Articles
<![CDATA[Partikel Dirac dalam Sumur Potensial Dinamis ]]>
<![CDATA[Tiandho, Yuant]]>
<![CDATA[ EduMatSains Vol 1, No 1 (2016): Juli 2016 ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Kristen Indonesia ]]>
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<![CDATA[Infinite square well potential is one of the most elementary quantum mechanical system. The calculation of this case is not too complicated, however, it can show the differences between quantum world and classical world with clearly. In this letter, we expand the discussion about the infinite square well potential for dynamic potential well by involving relativistic corrections. The dynamic potential is defined as potential wall that depend on time because the potential can moving with constant velocity. The Dirac equation is used to describe condition in the potential well. By this consideration, we hope the result will be useful in the development of nanoelectronic devices. To obtain solution of probability density of Dirac particles that depend on space and time, we transform the Dirac equation into hyperbolic coordinates and the differential equations can be solved by separation variables method.]]>
<![CDATA[MODIFIKASI DISTRIBUSI MASSA PADA SUATU OBJEK SIMETRI BOLA ]]>
<![CDATA[Tiandho, Yuant]]>
<![CDATA[ Jurnal Pendidikan Fisika Vol 4, No 2 (2016) ]]>
Publisher : <![CDATA[UNIVERSITAS MUHAMMADIYAH METRO ]]>
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<![CDATA[Umumnya, untuk menggambarkan distribusi massa sebagai fungsi ruang dilakukan pemisahan untuk kondisi di luar dan di dalam objek. Di dalam makalah ini, kami mengusulkan suatu distribusi massa yang berlaku pada kedua kondisi tersebut sehingga tidak perlu dilakukan pemisahan. Jika fungsi tersebut digunakan dalam proses komputasi atau simulasi diharapkan dapat memperingkas algoritma. Fungsi distribusi massa diturunkan berdasarkan fungsi distribusi Fermi-Dirac untuk faktor Boltzman yang bernilai sangat kecil. Adapun objek yang ditinjau adalah objek yang memenuhi sifat simetri bola tetapi tidak menutup kemungkinan dapat diperluas pada sebarang bentuk objek. Melalui fungsi distribusi massa tersebut dapat diturunkan gaya gravitasi, medan gravitasi, dan potensial gravitasi pada sebarang titik tinjau yang bernilai sama dengan tinjauan konvensional. Dengan analogi gaya gravitasi dan elektrostatis maka fungsi distribusi massa tersebut juga dapat diperluas untuk distribusi muatan listrik.]]>
<![CDATA[Miskonsepsi gaya gesek pada mahasiswa ]]>
<![CDATA[Tiandho, Yuant]]>
<![CDATA[ Jurnal Pendidikan Fisika dan Keilmuan (JPFK) Vol 4, No 1 (2018) ]]>
Publisher : <![CDATA[UNIVERISTAS PGRI MADIUN ]]>
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DOI: 10.25273/jpfk.v4i1.1814
<![CDATA[Pada makalah ini dilakukan evaluasi pemahaman mahasiswa tingkat awal terkait konsep gaya gesek yang telah mereka pelajari ketika di sekolah menengah atas. Berdasarkan pengujian awal dapat diketahui bahwa kebanyakan mahasiswa masih mengalami miskonsepsi terkait konsep gaya gesek, khususnya dalam konsep gaya gesek statis. Tingginya miskonsepsi mahasiswa terkait gaya gesek statis disebabkan oleh banyaknya literatur yang merumuskan gaya gesek statis secara tidak tepat yaitu sebagai perkalian dari koefisien gesek statis dengan gaya normalnya yang bernilai konstan. Selain itu, ungkapan matematis dari gaya gesek statis yang menggunakan simbol ketidaksamaan meningkatkan potensi miskonsepsi karena dirasa lebih sulit oleh mahasiswa seperti dinyatakan dalam penelitian Handhika, et al. (2015). Melalui pengajaran dengan rumusan gaya gesek statis yang benar menggunakan metode analogi, mahasiswa dapat memahami konsep gaya gesek dan implikasinya secara lebih baik dari sebelumnya. Sehingga dari penelitian ini diharapkan guru menggunakan buku teks yang memberikan deskripsi yang benar tentang gaya gesek.]]>
<![CDATA[KOREKSI GAYA GRAVITASI DAN EFEK GRAVITOELEKTROMAGNETISME BERDASARKAN ENTROPI GRAVITASI KUANTUM ]]>
<![CDATA[Tiandho, Yuant]]>
<![CDATA[ Jurnal Matematika Sains dan Teknologi Vol 18 No 2 (2017) ]]>
Publisher : <![CDATA[LPPM Universitas Terbuka ]]>
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<![CDATA[In the weak-field limit condition, the gravitational force has a form that is analogous to the electromagnetic force. So that by using the analogy, we may propose the formula that called as gravitoelectromagnetism effect. Like the electromagnetic field, the gravity also predicted to has gravitoelectric field and gravitomagnetic field. In this paper we derive the expression of gravitational force as the entropic force according to correction of the generalized uncertainty principle (GUP) in the study of quantum gravity. Newton's gravitational force arise naturally due to the change of information (entropy) of a holographic screen that produced by object with mass M and it can be detected by other object which has mass m. From the formulation of gravity that we obtain, it appears that in the surrounding of object with mass M can be found the additional mass density which is indicated as a quantum foam. So according to the indications we calculate the gravitoelectric field and the gravitomagnetic field of the rotating object and we found that the result also influenced by the quantum fluctuations.
Pada kondisi medan lemah gaya gravitasi memiliki bentuk yang analogi dengan gaya elektromagnetik, sehingga melalui analogi tersebut dapat diajukan suatu rumusan yang disebut dengan efek gravitoelektromagnetisme. Layaknya medan elektromagnetik, gravitasi juga diprediksi memiliki medan gravitoelektrik dan medan gravitomagnetik. Di dalam artikel ini penulis mencoba menurunkan ungkapan gaya gravitasi sebagai gaya entropik berdasarkan koreksi dari generalized uncertainty principle (GUP) sesuai kajian gravitasi kuantum. Gaya gravitasi Newton muncul secara alami karena adanya perubahan informasi (entropi) dari layar holografik yang dihasilkan oleh objek bermassa M dan terdeteksi oleh objek lain yang bermassa m. Dari rumusan gaya gravitasi yang diperoleh tampak bahwa di sekitar objek bermassa M terdapat densitas massa tambahan yang dapat dipandang sebagai quantum foam. Dengan adanya indikasi tersebut penulis menghitung medan gravitoelektrik dan gravitomagnetik pada objek yang berotasi dan ternyata kedua medan yang dihasilkan juga dipengaruhi oleh adanya fluktuasi kuantum.]]>
<![CDATA[Impact of Shading Net on Photovoltaic Cells Performance ]]>
<![CDATA[Sunanda, Wahri]]>;
<![CDATA[Gusa, Rika Favoria]]>;
<![CDATA[Tiandho, Yuant]]>;
<![CDATA[Pratama, Erick Aryana]]>
<![CDATA[ Jurnal Teknik Elektro Vol 11, No 2 (2019): Jurnal Teknik Elektro ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro, Fakultas Teknik, Universitas Negeri Semarang ]]>
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DOI: 10.15294/jte.v11i2.23699
<![CDATA[The output of the photovoltaic cells such as voltage and current is an essential parameter to assess the performance of photovoltaic cells. The performance of photovoltaic cells depends on the intensity of solar irradiation and the cleanliness conditions of cells. One of the factors that influence the performance of photovoltaic cells is shading. It can reduce the intensity of solar irradiation on the cells. In this study, the measurement system used two units of current and voltage sensors that simultaneously measures the performance of photovoltaic cells. In photovoltaic cells covered by a shading net with nominal shading rates of 50% and 90%, the average efficiency is 6% and 2% respectively. Meanwhile, for photovoltaic cells without covering by a shading net, the average efficiency is 11%.]]>
<![CDATA[Model Dye-Sensitized Solar Cell dan Aplikasinya Berdasarkan Data Temperatur Harian: Studi Kasus Pangkalpinang ]]>
<![CDATA[Noor, Aliefia]]>;
<![CDATA[Hamdini, Meri]]>;
<![CDATA[Ramadina, Salsabila]]>;
<![CDATA[Tiandho, Yuant]]>
<![CDATA[ Jurnal Pendidikan Fisika dan Keilmuan (JPFK) Vol 6, No 2 (2020) ]]>
Publisher : <![CDATA[UNIVERISTAS PGRI MADIUN ]]>
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DOI: 10.25273/jpfk.v6i2.7707
<![CDATA[Dye-Sensitized Solar Cells (DSSC) is photovoltaic with a dye that functions as an acceptor of sunlight. The great potential of using DSSC lies in the ease of the synthesis process, and the dyes used can come from plants. However, like most other solar cells, increasing the operating temperature can degrade the DSSC performance and thus decrease the efficiency. This article presents a model of the relationship between the effect of temperature on DSSC performance. The model proposed is derived from the DSSC equivalence with a diode circuit. By confirming the experimental research results, it is known that the model presented in this study has excellent accuracy on various DSSC performance parameters (R2> 0.99). The performance studied includes the I-V curve's shape, the value of the short-circuit current, the diode leakage current, and the open-circuit voltage. Based on daily temperature data in Pangkalpinang City, the potential performance of the DSSC could also be determined when it was developed in Kep. Bangka Belitung. The short-circuit current value obtained is in the range of 14 A with a voltage of 0.6 V. It is hoped that this proposed model can be information for the development of DSSC because of its enormous potential application in Indonesia.]]>
<![CDATA[MODIFIKASI DISTRIBUSI MUATAN BERDASARKAN DISTRIBUSI FERMI-DIRAC DAN APLIKASINYA PADA HUKUM GAUSS ]]>
<![CDATA[Tiandho, Yuant]]>;
<![CDATA[Maryana, Okky]]>;
<![CDATA[Afriani, Fitri]]>;
<![CDATA[Saefullah, Asep]]>;
<![CDATA[Pardede, Indra]]>
<![CDATA[ JST (Jurnal Sains dan Teknologi) Vol 9, No 2 (2020) ]]>
Publisher : <![CDATA[Universitas Pendidikan Ganesha ]]>
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DOI: 10.23887/jst-undiksha.v9i2.22851
<![CDATA[Hukum Gauss merupakan salah satu hukum fundamental fisika, khususnya dalam kajian listrik. Salah satu variabel penting untuk dapat menggunakan hukum Gauss adalah kemampuan menentukan muatan yang terlingkupi permukaan Gauss. Umumnya, definisi distribusi muatan suatu objek didefinisikan oleh fungsi sepenggal (piecewise continuous function). Pada makalah ini diajukan suatu model distribusi muatan yang berlaku untuk di seluruh lokasi. Model tersebut disusun berdasarkan analogi dengan fungsi distribusi Fermi-Dirac. Model yang diajukan mengandung fungsi eksponensial yang terkait dengan radius benda dan dilengkapi dengan suatu parameter untuk menghindari munculnya lekukan kurva yang bersifat tidak fisis. Distribusi muatan tersebut dapat digunakan untuk simulasi menghitung muatan yang terlingkupi oleh permukaan Gauss dan menentukan medan listriknya. Beberapa kasus yang ditinjau adalah objek bola padat serta bola konsentris. Jika dibandingkan dengan distribusi muatan konvensional, distribusi muatan termodifikasi lebih sederhana dan dapat mereduksi algoritma proses komputasi. Oleh karena itu hal ini dapat dimanfaatkan dalam pembuatan media pembelajaran berbasis komputer yang ringkas dan sederhana.]]>
<![CDATA[Kinerja Panel Surya Apung Pada Kulong Pasca Tambang Timah ]]>
<![CDATA[Gusa, Rika Favoria]]>;
<![CDATA[Puriza, M. Yonggi]]>;
<![CDATA[Tiandho, Yuant]]>;
<![CDATA[Sunanda, Wahri]]>
<![CDATA[ JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 3: November 2019 ]]>
Publisher : <![CDATA[Jurusan Teknik Elektro Universitas Andalas ]]>
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DOI: 10.25077/jnte.v8n3.704.2019
<![CDATA[Tin mining in the Bangka Belitung Islands Province, leaving a basin called the kulong. Kulong has an irregular landscape and contains very small amount of nutrients. Basically, kulong can be a storage place for water reserves to support the fisheries sector. But often, kulong water has poor dissolved oxygen concentration so that it is not suitable for fish growth. Therefore it needs an aeration system that can supply oxygen. The development of integrated aeration technology with floating solar panels in the kulong area is an interesting alternative solution to be developed. The floating solar panel system consists of a 50 Wp solar panel which is floated on a rectangular 4†PVC pipe and connected to a solar charge controller (MPPT), sealed lead-acid battery 12V 12 Ah and a 12V DC aerator as a source of aeration. An aluminum heatsink is installed at the bottom of the solar panel to transfer heat from solar panel to the kulong water so that temperature gets drop and the solar panel can produce higher voltage than solar panel placed on land. The voltage of the floating solar panel with the heatsink is higher on average 0.41V so that the average power generated by the floating solar panel is also about 2% higher than the power generated by solar panel on land.Key Words: Floating Solar Panel, Tin Kulong and AerationAbstrakPenambangan timah di Provinsi Kepulauan Bangka Belitung menyisakan cekungan yang disebut dengan kulong. Kulong memiliki lanskap yang tidak beraturan serta hanya mengandung unsur hara dalam jumlah yang sangat kecil. Pada dasarnya kulong dapat menjadi tempat penyimpanan cadangan air untuk mendukung sektor perikanan. Tetapi seringkali air kulong memiliki kadar konsentrasi oksigen terlarut yang buruk sehingga tidak baik bagi pertumbuhan ikan. Oleh karena itu dibutuhkan sistem aerasi yang dapat menyuplai oksigen. Pengembangan teknologi aerasi yang terintegrasi dengan panel surya apung di area kulong adalah solusi alternatif yang menarik untuk dikembangkan. Sistem panel surya apung terdiri dari panel surya 50 Wp yang diapungkan di atas pipa PVC 4†berbentuk persegi panjang dan dihubungkan dengan solar charge controller (MPPT), sealed lead-acid battery 12V 12 Ah dan aerator 12V DC sebagai sumber aerasi. Heatsink berbahan aluminium dipasang di bawah panel surya untuk mengalirkan panas dari panel surya ke air kulong sehingga suhu turun dan dapat menghasilkan tegangan lebih tinggi daripada panel yang diletakkan di darat. Tegangan panel surya apung dengan heatsink lebih tinggi rata-rata 0,41V sehingga rata-rata daya yang dibangkitkan oleh panel surya apung juga lebih tinggi sekitar 2% dibandingkan dengan daya yang dihasilkan oleh panel surya di darat.Kata Kunci : Panel Surya Apung, Kulong Timah dan Aerasi]]>
<![CDATA[COMPARISON OF EFFICIENCY AND CARBON EMISSIONS OF FILAMENT ELECTRIC STOVES AND INDUCTION ELECTRIC STOVES ]]>
<![CDATA[Tiandho, Yuant]]>;
<![CDATA[Afriani, Fitri]]>
<![CDATA[ Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 14, No 1 (2021): October ]]>
Publisher : <![CDATA[Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang ]]>
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DOI: 10.18860/neu.v14i1.13008
<![CDATA[Issues related to energy sustainability and carbon emission reduction are continuously being concerned by the Government of the Republic of Indonesia. Various efforts and programs have been launched to achieve targets of the related issues. As known that energy use for cooking by the household is continuously increasing in relation to population growth that will of course increase in energy need which relates to the sustainability of presence energy and carbon emission. Accordingly, the LPG stove conversion program to an electric stove was introduced in order to achieve the target to solve such issues. This paper compared of efficiency and carbon emissions of both electric filament stoves and induction stoves. The result indicated that the induction stove has better efficiency compared with the electric stove. The study also was proved that the carbon emissions for both types of stoves were relatively low in comparison with LPG stoves. However, the enormous operational power of the induction stove is still a challenge that must be resolved to achieve the target of energy sustainability in Indonesia.]]>
<![CDATA[SMARTPHONE-BASED ANALYSIS OF CLOTH MASKS PORES SIZE ]]>
<![CDATA[Hamdini, Meri]]>;
<![CDATA[Tiandho, Yuant]]>
<![CDATA[ Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 14, No 1 (2021): October ]]>
Publisher : <![CDATA[Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang ]]>
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DOI: 10.18860/neu.v14i1.13038
<![CDATA[Until now, the world is still facing the spread of the SARS-CoV-2 virus that causes COVID-19. This virus can be transmitted from human to human through droplets, so more vigilance is needed to avoid contracting this virus. One of the steps to minimize the spread of Covid-19 is to wear a face mask. In practice, most people prefer to use cloth masks than disposable medical masks because they are cheap and reusable. Cloth pore size influences the filtering ability of the cloth masks. Therefore, it is necessary to analyze the efficiencies of the cloth masks. In this study, we developed a method for measuring the pores of a cloth mask using a smartphone. In this study, we developed a method for measuring the pores of a cloth mask using a smartphone. We used the camera zoom application on a smartphone and analyzed the image using image processing software, ImageJ. We appliedHuang's algorithm to adjust the image binarization threshold then calculated the Feret diameter as the pore size of the mask. According to the analysis, the pore size ranged from 0.133 to 0.232 mm, and the efficiency ranged from 77.4 to 82.6%.]]>
