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All Journal Jurnal Pertambangan Jurnal Pendidikan IPA Indonesia Journal of Regional and City Planning Atom Indonesia
B. Setiawan
Faculty of Mathematics and Natural Science, Universitas Negeri Surabaya, Indonesia
Humanities Civil Engineering, Building, Construction & Architecture Education Energy Engineering Environmental Science Physics Social Sciences Transportation

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Housing Policy For Indonesia: Market Enabling or Community Enabling? Setiawan, B.
Journal of Regional and City Planning Vol 12, No 4 (2001)
Publisher : Center for Research and Community Services ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (678.203 KB)

Abstract

This article questions the unclear policy direction and development program of urban housing in Indonesia and suggests some basic changes. The main message of this article is that housing development program in Indonesia should emphasize on creating a condition that enables the community to build their own houses (community enabling). A policy that is totally market oriented and emphasizes on economic efficiency (market enabling) is not abandoned, bus should be develop without sacrificing the aspect of social justice.
The Effectiveness of Gadget-Based Interactive Multimedia in Improving Generation Z’s Scientific Literacy Widodo, W.; Sudibyo, E.; Suryanti, S.; Sari, D. A. P.; Inzanah, I.; Setiawan, B.
Jurnal Pendidikan IPA Indonesia Vol 9, No 2 (2020): June 2020
Publisher : Program Studi Pendidikan IPA Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpii.v9i2.23208

Abstract

Scientific literacy is very important to generation Z (Gen-Z), while Gen-z’s scientific literacy in Indonesia needs to be improved. The use of gadgets by Gen-Z almost all the time in their daily lives enables research to improve scientific literacy by using gadgets. This study aims to determine the effectiveness of gadget-based interactive multimedia to improve Gen-Z scientific literacy and describe the Gen-Z response to interactive multimedia. This research was a pre-experiment study with one group pretest and posttest design. Interactive multimedia was designed to be applied on gadget, consists of Socioscientific Issues (SSI) which was relevant to pressure concepts. This research involved two junior high schools in East Java, Indonesia. Scientific literacy test instrument was designed based on scientific literacy aspects of PISA 2015. The inferential test results showed that posttest score was significantly greater than the pretest in the two schools. Results showed that the mean score of students’ scientific literacy at School I increased from 39.6 to 74.0 and N-gain score was 0.57 which was in medium category. In addition, the average scientific literacy score of students in School II also increased from 31.5 to 59.9 and Ngain score was 0.41 which was in the medium category. The inferential test results also showed that there were no significant N-gain differences in the two schools. It can be concluded that interactive multimedia developed effective to improve students’ scientific literacy. However, Gen-Z students cannot be satisfied with the multimedia. Students suggest several multimedia enhancements in terms of visual, audio, and music, so that they can enjoy the multimedia all the time by using the device. 
PEMILIHAN OPTIMUM PIT LIMIT BERDASARKAN VOLATILITAS HARGA BATUBARA MENGGUNAKAN DISCOUNTED CASH FLOW Hardiman, V.; Ibrahim, E.; Setiawan, B.; Yusuf, M.
Jurnal Pertambangan Vol 8 No 1 (2024): Februari 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i1.2260

Abstract

Nilai cadangan total dari sebuah pit pada tambang terbuka batubara didapatkan dari pemilihan pit shell dengan Net Present Value (NPV) tertinggi dari keseluruhan hasil pit optimasi yang telah dilakukan dengan bantuan perangkat lunak dengan algoritma tertentu. Pada umumnya NPV dihitung menggunakan harga batubara acuan (HBA) terbaru pada saat perhitungan dilakukan tanpa mempertimbangkan fluktuasi harga yang pernah terjadi. Sehingga nilai yang didapatkan tidak relevan lagi apabila terjadi perubahan harga yang sinifikan di masa mendatang. Penelitian bertujuan untuk menentukan optimum pit shell dari setiap hasil pit optimisasi dengan melakukan simulasi keekonomian menggunakan Discounted Cash Flow (DCF) berdasarkan volatilitas harga jual batubara historis. Metode DCF dipilih untuk mengambil keputusan karena mudah dipahami dan cepat diadopsi. Sifat dari metode ini sangat sensitif terhadap perubahan kecil dalam tingkat diskonto dan asumsi tingkat pertumbuhan. Metode DCF memperhitungkan NPV dari aliran kas berdasarkan harga jual komoditas bahan galian yang dianggap konstan dengan menetapkan discount factor. Volatilitas mewakili tingkat risiko suatu proyek yang dilihat dari perubahan harga jual dalam periode tertentu di masa lampau. Tahapan yang dilakukan mulai dari melakukan validasi model geologi, perhitungan break even stripping ratio, proses pit optimasi, perhitungan volatilitas harga batubara, sampai dengan valuasi DCF. Hasil penelitian menunjukkan perbedaan optimum pit shell antara penggunaan HBA aktual dengan harga yang telah didiskon dengan volatilitas. Pit shell optimum dengan menggunakan volatilitas memiliki cadangan yang lebih rendah daripada pit shell optimum dengan penggunaan harga aktual HBA.
Characterization and Sorption Study of Cesium-137 by Bentonite from Santrijaya, Indonesia as an Engineering Barrier Material for Radioactive Waste Disposal Facilities Sriwahyuni, H.; Krisnandi, Y. K.; Basuki, T.; Setiawan, B.; Budianti, A.; Anggraini, Z.; Nurliati, G.; Pamungkas, N. S.
Atom Indonesia Vol 51, No 3 (2025): DECEMBER 2025
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/aij.2025.1628

Abstract

Engineered barrier materials, such as bentonite, play a critical role for the safety of radioactive waste disposal systems by limiting radionuclide migration. This study aims to evaluate the mineralogical, chemical, and morphological characteristics of natural bentonite from Santrijaya, Tasikmalaya, Indonesia, and to investigate its Cs-137 sorption behavior, focusing on its potential as a candidate for engineered barrier materials. X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) analyses showed that the bentonite predominantly consists of montmorillonite, with silica contributing about 80 percent of its composition. The material shows a specific surface area of 121.89 m²/g and a cation exchange capacity of 43.23 meq/100g, supporting its suitability for radionuclide sorption. The sorption capacity at equilibrium (q_e) achieved at 536.67 mg-Cesium/g-bentonite after 10 days of contact time, with adsorption kinetics that follows the Pseudo-Second Order (PSO) model and the distribution coefficient (K_d) value of 5211 mL/g. The study shows the competitive effects of K+ and Na+ ions, with K+ ions showing a stronger competitiveness for Cs-137 binding sites than that of Na+, which could influence radionuclide retention. These findings highlight the high sorption efficiency and stability of Santrijaya bentonite, showing its potential as a barrier material for radioactive waste containment systems and suggest the necessity of considering competing ion interactions in the design of barrier materials.
Co-Authors Anggraini, Z. Basuki, T. Budianti, A. D. Astriani, D. D. K. Innatesari, D. K. G. Nurliati, G. Hardiman, V. Ibrahim, E. Inzanah, I. Krisnandi, Y. K. M. Yusuf Martini, M. Pamungkas, N. S. Rosdiana, L. S. Sudarmin, S. S.A. Bachtiar, S.A. Sari, D. A. P. Sriwahyuni, H. Subekti, H. Sudibyo, E. Sunarto Sunarto Suryanti, S. T. Sunarti, T. W. B. Sabtiawan, W. B. W. Widodo Y. Astuti