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All Journal Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Ilmu Dasar Jurnal Penelitian Fisika dan Aplikasinya (JPFA) BERKALA SAINSTEK Natural B Jurnal Fisika Unand GEA, Jurnal Pendidikan Geografi UNEJ e-Proceeding R.E.M (Rekyasa Energi Manufaktur) Jurnal Jurnal Fisika FLUX Sistemasi: Jurnal Sistem Informasi Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Spektra: Jurnal Fisika dan Aplikasinya STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Jurnal Teori dan Aplikasi Fisika Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Pillar of Physics: Jurnal Berkala Ilmiah Fisika InSTEM Geosfera Indonesia The International Journal of Remote Sensing and Earth Sciences (IJReSES)
Cahyono, Bowo Eko
Jurusan Fisika Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Jember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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PENGARUH PENAMBAHAN LEMAK MARGARIN TERHADAP KONSTANTA DIELEKTRIK MINYAK GORENG Bowo Eko Cahyono; M Misto; R Rofiatun
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 7 No. 1 (2017)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v7n1.p54-60

Abstract

Minyak goreng adalah minyak nabati yang telah dimurnikan dan dapat digunakan sebagai bahan pangan. lemak dan minyak memiliki sifat listrik yang khas dan besarnya sangat ditentukan oleh kondisi internal bahan tersebut. Penelitian untuk menguji kualitas minyak goreng dilakukan secara kimia, sementara pengujian berdasarkan kandungan lemaknya dengan sifat kelistrikan belum dilakukan. Penelitian ini dilakukan untuk mengetahui pengaruh penambahan lemak margarin terhadap konstanta dielektrik minyak goreng. Penelitian ini menggunakan metode kapasitif dengan bahan minyak goreng kelapa sawit kemasan, minyak goreng curah dan margarin. Dihasilkan bahwa nilai konstanta dielektrik minyak goreng kemasan mendekati nilai konstanta dielektrik minyak goreng curah pada penambahan margarin sebanyak 10 g - 11 g atau 18 % - 20 %. Hubungan antara penambahan margarin terhadap konstanta dielektrik minyak goreng adalah sangat kuat yang ditunjukkan dengan nilai koefisien korelasi sebesar 0,986 dan trend hubungan keduanya adalah linier yang didekati dengan persamaan garis y = 0,6334 x + 4,3197 dengan koefisien determinasi r2 sebesar 0,991.
The Rate of Land Cover Change using Landsat Data in Coal Mining Area of Sawah Lunto City, Indonesia Bowo Eko Cahyono; Yazella Feni Frahma; Agung Tjahjo Nugroho
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 9 No. 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p189-203

Abstract

Sawahlunto city is well-known for coal mining region. As in 2010, there have been at least 12 mining companies exploring coal resources in the region. As time passes, land cover conditions have gradually decreased due to mining activities. This region on which was originally covered by various vegetation and ecosystem have systematically transformed into open areas for coal mining. The use of remote sensing technology for land cover monitoring has been commonly well-developed in accordance with the need for improvement of detailed information about the changes of land use coverage. This study examines the land cover changes using supervised classification method based on Landsat data. The method focuses on four dominant classes of land cover in the region, namely forest, mining, settlement, and water resources. The classification processes were performed based on true-color composite satellite images. The results show that the overall accuracies of classification are 91.68 %, 92.49 %, 93.69 %, and 93.74 % in 2000, 2006, 2011, and 2016 respectively. It was also found that forest is the largest area in the coal mining area which, in some sense, tends to continuously decrease in terms of land cover in the last 15 years. The rate of forest area degradation achieved its maximum between 2006 and 2011.
The Accuracy Comparison of Oscilloscope and Voltmeter Utilizated in Getting Dielectric Constant Values Bowo Eko Cahyono; Misto Misto; Rofiatun Rofiatun
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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

Abstract

Parallel plate capacitor is widely used as a sensor for many purposes. Researches which have used parallel plate capacitor were investigation of dielectric properties of soil in various temperature [1], characterization if cement’s dielectric [2], and measuring the dielectric constant of material in various thickness [3]. In the investigation the changing of dielectric constant, indirect method can be applied to get the dielectric constant number by measuring the voltage of input and output of the utilized circuit [4]. Oscilloscope is able to measure the voltage value although the common tool for that measurement is voltmeter. This research aims to investigate the accuracy of voltage measurement by using oscilloscope and voltmeter which leads to the accuracy of values of dielectric constant. The experiment is carried out by an electric circuit consisting of ceramic capacitor and sensor of parallel plate capacitor, function generator as a current source, oscilloscope, and voltmeters. Sensor of parallel plate capacitor is filled up with cooking oil in various concentrations, and the output voltage of the circuit is measured by using oscilloscope and also voltmeter as well. The resulted voltage values are then applied to the equation to get dielectric constant values. Finally the plot is made for dielectric constant values along the changing of cooking oil concentration. The results show that the plot of dielectric constant values which are gained from the voltage measurement using voltmeter have better linearity compare to the other plot in which the voltage measurement utilize the oscilloscope. In conclusion, voltmeter is considered better equipment to measure a voltage compare to the oscilloscope in term of getting dielectric constant values of parallel plate capacitance sensor.
Karakterisasi Sensor Kapasitif Untuk Penentuan Level Aquades Bowo Eko Cahyono
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 1 No 2 (2016): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v1i2.583

Abstract

Kapasitor pelat sejajar adalah suatu komponen elektronika yang terdiri dari dua buah pelat penghantar sejajar yang disekat satu sama lain dengan suatu bahan dielektrik. Tujuan dari penelitian ini adalah mencari hubungan perubahan nilai kapasitansi terhadap kenaikan volume aquades dengan menggunkan metode kapasitif. Metode kapasitif memanfaatkan rangkaian sensor kapasitif yang dihubungkan dengan osiloskop untuk mengetahui tegangan masukan dan tegangan keluaran dan selanjutnya digunakan untuk menentukan nilai kapasitansi. Bahan yang digunakan dalam penelitian adalah aquades, dengan volume aquades yang digunakan divariasikan dari 18 mL sampai 180 mL. Hasil penelitian menunjukkan bahwa semakin meningkat volume aquades maka semakin besar nilai kapasitansi. Tetapi data hasil eksperimen menunjukkan bahwa ada beberapa hasil yang tidak konsisten yaitu meskipun volume aquades dinaikkan tidak menyebabkan kenaikan nilai kapasitansi. Hal ini terjadi pada kenaikan volume dari 72 mL ke 90 mL, kenaikan volume 108 mL ke 126 mL dan juga kenaikan volume aquades dari 144 mL ke 162 mL. Hubungan linieritas antara nilai kapasitansi dan level aquades dinyatakan dengan persamaan linier y = 0,0913x dengan koefisien linieritas R2 = 0,9106.
Analisa Kualitas Semen Melalui Pengukuran Konstanta Dielektrik Dan Resistivitas Bowo Eko Cahyono; Misto Misto; Holili Nur Arivah
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 2 No 2 (2017): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v2i2.1199

Abstract

Cement is an adhesive material that is capable of tying dense ingredients into one solid unity, cement was used as construction materials. Any materials including cement has physical properties and is largely determined by the magnitude of the internal condition of the materials. This research was conducted to find out the quality of cement by using measurements of the dielectric constant and resistivity values. The materials examined in the form of 3 brands of cement mixed with sand and water. This research method using capacitive and resistive by using an oscilloscope as a voltage reader. Note that the three cement brands have the same dielectric constant value i.e. amounting to 0.30 and resistivity value of 30.00 Ωm on day 28. The relationship between the dielectric constant value against the addition of age showed a decrease, while for values of resistivity shows an improvement. Onthe measurement of the dielectric constant shows that cement A brand more quickly achieve drying compared to brand B and brand C, as for the measurements of the resistivity shows that cement brand C more quickl yachieve drying compared to cement brand A and brand B.
Karakteristik Time Series Reflektansi Tanaman Padi Varietas Ciherang Dengan Analisis RGB Citra Fotografi Bowo Eko Cahyono; Agung Tjahjo Nugroho; Jamal Husen
Jurnal Fisika FLUX Vol 15, No 1 (2018): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (830.651 KB) | DOI: 10.20527/flux.v15i1.4381

Abstract

Padi merupakan tanaman pangan yang memiliki peran dan manfaat penting bagi masyarakat khususnya di Indonesia.Tanaman padi banyak ditemukan di lingkungan sekitar khususnya yang bertempat tinggal di daerah pedesaan. Tanaman padi memiliki banyak varietas yang mudah menyesuaikan terhadap lingkungan dan cara tanam. Seiring kemajuan ilmu pengetahuan dan teknologi kondisi tanaman pertanian seperti padi dapat dipantau secara cepat dari udara. Metode yang digunakan berupa pengamatan melalui helikopter ataudrone atau pesawat tanpa awak. Penelitian ini bertujuan untuk mengetahui karakteriktime seriesusia tanaman padi varietas Ciherang berdasarkan ekstraksi nilai reflektansi spektrum RGB ternormalisasi. Penelitian yang dilakukan berupa pengambilan data gambar tanaman padi dan kertas putih yang diletakkan di atas daun padi. Gambar diambil dari awal usia tanam (HST=hari setelah tanam) sampai panen. Gambar tersebut dicropping untuk memisahkan gambar tanaman padi dan kertas putih. Selanjutnya gambar diekstraks menggunakan software MATLAB R2014a berdasarkan spektrum warna red, green, dan blue (RGB). Hasil ekstraksi tersebut berupa nilai reflektansi RGB dan dinormalisasikan. Selanjutnya dibuat plot nilai reflektansi RGB ternormalisasi terhadap usia tanam. Hasil yang diperoleh dari penelitian ini adalah karakteristik time series reflektansi tanaman padi varietas Ciherang berdasarkan usia tanamnya. Berdasarkan hasil seluruh model grafik yang diperoleh dari ploting 3D dan 2D dapat dinyatakan bahwa nilai reflektansi spektrum R dan B terus meningkat seiring bertambahnya HST. Sedangkan nilai reflektansi spektrum G terus meningkat sampai sekitar HST 50 dan untuk HST berikutnya nilai reflektansi spektrum G menurun dikarenakan tanaman padi memasuki fase generatif sehingga daun tanaman padi tersebut mulai menguning dan cahaya green yang direfleksikan oleh tanaman padi juga mulai menurun.
Karakterisasi Konstanta Dielektrik dan Kapasitansi pada Lemak Hewani dengan Menggunakan Variasi Suhu dan Frekuensi Noer Rimafatin; Bowo Eko Cahyono; Misto Misto
Jurnal Fisika FLUX Vol 16, No 2 (2019): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (810.551 KB) | DOI: 10.20527/flux.v16i2.5486

Abstract

Fat is a food substance that is very important to maintain the health of the human body. One source of fat is animal fat. Differences in the type of fat can be known based on the electrical properties of materials such as dielectric constant and capacitance. The purpose of this research is to know the characteristic of dielectric constant and capacitance in animal fat by giving treatment of temperature and frequency variation. This research uses parallel plate capacitor method which is connected to the source of alternating current input voltage and voltmeter as the output voltage meter. The samples studied were chicken fat and beef fat. This research uses input voltage with frequency of 1kHz up to 20kHz, while temperature that is used is varied from 45⁰C decrease to 30⁰C. The results obtained from this study show that the increasing frequency results to the decreasing values of capacitance and dielectric constant in chicken fat and cow fat. The effect of temperature on the capacitance and dielectric constant of chicken fat and cow fat shows non linear relationship
Deteksi sebaran gas metana (CH4) di TPA Pakusari Jember menggunakan sensor TGS 2611 (Detection of methane gas (CH4) distributionin at TPA Pakusari Jember using TGS 2611 sensor) Sri Indariyatul Masruroh; Bowo Eko Cahyono; Agung Tjahjo Nugroho
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1035.475 KB) | DOI: 10.24036/6317171074

Abstract

Waste is an important issue in urban environments and will continue to be faced by governments and communities. Most waste disposal sites are concentrated in the Final Disposal Site (TPA). Waste accumulation in the landfill can create methane gas which can spread to the environment. The purpose of this research is to know the application of TGS 2611 sensor as methane gas detector and use it to measure methane gas distribution at TPA Pakusari Jember. This research is conducted by detecting the distribution of methane gas in TPA Pakusari. Data retrieval is performed by placing the sensor directly above the garbage pile and then observe the voltage value that appears on the LCD screen. The obtained data of voltage values are normalized and then they are visualized into 2 dimension contoure graph by using Matlab application. The results show that methane gas in TPA Pakusari is not spread evenly but it spreads randomly. This is due to the unequal garbage composition and the height random garbage at each measurement point. The largest methane gas is located in the area of the pile of organic waste that suffers from decay and the lowest methane gas is located in areas with little piles of rubbish and dominant with the soil. Thus it can be concluded that TGS 2611 sensor can be applied to detect the spread of methane gas in TPA Pakusari Jember.
GREENESS ANALYSIS OF FOREST IN MINING AREA OF SAWAHLUNTO USING NDVI METHOD BASED ON LANDSAT IMAGERIES IN 2006-2016 Bowo Eko Cahyono; Yazella Feni Frahma; Agung Tjahjo Nugroho
Spektra: Jurnal Fisika dan Aplikasinya Vol 3 No 1 (2018): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 3 Issue 1, April 2018
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.031.06

Abstract

Abstrak Pembukaan lahan hutan yang dijadikan lokasi pertambangan merupakan salah satu kegiatan yang dapat merubah jenis tutupan lahan atau sering disebut dengan konversi lahan. Salah satu daerah yang telah mengalami konversi lahan tersebut adalah Sawahlunto. Konversi lahan yang tidak menggunakan prinsip kelestarian lingkungan dapat mengakibatkan banyak hal negatif misalnya degradasi atau penurunan kualitas hutan. Tujuan dari penelitian ini adalah melakukan analisis tingkat degradasi hutan daerah pertambangan Sawahlunto tahun 2006 sampai 2016. Penelitian ini menggunakan teknologi penginderaan jauh berbasis citra satelit landsat. Citra satelit landsat ini diklasifikasikan dengan metode Normalized Difference Vegetation Index (NDVI) berdasarkan kerapatan vegetasi. Kemudian hasil klasifikasi ini dibuat dalam bentuk pemetaan. Klasifikasi pertama dikategorikan menjadi dua yakni hutan dan non hutan. Hasil yang didapatkan dari penelitian ini menunjukkan bahwa terjadi perubahan tutupan lahan yang semula hutan menjadi non hutan meningkat sebesar 7,5% selama kurun waktu sepuluh tahun. Klasifikasi selanjutnya yakni berdasarkan enam kategori yakni vegetasi sangat rapat, rapat, cukup rapat, non vegetasi 1, 2 dan 3. Dari klasifikasi ini, juga terlihat perubahan nilai NDVI maksimum maupun minimumnya. Tahun 2006 memiliki kisaran nilai NDVI maksimum 0,71 dan tahun 2016 memiliki kisaran nilai NDVI maksimum 0,56. Hal ini mengidentifikasi bahwa tingkat kehijauan yang ada di daerah pertambangan Sawahlunto menurun. Kata Kunci : degradasi, hutan, landsat, ndvi, klasifikasi, Sawahlunto. Abstract The clearing of forest land that is used as a mining site is one of the activities that can change the type of land cover or often called land conversion. One of the forest areas that convert the land is Sawahlunto. Conversion of land that does not use the principles of environmental sustainability can lead to many negative things one of which is the degradation. The purpose of this research is to analyze the level of forest degradation of Sawahlunto mining area in 2006 until 2016. This research uses a remote sen sing technology based on landsat satellite imagery. This landsat satellite image is classified by Normalized Difference Vegetation Index (NDVI) method based on vegetation density. Then the results of this classification is made in the form of mapping. The first classification is categorized into two namely forest and non forest. The results obtained from this study indicate that a change in land cover from forest to non-forest increased by 7.5% over a period of ten years. The next classification is based on six categories namely very dense vegetation, dense vegetation, fairly dense, non vegetation 1, 2 and 3. From this classification, also seen the change in NDVI maximum and minimum value. The year 2006 has a maximum NDVI value range of 0.71 and 2016 has a maximum NDVI value range of 0.56. This identifies that the existing greenness in the mining area of Sawahlunto is decreasing. Keyword : degradation, forest, landsat, ndvi, classification, Sawahlunto.
ANALYSIS THE EFFECT OF PRIMARY COIL LENGTH OF TRANSFORMATOR TO THE RESULTED ELECTROMOTIF FORCE Bowo Eko Cahyono; Muhammad Syukron Ali; Supriyadi Supriyadi
Spektra: Jurnal Fisika dan Aplikasinya Vol 4 No 1 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 1, April 2019
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (274.598 KB) | DOI: 10.21009/SPEKTRA.041.04

Abstract

Transformator is an electrical device that uses a principle of solenoid wrapped in kern, and there are usually two or more coils. Each coil of the taranformator is electromagnetically connected. The transformator is made to fulfill the specific level of voltage required in the devices or systems that use alternating current electrical energy. For example, transformator tap change is design to have different number of primary turns to produce a fixed output voltage, in term there is a changing in the input voltage. This research tries to analyze the effect of the length of primary coil difference of transformator to the voltage resulted in the secondary coil. The objective of the study is producing a relationship of primary coil length variation to the resulting voltage. Variation of coil length is made from 1 cm to 15 cm with interval of 1 cm coil length. The length of the secondary coil is also varied imto 3 cm, 6 cm, and 9 cm. The test is performed by providing the same input voltage at each variation of the primary coil length and then measure the output voltage. The results show that the longer primary coil will produce the smaller output voltage in the secondary coil of tranformator. Based on the resulted graph, the relationship of the length variant of primary coil is linear to the voltage measured in the secondary coil.with determination coefficient (R2) of 0.9603, 0.9775, and 0.9822 respectively forlength of 3 cm, 6 cm, and 9 cm of the secondary coil.
Co-Authors Agung Tjahjo Nugroho Agus Subekti Agus Subekti Agus Suprianto Agus Tjahjo Nugroho Ahmad, Mutiara Garnet Artoto Arkundato Aryono Adhi, Aryono Asih Sumarlin Chatarina Umbul Wahyuni Darmawan, Sukma Adi Ervin Budi Febriawan Fauziah, Helmi Frahma, Yazella Feni Hakim, Farid Lukman Helmi Fauziah Holili Nur Arivah Husen, Jamal Icha Wulan Maulinida Ina Dwi Utami Indarto Indarto Irvan Siswanto Jamal Husen Katsunoshin Nishi Linggar Ayu Octaviani Lutfi Rohman Mandala, Marga Misto Misto Misto Misto Misto Misto Misto, M Misto, M. Muhammad Ainur Rofiq Muhammad Syukron Ali Mukarromah, Luluk Mutiara Garnet R.A Mutmainnah Mutmainnah Niken Dwi Wulandari Noer Rimafatin Novia Puji Lestari Nur Shabrina Oktaviany Nurfaizatul Jannah Nursulistyono, Yuda Nurul Priyantari Nurwijayanti Octaviani, Linggar Ayu Permatasari, Yossika Dwi Putri Tunjung Sari Putri, Ervina Ikke Septiyas R Rofiatun Rizky Mauli Diyah Rofiatun Rofiatun Rofiatun, R Rozikan, Rozikan Sa’adah, Nurul Shofitri Zuhannisa' Siswanto Siswanto Siswanto Sri Indariyatul Masruroh Sudarmadi Sudarmadi Supriyadi Supriyadi Supriyadi Sutisna Sutisna Tri Mulyono Triatmojo, Muhammad Ikbal Nur Dian Umniyah, Inas Alfiyatul Wafi, Moh. Abduh Widiasih, Widiasih Winda Arif Febrayanti Yazella Feni Frahma Yazella Feni Frahma Yustisi Wulandari