation of the sintering temperature showed that the SiMn/PS nanocomposite layer was hydrophobic based on the contact angle test. The highest contact angle is at a temperature of 600C.

Synthesis and characterization of Al2O3 nanoparticles using sol gel method by chelating extracts of starfruit (Averrhoa bilimbi) for nanofluid applications Kharisma Marta Judenta; Ratnawulan Ratnawulan; Gustaman Syarif
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Nanofluid has better thermal characteristics and better heat transfer coefficient compared to conventional coolant fluid [6].This makes the nanofluids has potential as a good alternative coolant fluid compared conventional coolant fluid. Nanofluids are a mixture of basic fluids such as water with solid particles of size 1-100 nm (Nanoparticles). In this study the nanoparticles to be used are Al2O3. The synthesis of Al2O3 was conducted by sol gel using chelation of Averrhoa bilimbi with calcination temperature of 1100 for 3 hours. Al2O3 powder obtained then characterized by using XRD. Furthermore, Al2O3 nanoparticles mixed into 100 ml of distilled water with concentration variations 0,2%; 0,5% dan 0,8% and characterized using test equipment Viscosity, Zeta Potential meter and Critical Heat Flux (CHF). Results obtained in the study was the effect of the addition of Averrhoa bilimbi extract as chelating against nanoparticles of Al2O3 to prevent agglomeration/buildup on each other. XRD data showed that the Al2O3 nanoparticles has crystallite size of 10,40 nm. Then the effect of addition Al2O3 nanoparticle concentration that were suspended in 100 ml of distilled water to the value of fluid Viscosity, Zeta Potential and Critical Heat Flux.Viscosity increases with the addition of Al2O3 nanoparticle concentration, at the same temperature (27°C) of optimum viscosity value at 0.8% concentration of 0.9830 mPa.s. Meanwhile, the potential zeta value also increases with the addition of Al2O3 nanoparticle concentration. The zeta potential value is optimum at 0.8% concentration of 35 mV. Furthermore the value of CHF at a concentration of 0.2%; 0.5% and 0.8% were 17.29%; 77.04% and 76.70% for each. Overall the value of CHF increases with the addition of Al2O3 nanoparticle concentration

Co-Authors - Hamdi AA Sudharmawan, AA Abdul Aziz Adilla, Rika Afrilla, Sonya Ahmad Fauzi Ahmad Fauzi aisyah fadillah Akmam Akmam Al Naim, A. F. Almunazar, Fauziyah Amelia Roza Haqu Amirullah, Fajar Fikri Anisa Janna Anisa Surya Annisa Kurniawati Aprianti, Rika Aria Ulfa Aris Alfikri Arni Sopianti Asri Devialita Asrizal - Betty Mizarwan Bizar al furqan Dafri Zaldi Dani Gustaman Syarif Delianis Pringgenis Desnita Desti Yuspita Sari Deswita, Pipi Devana Dhiya Purnama Sari, Salsabila Dian Septiana Dila Juliawati Djusmaini Djamas Doni, Rahma Dwi Putri Ramadhani Elvira Diana. S Emiliannur Emiliannur Ernita Susanti Ernmaniati Ramli Fadhila Ulfa Jhora Fadli M Fanny Rahmatina Rahim Faridah Lisa Supian Fatni Mufit Fauzi Ahmad Muda Fauziyah, Faadhilah Febriona, Fhica Febriya, Dhea Fitri, Hidayatul Forni, Francesca Fran Surya Andi Fuad Sofaturahman Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gusriandi, Dedi Gustaman Syarif Gusti, Dian Arima Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hayyu Yumna Hidayat, Zaitul Hidayati Hidayati Hidayati Hidayati Hidayatul Lisma, Rahmi Hosman, N. J. Hufri Hufri I Made Arnawa Idam Arif Ilahi, Fitratul Intan Purnama Yani Ipal Ipal Irna Humairah Ismira, Ismira Izzati Salsabilla Madina Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Kharisma Marta Judenta Korry Nilyani Lailatul Rahmi Lathifa Zonesya Putri Letmi Dwiridal Letmi Dwiridal Lia Rifka Septiana M. Bayu Ihsan Maharani Erika Putri Maharani, M Maritza Syalsabilla Masril Masril Mayasari, Tantri Mira Syuriyani Mohd Azmi, M. S. Muhammad Ridwan Azizi Mutiara Kusuma Febriwanti nabila aulia rahma Nadia Raisa Aryani Nadiyyah, Khoirotun Najmiatul Fajri Naspin, Desi Ariyanti Nessa Aqila Novella Febriana Nur Azizah Nurhabibah Nasution Nurhayati Nurhayati PAT, Anggi Angelina PAT Angelina Putri Dwi Sundari Putri, Sri Fany Mulya Rahima Syabrina Sarmi Rahmad Efendi Rahmat Hidayat Rahmat Hidayat Rahmat Hidayat Raisa, Nadia Ramadhani, Dinda Ramli Ramli Renol Afrizon Renold Fernanda Retna Junia Rifka, Lia Riri Camara Putri Riri Jonuarti Riri Jonuarti Riri Yandari Rita Iranie Riyasni, Selma rizka fauziah Rizki Fernanda Rosa Ayuni Utami Rosi Selfia Putri Santika, Viera Alvio Saputri, Ririn Hustia Sarimai Sarimai Sarmi, Rahima Syabrina Septia, Zahwa Silvi Yulia Sari Sinthia Dwi Jayanti Sisi Gusti Putri Sofaturrohman, Fuad Suherman, Dea Stivani Sumanti, Syahputri Supian, F. L. Syafri Syafri Syafriani Syafriani Syafriani Syafriani, - Syahputra , Ilham Syakbaniah Syakbaniah Syalsabilla, Maritza Syuriyani, Mira Tho, S. W. Triana Dwi Restika Trisia Meidini, Ella Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Jhora, Fadila Urwatil Wuskha Usmeldi Usmeldi Vauzia, Vauzia Veni Wahyuni Vonny Tinedi Wardatul Ullya Widiasih, Widiasih Witriani Marvinatur Ihsan Wong, Y. Y. Yanna, Fitri Yedho Syahadha Yenni Darvina Yola sri Wahyuni Yuliani, Kurnia Dwi Yulianti, Lastri Yuliza Noerman, Kiki Yulkifli Yulkifli Yurnetti Yurnetti Zaitul Hidayat Zakirman Zaturrahmi Zaturrahmi Zoni, Muhammad Ari Zulhendra Zulhendra Zulhendri Kamus

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