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All Journal Jurnal Geliga Sains: Jurnal Pendidikan Fisika Jurnal Sains Dasar Jurnal Sains dan Teknologi Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Teknik Elektro Sinergi Jurnal Pendidikan Fisika FKIP UM Metro Journal of Mathematical and Fundamental Sciences JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Indonesian Journal of Science and Technology Jurnal Geosaintek JOURNAL ONLINE OF PHYSICS Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika JURNAL NASIONAL TEKNIK ELEKTRO Jurnal Fisika FLUX Edumatsains KLIK (Kumpulan jurnaL Ilmu Komputer) (e-Journal) Journal of Physics: Theories and Applications Jurnal Matematika Sains dan Teknologi Jurnal Pendidikan Fisika dan Keilmuan (JPFK) Sains Natural: Journal of Biology and Chemistry KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA Kumawula: Jurnal Pengabdian Kepada Masyarakat Journal of Engineering and Scientific Research (JESR) Journal of Appropriate Technology for Community Services Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Indonesian Review of Physics (IRiP) Stannum : Jurnal Sains dan Terapan Kimia Bioscientist : Jurnal Ilmiah Biologi Journal of Innovation and Technology Abimanyu: Journal of Community Engagement Jurnal Riset Fisika Indonesia Dharma Pengabdian Perguruan Tinggi (DEPATI) Science Technology and Management Journal (STMJ) Jurnal Geosaintek

Yuant Tiandho

Universitas Bangka Belitung

Author-ID : 583178

Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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SINTESIS PERANCAH HIDROKSIAPATIT BERPORI DARI LIMBAH CANGKANG KERANG MENGGUNAKAN METODE REPLIKASI SPONS POLYURETHANE Fitri Afriani; Anisa Indriawati; Widodo Budi Kurniawan; Yekti Widyaningrum; Rifqi Almusawi Rafsanjani; Yuant Tiandho
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 6, No 1 (2020)
Publisher : Universitas Sultan Ageng Tirtayasa

Researchers have synthesized hydroxyapatite-based porous scaffolds by the polyurethane sponge replication methods. Hydroxyapatite was derived from waste cockle shells through the co-precipitation method. The synthesis of porous scaffolds through the sponge replication methods is carried out by absorbing hydroxyapatite slurry through the addition of PVA and then followed by heating at 900oC to decompose the polyurethane and PVA. The best of slurry that can produce a porous scaffold in this study is the slurry that prepared through the ratio of hydroxyapatite:PVA = 80:20. The decomposition of the two polymers will leave macropores on the scaffold with an average size of 460 μm. Based on the thermogravimetric analysis, X-ray diffraction and FTIR spectrophotometer revealed that the PVA and polyurethane sponge were correctly decomposed, except for scaffolds with 40% PVA. Thus, the porous scaffolds synthesized in this study satisfies the requirements of porous scaffolds for the bone therapy process.

Kinerja Panel Surya Apung Pada Kulong Pasca Tambang Timah Rika Favoria Gusa; M. Yonggi Puriza; Yuant Tiandho; Wahri Sunanda
JURNAL NASIONAL TEKNIK ELEKTRO Vol 8, No 3: November 2019
Publisher : Jurusan Teknik Elektro Universitas Andalas

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

Model Konduktivitas Termal Nanofluida Berdasarkan Grup Tak-Berdimensi dengan Parameter Termofisika Kompleks Yuant Tiandho; Fitri Afriani
Jurnal Fisika FLUX Vol 17, No 1 (2020): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

This article presents a model of thermal conductivity of nanofluids based on dimensionless-group methods. In addition to the thermal conductivity of base fluids and nanoparticles, nanoparticle diameter, temperature, and volume fraction of nanoparticles, the proposed model involves several thermophysical parameters such as specific heat, density, and viscosity. The reason for the development of the model requires complex thermophysical parameters because, based on the experiments, these parameters determine the thermal conductivity of nanofluids. Validation of the model through comparison of the model with the experimental results shows that the models that have non-linear correlation have good accuracy in predicting the thermal conductivity of nanofluids.

Partikel Dirac dalam Sumur Potensial Dinamis Yuant Tiandho
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 1 No 1 (2016): Juli
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v1i1.66

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.

Pengaruh Lama Pemanasan Terhadap Karakteristik Kristal Kalsium dari Limbah Cangkang Kerang Fitri Afriani; Mustari Mustari; Yuant Tiandho
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 2 No 2 (2018): Januari
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v2i2.606

The high number of tin mining in the Bangka Belitung Islands leaves a number of problems such as unused land after tin mining. Whereas on the other side, the post tin mining areas can be used as a source of water reserves although additional treatment is needed because it is feared contain heavy metals. Calcium oxide is a compound that can be used to coagulate dispersed pollutants in water so that it can be used to improve the quality of water stored in the post tin mining area. One of the most abundant sources of calcium in the Bangka Belitung Islands comes from wasted cockle shell. Through a heating process at temperatures of about 700Â°C calcium carbonate in the wasted cockle shell will begin to decompose into calcium oxide. Based on the results obtained have known that the longer the heating process then the decomposition process of calcium carbonate more and more occur. Keywords: Rietveld, calcium crystal, heat treatment.

Green-Synthesis Nanopartikel SnO2 Termediasi Ekstrak Daun Pelawan (Tristaniopsis merguensis Griff.) Mustari Mustari; Evi J; Aliefia Noor; Rifqi Almusawi Rafsanjani; Yuant Tiandho
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 4 No 1 (2019): Juli
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v4i1.1043

SnO2 nanoparticles are materials that have great potential in gas sensor devices. In this article, the synthesis of SnO2 nanoparticles is carried out through the mediation of pelawan (Tristaniopsis merguensis Griff.) leaf extract. The use of mediators of natural materials in this synthesis aims to make the synthesis process more environmentally friendly and lower in cost compared to conventional chemical and physical methods. Pelawan extract contains high antioxidant compounds. Thus, it can inhibit the agglomeration of SnO2 particles. Based on the variation of pH synthesis, it is known that the highest purity of SnO2 phase occurs at pH 7 while for alkaline conditions, there is an impurity, i.e., Sn6O4(OH)4. Calcination temperature has a very significant effect on the growth of SnO2 nanoparticle crystals. High temperatures will increase the size of the crystallite and the crystallinity. Keywords: green-synthesis, pelawan, tin oxide

ANALISIS KUANTITATIF PORI BERDASARKAN PENGOLAHAN CITRA MENGGUNAKAN WOLFRAM MATHEMATICA Yuant Tiandho
KLIK- KUMPULAN JURNAL ILMU KOMPUTER Vol 4, No 1 (2017)
Publisher : Lambung Mangkurat University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/klik.v4i1.65

Currently, a porous material has been extensively developed in many areas of applied science and engineering. The characteristics of porous material is most often determined by its porosity. In this paper, we present a quantitative analysis of pores in a material according to image processing methods. An micrograph from electron microscopy (SEM) was analyzed by using Wolfram Mathematica. From our study can be obtained some informations about pore percentage (porosity), pore size, ratio aspect, and distribution of pore size in the materials.Keywords: pore, image processing, Wolfram MathematicaSaat ini, material berpori telah dikembangkan secara luas di banyak bidang sains terapan dan teknik. Karakteristik dari material berpori seringkali ditentukan oleh porositasnya. Dalam makalah ini, kami menyajikan menyajikan analisis pori dalam suatu material berdasarkan metode pengolahan citra. Suatu mikrograf dari mikroskopi elektron (SEM) kami analisis dengan menggunakan Wolfram Mathematica. Dari penelitian kami dapat diperoleh beberapa informasi tentang persentase pori (porositas), ukuran pori, aspek rasio, dan distribusi ukuran pori dalam material.Kata kunci: pori, pengolahan citra, Wolfram Mathematica

MELASTOMA MALABATHRICUM L. EXTRACTS-BASED INDICATOR FOR MONITORING SHRIMP FRESHNESS INTEGRATED WITH CLASSIFICATION TECHNOLOGY USING NEAREST NEIGHBOURS ALGORITHM Aliefia Noor; Evi J.; Aisyah D. A. T. Safitri; Mustari Mustari; Yuant Tiandho
SINERGI Vol 25, No 1 (2021)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2021.1.009

As a maritime country, shrimp commodity production in Indonesia is very high and continues to increase. However, because shrimp is a perishable food, we need a detection device. This is because conventional methods that are widely used by the community in detecting freshness of shrimp are only based on the smell. Of course, this is a problem when shrimp are packed in closed containers. In this paper, a method for detecting shrimp is proposed using the Melastoma malabathricum L. - based label indicator. The high content of flavonoids in the extracts allows the changing the colour of the label from red to grey due to the interaction between the label with the OH- group that arises from the shrimp spoilage process. The colour that appears on the label indicator will correlate with the level of shrimp freshness. By increasing detection effectiveness, the classification is performed using the nearest-neighbours algorithm, which is equipped with an image processing mechanism in the form of colour quantization. There are four classifications used to express the quality of shrimp, namely "acceptable," "just acceptable," "unacceptable," and "more unacceptable." The accuracy of applying this method is 71.9%, with the majority of detection errors occurring in the "acceptable" class. Based on these results, it can be stated that the label indicators prepared in this study are very promising to be developed into intelligent packaging components.

Implication of Negative Temperature in the Inner Horizon of Reissner-NordstrÃ¶m Black Hole Yuant Tiandho
Journal of Mathematical and Fundamental Sciences Vol. 49 No. 3 (2017)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2016.49.3.7

This paper reconsiders the properties of Hawking radiation in the inner horizon of a Reissner-NordstrÃ¶m black hole. Through the correlation between temperature and surface gravity, it is concluded that the temperature of the inner horizon is always negative and that of the outer horizon is always positive. Since negative temperature is hotter than any positive temperature, it is predicted that particle radiation from the inner horizon will move toward the outer horizon. However, unlike temperature, entropy in both horizons remains positive. Following the definition of negative temperature in the inner horizon, it is assured that the entropy of a black hole within a closed system can never decrease. By analyzing the conditions of an extremal black hole, the third law of black hole thermodynamics can be extended to multi-horizon black holes.

Utilization of Iron Scrap for Palm Oil Mill Effluent Treatment by Fenton and Foto-Fenton Processes Diana Novita Sari; Dea Amelia; Muhammad David Ramadhon; Yuant Tiandho
JURNAL SAINS NATURAL Vol. 12 No. 2 (2022): Sains Natural
Publisher : Universitas Nusa Bangsa

The increase in the amount of palm oil production impacts increasing the total liquid waste from the processing of palm oil. Palm oil mill effluent (POME) has high chemical oxygen demand (COD) and biochemical oxygen demand (BOD) parameters that can cause environmental pollution. This study processed POME using the Fenton mechanism using reagents derived from scrap iron. The Fenton mechanism is one of the advanced oxidation process technology (AOPs) in wastewater treatment. To improve the performance of the Fenton mechanism, the researchers integrated it with UV-rays in the photo-Fenton mechanism scheme. Fenton and photo-Fenton processes effectively reduce the pH, BOD, and COD of POME. The COD removal efficiency was 99.91%, while the BOD removal efficiency was 99.93%. The more FeSO4 added to the wastewater, the more significant the reduction of BOD and COD in the Fenton and photo-Fenton processes. Also, photo-Fenton is more effective than the Fenton process to reduce BOD and COD in the POME.Keywords:Â POME;Â Fenton;Â Photo-Fenton; Scrap ironABSTRAKPemanfaatan Besi Bekas untuk Pengolahan Limbah Cair Industri Kelapa Sawit Melalui Proses Fenton dan Foto-FentonMeningkatnya jumlah produksi kelapa sawit, berdampak pada peningkatan total limbah cair dari hasil pengolahan kelapa sawit. Limbah cair industri kelapa sawit atau Palm Oil Mill Effluent (POME) memiliki nilai parameter chemical oxygen demand (COD) dan biochemical oxygen demand (BOD) yang tinggi sehingga dapat menyebabkan pencemaran lingkungan. Di dalam penelitian ini, dilakukan pengolahan POME menggunakan mekanisme Fenton menggunakan reagen yang berasal dari besi bekas. Mekanisme Fenton adalah salah satu pengembangan dari teknologi proses oksidasi maju (AOPs) dalam pengolahan air limbah. Â Untuk meningkatkan performa dari mekanisme Fenton, peneliti mengintegrasikan system tersebut dengan sinar-UV dalam skema mekanisme foto-Fenton. Proses Fenton dan foto-Fenton sangat efektif dalam menurunkan pH, BOD dan COD dari POME. Efisiensi penyisihan COD mencapai 99,91%, sedangkan efisiensi penyisihan BOD mencapai 99,93%. Semakin banyak FeSO4 yang ditambahkan ke dalam air limbah maka semakin besar reduksi BOD dan COD dalam proses Fenton dan foto-Fenton. Selain itu, foto-Fenton lebih efektif dibandingkan dengan proses Fenton dalam mereduksi BOD dan COD dalam POMEKata kunci : POME; Fenton; foto-Fenton; besi bekas

Co-Authors Ahmad Fahrul Syarif Aisyah D. A. T. Safitri Aisyah D.A.T. Safitri Aisyah Deri Ayu Tungga Safitri Aliefia Noor Aliefia Noor Aliefia Noor Aliefia Noor Andi Gustomi Andrian Saputra Anggia, Suci Dwi Anisa Indriawati Anisah Mega Andini Asep Saefullah Asep Saefullah Dea Amelia Deden Nurdandi Diana Ayu Rostikawati Diana Novita Sari Diana Novita Sari Diana Novita Sari, Diana Novita Eri Gusnia Evi J Evi J Evi J Evi J. Evi.J Evi.J Faradis, Syuraya Fenni Vavionita Fitri Afriani Hamdini, Meri Herman Aldila Indra Pardede Isabela, Jennikita J., Evi Kristina, Yulietta Lingga, Rahmad M. Yonggi Puriza Mahjur Mahjur Marlina Marlina Maryana, Okky Megiyo Megiyo Meri Hamdini Muhammad B Hariyono Muhammad David Ramadhon Mustari Mustari Mustari Mustari Mustari Mustari Mustari Mustari Mustari Mustari Naswanto, Sekar Kinanti Ramadhini Ningrum, Choirunnisa Dwi Ayu Nizar, Ahlun Noor, Aliefia Patilawati, Pariza Pratama, Erick Aryana Purwati Purwati Putra, Alfryan Maulana Rafsanjani, Rifqi Almusawi Rahmad Lingga Ramadina, Salsabila Redi Randika Rifqi A. Rafsanjani Rifqi Almusawi Rafsanjani Rifqi Almusawi Rafsanjani Rifqi Almusawi Rafsanjani Rika Favoria Gusa Robin Robin Safitri, Aisyah D. A. T. Salsabila Ramadina Sandi Sandi Sari, Prada Siswoyo Siswoyo Susanti Susanti Tri Kusmita Umi Alawiyah Umi Awaliyah Wahri Sunanda Widodo B. Kurniawan Widodo Budi Kurniawan Wulandari, Rossariana Yekti Widyaningrum Yekti Widyaningrum Zaitun

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