Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.50114
Eddy Mirnanda
South China Sea (SCS) is underlain by sediments of an average density 2.10 g/cm3 of 2 km thickness at its central part up to 10 km in the margins. The basement rock is the upper and lower crust of densities 2.67 and 2.85 g/cm3 respectively of varying thicknesses. The thinnest crustal rock is at the centre of SCS that is called the South China Sea Basin (SCSB). The Mohorovicic discontinuity is about 15 km depth below the SCSB. Heatflow values in this basin vary from 2 to 3.5 HFU.Lineations of total magnetic anomaly are generally in a west-east direction covering the whole study area. However, an elongated northeast-southwest lineation of dipole anomaly separates the west-east anomaly patterns in the north from those in the south. This feature is also observed in the gravity map. These elongated patterns of the total magnetic features are in coincident with the occurrences of seamounts inferred being remnant of extinct seafloor spreading. Because of this spreading a crustal extension had taken place that separated Kalimantan from the mainland of China to restore its present position. A paleomagnetic study result confirms this hypothesis.The Palawan trench is marked by north-east trending magnetic and gravity anomaly that is inferred being traces of a remnant subduction zone. This anomaly forms a boundary between the Zengmu also called the Sarawak basin and the SCSB. Here, heat flow value is 1 to 2 HFU. This value in coincident with gravity gradient of 2.5 mGal/km also represents an active subduction of the Manila trench north of the Palawan Island. The Manila trench is supposed to be the energizing source of volcanism and earthquake in the Phillippines. Free-air and Bouguer anomaly of the order of 50 to 60 mGal and magnetic of about 100 nT represent the Zengmu basin in the Sunda Shelf. This basin is underlain by sediments of 2.10 g/cm3 of 8 km thickness and also crustal rock which is much thicker than the one underneath the SCSB. Strong topographic relief at the surfaces of sedimentary layer and the crustal rock is very my much associated with normal faulting that may cause fluctuation of the free-air values.The continental margins of Sarawak and the Sunda Shelf are areas of hydrocarbon deposits now still in production, whereas the offshores Vietnam and Hainan are promising target for hydrocarbon exploration.
{"title":"Geophysics Appearance of The South China Sea","authors":"Eddy Mirnanda","doi":"10.13057/IJAP.V11I2.50114","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.50114","url":null,"abstract":"South China Sea (SCS) is underlain by sediments of an average density 2.10 g/cm3 of 2 km thickness at its central part up to 10 km in the margins. The basement rock is the upper and lower crust of densities 2.67 and 2.85 g/cm3 respectively of varying thicknesses. The thinnest crustal rock is at the centre of SCS that is called the South China Sea Basin (SCSB). The Mohorovicic discontinuity is about 15 km depth below the SCSB. Heatflow values in this basin vary from 2 to 3.5 HFU.Lineations of total magnetic anomaly are generally in a west-east direction covering the whole study area. However, an elongated northeast-southwest lineation of dipole anomaly separates the west-east anomaly patterns in the north from those in the south. This feature is also observed in the gravity map. These elongated patterns of the total magnetic features are in coincident with the occurrences of seamounts inferred being remnant of extinct seafloor spreading. Because of this spreading a crustal extension had taken place that separated Kalimantan from the mainland of China to restore its present position. A paleomagnetic study result confirms this hypothesis.The Palawan trench is marked by north-east trending magnetic and gravity anomaly that is inferred being traces of a remnant subduction zone. This anomaly forms a boundary between the Zengmu also called the Sarawak basin and the SCSB. Here, heat flow value is 1 to 2 HFU. This value in coincident with gravity gradient of 2.5 mGal/km also represents an active subduction of the Manila trench north of the Palawan Island. The Manila trench is supposed to be the energizing source of volcanism and earthquake in the Phillippines. Free-air and Bouguer anomaly of the order of 50 to 60 mGal and magnetic of about 100 nT represent the Zengmu basin in the Sunda Shelf. This basin is underlain by sediments of 2.10 g/cm3 of 8 km thickness and also crustal rock which is much thicker than the one underneath the SCSB. Strong topographic relief at the surfaces of sedimentary layer and the crustal rock is very my much associated with normal faulting that may cause fluctuation of the free-air values.The continental margins of Sarawak and the Sunda Shelf are areas of hydrocarbon deposits now still in production, whereas the offshores Vietnam and Hainan are promising target for hydrocarbon exploration.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48758094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.45431
Bibit Cahyani, Utari Utari, M. Muhtarom
Research has been carried out to determine the kVp of X-ray aircraft using an imaging plate (IP) as a measuring tool. The imaging plate functions to record images after irradiation and as a detector to capture and store X-ray energy when it penetrates an object. The purpose of this study is to use IP as a kVp measurement tool. The method used is to create a characteristic curve of the relationship between the ratio of Region of Interest (ROI) of two aluminum filters to rated voltage (kVp). From the research obtained the equation y = 2816.61 x2 – 4532.19 x + 1878.65 with R2 = 0.988. The kVp test was carried out using a fluoroscopic X-ray model SM-20HFH. The test results obtained that the measured kVp value at a voltage of 70 kV was 66.21 kV and an error value of 5.41%. While the measured kVp value at 55 kV is 58.95 kV with an error value of -7.18%. These results indicate that IP can be used to measure kVp with an error below the allowable tolerance, namely the max error ≤ of 10%.
{"title":"Penentuan Peak Kilovoltage (kVp) Pesawat Sinar-X Dengan Pemanfaatan Imaging Plate (IP) Di RSUD Dr. Moewardi","authors":"Bibit Cahyani, Utari Utari, M. Muhtarom","doi":"10.13057/IJAP.V11I2.45431","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.45431","url":null,"abstract":"Research has been carried out to determine the kVp of X-ray aircraft using an imaging plate (IP) as a measuring tool. The imaging plate functions to record images after irradiation and as a detector to capture and store X-ray energy when it penetrates an object. The purpose of this study is to use IP as a kVp measurement tool. The method used is to create a characteristic curve of the relationship between the ratio of Region of Interest (ROI) of two aluminum filters to rated voltage (kVp). From the research obtained the equation y = 2816.61 x2 – 4532.19 x + 1878.65 with R2 = 0.988. The kVp test was carried out using a fluoroscopic X-ray model SM-20HFH. The test results obtained that the measured kVp value at a voltage of 70 kV was 66.21 kV and an error value of 5.41%. While the measured kVp value at 55 kV is 58.95 kV with an error value of -7.18%. These results indicate that IP can be used to measure kVp with an error below the allowable tolerance, namely the max error ≤ of 10%.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66127260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.41699
Nanang Sugianto, Refrizon Refrizon
Shear wave velocity (Vs) structure at along of Central Bengkulu-Kepahiang crossline has been mapped. This research aims to identify the subsurface structure and to estimate the constituent material type of rock in landslide-prone areas (Central Bengkulu-Kepahiang crossline). Shear wave velocity structure on each site is obtained by the HVSR-inversion of 146 microtremor data (ambient noise recording of seismometer). Vs structure at the line mapped from the surface until to 30 meters of the depth. Groups of Vs are identified in class E (Vs <180), Class D (180≤ Vs <360), Class C (360≤ Vs <760), and Class B (760≤ Vs <1500). The subsurface structure at the depth of 0 to 10 meters are dominated by stiff soil, very dense soil, and soft rock which has highly fractured and weathered rock properties. At the depth of 15 meters to 30 meters, the subsurface structure is dominated by hard rock but it is high potential or easy to fracturing and weathering like the properties of the rocks in areas that have landslides in the past. Based on Vs value, rock constituent materials are deposition of sand, clay, gravel and alluvium ranging from soft to relatively hard structures at the depth.
绘制了明古鲁—柯帕香中线沿线剪切波速结构图。本研究旨在确定滑坡易发地区（明古鲁-克帕乡中线）的地下结构，并估计岩石的组成材料类型。对146个微地震资料（地震仪环境噪声记录）进行HVSR反演，得到了各场地的剪切波速结构。Vs结构在从地表映射到30米深的线上。Vs组被确定为E级（Vs Vs VsVs值，岩石组成材料是沙子、粘土、砾石和冲积层的沉积，深度从软到相对硬的结构。
{"title":"Struktur Kecepatan Gelombang Geser (Vs) di Daerah Rawan Gerakan Tanah (Longsor) Jalan Lintas Kabupaten Bengkulu Tengah-Kepahiang","authors":"Nanang Sugianto, Refrizon Refrizon","doi":"10.13057/IJAP.V11I2.41699","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.41699","url":null,"abstract":"Shear wave velocity <em>(V<sub>s</sub>)</em> structure at along of Central Bengkulu-Kepahiang crossline has been mapped. This research aims to identify the subsurface structure and to estimate the constituent material type of rock in landslide-prone areas (Central Bengkulu-Kepahiang crossline). Shear wave velocity structure on each site is obtained by the HVSR-inversion of 146 microtremor data (ambient noise recording of seismometer). <em>V<sub>s</sub></em> structure at the line mapped from the surface until to 30 meters of the depth. Groups of Vs are identified in class E (<em>V<sub>s</sub></em> <180), Class D (180≤<em> V<sub>s</sub></em> <360), Class C (360≤<em> V<sub>s</sub></em> <760), and Class B (760≤<em> V<sub>s</sub></em> <1500). The subsurface structure at the depth of 0 to 10 meters are dominated by stiff soil, very dense soil, and soft rock which has highly fractured and weathered rock properties. At the depth of 15 meters to 30 meters, the subsurface structure is dominated by hard rock but it is high potential or easy to fracturing and weathering like the properties of the rocks in areas that have landslides in the past. Based on <em>V<sub>s</sub></em> value, rock constituent materials are deposition of sand, clay, gravel and alluvium ranging from soft to relatively hard structures at the depth.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41569406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.49914
A. Lubis, Yosi Apriani Putri, R. Saputra, Juhendi Sinaga, M. Hasanudin, Edi Kusmanto
The Serangai area, Batik Nau District, North Bengkulu has the highest average abrasion speed of 20 m/year. The abrasion could cause the coastal area to erode the coastline till several tens of meters. The purpose of this study was to determine the height of the ocean waves and to determine the energy of the ocean waves that has the potential to accelerate the abrasion process in the Serangai area. The research was carried out on November 5-7, 2018 in the Serangai beach area at a depth of 5 m using SBE 26 Plus Seagauge Wave equipment. The results showed that the observed wave height was between 0.8-1.6 m with a significant wave height (Hs) of 1.38 m. In addition, the wave period ranges from 5-11 s with a significant wave period (Ts) of 8.2 s. The result also shows that the maximum wave height of 1.6 m occurred on November 7, 2018 with maximum wave energy of 1800 J/m2. This result can perhaps accelerate the abrasion process in the Serangai area. It can also be seen that the wave height in the Serangai region is higher than in several other areas in Indonesia. However, it is necessary to continue observing the wave height to see the seasonal variations in sea wave height in Serangai area.
北Bengkulu Batik Nau区的Serangai地区的平均磨损速度最高，为20 m/年。这种磨蚀会使沿海地区侵蚀海岸线达几十米。这项研究的目的是确定海浪的高度，并确定海浪的能量，这有可能加速Serangai地区的磨损过程。该研究于2018年11月5日至7日在Serangai海滩区域进行，深度为5米，使用SBE 26 Plus Seagauge波浪设备。结果表明:观测波高在0.8 ~ 1.6 m之间，其中显著波高(Hs)为1.38 m;波周期在5 ~ 11 s之间，其中显著波周期Ts为8.2 s。结果还表明，2018年11月7日最大波高为1.6 m，最大波能为1800 J/m2。这一结果可能会加速Serangai地区的磨损过程。还可以看出，雪兰盖地区的浪高高于印度尼西亚其他几个地区。但是，为了了解雪兰盖地区海浪高度的季节变化，有必要继续观测海浪高度。
{"title":"Kajian Energi Gelombang Laut Di Daerah Abrasi Serangai, Bengkulu Utara Melalui Pengamatan Tinggi Gelombang Laut","authors":"A. Lubis, Yosi Apriani Putri, R. Saputra, Juhendi Sinaga, M. Hasanudin, Edi Kusmanto","doi":"10.13057/IJAP.V11I2.49914","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.49914","url":null,"abstract":"The Serangai area, Batik Nau District, North Bengkulu has the highest average abrasion speed of 20 m/year. The abrasion could cause the coastal area to erode the coastline till several tens of meters. The purpose of this study was to determine the height of the ocean waves and to determine the energy of the ocean waves that has the potential to accelerate the abrasion process in the Serangai area. The research was carried out on November 5-7, 2018 in the Serangai beach area at a depth of 5 m using SBE 26 Plus Seagauge Wave equipment. The results showed that the observed wave height was between 0.8-1.6 m with a significant wave height (Hs) of 1.38 m. In addition, the wave period ranges from 5-11 s with a significant wave period (Ts) of 8.2 s. The result also shows that the maximum wave height of 1.6 m occurred on November 7, 2018 with maximum wave energy of 1800 J/m2. This result can perhaps accelerate the abrasion process in the Serangai area. It can also be seen that the wave height in the Serangai region is higher than in several other areas in Indonesia. However, it is necessary to continue observing the wave height to see the seasonal variations in sea wave height in Serangai area.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41544318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.52753
S. Ristanto, C. Huda, Affandi Faisal Kurniawan
Telah dilakukan penelitian tentang pengukuran indeks ultraviolet (UV) matahari dan atenuasinya oleh beberapa bahan. Penelitian ini dilatarbelakangi oleh kebutuhan berjemur di tengah terik matahari sebagai upaya meningkatkan imun tubuh ditengah Pandemi Covid-19. Indeks ultraviolet menjadi kunci dalam menentukan waktu yang tepat. Penelitian ini bertujuan memperoleh data distribusi indeks UV di suatu wilayah beserta atenuasinya untuk keperluan rekomendasi rentang waktu aman berjemur. Alat ukur yang digunakan berupa sensor indeks UV analog yang mengubah radiasi UV menjadi tegangan analog pada rentang 0 – 1 V. Nilai output dibaca menggunakan multimeter lalu dikonversi ke dalam UV indeks menggunakan tabel konversi bawaan produk. Pengukuran UV indeks dibagi menjadi tiga kondisi, pertama berdasarkan rentang waktu pada rentang waktu dari pukul 08.00 – 16.00 WIB, pengaruh tutupan awan, dan pengukuran UV indeks saat melawati beberapa bahan: kacamata transparan, kacamata riben, plastic kemasan, topi, dan kaos olahraga. Hasil penelitian menunjukkan distribusi indek UV berdasarkan rentang waktu berhasil diperoleh, tutupan awan menyebabkan penurunan indek UV sebesar 4 tingkat dan atenuasi Indek UV oleh beberapa bahan berhasil diperoleh. Berdasarkan sampel pengambilan data di Tinjomoyo Banyumanik Kota Semarang diperoleh waktu aman berjemur berada pada rentang sebelum Pukul 10.00 WIB dan setelah Pukul 14.00 WIB.
{"title":"Pengukuran Indeks Ultraviolet Matahari dan Atenuasinya oleh Beberapa Bahan untuk Rekomendasi Waktu Aman Berjemur","authors":"S. Ristanto, C. Huda, Affandi Faisal Kurniawan","doi":"10.13057/IJAP.V11I2.52753","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.52753","url":null,"abstract":"Telah dilakukan penelitian tentang pengukuran indeks ultraviolet (UV) matahari dan atenuasinya oleh beberapa bahan. Penelitian ini dilatarbelakangi oleh kebutuhan berjemur di tengah terik matahari sebagai upaya meningkatkan imun tubuh ditengah Pandemi Covid-19. Indeks ultraviolet menjadi kunci dalam menentukan waktu yang tepat. Penelitian ini bertujuan memperoleh data distribusi indeks UV di suatu wilayah beserta atenuasinya untuk keperluan rekomendasi rentang waktu aman berjemur. Alat ukur yang digunakan berupa sensor indeks UV analog yang mengubah radiasi UV menjadi tegangan analog pada rentang 0 – 1 V. Nilai output dibaca menggunakan multimeter lalu dikonversi ke dalam UV indeks menggunakan tabel konversi bawaan produk. Pengukuran UV indeks dibagi menjadi tiga kondisi, pertama berdasarkan rentang waktu pada rentang waktu dari pukul 08.00 – 16.00 WIB, pengaruh tutupan awan, dan pengukuran UV indeks saat melawati beberapa bahan: kacamata transparan, kacamata riben, plastic kemasan, topi, dan kaos olahraga. Hasil penelitian menunjukkan distribusi indek UV berdasarkan rentang waktu berhasil diperoleh, tutupan awan menyebabkan penurunan indek UV sebesar 4 tingkat dan atenuasi Indek UV oleh beberapa bahan berhasil diperoleh. Berdasarkan sampel pengambilan data di Tinjomoyo Banyumanik Kota Semarang diperoleh waktu aman berjemur berada pada rentang sebelum Pukul 10.00 WIB dan setelah Pukul 14.00 WIB.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47114596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.47345
Maxwell Obia Kanu, G. W. Joseph, Israel George
The ability of the soil to regulate heat energy is important for plant growth, soil texture and strength. Many agricultural soils are acidic in nature which tends to limit plant growth and microbial activity. Aside from agricultural lime, wood ash is used to amend physical and physicochemical properties of the soil. To maintain the soil hydraulic and physicochemical properties and to increase plant yield, it is important to know the physicochemical and physical properties of the ash used. The physiochemical and physical properties vary across various plant species. Ash samples from seven different plants were used for this study. The Horiba metre was used to measure the electrical conductivity, pH, Total Dissolved Solid (TDS) and salinity of the samples, while the Lees Disc apparatus was used to measure the thermal conductivity of the samples. The study revealed that moringa olieferra ash has the highest salinity, TDS and Electrical conductivity, while azadichta indica and tiobroma cacoa have least pH. Also, Kyah seleelygalisis and azadichta indica had the highest and lowest thermal conductivity respectively.
{"title":"Measurement of Physicochemical Properties, Electrical and Thermal Conductivity of Wood Ash for Effective Soil Amendment","authors":"Maxwell Obia Kanu, G. W. Joseph, Israel George","doi":"10.13057/IJAP.V11I2.47345","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.47345","url":null,"abstract":"The ability of the soil to regulate heat energy is important for plant growth, soil texture and strength. Many agricultural soils are acidic in nature which tends to limit plant growth and microbial activity. Aside from agricultural lime, wood ash is used to amend physical and physicochemical properties of the soil. To maintain the soil hydraulic and physicochemical properties and to increase plant yield, it is important to know the physicochemical and physical properties of the ash used. The physiochemical and physical properties vary across various plant species. Ash samples from seven different plants were used for this study. The Horiba metre was used to measure the electrical conductivity, pH, Total Dissolved Solid (TDS) and salinity of the samples, while the Lees Disc apparatus was used to measure the thermal conductivity of the samples. The study revealed that moringa olieferra ash has the highest salinity, TDS and Electrical conductivity, while azadichta indica and tiobroma cacoa have least pH. Also, Kyah seleelygalisis and azadichta indica had the highest and lowest thermal conductivity respectively.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45411651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.44607
Achmad Sasmito, Alfan S. Praja, Linda F. Muzayanah, Rahayu Sapta sri Sudewi
Suhu udara dingin terjadi di dataran tinggi Dieng dan Lumajang pada akhir Juli hingga Agustus 2020. Pada saat yang hampir bersamaan, suhu udara panas terjadi pula di Amerika Serikat, Jepang, dan Spanyol. Penelitian ini membahas pengaruh deklinasi matahari terhadap parameter cuaca di Malang dan sekitarnya. Selain itu, dibahas juga tinjauan fisis dan dinamis terjadinya suhu udara panas di Bumi bagian utara (BBU) dengan suhu udara dingin di bumi bagian selatan (BBS). Data yang digunakan yaitu data numerik radiasi matahari di atmosfer dan data observasi dari AWS yang meliputi unsur radiasi global, suhu, dan kelembapan udara permukaan. Sampel data diambil dari stasiun Klimatologi Malang dan Stasiun Geofisika Karang Kates yang mewakili BBS dan informasi cuaca dari BBU. Estimasi suhu dingin di Ranu Pani, Lumajang dilakukan dengan menggunakan model lapserate. Suhu dingin yang terjadi di wilayah jawa timur dipengaruhi oleh deklinasi matahari, radiasi matahari, koefisien transmisivitas dan proses adveksi suhu dari Australia. Saat matahari berada di utara, terjadi suhu dingin di bumi bagian selatan dan sebaliknya. Terjadinya suhu panas atau dingin di setiap wilayah dipengaruhi juga oleh komposisi gas di atmosfer, geografi, topografi, dan pengaruh adveksi karena pengaruh udara di sekitarnya.
{"title":"Pengaruh Deklinasi Matahari terhadap parameter cuaca wilayah malang dan sekitarnya","authors":"Achmad Sasmito, Alfan S. Praja, Linda F. Muzayanah, Rahayu Sapta sri Sudewi","doi":"10.13057/IJAP.V11I2.44607","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.44607","url":null,"abstract":"Suhu udara dingin terjadi di dataran tinggi Dieng dan Lumajang pada akhir Juli hingga Agustus 2020. Pada saat yang hampir bersamaan, suhu udara panas terjadi pula di Amerika Serikat, Jepang, dan Spanyol. Penelitian ini membahas pengaruh deklinasi matahari terhadap parameter cuaca di Malang dan sekitarnya. Selain itu, dibahas juga tinjauan fisis dan dinamis terjadinya suhu udara panas di Bumi bagian utara (BBU) dengan suhu udara dingin di bumi bagian selatan (BBS). Data yang digunakan yaitu data numerik radiasi matahari di atmosfer dan data observasi dari AWS yang meliputi unsur radiasi global, suhu, dan kelembapan udara permukaan. Sampel data diambil dari stasiun Klimatologi Malang dan Stasiun Geofisika Karang Kates yang mewakili BBS dan informasi cuaca dari BBU. Estimasi suhu dingin di Ranu Pani, Lumajang dilakukan dengan menggunakan model lapserate. Suhu dingin yang terjadi di wilayah jawa timur dipengaruhi oleh deklinasi matahari, radiasi matahari, koefisien transmisivitas dan proses adveksi suhu dari Australia. Saat matahari berada di utara, terjadi suhu dingin di bumi bagian selatan dan sebaliknya. Terjadinya suhu panas atau dingin di setiap wilayah dipengaruhi juga oleh komposisi gas di atmosfer, geografi, topografi, dan pengaruh adveksi karena pengaruh udara di sekitarnya.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45136979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.53213
M. Yunianto, Soeparmi Soeparmi, C. Cari, Fuad Anwar, Delta Nur Septianingsih, T. Ardyanto, Resta Farits Pradana
Telah berhasil dilakukan klasifikasi kanker paru-paru dari 120 data citra CT Scan. Pada penelitian, proses preposisi dimulai dengan variasi filtering yaitu low pass filter, median filter, dan high pass filter. Segmentasi yang digunakan yaitu Otsu Thresholding yang kemudian teksturnya akan diekstraksi menggunakan fitur Gray Level Co-occurrence Matrix (GLCM) dengan variasi arah sudut. Hasil dari ekstraksi GLCM dijadikan database yang akan menjadi dataset untuk pengklasifikasian citra menggunakan klasifikasi naïve bayes. Hasil dari penelitian dengan 12 buah variasi diperoleh hasil variasi terbaik adalah median filter dengan arah sudut GLCM 0° menunjukkan tingkat akurasi yang paling tinggi sebesar 88,33 %.
{"title":"Klasifikasi Kanker Paru Paru menggunakan Naïve Bayes dengan Variasi Filter dan Ekstraksi Ciri GLCM","authors":"M. Yunianto, Soeparmi Soeparmi, C. Cari, Fuad Anwar, Delta Nur Septianingsih, T. Ardyanto, Resta Farits Pradana","doi":"10.13057/IJAP.V11I2.53213","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.53213","url":null,"abstract":"Telah berhasil dilakukan klasifikasi kanker paru-paru dari 120 data citra CT Scan. Pada penelitian, proses preposisi dimulai dengan variasi filtering yaitu low pass filter, median filter, dan high pass filter. Segmentasi yang digunakan yaitu Otsu Thresholding yang kemudian teksturnya akan diekstraksi menggunakan fitur Gray Level Co-occurrence Matrix (GLCM) dengan variasi arah sudut. Hasil dari ekstraksi GLCM dijadikan database yang akan menjadi dataset untuk pengklasifikasian citra menggunakan klasifikasi naïve bayes. Hasil dari penelitian dengan 12 buah variasi diperoleh hasil variasi terbaik adalah median filter dengan arah sudut GLCM 0° menunjukkan tingkat akurasi yang paling tinggi sebesar 88,33 %.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41372403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.45984
Uswatun Chasanah, Eko Handoyo
Distribusi spasial dan temporal dari parameter seismisitas yang terdiri dari magnitude of completeness (Mc), a-value, dan b-value telah dihitung sebagai upaya untuk menganalisis tingkat kegempaan wilayah Jawa Timur. Parameter tersebut dihitung berdasarkan data katalog gempa bumi International Seismological Center (ISC) dalam rentang waktu antara tahun 1980-2020. Tujuan dari penelitian iniadalah untuk menentukan parameter seismisitas dan distribusi spasial dan temporalnya sehingga proses deteksi dan peringatan dini gempa bumi di Jawa Timur dapat berjalan secara optimal. Parameter seismistas dihitung dengan menggunakan metode Maximum Curvature (MaxC). Metode MaxC dalam menentukan parameter seismisitas terdiri dari proses menentukan titik kelengkungan maksimum dengan menghitung nilai maksimum dari turunan pertama kurva distribusi Frekuensi-Magnitudo (FMD). Variasi parameter seismisitas kemudian dipetakan secara spasial dan temporal setiap sepuluh tahun dalam kurun waktu 50 tahun terakhir untuk melihat perubahan variasi parameter seismisitas. Hasil penelitian menunjukkan Mc-value 3,4 – 4,8; a-value 5,560 - 8,244; dan b-value (0,73 – 0,82 ± 0.13). Daerah yang memiliki b-value rendah (0,73 ± 0.13) berada di sekitar wilayah selatandai Jawa Timur. Wilayah ini diindikasikan sebagai daerah dengan pelepasan momen seismik yang tinggi dan memiliki akumulasi tingkat stress batuan yang tinggi. Mengetahui dan memahami hubungan antara parameter seismistas dan struktur tektonik dapat membantu kita untuk menentukan tingkat resiko bencana gempa bumi di wilayah Jawa Timur.
{"title":"Analisis Tingkat Kegempaan Wilayah Jawa Timur berbasis Distribusi Spasial dan Temporal Magnitude Of Completeness (Mc), A-Value Dan B-Value","authors":"Uswatun Chasanah, Eko Handoyo","doi":"10.13057/IJAP.V11I2.45984","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.45984","url":null,"abstract":"Distribusi spasial dan temporal dari parameter seismisitas yang terdiri dari magnitude of completeness (Mc), a-value, dan b-value telah dihitung sebagai upaya untuk menganalisis tingkat kegempaan wilayah Jawa Timur. Parameter tersebut dihitung berdasarkan data katalog gempa bumi International Seismological Center (ISC) dalam rentang waktu antara tahun 1980-2020. Tujuan dari penelitian iniadalah untuk menentukan parameter seismisitas dan distribusi spasial dan temporalnya sehingga proses deteksi dan peringatan dini gempa bumi di Jawa Timur dapat berjalan secara optimal. Parameter seismistas dihitung dengan menggunakan metode Maximum Curvature (MaxC). Metode MaxC dalam menentukan parameter seismisitas terdiri dari proses menentukan titik kelengkungan maksimum dengan menghitung nilai maksimum dari turunan pertama kurva distribusi Frekuensi-Magnitudo (FMD). Variasi parameter seismisitas kemudian dipetakan secara spasial dan temporal setiap sepuluh tahun dalam kurun waktu 50 tahun terakhir untuk melihat perubahan variasi parameter seismisitas. Hasil penelitian menunjukkan Mc-value 3,4 – 4,8; a-value 5,560 - 8,244; dan b-value (0,73 – 0,82 ± 0.13). Daerah yang memiliki b-value rendah (0,73 ± 0.13) berada di sekitar wilayah selatandai Jawa Timur. Wilayah ini diindikasikan sebagai daerah dengan pelepasan momen seismik yang tinggi dan memiliki akumulasi tingkat stress batuan yang tinggi. Mengetahui dan memahami hubungan antara parameter seismistas dan struktur tektonik dapat membantu kita untuk menentukan tingkat resiko bencana gempa bumi di wilayah Jawa Timur.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42556877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-17DOI: 10.13057/IJAP.V11I2.51243
I.A.N Pramadyanti, I. Atmika, I. Subagia
The experiment about the bending behavior of pipe composite based under the low-temperature treatment was carried out. As for the background of this research is that composite material become a suitable design with user need and it has behavior to substitute metal in engineering products. The research aims to investigate the effect of low temperature against to bending strength behavior of pipe from composite epoxy with jute fiber reinforcement. The low-temperature treatment was applied through an immersion process in dry ice as long as 60 minutes to produces a temperature of -33oC. The pipe composite was manufactured in lamination three layers of jute fabric using the vacuum injection molding process (VRTM). Then, the strength of the composite pipe was tested on the three-point bending method according to the ASTM D 790 standard. The testing results show that composite pipe with low-temperature treatment has a flexural strength average of about 76.559 MPa. Meanwhile, the compo-site pipe without treatment shows the strength of flexural average of about 52.435 MPa. They have the strength of flexural inclination is an average of 68%. In addition, the failures of composite in three-point bending test shows a shrank mode on the compression side and flat tearing at tension side due to the material becomes brittle. The conclusion that low-temperature treatment has an effective influence on the pipe composite mechanical properties.
对管道复合材料在低温处理下的弯曲性能进行了试验研究。本研究的背景是复合材料成为一种适合用户需求的设计，具有在工程产品中替代金属的性能。本研究旨在研究低温对黄麻纤维增强环氧树脂复合管弯曲强度行为的影响。低温处理是通过在干冰中浸泡60分钟的过程进行的，温度为-33摄氏度。采用真空注射成型工艺（VRTM）将三层黄麻织物层压制成管道复合材料。然后，根据ASTM D 790标准，采用三点弯曲法对复合管的强度进行测试。试验结果表明，经过低温处理的复合管的抗弯强度平均约为76.559MPa。同时，未经处理的复合管的弯曲平均强度约为52.435MPa。它们具有的弯曲倾斜强度平均为68%。此外，复合材料在三点弯曲试验中的失效表现为压缩侧的收缩模式和拉伸侧的平面撕裂，这是由于材料变脆所致。结论：低温处理对管材复合材料的力学性能有显著影响。
{"title":"Pengaruh Temperatur Rendah pada Sifat Bending dari Pipa Komposit Epoxy dengan Penguatan Serat Jute","authors":"I.A.N Pramadyanti, I. Atmika, I. Subagia","doi":"10.13057/IJAP.V11I2.51243","DOIUrl":"https://doi.org/10.13057/IJAP.V11I2.51243","url":null,"abstract":"The experiment about the bending behavior of pipe composite based under the low-temperature treatment was carried out. As for the background of this research is that composite material become a suitable design with user need and it has behavior to substitute metal in engineering products. The research aims to investigate the effect of low temperature against to bending strength behavior of pipe from composite epoxy with jute fiber reinforcement. The low-temperature treatment was applied through an immersion process in dry ice as long as 60 minutes to produces a temperature of -33oC. The pipe composite was manufactured in lamination three layers of jute fabric using the vacuum injection molding process (VRTM). Then, the strength of the composite pipe was tested on the three-point bending method according to the ASTM D 790 standard. The testing results show that composite pipe with low-temperature treatment has a flexural strength average of about 76.559 MPa. Meanwhile, the compo-site pipe without treatment shows the strength of flexural average of about 52.435 MPa. They have the strength of flexural inclination is an average of 68%. In addition, the failures of composite in three-point bending test shows a shrank mode on the compression side and flat tearing at tension side due to the material becomes brittle. The conclusion that low-temperature treatment has an effective influence on the pipe composite mechanical properties.","PeriodicalId":31930,"journal":{"name":"Indonesian Journal of Applied Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45649672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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