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All Journal Rotasi IJOG : Indonesian Journal on Geoscience BERITA BIOLOGI
A. Budiman
GDA Consulting
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Mechanical Engineering

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Paleogene Sediment Character of Mountain Front Central Sumatra Basin Budiman, A.; Bachtiar, A.; Suandhi, P. A.; Rozalli, M.; Utomo, W.
Indonesian Journal on Geoscience Vol 8, No 3 (2013)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1342.655 KB) | DOI: 10.17014/ijog.v8i3.164

Abstract

DOI: 10.17014/ijog.v8i3.164The SE-NW trending Mountain Front of Central Sumatra Basin is located in the southern part of the basin. The Mountain Front is elongated parallel to the Bukit Barisan Mountain, extending from the Regencies of North Padang Lawas (Gunung Tua in the northwest), Rokan Hulu, Kampar, Kuantan Singingi, and Inderagiri Hulu Regency in the southeast. The Palaeogene sediments also represent potential exploration objectives in Central Sumatra Basin, especially in the mountain front area. Limited detailed Palaeogene sedimentology information cause difficulties in hydrocarbon exploration in this area. Latest age information and attractive sediment characters based on recent geological fieldwork (by chaining method) infer Palaeogene sediment potential of the area. The Palaeogene sedimentary rock of the mountain front is elongated from northwest to southeast. Thickness of the sedimentary unit varies between 240 - 900 m. Palynology samples collected recently indicate that the oldest sedimentary unit is Middle Eocene and the youngest one is Late Oligocene. This latest age information will certainly cause significant changes to the existing surface geological map of the mountain front area. Generally, the Palaeogene sediments of the mountain front area are syn-rift sediments. The lower part of the Palaeogene deposit consists of fluvial facies of alluvial fan and braided river facies sediments. The middle part consists of fluvial meandering facies, lacustrine delta facies, and turbidity lacustrine facies sediments. The upper part consists of fluvial braided facies and transitional marine facies sediments. Volcanism in the area is detected from the occurrence of volcanic material as lithic material and spotted bentonite layers in the middle part of the mountain front area. Late rifting phase is indicated by the presence of transitional marine facies in the upper part of the Palaeogene sediments.
Kajian Kekuatan Tarik dan Struktur Mikro Hasil Pengelasan Shield Metal Arc Welding dan Friction Stir Welding Baja Karbon St 37 Sulardjaka, Sulardjaka; Fitriyana, D. F.; Budiman, A.
ROTASI Vol 19, No 4 (2017): VOLUME 19, NOMOR 4, OKTOBER 2017
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1648.027 KB) | DOI: 10.14710/rotasi.19.4.193-200

Abstract

Penelitian ini bertujuan untuk meneliti kekuatan tarik, hasil pengelasan shield metal arc welding (SMAW) dan friction stir welding (FSW) baja St 37. Pada penelitian ini, pengelasan SMAW dilakukan dengan variasi kecepatan pengelasan dan arus pengelasan. Pengelasan SMAW menggunakan elektroda E7016 dengan variasi arus pengelasan: 60 A, 80A, dan 100 A, serta variasi kecepatan pengelasan: 0,2 cm/detik, 0,4 cm/detik dan 0,7 cm/detik. Pengelasan FSW dilakukan dengan menggunakan mesin freis CNC pada variasi kecepatan putaran pahat: 1500 rpm dan 2000 rpm. Pengujian tarik dilakukan sesuai standar ASM E8/E8M – 09. Hasil pengujian tarik menunjukkan, nilai kekuatan tarik tertinggi pengelasan SMAW dihasilkan dari pengelasan dengan arus 60 A dan kecepatan pengelasan 0,7 cm/detik, yaitu sebesar 373 MPa. Pengelasan dengan parameter pengelasan ini, menghasilkan sambungan dengan nilai elongasi sebesar 1,54%. Pengelasan FSW dengan kecepatan putaran pahat 2000 rpm, menghasilkan kekuatan tarik sebesar 350 MPa dan nilai elongasi nya 25,3%.
SIFAT KELAMIN, PEMIJAHAN DAN PERKEMBANGAN LARVA REMIS CORBICULA JAVANICA (MOUSSON, 1849) (MOLLUSCA, PELECYPODA : CORBICULIDAE) DJAJASASMTTA, M.; BUDIMAN, A.
BERITA BIOLOGI Vol 2, No 8 (1984)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v2i8.1411

Abstract

Penelitian mengenai aspek-aspek biologi remis marga Corbicula yang ada di Indonesia dapat dikatakan masih amat sedikit.Beberapa aspek yang telah dikerjakan antara lain mengenai sistimatiknya (Benthem Jutting 1953 dan Djajasasmita 1977) dan bebeiapa aspek ekologinya oleh Budiman & Djajasasmita (1979). Tulisan ini menguraikan hasil penelitian lanjutan Budiman & Djajasasmita (1979) dengan tekanan pada aspek-aspek sifat kelamin, pemijahan dan pertumbuhan larva remis Corbicula javanica dari perairan sekitar Bogor.
Co-Authors A. Bachtiar DJAJASASMTTA, M. Fitriyana, D. F. M. Rozalli P. A. Suandhi Sulardjaka Sulardjaka W. Utomo