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All Journal Prosiding Pendidikan Sains BUMI: International Journal of Environmental Reviews Tropical Marine Environmental Sciences
Latifah Nurul Qomariyatuzzamzami
Departemen Fisika, Institut Teknologi Bandung, Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Environmental Science Physics

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METODE NUMERIK PADA RANGKAIAN RLC SERI MENGGUNAKAN VBA EXCEL Qomariyatuzzamzami, Latifah Nurul; Kurniasih, Neny -
Prosiding Seminar Nasional Pendidikan Sains FKIP UNS Vol 1, No 1 (2014): Seminar Nasional Pendidikan Sains IV (SNPS IV 2014)
Publisher : Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (33.496 KB)

Abstract

Telah dirancang program dengan menggunakan VBA Excel untuk menentukan nilai tegangan resistor, induktor, dan kapasitor rangkaian RLC seri dengan metode numerik dan analitik, menggambarkan arus dan tegangan R, L, dan C sebagai fungsi waktu, dan menentukan frekuensi resonansi pada rangkaian RLC seri. Metode numerik yang digunakan adalah metode diferensiasi numerik beda maju untuk menentukan nilai tegangan pada induktor dan metode integrasi numerik kaidah trapesium untuk menentukan nilai tegangan pada kapasitor. Hasilnya dapat disimpulkan bahwa menghitung tegangan pada R, L, dan C dapat dilakukan dengan VBA Excel secara numerik yang hasilnya mendekati perhitungan secara analitik. Arus dan tegangan R, L, dan C sebagai fungsi waktu dapat digambarkan dengan VBA Excel, di mana pada resistor arus sefasa dengan tegangan yang melaluinya, sedangkan pada induktor, arus tertinggal oleh tegangan dengan beda fasa sebesar 90o dan pada kapasitor arus mendahului tegangan dengan beda fasa sebesar 90o. Program dapat digunakan untuk menentukan frekuensi resonansi pada rangkaian RLC seri yang terjadi saat XL=XC, impedansinya Z=R, ditunjukkan dengan grafik hubungan antara arus dan frekuensi dan grafik hubungan antara impedansi dengan frekuensi.  
The flood points distribution in Dibal Village from 2019 to 2023 Iemaaniah, Zuhdiyah Matienatul; Qomariyatuzzamzami, Latifah Nurul; Zamani, Muhammad Zaki
BUMI: International Journal of Environmental Reviews Vol. 1 No. 01 (2023): BUMI: International Journal of Environmental Reviews
Publisher : UIN Sulthan Thaha Saifuddin Jambi, Pusat Kajian Lingungan Hidup

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30631/bumi.v1i01.1902

Abstract

Floods are natural disasters that commonly occur in tropical countries like Indonesia. Floods often happen in low-lying areas densely populated by residents. The amount and intensity of rainfall have a significant impact on the occurrence of floods at specific points. Population growth and urban development have led to rapid construction, reducing areas for rainwater absorption. This study was conducted in Dibal Village, Ngemplak District, Boyolali Regency, which directly borders Surakarta City. The area has three important facilities as supporting facilities for the region. This research aims to determine the distribution and causes of floods in Dibal Village over the past five years.This research utilized spatial data, analyzed qualitatively using a descriptive approach. Research data were obtained from in-depth interviews and presented in a flood distribution map of Dibal Village. The results of this study identified flood points in Beran Hamlet, North Dibal Hamlet, Central Dibal Hamlet, South Dibal Hamlet, and North Wangkis Hamlet. Among these hamlets, the most severely affected by floods is Beran Hamlet, with flood depths ranging from 30-50 cm and a receding time of 5-9 hours. Meanwhile, North Dibal Hamlet experienced flood depths of 10-30 cm with a receding time of 3-7 hours, Central Dibal Hamlet had flood depths of 10-20 cm with a receding time of 3-5 hours, South Dibal Hamlet had flood depths of 15-25 cm with a receding time of 3-5 hours, and North Wangkis Hamlet had flood depths of 10-25 cm with a receding time of 3-9 hours
Analysis of Upwelling Parameters when the El Nino Southern Oscillation (ENSO) Occurred in the Halmahera Sea Marthinus, Libertinus; Avrionesti, Avrionesti; Haryanto, Yosafat Donni; Qomariyatuzzamzami, Latifah Nurul
Tropical Marine Environmental Sciences Vol. 2 No. 2 (2024)
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/tromes.2.02.36-41

Abstract

Upwelling events that occur in the Halmahera Sea are influenced by the El Nino Southern Oscillation (ENSO). Upwelling can cause sea surface temperatures to be lower than normal, affecting the potential of fishery resources in the region. The purpose of this study was to determine the conditions of sea surface temperature, chlorophyll-a content, salinity, and upwelling conditions when viewed from the parameters of chlorophyll-α content and sea surface temperature when El Nino was strong, El Nino was weak, La Nina was strong, and La Nina weak and in normal conditions in the Halmahera Sea region. The data used in this study include the Oceanic Nino Index, sea surface temperature, salinity, and chlorophyll-α content during the 2010–2019 period. A quantitative descriptive research type is used by filtering ENSO data to determine when ENSO occurred, then visualizing the data in each parameter and analyzing it. The results of this study show that upwelling is known to occur in the northern to western parts of the Halmahera Sea. When the El Nino phase is vital, the upwelling parameter changes, the sea surface temperature decreases to 27.1⁰C, the chlorophyll-α content increases to 0.70 mg/m3 compared to the normal phase, and the upwelling intensity changes.
Co-Authors Avrionesti, Avrionesti Haryanto, Yosafat Donni Marthinus, Libertinus Neny - Kurniasih Zamani, Muhammad Zaki Zuhdiyah Matienatul Iemaaniah