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All Journal Indonesian Journal of Geography Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Infinity Tadris: Jurnal keguruan dan Ilmu Tarbiyah JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Forum Geografi Jurnal Penelitian dan Pembelajaran IPA Indonesian Journal of Science and Technology Journal of Natural Sciences and Mathematics Research Al-Jabar : Jurnal Pendidikan Matematika JIPF (Jurnal Ilmu Pendidikan Fisika) PRISMA Desimal: Jurnal Matematika Jurnal Pertahanan : Media Informasi tentang Kajian dan Strategi Pertahanan yang Mengedepankan Identity, Nasionalism dan Integrity JTAM (Jurnal Teori dan Aplikasi Matematika) International Journal of Supply Chain Management Andalasian International Journal of Agricultural and Natural Sciences International Journal of Electronics and Communications Systems

Umam, Rofiqul

Kwansei Gakuin University

Author-ID : 2525555

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Social Sciences Transportation Other

Published : 24 Documents Claim Missing Document

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Articles

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Optimization and Interpretation of Heat Distribution in Sterilization Room Using Convection Pipe Abdurrahman, Abdurrahman; Umam, Rofiqul; Irzaman, Irzaman; Palupi, Endah Kinarya; Saregar, Antomi; Syazali, Muhamad; Junaidi, Rahmad; Wahyudianto, Benny; Adi, Langit Cahya
Indonesian Journal of Science and Technology Vol 4, No 2 (2019): IJOST: VOLUME 4, ISSUE 2, 2019
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v4i2.18177

In mushroom cultivation of white oyster mushroom (P. ostreatus), problems in the contamination during the production are typically found. This contamination is due to the issue in controlling temperature during the media sterilization for growing the fungus (bag-log). This suboptimal sterilization causes unwanted bacteria and spores to grow. To reduce the amount of contamination, the purpose of this study was to demonstrate and evaluate the temperature distribution using one convection pipe with diameter of 6 and 8 cm. The fuel used for this sterilization process is rice husk. Sterilization itself aims to kill other unwanted bacteria and spores on the bag-log. Sterilization was done by traditional steaming bag-log drums arranged in four rows upwards for 6 hours. Convection pipes were built in drums. The steamer was done by performing two retrievals of data. From the experiment results, the use of convection pipe of 8 cm was better than the convection pipe of 6 cm. This is shown from the amount of fungal contamination in convection pipes were less in 8. The result of temperature measurement using dual laser infrared thermometer was also completed and interpreted using Matrix Laboratory with interpolation method to get heat distribution result.

Utilization of Stem Bark and Leaves of Kluwih (Artocarpus Altilis Park) as an Anti-Mosquito Repellent: A Case Study of Total Mosquito Mortality (Anopheles Sp) Kurniawan, Betta; Puspita, Laila; Kurnia, Yogi; Husna, Ismalia; Rahmat, Ali; Umam, Rofiqul; Andriana, Bibin B.; Jermsittiparsert, Kittisak
Indonesian Journal of Science and Technology Vol 5, No 3 (2020): IJOST: VOLUME 5, ISSUE 3, 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v5i3.25370

The purpose of this study was to demonstrate an alternative solution as an insecticide from Indonesian natural ingredients. We investigated the potential use of Artocarpus altilis park (known as kluwih plants in Indonesia) for an anti-mosquito repellent because it contains flavonoids and saponins. The use of this type of insecticide is harmless, inexpensive, and largely available in Indonesia. In the experiment, we extracted bark and leaves of kluwih to obtain insecticidal material to repel Anopheles sp. To ensure the precise extraction and insecticidial effect, the experiments were conducted four times with three repetitions. For each experiment, we used 8.4 mL with the concentrations of 20, 30, and 40% of flavonoid. The results showed that the higher the concentrations of bark and leaf extracts of Artocarpus altilis park the higher the mortality rate of Anopheles sp is.

Management System of Education: Conceptual Similarity (Integration) between Japanese Learning System and Islamic Learning System in Indonesia Munifah Munifah; Iskandar Tsani; Muhamad Yasin; Hasan Said Tortop; Endah Kinarya Palupi; Rofiqul Umam
Tadris: Jurnal Keguruan dan Ilmu Tarbiyah Vol 4, No 2 (2019): Tadris: Jurnal Keguruan dan Ilmu Tarbiyah
Publisher : Universitas Islam Negeri Raden Intan Lampung

The changing times that followed the development of technology made the education system management must be updated to suit the needs and conditions of the environment. In this article, we look for information about the education system in two different countries, namely Japan and Indonesia. The purpose of this research is to find out the integration between the two countries that have different education management systems. The research method used is a descriptive qualitative method. In this research also, the research method is based on the philosophy of postpositivism, using natural conditions or objects. The instrument used to find out information on the education system in each school uses 10 questions and looks for curriculum information data in general in each country. The findings in this study found that, although the management of the education systems of the two countries was slightly different, Indonesian students could compete to continue their tertiary education to developed countries. Besides, the education system in Japan does not make students from Indonesia experience difficulties.

Identification of Slip Surfaces Using the Geoelectric Imaging Method in the Kalirejo Area, Kokap District, Yogyakarta, Indonesia Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
JIPF (Jurnal Ilmu Pendidikan Fisika) Vol 6, No 3 (2021): September 2021
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jipf.v6i3.2072

Landslides are a significant threat to the environment, infrastructure, and human activity, especially in mountainous and hilly areas. It is, therefore, important to accurately identify the social movements that trigger these processes. The resistivity method can investigate subsurface geological variations, including the potential for landslides. This research was conducted to investigate the subsurface structures in the Kalirejo Village area, Kokap District, Kulon Progo Regency, Yogyakarta regarding identifying the sliding location. This investigation includes five lines of tomographic geoelectric measurements. The results show that the slips surface is at a depth of about 5-10 m with a high resistivity value and the landslide material is weathered soil, and the slip surface is andesite. The resistivity of andesite in range 668-1600 Ωm. The landslide material's thickness is around 5-8 m with resistivity in the range 4,01-22.1 Ωm. Landslide material is water-saturated soil.

Intensity level as sustainable energy: Analysis of the conversion of energy stored on cicadas sound waves Rofiqul Umam; Endah Kinarya Palupi; Khusnul Yakin; Mochamad Iqbal; Rahmat Nawi Siregar; Irzaman Irzaman
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 10, No 2 (2021): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

In this study, the researchers measured cicadas' sound waves, considering that cicadas are mostly found in rural areas. The intensity level meter (AMTAST AMF003) was used with time variations (9:00 JST; 12:00 JST; and 15:00 JST). Measurements of air temperature differences (Krisbow Temperature Humidity Data Logger) were also carried out, and weather conditions were also considered in data collection using satellite data from Himawari, Japan. The interpretation results of intensity level's trend measured at 3:00 pm JST were decreased concerning the changes in days. Meanwhile, the measurement at 09:00 am and 12:00 pm JST did not show a decrement concerning the changes in days (31 days in total). These results show that temperature changes (towards autumn) can affect the intensity level of sound waves. In addition, slightly different intensity levels can affect large changes in acoustic power or the produced sound.

Investigation of the distribution and Fe content of iron sand at Wari Ino beach Tobelo using resistivity method with werner-schlumberger configuration Bayu Achil Sadjab; I Putu Tedy Indrayana; Steven Iwamony; Rofiqul Umam
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 9, No 1 (2020): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

This research aimed to investigate the distribution, volume, and concentration of iron sand at Wari Ino Beach Tobelo. The resistivity method with Werner-Schlumberger configuration was applied to investigate the iron sand distribution. The measurements were set-up on 3 lines that run parallel along the coast of Wari Ino Village. The length of each trajectory was 150 meters with a spacing of 10 meters for each electrode. Data acquisition was carried out by using geoelectric instruments to obtain current injection (I) and voltage (V). The analysis was carried out by using RES2DINV and ROCKWORK software to obtain 2-D and 3-D cross-section models for interpreting the distribution and volume of the iron sand. The analysis and interpretation were supported by geological data of the location. Furthermore, the Fe content was characterized by using X-Ray Fluorescence Spectroscopy (XRF). There results show that the volume of the iron sand in each trajectory was 109,355 m3; 180,254 m3; and 120,556 m3. The total volume of iron sand along the three trajectories was up to 405,335 m3. The Fe content in the form of a free element is 67.41%, 57.12%, and 73.40%. The Fe content in the form of hematite mineral (Fe2O3) was 57.92%, 45.82%, and 65.47%.

3D Modeling of Subsurface Lawanopo Fault In Southeast Sulawesi, Indonesia Using Grablox and its Consequence to Geohazard Triani Triani; Rofiqul Umam; Sismanto Sismanto
Indonesian Journal of Geography Vol 53, No 1 (2021): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.50878

Lawanopo Fault is a horizontal shear fault (sinistral strike-slip) found in Southeast Sulawesi province and is thought to be active during Plio-Pleistocene or mid-late Miocene to the present. This study has been carried out which aims to find out the geometric shapes below the surface of the Lawanopo fault using complete Bouguer anomaly (ABL) data. The ABL data is projected onto a flat plane using the Dampney method at an altitude of 8 km, and the separation of local and regional anomalies is carried out using the upward continuation method at an altitude of 60 km. Three-dimensional (3D) modeling under the surface of the Lawanopo fault is done using the computer program Grablox. Data processing techniques using Singular Value Decomposition (SVD) and Occam inversion. The results showed that a high gravity anomaly of 190-225 mGal was caused by an igneous rock below the surface with a density of 2.7-3.33 gr/cm3 and a thickness of about 13 km, a moderate anomaly of 175-187 mGal caused by Paleozoic igneous rocks aged Carbon with a density of 2.6-2.9 gr/cm3 and a thickness of about 25 km. Low anomaly 115-160 mGal is caused by rocks with a density of 2.0-2.5 gr/cm3 and a thickness of about 22-23 km. The Lawanopo fault constituent rocks consist of alkaline rocks in the basement covered by sediment and metamorphic with a depth of Lawanopo fault more than 15 km and begin to be seen at a depth of 4.3 km of the surface. it is known that the area around the Lawanopo fault is an area prone to earthquakes. But, based on the soil and rock structure around the Lawanopo fault, the compactness and attenuation levels in reducing earthquake waves are quite good, so that land use around the Lawanopo fault tends to be safe.

Identification of Andesite Resource Potential In Kalirejo Area, Kokap Sub-District, Kulon Progo Using Resistivity Method Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
Forum Geografi Vol 35, No 1 (2021): July 2021
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v35i1.13507

In the last five years, the need for materials to build infrastructure in Kulon Progo Regency has increased with the construction of an international airport. In the construction process, strong earth or rock materials are needed to make buildings resistant to earthquakes, one of which is andesite rock. This study aims to determine andesite rocks' resources using a three-dimensional model based on the value of resistivity in Kalirejo district Kokap Kulon Progo. The research was conducted by geological and geophysical survey. Based on data on the distribution of rocks in the research area included in the intermediate igneous rocks, andesite. These rocks are intrusions that develop in research areas. Petrography analysis is used to determine the types of minerals in andesite rocks and determine which levels of rock changes have changed or not to affect the strength of rocks. These rocks are intrusions that develop in research areas. Geophysical survey is by resistivity method using configuration dipole-dipole with five lines, and each stretch is 200 m. Based on three-dimensional model resistivity, fresh andesite is at a depth of between 5-10 m. Value of andesite resistivity is more than 668 Î©m, while the value of weathered andesite resistivity ranges from 256-536 Î©m and andesite resources about 332,580 tons.

Physics Learning through Active Learning Based Interactive Conceptual Instructions (ALBICI) to Improve Critical Thinking Ability Rahma Diani; Irwandani Irwandani; Al-Hijrah Al-Hijrah; Yetri Yetri; Dwi Fujiani; Niken Sri Hartati; Rofiqul Umam
Jurnal Penelitian dan Pembelajaran IPA Vol 5, No 1 (2019): Available Online in May 2019 (Web of Science Indexed)
Publisher : Department of Science Education, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/jppi.v5i1.3469

The process of physics learning in MAN (Islamic senior high school) 2 Bandar Lampung which is still teacher-centered causes students to have low critical thinking skills. One learning model that can be used to overcome this problem is the Active Learning Based Interactive Conceptual Instructions (ALBICI) model which is equipped with Predict, Discuss, Explain, Observe, Discuss, Explore, Explain Tasks (PDEODE*E tasks). The purpose of this study is to determine the effectiveness of the ALBICI model with PDEODE*E tasks in improving students’ critical thinking skills on momentum and impulses subject material. The type of research used is quasi-experimental with 30 students of the class X1 as the experimental class and 30 students of class X2 as the control class. The results of data analysis using t-test at a significance level of 0.05 indicate that the ALBICI model with PDEODE*E tasks iseffective in improving students’ critical thinking skills. Furthermore, theobtainedeffect size of 0.6 indicates that the model's effectiveness falls into the medium category.

Search, Solve, Create, and Share (SSCS) Learning Model: The Impact on the Students Creative Problem-Solving Ability on the Concept of Substance Pressure Rahma Diani; Hesti Herliantari; Irwandani Irwandani; Antomi Saregar; Rofiqul Umam
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 9 No. 1 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n1.p65-77

This study aimed to determine the effectiveness of the Search, Solve, Create, and Share (SSCS) learning model and its impact on the students creative problem-solving ability. The study was conducted on eighth-grade students of Junior High School 24 (SMPN 24) Bandar Lampung, Indonesia, on the Substances Pressure subject matter. This is quasi-experimental with non-equivalent control group design. The independent sample t-test showed that the SSCS model influences the students creative problem-solving ability, of which the experimental class is higher than the control class. Furthermore, the results of the effect size obtained the d value of 2.39, indicating the SSCS learning model is effective for the students' creative problem-solving ability which belongs to the high category.

Co-Authors Abd. Rasyid Syamsuri Abdul Mutolib Abdurahman Abdurrahman Adi, Langit Cahya Al-Hijrah Al-Hijrah Alhamdy Adytama Ali Rahmat Ali Rahmat Andika Eko Prasetiyo Andriana, Bibin B. Annisa Nurhuda Romadhona Antomi Saregar Bayu A. Sadjab Belista Gunawan Betta Kurniawan, Betta Bonno Andri Wibowo Dewi Lengkana Dwi Fujiani Endah Kinarya Palupi Endah Kinarya Palupi Endah Kinarya Palupi Endah Kinarya Palupi Fajri Mulya Iresha Fitria Lestari Fredi Ganda Putra Hasan Said Tortop Hasan Said Tortop Hasan Said Tortop Hesti Herliantari Hurien Helmi Husna, Ismalia I Putu Tedy Indrayana Ikhsan Maulidi Ilma Ridhona Irwandani Irwandani Irzaman, Irzaman Iskandar Tsani Jermsittiparsert, Kittisak Kasam Kasam Khoirunnisa Imama Khusnul Yakin Kittisak Jermsittiparsert Kurnia, Yogi Laila Puspita, Laila Lusi Anggraini Mada Sanjaya WS Mochamad Iqbal Muawanah Muawanah Muhamad Syazali, Muhamad Muhamad Yasin Muhammad Nafian Munifah Munifah Nanda Ridki Permana Niken Sri Hartati Nurhanurawati Nurhanurawati Obrin Trianda Obrin Trianda Palupi, Endah Kinarya Rahma Diani Rahmad Junaidi Rahmad Junaidi Rahmad Junaidi, Rahmad Rahmi Ramadhani Rasdiana, Felga Zulfia Rika Rahmawati Rizka Dwi Saputri Rizqi Prastowo Santi Widyawati Siregar, Rahmat Nawi Sismanto Sismanto Steven Iwamony Sugeng Sutiarso Suparman Suparman Syamsul Huda Syamsul Huda Triani Triani Vina Apriliani Wahyudianto, Benny Yetri Yetri Yudha Satya Perkasa Zakir Sabara

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