Jurnal Fisika : Fisika Sains dan Aplikasinya http://ejurnal.undana.ac.id/FISA <p><strong>p-ISSN :&nbsp;<a href="http://u.lipi.go.id/1461570616" target="_blank" rel="noopener">2503-5274</a> (Printed)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;e-ISSN : <a href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1554973637&amp;1&amp;&amp;2019" target="_blank" rel="noopener">2657-1900</a> (Online)</strong><br><strong><a href="https://doi.org/10.35508/fisa" target="_blank" rel="noopener">doi : https://doi.org/10.35508/fisa</a></strong><br>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). <br> <strong>JFISA INDEXED BY :</strong> <br><a title="Jurnal Fisika Sains dan Aplikasinya" href="https://ejurnal.undana.ac.id/FISA" target="_blank" rel="noopener"><img src="/RujUxYuks/site/images/clouk/LogoIndeks.png"></a></p> Universitas Nusa Cendana en-US Jurnal Fisika : Fisika Sains dan Aplikasinya 2503-5274 <p><strong>Published By</strong>&nbsp;<a title="Universitas Nusa Cendana" href="http://undana.ac.id/" target="_blank" rel="noopener"><img src="/RujUxYuks/site/images/clouk/undana.png"></a></p> <p>Jl. Adisucipto, Penfui-Kupang, Lasiana, Klp. Lima, Kota Kupang, Nusa Tenggara Timur., Indonesia</p> <p><a title="CC-BY-NC-ND 4.0" href="http://creativecommons.org/licenses/by-nc-nd/4.0" target="_blank" rel="noopener"><img src="/RujUxYuks/site/images/clouk/Attrib1.png"></a></p> <p>This work is licensed under <a title="CC-BY-NC-SA 4.0" href="http://creativecommons.org/licenses/by-nc-sa/4.0" target="_blank" rel="noopener">Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)</a></p> SIMULASI PEREDAMAN GETARAN PADA PEGAS KATUP (VALVE SPRING) SISTEM HIDROLIK DENGAN METODE PID MEMANFAATKAN SIMULINK MATLAB http://ejurnal.undana.ac.id/FISA/article/view/890 <p><em>A simulation of damping vibration on valve spring hydraulic system has been done. This research is a study of the simulation that aims to control excess vibration on valve spring hydraulic system as a result of excitation force that is affected by the changes of pressure periodically, to produce a stable system. The simulation performed by using Matlab simulink with applying a PID method (P, PD, PI and PID) and noticed to variations of proportional constant (Kp), integral constant (Ki) and the derivative constant (Kd).</em></p> <p><em>The simulation results obtained show that by combining these three constants Ki, Kp and Kd can dampen the vibration better. For the total excitation force, using the value of Kp = 10<sup>6</sup>, Ki = 7 x 10<sup>6</sup> and Kd = 6 x 10<sup>4</sup> can provide damping vibration system response on valve spring with a rise time of 1.2119 s, settling time of 1.2792 s, stable at setpoint 1, error steady state 0% and a small maximum overshoot of 0.3309. This is the result of a stable system response and best compared to the other combinations of the constant values.</em></p> <p><em>&nbsp;</em></p> <p><strong><em>Keywords : vibration, damper, valve spring, hydraulic system, PID method.</em></strong></p> Keszya Wabang Ali Warsito Andreas Christian Louk ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 1 10 10.35508/fisa.v5i1.890 INVESTIGASI KANDUNGAN RADIOISOTOP DALAM SAMPEL BATUAN DI MUARA SUNGAI SUMLILI KUPANG BARAT http://ejurnal.undana.ac.id/FISA/article/view/1235 <p><strong>A</strong><strong>bstrak</strong></p> <p><em>Masalah pokok yang dikaji di penelitian ini adalah pemetaan dan analisis aktivitas jenis kandungan radioisotop dalam sampel batuan di muara sungai Sumlili Kupang Barat. Tujuan penelitian meliputi : menentukanrange cacah dan aktivitas jenis massa (C) kandungan radioisotop dalam sampel pasir&nbsp; di muara sungai Sumlili Kupang Barat, mengestimasi tingkat kontaminasi radioisotop sesuai standar di sekitar muara sungai Sumlili, dan memetakan sebaran cacah radioisotop pada luasan daerah tertentu yang terjangkau survei di lapangan. Metode penelitian meliputi : observasi/survei, sampling, serta analisis dan interpretasi data. Kisaran cacah radiasi di lapangan, di laboratorium, dan nilai aktivitas jenis massa kandungan radioisotop dalam 52 sampel pasir dari lokasi penelitian dimuara sungai Sumili Kupang Barat secara berturut-turut adalah 19 cpm sampai dengan 60 cpm, 29 cpm sampai dengan 73 cpm, dan&nbsp; 0,107 x 10<sup>-5</sup>μCi/gram sampai dengan 0,269 x 10<sup>-5</sup>μCi/gram. Berdasarkan kontur dan kurva tiga dimensi radiasi cacah radioisotop dalam sampel pasir di lapangan dan di laboratorium serta kontur dan kurva tiga dimensi aktivitas jenis massa di muara sungai Sumlili Kupang Barat dapat diketahui bahwa sebaran kontaminasi radioisotop di muara sungai Sumlili Kupang Barat&nbsp; lebih tinggi ke arah barat dan cenderung menurun ke arah timur. Hasil perhitungan aktivitas jenis massa kandungan radioisotop dalam sampel pasir di muara sungai Sumlili Kupang Barat, termaksud dalam kontaminasi rendah untuk radiasi alpha (α) dan beta (β), namun daerah ini perlu diwaspadai karna terdapat beberapa titik di lapangan, cacah radiasi nuklir kandungan radioisotop dalam deposit mineral cukup tinggi melebihi standar IAEA.</em></p> <p><strong>Kata kunci<em> : </em></strong><em>Radioisotop, Aktivitas Jenis Massa, Daerah Kontaminasi.</em></p> <p><strong><em>ABSTRACT</em></strong></p> <p><em>The main problem studied in this study is mapping and analyzing the activity of the types of radioisotope content in rock samples at the mouth of the Sumlili river in West Kupang. The research objectives included: determining the counting range and mass type activity (C) radioisotope content in the sand samples at the Sumlili River mouth in West Kupang, estimating the level of radioisotope contamination according to the standards around the Sumlili river estuary, and mapping the distribution of radioisotope counts in the area covered by surveys in field. Research methods include: observation / survey, sampling, and analysis and interpretation of data. The range of radiation counts in the field, in the laboratory, and the value of the type of mass activity of radioisotope content in 52 sand samples from the study locations in the West Kupang Sumili River are 19 cpm to 60 cpm, 29 cpm to 73 cpm, and 0.107 x 10-5μCi / gram up to 0.269 x 10-5μCi / gram. Based on the three-dimensional contour and curve of radiation from radioisotope counts in sand samples in the field and in the laboratory and three-dimensional contours and curves the activity of mass types in the Sumlili estuary of West Kupang can be seen that the distribution of radioisotope contamination in the Sumlili estuary of West Kupang is higher west and tends to decline to the east. The results of the calculation of the type of mass activity of radioisotope content in sand samples at the mouth of the Sumlili River in West Kupang, are referred to in low contamination for alpha (α) and beta (β) radiation, but this area needs to be watched out for there are several points in the field, nuclear radiation in mineral deposits quite high exceeding IAEA standards.</em></p> <p><strong>Keywords</strong><strong><em> : </em></strong><em>Radioisotopes, Mass Type Activities, Contamination Areas.</em></p> Yosefina Molo Bartholomeus Pasangka Jehunias Leonidas Tanesib ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 11 18 10.35508/fisa.v5i1.1235 KARAKTERISASI SIFAT FISIK DAN KIMIA SERTA GAMBARAN AIR TANAH PADA SUMUR-SUMUR DI SEPANJANG KELURAHAN MERDEKA KECAMATAN KUPANG TIMUR KABUPATEN KUPANG http://ejurnal.undana.ac.id/FISA/article/view/1386 <p><strong>ABSTRAK</strong></p> <p><em>Penelitian karakterisasi sifat fisik dan kimia serta gambaran air tanah pada sumur-sumur di sepanjang Kelurahan Merdeka Kecamatan Kupang Timur Kabupaten Kupang telah dilakukan. Penelitian ini bertujuan untuk menggambarkan dan mengetahui kelayakan air pada sumur-sumur berdasarkan nilai salinitas, kadar oksigen terlarut (DO), tingkat keasaman (pH), suhu dan konduktivitas air tanah. Pengambilan data menggunakan alat-alat portable dan diolah menggunakan surfer 13 dan arcgis 10. Hasil penelitian menunjukkan bahwa yang nilai dari masing-masing parameter bervariasi karena ada beberapa faktor lingkungan. Secara keseluruhan nilai-nilai tersebut sesuai dengan standar kelayakan air layak konsumsi.</em></p> <p><strong>Kata kunci :&nbsp; Salinitas, Kadar Oksigen Terlarut, Derajat Keasaman, Suhu, Konduktivitas</strong></p> <p><em>&nbsp;</em></p> <p><strong>ABSTRACT</strong></p> <p><em>Research on the characterization of the physical and the chemical of groundwater in wells along Merdeka Village Kupang East District of Kupang Regency had been done.This research aims to describe and to know the feasible of water in the wells based on salinity, dissolved oxygen(DO), acidity(pH), temperature, and conductivity of groundwater. Data retrieval used portable tools and processed by&nbsp; surfer 13 and Arcgis 10. The result varies because there are several environmental factor. Overall these values are suitable in the standard of feasible water consumption.</em></p> <p><strong>Keyword : Salinity, Dissolved Oxygen Levels, Acidity, Temperature, Conductivity</strong></p> Dolin Marlince Tameno Abdul Wahid Albert Zicko Johannes ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 19 24 10.35508/fisa.v5i1.1386 FLUORESCENCE AND RED SHIFT OF THE PHOTOPHYSICAL PROPERTIES FROM PROTONATED SMALL MOLECULE http://ejurnal.undana.ac.id/FISA/article/view/1514 <p>In this work, the fluorescence (FL) and bathochromic of the photophysical properties from protonated small molecule in cast film state have been investigated. To realize these purposes, the material of 4’,4’’’’-(1,4-phenylene bis (2,2’:6’,2”-terpyridine) (Phtpy) as a small molecule and &nbsp;camphorsulfonic acid (CSA) as an acid for protonation was selected. For Phtpy, its maxima absorption is 300 nm and no FL color emission. After CSA solution was added in chlorofom solution of Phtpy, the absorption spectrum of protonated Phtpy is broaden to longer wavelength with two new peaks appear at around 350 and 370 nm. Upon direct excitation at wavelength of 300 nm, the range of FL spectrum of original and protonated Phtpy is from 320 to 580 nm and from 370 to 580 with their maxima FL intensities at 360 and 460 nm. Interestingly, protonated Phtpy emits blue FL color emission. In addition, energy gap of protonated Phtpy is smaller than that of pristine Phtpy. Finally, the FL &nbsp;and remarkable red shift of absorption and FL spectra of protonated Phtpy will pave the way to develop sensor and other photonic devices with high performances in the ultaviolet region.</p> Zakarias Seba Ngara ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 25 29 10.35508/fisa.v5i1.1514 PEMETAAN ZONA POTENSI TAMBANG MANGAN DAERAH NAIP KABUPATAN TIMOR TENGAH SELATAN DENGAN METODE GEOMAGNETIK http://ejurnal.undana.ac.id/FISA/article/view/1533 <p><strong>Abstrak</strong></p> <p><strong>&nbsp;</strong></p> <p><em>Telah dipemetakan zona potensi tambang mangan daerah </em><em>Naip K</em><em>abupatan Timor Tengah Selatan menggunakan metode geomagnetik. Tujuan penelitian ini adalah mengetahui s</em><em>truktur perlapisan </em><em>dan pola sebaran batuan </em><em>bawah permukaan yang diduga mengandung </em><em>mangan. Hasil penelitian diinterpretasikan secara kualitatif dan kuantitatif. Interpretasi kualitatif menunjukkan anomali rendah bernilai antara -10 sampai &lt; 50 nT sebagian besar berada pada bagian selatan dan anomali tinggi yaitu </em><em>&nbsp;50 sampai 220 nT, umumnya terdapat di bagian utara lokasi penelitian. Anomali rendah diinterpretasikan sebagai batuan lempung dan anomali tinggi diinterpretasikan batugamping yang berasosiasi dengan mangan dan batuan metamorf. Untuk interpretasi kuantitatif menunjukkan keberadaan batuan mangan diduga berasosiasi dengan batugamping yang berada pada bodi 1A sayatan 1 (A-A1) dengan nilai suseptibilitas 0,008116, bodi 1B sayatan 2 (B-B1) yang memiliki nilai suseptibilitas 0,001967 serta bodi 1C sayatan 3 (C-C1) untuk nilai suseptibilitas 0,006407. Bodi 1A sayatan 1 (A-A1) tersebar dari arah barat menuju timur laut, bodi 1B sayatan 2 (B-B1) mulai selatan ke utara dan bodi 1C sayatan 3 (C-C1) dengan arah barat daya menuju timur laut.</em></p> <p><em>&nbsp;</em></p> <p><strong><em>Kata kunci</em></strong><em>: Mangan, suseptibilitas, metode geomagnetik</em></p> <p><em>&nbsp;</em></p> <p><strong>Abstract</strong></p> <p><strong>&nbsp;</strong></p> <p><em>An mapping of the potential Manganese mining zones has been done at Naip areas of the South Central Timor Regency using geomagnetic method. The purpose of this study was to determine the bedding structure and the subsurface patterns of rocks distribution that suspected contain manganese. The result of research were interpreted qualitatively and quantitatively. Qualitative interpretation shows that the low anomaly between -10 to &lt;50 nT is mostly in the southern part and the high anomaly is ≥ 50 to 220 nT, generally in the northern part of the study area. The l</em><em>ow anomaly is interpreted as clay and high anomaly is interpreted as limestone associated with manganese and metamorphic rocks. For quantitative interpretation, the presence of manganese is suspected to be associated with limestone </em><em>at a depth of 6.2-100 m in </em><em>body 1A incision 1 (A-A1) with susceptibility value 0.008116, body 1B incision 2 (B-B1) which has susceptibility value 0.001967 and body 1C incision 3 (C-C1) for the susceptibility value of 0.006407. Body 1A incision 1 (A-A1) is spread from west to northeast direction, body 1B incision 2 (B-B1) starts south to north and body 1C incision 3 (C-C1) is southwest toward northeast.</em></p> <p><em>&nbsp;</em></p> <p><em>Keywords: Manganese, susceptibility, geomagnetic methods</em></p> Hadi Imam Sutaji Abdul Wahid Ali Warsito ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 30 36 10.35508/fisa.v5i1.1533 PENGARUH VARIASI JARAK ANTARA KATUP LIMBAH DENGAN KATUP PENGHANTAR TERHADAP EFISIENSI POMPA HIDRAM PVC 2 INCHI PARAREL http://ejurnal.undana.ac.id/FISA/article/view/1947 <p><strong>Abstrak</strong></p> <p><em>Pompa</em><em> h</em><em>i</em><em>dram merupakan salah satu jenis pompa yang tidak membutuhkan energi listrik atau bahan bakar. Energi potensial dari sumber air yang dialirkan sebagai daya penggerak. Dimana alat ini bekerja pada sumber air yang memiliki kemiringan, sebab alat ini membutuhkan energi terjunan air dari ketinggian lebih besar atau sama dengan 1 meter yang masuk ke dalam pompa. </em><em>Dalam pengoperasinya pompa ini mempunyai keuntungan yaitu dengan menggunakan pipa PVC yang dengan sederhana merancangnya juga dapat dibuat dengan peralatan bengkel. Penelitian ini dilakukan untuk mengetahui pengaruh variasi jarak antara katup limbah dengan katup penghantar terhadap efisiensi pompa hydram.</em> <em>Metode</em><em> yang digunakan adalah experimen </em><em>lapangan</em><em> dengan </em><em>beberapa perubahan</em> <em>pada</em> <em>v</em><em>ariasi jarak antara katup limbah dengan katup penghantar adalah 10 </em><em>c</em><em>m, 20 </em><em>c</em><em>m</em><em>,</em><em>30 </em><em>c</em><em>m. </em><em>Dari hasil penelitian bahwa debit pemompaan optimum mengalami peningkatan pada ukuran pendek yaitu 0,00011633 m<sup>3</sup>/detik, debit limbah semakin besar pada ukuran jarak panjang yaitu 0,00086013 m<sup>3</sup>/detik, dengan jumlah ketukan terjadi yaitu 84 kali. Sehingga efisiensi hidram menurut teori d’aubussion diperoleh hasil tertinggi yaitu </em><em>7</em><em>1,02 %.</em></p> <p><strong>Kata Kunci: </strong>Pompa<em> h</em><em>i</em><em>dram 2 inchi, double katup limbah, katup penghantar, dan efisiensi </em><em>D’aubuission</em></p> <p><strong><em>Abstract</em></strong></p> <p><em>Hydram pump is one type of pump that does not require electricity or fuel. Potential energy from water sources that is channeled as a driving force. Where this tool works at a source of water that has a slope, because this tool requires water flow energy from a height greater than or equal to 1 meter into the pump. In the operation of this pump has the advantage of using PVC pipes which are simple to design can also be made with workshop equipment. This research was conducted to determine the effect of variations in the distance between the waste valve and the delivery valve on the efficiency of the hydram pump. The method used is a real experimental with some changes in the variation of the distance between the waste valve and the delivery valve is 10 cm, 20 cm, 30 cm. From the results of the study that the optimum pumping discharge increased in the short size of 0.00011633 m3 / second, the greater the discharge of waste at a long-distance size of 0.00086013 m3 / second, with the number of beats occurring at 84 times. So that the efficiency of hydrams according to the theory of 'aubussion obtained the highest yield of 71.02%.</em></p> <p><strong>Keywords</strong>: <em>2-inch hydram pump, double valve waste, delivery valve, and D'obuission efficiency.</em></p> Defmit B.N Riwu Dominggus G. H. Adoe Seprianus Rudolf Membubu ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 37 41 10.35508/fisa.v5i1.1947 ANALISIS KECENDERUNGAN (TREND) SUHU UDARA DAN CURAH HUJAN DI PULAU FLORES (LABUAN BAJO, RUTENG, MAUMERE, DAN LARANTUKA) http://ejurnal.undana.ac.id/FISA/article/view/1962 <p><strong>A</strong><strong>bstrak</strong></p> <p><em>Telah dilakukan penelitian&nbsp; analisis kecenderungan (trend) suhu udara dan curah hujan di Pulau Flores (Labuan Bajo, Ruteng, Maumere dan Larantuka). Tujuan penelitian ini untuk mengetahui profil suhu udara dan curah hujan serta mengetahui trend suhu udara dan curah hujan di Pulau Flores untuk daerah Labuan Bajo, Ruteng, Maumere, dan Larantuka. Data yang digunakan adalah data sekunder yang diperoleh dari BMKG Stasiun Klimatologi Kupang. Pengolahan data dengan&nbsp; menghitung rata-rata untuk mengetahui profil curah hujan dan suhu udara serta menggunakan metode regresi linear untuk menghitung trend suhu udara dan curah hujan. Berdasarkan pengolahan data, profil curah hujan di Pulau Flores untuk daerah Labuan Bajo, Ruteng, Maumere, dan Larantuka adalah Pola hujan Monsun, untuk profil suhu udara di Pulau Flores suhu udara rata-rata tertinggi terjadi pada bulan November sebesar 29,9<sup>0</sup>C dan suhu udara rata-rata terendah terjadi pada bulan Juli sebesar 18,5<sup>0</sup>C. Untuk trend curah hujan di Labuan Bajo mengalami trend penurunan sebesar -0,919 mm, Ruteng mengalami trend peningkatan sebesar 1,2688 mm, Maumere mengalami trend peningkatan sebesar 0,1442 mm, Larantuka mengalami trend peningkatan sebesar 0,2734 mm. Untuk Trend suhu udara di Labuan Bajo mengalami trend peningkatan sebesar 0,0347<sup>0</sup>C, Ruteng mengalami trend peningkatan sebesar 0,005<sup>0</sup>C, Maumere mengalami trend peningkatan sebesar 0,0144<sup>0</sup>C, dan Larantuka mengalami trend peningkatan sebesar 0,036<sup>0</sup>C.</em></p> <p><strong><em>Kata kunci</em></strong><em>: Perubahan iklim, trend, suhu udara, curah hujan</em></p> <p><strong><em>ANALYSIS OF TREND OF AIR TEMPERATURE </em></strong><strong><em>AND RAINFALL IN THE FLORES ISLAND (LABUAN BAJO, RUTENG, MAUMERE AND LARANTUKA)</em></strong><strong><em>&nbsp;</em></strong><strong><em>&nbsp;</em></strong><strong><em>&nbsp;</em></strong></p> <p><strong><em>ABSTRACT</em></strong></p> <p><em>Analysis of&nbsp; the trend rainfall and air temperature has been conducted on Flores Island (Labuan Bajo, Ruteng, Maumere and Larantuka). The purpose of this study was to determine the profile of air temperature and rainfall and determine air temperature and rainfall trend on the island of Flores for the areas of Labuan Bajo, Ruteng, Maumere, and Larantuka. Data obtained from BMKG Kupang Climatology Station. Data processing by calculating the average to determine the profile of rainfall and air temperature and using linear regression methods to calculate air temperature and rainfall trends. Based on data processing, rainfall profiles on Flores Island for the areas of Labuan Bajo, Ruteng, Maumere, and Larantuka are Monsoon Rain Patterns, for the temperature profile on Flores Island the highest average air temperatures occur in November at 29.9<sup>0</sup>C and the temperature the lowest average air occurred&nbsp; in July of 18,5<sup>0</sup>C. Rainfall trend in Labuan Bajo experienced a downward trend of -0.919 mm, Ruteng experienced an upward trend of 1.2688 mm, Maumere experienced an upward trend of 0.1442 mm, Larantuka had an upward&nbsp; trend of 0.2734 mm. For air temperature trends in Labuan Bajo experiencing an upward&nbsp; trend of 0.0347<sup>0</sup>C, Ruteng experiencing an upward trend of 0.005<sup>0</sup>C, Maumere experiencing an upward trend of 0.0144<sup>0</sup>C,and Larantuka experiencing an upward trend of 0.036<sup>0</sup>C.</em></p> <p><strong><em>Key words</em></strong><em>: climate change, trends, air temperature, rainfall</em></p> Fifi Novita Ambi Hadi Imam Sutadji Apolinaris S Geru Andreas Christian Louk ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 42 56 10.35508/fisa.v5i1.1962 PENGARUH VARIASI JARAK CHECK VALVE KATUP LIMBAH TERHADAP EFISIENSI POMPA HIDRAM http://ejurnal.undana.ac.id/FISA/article/view/2269 <p><strong>A</strong><strong>bstrak</strong></p> <p><em>Telah dilakukan penelitian&nbsp; analisis kecenderungan (trend) suhu udara dan curah hujan di Pulau Flores (Labuan Bajo, Ruteng, Maumere dan Larantuka). Tujuan penelitian ini untuk mengetahui profil suhu udara dan curah hujan serta mengetahui trend suhu udara dan curah hujan di Pulau Flores untuk daerah Labuan Bajo, Ruteng, Maumere, dan Larantuka. Data yang digunakan adalah data sekunder yang diperoleh dari BMKG Stasiun Klimatologi Kupang. Pengolahan data dengan&nbsp; menghitung rata-rata untuk mengetahui profil curah hujan dan suhu udara serta menggunakan metode regresi linear untuk menghitung trend suhu udara dan curah hujan. Berdasarkan pengolahan data, profil curah hujan di Pulau Flores untuk daerah Labuan Bajo, Ruteng, Maumere, dan Larantuka adalah Pola hujan Monsun, untuk profil suhu udara di Pulau Flores suhu udara rata-rata tertinggi terjadi pada bulan November sebesar 29,9<sup>0</sup>C dan suhu udara rata-rata terendah terjadi pada bulan Juli sebesar 18,5<sup>0</sup>C. Untuk trend curah hujan di Labuan Bajo mengalami trend penurunan sebesar -0,919 mm, Ruteng mengalami trend peningkatan sebesar 1,2688 mm, Maumere mengalami trend peningkatan sebesar 0,1442 mm, Larantuka mengalami trend peningkatan sebesar 0,2734 mm. Untuk Trend suhu udara di Labuan Bajo mengalami trend peningkatan sebesar 0,0347<sup>0</sup>C, Ruteng mengalami trend peningkatan sebesar 0,005<sup>0</sup>C, Maumere mengalami trend peningkatan sebesar 0,0144<sup>0</sup>C, dan Larantuka mengalami trend peningkatan sebesar 0,036<sup>0</sup>C.</em></p> <p><strong><em>Kata kunci</em></strong><em>: Perubahan iklim, trend, suhu udara, curah hujan</em></p> <p><strong>Abstract</strong></p> <p><em>Analysis of&nbsp; the trend rainfall and air temperature has been conducted on Flores Island (Labuan Bajo, Ruteng, Maumere and Larantuka). The purpose of this study was to determine the profile of air temperature and rainfall and determine air temperature and rainfall trend on the island of Flores for the areas of Labuan Bajo, Ruteng, Maumere, and Larantuka. Data obtained from BMKG Kupang Climatology Station. Data processing by calculating the average to determine the profile of rainfall and air temperature and using linear regression methods to calculate air temperature and rainfall trends. Based on data processing, rainfall profiles on Flores Island for the areas of Labuan Bajo, Ruteng, Maumere, and Larantuka are Monsoon Rain Patterns, for the temperature profile on Flores Island the highest average air temperatures occur in November at 29.9<sup>0</sup>C and the temperature the lowest average air occurred&nbsp; in July of 18,5<sup>0</sup>C. Rainfall trend in Labuan Bajo experienced a downward trend of -0.919 mm, Ruteng experienced an upward trend of 1.2688 mm, Maumere experienced an upward trend of 0.1442 mm, Larantuka had an upward&nbsp; trend of 0.2734 mm. For air temperature trends in Labuan Bajo experiencing an upward&nbsp; trend of 0.0347<sup>0</sup>C, Ruteng experiencing an upward trend of 0.005<sup>0</sup>C, Maumere experiencing an upward trend of 0.0144<sup>0</sup>C,and Larantuka experiencing an upward trend of 0.036<sup>0</sup>C.</em></p> <p><strong><em>Keywords</em></strong><em>: climate change, trends, air temperature, rainfall</em></p> Defmit B.N Riwu Jack C.A Pah Simplisius Fridolin Akoit ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 57 60 10.35508/fisa.v5i1.2269 IDENTIFIKASI POLA DISTRIBUSI STRESS COLOUMB PADA GEMPABUMI 2 AGUSTUS 2019 DI TUGU HILIR, INDONESIA http://ejurnal.undana.ac.id/FISA/article/view/2381 <p><strong>Abstrak</strong></p> <p><em>Penelitian ini bertujuan untuk mengidentifikasi pola distribusi perubahan stress coulomb yang dapat digunakan untuk melihat gempabumi susulan yang terjadi dalam jarak dan dalam rentang waktu yang dekat. Penelitian ini menggunakan data gempabumi yang terjadi pada 2 agustus 2019 </em><em>dengan Mw 6,9 di Tugu Hilir, Indonesia, pada koordinat 104,825 BT dan 7,267 LS dengan kedalaman 52,8 km (USGS) memiliki mekanisme fokus (Strike, dip, rake) adalah (201°, 49°, 54°). Data ini kemudian diolah dengan menggunkan software coulomb 3.3 pada matlab. Dari hasil penelitian didapatkan bahwa gempabumi ini gempabumi ini memiliki peningkatan stress coulomb (≤ 1,0 bar) berarah timurlaut-baratdaya dan merupakan daerah gempabumi susulan terjadi. Sedangkan daerah penurunan stress coulomb (≤ -1,0 bar) berarah barat-laut tenggara.</em></p> <p><strong>Kata kunci<em>:</em></strong><em> gempabumi, perubahan stress coulomb, coulomb3.3, USGS, Tugu Hilir.</em></p> <p><strong>Abstra</strong><strong>ct</strong></p> <p><em>T</em><em>his research aims to Identifed the distribution coulomb stress changed that can be used to seesthe subsequent earthquake that occurs within a short distanceand time span. This research uses earthquake data on 2 August 2019 with Mw 6.9 in Tugu Hilir, Indonesia, at 104.825°E and 7.267°S, with 52.8 km depth (USGS). The focus mechanism (strike, dip, rake) is (201°, 49°, 54°). This data prosessed by using Coulomb 3.3 software in MATLAB. The result found that this main earthquake had an increase coulomb stress changed (≤ 1.0 bar) in the northeast-southwest and was a subsequent earthquake area. Whereas the area of decrese of coulomb stress changed (≤ -1.0 bar) in the northwest-southeast.</em></p> <p><strong><em>&nbsp;</em></strong><strong>Keywords<em>:</em></strong><em> earthquake, coulomb stress changed, coulomb 3.3, USGS, Tugu Hilir</em></p> Umbu Harti Mala Juliany Ningsih Mohamad Bernandus Bernandus Valentinus G. V. Putra ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 61 65 PENGARUH MEDAN MAGNET TERHADAP DIAMETER PERKECAMBAHAN KACANG HIJAU http://ejurnal.undana.ac.id/FISA/article/view/2030 <p><strong>Abstrak </strong></p> <p><em>Penelitian yang dilakukan berjudul “Pengaruh Medan Magnet&nbsp; Terhadap Diameter Perkecambahan Kacang Hijau”. Penelitian ini bertujuan untuk mengetahui pengaruh medan magnet terhadap diameter perkecambahan kacang hijau. Penelitian ini disusun dalam Rancangan Acak Lengkap (RAL) dengan satu faktor, yaitu kuat medan magnet dalam waktu yang sama yang terdiri dari kontrol (0 mT), 5,3 mT, 10,7 mT, 16,1 mT, 21,5 mT. Parameter yang diukur adalah diameter batang kecambah kacang hijau. Data dianalisis ragam dilanjutkan dengan uji DMRT pada taraf α = 5%. Hasil penelitian menunjukkan bahwa pemaparan medan magnet&nbsp; mempengaruhi diameter batang kecambah kacang hijau. Perlakuan yang menyebabkan perkembangan diameter batang terbesar adalah 21,5 mT.</em></p> <p><strong>Kata kunci<em>:</em></strong> <em>kacang hijau, medan magnet, diameter</em></p> <p><strong>Abstra</strong><strong>ct</strong></p> <p><em>The study was conducted entitled "The Effect of Magnetic Fields on the Diameter of Green Bean Germination". This study aims to determine the effect of the magnetic field on the diameter of green bean germination. This research was arranged in a Completely Randomized Design (CRD) with one factor, namely magnetic field strength at the same time consisting of controls (0 mT), 5.3 mT, 10.7 mT, 16.1 mT, 21.5 mT . The parameter measured is the diameter of the green bean sprout stem. Data were analyzed by continued variance with DMRT test at α = 5%. The results showed that exposure to the magnetic field affected the diameter of the green bean sprout stem. The treatment that caused the largest stem diameter development was 21.5 mT.</em></p> <p><strong>Keywords<em>: </em></strong><em>green beans, magnetic field, diameter</em></p> Aditya Vethra Prasetyo ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 66 70 10.35508/fisa.v5i1.2030 STUDI PENGHITUNG PACKING FRACTION MENGGUNAKAN FISIKA CITRA http://ejurnal.undana.ac.id/FISA/article/view/2384 <p><strong>Abstrak</strong></p> <p><em>Packing fraction menunjukkan derajat susunan serat pada suatu benang, yang dihitung berdasarkan perbandingan antara volume serat terhadap volume benang atau lua serat total terhadap luas benang. Pada kondisi panjang serat dan panjang benang memiliki panjang yang sama, maka untuk menghitung volume serat maupun volume benang dapat didekati dengan penghitungan luas permukaan serat total dan luas permukaan benang. Penghitungan rasio luas permukaan serat terhadap luas permukaan benang yang akurat sangatlah sulit didapatkan dikarenakan bentuk permukaan serat yang sembarang dan perhitungan kalkulus matematika yang rumit. Untuk mengatasi masalah tersebut, maka diperlukan suatu metode fisika citra untuk menghitung luasan permukaan serat sembarang. Pada penelitian ini telah didapatkan suatu metode untuk mengukur nilai Packing fraction dengan lebih baik menggunakan metode pengolahan citra untuk mendapatkan luasan acak serat.</em></p> <p><strong>Kata Kunci</strong>: <em>packing fraction; benang; tekstil; image processing</em></p> <p>&nbsp;<strong><em>Abstract</em></strong></p> <p><strong><em>The Study Calculation of Packing fraction using physics of imaging</em></strong><em>. Packing fraction shows the degree of arrangement of fibers in a yarn, which is calculated based on the ratio between the volume of fiber to the volume of yarn or total fiber area to yarn area. In the condition of fiber length and yarn length have the same length, then to calculate </em><em>volume of fiber</em><em> and </em><em>volume of yarn it</em><em> can be approached by calculating the total fiber surface area and yarn surface area. Precise calculation of the fiber surface area to yarn surface area is very difficult to obtain due to the arbitrary shape of the fiber surface and complex mathematical calculation. To overcome this problem, we need an </em><em>image processing</em><em> method to calculate the surface area of any fiber. In this research, a method for measuring the value of Packing fraction has been better obtained using an image processing method to obtain a random area of ​​fiber.</em></p> <p><strong>Keywords: </strong><em>packing fraction; yarn; &nbsp;textile; image processing</em></p> Valentinus G. V. Putra Juliany Ningsih Mohamad ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 71 77 RADIATION MEASUREMENT OF RADIOISOTOPE IN MINERAL DEPOSIT AT SUBDISTRICT OF MIDDLE KUPANG WEST TIMOR ISLAND INDONESIA http://ejurnal.undana.ac.id/FISA/article/view/2388 <p><em>The general objective of this work was investigation of radioisotope distribution and accumulation center in mineral deposit at sub-district of Middle Kupang West Timor Island Indonesia. The purposes of research were: to map of radioisotope distribution in the mineral deposit, to estimate area of radioisotope accumulation center in the mineral deposit, to establish range of nuclear radiation counts in the center region of radioisotope content in mineral deposit. The general methods used in this research were observation, survey, mapping, analysis, and interpretation. Procedures detail of research consists of: observe and identify the potential region and plot gridding, calibrate equipment necessary, measure background count in around of survey location and nuclear radiation in the survey location, plot of three dimensions curve and contour after corrected by background count. Based on geology information or geology data (drilling data) three depth levels determined (about 20 m, 40 m and 60 m), Radiation powers were calculated for estimation of accumulation center of radioisotope in deposit mineral, and contour and three dimensions curves of radiation power of radioisotope in deposit mineral were plotted. Results: Based on three dimensional curves and contour map (radiation counts and radiation powers on three levels) of radioisotope in mineral deposit respectively was distributed on area 3.00 x 106 m2, and 1.56 x 104 m2. The interval of radiation counts of radioisotope in mineral deposit was 10 counts per minute-137 counts per minute.</em></p> <p><strong>Keywords</strong>: <em>Radiation, measurement, radioisotope, mineral, deposit</em></p> Bartholomeus Pasangka Frederika Rambu Ngana ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-sa/4.0 2020-04-15 2020-04-15 5 1 78 86