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All Journal Teknosains: Media Informasi Sains dan Teknologi Jurnal Fisika dan Terapannya
Sahara Sahara
Universitas Islam Negeri Alauddin Makassar
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Physics

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PENGEMBANGAN KOMPOSIT PANEL AKUSTIK BERBAHAN DASAR BIJI DAN KULIT KAPUK RANDU UNTUK MENINGKATKAN KOEFISIEN ABSORBSI BAHAN Sahara Sahara; Amirin Kusmiran
Teknosains Vol 15 No 2 (2021): Mei-Agustus
Publisher : Fakultas Sains dan Teknologi Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/teknosains.v15i2.20176

Abstract

Cangkang dan biji Ceiba pentandra berpotensi menjadi sampah organik jika sampah tersebut tidak dikelola dengan baik. Dampak negatif dari cangkang dan biji Ceiba pentandra merugikan lingkungan yaitu pencemaran air dan udara. Masalah ini dapat diatasi dengan mengolah sampah menjadi material yang bernilai ekonomis yaitu panel akustik dari material alam. Selain itu, penggunaan panel akustik untuk mengurangi polusi udara dari gelombang suara. Pembuatan bahan baku tersebut dilakukan dengan teknik hand lay-up dengan menggunakan polimer poliester sebagai matriks dan cangkang dan biji sebagai serat. Bahan baku pabrikan telah dikeringkan selama 10 jam untuk mendapatkan pemadatan panel akustik yang optimal. Untuk mengetahui koefisien absorpsi panel akustik dilakukan pengukuran kebisingan dari panel akustik berbahan cangkang, biji kasar dan halus Ceiba pentandra, baik tanpa aluminium foil maupun dengan aluminium foil. Pengaruh jarak terhadap penyerapan suara dari berbagai sampel juga dilakukan. Hasil penelitian menunjukkan bahwa koefisien serap tertinggi pada sampel dengan biji Ceiba petandra adalah 0,356 dengan aluminium foil sedangkan tanpa aluminium foil adalah 0,255, koefisien serap tertinggi pada sampel dengan kulit Ceiba pentandra adalah 0,435 dengan aluminium foil sedangkan tanpa aluminium foil adalah 0,35. dan koefisien serap tertinggi pada sampel dengan biji Ceiba pentandra adalah 0,427 dengan aluminium foil sedangkan tanpa aluminium foil adalah 0,272. Dengan demikian, penambahan aluminium foil dapat meningkatkan koefisien penyerapan panel akustik.
PENGARUH VARIASI KETEBALAN DAN NILAI KOEFISIEN ABSORBSI UNTUK CACAHAN HALUS DAN CACAHAN KASAR PAPAN AKUSTIK DARI BATANG KELOR (MORINGA OLEIFERA LAM) Fitria Jasman; Sahara Sahara; Muh Said L; Hernawati Hernawati
JFT : Jurnal Fisika dan Terapannya Vol 8 No 2 (2021): DESEMBER
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v8i2.23557

Abstract

This study aims to determine the effect of thickness on the absorption coefficient of the acoustic board made from Moringa stems (Moringa Oleifer Lam). The method used in this research is to make an acoustic board with two types of samples, namely finely chopped samples and coarse chopped samples with a thickness of 0.70 cm, 1.00 cm and 1.20 cm, and measuring the absorption coefficient with variations in the thickness of the acoustic board. The frequency values used are 300 Hz, 500 Hz, 750 Hz, 900 Hz, 1000 Hz and 3000 Hz. Based on the results of the study, it was found that the sound absorption coefficient of acoustic material with variations in thickness indicated that the finely chopped and coarsely chopped samples had an effect on increasing the thickness of a sample, where the thicker the sample, the lower the absorption coefficient value. That meets ISO standards sound absorption coefficient value for fine pieces is at a frequency of 500 Hz with an absorption coefficient of 0.35, 0.30, and 0, 019, for 500 Hz with absorption coefficients 0.34, 0.27, and 0.30 while for 900 Hz the absorption coefficient values are 0.32, 0.24, and 0.20.
ANALISIS PEMETAAN ZONA KONSERVASI AIR TANAH DI PROVINSI SULAWESI SELATAN MENGGUNAKAN APLIKASI QGIS Abu Ammar; Askar; Abd. Munir HB; Sahara
JFT : Jurnal Fisika dan Terapannya Vol 9 No 1 (2022): JUNI
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v9i1.26495

Abstract

This study is titled Mapping Analysis of Groundwater Conservation Zones in South Sulawesi Province Using QGIS Application. This study aims to digitize the map of groundwater conservation zones in 13 regencies/cities in South Sulawesi Province and to find out the division of groundwater conservation zones in 13 regencies / cities in South Sulawesi while calculating the area of each zone. The method used in this study is to use data processing methods, where secondary maps in jpeg form are digitized and then analyzed to obtain results in the form of zone division and area of each zone. From the results of research that has been obtained, there are 5 types of groundwater conservation zones, namely critical zones, rare zones, vulnerable zones, safe zones, and addition zones. In 13 regencies/cities in South Sulawesi Province the most extensive zone is a safe zone with an area of 818912.42 hectares. However, the second largest zone (59626,923 hectares) is a vulnerable zone where in this zone can no longer absorb properly. For this reason, there needs to be a preventive way to overcome the problem.
PENGUJIAN KOEFISIEN ABSORBSI PADA PAPAN AKUSTIK MENGGUNAAN BAHAN DASAR BATANG JAGUNG DENGAN PEREKAT RESIN POLYESTER Ayu Hardianti Mahmud; Ihsan Ihsan; Sahara Sahara
JFT : Jurnal Fisika dan Terapannya Vol 7 No 2 (2020): DESEMBER
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v7i2.13830

Abstract

This study aims to determine the effect of thickness variations on the sound absorption coefficient of acoustic material from corn stalks. The study was conducted by making acoustic board samples from corn stems with Polyester Resin adhesive. In this study the thickness of the acoustic boards used were 0.7 cm, 1 cm, and 1.5 cm. The amount of frequency used is 250 Hz, 500 Hz, 1000 Hz, 2000 Hz. Based on the results of the research, the absorption coefficient value is proportional to the thickness, where the greater the thickness of a material, the lower the coefficient value produced. In the thickest sample with a thickness of 1.5 cm for a frequency of 250 Hz, the absorption coefficient value is 0.177, while at the frequency of 2000 Hz the absorption coefficient value is 0.084.
PENGARUH TEGANGAN TABUNG (kV) PADA PEMERIKSAAN THORAX TERHADAP KUALITAS CITRA RADIOGRAFI DI BALAI BESAR KESEHATAN PARU MASYARAKAT MAKASSAR Fitriani Fitriani; Sri Zelviani; Sahara Sahara
JFT : Jurnal Fisika dan Terapannya Vol 7 No 2 (2020): DESEMBER
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v7i2.18067

Abstract

This study aims to determine the effect of high voltage usage and standards on the quality of radiographic imagery produced on X-ray aircraft. Data retrieval was obtained by conducting testing in the Radiology Installation room of the Makassar Public Lung Health Center by using an X-ray aircraft of thosiba brand type with drx-1824B model unit. The result obtained is the voltage of the tube gives an influence on the quality of radiography imagery where for the use of standard tube voltage provides good radiographic imagery quality results with a graph reading histogram voltage of 50 kV with a distance of 100 cm and a time of 10 mAs with a black background image starting at the position of 16 to 36 and the position of the object is 37 to 79 which is then able to provide information because the edges of the object and background can still be distinguished clearly and for the high voltage used the result is less tub because it can reduce the contrast value of objects and background is indistinguishable, this is seen in the histogram readings voltage of 90 kV and distance of 100 cm and the time of 10 mAs has a gradation of gray color that dominates compared to the black background whose position starts from 10 to 132 which can not provide information on the edge value between the background and the object phantom water because both seem to be fused so that it is indistinguishable and causes an inadequate image contrast Not good enough.
PEMANFAATAN JERAMI DAN BUAH LONTAR SEBAGAI SUBSTRAT MENGGUNAKAN TEKNOLOGI MICROBIAL FUEL CELL Basmanto Basmanto; Hernita Sapitriani; Nurfadhilah jusman; Sahara Sahara; Jasdar Agus
JFT : Jurnal Fisika dan Terapannya Vol 8 No 1 (2021): JUNI
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v8i1.21192

Abstract

The increasing energy consumption is not directly proportional to the availability of energy. This encourages the continued development of alternative energy sources to replace fossil energy sources.  In this research, a Microbial Fuel Cell (MFC) will be made as an alternative energy source that metabolism of bacteria to produce electrical energy.  Microbial Fuel Cell (MFC) is made by varying the type of substrate.  The type of substrate used is made of straw and borassus fruit extract. In this study, the MFC design uses a dual-chamber system consisting of an anode compartment and a cathode compartment. Analysis of the effect of substrate variations on MFC performance can be seen from the measurement data of current and voltage using a digital multimeter based on the length of time working with the addition of resistance and without resistance which is used to determine the power density value. The measurement results showed that the highest power density for straw substrate was obtained at 1st hour measurement, which a value of 770.1 mW/m2 for the addition of external resistance and 401.6 mW/m2 without external resistance.  Meanwhile, for the borassus fruit extract substrate, the highest power density was obtained at 29 hours of 594.1 mW/m2 using external resistance and 364.9 mW/m2 without external resistance. The resulting power density value is higher than previous studies so that the straw and borassus fruit extract substrate has a great potential to be used as a substrate in MFC technology.
Pengaruh Pemberian Gelombang Bunyi Jenis Murottal Terhadap Pertumbuhan Batang Dan Daun Pada Pembibitan Kacang Tanah (Arachis Hypogea) Zulfaniar; Hernawati; Sahara
JFT : Jurnal Fisika dan Terapannya Vol 10 No 1 (2023): JUNI
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v10i1.25502

Abstract

This study aims to determine the effect of murottal type sound waves on stem height, number of leaves and number of stalks on peanut plant growth. Using local peanut seeds with the addition of organic fertilizer, urea fertilizer and without the addition of other nutrients. The peanut seeds were treated with 4000 Hz murottal sound with different exposure times and without murottal sound exposure. Peanut seedlings were observed using a camera to obtain images and using measuring instruments to determine the growth of stems and leaves. The results showed that the difference in the effect of giving sound and without sounding could give a change in the average increase of 6 - 9 cm in stem height, the number of leaves experienced an average increase of 4 leaves while the change in the number of stalks experienced an increase of 1 stalk.
Co-Authors Abd. Munir HB Abu Ammar Amirin Kusmiran Askar Ayu Hardianti Mahmud Basmanto Basmanto Fitria Jasman Fitriani Fitriani Hernawati Hernawati Hernita Sapitriani Ihsan Ihsan Jasdar Agus Muh. Said L Nurfadhilah jusman Zelviani, Sri Zulfaniar