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Journal of Aceh Physics Society
Published by Universitas Syiah Kuala
ISSN : -     EISSN : 23558229     DOI : -
Core Subject : Science,
Physics
Focus of Journal of Aceh Physics Society (JAcPS) provides a forum for original paper works that enhances understanding of physics and their application. Scope of Journal of Aceh Physics Society (JAcPS) paper related to the development of new experimental methods, visualization techniques, material physics, optic, laser and instrumentation in physics is an important part of this journal. Experience gained and lessons learned in building test facilities and in measuring and reducing test data are important aspect of any experimental work. Authors are encouraged to report this experience and to summarize the original data. Archival review paper, short communication, invited papers, discussion of previously published papers, and book reviews are regular feature of the journal, in addition to full-length article.
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Articles 5 Documents
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Search results for , issue "Volume 8, Number 3, September 2019" : 5 Documents clear
Interpretation of Near Surface Based on the Magnetic Data at Geothermal Area, Jaboi, Sabang Dinni Mahmudi; Muhammad Isa; Didik Sugiyanto
Journal of Aceh Physics Society Volume 8, Number 3, September 2019
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v8i3.14550

Abstract

Telah dilakukan penelitian geofisika menggunakan metode magnetik untuk mendapatkan struktur bawah permukaan di daerah prospek panas bumi Jaboi, Sukajaya, Kota Sabang. Pengukuran medan magnetik total dilakukan pada 40 titik menggunakan Proton Precession Magnetometer (PPM). Daerah Jaboi memiliki sudut inkinasi -4.416 dan deklinasi -0.875 dengan nilai medan magnetik total berkisar antara 41550 hingga 42600 nT. Untuk mendapatkan nilai anomali magnetik dilakukan koreksi diurnal dan koreksi IGRF (International Geomagnetic Reference Field). Setelah koreksi dilakukan diperoleh nilai anomali magnetik daerah panas bumi Jaboi antara -200 nT sampai dengan -950 nT. Selanjutnya hasil anomali magnetik ini digunakan dalam memodelkan struktur bawah permukaan dengan panjang lintasan 1800 m dari Tenggara-Barat Laut. Berdasarkan interpretasi data anomali magnetik menunjukkan daerah penelitian didominasi oleh anomali rendah yang berarti daerah manifestasi panas bumi. Interpretasi anomali tinggi dan rendah menunjukkan adanya patahan yang diduga sebagai patahan Ceuneuhot. Dari hasil pemodelan 2D menggunakan software Mag2DC, menunjukkan bahwa terdapat 5 lapisan dengan kedalaman 0 - 1000 m. Lapisan-lapisan ini adalah soil ( = 0,00 x 10-6 SI), andesit terubah (  = 13,408 x 10-6 SI), breksi tufa terubah (  = 12,686 x 10-6 SI), andesit terubah (  = 13,423 x 10-6 SI) dan breksi andesit (  = 13,535 x 10-6 SI). Melalui pemodelan ini diyakini zona patahan adalah patahan Ceuneuhot. Geophysical reasearch by using magnetic method was done in order to obtain subsurface structure of geothermal prospect area Jaboi, Sukajaya, Sabang City. The measurement of total magnetic field was taken at 40 points using Proton Precession Magnetometer (PPM). Jaboi area has an inklination angle -4.416 and declination angle -0.875 which has total magnetic field range between 41550 to 42600 nT. Diurnal Correction and IGRF (International Geomagnetic Reference Field) correction was used to obtain magnetic anomalies. The values of magnetic anomalies in Jaboi Geothermal Area is -200 to -950 nT. The result of magnetic anomalies was used to modelled the subsurface structure with profile distance is about 1800 m from Southeast to Northwest. Based on the magnetic anomalies data, the reaserch area dominated by low anomalies that indicated geothermal manifestation area. High and low magnetic anomalies indicated a fault that estimated as Ceuneuhot fault. From the result of 2D modelling using software Mag2DC, showed that the research area consist of 5 subsurface structure from 0 – 1000 m depth. The layers are soil (  = 0.00 × 10-6 SI), altered andesite (  = 13.408 × 10-6 SI), altered breccia-tuff (  = 12.686 × 10-6 SI), altered andesite (  = 13.423 × 10-6 SI), and breccia-andesite (  = 13.535 × 10-6 SI). Also from the model was  obtained the Ceuneuhot fault zone.  Keywords: Magnetik, Anomali Magnetik, Struktur Bawah Permukaan, Panas Bumi
NDVI Based Analysis on the Impact of 2004 Tsunami Disaster Recovery Toward Vegetation Condition in Banda Aceh Zinatul Hayati; Saumi Syahreza; M Syukri Surbakti
Journal of Aceh Physics Society Volume 8, Number 3, September 2019
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v8i3.12688

Abstract

Perubahan tutupan lahan banyak terdapat di kota-kota yang sedang berkembang. Banda Aceh, Indonesia merupakan salah satu provinsi yang sudah mengalami peningkatan jumlah penduduk dan percepatan pembangunan. Pasca bencana gempa dan tsunami 2004 perubahan penggunaan dan tutupan lahan (land use and land cover change/LULC) terlihat semakin meluas, dan hal ini berdampak pada berkurangnya lahan vegetatif. Artikel ini menjelaskan cara menganalisis NDVI dengan mengunakan data citra satelit Landsat 5 dan 8 untuk mengetahui kerapatan vegetasi di wilayah Banda Aceh dengan 9 kecamatan yang diambil tahun 2004, 2009, dan 2017. Studi ini mengidentifikasi antara pola perubahan tutupan lahan dan menyelidiki dampak tsunami, sehingga banyak kehilangan vegetasi pada lingkungan tersebut. Penelitian ini menggunakan Sistem Informasi Geografis (GIS) dimana tahap awal adalah mengumpulkan data citra satelit. Pada tahap kedua dilakukan pengolahan data menggunakan software PCI Geomatika 2016. Hasil analisa citra menjelaskan tahun 2004, 2009 dan 2017  kawasan kehijauan, masih banyak terdapat di kecamatan Lueng Bata, Ulee Kareng dan Banda Raya. Changes in land cover are often found in developing cities. Banda Aceh is one of the provinces in Indonesia that experiences an increase in the population and accelerated development. Land use and land cover (LULC) have increased dramatically since the 2004 earthquake and tsunami disaster and continued to reduce the vegetative land. This article explains how to analyze NDVI using Landsat 5 and 8 of the satellite image data. It aims to determine the vegetation density of Banda Aceh in 9 sub-districts taken in 2004, 2009 and 2017. This study identified patterns of changes in land cover and investigated the impact of the tsunami on the vegetational loss of the environment. Geographic Information System (GIS) was used in the study in which the satellite image data were collected before they were processed in the PCI Geomatika 2016 software. The results indicate that in the years of 2004, 2009 and 2017, many green areas are present in Lueng Bata, Ulee Kareng and Banda Raya sub-district. Keywords: Remote Sensing, Landsat Imagery, and NDVI
Ripeness Classification of Oil Palm Fresh Fruit Bunch Using an Optical Probe Nurmaya Sari; Minarni Shiddiq; Ramma Hayu Fitra; Nadia Zakyyah Yasmin
Journal of Aceh Physics Society Volume 8, Number 3, September 2019
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v8i3.14122

Abstract

Penggunaan spektroskopi fluoresensi yang nondestruktif bidang pertanian semakin intensif dilakukan khususnya untuk evaluasi produk pertanian. Sortasi dan grading Tandan Buah Segar (TBS) Kelapa Sawit sebelum memasuki proses produksi Crude Palm Oil sangat penting untuk memenuhi standar produksi dan ekspor. Sistem sortasi dan grading elektronik dibutuhkan untuk mengantikan metode sortasi manual mengandalkan penglihatan dan pengalaman. Pada penelitian ini probe optik yang terdiri dari laser dioda 640 nm dan dua fotodioda inframerah dalam konfigurasi triangulasi digunakan untuk mengevaluasi tingkat kematangan TBS kelapa sawit dan hubungannya dengan kekerasan buah dan tegangan fotodioda. Sampel terdiri dari 23 TBS Tenera. Buah kelapa sawit pada setiap TBS disinari laser pada tiga bagian yaitu pangkal, tengah dan ujung, setiap bagian terdiri dari tiga buah kelapa sawit. Tegangan keluaran dari kedua fotodioda dijumlahkan dan diperkuat oleh rangkaian multiboard komersial. Setelah tegangan diperoleh, ke-9 buah kelapa sawit dilepaskan dari TBS, tingkat kekerasan buah diukur mengunakan penetrometer. Hasil penelitian menunjukkan bahwa tingkat kematangan TBS mempunyai korelasi linier terhadap kekerasan buah dengan kekerasan yang tertinggi pada buah mentah sebesar 9,39 kg/cm2 dan terendah pada buah terlalu matang sebesar 5,64 kg/cm2. Nilai tegangan rata-rata terkecil pada buah mentah dan tertinggi pada buah matang kemudian turun pada buah lewat matang. Hasil K-means clustering menunjukkan pengelompokan 4 tingkat kematangan berdasarkan nilai kekerasan dan tegangan yaitu F0, F1, F2, dan F3. Applications of nondestructive fluorescence spectroscopy in agriculture have been intensively carried out especially to evaluate agriculture products. Sorting and grading oil palm fresh fruit bunches (FFB) before Crude Palm Oil milling processes are important tasks to meet the production and export standards. Electronic systems for sorting and grading of FFBs are needed to replace manual sorting method which depends on human vision and experience. In this study, an optical probe consisted of a 635 nm diode laser and two photodiodes was used to evaluate the ripeness level of oil palm FFB and its relation to both the fruitlet firmness and resulted photodiode voltages. Laser was directed to each of nine fruitlets of each FFB from three parts; basil, equatorial, and apical. Output voltages from each photodiode were summed and amplified by a commercially multi-board circuit. Then their firmness levels were obtained using a penetrometer. The results show that there is a linear correlation between the firmness levels and the FFB ripeness levels. The firmness values ranges from 9.39 kg/cm2 for unripe FFB and 5.64 kg/cm2 for overripe FFB. The highest voltage is obtained for ripe FFB and less for unripe and overripe FFB. K-means clustering results indicate that the overall ripeness levels are grouped into 4 levels of ripeness, namely F0, F1, F2 and F3 based on the values of hardness and the voltage of each sample.               Keywords: Fluorescence Spectroscopy, Oil Palm, Fresh Fruit Bunch, Firmness, Optical Probe
Identification of Aquifer Layer Based on 2D Resistivity Data in Lhokseumawe Aceh-Indonesia zul Fadhli; Muhammad Syukri; Marwan Marwan
Journal of Aceh Physics Society Volume 8, Number 3, September 2019
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v8i3.14518

Abstract

Penelitian untuk mengidentifikasi keberadaan air tanah dan kedalaman akuifer telah dilakukan di wilayah KEK Arun Lhokseumawe Provinsi Aceh dengan kondisi geologi daerah penelitian adalah batuan lanauan dan batuan lempung serta geomorfologinya berupa perkebunan dan sungai buatan. Penelitian ini mengaplikasikan metode geolistrik resistivitas 2D dengan konfigurasi Wenner-Schlumberger. Akuisisi data di lapangan menggunakan alat SuperSting R8 yang keseluruhannya mempunyai 4 lintasan pengukuran dengan lintasan 1 dan 2 memotong lintasan 3 dan 4, panjang masing-masing lintasan pengukuran tersebut adalah 400 m. Pemprosesan data Hasil akuisisi di lapangan menggunakan software Res2dinv untuk menampilkan model 2D bawah permukaan di lokasi penelitian. Hasil interpretasi menunjukkan lintasan L1 pada kedalaman sampai dengan 70 m terdapat lempung berpasir, lanauan dan gravel. Terdapatnya pengaruh instrusi air laut pada kedalaman 25 m yang ditandai dengan nilai resistivitas 1 Ώm. Lapisan akuifer di identifikasi pada jarak bentangan 100 - 200 m dan pada kedalaman 60 m dengan nilai resistivitas 30 Ωm. Penampang lintasan 3 dan 4 tidak menunjukkan adanya lapisan akuifer yang layak untuk diexploitasi pada lintasan tersebut. Interpretasi lintasan L4 menunjukkan adanya intrusi air laut yang besar pada lapisan pertama. Terdapat 3 lapisan yang kontras yaitu lapisan lempung berpasir, gravel/lempung lanauan dan batuan dasar. Lapisan akuifer pada lintasan 4 diinterpretasikan berada pada kedalaman 70 m dengan nilai resistivitas 30 Ωm. Rekomendasi yang paling layak untuk lokasi pengeboran yaitu pada lintasan 4 pada jarak bentangan 180 m dengan jenis akuifer tertekan. The research to identified ground water and depth of aquifer was conducted in KEK Arun Lhokseumawe Aceh Province. The geology contained siltstone and clay with geomorphology area are plantation and artificial river. The 2D resistivity acquisition was using Supersting R8 equipment with Wenner-Schlumberger array. There are 4 survey lines that conducted in the area where line 1 and 2 were crossed with line 3 and 4. The length of each line is 400 m respectively. The data processing was using Res2dinv software to shows 2D subsurface model. The result shown that line 1 is sandy clay, siltstone and gravel at depths up to 70 m. It was influenced by sea water at depth 25 m with resistivity value of 1 Ωm. The aquifer layer was identified at depth 60 m with resistivity value of 30 Ωm. However, line 3 and 4 were presented that the area surveys are suitable for exploration which have not indicate the existence of an aquifer layer. In the last line, it shown sea water intrusion at the first layer. There are 3 layers that contained in line 4 which is clayey sand, gravel and bedrock. The aquifer layer at Line 4 was interpreted at depth 70 m with resistivity value of 30 Ωm. The most feasible recommendation for a drilling location is on Line L4 at a distance of 180 m with a confined aquifer type. Keywords: Aquifer, Resistivity, Lhokseumawe, ground water, sand
Ripeness Level Classification of Oil Palm Fresh Fruit Bunch Using Laser Induced Fluorescence Imaging Hefniati Ishak; Minarni Shiddiq; Ramma Hayu Fitra; Nadia Zakyyah Yasmin
Journal of Aceh Physics Society Volume 8, Number 3, September 2019
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v8i3.14139

Abstract

Tingkat Kematangan Tandan Buah Segar (TBS) kelapa Sawit merupakan faktor penentu kualitas crude palm oil (CPO) yang dihasilkan pabrik kelapa sawit. Metode penyortiran TBS setelah panen atau sebelum memasuki proses perebusan pada umumnya dilakukan secara manual mengandalkan penglihatan dan pengalaman. Metode ini rentan kesalahan dan bersifat subyektif. Metode pencitraan berkembang sangat cepat karena kemajuan dalam bidang komputer dan teknik pengolahan citra, khususnya untuk sistem sortasi dan grading. Penelitian ini mengunakan metode pencitraan fluoresensi yang diinduksi laser untuk mengakses dan mengklasifikasi tingkat kematangan TBS kelapa sawit. Hubungan antara tingkat keabuan dan tingkat kekerasan buah TBS dianalisa. Sampel terdiri dari 27 TBS kelapa sawit varietas Tenera. Tingkat kematangan dikategorikan oleh pemanen berpengalaman menjadi mentah, matang, dan lewat matang. Tiga bagian TBS yaitu pangkal, tengah, dan ujung disinari laser dioda 640 nm mengenai 5 buah pada tiap bagian. Kemudian citra direkam mengunakan kamera CMOS monokrom. Selanjutnya 15 buah tersebut diuji tingkat kekerasan mengunakan penetrometer. Klasifikasi tingkat kematangan dilakukan mengunakan K-mean clustering. Hasil penelitian memperlihatkan bahwa metode pencitraan fluoresensi yang diinduksi laser potensial digunakan dalam mengklasifikasi tingkat kematangan TBS. Tingkat kekerasan buah berkorelasi positif terhadap tingkat keabuan citra TBS. K-mean clustering memperlihatkan tiga kelompok tingkat kematangan yang terdiri dari 0, 1 dan 2. Ripeness levels of oil palm fresh fruit bunches (FFB) are the main factor to determine the quality of crude palm oil (CPO) produced by Oil Palm Mill. Sorting oil palm FFB after harvest or before entering the boiling process is generally done manually which relies on human vision and experience. Imaging methods has developed vastly due to advances in computer and image processing techniques. This study used a laser-induced fluorescence imaging to access and classify the ripeness levels of oil palm FFB of Tenera variety. The relationship between gray value and the level of firmness of FFB fruit was analyzed. The samples consisted of 27 oil palm FFB categorized  by experienced harvester as unripe, ripe, and overripe. Laser light was shone on equatorial part of each FFB such that 5 fruitlets were covered by laser light, then the image of the front part was acquire using a monochrome CMOS camera. The step was repeated for basil and apical parts in sequent. All 15 fruitlets were testing for the firmness level using a penetrometer. Ripeness level classification was done using K-mean clustering. The results showed that the laser-induced fluorescence imaging method are potential to be used to determine the ripeness levels of FFB. The fruit firmness is positively correlated with the gray value of the image of FFB. K-mean clustering shows three ripeness centroid of 0, 1 and 2 . Keyword: Fluorecence Imaging, Oil Palm, Fresh Fruit Bunches, Firmness, Laser Induced Fluorecence

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