Positron最新文献_第3页

Seismic Site Classification Using the Multichannel Analysis of Surface Waves Method 基于多通道表面波分析方法的地震场址分类

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.53869

E. Syamsuddin, S. Aswad, Muhammad Alimuddin Hamzah Assegaf, S. Rasimeng, Sakka Sakka, S. Syamsuddin, Muhammad Nasri, Mufly Fadla Syihab

{"title":"Seismic Site Classification Using the Multichannel Analysis of Surface Waves Method","authors":"E. Syamsuddin, S. Aswad, Muhammad Alimuddin Hamzah Assegaf, S. Rasimeng, Sakka Sakka, S. Syamsuddin, Muhammad Nasri, Mufly Fadla Syihab","doi":"10.26418/positron.v12i2.53869","DOIUrl":"https://doi.org/10.26418/positron.v12i2.53869","url":null,"abstract":"The soil has a variety of qualities that affect its ability to support the weight of a structure. One of these features is soil stiffness, which can be determined using the surface wave method to prevent soil collapse. Multichannel Analysis of Surface Waves (MASW) is one of the non-invasive methodologies used in this study to investigate subsurface structures in North Sumatra, Indonesia. This method utilizes the dispersion properties of Rayleigh waves, producing a dispersion curve to get the shear wave velocity (Vs) through inversion. The shear wave velocity can be used to examine the soil stiffness qualities. The dispersion curve explains the relationship between shear wave velocity and depth, which can subsequently be used as a site class parameter. This survey uses three lines with one shot for each line which uses thirty geophones. The seismic source used is a gun with the type M16.38 Cal. Each line consists of 30 geophones with a distance of 5 m. The entire track is 160 m long and lasts for 2048 seconds with a sampling rate of 0.00025 seconds. The average shear wave velocity measured at three measurements was 372.5 m/s on line P1, 347.1 m/s on line P2A, and 311.0 m/s on line P2B, respectively. Overall, the soil classification on the P1 line is class C, and the P2A and P2B lines are class D, which is suitable for development planning areas.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43799477","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}

引用次数: 0

Study of Single Diode Model of DSSC Based on Reduced Graphene Oxide as Counter Electrode 基于还原氧化石墨烯对电极的DSSC单二极管模型研究

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.54272

A. Aprilia, F. Yuliasari, R. Siregar, N. Syakir, A. Bahtiar, L. Safriani, S. Hidayat, Iip Hanipah, F. Fitrilawati

{"title":"Study of Single Diode Model of DSSC Based on Reduced Graphene Oxide as Counter Electrode","authors":"A. Aprilia, F. Yuliasari, R. Siregar, N. Syakir, A. Bahtiar, L. Safriani, S. Hidayat, Iip Hanipah, F. Fitrilawati","doi":"10.26418/positron.v12i2.54272","DOIUrl":"https://doi.org/10.26418/positron.v12i2.54272","url":null,"abstract":"We studied the characteristic of reduced graphene oxide (RGO) as a counter electrode (CE) in Pt-free dye-sensitized solar cell (DSSC) using single diode model equation based on current density-voltage (J-V) measurement. The electrical characteristics of DSSC was investigated by electrochemical impedance spectroscopy (EIS) in order to knowing the catalytic properties of RGO as counter electrode. The RGO thin film as CE was deposited on fluorine-doped tin oxide (FTO) substrate and stacked with FTO/TiO2/ruthenium dye/mosalyte/RGO/FTO DSSC structure. The RGO film was obtained from GO (graphene oxide) film that was thermally reduced at 200°C for one hour under argon flow. The performance of DSSC with RGO as CE was characterized by current-voltage measurement and the interface between each layer was observed by Electrochemical Impedance Spectroscopy (EIS). The device efficiency (η) of DSSC that used GO and RGO film as CE are 0.09% and 3.43%, respectively. DSSC parameters such as series resistance (RS) shunt resistance (RSH), and ideality factor (n) were obtained from J-V curve which analyzed using single diode model equation. All samples have a Rs value of 2 indicates that all devices have a good ohmic contact. The RSH of device using RGO-1mg/ml is increase (from 2850 to 3670 Ω.cm2) compared with GO indicate that thermal reduction is successes. The RGO film shows a comparable performance to Pt-conventional CE thus it is a good candidate as alternative of DSSC counter electrode.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46561799","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}

引用次数: 0

Application of Unmanned Aerial Vehicles for Micro-Small and Medium Enterprises Agricultural in West Java 无人机在西爪哇农业微型中小企业中的应用

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.54176

I. K. A. S. Sawita, M. Evita, Hansel Kane, Fadhil Rausyanfikr, M. Djamal

{"title":"Application of Unmanned Aerial Vehicles for Micro-Small and Medium Enterprises Agricultural in West Java","authors":"I. K. A. S. Sawita, M. Evita, Hansel Kane, Fadhil Rausyanfikr, M. Djamal","doi":"10.26418/positron.v12i2.54176","DOIUrl":"https://doi.org/10.26418/positron.v12i2.54176","url":null,"abstract":"Agricultural Micro-Small and Medium Enterprises (MSMEs) play a vital role in maintaining national food security. In terms of sources of economic growth, the agricultural sector is the largest contributor to West Java's economic growth in the first quarter of 2021. The agricultural business sector contributed as much as 0.94%, greater than its contribution in the fourth quarter of 2020 which amounted to 0.39%. MSMEs still have external and internal constraints, especially in terms of financing, product marketing, and lack of access to information. These constraints often hinder MSMEs in developing their business and expanding their market share. From various cases of marketing agricultural MSME products in West Java, it is necessary to implement technology to market agricultural commodities. One of them is a map application, which is useful in providing the location of agricultural MSMEs and how to reach that location from the customer's current location. So that sellers/farmers and buyers can do direct transactions. Therefore, map applications using Unmanned Aerial Vehicles (UAV) can be used as the alternative technology to solve that problem. While, this research only focuses on generating the map. UAV - DJI Phantom 4 Pro has been used in this research to take images at each location of the sample locations. To control the UAV automatically for each mission, it used Pix4D capture flight plans. The data were processed by Agisoft Metashape Professional software. The location of image data collection was carried out in various areas: a building, an open space area and a real small and medium agriculture enterprises location. Two-dimensional maps and 3D maps of these areas have been successfully created. The average RMS error is 0.17 (2.88 pixels) indicating under 1% of the average error.","PeriodicalId":31789,"journal":{"name":"Positron","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41514943","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}

引用次数: 0

Integration of Topex Satellite Gravity and DEM SRTM Imagery for Subsurface Structure Identification at Tiris Geothermal Area, Lamongan Volcano Complex, Probolinggo, East Java Topex卫星重力和DEM SRTM图像的集成，用于识别东爪哇普罗布林戈拉蒙甘火山复合体蒂里斯地热区的地下结构

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.56880

S. H. Siombone, A. Susilo, S. Maryanto

{"title":"Integration of Topex Satellite Gravity and DEM SRTM Imagery for Subsurface Structure Identification at Tiris Geothermal Area, Lamongan Volcano Complex, Probolinggo, East Java","authors":"S. H. Siombone, A. Susilo, S. Maryanto","doi":"10.26418/positron.v12i2.56880","DOIUrl":"https://doi.org/10.26418/positron.v12i2.56880","url":null,"abstract":"Tiris area is one area that has geothermal prospects. Tiris area is located in the Tiris sub-district, Probolinggo regency, East Java. This study aims to identify the subsurface structure of the Tiris geothermal area using Topex gravity and DEM SRTM imagery data. The Topex gravity data obtained is still in Free Air Anomali (FAA) form, so it is necessary to make Bouguer and terrain corrections to get a complete Bouguer anomaly. A residual Bouguer anomaly is needed to study shallow subsurface structures. This anomaly is obtained by separating the residual and regional anomalies from the complete Bouguer anomaly using the moving average method. The study area has residual Bouguer anomaly values ranging from -0.5 to 2.9 mGal. The low residual Bouguer anomalies are seen in the body of the Lamongan volcano (LV) and the Tiris geothermal area (TGA). The study of subsurface structures is focused on the LV and the TGA through Forward 2D modeling. The A-A' cross-section illustrates the subsurface of LV, while the B-B' cross-section illustrates the subsurface of TGA. Cross-section A-A' modeling results show that the source of the low anomaly is in the second layer D2 = 1.24 g/ at a depth of 4.0 to 0.6 km below sea level and is suspected to be magma because it has a low density. Cross-section B-B' modeling obtained a low anomaly source at the second layer D2 = 2.03 g/ at a depth of 4.0 to 2.8 km below sea level and is suspected to be intrusive rock. The lineament display on the 2D of DEM SRTM map for the 45o and 135o azimuths shows that the TGA region has a high lineament density, and the orientation of the surface geological structure in the study area is dominant in a northwest-southeast direction.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45055864","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}

引用次数: 0

Deteksi dan Kuantifikasi Internal Wave Menggunakan Instrumen Broadband Echosounder SIMRAD EK80 di Perairan Padang Bay Bali 利用SIMRAD EK80宽带回声测深仪对巴厘湾水域内波的探测与定量

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.51854

Edriyan Situmorang, H. Manik, A. S. Atmadipoera

引用次数: 0

Performance Analysis of Multiple Input Multiple Output (MIMO) Multi-Carrier Code-Division Multiple Access (MC-CDMA) Combined with Quasi-Orthogonal Space Time Block Coding (QO-STBC) in Rayleigh Fading Channel 多输入多输出(MIMO)多载波码分多址(MC-CDMA)与准正交空时分组编码(QO-STBC)在瑞利衰落信道中的性能分析

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.46613

E. Kusumawardhani, R. P. Astuti, N. Adriansyah, Fitri Imansyah, L. Putra

{"title":"Performance Analysis of Multiple Input Multiple Output (MIMO) Multi-Carrier Code-Division Multiple Access (MC-CDMA) Combined with Quasi-Orthogonal Space Time Block Coding (QO-STBC) in Rayleigh Fading Channel","authors":"E. Kusumawardhani, R. P. Astuti, N. Adriansyah, Fitri Imansyah, L. Putra","doi":"10.26418/positron.v12i2.46613","DOIUrl":"https://doi.org/10.26418/positron.v12i2.46613","url":null,"abstract":"The need for a communication system with a higher data rate and mobility grows along with information and communication technology development. Combining MC-CDMA with the MIMO system and supporting the system with a good transmit diversity technique is a promising idea to provide the needed communication system, especially in high mobility conditions. MC-CDMA can support ubiquitous communications without affecting the achievable BER and is more capable of high-speed mobility. It integrates the benefit of both OFDM and CDMA. On the other hand, QO-STBC increases the bit rate without using additional bandwidth to transmit diversity in the MIMO system. So, this study proposed a system combining the MIMO MC-CDMA system with QO-STBC. The proposed system is investigated under high mobility conditions to see the system's performance. The simulation results show that our system performs better than the MC-CDMA STBC system and the QOSTBC system but not better than the MC-CDMA multilevel coding scheme. To reach the value of BER 10−3, MC-CDMA multilevel Coding requires less power, around 5 dB, than the proposed system.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42474251","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}

引用次数: 0

Simulasi Pelelehan Freeze Plug Termodifikasi pada Molten Salt Reactor Menggunakan Metode Moving Particle Semi-implicit 基于半隐式粒子移动法的熔盐反应器除堵改造模拟

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.57434

Banafsaj Fatiya Nabiilah, Asril Pramutadi Andi Mustarib, Y. Yulianto

{"title":"Simulasi Pelelehan Freeze Plug Termodifikasi pada Molten Salt Reactor Menggunakan Metode Moving Particle Semi-implicit","authors":"Banafsaj Fatiya Nabiilah, Asril Pramutadi Andi Mustarib, Y. Yulianto","doi":"10.26418/positron.v12i2.57434","DOIUrl":"https://doi.org/10.26418/positron.v12i2.57434","url":null,"abstract":"In the Molten Salt Reactor, the freeze plug is one of the components that plays an important role when a reactor accident occurs. In designing the freeze plug, the selection of the constituent material is based on the ability of the material to spread the heat. Therefore, studies on material selection are needed to provide information regarding freeze plug design. The modified freeze plug melting process has been simulated using the Moving Particle Semi-Implicit method. This study aims to observe the behavior of the modified freeze plug melting phenomena and to see the effect of the conductivity value on the melting process. The alloys used around frozen salts with different thermal conductivity are Hastelloy-N, Heynes-242, and ODS Alloy (MA754). The simulation results show that the time required for frozen salt to melt in Hastelloy-N, Heynes-242 variations , and ODS Alloy (MA754) are 12.3 seconds each; 12.7 seconds; and 24.3 seconds. The results obtained explain that freeze plugs with metal alloys that have the highest thermal conductivity require a shorter time to reach the melting point. This shows that the greater the thermal conductivity value, the easier it is to spread heat to the alloy that hits the frozen salt.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46032839","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}

引用次数: 0

Perluasan Kinerja Akustik Limbah Kayu Batang Kelapa Sawit Termodifikasi Bahan Formaldehida 油棕茎木材的声音废物改进了甲醛材料

Positron Pub Date : 2022-11-30 DOI: 10.26418/positron.v12i2.55963

Tetti Novalina Manik, Shaliha Shaliha, S. Siregar, Tanto Budi Santoso, I. Yahya, Mashuri Mashuri, Muhammad Zainuri, Darminto Darminto

引用次数: 0

Analisis Kecenderungan Hujan Ekstrem Berbasis Indeks Iklim Ekstrem Periode Tahun 1990-2019 di Kalimantan Barat 分析了1990年至2019年在加里曼丹西部以气候极端为基础的极端降雨趋势

Positron Pub Date : 2022-05-31 DOI: 10.26418/positron.v12i1.47312

Riri Nur Ariyani, Muliadi Muliadi, Riza Adriat

{"title":"Analisis Kecenderungan Hujan Ekstrem Berbasis Indeks Iklim Ekstrem Periode Tahun 1990-2019 di Kalimantan Barat","authors":"Riri Nur Ariyani, Muliadi Muliadi, Riza Adriat","doi":"10.26418/positron.v12i1.47312","DOIUrl":"https://doi.org/10.26418/positron.v12i1.47312","url":null,"abstract":"Perubahan iklim dapat meningkatkan peluang kejadian cuaca/iklim ekstrem. Salah satu dampak cuaca/iklim ekstrem adalah bencana hidrometeorologi, termasuk banjir. Banjir merupakan bencana paling banyak terjadi di Kalimantan Barat periode tahun 1998-2019. Salah satu faktor pemicu terjadinya banjir ialah hujan ekstrem. Durasi, intensitas, maupun frekuensi hujan ekstrem dapat diidentifikasi menggunakan Indeks Iklim Ekstrem (IIE) parameter hujan. Informasi terkait kecenderungan hujan ekstrem diperlukan untuk mendukung pembangunan berbagai sektor, terutama mitigasi bencana hidrometeorologi. Oleh sebab itu tujuan penelitian ini menganalisis kecenderungan hujan ekstrem berdasarkan delapan jenis nilai IIE di Kalimantan Barat. Data yang digunakan adalah data curah hujan harian periode tahun 1990-2019 pada 14 lokasi di Kalimantan Barat. Data curah hujan harian digunakan untuk menghitung nilai IIE menggunakan perangkat lunak RClimDex. Analisis kecenderungan menggunakan metode Uji Mann-Kendall, dengan tingkat kepercayaan ditentukan sebesar 95%. Hasil menunjukkan telah terjadi kecenderungan nilai IIE secara signifikan pada empat lokasi penelitian. Nilai Consecutive Dry Day (CDD) mengalami kecenderungan menurun di Bengkayang mengindikasikan hari kering cenderung terakumulasi pada suatu waktu yang relatif lebih singkat. Kemudian di Sekayam, Kabupaten Sanggau nilai CDD meningkat, namun Consecutive Wet Day menurun mengindikasikan periode jeda hujan semakin meningkat, namun hujan menjadi lebih lebat. Nilai Max 5-day precipitation amount meningkat di Sungai Raya, Kabupaten Kubu Raya terkait dengan perubahan tutupan lahan yang terjadi secara drastis. Nilai Annual total wet days precipitation dan Number of days above 50 mm di Karangan, Kabupaten Landak meningkat bersesuaian dengan kejadian banjir yang juga meningkat.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47371939","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}

引用次数: 0

Identifikasi Zona Reservoir Panas Bumi Gunung Ijen Jawa Timur Berdasarkan Pemodelan 2 Dimensi Anomali Geomagnetik 基于2型地磁异常维数的地球热储层带东爪哇山Agent识别

Positron Pub Date : 2022-05-31 DOI: 10.26418/positron.v12i1.49130

A. Muchtar, Z. K. Manurung, R. Rustadi, Yasa Suparman, M. I. Jumarang

{"title":"Identifikasi Zona Reservoir Panas Bumi Gunung Ijen Jawa Timur Berdasarkan Pemodelan 2 Dimensi Anomali Geomagnetik","authors":"A. Muchtar, Z. K. Manurung, R. Rustadi, Yasa Suparman, M. I. Jumarang","doi":"10.26418/positron.v12i1.49130","DOIUrl":"https://doi.org/10.26418/positron.v12i1.49130","url":null,"abstract":"Komplek Gunung api Ijen merupakan prospek panas bumi yang terletak di Kabupaten Bondowoso, Jawa Timur. Sistem panas bumi Gunung api Ijen ditandai oleh kawah danau berfluida asam dan solfatara bertemperatur tinggi. Beberapa batuan teralterasi di dekat Gunung Kukusan dan sekelompok mata air panas Blawan di bagian utara kaldera. Pengukuran magnetik dilakukan pada 175 titik tersebar di dalam kaldera melingkupi kawah Gunung Ijen hingga Gunung Merapi. Anomali intensitas magnetik total diperoleh melalui koreksi standard IGRF dan variasi diurnal. Metode reduksi ke kutub (RTP) diterapkan dengan inklinasi geomagnet sekitar -32°. Secara umum, hasil penelitian menunjukkan bahwa anomali magnetik tinggi berasosiasi dengan jalur patahan yang menghasilkan pembentukan gunung api baru di bagian selatan, Sedangkan anomali magnetik rendah berada berdekatan dengan kawah Ijen dan Gunung Merapi di bagian timur. Anomali yang rendah ditafsirkan oleh dua kemungkinan pengaruh demagnetisasi batuan akibat kontak termal atau pengaruh remanen batuan dengan umur geologi tertentu menghasilkan polaritas reversal. Anomali intensitas magnet total tinggi pada komponen regional berada 50 hingga 114 nT dan anomali rendah berada di kisaran -850 hingga –750 nT, hal ini ditafsirkan bahwa potensi batuan panas di Komplek Gunung api Ijen tersebar sesuai keberadaan kaldera dan jalur gunung api muda. Prospek batuan panas berkorelasi dengan Formasi batuan gunung api muda dan intrusi magmatic hasil proses pembentukan gunung api berumur Kuarter.","PeriodicalId":31789,"journal":{"name":"Positron","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48339658","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}

引用次数: 0