Article Per Year (5 Year)
p-Index From 2020 - 2025
1.116
P-Index
This Author published in this journals
All Journal Jurnal technoscientia Jurnal Ilmiah MTG Forum Geografi Jurnal Geomine DINTEK JURNAL TEKNOLOGI TECHNOSCIENTIA Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Agustinus Isjudarto
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

Published : 15 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 15 Documents
Search

 1   2 
Geological Identification of Seismic Source at Opak Fault Based on Stratigraphic Sections of the Southern Mountains Pandita, Hita; Sukartono, Sukartono; Isjudarto, Agustinus
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

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

Abstract

Earthquake is one of the unpredicted natural disasters on our earth. Despite of the absence of high-accuracy method to precisely predict the occurrence of earthquake, numerous studies have been carried out by seismologists to find it. One of the efforts to address the vulnerability of a region to earthquakes is by recognizing the type of rock as the source of the earthquake. Opak Fault is an active fault which was thought to be the source of earthquakes in Yogyakarta and adjacent areas. This study aimed to determine the seismic source types of rocks in Yogyakarta and adjacent areas. The methods were by measuring stratigraphic sections and the layer thickness in the western part of Southern Mountains. Field study was done in 6 (six) research sites. Results of stratigraphic measurement indicated the sedimentary rocks in the Southern Mountains was 3.823 km in thick, while the bedrock was more than 1.042 km in thick. Based on the result, the rock types as the seismic source were thought to originate from the continental crust rocks formed of granite and metamorphic complex.
Geological Identification of Seismic Source at Opak Fault Based on Stratigraphic Sections of the Southern Mountains Pandita, Hita; Sukartono, Sukartono; Isjudarto, Agustinus
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i1.1508

Abstract

Earthquake is one of the unpredicted natural disasters on our earth. Despite of the absence of high-accuracy method to precisely predict the occurrence of earthquake, numerous studies have been carried out by seismologists to find it. One of the efforts to address the vulnerability of a region to earthquakes is by recognizing the type of rock as the source of the earthquake. Opak Fault is an active fault which was thought to be the source of earthquakes in Yogyakarta and adjacent areas. This study aimed to determine the seismic source types of rocks in Yogyakarta and adjacent areas. The methods were by measuring stratigraphic sections and the layer thickness in the western part of Southern Mountains. Field study was done in 6 (six) research sites. Results of stratigraphic measurement indicated the sedimentary rocks in the Southern Mountains was 3.823 km in thick, while the bedrock was more than 1.042 km in thick. Based on the result, the rock types as the seismic source were thought to originate from the continental crust rocks formed of granite and metamorphic complex.
Geological Identification of Seismic Source at Opak Fault Based on Stratigraphic Sections of the Southern Mountains Hita Pandita; Sukartono Sukartono; Agustinus Isjudarto
Forum Geografi Vol 30, No 1 (2016): July 2016
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v30i1.1508

Abstract

Earthquake is one of the unpredicted natural disasters on our earth. Despite of the absence of high-accuracy method to precisely predict the occurrence of earthquake, numerous studies have been carried out by seismologists to find it. One of the efforts to address the vulnerability of a region to earthquakes is by recognizing the type of rock as the source of the earthquake. Opak Fault is an active fault which was thought to be the source of earthquakes in Yogyakarta and adjacent areas. This study aimed to determine the seismic source types of rocks in Yogyakarta and adjacent areas. The methods were by measuring stratigraphic sections and the layer thickness in the western part of Southern Mountains. Field study was done in 6 (six) research sites. Results of stratigraphic measurement indicated the sedimentary rocks in the Southern Mountains was 3.823 km in thick, while the bedrock was more than 1.042 km in thick. Based on the result, the rock types as the seismic source were thought to originate from the continental crust rocks formed of granite and metamorphic complex.
PENGARUH MORFOLOGI DAN SIFAT MATERIAL TERHADAP KESTABILAN LERENG DI KECAMATAN KALIBAWANG, KULON PROGO Supandi -; Shilvyanora AR; Isjudarto Ag
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (843.888 KB) | DOI: 10.34151/technoscientia.v10i1.87

Abstract

Mass movement is one of hazard in Indonesia that have significant impact in Indonesia. This hazard caused by Indonesia represent have wet tropik, so that chemical weathering intensive and formed thick soil. Its improve the happening of crisis to this hazard, because material strength will decrease. District of Kalibawang, Kulon Progo morphologicaly have a lot precipitous slope and mount intensive weathering. This condition constituing study concerning slope stability. Method which used in this analysis is slice method with approach of calculation of made moderate Bishop. This method weared many in analysis stability of slope because besides modestly, this method enough is accurate. Than analysis slope stability of some obtained chosen slope have value between 3.378 (stable) until 1.052 is ( labile / critical)
MEWASPADAI MORFOLOGI TELUK SEBAGAI ZONA BAHAYA TSUNAMI Heru Sigit Purwanto; T. Listyani R.A T. Listyani R.A; A. Isjudarto A. Isjudarto; Sari B. Kusumayudha
Jurnal Ilmiah MTG Vol 1, No 1 (2008)
Publisher : Jurusan Teknik Geologi Fakultas Teknologi Mineral UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9.277 KB)

Abstract

Konfigurasi garis pantai di suatu daerah turut berperan dalam menentukan seberapa besar dampak tsunami yang ditimbulkannya. Hasil survai lapangan di beberapa daerah pantai di kawasan Indonesia bagian selatan mengindikasikan bahwa morfologi teluk umumnya berhubungan dengan dampak tsunami yang lebih besar dibandingkan pantai lurus dan panjang. Analisis fraktal telah dilakukan terhadap bentuk garis pantai di bagian selatan Pulau Sumatra, Jawa hingga Nusa Tenggara Timur. Hasilnya menunjukkan bahwa geometri teluk umumnya memiliki dimensi fraktal yang besar dan mempunyai dampak kerusakan yang besar pula terhadap bencana alam tsunami. Dari survai lapangan diketahui bahwa daerah-daerah pantai di Aceh, Pangandaran, Maumere dan sekitarnya telah menderita kerusakan yang cukup besar akibat tsunami, didukung dengan keadaan morfologi yang berupa teluk.
Penaksiran Kadar Al2O3 Pada Endapan Bauksit Laterit Dengan Metode Ordinary Kriging (OK) Dan Inverse Distance Weighting (IDW) Untuk Estimasi Jumlah Sumberdaya Bauksit (Al2O3) Di PT Sandai Kemakmuran Utama Kabupaten Ketapang Kalimantan Barat Saparnas Roni; A.A. Inung Arie Adnyano; Ag. Isjudarto
Jurnal Geomine Vol 8, No 1 (2020): Edisi April 2020
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1555.602 KB) | DOI: 10.33536/jg.v8i1.500

Abstract

Penerapan metode interpolasi dalam penaksiran kadar maupun ketebalan memberikan manfaat yang signifikan terhadap estimasi sumberdaya. Metode yang digunakan dalam penelitian ini adalah metode Ordinary Kriging (OK) dan metode Inverse Distance Weighting (IDW). Dalam penaksiran masing-masing metode akan memberikan nilai RMSE (Root Mean Square Eror) dari hasil cross validation. Nilai RMSE adalah parameter yang dipakai dalam menilai performa masing-masing metode. Model dengan nilai RMSE terkecil dipilih sebagai yang terbaik. Penelitian dilakukan berdasarkan data hasil test pit eksplorasi sebanyak 104 titik. Pada metode interpolasi OK, fitting variogram eksperimental dilakukan dengan menggunakan model spherical, exponential, dan gaussian. Berdasarkan studi variogram, nilai RMSE terkecil terhadap penaksiran ketebalan overburden diperoleh model variogram terbaik adalah exponential sedangkan untuk penaksiran ketebalan ore adalah spherical, dan untuk penaksiran kadar Al2O3 adalah exponential. Estimasi sumberdaya terukur hasil taksiran OK didapatkan total volume OB adalah 791.927,6768 BCM dan 1.341.549,615 ton bijih dengan kadar rata-rata 41,881% Al2O3. Berdasarkan evaluasi parameter power pada metode IDW diperoleh bahwa nilai RMSE terkecil pada penaksiran ketebalan OB menggunakan IDW power 2, sedangkan pada penaksiran ketebalan ore menggunakan IDW power 5, dan pada penaksiran kadar Al2O3 menggunakan IDW power 4. Estimasi sumberdaya terukur hasil taksiran IDW didapatkan total volume OB adalah 770.009,6711 BCM dan 1.329.135,518 ton bijih dengan kadar rata-rata 42,075% Al2O3. Dari hasil analisis metode interpolasi terbaik didapatkan metode terbaik untuk penaksiran ketebalan OB adalah metode IDW (power 2), sedangkan untuk penaksiran ketebalan ore adalah metode OK (spherical), dan untuk penaksiran kadar Al2O3 adalah metode IDW (power 4) sehingga hasil estimasi sumberdaya terukur dengan metode terbaik didapatkan total volume OB adalah 770.009,6711 BCM dan 1.323.541,218 ton bijih dengan kadar rata-rata 42,065% Al2O3.
PENGARUH MORFOLOGI DAN SIFAT MATERIAL TERHADAP KESTABILAN LERENG DI KECAMATAN KALIBAWANG, KULON PROGO Supandi -; Shilvyanora AR; Isjudarto Ag
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 10 No 1 Agustus 2017
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v10i1.87

Abstract

Mass movement is one of hazard in Indonesia that have significant impact in Indonesia. This hazard caused by Indonesia represent have wet tropik, so that chemical weathering intensive and formed thick soil. Its improve the happening of crisis to this hazard, because material strength will decrease. District of Kalibawang, Kulon Progo morphologicaly have a lot precipitous slope and mount intensive weathering. This condition constituing study concerning slope stability. Method which used in this analysis is slice method with approach of calculation of made moderate Bishop. This method weared many in analysis stability of slope because besides modestly, this method enough is accurate. Than analysis slope stability of some obtained chosen slope have value between 3.378 (stable) until 1.052 is ( labile / critical)
OPTIMASI RECOVERY EMAS DAN PERAK DENGAN SIANIDASI PADA DEPOSIT BIJIH EMAS KADAR RENDAH DI PT. NUSA HALMAHERA MINERALS DAERAH GOSOWONG KABUPATEN HALMAHERA UTARA, PROVINSI MALUKU UTARA Apriani Sarempa1; Ag. Isjudarto**
DINTEK Vol 12 No 1 (2019): Dintek Volume 12 Nomor 1 Maret 2019
Publisher : Fakultas Teknik UMMU

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (458.841 KB)

Abstract

ABSTRAK Pemodelan dan estimasi Sumberdaya nikel laterit bertujuan untuk mengetahui penyebaran sumberdaya yang ditampilkan dalam bentuk blok model serta mengetahui hasil estimasi nikel laterit yang akurat dan komersial dari suatu endapan. Hasil pemodelan dan estimasi sumberdaya memprsentasikan bentuk dan penyebaran dari endapan mineral sehingga memudahkan dalam melakukan penambangan serta dapat memperkirakan batas-batas penambangan berdasarkan hasil pemodelan dan estimasi sumberdaya. Data yang digunakan dalam pemodelan dan estimasi sumberdaya nikel laterit terdiri dari data bor hasil eksplorasi, koordinat bor, dan klasifikasi kadar eksplorasi. Metoda Pengolahan dan analisa data menggunakan pemodelan dan Metode estimasi sumberdaya nikel laterit menggunakan pendekatan metode Inverse Distance Weight (IDW) dan Ordinary kriging dengan ukuran grid terbesar 25 M³ dan model ukuran blok 25 M x 25 M tebal blok 3 M dan ukuran blok terkecil 12,5 M x 12, 5 M tebal block terkecil 1.5. Hasil estimasi Sumberdaya Ni metode Inverse Distance Weight (IDW) dengan total tonase sebesar 1,221,090 ton kadar Ni 1.96, kadar Fe 15.91, dan Total hasil estimasi metode Ordinary kriging1,604,063 dengan kadar Ni 1.52 dan kadar Fe 20.01 ton. Berdasarkan hasil estimasi, dilakukan perbandingan kedua metode terhadap data bor eksplorasi (data Komposit kadar Ni). Dari grafik hasil perbandingan terlihat pola grafik kadar kadar Ni yang lebih cenderung mengikuti pola grafik kadar data bor eksplorasi/ data komposit Ni adalah pola grafik data dari metode Ordinary kriging dibandingkan pada metode Inverse Distance Weight.
Akurasi Konturing Trianggulasi Dan Kriging Pada Surfer Untuk Batubara Agung Dwi Sutrisno; Agustinus Isjudarto
Retii Prosiding Seminar Nasional ReTII ke-11 2016
Publisher : Institut Teknologi Nasional Yogyakarta

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

Abstract

Salah satu fokus dari Masterplan Percepatan dan Perluasan Pembangunan Ekonomi Indonesia (MP3EI) adalah pengembangan energi batubara. Sebelum batubara dieksploitasi dilakukan eksolorasi terlebih dahulu. Kegiatan eksplorasi meliputi kegiatan pemboran. Dalam pemboran detil penghematan dapat dilakukan apabila prediksi kedalaman batubara dapat diperkirakan dengan baik.Tujuan penelitian ini adalah untuk menguji keakuratan antara metode trianggulasi dengan metode kriging dalam memprediksi kedalaman lapisan batubara pada suatu lokasi menggunakan software surfer. Pendekatan penelitian ini menggunakan metode komparatif. Data lapisan batubara meliputi koordinat dan elevasi serta elevasi dan ketebalan batubara diplot bersamaan dengan peta topografi. Peta kontur batubara dibuat menggunakan metode trianggulasi dan kriging. Keduanya dikomparasikan. Analisis dilakukan dengan cara crosscheck dari kedua metode di atas dengan record data aktual. Nilai dengan selisih tekecil berarti tingkat akurasinya lebih baik. Hasilnya, metode kriging mempunyai selisih prediksi rata-rata 22,2 m, sedangkan metode trianggulasi mempunyai selisih prediksi 2,4 m. Dengan demikian, metode trianggulasi prediksinya lebih baik dibandingkan dengan metode kriging. Kata Kunci: batubara, konturing, kriging, trianggulasi
Evaluasi Ekonomi Evaluasi Ekonomi Proyek Pengolahan Batu Andesit di PT. Calvary Abadi Desa Somopuro Kecamatan Jogonalan Kabupaten Klaten Mycelia Paradise; Ag. Isjudarto; H. Kresno
Retii Prosiding Seminar Nasional ReTII Ke-14 2019
Publisher : Institut Teknologi Nasional Yogyakarta

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

Abstract

ABSTRACT Calvary Abadi Klaten is an andesite processing plant located in Somopuro, Jogonalan, Klaten, Central Java. The average monthly total production is 51.000 m3. There are four products: 5mm-10mm split stone, 10mm-20mm split stone, 20mm-30mm split stone, and stone ash. The criteria used in this study are NPV (Net Present Value), IRR (Internal Rate of Return), and PBP (payback period). A project is feasible if it fullfills three conditions: NPV is bigger than zero, IRR is bigger than minimum interest rate specified (i *), and PBP is shorter than project life. Sensitivity analysis is used to determine the sensitivity of the project if some of its main variables changed. This study used two capital structures. The first capital structure was 60% own capital and 40% loan capital, and the second was 100% own capital. Based on the calculation results, the first capital structure obtained NPV = Rp. 12,857,234,525, IRR = 42.8%, and PBP = 2.97 years. And the second capital structure obtained NPV = Rp. 9,897,703,535, IRR = 30.1%, and PBP = 3.83 years. Based on the results above, can be concluded that andesite stone processing project at PT. Calvary Abadi Klaten is a feasible project. Based on sensitivity analysis, the project was still feasible when operating cost increased up to 10% and revenue (selling price) decreased up to 10%. Keyword : NPV, PBP, and Sensitivity analysis
Co-Authors A.A Inung Arie Adnyano, A.A Inung Arie Agung Dwi Sutrisno Apriani Sarempa1 Atuna, Blair Budy Wiryawan Erry Sumarjono H. Kresno Hendro Purnomo Heru Sigit Purwanto hidayatullah sidiq Hita Pandita, Hita M. Aldi Rizandi M. RIFKI Mahardika, Yudi Mataheru, Juan Aknes Mycelia Paradise Novandri Kusuma Wardana Saparnas Roni Sari B. Kusumayudha Shilvyanora Aprilia Rande, Shilvyanora Sukartono Sukartono Sukartono Sukartono T. Listyani R.A T. Listyani R.A