Subjects -> PHYSICS (Total: 857 journals)
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PHYSICS (625 journals)            First | 1 2 3 4 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 36)
International Journal of Biological, Physical and Chemical Studies     Open Access  
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 7)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Engineering and Applied Physics     Open Access  
International Journal of Fatigue     Hybrid Journal   (Followers: 41)
International Journal of Fracture     Hybrid Journal   (Followers: 14)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 41)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 17)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 2)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 14)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 7)
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 11)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 12)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 3)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 15)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 12)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 14)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 13)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 13)
International Journal of Multiphysics     Open Access  
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal  
International Journal of Nanotechnology     Hybrid Journal   (Followers: 9)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 8)
International Journal of Nonlinear Dynamics and Control     Hybrid Journal   (Followers: 6)
International Journal of Physics     Open Access   (Followers: 10)
International Journal of PIXE     Hybrid Journal  
International Journal of Plasticity     Hybrid Journal   (Followers: 7)
International Journal of Quantum Information     Hybrid Journal   (Followers: 6)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal  
International Journal of Solids and Structures     Hybrid Journal   (Followers: 14)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 3)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 13)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 17)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 18)
International Journal on Smart Sensing and Intelligent Systems     Open Access  
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 8)
International Materials Reviews     Hybrid Journal   (Followers: 15)
Iranian Journal of Medical Physics     Open Access  
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jambura Physics Journal     Open Access  
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 10)
Journal of Advanced Physics     Full-text available via subscription   (Followers: 13)
Journal of Advances in Physics     Open Access   (Followers: 13)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 9)
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 7)
Journal of Applied Physics     Hybrid Journal   (Followers: 69)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 33)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 58)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 15)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 241)
Journal of Computational and Theoretical Transport     Hybrid Journal   (Followers: 2)
Journal of Computational Methods in Physics     Open Access   (Followers: 8)
Journal of Computational Physics     Hybrid Journal   (Followers: 59)
Journal of Computational Physics : X     Open Access   (Followers: 1)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 14)
Journal of Elasticity     Hybrid Journal   (Followers: 7)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 3)
Journal of Electronic Materials     Hybrid Journal   (Followers: 3)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 9)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 17)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 2)
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 4)
Journal of Experimental Physics     Open Access   (Followers: 3)
Journal of Fire Sciences     Hybrid Journal   (Followers: 6)
Journal of Geometry and Physics     Full-text available via subscription   (Followers: 2)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 134)
Journal of Gravity     Open Access   (Followers: 4)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 25)
Journal of High Energy Physics     Hybrid Journal   (Followers: 17)
Journal of High Energy Physics, Gravitation and Cosmology     Open Access   (Followers: 2)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 23)
Journal of Imaging     Open Access   (Followers: 3)
Journal of Information Display     Open Access   (Followers: 1)
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 8)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 14)
Journal of Low Frequency Noise, Vibration and Active Control     Open Access   (Followers: 8)
Journal of Luminescence     Hybrid Journal   (Followers: 2)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 22)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 7)
Journal of Materials Science     Hybrid Journal   (Followers: 25)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 2)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 1)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 10)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 25)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 24)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Motor Behavior     Hybrid Journal   (Followers: 8)
Journal of Multiscale Modeling     Hybrid Journal   (Followers: 1)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Nonlinear Dynamics     Open Access   (Followers: 6)
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 2)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access   (Followers: 5)
Journal of Optics     Hybrid Journal   (Followers: 17)
Journal of Photonics for Energy     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Hybrid Journal   (Followers: 48)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 18, SJR: 2.461, CiteScore: 3)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 8)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 22)
Journal of Porous Materials     Hybrid Journal   (Followers: 4)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal   (Followers: 3)
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 30)
Journal of Rheology     Full-text available via subscription   (Followers: 7)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 4)
Journal of Scientific Research     Open Access  
Journal of Sensors     Open Access   (Followers: 25)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Physics     Open Access   (Followers: 8)
Journal of Spectroscopy     Open Access   (Followers: 6)
Journal of Superconductivity and Novel Magnetism     Partially Free   (Followers: 1)
Journal of Synchrotron Radiation     Open Access   (Followers: 3)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 32)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free  
Journal of the Physical Society of Japan     Hybrid Journal   (Followers: 2)
Journal of Theoretical and Applied Physics     Open Access   (Followers: 9)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 11)
Journal of Vibration and Control     Hybrid Journal   (Followers: 42)
Journal of Visualization     Hybrid Journal   (Followers: 3)
Journal of Zhejiang University : Sceince A     Hybrid Journal  
JPSE (Journal of Physical Science and Engineering)     Open Access  
Jurnal Fisika     Open Access  
Jurnal Ilmiah Pendidikan Fisika Al-Biruni     Open Access  
Jurnal NEUTRINO     Open Access  
Jurnal Online of Physics     Open Access  
Jurnal Pendidikan Fisika Indonesia (Indonesian Journal of Physics Education)     Open Access  
Jurnal Penelitian Fisika dan Aplikasinya     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kasuari : Physics Education Journal     Open Access  
La Rivista del Nuovo Cimento     Hybrid Journal  
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Letters in High Energy Physics     Open Access  
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Light : Science & Applications     Open Access   (Followers: 3)
Living Reviews in Computational Astrophysics     Open Access   (Followers: 3)
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal   (Followers: 2)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 5)
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 2)
Magnetic Resonance     Open Access  
Magnetic Resonance Letters     Open Access  
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 31)
Matéria (Rio de Janeiro)     Open Access  
Materials and Design     Open Access   (Followers: 47)
Materials at High Temperatures     Full-text available via subscription   (Followers: 3)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Research Innovations     Hybrid Journal   (Followers: 1)
Materials Science     Hybrid Journal   (Followers: 7)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 44)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 22)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 15)
Materials Science and Technology     Hybrid Journal   (Followers: 40)
Materials Today Physics     Hybrid Journal   (Followers: 1)
Matériaux & Techniques     Full-text available via subscription   (Followers: 2)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 3)
Matter and Radiation at Extremes     Open Access   (Followers: 1)
Matters Select     Open Access  
Meccanica     Hybrid Journal   (Followers: 1)
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 6)
Mechanics of Materials     Hybrid Journal   (Followers: 25)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 2)
Mechanics Research Communications     Hybrid Journal   (Followers: 4)
Medical Physics     Hybrid Journal   (Followers: 17)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 11)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Instrumentation     Open Access   (Followers: 57)

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Jurnal Online of Physics
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2502-2016
Published by Universitas Jambi Homepage  [24 journals]
  • IDENTIFIKASI LIMBAH PALM OIL MILL EFFLUENT (POME) MENGGUNAKAN BIOSENSOR
           BERBASIS ALGA

    • Authors: Dina Maryani, Lazuardi Umar
      Pages: 1 - 6
      Abstract: Palm Oil Mill Effluent (POME) merupakan limbah minyak kelapa sawit yang memiliki kadar Chemical Oxygen Demand (COD) dan Biochemical Oxygen Demand (BOD) yang tinggi dan sehingga merusak ekosistem periairan serta menurunkan kadar oksigen terlarut (DO). Namun, POME memiliki nutrisi untuk sel alga dalam memproduksi oksigen. Berdasarkan hal tersebut diperlukan identifikasi POME yang jatuh kebadan air berdasarkan fotosintesis Chlorella sp. menggunakan biosensor. Biosensor telah banyak dikembangkan dalam aplikasi bidang lingkungan dengan melihat kadar oksigen terlarut sebagai kualitas perairan. Penelitian ini menggunakan biosensor dengan prinsip sensor amperometris  tipe Biochip-G. Sensor amperometris mengukur perubahan arus dari reaksi reduksi dan oksidasi dan menghasilkan potensial keluaran yang terukur. Potensial keluaran yang terukur merupakan kadar oksigen terlarut dari penambahan POME terhadap Chlorella sp. ketika proses fotosintesis terjadi. Identifikasi POME berdasarkan proses fotosintesis Chlorella sp. menggunakan cahaya artifisial LED Putih 380 nm-780 nm dengan tingkat variasi konsentrasi POME sebanyak 10%, 20%, dan 30%. Berdasarkan pengukuran kadar oksigen terlarut (DO) menghasilkan nilai DO sebesar 174.15%, 154.66%, dan 138.98% serta nilai sensitivitas sebesar 4mV/%POME.  
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14387
      Issue No: Vol. 7, No. 1 (2021)
       
  • PEMANFAATAN EKSTRAK UBI UNGU SEBAGAI INDIKATOR LABEL DALAM PEMANTAUAN
           KESEGARAN UDANG MENGUNAKAN NEURAL NETWORK

    • Authors: Siswoyo Siswoyo, Anisah Mega Andini, Dea Amelia, Aisyah Deri Ayu Tungga Safitri, Yuant Tiandho
      Pages: 7 - 12
      Abstract: The main weakness in shrimp marketing is the perishable food nature of shrimp. Generally, people identify the freshness of shrimp by direct observation. However, it will be difficult to detect the freshness of shrimp if it is marketed in a closed container. In this study, a label indicator of purple sweet potato will be made to detect the freshness of shrimp. The increase in the efficiency of indicator readings is carried out using a neural network algorithm. The results of the sensitivity test showed that the label indicator of purple sweet potato extract was sensitive to the presence of ammonia.Through a comparison between the storage time of shrimp and the organoleptic quality of shrimp, it is known that the quality of shrimp is divided into four classes, namely: (i) "Very fresh" marked with a solid red color (ii) "Fresh marked with a deep blue color (iii) "not fresh marked with a dark red color. gray and (iv) “very unrefreshing marked with a faded brown color. Through label indicator image classification using a neural network algorithm, from 73 training data obtained an accuracy rate of 95.89% and a precision of 92%.
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14500
      Issue No: Vol. 7, No. 1 (2021)
       
  • PEMODELAN GENERATOR YANG EFEKTIF YANG DIPASANGKAN DENGAN IMPACT WRENCH
           SEBAGAIUSAHA UNTUK MENINGKATKAN DAYA PADA PEMBANGKIT LISTRIK TENAGA SAMPAH
           

    • Authors: Hubertus Ngaderman, Ego Srivajawaty Sinaga
      Pages: 13 - 19
      Abstract: The amount of waste can be overcome, some efforts are needed to reduce it. This research will focus on the numerical model of a solid waste power plant. Researchers replace turbine with an impact which have a specification certain pressure, the impact rotates the generator The purpose of this research is to get the rms voltage of a generator, where the generator is a generator capable of supplying a  rms voltage. This effort is made to convert waste energy into electrical energy. Generators which are the main topic in this research are synchronous generators and permanent magnet generators. Water with a mass of  requires a temperature of to provide the required stress, while water with a mass of , its temperature is  Water with a mass of  requires a temperature of  to provide the required voltage, while water with a mass of  has a temperature of . For a water mass of , a temperature of , the synchronous rotor speed is , the rms voltage is . To reach the rms voltage of , the rotor on the generator must rotate at a synchronous speed of .        
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.13106
      Issue No: Vol. 7, No. 1 (2021)
       
  • PEMODELAN DINAMIKA TIPPE TOP (TT) DENGAN KENDALA NON-HOLONOMIK BERBASIS
           KOMPUTASI FISIKA PADA BIDANG DATAR (R^2×SO(3))

    • Authors: Melly Ariska, Hamdi Akhsan, Muhammad Muslim
      Pages: 20 - 25
      Abstract: Pemodelan sistem dinamik dalam real time sangat penting dalam kemajuan teknologi otomatis yang berkembang pesat saat ini, seperti metode perencanaan sistem robotic. Artikel ini menjelaskan sistem dinamik benda tegar dengan kendala non-holonomic pada ruang konfigurasi . Metode yang digunakan adalah Motion Planning Network dan simulasi numeric dengan komputasi fisika yang dapat digunakan untuk sistem benda non-holonomik yang bergerak secara real-time dengan Pendekatan Jellet Invarian (JI). Pendekatan JI dapat menghasilkan persamaan sistem gerak dan mengevaluasi simulasi model benda dengan kendala non holonomik dan juga menampilkan hasil eksperimen dinamika benda tegar dalam ruang konfigurasi . Sistem gerak benda dengan kendala non holonomik yang digunakan adalah Tippe top (TT). TT adalah mainan yang mirip seperti gasing yang jika diputar dapat membalik sendiri dengan batangnya. Penulis berhasil mendeskripsikan dinamika gerak TT secara real time dengan syarat awal bervariasi pada ruang konfigurasi .
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14457
      Issue No: Vol. 7, No. 1 (2021)
       
  • PENGARUH JARAK, KEMIRINGAN, DAN INTENSITAS CAHAYA PADA ANALISIS UKURAN
           PORI MASKER KAIN MENGGUNAKAN SMARTPHONE

    • Authors: Meri Hamdini, Diana Novita Sari, Susanti Susanti, Yuant Tiandho
      Pages: 26 - 30
      Abstract: One of the common strategies used to minimize the spread of Covid-19 is to wear a cloth mask. Cloth masks have a lower effectiveness value compared to other types of masks but have the potential to be used as an alternative, especially during a pandemic. Smartphone can be used as an initial idea for determining the quality of a cloth mask. In taking pore images, there are factors that have the potential to affect the results of pore size, namely distance, angle of inclination, and light intensity. Taking photos of masks with a magnification application is done with three variations, namely distance, angle, and light intensity. The distance for taking pore images is varied to 3, namely 8 cm; 10 cm; and 12 cm. The image capture angle is varied to 0p; 5o; and 10o. measurement using a distance of 10 cm has the closest value from the measurement results by taking images using a microscope, which is 0.232 mm. In the variation of the angle, the angle that is parallel or 0o to the plane of the cloth mask has a value that is close to the microscope measurement, which is 0.232 mm. The light intensity measured using a lux meter which shows the results of 240 has a value that is closest to taking an image using a microscope, which is 0.221 mm.
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14502
      Issue No: Vol. 7, No. 1 (2021)
       
  • ANOMALI SP BAWAH PERMUKAAN ZONA AIR ASIN DAN ZONA AIR TAWAR DI DESA MATA
           IE RANTO PEURELAK KABUPATEN ACEH TIMUR

    • Authors: Maulina Mawaddah, Fajriani Fajriani
      Pages: 31 - 35
      Abstract: Telah dilakukan penelitian sebaran bawah permukaan zona air asin dan zona air tawar di Desa Mata Ie Kecamatan Ranto Peurelak Kabupaten Aceh Timur menggunakan metode Self-Potential dengan teknik Fixed-Based. Data SP diolah menggunakan Surfer 13 untuk memperoleh peta kontur isopotensial. Sebaran zona air tawar berada disebagian wilayah utara dengan nilai SP tinggi berkisar antara 24 mV sampai 30 mV dan sebagian wilayah lainnya merupakan zona air asin dengan nilai SP rendah berkisar antara -2 mV sampai -4 mV. Nilai SP pada zona air asin cenderung rendah diperkirakan akibat dari jumlah akumulasi air tawar lebih besar dibandingkan dengan akumulasi air asin sehingga nilai Sp yang terukur tinggi. Hasil dari analisis uji DO dan pH membuktikan bahwa di daerah lokasi penelitian terdapat air asin dan air tawar.
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14719
      Issue No: Vol. 7, No. 1 (2021)
       
  • DESAIN BANGUN pH TANAH DIGITAL BERBASIS ARDUINO UNO

    • Authors: Vera Fuspita Sari Vera, Riska Ekawita, Elfi Yuliza
      Pages: 36 - 41
      Abstract: Indonesia merupakan negara agraris yang mayoritas dari penduduknya berprofesi sebagai petani. Faktor utama dalam bidang pertanian berkaitan dengan kualitas tanah. Kualitas dari tanaman dapat dipengaruhi oleh beberapa parameter salah satunya pH (tingkat asam dan basa). Pada beberapa kasus, pengukuran pH tanah dilakukan dengan memanfaatkan kertas lakmus. Di sisi lain, sistem sensor dan instrumentasi telah berkembang sehingga memungkinkan dilakukan penelitian mengenai digitalisasi pengukuran pH tanah. Berdasarkan hal tersebut, maka dilakukan desain bangun pH tanah digital berbasis mikrokontroller. Perancangan sistem elektronik menggunakan beberapa komponen yaitu LED, LCD, buzzer dan sensor pH. Komponen tersebut dihubungkan dengan mikrokontroller sesuai perintah yang diinginkan. Ketika input masukan dari sensor terbaca maka LED, buzzer, dan LCD memberikan respon berupa cahaya, bunyi dan tampilan nilai output. Untuk mengetahui tingkat akurasi dari alat yang dibuat, dilakukan kalibrasi sensor pH tanah dengan membandingkan nilai keluaran pH standar terhadap nilai tegangan ADC (Analog Digital to Converter) pada sensor. Selanjutnya, dilakukan pengambilan data dengan sampel yang berbeda. Apabila tanah bersifat asam, LED 1 dan buzzer akan  hidup serta berlaku sebaliknya. Hasil penelitian menunjukkan alat dapat mengukur pH pada range 3,5 -7 dengan error 2,40%,  untuk pH >8 error yang dihasilkan cukup besar sehingga alat ini cocok mengukur pH tanah dengan range <8.
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14589
      Issue No: Vol. 7, No. 1 (2021)
       
  • APLIKASI SENSOR KELEMBABAN DAN FLEX SENSOR BERBASIS ARDUINO UNO UNTUK
           SISTEM PENDETEKSI LONGSOR

    • Authors: Rustan Rustan, Jesi Pebralia, Tika Restianingsih, Frastica Deswardani, Nurhidayah Nurhidayah, Iful Amri
      Pages: 42 - 46
      Abstract: Early detection of landslides is very important to minimize the number of deaths. Technological developments allow humans to predict the signs of landslides more accurately, quickly, and scientifically. In this study, sensors were tested to measure landslide disaster parameters, namely humidity sensors to measure soil moisture and flex sensors to measure soil movement. The sensor is controlled using a microcontroller Arduino Uno. A functionality test was carried out to test the ability of the sensors. The functionality test was carried out using the unit testing method. The unit testing method is carried out by comparing the functional test results of each sensor to the expected response. The moisture sensor functionality test shows that the sensor is able to respond to changes in water content in the soil with changes in voltage. The linear equation resulting from the calibration of the humidity sensor is y = -0.126x + 2.666 with R2 = 0.871. The flex sensor functionality test shows that the sensor is able to detect soil movement in the presence of changes in voltage. The linear equation resulting from the flex sensor calibration is y = -2.861x + 2507 with R2 = 0.964. This shows that the humidity sensor and flex sensor are good enough to be applied in the design of a landslide detection system.  
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14805
      Issue No: Vol. 7, No. 1 (2021)
       
  • APLIKASI METODE GEOLISTRIK RESISTIVITAS UNTUK MENGIDENTIFIKASI LAPISAN
           BAWAH PERMUKAAN JALAN RASAU JAYA, KABUPATEN KUBU RAYA

    • Authors: Yupensius Febi Ariputra, Yoga Satria Putra, Muhardi Muhardi
      Pages: 47 - 51
      Abstract: Jalan Rasau Jaya Kabupaten Kubu Raya berpotensi mengalami kerusakan karena dibangun di atas lapisan yang diduga kurang kompak. Tujuan penelitian ini adalah untuk mengidentifikasi lapisan bawah permukaan di sekitar Jalan Rasau Jaya. Penelitian ini menggunakan metode geolistrik resistivitas dengan konfigurasi Wenner. Metode ini dapat mengidentifikasi sebaran nilai resistivitas bawah permukaan secara lateral. Nilai resitivitas yang diperoleh dijadikan acuan dalam mengidentifikasi lapisan bawah permukaan. Pengukuran dilakukan dengan mengaplikasikan 4 dengan panjang masing-masing 141 m, dan jarak antar elektroda sejauh 3 m. Hasil penelitian menunjukkan bahwa sebaran nilai resistivitas di lokasi penelitian sebesar 2 – 584 Ωm hingga kedalaman 23,6 m. Hasil interpretasi menunjukkan bahwa lapisan bawah permukaan terdiri dari 3 (tiga) lapisan. Lapisan pertama mempunyai nilai resistivitas 260 - 584 Ωm yang diinterpretasi sebagai pasir dan kerikil.  Lapisan kedua mempunyai nilai resistivitas 11,1 – 259 Ωm yang diinterpretasi sebagai lapisan lempung berpasir. Lapisan ketiga mempunyai nilai resistivitas 2,0 – 10,1 Ωm, yang diinterpretasi sebagai lapisan akuifer.
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.14632
      Issue No: Vol. 7, No. 1 (2021)
       
  • STUDY AWAL KARAKTERISASI SENSOR WARNA TC3200 UNTUK MENENTUKAN KADAR KAFEIN
           PADA KOPI

    • Authors: Heriyanti Heriyanti, Samsidar Samsidar, Iful Amri, Jesi Pebralia, Rustan Rustan, Linda Handayani, Desi Ayundari, Sutrisno Sutrisno
      Pages: 52 - 57
      Abstract: Pengukuran kadar kafein saat ini dibutuhkan agar penggunaan/konsumsi kopi sesui dengan dosis yang dibutuhkan, akan tetapi, sulitnya karakterisasi dan uji kimia dalam penentuan kadar kafein menjadi hambatan untuk mengetahui dosis kafein secara cepat dan tepat. Pada penelitian ini telah dilakukan karakterisasi sensor warna TC3200 sebagai studi awal rangkaian pembuatan alat ukur kafein berbasis sensor. Sampel yang digunakan adalah kopi Liberika, Arabika dan Robusta yang berasal dari Provinsi Jambi. Preparasi sampel dilakukan dengan proses roasting pada suhu 180OC dan pada saat proses berjalan pengambilan sampel secara real time pada (t= 38-45s), hasil preparasi sampel dilakukan uji UV-Vis untuk mengetahui konsentrasi kandungan kadar kafein. Selanjutnya karakterisasi sensor warna TC3200 dilakukan untuk mengetahui nilai RGB (Red, Green, Blue) dari masing – masing sampel kopi. Hasil penelitian didapatkan nilai kadar kafein dari pengukuran UV-Vis yang akan menjadi database sensor, dan hasil karakterisasi sensor warna TC3200 pada kopi Liberika, Arabika dan Robusta secara kuantitatif didapatkan tingkat kevalidan data masing – masing 80%, 60% dan 70% dan analisis kualitatif bahwa sensor dapat digunakan untuk menetukan kadar kafein pada kopi dengan tingkat kematangan atau waktu roasting kopi yang berbeda.
      PubDate: 2021-11-02
      DOI: 10.22437/jop.v7i1.15286
      Issue No: Vol. 7, No. 1 (2021)
       
 
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