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<![CDATA[KOREKSI GAYA GRAVITASI DAN EFEK GRAVITOELEKTROMAGNETISME BERDASARKAN ENTROPI GRAVITASI KUANTUM ]]>
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Jurnal Matematika Sains dan Teknologi Vol. 18 No. 2 (2017) ]]>
Publisher : <![CDATA[LPPM Universitas Terbuka ]]>
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DOI: 10.33830/jmst.v18i2.133.2017
<![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[RANCANG BANGUN ALAT PENGERING OTOMATIS KERUPUK KEMPLANG DI DESA PENYAK ]]>
<![CDATA[Widodo Budi Kurniawan]]>;
<![CDATA[Fitri Afriani]]>;
<![CDATA[Herman Aldila]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Kumawula: Jurnal Pengabdian Kepada Masyarakat Vol 4, No 1 (2021): Kumawula: Jurnal Pengabdian Kepada Masyarakat ]]>
Publisher : <![CDATA[Universitas Padjadjaran ]]>
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DOI: 10.24198/kumawula.v4i1.30037
<![CDATA[Kegiatan pengabdian berupa Iptek bagi Masyarakat (IbM) merupakan salah satu penerapan Tri Dharma Perguruan Tinggi. Dengan adanya kegiatan pengabdian IbM, maka diharapkan akademisi dapat berinteraksi secara langsung dengan masyarakat. Lokasi yang menjadi sasaran kegiatan IbM adalah Desa Penyak Kecamatan Koba Kabupaten Bangka Tengah yang mayoritas mata pencaharian penduduknya adalah sebagai nelayan atau petani. Hasil tangkapan nelayan sebagian diolah menjadi kerupuk kemplang. Masalah yang muncul adalah bahwa proses pengeringan masih menggunakan cara tradisonal yaitu melalui penjemuran secara langsung di bawah terik matahari, sehingga proses pengeringan masih bergantung pada cuaca. Salah satu upaya untuk membantu masyarakat, khususnya kalangan kelompok usaha mikro di bawah naungan Badan Usaha Milik Desa (BUMDes) di Desa Penyak dalam mengatasi permasalahan pengeringan kerupuk kemplang adalah melalui sosialisasi pengeringan kerupuk kemplang menggunakan alat pengering otomatis. Kegiatan sosialisasi akan dilanjutkan dengan transfer teknologi tepat guna dan penyerahan alat pengering otomatis sehingga masyarakat dapat memanfaatkan teknologi tersebut secara langsung untuk meningkatkan kualitas produksi kerupuk kemplang. Hasil evaluasi menunjukkan bahwa kegiatan sosialisasi dan penyerahan alat pengering otomatis dimanfaatkan dengan baik dan bermanfaat bagi masyarakat.]]>
<![CDATA[Improvement of Hardness of Hydroxyapatite by the Addition of Silica from Tin Tailings ]]>
<![CDATA[Fitri Afriani]]>;
<![CDATA[Evi J]]>;
<![CDATA[Zaitun]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 2 No. 2 (2020) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v2i2.48
<![CDATA[The application of bone scaffolding in bone therapy is an alternative solution developed in bone tissue engineering technology to avoid bone donors' scarcity. The main requirement for a material that can be used as a scaffold is that it is biocompatible. Hydroxyapatite is a calcium phosphate ceramic that is often used as the primary material for scaffolding because it has good biocompatibility properties. However, like most ceramics, hydroxyapatite has low mechanical properties. In this study, we synthesized hydroxyapatite from cockleshell waste. To improve hydroxyapatite's mechanical properties (hardness), we added silica from tin tailings to hydroxyapatite. Through the analysis of the x-ray diffraction (XRD) pattern, it was found that hydroxyapatite was successfully synthesized from cockleshell using the co-precipitation method. Analysis of the diffraction pattern of tin tailings also shows that most of the crystals comprising tin tailings sand are silica in the ?-quartz phase. The addition of silica to hydroxyapatite followed by compaction and sintering at a temperature of 800 ? did not produce a new crystal phase. The addition still has a diffraction pattern consisting of a combined XRD pattern of hydroxyapatite and silica. Based on the hardness test using the Vickers hardness method, it is known that the addition of silica can increase the hardness of hydroxyapatite.]]>
<![CDATA[Sosialisasi dan Pendesaianan Sistem Elektrokoagulasi Bertenaga Surya dalam Pengolahan Limbah Batik Cual ]]>
<![CDATA[Sandi Sandi]]>;
<![CDATA[Andrian Saputra]]>;
<![CDATA[Deden Nurdandi]]>;
<![CDATA[Muhammad B Hariyono]]>;
<![CDATA[Redi Randika]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ ABDI: Jurnal Pengabdian dan Pemberdayaan Masyarakat Vol 3 No 1 (2021): Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat ]]>
Publisher : <![CDATA[Labor Jurusan Sosiologi, Fakultas Ilmu Sosial, Universitas Negeri Padang ]]>
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DOI: 10.24036/abdi.v3i1.64
<![CDATA[Perkembangan sektor pariwisata di Kep. Bangka Belitung diikuti oleh peningkatan permintaan produk budaya seperti batik cual. Meskipun dapat meningkatkan perekonomian, namun industri ini berpotensi menghasilkan limbah cair yang dapat mencemari lingkungan. Pada kegiatan pengabdian kepada masyarakat ini dilakukan sosialisasi dan pendesainan alat teknologi elektrokoagulasi bertenaga surya dalam pengolahan limbah batik cual. Agar dapat berjalan dengan baik maka kegiatan ini terdiri dari beberapa tahapan seperti koordinasi, pendesaian peralatan, evaluasi desain peralatan, finalisasi desain, kegiatan sosialisasi dan evaluasi kegiatan. Melalui koordinasi awal dengan mitra diperoleh informasi terkait produksi dan karakteristik limbah sebagai dasar pembuatan desain alat. Setelah dilakukan evaluasi diperoleh desain final alat untuk dipaparkan pada kegiatan sosialisasi. Kegiatan sosialisasi dihadiri oleh pemilik Kelompok Usaha Batik Melayu Pinang Sirih dan perwakilan dari Dinas Lingkungan Hidup Provinsi Kep. Bangka Belitung. Berdasarkan evaluasi yang dilakukan diketahui bahwa mitra dan perwakilan DLH Babel mengapresiasi desain yang diberikan.]]>
<![CDATA[MODIFIKASI DISTRIBUSI MASSA PADA SUATU OBJEK SIMETRI BOLA ]]>
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Jurnal Pendidikan Fisika Vol 4, No 2 (2016) ]]>
Publisher : <![CDATA[UNIVERSITAS MUHAMMADIYAH METRO ]]>
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DOI: 10.24127/jpf.v4i2.527
<![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[MESIN PANAS FOTO-CARNOT LUBANG HITAM NON-STASIONER ]]>
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Jurnal Sains Dasar Vol 6, No 1 (2017): April 2017 ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/jsd.v6i1.13065
<![CDATA[Di dalam makalah ini disajikan suatu analisis teoritik dari desain mesin panas foto-Carnot dengan sumber energi berupa lubang hitam non-stasioner. Diharapkan dari kajian ini dapat diketahui potensi penggunaan lubang hitam sebagai sumber “bahan bakar” dari suatu mesin panas. Desain mesin panas berbasis lubang hitam dikembangkan karena melalui mekanika kuantum lubang hitam dapat mengemisikan partikel dan memiliki temperatur layaknya dalam proses radiasi benda hitam. Perhitungan temperatur lubang hitam non-stasioner yang meradiasikan foton dilakukan berdasarkan gambaran tunneling dengan menggunakan metode Hamilton-Jacobi. Sebagai hasilnya, lubang hitam non-stasioner memiliki temperatur yang juga bergantung terhadap laju perubahan massa. Desain mesin panas yang dikaji dalam makalah ini terdiri dari dua buah lubang hitam non-stasioner berbeda massa sehingga memiliki perbedaan tekanan radiasi yang dapat menggerakkan piston. Secara umum, efisiensi dari mesin foto-Carnot bergantung pada massa lubang hitam, laju perubahan massa, serta suatu fungsi penyeimbang dalam metrik Vaidya.Kata kunci: mesin foto-Carnot, termodinamika lubang hitam, non-stasioner. Non-Stationary Black Hole Photo-Carnot Heat Engine Abstract This paper presents a theoretical analysis of a photo-Carnot heat engine design with an energy source from a non-stationary black hole. This study may provide a clue about the potential use of black hole as a “fuel” of a heat engine. Heat engine design was developed because according to quantum mechanics a black hole may emit particles and it has temperature like in the black-body radiation. The calculation of non-stationary black hole temperature which radiate photons is based on the tunneling picture by using the Hamilton-Jacobi method. As a result, the temperature of non-stationary black hole also depends on the mass flow rate. The model of heat engine that studied in this work contains two non-stationary black holes with different masses that have different radiation pressure to move the piston. In general, the efficiency of photo-Carnot engine depend on the mass of the black hole, the mass flow rate, and the balance function in the Vaidya metric. Keywords: photo-Carnot engine, black hole thermodynamics, non-stationary.]]>
<![CDATA[Dye-Sensitized Solar Cell-Based Photovoltaic Thermal for Ethanol Distillation: A Narrative Review ]]>
<![CDATA[Aliefia Noor]]>;
<![CDATA[Meri Hamdini]]>;
<![CDATA[Salsabila Ramadina]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Jurnal Geliga Sains: Jurnal Pendidikan Fisika Vol 8, No 2 (2020) ]]>
Publisher : <![CDATA[Program Studi Pendidikan Fisika FKIP Universitas Riau ]]>
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DOI: 10.31258/jgs.8.2.123-131
<![CDATA[The potential for solar energy in Indonesia is abundant and attractive to be developed into one of the leading renewable energy sources. Photovoltaic or solar cells are devices that can be used to convert solar energy directly into electrical energy. A dye-sensitized solar cell (DSSC) is an exciting type of solar cell to be developed because it is cheap, easy, and can use natural dyes based on plant extracts. However, the performance of DSSC degrades when it is at high operating temperatures. In this article, a narrative review is presented to improve the efficiency of DSSC by integrating with a solar collector in the form of a photovoltaic/thermal (PV/T) system. The solar collector will act as a heat absorbent from the DSSC, and the heat energy obtained will be used to distill ethanol. Optimization in the ethanol distillation system can take advantage of CuO as a nanoparticle in the working fluid or better know as nanofluid.]]>
<![CDATA[ANALYSIS OF INFLUENCE OF ACTIVATOR CONCENTRATION ON CHARACTERISTICS OF ACTIVATED CARBON FROM KETAPANG SHELL (Terminalia Catappa) BASED ON IMAGE PROCESSING METHOD ]]>
<![CDATA[Herman Aldila]]>;
<![CDATA[Megiyo Megiyo]]>;
<![CDATA[Fitri Afriani]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ Jurnal Geliga Sains: Jurnal Pendidikan Fisika Vol 6, No 1 (2018) ]]>
Publisher : <![CDATA[Program Studi Pendidikan Fisika FKIP Universitas Riau ]]>
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DOI: 10.31258/jgs.6.1.1-8
<![CDATA[Activated carbon from ketapang shell (Terminalia Catappa) has been successfully synthesized using dehydration-carbonization method. Activated carbon was conducted by immersing with sulphuric acid and followed by carbonization at 600oC for 2 hours. Pore characteristics were determined using imageprocessing methods of activated carbon micrographs based on parameters of area and caliper length. From the area approximation method obtained that the maximum pore size estimate was 5,69 μm at activator concentration 3% while the minimum was 4,88 μm at activator concentration 11% activator concentration respectively. At the other hands, caliper length approximation method obtained estimation of maximum pore size that was equal to 9,09 μm at activator concentration 3% and its minimum that was equal to 7,35 μm at activator concentration 7%. The porosity of the activated carbon from ketapang shell increased with the increase of sulfuric acid concentration and the highest value reached 24.96%.]]>
<![CDATA[PEMANFAATAN EKSTRAK UBI UNGU SEBAGAI INDIKATOR LABEL DALAM PEMANTAUAN KESEGARAN UDANG MENGUNAKAN NEURAL NETWORK ]]>
<![CDATA[Siswoyo Siswoyo]]>;
<![CDATA[Anisah Mega Andini]]>;
<![CDATA[Dea Amelia]]>;
<![CDATA[Aisyah Deri Ayu Tungga Safitri]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ JOURNAL ONLINE OF PHYSICS Vol. 7 No. 1 (2021): JOP (Journal Online of Physics) Vol 7 No 1 ]]>
Publisher : <![CDATA[Prodi Fisika FST UNJA ]]>
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DOI: 10.22437/jop.v7i1.14500
<![CDATA[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%.]]>
<![CDATA[PENGARUH JARAK, KEMIRINGAN, DAN INTENSITAS CAHAYA PADA ANALISIS UKURAN PORI MASKER KAIN MENGGUNAKAN SMARTPHONE ]]>
<![CDATA[Meri Hamdini]]>;
<![CDATA[Diana Novita Sari]]>;
<![CDATA[Susanti Susanti]]>;
<![CDATA[Yuant Tiandho]]>
<![CDATA[ JOURNAL ONLINE OF PHYSICS Vol. 7 No. 1 (2021): JOP (Journal Online of Physics) Vol 7 No 1 ]]>
Publisher : <![CDATA[Prodi Fisika FST UNJA ]]>
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DOI: 10.22437/jop.v7i1.14502
<![CDATA[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.]]>
