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All Journal Journal of Mathematical and Fundamental Sciences Conciencia Science and Technology Indonesia Jurnal Penelitian Sains Jurnal Penelitian Pendidikan IPA (JPPIPA) International Journal of Remote Sensing and Earth Sciences (IJReSES)

Muhammad Irfan

Jurusan Fisika, Universitas Sriwijaya

Author-ID : 2484276

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences

Published : 11 Documents Claim Missing Document

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Analisis Terhadap Data Klimatologi untuk Menentukan Jenis Iklim Kota Palembang Menggunakan Metode Thornthwaite Muhammad Irfan; Arsali Arsali; Fera Lusiana
Jurnal Penelitian Sains No 18 (2005)
Publisher : Faculty of Mathtmatics and Natural Sciences

Telah dilakukan penelitian untuk menentukan jenis iklim kota Palembang menggunakan metode thornthwaite. Meode ini memerlukan data klimatologi berupa data temperatur dan endapan hujan (presipitasi). Data yang digunakan pada penelitian ini adalah data temperatur rata-rata bulanan dan data presipitasi rata-rata bulanan kota Palembang selama periode tahun 1972-2002. Pada prinsipnya metode ini menganalisis hubungan antara presipitasi, penguapan dan temperatur di suatu daerah sehingga didapatkan jenis iklim di daerah tersebut. Hasil penelitian ini menunjukkan bahwa iklim kota Palembang termasuk region kelembaban basah dan region termal tropikal.

Analisis Terhadap Relasi Empirik Antara Konduktivitas Panas Dengan Kecepatan Gelombang Elastik-P pada Batuan Beku Muhammad Irfan
Jurnal Penelitian Sains No 8 (2000)
Publisher : Faculty of Mathtmatics and Natural Sciences

Tulisan ini memaparkan penelitian yang bertujuan mencari hubungan empirik antara konduktivitas panas dengan kecepatan perambatan gelombang elastik-P untuk suatu sampel batuan beku. Penentuan hubungan kedua parameter tersebut dilakukan melalui eksperimen di laboratorium dan penghitungan secara statistik. Hasilnya menunjukkan bahwa kedua parameter tersebut mempunyai relasi linier yang signifikan.

Penentuan Metoda Pengukuran Bobot Isi Tanah Terbaik Berdasarkan Korelasi Antara Bobot Isi Basah dan Bobot Isi Kering Yang Terukur Muhammad Irfan; Frinsyah Virgo; Aniza Aniza
Jurnal Penelitian Sains No 15 (2004)
Publisher : Faculty of Mathtmatics and Natural Sciences

Bobot isi tanah merupakan salah satu parameter penting yang digunakan untuk menghitung kemampuan suatu lereng. Bobot isi tanah terdiri atas bobot isi basah dan bobot isi kering. Ada tiga metoda untuk mengukur bobot sis nasah dan bobot isi kering tanah yaitu metoda mould, metoda parafin wax dan metoda graduated cylinder. Pengukuran bobot isi basah dapat dilakukan dengan mudah di laboratorium dengan menggunakan sampel tanah langsung dari lapangan. Namun untuk penentuan bobot idi kering, sampel harus mengalami proses pengeringan yang tepat sehingga kadar air yang dikandung menjadi seminimal mungkin. Sampai saat ini belum ada penelitian tantang metoda mana yang terbaik jika ditinjau dari korelasi antara bobot isi basah dan bobot isi kering yang terukur. Penelitian ini bertujuan menentukan metoda mana yang terbaik jika ditinjau dari korelasi tersebut. Hasil penelitian ini menunjukkan bahwa metoda yang terbaik adalah metoda parafin wax.

Penentuan Hubungan Empirik Antara Konduktivitas Panas dengan Kecepatan Gelombang Elastik-P pada Batuan Vulkanik Muhammad Irfan
Jurnal Penelitian Sains No 6 (1999)
Publisher : Faculty of Mathtmatics and Natural Sciences

Penelitian ini bertujuan mencari hubungan empirik antara konduktivitas panas dengan kecepatan perambatan gelombang elastik-P untuk suatu sampel batuan vulkanik. Penentuan hubungan kedua parameter tersebut dilakukan melalui eksperimen di laboratorium dan penghitungan secara statistik. Hasilnya menunjukkan bahwa kedua parameter tersebut mempunya relasi linear yang signifikan.

ABILITY TO READ QURAN AND UNDERSTANDING OF TAJWID FOR SRIWIJAYA UNIVERSITY STUDENTS Sri Safrina; Muhammad Irfan
Conciencia Vol 20 No 2 (2020): Conciencia
Publisher : Pascasarjana Universitas Islam Negeri Raden Fatah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/conciencia.v20i2.6486

The ability to read the Al Quran and understanding the tajwid are two things that cannot be separated. Good reading skills without understanding the knowledge of tajwid will make the reading misleading. This study aims to determine the ability to read AlQuran, the ability to understand tajwid, and the correlation between these two variables in Sriwijaya University students. This research data was taken from 100 new Sriwijaya University students in 2019 and analyzed using statistical methods. The results of this study indicate that the majority of Sriwijaya University new students (42%) have reading skills in the range of 64-71 values and the majority of mastery of tajwid (36%) in the range of values 56-63. The results of this study also indicate that there was a significant correlation between the mastery of tajwid and the ability to read AlQuran with a correlation coefficient (r) of 0.98.

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.

TREND IN PRECIPITATION OVER SUMATERA UNDER THE WARMING EARTH Iskhaq Iskandar; Muhammad Irfan; Fadli Syamsuddin; Akmal Johan; Pradanto Poerwono
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 8, (2011)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

A long-term climate variations in the western Indonesian region (e.g. Sumatera) were evaluated using precipitation data as a proxy. The result showed that there was a long-term climate variation over Sumatera region indicated by a decreasing trend in precipitation (drying trend). Moreover, the long-term precipitation trend has a strong seasonality. Remarkable decreasing trend at a rate of 3.9 cm/year (the largest trend) was observed during the northwest monsoon (DJF) season, while the smallest decreasing trend of 1.5 cm/year occurred during the southeast monsoon (JJA) season. This result suggested that the Sumatera Island experienced a drying trend during the northwest monsoon season, and a dryer condition will be more frequently observed during the southeast monsoon season. The long-term precipitation over the Sumatera Island was linked to coupled air-sea interactions in the Indian and Pacific oceans. The connection between the seasonal climate trends and sea surface temperature (SST) in the Indian and Pacific oceans was demonstrated by the simultaneous correlations between the climate indices (e.g. Dipole Mode Index (DMI) and the Niño3.4 index) and the precipitation over the Sumatera Island. The results suggested that both the Indian Ocean Dipole (IOD) and the El Niño-Southern Oscillation Index (ENSO) have significant correlation with precipitation. However, remarkable correlations were observed during the fall transition of the IOD event. Keywords: Climate variations, Dry season, Precipitation, Sumatera and Kalimantan, Wet season.

Characteristics of Diurnal Rainfall over Peatland Area of South Sumatra, Indonesia Puad Maulana Mandailing; Wijaya Mardiansyah; Muhammad Irfan; Arsali Arsali; Iskhaq Iskandar
Science and Technology Indonesia Vol. 5 No. 4 (2020): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

The peak time of rainfall occurrence over an area has certain characteristics in which the difference in time and intensity of rainfall varies depending on its location and distance from the sea. This variation can be determined based on the phase and amplitude obtained using harmonic analysis. In this study, combined data from in-situ observation, satellite remote sensing and reanalysis were used to analyze spatial and temporal variations of peak rainfall events over peatland area of the South Sumatra Province. The results show that most of the South Sumatra Province has a diurnal peak of rainfall during afternoon ranging from 16.00 to 19.00 Western Indonesian Time. In addition, the results also indicate that the analysis on the in situ data revealed seasonal variation both in amplitude and time of maximum diurnal rainfall, while the reanalysis data only indicated a weak seasonal variation on the amplitude of the diurnal rainfall. Furthermore, spatial analysis shows that the time of maximum diurnal rainfall has spatial variation. Over the ocean, the time of maximum diurnal rainfall occurs during night time/early morning. Over the lowland or coastal area, the time of maximum diurnal rainfall occurs during afternoon, while over the high altitude (mountain) it occurs during late night.

El NiÃ±o Southern Oscillation (ENSO), Indian Ocean Dipole (IOD), and the Rise of Extreme Temperatures in Eastern Sumatra: Exploring Climate Change Dynamics Hamdi Akhsan; Muhammad Irfan; Iskhaq Iskandar
Jurnal Penelitian Pendidikan IPA Vol. 9 No. 2 (2023): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i2.3084

The Indonesian region is affected by the monsoon system, which leads to a rainy season in December-March and a dry season in June-September. Global warming caused by human activities is increasing the risk of extreme climate events like floods, droughts, etc. The study aims to analyze the trends and correlations of extreme temperatures in the South Sumatra coastal area and its relationship with the DMI and Nino 3.4 indices. The four-stage research methodology includes data collection, extreme temperature index calculation, trend detection and correlation analysis with ENSO. Results indicate that the region has seen a rise in temperature, with hot day/night temperatures increasing by 0.26-0.29Â°C per decade and cold day/night temperatures by 2-3Â°C per 100-1000 years. A strong correlation was found between the DMI index and daily maximum/minimum temperatures, as well as between the Nino 3.4 index and the Diurnal Temperature Range (DTR). The study projects that nighttime temperatures will increase faster than daytime temperatures in the future, with a proportional correlation between the Nino 3.4 index and extreme temperatures

Co-Authors Akmal Johan Aniza Aniza Arsali Arsali Arsali Arsali Azhar Affandi Azhar Kholiq Affandi Dedi Setiabudidaya Fadli Syamsuddin Fera Lusiana Frinsyah Virgo Hadi Hadi Hamdi akhsan, Hamdi Iskhaq Iskandar Lidia Novianti Octavianus Cakra Satya Pradanto Poerwono Puad Maulana Mandailing Sri Safrina Sri Safrina Wijaya Mardiansyah Wijaya Mardiansyah

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