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All Journal Mimbar Sekolah Dasar Justek : Jurnal Sains Dan Teknologi ORBITA: Jurnal Pendidikan dan Ilmu Fisika Bulletin of Chemical Reaction Engineering & Catalysis
Algifari, Arif
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Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Education Mathematics Physics

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Analisis Logam Berat Pada Lahan Bekas Tailing Emas Berdasarkan Sifat Fisik Kimia Tanah Yanti, Syari Rahma; Hadiguna, Rika Ampuh; Nauli, Fitri; Algifari, Arif; Cahyadi, Tedy Agung; Ernawati, Rika
Justek : Jurnal Sains dan Teknologi Vol 7, No 2 (2024): Juni
Publisher : Unversitas Muhammadiyah Mataram

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

Abstract

Abstract:  Heavy metals are considered pollutants because its have a toxic effect on an organism if they exceed a certain concentration. The purpose of this study is to determine the characteristics of soil materials based on the physical and chemical properties of the soil. The method used to process the data is using the Soil Chemical Properties Assessment criteria while the texture class is determined based on the Texture Triangle. The result of the physical and chemical properties analysis of the soil is to determine the fertility level of the tailings soil. The analysis was carried out by assessing the physical properties of the soil, namely soil texture, while the assessment of soil chemical properties was soil pH, Cationic Exchange Capacity (CEC), Base Saturation (BS), C-Organic, and metal percentages of Potassium (K), Calcium (Ca), Magnesium (Mg), Sodium (Na). The results of the study showed that the tailings soil had a pH value of 8.89 including the lime category, this was in line with the CEC value and the alkaline saturation was classified as high and very high with values of 31.33% and 94.67 cmol/kg, as well as the values of Potassium (K), Calcium (Ca), Magnesium (Mg), Sodium (Na) which showed very high amounts in the results of the TSF 56 tailings soil testing laboratory. However, the value of C-Organic content is 0.16%, including a very low category. The permeability value of tailings soil is quite low, which is 0.21%, this is in line with the texture of tailings soil which is dominated by clay and dust so that the ability to drain water is very low.Abstrak: Logam berat dianggap sebagai pencemar karena memiliki efek racun pada suatu organisme apabila sudah melebihi konsentrasi tertentu. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik material tanah berdasarkan sifat fisik dan kimia tanah. Metoda yang digunakan untuk mengolah data adalah menggunakan kriteria Penilaian Sifat Kimia Tanah sedangkan kelas tekstur ditentukan berdasarkan motoda Segitiga Tekstur. Hasil dari analisis sifat fisik dan kimia tanah adalah untuk mengetahui tingkat kesuburan tanah tailing. Analisis dilakukan dengan menilai sifat fisika tanah yaitu tekstur tanah, sedangkan penilaian sifat kimia tanah yaitu pH tanah, Kapasitas Tukar Kation (KTK), Kejenuhan Basa (KB), C-Organik, dan persentaase logam Kalium (K), Kalsium (Ca), Magnesium (Mg), Natrium (Na). Hasil penelitian menunjukkan tanah tailing memiliki nilai pH sebesar 8.89 termasuk kategori kalis, hal ini sejalan dengan nilai KTK dan kejenuhan basa tergolong tinggi dan sanggat tinggi dengan nilai 31,33 % dan 94,67 cmol/kg, begitupun dengan nilai Kalium (K), Kalsium (Ca), Magnesium (Mg), Natrium (Na) yang menunjukan jumlah yang sanggat tinggi pada hasil laboratorium pengujian tanah tailing TSF 56. Namun untuk nilai kandungan C-Organik adalah 0.16% termasuk katagori sangat rendah. Untuk nilai permeabilitas tanah tailing cukup rendah yaitu 0.21 %, ini sejalan dengan tesktur tanah tailing yang didominasi oleh liat dan debu sehingga kemampuan melolokan air sangat rendah.
ANALYTICAL CALCULATION FOR LAMINAR AIR FLOW MOMENTUM TRANSPORT IN UNDERGROUND MINE TUNNEL USING NEWTONIAN EQUATIONS OF MOTION Algifari, Arif; Adrian, Adrian
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 9, No 2 (2023): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v9i2.17053

Abstract

ABSTRAKDalam kasus tertentu terdapat terowongan percabangan tambang bawah tanah yang tidak teralirkan udara secara mekanis tetapi udara tetap mengalir secara alami teridentifikasi beraliran laminar. Studi ini memodelkan perpindahan momentum aliran laminar udara terowongan dengan dimensi rectangular atau Cartesian untuk memvisualisasikan profil distribusi kecepatan linier fluida dan profil tegangan geser fluida. Metode pemodelan menggunakan perhitungan analitik matematika dari persamaan gerak aliran fluida Newtonian untuk rejim laminar Navier-Stokes. Beberapa data yang dikumpulkan adalah dimensi terowongan, kecepatan linier udara, dan temperatur. Beberapa sifat fisik udara dikutip dari literatur. Hasil pengukuran kecepatan udara rata-rata diinputkan ke dalam model empiris untuk mendapatkan profil koordinat dua dimensi (x,z) untuk distribusi tegangan geser dan kecepatan udara yang mendekati keadaan sebenarnya untuk aliran laminar pada dimensi Cartesian. Hasil penelitian didapatkan pressure drop aliran sebesar 2,2 x 10-5 Pa, aliran mengandalkan perpindahan molekular bukan perpindahan secara konveksi paksa karena dilihat dari profil sebaran tegangan geser yang terlalu kecil dan laju alir sebesar 0,32 m3/s tidak memenuhi fungsi ventilasi tambang bawah. Kata kunci: perpindahan momentum; aliran laminar; fluida newtonian; ventilasi tambang. ABSTRACTIn certain case there is a mine tunnel branch that is not mechanically ventilated but air still flow naturally identified as laminar flow. This study modelled the momentum transport of the tunnel air laminar flow with rectangular or Cartesian dimensions to visualize the linear velocity distribution profile of the fluid and the fluid shear stress profile. The modelling method uses analytical mathematical calculations of the Newtonian fluid flow equations of motion for the laminar regime of Navier-Stokes. Some of the data collected are tunnel dimensions, air linear velocity, and temperature. Some physical properties of air are cited from literature. The results of the average air velocity measurement are input into the empirical model to obtain two-dimensional coordinate profiles (x,z) for the shear stress distribution and air velocity that are close to the actual situation for laminar flow in the Cartesian dimension. The results of the study obtained a pressure drop of the flow was 2,2 x 10-5 Pa, the flow using molecular transport instead of forced convection transport because seen from the shear stress distribution profile was too small and the flow rate was 0,32 m3/s did not fulfill the underground mine ventilation function. Keywords: momentum transport; laminar flow; newtonian fluid; mine ventilation.
Effectiveness of the Prof. Tito Storybook in Enhancing Student Learning in Indonesian Language and Natural Science for Fifth Grade Elementary School Students Azima, Nana Fauzana; Iraqi, Hana Shilfia; Algifari, Arif; Zahra, Lailatul; Putri, Ellsy Rahmadani
Mimbar Sekolah Dasar Vol 11, No 2 (2024): On Progress
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53400/mimbar-sd.v11i2.66318

Abstract

This research addresses the issue of unsuitable children's storybooks influencing elementary students' thinking patterns by mirroring adult behaviors, prompting the development of the modern children's storybook "Prof. Tito: Electric Bicycle Edition" to enhance literacy and science technology education. The specific aim is to evaluate the effectiveness of character-based and science technology-focused storybooks in improving Indonesian and natural sciences learning among fifth-grade students. "Prof. Tito, Electric Bike Edition" explores values like cooperation, mutual assistance, and knowledge of electric bicycles, offering a moral foundation for young readers. The study highlights the storybook's role in fostering empathy and focus, while educating readers about electric bicycles in the context of Indonesian language and science. Through student evaluations, the book's efficacy was tested, showing significant learning improvements. The findings reveal a 13.49% and 12.55% increase in learning outcomes, classifying the storybook as moderately effective in enhancing learning. Overall, the research concludes that the storybook significantly contributes to improving student learning outcomes, representing an original contribution to the field.
Y Zeolite-Based Catalyst for Palm Oil Cracking to Produce Gasoline Algifari, Arif; Makertihartha, I. G. B. N.; Subagjo, Subagjo; Prabowo, Heri
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20267

Abstract

The increasing demand for oil fuel and the decline of crude oil reserves highlight the need for alternative energy sources. Palm oil, as a renewable resource, has potential for biofuel production through catalytic cracking. This study aims to develop and evaluate modified zeolite-based catalysts, particularly ZSM-5/HY, to produce palm oil-derived gasoline that meets European fuel standards. The research involved catalyst preparation, modification with ZSM-5 and phosphorus, and activity testing in a fixed-bed reactor. Gasoline yield and catalyst performance were analyzed using gas chromatography. The results showed nearly 100% conversion of palm oil under optimal conditions, with gasoline yield meeting European standard. The addition of ZSM-5 improved conversion and RON, while phosphorus modification reduced catalyst acidity, affecting yield and coke formation. This study concludes that modifying zeolite catalysts with ZSM-5 and phosphorus enables efficient palm oil-derived gasoline production with high RON and reduced aromatic content, contributing to sustainable energy solutions. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Analysis of Ground Movement Using Geographic Information System Method in the Area of Kolok Mudik Village, Barangin District, Sawahlunto City Yanti, Syari Rahma; Putri, Fairus Atika Redanto; Burhamidar, Aulia Hidayat; Nauli, Fitri; Algifari, Arif; Pratama, Herdian
Justek : Jurnal Sains dan Teknologi Vol 8, No 1 (2025): Maret
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i1.29250

Abstract

Abstract:  Kolok Mudik Village area has topography that varies between flat, undulating and hilly with a height above sea level.With this very varied height, it has quite steep slopes and has the potential for landslides. Apart from that, coal mining activities around the village make the land unstable. This research aims to map areas that are prone to land movement in Kolok Mudik village. The method used in this research is using a map overlay using the GeographicIinformation System (GIS) application. The parameters used in this model are soil type, rock type, land slope, geological formation, land use, and rainfall. In the mapping process, each parameter has a classification score which is multiplied by the weight of each parameter. Based on the results of data processing, the results show that the vulnerability of land movement in Kolok Mudik Village is in the medium to high categoryAbstrak: Wilayah Desa Kolok Mudik memiliki topografi yang bervariasi antara datar, bergelombang dan berbukit dengan ketinggian di atas permukaan laut. Dengan ketinggian yang sangat bervariasi tersebut, memiliki lereng yang cukup curam dan berpotensi terjadinya tanah longsor. Selain itu, aktivitas pertambangan batu bara sekitar desa membuat tanah menjadi tidak stabil. Penelitian ini bertujuan untuk memetakan wilayah yang rawan terjadi gerakan tanah di Desa Kolok Mudik. Metode yang digunakan dalam penelitian ini adalah menggunakan overlay peta dengan menggunakan aplikasi Sistem Informasi Geografis (SIG). Parameter yang digunakan dalam model ini adalah jenis tanah, jenis batuan, kemiringan lahan, formasi geologi, penggunaan lahan, dan curah hujan. Dalam proses pemetaan, setiap parameter memiliki skor klasifikasi yang dikalikan dengan bobot masing-masing parameter. Berdasarkan hasil pengolahan data, diperoleh hasil bahwa kerentanan gerakan tanah di Desa Kolok Mudik berada pada kategori sedang hingga tinggi.      
Co-Authors Adrian Adrian Burhamidar, Aulia Hidayat Cahyadi, Tedy Agung Fitri Nauli Heri Prabowo Iraqi, Hana Shilfia Makertihartha, I. G. B. N. Nana Fauzana Azima Pratama, Herdian Putri, Ellsy Rahmadani Putri, Fairus Atika Redanto Rika Ampuh Hadiguna Rika Ernawati Subagjo Subagjo Syari Rahma Yanti Zahra, Lailatul