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All Journal BERKALA FISIKA Sainstek SEMIRATA 2015 Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Ilmiah Pendidikan Fisika Spektra: Jurnal Fisika dan Aplikasinya JURNAL EKSAKTA PENDIDIKAN (JEP) JURNAL PENDIDIKAN TAMBUSAI Jurnal Teori dan Aplikasi Fisika Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Pelita Eksakta Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Jurnal Humanities Pengabdian Kepada Masyarakat Jurnal Ilmiah Profesi Pendidikan Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika Journal of Comprehensive Science MASALIQ: Jurnal Pendidikan dan Sains Journal of Innovative Physics Teaching (JIPT) Journal of Climate Change Society Physics Learning and Education Journal of Experimental and Applied Physics

Yenni Darvina

Universias Negeri Padang

Author-ID : 2523034

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Environmental Science Health Professions Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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Analysis of Fe3O4 thin film optical properties prepared from the iron sand of Tiram Beach, Padang Pariaman Regency, West Sumatra using sol-gel spin coating method. Nidya Yulfriska; Ramli Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Research on magnetic oxide is growing very rapidly. This magnetic oxide can be found in nature that is iron sand. Iron sand is a deposition of sand containing iron ore that many exist along the beach. One of the beaches in West Sumatra containing iron sand is Tiram Beach, Padang Pariaman District, Sumatera Barat. The content of iron sand is generally in the form of magnetic minerals such as magnetite, hematite, and maghemit. Magnetite contained in iron sand has excellent properties that can be developed into thin films that can later be applied to magnetic sensors. The purpose of this research is to investigate the optical properties of the Fe3O4 thin films, prepared from iron sand of Tiram Beach, Padang Pariaman District, Sumatera Barat by Sol-Gel Spin Coating Method. This type of research is an experimental research. The iron sand obtained from nature is first purified using permanent magnets, then made in nanoparticle size using the HEM-E3D tool. Then, the process of making thin film with sol-gel spin coating method. In this research variation of rotation speed of spin coating is 1000 rpm, 2000 rpm, 2500 rpm and 3000 rpm. The characterization tool in the research of optical properties analysis used is UV-VIS Spectrophotometer. The value of transmittance is 32,1%, 32,2% and 32,7% respectively. The absorbance value is 96,721% - 31,247%, 95,428% - 33,785% and 93,54% - 33,551% respectively. While the reflectance values are 33,2%, 33,7% and 34,2%, respectively. So it can be concluded that the greater the speed of rotation the thickness of the thin layer will be smaller, resulting in the transmittance and reflectance will be greater, while the absorbance will be smaller. Energy gap obtained from this research is 3,75 eV, 3,75 eV and 3,74 eV. So the average energy gap obtained is 3,75 eV

Pengaruh komposisi CoFe2O4 terhadap sifat magnetik nanokomposit CoFe2O4/PVDF yang disintesis dengan metode sol gel (The effect of CoFe2O4 composition on the magnetic properties of the CoFe2O4 / PVDF nanocomposites synthesized by the sol gel method) Sovia Yulianti; - Ramli; - Yulkifli; Yenni Darvina
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cobalt Ferrite (CoFe2O4) is a magnetic material that has high coercivity, magnetic properties, and has electrical resistivity and high saturation magnetization, very suitable for applications in the field of magnetic, magnetic sensors, magnetic sensor constituents, biomedical materials, Magnetic Resonance Imaging (MRI) and hypertamia. The purpose of the survey is to explain the composition of the CoFe2O4 composition on the magnetic properties of the CoFe2O4 / PVDF nanocomposites synthesized by the Sol-Gel Method. There are three research results from vsm test data on hysteresis curves. First, the magnetization saturation data of each variation obtained results of 2.07 memu, 0.97 memu, 2.18 memu, 1.07 memu, and 0.91 memu. Second, the Remanent Magnetization data obtained results are 0.41 memu, 0.28 memu, 0.35 memu, 0.27 memu, and 0.16 memu. Third, the Medan Coercivity data is 208.31 Oe, 293.42 Oe, 163.20 Oe, 335.88 Oe, and 93.86 Oe.

Analysis of Fe3O4 thin film electrical properties prepared from iron sand at Tiram Beach, Padang Pariaman Regency, West Sumatra by using the sol-gel spin coating method Fitria Murti; Ramli Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is a country that has a considerable amount of mining products such as iron sand that can be found along the beach, one of them is the Tiram Beach in Padang Pariaman district, West Sumatera. Iron sand can be applied to electronics, computing, and the automotive industry sector because it contains magnetic material. Magnetite iron sand is iron oxidation which has the strongest magnetic characteristic, which is made in nano size has ferromagnetic characteristic and has a wide application, the development of ferrite materials in the form of thin layer oriented to recording media and also can be used as a magnetic sensor device. The research is to inquire effect spin coating velocity on conductivity of thin layer.In the research, variation of spin coating velocity 1000 rpm, 2000 rpm, and 3000 rpm are done with the time of 60 seconds toward magnetite gel solution which has been sol-gel, after rotated then the thin layer formed is measured by using four point probe method. The result from research obtained conductivity value that is on velocity 1000 , 2000, and 3000 rpm conductivity value shows that the effect of spin coating velocity on the magnetite thin layer conductivity that is the higher it is spin coating speed, the higher it is the conductivity

Pengaruh variasi komposisi serat tandan kosong sawit (TKS) dan serbuk kayu terhadap sifat fisis dan sifat mekanis papan partikel (The effect of variations in the composition of the fiber composition of the empty palm fruit bunches and sawdust on physical and mechanical properties of particleboard) Fadillah Ulfah; - Syakbaniah; Yenni Darvina
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This study aims to determine the effect variations composition of Palm Empty Fruit Bunch (EFB) and wood dust on the physical properties and mechanical properties of particle board. Particle board is made from EFB fiber and wood dust and added 30% adhesive. each particle boards have various compositions. In this study, the independent variable in the form of variations in the composition of the EFB fiber and wood dust that is 20: 80%, 40: 60%, 50: 50%, 60: 40%, 80%: 20%. The dependent variable in the form of physical properties such as moisture content, density, and mechanical properties such as flexural strength and compressive strength.. In general the values obtained physical and mechanical propertiesare density, flexural strength, compressive strength which is optimal in the variation 50% EFB : 50% wood dust, but the moisture content obtained optimal value at variation 40% EFB: 60% wood dust. All fulfill the SNI standard except for the value of the flexural strength

Analisis sifat listrik nanokomposit Fe3O4/PVDF yang disintesis dengan metode sol gel untuk aplikasi elektroda baterai lithium ion (Analysis of the electrical properties of Fe3O4 / PVDF nanocomposites synthesized by sol gel method for lithium ion battery electrode applications ) - Rahmi; - Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

As technology develops at this time, all electronic components require a voltage source. One source of voltage is the battery. West Sumatra is one area that is rich in eccentrics. Iron ore content in Tiram Beach in West Sumatra is 34.015%, followed by other elements as pollutants. However, basically there is still a lack of public knowledge about nano materials. Nano composite is a mixture of matrix and filler with a certain composition. This study aims to find out which is good for making lithium batteries. The requirement for making lithium batteries is high conductivity and high capacitance. At this time also look at the properties of fe3O4 nano compresses. Based on experiments that have been carried out will produce Fe3O4 and PVDF, the greater the value of electrical conductivity and capacitance will be. The conductivity values obtained were 437082.9 S / m, 8337755 S / m, 753969 S / m, 9300430 S / m, 1034708 S / m and the capacitance value was 35.94μF, 37.8 μF, 5.2 μF, 194 μF, 2.68 μF. Based on the results that can be used is a large amount of 10 ml: 30 ml.

Degradasi kualitas fisis air Danau Maninjau terhadap variasi jarak dan jumlah keramba (Degradation of the physical quality of water in Lake Maninjau with variations in distance and number of cages) Puput Mulya Sari; Yenni Darvina; - Hamdi
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The purpose of this research are to analys physical quality (temperature, pH, electrical conductivitas, turbiditas, and concentrasion of lead) at Maninjau Lake. Maninjau Lake has problem die of fish and make harm farmer of keramba. This research use variation of distance 0 m, 5 m and 10 m and three locations Bayua, Koto Gadang and Sigiran. The standart for physical quality, temperature 23-30 oC use Thermometry, turbiditas <5 NTU use Turbidimetry, pH 6-9, electrical conductivitas <250 µS/cm use Conductivity Metry and then concentration of Lead <0,03 mg/l use AAS. The result Bayua has worse the physical quality (temperature 31,0 oC, pH 5,6, electrical conductivitas 125,2 µS/cm, turbiditas 5,1 NTU, Lead 0,954142 mg/l). While Koto Gadang (temperature 29,5 oC, pH 7,1, conductivitas 123,1 µS/cm, turbiditas 4,8 and concentrasion of lead 0,3778 mg/l) has worse the physical quality than Sigiran (temperature 27,5 oC, pH 7,5, conductivitas 99,7 µS/cm, tur

Pengaruh komposisi MnFe2O4 terhadap sifat listrik nanokomposit MnFe2O4/ PVDF yang disintesis dengan metode spin coating (The effect of MnFe2O4 composition on the electrical properties of MnFe2O4 / PVDF nanocomposites synthesized by the spin coating method) Onny Gustira; Yenni Darvina; - Ramli
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Manganese ferrite (MnFe2O4) has an MnFe2O4 structure in which its manufacture uses manganese mineral powder. MnFe2O4/ PVDF nanocomposites are made in the form of thin films to see the electrical properties that are affected by variations in composition. MnFe2O4/ PVDF nanocomposites were characterized using XRD, FTIR and FPP. The XRD characterization results show that the Monoclinic Crystalline form for PVDF and Cubic for MnFe2O4, the angular value of 2θ formed is the greater the composition of MnFe2O4 from small to large used, then MnFe2O4 and PVDF are already present in the MnFe2O4/ PVDF angles which are seen in the composition of MnFe2O4 from small to large used, then MnFe2O4 and PVDF are already present in MnFe2O4 / PVDF diffraction peak. FTIR characterization results can be seen that MnFe2O4 successfully binds to PVDF, where Fe-O is a functional group MnFe2O4 and CH2 is a PVDF functional group. The results of the FPP characterization show that if the MnFe2O4 composition is getting bigger and the PVDF composition is getting smaller, the resistivity value is small and the conductivity value is greater.

Pengaruh pengukuran sifat fisis dan sifat mekanis papan partikel sampah daun kering berdasarkan ukuran butir (The effect of measuring the physical properties and mechanical properties of the dry leaf waste particleboard based on grain size) Ade Usra Berli; Yenni Darvina; - Yulkifli
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Utilization of leaf waste processed a drop of without development in the processing. The thought of leaf waste can be processed to become products of economic value, one used as raw material similar lightweight particle board, particle board can be used as a substitute for wood. Particle board manufacturing is done by printing the leaf waste that has been mixed with a binder or adhesive. Adhesives used as binder is polyvinyl acetate (PVAC). Leaf waste material made with a variety of different grain sizes are 1.7 mm, 2.8 mm and 4.75 mm. Particle board manufacturing process is done by inserting the material into the machine hot press with pressure 330 x 104 kg/m2 at 100 ° C for 20 min. From the testing of physical and mechanical properties, obtained the following results: for the physical properties of particle board dry leaf waste, the small grain size of particle board then dried leaf waste moisture content decreases while the value of the density and thickness development is increasing. For the mechanical properties of particle board, the small grain size of particle board then the value of flexural strength and compressive strength increased. Test results obtained water content and density to meet the Standar Nasional Indonesia (SNI 03-2105-2006), while the value of developing strong and thick flexible does not meet the Indonesian National Standard (SNI 03-2105-2006). For compressive strength values no set of Standar Nasional Indonesia. Grain size optimal particle board in this study is the size of a small grain size of 1.70 mm. Keywords: Leaf of Mangoes, polyvinyl acetate (PVAc), Particle board

Optimalisasi temperatur kalsinasi untuk mendapatkan kalsit-CaCO3 dalam cangkang pensi (Corbicula moltkiana) yang terdapat di Danau Maninjau (Optimization of calcination temperature to obtain calcite-CaCO3 in pensi shells (Corbicula moltkiana) found in Lake Maninjau) Suci Wahyuni; Yenni Darvina; - Ramli
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The utilization of pensi (Corbicula moltkiana) shell waste in Maninjau lake is not optimal so that we need an effort to make it has economic value. One of them is using calcium carbonate in pensi shell. Calcite is one of calcium carbonate polymorphs are often used in industrial paint, paper, ink, and other chemical industries. This experiment aims to determine optimum of calcination temperature to obtain calcite in pensi shell can be exploited and has economic value. The method that used is by giving calcination temperature of 300˚C, 320˚C, 340˚C, 360˚C, 380˚C, dan 400˚C to pensi shell and then characterized using XRF and XRD. Result of characterization using XRF show that pensi shell containe calcium element is 93,207% dan about 6% of other elements such as Si, Al, Ag, Mg, P, dan Fe. The result of characterizaion using XRD that compared with the ICDD database show that calcite phase has Rombhohedral structure with unit cell a = 4,9590Å, b = 7.9680Å, and c = 5.4710Å. Based of analysis can be concluded that the increase in temperature causes increasing intensity of calcite and dominant temperature to obtaine calcite phase at 400˚C

Rancangan Laboratorum Virtual untuk Pembelajaran Fisika SMA Masril Masril; Hidayati Hidayati; Yenni Darvina
JURNAL EKSAKTA PENDIDIKAN (JEP) Vol 2 No 1 (2018): JEP : Jurnal Eksakta Pendidikan
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jep/vol2-iss1/139

One of the problems found in the implementation of the curriculum of 2013 is not all competency skills can be performed well. Therefore, to overcome these problems, virtual laboratory designed to competencies skill of physics. One of the design objectives virtual laboratory is to improve the quality of education and learning in physics in high school. The method used in this study is a research method development four D model with the definition phase , design phase , development phase, and dissemination phase. Research has reached the stage of development and has been tested valid specialist. The instrument used in the research is a questionnaire consisting of: 1) the material substance; 2) The display of visual communication; 3) instructional design; 4) the use of software; and 5) Linguistic. The results obtained to test the validity in general has been very good category (85.6), so that the design of virtual labs designed can already be used in high school.

Co-Authors - Afrizal - Rahmi - Ramli - Ramli - Syakbaniah - Yulkifli - Yulkifli Abdul Azis Abdul Aziz Ade Aprilia Ade Usra Berli Afdatul Zikri Ahmad Fauzi Aifah Fauziah Akmam Akmam Alif Yulanda Putri Almunazar, Fauziyah Alqadri, Dheo Alwi Nofriandi Amali Putra Ambran Hartono amira tiara wulandari Andari Oktafiani Anisa Meysi Wardi Annisa Febriani, Annisa Anofa Liona Anwar, Suci Aprilia Cahaya Ari Arfandi arifaldi arifaldi Asfaha, Auzha Hira Asrad Hafizah Asrizal Asrizal Asrizal Atika Dwi Maharani Zuler Audia, Washilla Aulia, Mhd Reyfanza Aulia Azca Aryadiva Mahengga Azura Carolina Harsani Azzahra, Zakia Bella Salsa Bella Sukma Putri Chairunnas Chairunnas Cici Ramayanti Dara Putri Pratama Desnita Desra Yarsina Dicko Maulana Syahdan Diffa Azilia Dila Alhumaira Dola Afriyenti Edi Sanjaya Elsa Imelda Elsa Okta Memori Elsa Rahmayuni everly aberta Fadhila Ulfa Jhora Fadilla Septiani Fadillah Ulfah Fakhrur Rhozy Fani, Meylin Sir Fanny Rahmatina Rahim Fatni Mufit Fatni Mutfit Fauziyah, Faadhilah Febrian Syah Febrian, Nanda Festiyed Fio Adella Illahi Firda Annisa Fitrah Ayu fitri rahmi Fitria Murti Fran Surya Andi Fredy Pratama Frima Suci Agustia Fuja Novitra Gina Fadilah NST Gusnedi Gusnedi Gusnedi Gusnedi Gusnedi, - Gustika Yonanda Hamdi Rifai Hardina, Yuli Harman Amir Hasya Syahmi Hazrati Ashel Hersha Hanifa Hidayati Hidayati Hidayati Hidayati Hidayati Hidayati Hifzi, Zudiya Hilmi Rizki Anjani Hrp, Abdul Maulub Hufri Hufri Ihsania Ikrima Kinanti Ilahi, Fitratul Indah Safira Indah Septia Ningsih Indah Tri Handini Indri Syukra Innes Andriani Iryani Iryani Ismathul Dinny Jasmine, Alifa Jhora, Fadhila Jhora, Fadhila Ulfa Jhora, Fadhilla Ulfa Kasih Syirpia Khairunnisa Khairunnisa Kuwat Triyana Lestra, Dila Ayu Letmi Dwiridal Lidya Agraini Lucya Sinurat Lusi Oktavia masril masril Masril Masril Masril Masril Masril Masril Masril Masril Melani Alvino Miftahurrahmah Miftahurrahmah, Miftahurrahmah Muhammad Ikmal Muhammad Rivai Murtiani Murtiani Murtiani Murtiani Mustika, Dian Putri mutia faizah apriani Mutia Risma Mutia Yussavel Navis Nabila, Aliya Nadia Ardianti Nadia Ramadhanty Nadila Putri Bungsu Nadya Aztifa Nadya Yunestika Nawiyah, Nawiyah Nazifah, Naurah Nia Nursurila Nidya Yulfriska Nidya Yulfriska Novelia Prima Nur Anisa Nur Sahfitri Nurhasanah Nurhasanah Nurhijjah Tiur S Nurmala Sari Lubis Oktavia, Vini Onny Gustira Pakhrur Razi Pertama, Indri Saputri Pratama, Rayvol Dion Pratiwi Mailisa Prima Nora Ananda Puput Mulya Sari Pusri Mela Putra Adil Putra, Amali Putri Diana Putri Dwi Sundari Putri Rasti Ramadhani Radha Firaina Rahma Tilla Dwi Lestari Rahma Yeni Rahmadini, Fadhilla Rahmat Hidayat Rahmat Hidayat Rahmi Zulva Ramadhani, Dinda Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli Ramli, - Rara Nur Rida M.Y Ratnawulan . Renol Afrizon Resti Novela Retna Junia Revi Febrina Sari Ria Monica Rifi Wasrika Rima Melani Putri Rio Anshari Riolin Putri Artiwi Riri Jonuarti Riri Raihannil Jannah Riyasni, Selma rizka fauziah Rizki Rizki Romizah Marta Salma Amalia As Shidiq Santika, Viera Alvio Sari, Mona Berlian Septia, Zahwa Setivawani, Andrisa Shinta Kumala Silmi Hidayatullah03 Silvi Trisna Silvi Yulia Sari Siti Riva Darwata Slivi Yulia Sari Solly Aryza Sonia Nur Riza Sovia Yulianti Srisa Oktaweri Suci Wahyuni Suherman, Dea Stivani Suryani Fadhilah Syafri, Syafri Syafriani - - Syafriani Syafriani Syafriani Syafriani Syafriani Syafriani Syafrinaldi Syafrinaldi Syahputra , Ilham Syair Nandi Tiwi Novalia Syahari Tri Agunaisy Tria Sukma Sandi Trio Junira Fernando Ulfa Jhora, Fadhila Ulfa Jhora, Fadhilla Ully Nuraidina Ummiatul Fitri Vanessa Febta Sindani Varadila Sahanaya wahyu dilla abdullah Wahyudil Hayat wahyuni hafnisyah Wahyuni Satria Dewi Widara, Rofifah Windri Suci Gaitari Yeni Mustika Sari Yogi Putra Yohandri Yohandri Bow Yolvi Oktaviani Yona Sri Mantia Yosi Febriani Yudha, Fauzan Syafril Yulhendri Yulhendri Yulia Febrina Yulia Sari, Silvi Yulkifi Yulkifi Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli Yulkifli, Y Yunita Ela Saputri Yuri Yanti Yurnetti Yurnetti Yurnetti Yurnetti Yurnetti, Yurnetti Zakiya, Zara Zara Zakiya Zoni, Muhammad Ari Zulhendri Kamus Zulma, Degito

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