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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences POSITRON Jurnal Penelitian Fisika dan Aplikasinya (JPFA) JURNAL FISIKA Journal of Information Technology and Computer Science Jurnal Penelitian Pendidikan IPA (JPPIPA) Sriwijaya Bioscientia
Rosid, Mohammad Syamsu
Department Of Physics, FMIPA Universitas Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Physics

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Kajian pustaka asesmen status kondisi ekosistem mangrove Gathot Winarso; Muhammad Kamal; Mohammad Syamsu Rosid; Wikanti Asriningrum; Jatna Supriatna
Sriwijaya Bioscientia Vol 1 No 2 (2020)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1348.347 KB) | DOI: 10.24233/sribios.1.2.2020.200

Abstract

The mangrove area of the world has been decreasing and Indonesia has lost 1.6 million ha of mangrove during the period 1980-2005. In 2015 the status of Indonesia's mangroves was 3.5 million ha with 48% in good condition and 52% in degraded conditions. Therefore, mangrove forests should be conserved properly and utilized sustainably. Assessment of the status of mangrove conditions is essential in conservation planning and management so that it can be done better. However, the method for assessing the condition of mangrove forests is still diverse and has not been standardized, so a literature review and review of how to assess the condition of mangrove ecosystems from various literature needs to be done. The results of the study of various literatures, in general there are two types of assessments. The first assessment used canopy density indicators, tree density, structure and composition of vegetation including diversity index and environmental parameters which are used singly or a combination of some or all parameters and some that be correlated with ecological integrity. For the second assessment, using a comparison between the existing mangrove forest and the potential area to be overgrown with mangroves. There is a difference when assessing the potential area, there is the opinion of the area potentially seen by the status of the area whether or not the forest area, from the landsystem, the level of abrasion, pond area and the comparison of the coastline length overgrown with mangrove with a total coastline length. Both assessments with each indicator can be used in accordance with the objectives of the assessment of the condition.
The Existence of Faults that Cause Earthquakes on Lombok Island: A Critical Literature Review I Gusti Ketut Satria Bunaga; Mohammad Syamsu Rosid; Titi Anggono
Jurnal Penelitian Pendidikan IPA Vol. 8 No. 6 (2022): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i6.2346

Abstract

This study qualitatively elaborates fault characteristics causing earthquakes in Lombok Island. Historically, Lombok Island has been 12 destructive and significant earthquakes in period of 1979 – 2018. Therefore, the island is in an earthquake-prone region. The hazard factor is one of the key factors in assessing risk. This study become important as their potential to have a big impact. A source of activity that has not been fully investigated in detail was the location of the recent major and devastating earthquake (East Lombok earthquake 2019). Consequently, there is a chance that the level of risk on the Island of Lombok will rise. According to the study’s results, a thorough investigation is required to identify and pinpoint the cause of the 2019 Lombok earthquake in order to improve the earthquake risk index and help the local government to reduce losses due to earthquakes.
Identifikasi Bidang Gelincir dengan Metode Geolistrik Tahanan Jenis 2 Dimensi di Daerah Keranggan, Tangerang Selatan Miftahul Farhati; Mohammad Syamsu Rosid
POSITRON Vol 12, No 1 (2022): Vol. 12 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (902.95 KB) | DOI: 10.26418/positron.v12i1.53584

Abstract

Daerah Keranggan, Tangerang Selatan yang menjadi wilayah penelitian merupakan salah satu kawasan di Indonesia yang berpotensi longsor. Wilayah ini memiliki karakter tanah bergerak dengan adanya lereng yang sangat curam. Pada rumah-rumah warga di atas lereng timbul retakan sejajar lereng yang mengindikasikan adanya pergerakan tanah. Oleh karena itu dilakukan pengukuran geolistrik tahanan jenis 2 dimensi untuk mengetahui struktur litologi bawah permukaan yang berpotensi dapat berperan sebagai bidang gelincir. Pengukuran menggunakan konfigurasi Wenner-Schlumberger multichannel di 2 lintasan berarah Barat-Timur. Panjang lintasan 1 dan 2 secara berturut-turut adalah 117,5 dan 105 meter dengan jarak antar elektroda 2,5 meter. Dari hasil korelasi model tahanan jenis, data geologi regional, dan data sumur gali warga lokal, diyakini bahwa litologi penyusun di wilayah penelitian terdiri dari batuan lempung, batu pasir, dan konglomerat batu apung yang merupakan bagian dari Formasi Serpong. Dari model tahanan jenis terindikasi adanya bidang gelincir dengan litologi batu lempung di atas konglomerat batu apung dengan kemiringan 53o tepat di bawah lereng. Diduga kuat bidang gelincir ini memicu terbentuknya lereng di permukaan dengan kemiringan serupa sekitar 53o. Kedua faktor tersebut diperparah dengan beban yang tinggi dari jumlah penduduk dan kendaraan di atasnya, serta getaran yang berasal dari aktivitas manusia sehari-hari.
Identifying Pore Type of Lagoon and Barrier Carbonate to Model Shear Wave Velocity in Salawati Basin by Differential Kuster-ToksÖz Wulandari, Yulia Putri; Rosid, Mohammad Syamsu
POSITRON Vol 13, No 1 (2023): Vol. 13 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v13i1.63761

Abstract

The shape of pores in sedimentary rocks is dependent on the geometric structure of the rock matrix grains. Carbonate rocks have more complex pore types compared to clastic due to the effects of diagenesis and the depositional environment. The study analyzed the deposition of Kais carbonate in barrier and lagoon environments. It categorized the pores into inter-particle, moldic/vuggy, and micro-cracks. The type of pore in a rock is directly related to its stiffness and shear resistance, which influences its shear wave velocity (Vs). Thus, a higher shear modulus leads to a higher Vs value. Reservoir characterization heavily relies on the Vs data. However, this data is limited to the observed area. Therefore, Vs modeling is a more effective and efficient approach. The modeling will conduct thoroughly with the identification of the pore type. The rocks moduli are calculated by the pore inclusion method using the differential Kuster-Toksöz (DKT) equation and defining the aspect ratio, reflecting the pore type. The YP-1 well has barrier carbonate, while YP-2 and YP-3 have lagoon carbonate with inter-particle as the primary pore type. Micro-cracks on top of Kais are present. YP-4 and YP-5 have similar proportions of micro-cracks and inter-particle as dominant pore types. The predicted Vs and measured logs strongly correlate with an R2 value above 0.8. The Vs value range for micro-cracks is 2,300 ft/s to 6,000 ft/s, and for inter-particle, it is 6,000 ft/s to 8,500 ft/s. Pore types above 8,500 ft/s are very stiff (moldic pore type).
Optimasi Hyperparameter pada Model XGBoost untuk Estimasi Curah Hujan: Studi Kasus Kota Pontianak Auriwan Yasper; Djati Handoko; Maulana Putra; Harry Kasuma Aliwarga; Mohammad Syamsu Rosid Rosid
Jurnal Penelitian Pendidikan IPA Vol. 9 No. 9 (2023): September
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i9.3890

Abstract

Estimating rainfall accurately is crucial for both the community and various institutions involved in managing water resources and preventing disasters. The XGBoost model has demonstrated its effectiveness in predicting rainfall, but it still requires fine-tuning of hyperparameters to enhance its performance. This study seeks to determine the optimal learning rate for rainfall prediction while keeping the max_depth and n_estimator parameters fixed. The hyperparameter optimization process was carried out using a two-step approach: an initial coarse search using RandomizedSearchCV followed by a more detailed fine-tuning using GridSearchCV. The model's foundation relied on historical rainfall data gathered over three months from the Automated Weather Observed System (AWOS) at the Pontianak Meteorological Station, recorded on an hourly basis. To assess the model's performance, several metrics were employed, including accuracy, precision, recall, F1 score, and ROC-AUC. The model demonstrated promising results, with accuracy, precision, recall, and F1 score all reaching 95%, indicating its ability to effectively predict rainfall. However, the ROC-AUC score was somewhat lower at 62%. After conducting the hyperparameter search, the optimal learning rate determined for the model, utilizing the 2040 dataset, was found to be 0.204.
Inherent Optical Properties Attenuation Coefficient Modelling for Optical Shallow Water in Kepulauan Seribu of Jakarta, Indonesia Setiawan, Kuncoro Teguh; Rosid, Mohammad Syamsu; Manessa, Masita Dwi Mandini; Suardana, A.A. Md. Ananda Putra; Adi, Novi Susetyo; Winarso, Gathot; Osawa, Takahiro; Asriningrum, Wikanti; Supardjo, Harsono
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 29, No 2 (2024): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.29.2.222-232

Abstract

Technology to obtain bathymetric information has become necessary considering the length of the coastline and the many islands owned by Indonesia. Measurement technology using multi-beam and single-beam echo sounders is still an alternative to producing bathymetric information. In shallow water, using echo sounders has constraints and limitations, such as being time-consuming, costly and prone to equipment damage. Remote sensing technology is an alternative to obtaining bathymetric information in shallow waters. Bathymetric modelling with analytical and semi-analytic models from satellites requires attenuation coefficients. Therefore, attenuation coefficient models are essential for satellite data. Attenuation coefficient studies using inherent optical properties (IOP) parameters have not yet been studied to determine Kepulauan Seribu bathymetry, Jakarta, Indonesia. The IOP modelling is determined by absorption and backscatter parameters. Chlorophyll-a Total influences these parameters: Total Suspended Matter (TSM) and Coloured Dissolved Organic Matter (CDOM). This study was performed to determine the attenuation coefficient model using multispectral remote sensing in the Kepulauan Seribu and applied five approaches to determining the attenuation coefficient via IOP: the Gordon, Kirk, Morel, Lee and Simon models. The five models' IOP attenuation coefficient results were compared to the in-situ attenuation coefficient value and evaluated. The results of IOP attenuation coefficient modeling of multispectral remote sensing based on the condition of local water parameters is Kd(λ) = 1.4369 ((a(λ) + b(λ)) / Cos θ) + 0.072. based on the modified Gordon method, The modelling results were obtained with an accuracy of 0.98 determination coefficient (R2) and 0.029 Root Mean Square Error (RMSE).
Identifikasi Potensi Jebakan Hidrokarbon di Daerah “X” Sedimen Pra-Tersier Cekungan Sumatra Utara Menggunakan Data Gravitasi dan Seismik Rosid, Mohammad Syamsu
Jurnal Fisika Vol 10, No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v10i1.23955

Abstract

Penemuan minyak dan gas bumi pada cekungan di Indonesia yang umumnya berasal lapisan tersier, saat ini terus mengalami pengurangan. Oleh karena itu eksplorasi hidrokarbon terus dilakukan melalui diversifikasi pencarian lapangan baru dan penggunaan konsep reservoar baru. Studi di daerah “X” pada Cekungan Sumatra Utara ini bertujuan untuk menemukan reservoar hidrokarbon baru dengan menggunakan konsep baru lapisan pra-tersier. Oleh karena itu, perlu untuk mengidentifikasi keberadaan lapisan basemen pra-tersier sebagai batas dari lapisan yang berpotensi sebagai reservoir. Metode yang digunakan dalam penelitian ini adalah pemodelan ke depan 2D data gravitasi yang didukung oleh data sekunder penampang seismik. Model bawah permukaan telah dibuat dalam 2 penampang, lintasan 4 dan lintasan 6. Selain itu, metode FHD (first horizontal derivative) dan SVD (second vertical derivative) dilakukan juga untuk mengkarakterisasi struktur patahan yang ada. Hasil pemodelan ke depan 2D pada lintasan 4 dan 6 menunjukkan adanya basemen pra-tersier pada kedalaman sekitar 6.000 m. Hasil pemodelan juga menunjukkan adanya beberapa formasi batuan di atas lapisan basemen yang terdiri dari formasi pra-tersier dan tersier. Struktur yang ditunjukkan dalam analisis FHD dan SVD sebagian besar adalah sesar naik. Hasil gravitasi dikonfirmasi oleh data dari penampang seismik dan geologi. Ada dua formasi di lapisan dalam tepat di atas basemen pra-tersier yang berpotensi sebagai reservoir yang baik, yaitu Formasi Tampur yang didominasi oleh batuan karbonat dan Formasi Parapat.
Karakterisasi Reservoar Batuan Serpih Menggunakan Simultaneous Inversion di Lapangan “TAF”, Formasi Baong Bawah, Cekungan Sumatra Utara Rosid, Mohammad Syamsu
Jurnal Fisika Vol 9, No 2 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v9i2.23956

Abstract

Penelitian tentang karakterisasi reservoar batuan serpih telah dilakukan di lapangan “TAF”, Cekungan Sumatra Utara. Formasi Baong Bawah menjadi target dalam penelitian ini. Parameter impedansi-P dan impedansi-S yang dihasilkan dari metode inversi simultan digunakan dalam studi ini untuk mengidentifikasi litologi batuan dan kandungan fluida di zona target. Analisis stacking sudut secara parsial dilakukan dalam 3 kelompok besar: stacking sudut dekat (1-19°), stacking sudut menengah (19-36°) dan stacking sudut jauh (36-53°). Hasil inversi simultan menunjukkan adanya lapisan batuan serpih (shale) yang dominan di daerah ini dengan nilai impedansi-P dalam interval 4.000-8.000 (m/s)*(gr/cc), impedansi-S dalam interval 1.500-3.000 (m/s)*(gr/cc) dan nilai densitas batuannya dalam range 2.2-2.5 g/cc. Adapun nilai impedansi-P dalam interval 8.000-12.000 (m/s)*(gr/cc), impedansi-S dalam interval 3.000-5.700 (m/s)*(gr/cc) dan densitas batuan dalam range 2.5-2.75 g/cc dimiliki oleh batuan dasar dari Formasi Baong Bawah yang berasosiasi dengan dominasi batuan pasir dan karbonat. Namun demikian, hasil inversi impedansi-P dan Lambda-Rho begitu juga hasil analisa crossplot dari AI vs SI dan kurva LMR, semuanya tidak mengindikasikan adanya fluida hidrokarbon di lapisan ini.
Implementation of Rainfall Monitoring through an Information System Based on Radar and Satellite Image Data using the Kalman Filter Method Sugiarto; Putra, Maulana; Syaefudin, Mohamad Anwar; Rosid , Mohammad Syamsu; Handoko, Djati
Journal of Information Technology and Computer Science Vol. 9 No. 2: August 2024
Publisher : Faculty of Computer Science (FILKOM) Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25126/jitecs.92620

Abstract

Rainfall information is important for water resource management and disaster mitigation, so a monitoring system is needed that can provide spatial information. A rainfall monitoring information system uses radar and satellite images based on the Kalman Filter method is a website information system that aims to make it easier for users to monitor rainfall from a latitude and longitude coordinate point. The rain intensity data is in pixel colours (Red, Green, Blue) from the MAX (dBZ) product image of the EEC Weather Radar in Lampung and cloud top temperature data from the Himawari satellite. The image pixel colour data is then processed using the Kalman filter and displayed on the integrated website. The website's appearance is designed to be interactive to accommodate user customization, and the data displayed has been adapted to geographic information systems. Implementing a rainfall information system based on weather radar and satellite imagery disseminated through the website is expected to help users, both the general public and stakeholders, access real-time weather information, especially rainfall.
Relokasi Hiposenter Double Difference dan Penentuan Model Kecepatan di Jawa Bagian Barat Tahun 2010 "“ 2024 untuk Identifikasi Patahan S, Novita Sari; Rosid, Mohammad Syamsu; Anggono, Titi
POSITRON Vol 15, No 1 (2025): Vol. 15 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v15i1.91097

Abstract

Jawa bagian barat adalah daerah dengan seismisitas tinggi dipengaruhi zona subduksi dua lempeng tektonik dan keberadaan sesar aktif yang beberapa diantaranya belum terpetakan oleh PuSGeN. Penelitian ini bertujuan untuk menentukan keberadaan sesar lokal menggunakan lokasi hiposenter yang lebih akurat. Data waktu tiba gelombang P dan S diperoleh dari hasil rekaman 38 stasiun seismik BMKG periode Januari 2010 "“ Januari 2024. Terhadap 1978 events gempa bumi kerak dangkal (kedalaman ≤50 km) telah dilakukan relokasi hiposenter double difference dan model kecepatan seismik yang diperbarui. Model kecepatan yang didapat menunjukkan nilai RMS sebesar 0,52. Relokasi double difference berhasil merelokasi 1805 gempa bumi yang terjadi di Jawa bagian barat. Hasil relokasi merepresentasikan pola patahan pada kedalaman 5-20 km yang berhubungan dengan aktivitas sesar aktif lokal yang belum terpetakan dan sesar regional seperti Sesar Cimandiri, Sesar Lembang, Sesar Baribis, dan Sesar Garsela. Relokasi berhasil memetakan patahan yang belum terpetakan oleh PuSGeN seperti Sesar Citarik dan Sesar Cipamingkis dengan strike timur laut "“ barat daya dan kemiringan dip nya berturut-turut ~85 ° dan ~80 ° ke arah barat laut, serta sesar penyebab gempa bumi Cianjur dengan arah strike barat laut "“ tenggara dan sudut dip ~80 ° ke arah timur laut. Sedangkan dua sesar lainnya yang telah terpetakan yaitu Sesar Cimandiri dengan arah strike barat "“ timur, Sesar Garsela Rakutai dan Sesar Garsela Kencana mempunyai arah strike yang sama timur laut "“ barat daya dengan kemiringan dip ~60 ° ke arah tenggara.
Co-Authors Akbar, Dzikrullah Auriwan Yasper Darmanto, Aina Najwa Gathot Winarso Gathot Winarso, Gathot Handoko, Djati Harry Kasuma Aliwarga Hartagung, Riky Tri I Gusti Ketut Satria Bunaga I Gusti Ketut Satria Bunaga, I Gusti Ketut Satria Jatna Supriatna Kuncoro Teguh Setiawan, Kuncoro Teguh MASITA DWI MANDINI MANESSA, MASITA DWI MANDINI Maulana Putra Miftahul Farhati Muhammad Kamal Novi Susetyo Adi, Novi Susetyo Putra, Maulana S, Novita Sari Saputra, Frilla Renty Tama Septiadhi, Ardhianto Suardana, A.A. Md. Ananda Putra Sugiarto Supardjo, Harsono Syaefudin, Mohamad Anwar Takahiro Osawa Titi Anggono Titi Anggono Wiguna, I Putu Arix Putra Wikanti Asriningrum Wikanti Asriningrum, Wikanti Wulandari, Yulia Putri