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All Journal Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences JFA (Jurnal Fisika dan Aplikasinya) Annual Research Seminar Science and Technology Indonesia Jurnal Penelitian Sains Riau Journal of Empowerment International Journal of Remote Sensing and Earth Sciences (IJReSES) Indonesian Physical Review Jurnal Pengabdian Masyarakat Teknik SRIWIJAYA JOURNAL OF ENVIRONMENT BIOVALENTIA: Biological Research Journal Makara Journal of Science Journal of Smart Agriculture and Environmental Technology

Dedi Setiabudidaya

Department Of Physics, Faculty Of Mathematics And Natural Sciences, Sriwijaya University

Author-ID : 251044

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Veterinary

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Spatial and Temporal Variability of Sea Surface Height in the Southeastern Tropical Indian Ocean Based on the Satellite Altimeter Data Iskandar, Iskhaq; Mardiansyah, Wijaya; Setiabudidaya, Dedi
Jurnal Matematika dan Sains Vol 19 No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Sea surface height (SSH) data from merged-satellite observations (e.g. TOPEX/Poseidon, JASON and ERS) were used to evaluate the spatial and temporal variations of sea surface circulations in the southeastern tropical Indian Ocean (SETIO). A Complex Empirical Orthogonal Function (CEOF) was used to extract the dominant mode of variability in the SETIO region. The results show that the first mode accounts for 41.2% of the total variance dominates the variation. The second mode accounts for 18.2% of the total variance, while the third and the fourth modes explain 6.5% and 2.6% of the total variance, respectively. The spectrum analysis indicates that the 35-day variations is a prominent feature in all CEOF modes. Furthermore, semiannual variation at period of about 180-day was observed in the first third modes, while the annual variation of about 300-day was only observed in the first two modes. A relatively strong variation at period of around 500-day was observed in the first, second and fourth modes. It is suggested that the spatial and phase pattern of the first and third modes are related to the propagation of the Kelvin waves generated by wind stress over the equatorial Indian Ocean. On the other hand, the second was likely related to the local upwelling and downwelling generated by the seasonal changes in the alongshore winds. Furthermore, the fourth mode represents the oceanic eddy generated from the downstream straits of the Indonesian Throughflow.Variasi Spasial dan Temporal Tinggi Muka Laut di Wilayah Tropis Samudera India Bagian Tenggara Berdasarkan Data Satelit AltimetriAbstrak Data tinggi permukaan laut hasil observasi dari beberapa satelit (yaitu: TOPEX/Poseidon, JASON dan ERS) digunakan untuk evaluasi variasi spasial dan variasi temporal sirkulasi permukaan laut di wilayah tropis Samudera Hindia bagian tenggara. Analysis dilakukan menggunakan metode Complex Empirical Orthogonal Function (CEOF) untuk mendapatkan mode variasi yang dominan di wilayah ini. Hasil analisis menunjukkan bahwa mode CEOF pertama menjelaskan 41,2% dari variasi total dan merupakan mode yang paling dominan. Mode CEOF kedua mengandung 18,2% dari variasi total, sedangkan mode ketiga dan keempat menjelaskan masing-masing 6,5% dan 2,6% dari variasi total. Analisis spektrum terhadap deret waktu masing-masing mode CEOF menunjukkan bahwa variasi dalam skala 35 hari merupakan variasi yang signifikan untuk setiap mode. Selanjutnya, variasi setengah-tahunan dengan periode osilasi sekitar 180 hari terekam pada tiga mode pertama, sementara variasi tahunan dengan periode osilasi sekitar 300 hari hanya terekam pada mode pertama dan mode kedua. Variasi yang cukup kuat pada periode osilasi sekitar 500 hari terekam pada mode pertama, mode kedua dan mode keempat. Hasil analisis ini juga menunjukkan bahwa pola spasial dan fase gelombang pada mode pertama dan mode ketiga adalah terkait dengan penjalaran gelombang Kelvin yang dibangkitkan oleh stres angin di wilayah ekuator Samudera Hindia. Sementara itu, mode kedua terkait dengan proses upwelling dan downwelling yang dibangkitkan oleh angin muson di sepanjang pantai. Selanjutnya, mode keempat merepresentasikan oceanic eddy yang terbentuk dari selat-selat arus lintas Indonesia (ARLINDO). Kata kunci: Complex empirical orthogonal function, Analisis Fourier, Samudera Hindia, Tinggi permukaan laut.

Analisis Data Magnetisasi Remanen Isotermal dengan Software IRMUNMIX Setiabudidaya, Dedi
Jurnal Fisika dan Aplikasinya Vol 2, No 1 (2006)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Telah dilakukan kajian kinerja software IRMUNMIX terhadap sampel yang terindikasi hanya memiliki satu komponen mineral magnetik. Hasil menunjukkan bahwa software IRMUNMIX mampu mendeteksi komponen mineral magnetik dengan kontribusi yang sangat minimal.

EFFECT OF ARCHITECTURAL TREE MODEL TO THE NOISE LEVEL OF MOTOR VEHICLE ON DEMANG LEBAR DAUN STREET PALEMBANG Jumingan, Jumingan; Dahlan, Zulkifli; Setiabudidaya, Dedi
BIOVALENTIA: Biological Research Journal Vol. 2 No. 2 (2016)
Publisher : Biology Department, Faculty of Mathematics and Natural Sciences, Sriwijaya University

The research on the effect of architectural tree model to the noise level of motor vehicles on Demang Lebar Daun Street Palembang has been conducted. The purpose of this study was to analyze kind of architectural tree model can reduce the highest noise levels among the architectural tree models encountered and identify the architectural tree model. The method used was purposive sampling. Measurement of the noise level and architectural models were selected according to the type of the tree encountered on the left or right side of the street. The noise level measurement during the daylight was carried out simultaneously at a point of 1 meter in front of the tree, 1 and 5 meters behind the tree,for 10 minutes with the readings for every 5 seconds at 07:00, 10:00, 15:00 and 20:00. The results showed that The architectural model of Switenia magahoni tree was Rauh model, Lagerstroemia sp. tree was Troll model and Thyrsostachys siamensis tree was McClure model. The highest noise level reduction was from bamboo tree, respectively by 4,88 dB (A) and 8,52 dB (A) at the distances of 1 and 5 m.Â Keywords: noise level, reduction, architectural tree model

REVIEW OF CHARACTERISTICS AND PROPERTIES OF FE2O3/SIO2 AS WATER POLLUTION PREVENTION Balada Soerya; Jaya Edianta; Siti Lailaturofi'ah; Aniendita Ningtyas; Fitri Suryani Arsyad; Dedi Setiabudidaya; Siti Sailah
Indonesian Physical Review Vol. 5 No. 1 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i1.131

The existence of water on earth is very abundant and has a vital role in the source of life for every living creature. In managing water resources, pollution is one of the issues world researchers face. This article reviews the characteristics and methods of synthesizing Fe2O3 and SiO2 materials to prevent water pollution. The strategies administrated antecedently square measure vapor deposition, microemulsion, solvothermal, coprecipitation, sol-gel, and hydrothermal. The formation of fine quality nanoparticles with controlled size associate degreed size distribution square measure typically achieved by selecting an applicable solvent mixture and varied parameters like temperature, pressure, and time interval.

Efektivitas Elektroda pada Proses Elektrokoagulasi untuk Pengolahan Air Asam Tambang Ashari Ashari; Dedik Budianta; Dedi Setiabudidaya
Jurnal Penelitian Sains Vol 17, No 2 (2015)
Publisher : Faculty of Mathtmatics and Natural Sciences

Air limpasan dari aktivitas pertambangan batubara sangat berpotensi pada pembentukan air asam tambang. Air asam tambang yang berasal dari mine sump area tambang Air Laya PT. Bukit Asam (Persero), Tbk. mempunyai nilai pH rendah yaitu berkisar dari 3 sampai 5, kondisi ini akan melarutkan unsur-unsur logam seperti Fe dan Mn pada batuan yang dilalui oleh air asam tambang tersebut. Elektrokoagulasi merupakan metode untuk melakukan proses koagulasi dengan menggunakan tegangan listrik searah yang didasarkan pada peristiwa elektrokimia. Penelitian dilakukan dengan sistem batch skala laboratorium yaitu menggunakan volume air asam tambang 1,8 L, elektroda besi (Fe) 8 cm x 11 cm x 0,8 mm sebanyak 3 lempeng sebagai katoda dan elektroda aluminium (Al) 8 cm x 11 cm x 0,8 mm sebanyak 3 lempeng sebagai anoda. Percobaan dilakukan dengan interval waktu 15 menit, 30 menit, 45 menit dan 60 menit, lalu menggunakan tegangan 6 V, 12 V, dan 24 V untuk jarak elektroda yaitu 1,5 cm dan 2 cm. Dengan tetap mempertimbangkan faktor ekonomi maka diketahui waktu, jarak dan tegangan DC yang paling efektif digunakan untuk proses elektrokoagulasi adalah 12 Volt dan 45 menit yang akan menghasilkan persen peningkatan nilai pH = 32,96 ; persen penurunan logam Fe = 94,0111 ; dan persen penurunan logam Mn = 88,2878, akan tetapi faktor jarak antara elektroda tidak berpengaruh pada proses ini.

Validasi Areal Terbakar dengan Metode Normalized Burning Ratio Menggunkan UAV (Unmanned Aerial Vehicle): Studi Kasus Agus Dwi Saputra; Dedi Setiabudidaya; Dwi Setyawan; Iskhaq Iskandar
Jurnal Penelitian Sains Vol 19, No 2 (2017)
Publisher : Faculty of Mathtmatics and Natural Sciences

Kebakaran hutan merupakan suatu bentuk bencana yang di picu oleh faktor alam maupun faktor kelalaian ma-nusia, bencana ini mempunyai dampak terhadap aspek-aspek kehidupan masyarakat. Salah satu dampaknya adalah de-gradasi hutan dan lahan terutama keanekaragaman hayati didalamnya. Untuk dapat menyusun rencana rehabilitasi pasca kebakaran pada wilayah yang luas dibutuhkan data area terbakar yang sudah terklasifikasi tingkat keparahan terbakarnya. Pada penelitian ini akan melakukan validasi tingkat keparahan terbakar pada kebakaran tahun 2015 di kawasan hutan gambut Merang-Kepayang. Data areal terbakar diturunkan dengan metoda Normalized Burning Ratio dari Citra Landsat 8 yang menggunakan kanal Near Infra Red (NIR) dan kanal Short Wave Infra Red (SWIR), dari perhitungan metoda NBR dihasilkan nilai ambang batas keparahan terbakar yang diklasifikasikan berdasarkan rentang nilai reflektansi yaitu unburned bernilai -1.02 - 0.29 μm, low bernilai 0.29 - 0.42 μm, moderate bernilai 0.42 - 0.55 μm, dan moderate extreme 0.55 - 0.80 μm. Setelah dilakukan klasifikasi tingat keparahan terbakar, kemudian dilakukan validasi hasil klasifikasi menggunakan foto udara dari Unmanned Aerial Vehicle (UAV) dengan 31 titik pengamatan lapangan dengan ketinggian terbang rata-rata 100 m dari permukaan tanah. Validasi menggunakan confusion matrix antara nilai reflektansi dan klasi-fikasi visual foto udara. Hasil validasi menyatakan bahwa akurasi keseluruhan adalah 70.97 % artinya tidak ditemukan perbedaan yang signifikan antara nilai indeks NBR dan klasifikasi lapangan. Dan juga nilai Koefisen Kappa 0.59 yang berarti hasil klasifikasi tersebut mampu mampu menghindari 59.2% kesalahan yang akan muncul pada klasifikasi lapangan.

Jupyter Notebook App: Alternatif Teknologi Pembelajaran Fisika Berbasis Web Browser Dedi Setiabudidaya
Annual Research Seminar (ARS) Vol 1, No 1 (2015)
Publisher : Annual Research Seminar (ARS)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Dalam beberapa dekade ke belakang, perangkat keras dan perangkat lunak komputer mengalami perkembangan yang sangat cepat. Bagi sebagian besar pemerhati sejarah ilmu pengetahuan, perkembangan yang sangat cepat ini memposisikan komputasi sebagai pilar ketiga dari sains setelah teori dan eksperimen. Sebagai contoh, Perez dan Granger (2007) menciptakan aplikasi IPython Notebook berbasis web browser yang telah digunakan oleh banyak orang di bidang pendidikan dan penelitian. Aplikasi ini kini telah bertransformasi menjadi Jupyter Notebook App, dengan menggunakan bahasa pemograman utama yang lebih beragam, yaitu Julia, Python dan R. Shen (2014) memperkirakan satu juta peneliti dan pendidik telah menggunakan aplikasi ini untuk menunjang kegiatan profesinya. Makalah ini membahas pemanfaatan Jupyter Notebook App sebagai teknologi pembelajaran fisika khususnya di bidang fisika bumi dan fisika bahan dengan menggunakan bahasa pemograman python. Hasil survey terbaru menunjukkan bahwa Python kini telah menjadi bahasa pemograman favorit di beberapa perguruan tinggi ternama di Amerika Serikat (Guo, 2014).

On the Influence of Enso And IOD on Rainfall Variability Over The Musi Basin, South Sumatra Wijaya Mardiansyah; Dedi Setiabudidaya; M. Yusup Nur Khakim; Indra Yustian; Zulkifli Dahlan; Iskhaq Iskandar
Science and Technology Indonesia Vol. 3 No. 4 (2018): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

The southern Sumatera region experiences one rainy season and one dry season in a year associated with seasonal change in monsoonal winds. The peak of rainy season is occurring in November-December-January during the northwest monsoon season, while the dry season comes in June-July-August during the southeast monsoon season. This study is designed to evaluate possible influence of the coupled ocean-atmospheric modes in the tropical Indo-Pacific region, namely the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) on the rainfall variability over the catchment area of the Music Basin, South Sumatera. The ENSO and IOD occurrences were reflected by the variability of sea surface temperature (SST) in the tropical Pacific and Indian Ocean, respectively. During El Niño and/or positive IOD episode, negative SST anomalies cover the eastern tropical Indian Ocean and western tropical Pacific including the Indonesian seas, leading to suppress convective activities that result in reduce precipitation over the maritime continent. The situation is reversed during La Niña and/or negative IOD event. The results revealed that the high topography area (e.g. Bukit Barisan) was shown to be instrumental to the pattern of rainfall variability. During the 2010 negative IOD co-occurring with La Niña event, the rainfall was significantly increase over the region. This excess rainfall was associated with warm SST anomaly over the eastern tropical Indian Ocean and the Indonesian seas. On the other hand, extreme drought event tends to occur during the 2015 positive IOD simultaneously with the occurrence of the El Niño events Investigation on the SST patterns revealed that cold SST anomalies covered the Indonesian seas during the peak phase of the 2015 positive IOD and El Niño event.

Simulated Interannual Modulation of Intraseasonal Kelvin Waves in the Equatorial Indian Ocean Iskhaq Iskandar; Dedi Setiabudidaya; Wijaya Mardiansyah; Muhammad Irfan
Journal of Mathematical and Fundamental Sciences Vol. 48 No. 3 (2016)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2016.48.3.3

Outputs from a high-resolution ocean general circulation model (OGCM) for the period of 1990-2003 indicate an interannual modulation of intraseasonal Kelvin waves along the equatorial Indian Ocean. During normal conditions without IOD event, the first mode explains about 30-40% of the total variance in the western (60-65ºE) and central (75-80ºE) basin, while the second mode contributes up to 45% to the total variance in the central basin around the longitude of 82ºE. In contrast, during the 1997/98 IOD event, the fourth mode caused about 40% of the total variance in the central and eastern basin. During the 1994 IOD event, the contribution from the fourth baroclinic mode in the eastern basin caused 45% of the total variance. In the central basin, the second and the fourth baroclinic mode caused almost the same variance (~40%). The variations in the characteristics of the intraseasonal Kelvin waves are related to variations in the vertical stratification. During the IOD event, the pycnocline in the eastern basin was raised by about 50 m and the stratification at the upper level is strengthened, while it is weakened at lower levels. These changes lead to an increase in the contribution of higher-order baroclinic modes.

INDENTIFYING PATTERNS OF SATTELITE IMAGERY USING AN ARTIFICIAL NEURAL NETWORK Iskhaq Iskandar; Azhar Affandi; Dedi Setiabudidaya; Muhammad Irfan; Wijaya Mardiansyah; Fadli Syamsuddin
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 9, No 1 (2012)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

An artificial neural network analysis based on the self-organizing map (SOM) was used to examine patterns of satellite imagery. This study used 3 × 4 SOM array to extract patterns of satellite-observed chlorophyll-a (chl-a) along the southern coast of the Lesser Sunda Islands from 1998 to 2006. The analyses indicated two characteristic spatial patterns, namely the northwest and the southeast monsoon patterns. The northwest monsoon pattern was characterized by a low chl-a concentration. In contrast, the southeast monsoon pattern was indicated by a high chl-a distributed along the southern coast of the Lesser Sunda Islands. Furthermore, this study demonstrated that the seasonal variations of those two patterns were related to the variations of winds and sea surface temperature (SST). The winds were predominantly southeasterly (northwesterly) during southeast (northwest) monsoon, drived offshore (onshore) Ekman transport and produced upwelling (downwelling) along the southern coasts of the Lesser Sunda Islands. Consequently, upwelling reduce dSST and helped replenish the surface water nutrients, thus supporting high chl-a concentration. Finally, this study demonstrated that the SOM method was very useful for the identifications of patterns in various satellite imageries.

Co-Authors - Jumingan, - Affandi, Azhar Kholiq Agus Dwi Saputra Aldes Lebani, Aldes Aldes Lesbani Aldri Frinaldi Alfahidayah, Arini Alfikro, Ihsan Amiruddin Supu Aniendita Ningtyas Armanto, M Edi Arsyad, Fitri Suryani Ashari Ashari Assaidah, Assaidah Azhar Affandi Balada Soerya Dedik Budianta Dwi Setyawan Elisa Wildayana Fitri Suryani Arsyad Harisdianto, Harisdianto Husin, Sadam Idha Royani Indra Yustian Irma Suryani Iskhaq Iskandar Ismail, Dede Ridwan Jaya Edianta Jumingan Jumingan Khairul Saleh Liasari, Beta Riana Moamar Aprilian Ghadafi Mokhamad Yusup Nur Khakim Muhammad Irfan Muhammad Taufik Toha Muhammad Taufik Toha Ngudiantoro . Nur’aini, Siti Octavianus Cakra Satya Rakhmawati Farma Risfidian Mohadi Siti Lailaturofi'ah Siti Sailah, Siti Soerya, Balada Weanda, W Wijaya Mardiansyah Wijaya Mardiansyah Wijaya Mardiansyah Wijaya Mardiansyah Wijaya Mardiansyah, Wijaya Zuhdi, Mohd Zulkifli Dahlan Zulkifli Dahlan

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