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Jurnal Fisika : Fisika Sains dan Aplikasinya
Published by Universitas Nusa Cendana
ISSN : 25035274     EISSN : 26571900     DOI : https://doi.org/10.35508/fisa
Core Subject : Science, Engineering,
Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
Jurnal Fisika – Fisika Sains dan Aplikasinya diterbitkan oleh Jurusan Fisika, Fakultas Sains dan Teknk - Universitas Nusa Cendana secara berkala (setiap 6 bulan) yaitu setiap bulan April dan Oktober, dengan tujuan untuk menyebarluaskan hasil penelitian, pengkajian, dan pengembangan bidang Fisika beserta dengan terapan ilmu fisika. Artikel yang dipublikasi dalam Jurnal FiSA dapat berupa Artikel Penelitian maupun Artikel Konseptual (non-penelitian).
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Articles 214 Documents
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ADSORPSI ZAT WARNA NAPHTOL MENGGUNAKAN ADSORBEN KULIT BUAH KAKAO (Theobroma cacao L.) Novita Santalia Nika; Imanuel Gauru; Luther Kadang; Theodore Y. K. Lulan
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 7 No 1 (2022): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

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Abstract

Abstrak Penelitian adsorpsi zat warna naphtol menggunakan adsorben kulit buah kakao (Theobroma cacao L.) telah dilakukan. Penelitian ini bertujuan untuk mengetahui karakteristik adsorben arang aktif kulit buah kakao (Theobroma cacao L.), mengetahui pengaruh pH, waktu kontak dan konsentrasi adsorpsi arang aktif kulit buah kakao (Theobroma cacao L.) terhadap zat warna naphtol dan mengetahui kapasitas adsorpsi arang aktif kulit buah kakao (Theobroma cacao L.) terhadap zat warna naphtol. Metode yang digunakan dalam penelitian ini adalah adsorpsi. Hasil yang diperoleh yaitu karakteristik dari adsorben arang aktif kulit buah kakao hasil analisis FTIR menunjukan bahwa adsorben kulit buah kakao teraktivasi HCL mengandung gugus fungsi –OH, C-H, CH2, C-O dan C=C aromatik, hasil analisis SSA diperoleh luas permukaan sebesar 178,10 m2/g, dengan volume pori sebesar 0,16 cc/g dan ukuran pori sebesar 1,80 nm. Kondisi optimum adsorben arang aktif kulit buah kakao terjadi pada pH 4, waktu kontak 90 menit dan konsentrasi 60 ppm. Kapasitas adsorpsi arang aktif kulit buah kakao dalam mengadsorpsi zat warna naphtol adalah sebesar 5,8651 mg/g. pola isoterm adsorpsi mengikuti isoterm langmuir dengan nilai R2 sebesar 0,8275 dan energi adsorpsi sebesar 25,627905 KJ/mol. Abstract Research on the adsorption of naphtol dyes using cocoa pods (Theobroma cacao L.) as an adsorbent has been carried out. This study aims to determine the characteristics of the adsorbent of activated charcoal cocoa pods (Theobroma cacao L.), determine the effect of pH, contact time and adsorption concentration of activated charcoal cocoa pods (Theobroma cacao L.) on naphtol dyes and determine the adsorption capacity of activated charcoal skins. cocoa pods (Theobroma cacao L.) against naphtol dyes. The method used in this research is adsorption. The results obtained are the characteristics of the activated charcoal adsorbent of cocoa pods. FTIR analysis results show that the adsorbent of activated cocoa pods HCL contains functional groups –OH, CH, CH2, CO and C=C aromatics, the results of SSA analysis obtained a surface area of ​​178.10 m2/g, with a pore volume of 0.16 cc/g and a pore size of 1.80 nm. The optimum condition of activated charcoal adsorbent of cocoa pods occurred at pH 4, contact time of 90 minutes and concentration of 60 ppm. The adsorption capacity of activated charcoal of cocoa pods in adsorption of naphtol dye was 5.8651 mg/g. The adsorption isotherm pattern followed the Langmuir isotherm with an R2 value of 0.8275 and an adsorption energy of 25.627905 KJ/mol.
SOME RESEARCH MILESTONES WHERE CHEMISTRY AND NUTRITION ARE INEXTRICABLY INTERTWINED Frans Umbu Datta; Christina Olly Lada
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 7 No 1 (2022): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

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Abstract

Abstract History, as always, helps us reflect on our humble beginnings or maybe our golden era. It is an invaluable learning curve for those who learned anything through reflection before doing anything else. This review is an effort to raeveal briefly some of the research milestones that lead to the progressive development of the science of nutrition with the support of chemistry. The experiment of Lavoisier on carbon dioxide production in the late eighteen century has set the scene. Chemistry and nutrition, together, have accomplished so much and contributed to human lives. Our improved health and the provision of healthy animal products for human consumption are some examples. Chemistry has assisted nutritionists in better comprehending the mechanisms of actions of nutrients in the prevention and therapy of some diseases besides their metabolic roles and maintenance of body functions in animals and humans. The most recent findings demand a better understanding of cascades of structural changes of nutrients during digestion and assimilation. Personalised nutrient recommendations and precision nutrition will be the future of nutrition science, where chemistry remains its backbone.
PEMBELAJARAN RESILIENT BACKPROPAGATION DENGAN CIRI MOMENT INVARIANT DAN WARNA RGB UNTUK KLASIFIKASI BUAH JERUK KEPROK Derwin R. Sina; Dedy Dura; Yelly Y. Nubuasa
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 7 No 1 (2022): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v7i1.7378

Abstract

Abstract Jeruk keprok merupakan salah satu komoditas yang beredar luas dipasaran. Proses pemasaran harus melalui proses klasifikasi jeruk keprok kedalam kelompok baik dan cacat. Proses klasifikasi pada penelitian ini menggunakan pengolahan citra digital dan jaringan saraf tiruan (JST). Bidang ilmu citra berfungsi untuk mendapat ciri moment invariant dan warna RGB sedangkan jaringan saraf tiruan untuk proses pembelajaran menggunakan metode resilliant bankpropagation. Penelitian ini mengunakan 320 data citra, berasal dari 17 buah jeruk keprok dimana 10 buah diambil dari 4 sisi berbeda dengan jumlah 40 buah dan 7 buah diambil dari 5 sisi yang berbeda dan dikenakan rotasi sebanyak 8 kali (0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°) dengan jumlah 280 citra. Penggujian dilakukan sebanyak 10 kali terhadap parameter neuron hidden 5, 7 dan 10 dan learning rate 1, 0.1 dan 0.001. Hasil pengujian menunjukan kombinasi parameter terbaik adalah 5 neuron hidden pada learning rate 0,1 dengan nilai akurasi sebesar 99,80% dan waktu pengujian 3,092 ms. Kata kunci: Jeruk keprok; citra; jaringan saraf tiruan (JST); moment invariant; RGB; resilient backpropagation. Abstract Tangerines are one of the commodities which is widely distributed in the market. The marketing process should be going through a classifying process into good or defective clusters. The classification process in this research used Digital Image Processing and Artificial Neural Network. The field of image science operates to obtain moment invariant features and RGB colors while the artificial neural network for the learning process uses the resilliant bankpropagation method. This research utilized 320 image data from 17 tangerines where 10 of them were captured from 4 dissimilar sides with total of 40 images and 7 fruits were captured from 5 different sides and was rotated 8 times (0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°) with a total of 280 images. The testing performed was 10 times towards the neuron hidden 5, 7 and 10 and learning rate 1, 0.1, and 0.001. The result shown the best parameter combination was 5 neuron hidden on 0.1 learning rate with the accuracy value of 99.80% and a test time of 3.092 ms. Keywords: Tangerines; image; artificial neural network (ANN); moment invariant; RGB; resilient backpropagation.
POTENSI ARANG AKTIF DARI KAYU POHON GAMAL (GLIRICIDIA SEPIUM) SEBAGAI MEDIA FILTRASI AIR Debi Lodo Ratu; Redi Kristian Pingak; Andreas Christian Louk; Jehunias Leonidas Tanesib; Minsyharil Bukit
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 7 No 2 (2022): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v7i2.9339

Abstract

Penelitian ini bertujuan untuk menurunkan tingkat salinitas air payau asal Lobohede Kabupaten Sabu Raijua dengan menggunakan arang aktif dari kayu pohon gamal sebagai media filtrasi. Kayu pohon gamal dikarbonisasi, kemudian aktivasi secara fisika dengan variasi waktu 1,1.5, dan 2 Jam dengan suhu tetap 8500C dan aktivasi secara kimia dengan variasi waktu perendaman 4,5, dan 6 jam dengan aktivator ZnCl2 kadar 25%. Pengujian arang aktif meliputi daya serap air, kadar abu, kadar air, kadar zat mudah menguap, dan kadar karbon terikat bertujuan untuk mengetahui potensi arang aktif sebagai media filtrasi air sesuai SNI 06-3730- 1995. Filtrasi air payau yang dilakukan dengan tiga variasi media filtrasi dengan susunan media tanpa arang aktif yakni (kerikil,pasir,dan kain kasa), penambahan arang aktif kayu gamal, penambahan arang aktif komersil. Salinitas awal air 0,7 ‰, salinitas air aktivasi secara kimia untuk ketiga sampel 0,6 ‰, aktivasi secara fisika( 1 jam 0,6 ‰, 1,5 dan 2 jam 0,5 ‰), sedangkan dengan penambahan arang aktif komersil 0,7 ‰. Berdasarakan perbandingan aktivasi secara fisika dan kimia dengan arang aktif komersil nilai salinitas terbaik terdapat pada aktivasi secara fisika waktu 1,5 dan 2 jam sebesar 0,5 ‰ karena pada pengujian kadar zat mudah menguap 25% dan kadar abu 10% sesuai dengan SNI 06-3730-1995.
ANALISIS TEGANGAN DI POROS ENGKOL YAMAHA RX KING TAHUN 2005 MENGGUNAKAN PERANGKAT LUNAK SOLIDWORK Emanuel G. N Dhey; Ishak S. Limbong; Matheus M. Dwinanto
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 8 No 1 (2023): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v8i1.11816

Abstract

The crankshaft is one of the main components that converts the potential energy of the fuel into rotating power for the piston engine. Because in the process of working the crankshaft changes the piston's back and forth motion into a rotating motion of the shaft. To minimize the effects of damage that occurs due to various types of dynamic loads acting on the crankshaft components, the design process should first know the working stress distribution. Meanwhile, as a tool in analyzing it, Solidworks software is used. From the results of this analysis, the location or position of the damage due to too high a loading can be identified early. This the authors in this study want to raise a title, namely "Analysis of Stress in the Crankshaft Yamaha Rx-King Year 2005 Using Solidwork Software". Based on the results of the theoretical calculation with the radial force loading of 1.4 N, the bending moment is 10388.1 N / mm, the normal stress is 33.76 N / mm2 , the shear stress is 10.328 N / mm2, the maximum stress is 33.21 N / mm2, and the minimum stress is 3.55N / mm2. Based on the simulation results with solidwork software, the maximum stress is 4,83511e-007 N / m2. FOS (factor of safety) based on analysis using software obtained by 4.339e + 004 N / m2.
VISUALISASI FENOMENA HARMONIS DAN CHAOS PADA GETARAN TERGANDENG BERBASIS KOMPUTASI NUMERIK RUNGE KUTTA Leonora L. R. Trifina; Ali Warsito; Laura A. S. Lapono; Andreas Ch. Louk
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 8 No 1 (2023): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v8i1.11817

Abstract

Research has been carried out on the visualization of harmonic and chaos phenomenont on coupled vibration physcal case using the Runge Kutta numerical computation method with the aim of applying the first to fourth order Runge Kutta computation method to obtain a second order differential equation solution on coupled vibration system, calculating the displacement value of objects using computation method Runge Kutta order first to fourth, obtained a graph of the displacement of objects againts time in case of coupled vibration for harmonic and chaos states at certain step width values and compare the convergence of the Runge Kutta method from first to fourth order with the special analytical method. The solution of coupled vibration equation which is classified as a second order differential equation was quite difficulted to solve analytically, so the Runge Kutta computation method was used to solve it as an alternative solution. The results of the research showed that the harmonic state of the system was obtained when the displacement graph showed the motion of each pendulum which was constant with the pendulum displacement position with respect to time in the form of a sinusoidal graph at a value of C1 = 40 N/m, C2 = 30 N/m, C = 10 N/m, C = 0 N/m and the chaotic state was represented by a graph of the displacement of the pendulum with respect to time with an irregular pattern. In this case, it was found that the fourth order Runge Kutta method converged faster than the first to third order Runge Kutta method with the best results obtained at a step width value of 0,001. The fourth order Runge Kutta method also has a smaller approximation average error value from first to third order Runge Kutta method was on the fourth order Runge Kutta method and the avarage error values are , and on the Runge Kutta method of first to third order.
PEMODELAN DUA DIMENSI (2D) BAWAH PERMUKAAN PULAU ADONARA DENGAN DATA ANOMALI GRAVITASI K. K. Lesu; Jehunias L. Tanesib; Bernandus Bernandus
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 8 No 1 (2023): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v8i1.11819

Abstract

Geophysical research has been carried out using the gravity method on Adonara island in east Flores Regency, East Nusa Tenggara. This study aims to determine the subsurface rock geological conditions of the research area using free air gravity anomaly data from GGMplus and ERTM2160. The data is reduced by atmospheric correction, simple bouguer correction, curvature correction to produce a complete bouguer anomaly. After correction, regional anomalies and residual anomalies are separated. Then 2-dimensional (2D) modeling is carried out using forward modeling and inversion modeling with Grav2DC software. The results of the study show that the subsurface geological conditions of Adonara island are dominated rock by andesite, granite, diorite, dolomite, gravel, sandstone, basalt, sekis, metamorphic, shale and lavas.
MENENTUKAN NILAI PERIODE, AMPLITUDO, FREKUENSI DAN MEMVISUALISASI GETARAN HARMONIK PADA PEGAS DALAM BENTUK GELOMBANG Heri Rismawan; Muktamar Cholifah Aisiyah
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 8 No 1 (2023): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v8i1.11820

Abstract

Simple harmonic motion is motion back and forth regularly through an equilibrium point with the number of vibrations in every second always the same or constant. This experiment focuses on one example of an elastic object, namely a spring. The response of the spring to the force is indicated by the increase in the length of the spring. The background of this harmonic vibration experiment is to explain the process of harmonic vibration of a spring which is visualized in waves with the aim of explaining the harmonic vibration of a spring which is visualized in a wave. The data collection method in this experiment only used 1 load, namely 2 variations of springs (single spring and series spring) with a distance of 2 cm, 4 cm, and 6 cm. Different values ​​of A, y0, and c are obtained. From all the data that has been processed using the Orgin Arduino software application, it can be seen that the value of the amplitude is 0.46 cm-6.23 cm. The period value is 10.6 seconds-17.9 seconds and the frequency is 0.05 Hz-0.09 Hz. In addition, the initial phase value of -0.08 to -4.96 was also obtained. From the results of this experiment, the spring that has the largest amplitude value of 6.23 cm is a variation of the series spring with a deviation of 6 cm. While the spring which has the greatest period, frequency, and initial phase values ​​is the variation of spring 1 with a deviation of 4 cm. Based on the experimental results show that, the vibrations that occur in the spring are different in the form of waves. This is because the distance and the spring used during the experiment affect the shape of the waves that occur.
PENGARUH DOPAN ZN PADA BAHAN BARIUM HEKSAFERIT TERHADAP UKURAN KRISTAL DAN SIFAT MAGNETIK Ahmad Fauzi; Hernowo Widodo; Murwan Widyantoro
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 8 No 1 (2023): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v8i1.11821

Abstract

Barium hexaferrite material as magnetic material can be used for wave absorption applications. However, to make the absorber material, the material must be soft magnetic material. For now, the barium hexaferrite problem is still a hardmagnetic material. To form softmagnetic material modified by doping Zn metal into barium hexeferite. The purpose of this study was to determine the Zn Doping effect in barium hexaferrite material on crystal size and magnetic properties. Zn doping into barium hexaferrite (BaFe12-xZnxO19) with doping variation of Zn x = 0, 0.4, 0.6, and 0.8. The method used in this study is the mechanical millling method, while the crystal size test and magnetic properties use XRD characterization tools and Permagraph. The results showed that the smaller the crystal size of 151.509 nm if given Zn doping with variations in the addition of x = 0.8 and permagraph test results from doping variation Zn x = 0.8 obtained the magnetic properties in the form of coercivity values of 58.97 kA / m, the value magnetic remanent of 0.083 Tesla, magnetic saturation value of 0.1402 Tesla and the energy of the product is 1.2 kJ/m2. The test results concluded that the size of the crystals and the coercivity values were reduced if given the addition of excess Zn. this shows that Zn doping on barium hexaferrite is able to reduce the size of the crystal and its magnetic properties. Changes in crystal size and coercivity values become smaller indicating that the material is soft magnetic material.
RANCANG BANGUN ALAT DESTILASI AIR LAUT MENGGUNAKAN TENAGA MATAHARI SEBAGAI ALTERNATIF PENYEDIAAN AIR BERSIH Dewahastu Gaib; Asri Arbie; Dewa Gede Eka Setiawan
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 8 No 1 (2023): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v8i1.11822

Abstract

Unfortunately, there has been a great worry about clean and healthy water for human consumption lately. Even though 2/3 of the earth's surface is covered by water, the access to safe water is only concentrated in certain areas. In Indonesia, water scarcity is increasing each year. Recent data on freshwater resources possessed by all countries in the world shows that Indonesia is ranked 51st with the highest risk of water scarcity (40-80%). There are several methods to gain access to safe water, one of which is the use of distillation equipment. This research aims to produce a design of freshwater distillation equipment from seawater by utilizing solar radiation towards the quantity of freshwater and to determine the quality of freshwater from the results of distillation which include water pH, salinity, and TDS tests. The research method is done by heating sea water in the distillation equipment using solar radiation. Findings reveal that the average solar intensity of 1608.25 (lux) and the ambient temperature of 38.5 °C can produce an average volume of freshwater of 336.75 ml per day from the incoming seawater volume of 2000 ml. The water quality produced has a pH of 6.5, a salinity of 0.2 ppt, and a TDS of 152 mg/L.

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