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Bulletin of Scientific Contribution : Geology
ISSN : 16934873     EISSN : 2541514X     DOI : doi.org/10.24198/bsc%20geology.v18i1
BSC Geology adalah jurnal yang dikelola oleh Fakultas Teknik Geologi Universitas Padjadjaran,terbit 3 kali dalam setahun (April, Agustus, dan Desember), yang menerbitkan karya tulis ilmiah dalam bidang kebumian terutama yang berkaitan dengan geologi seperti : Petrologi Paleontologi Geomorfologi Stratigrafi Geologi Dinamik Geologi Lingkungan dan Hidrogeologi Geologi Teknik Geokimia Geofisika Sedimentologi. Setiap artikel yang akan diterbitkan adalah bersifat tanpa biaya (no processing charges dan no submission charges). Dewan redaksi dan penerbit tidak pernah meminta bayaran untuk penerbitan pada jurnal ini. Tujuan dari jurnal ini adalah untuk memperkaya pengetahuan dan informasi tentang ilmu kebumian dan dapat dimanfaatkan untuk kemaslahatan bersama.
Articles 413 Documents
KONTROL STRUKTUR GEOLOGI TERHADAP SEBARAN BATUBARA DI DAERAH MENUKUNG-NANGAPINOH KALIMANTAN BARAT -, Iyan Haryanto
Bulletin of Scientific Contribution Vol 6, No 2 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (984.31 KB) | DOI: 10.24198/bsc.v6i2.8165

Abstract

Coal outcrop in Menukung area and Nangapinoh met in Melawi basin. This basin have experienced of several tectonic causes coal seam folded and faulted.Result of measurement entire coal outcrop shown strike between N 240°E – N 315°E with dip between 5° until 10°. Based on contruction result strike pattern known distribution coal in surface with orientation Southwest-Northeast and dip orientation Northwest, North until Northeast.dengan demikian sebaran batubara controlled by homocline fold structure. Based on strike and dip data and kind of geology structure that controlling it, so that known in northern research area have potention good enough.
Potensi Airtanah Berdasarkan Nilai Resistivitas Batuan di Kelurahan Cangkorah, Kecamatan Batujajar, Kabupaten Bandung Barat Mohammad, Febriwan; Mardiana, Undang; Yuniardi, Yuyun; Firmansyah, Yusi; Alfadli, Muhammad Kurniawan
Bulletin of Scientific Contribution Vol 14, No 2 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1321.29 KB) | DOI: 10.24198/bsc.v14i2.9799

Abstract

Groundwater is water that contain under the soil or rock which located in subsurface layer. The resistivity method or geoelectricity using electrical properties of subsurface materials to obtain the anomalies. Aquisition data did with 2 line of 2-D resistivity and 10 point of 1-D resistivity. The result from 1-D resistivity are divided into three classification : First classification had range between 1 – 5 Wm which indicate the  rock with low resistivity and shallow. This layer interpretated as clay from Saguling Lake sedimentation and this layer act as aquiklud layer. The second classification with range between 6 – 20 Wm indicated as medium resistivity and act as aquitard. The third classification  with range more than 20 Wm indicated as high resistivity and act as aquifer with low productivity. From the 2-D resistivity survey, such as : Low resistivity range assosiated with shaly tuff lithology and sandy tuff, depth of the low resistivity range about 0 – 40 meters, Medium resistivity range had depth about 10 – 70 meters, act as aquifer due to have well porosity properties. High resistivity range depth is more than 70 meters until 100 meters assosiated with massif layer, bad porosity, and did not have rock pore, the lithology is collaboration between massif breccia with igneous component. Keyword : Geoelectricity, Resistivity, Batujajar, Groundwater, Aquifer Air tanah merupakan air yang terdapat di dalam lapisan tanah atau batuan yang terletak di bawah permukaan tanah. Metode resistivitas (resistivity) atau geolistrik memanfaatkan sifat kelistrikan material bawah permukaan untuk mendapatkan anomali. Pengukuran dilakukan sebanyak 2 lintasan geolistrik 2-D dan 10 titik pengukuran 1-D. Dari hasil pengukuran metode 1-D diperoleh 3 paket batuan yaitu : Paket lapisan batuan 1 dengan nilai tahanan jenis berkisar antara 1 – 5 Wm yang mengindikasikan batuan dengan resistivitas amat rendah dan dangkal. Lapisan ini diduga berupa lempung dari endapan danau Saguling. Lapisan ini diduga berperan sebagai akiklud. Paket lapisan batuan 2  dengan nilai tahanan jenis antara 6 hingga 20 Wm mengindikasikan batuan dengan resistivitas menengah dan bersifat sebagai akitar . Paket lapisan batuan 3 dengan nilai tahanan jenis antara lebih dari  20 Wm mengindikasikan batuan dengan resistivitas yang tinggi dan dapat berperan sebagai akifer dengan produktivitas rendah. Dan dari hasil geolistrik 2-D, yaitu : Rentang resisitivitas rendah kemungkinan berasosiasi dengan batuan dengan litologi tuf lempungan dan tuf pasiran memiliki kedalaman bervariasi antara 0-40 meter, Rentang resistivitas menengah memiliki kedalaman bervariasi sekitar 10-70 meter. Porositas paket batuan ini diperkirakan baik, dan dapat berperan sebagai akifer, Rentang resisitivitas tinggi ini berasosiasi dengan rentang kedalaman yang bervariasi mulai dari 70 meter hingga kedalaman lebih dari 100 meter berasosiasi dengan Lapisan keras, massif, porositas buruk dan tidak dapat menyimpan air di antara pori-pori batuannya, berupa perpaduan antara breksi padu dengan komponen batuan beku. Kata kunci : Geolistrik, Resistivitas, Batujajar, Airtanah, Akifer
KARAKTERISTIK KETEKNIKAN TANAH DAN HUBUNGANNYA DENGAN PENGEMBANGAN WILAYAH DI KAWASAN PENGEMBANGAN TERPADU - JATINANGOR, KABUPATEN SUMEDANG, JAWA BARAT -, Zufialdi Zakaria; -, Yuyun Yuniardi; -, Irvan Sophian
Bulletin of Scientific Contribution Vol 5, No 1 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.49 KB) | DOI: 10.24198/bsc.v5i1.8131

Abstract

Soil in research areal consist of CH (clay, high plastisitas) and MH. (silt, high plastisitas). Soil activity at area of Jatinangor is vary from low activity to high. But in general soil activity is hidh-medium. Activity number by Seed is A = 0.40 until 0.86 with nature mineral of kaolinitic until ilitic. Stability of slope can be designed as according to slope-stability design. At exposition slope, slope with angle 45o, two terrace and ground water level at - 2 M, high of slope 5 M and level off 5 M, Safety Factor = 2.094. Soil bearing capacity for square, circular & continuous foundations have medium-high activity show relationship that: Increasing of soil activity value cause decreasing of value of soil bearing capacity. Safety Factor of slope and soil bearing capacity is very supporting of environmental aspect in Jatinangor development area. Geological evaluation of development area is required to study both aspect (slope safety and bearing capacity).Environmental management is required before the rains arrive, because ground water rate will increasing at rainfall condition. It is required to manage negative impact. It is required to anticipate or eliminated its impact, or generating positive impact to be managed by improving it. Environmental monitoring is required to be instructed as anticipatory effort of damages or effect of negative impact.
INITIAL SURVEY OF IRON SAND, AT THE MALANG, PEJAGRAN & KEBURUHAN VILLAGES, NGOMBOL SUBDISTRICT, PURWOREJO REGENCY, CENTRAL JAVA PROVINCE -, Geni Dipatunggoro
Bulletin of Scientific Contribution Vol 10, No 2 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1528.186 KB) | DOI: 10.24198/bsc.v10i2.8282

Abstract

Initial Survey of iron sand Including geological mapping and shallow drilling (which only 10 meter penetration), this activity is a pilot project of PT. Karya Buana Abadi as the fander and trusted to geological engineering department survey team of Padjadjaran University Bandung and used Q Muria Swasindo flag as permission letter keeper from Purworejo Regency.Iron sand resources which fand in research area was rich, start from the surface of the soik to the bottom of shallow drilling, from its 50 Ha area there are 14 million ton deposit of iron sandwhich in the future wilk sold to Korea for industrial need.
Karakteristik Musiman Debit Sungai Cikapundung di Kawasan Bandung Utara, Jawa Barat Tanuwijaya, Zamzam A.J.; Hendarmawan, .; Sudrajat, Adjat; Kuntjoro, W.
Bulletin of Scientific Contribution Vol 16, No 1 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (788.612 KB)

Abstract

Debit sungai di DAS Cikapundung KBU (Kawasan Bandung Utara) secara umum mengandung oleh komponen musiman dan komponen anomali. Dalam penelitian ini diterapkan analisis harmonik terhadap komponen musiman untuk mengekstrak siklus-siklus yang membangun komponen ini. Hasil penelitian memperlihatkan bahwa rataan normal debit dibangun oleh tiga siklus utama: siklus tahunan, tengah tahunan, dan 4 bulanan. Hasil ini diperkuat oleh analisis spektral terhadap data mentah debit yang memunculkan sinyal-sinyal signifikan pada tiga periode tersebut. Berdasarkan analisis spektrum silang dan koherensi, dapat disimpulkan bahwa determinan utama variasi debit adalah pola curah hujan di cekungan drainase Lembang (DAS Cikapundung Hulu). Puncak debit sungai rata-rata terjadi pada masa musim penghujan kedua (Monsun Australia), sedangkan puncak curah hujan rata-rata terjadi pada masa musim penghujan pertama (Monsun Asia). Kata kunci: debit, musiman, monsun, harmonik, koherensi
POTENSI TANAH MENGEMBANG DI KABUPATEN PURWAKARTA, JAWA BARAT -, Zufialdi Zakaria; -, Edi Tri Haryanto
Bulletin of Scientific Contribution Vol 8, No 2 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (486.276 KB) | DOI: 10.24198/bsc.v8i2.8249

Abstract

Based on Geological Map of Pamanukan Sheet (scale 1:100.00) and Karawang Sheet (1:100.000), at northern ward of Purwakarta Regency, there are some rocks formation, e.g. Jatiluhur Formation, Subang Formation, and some Aluvials. Swelling potential analysis is based on Seed Method (Seed, et al.,1962, from Hunt, 2007). Soil samples at Aluvial terrain shows swelling characteristics very high (usually at clay of Subang Formation), its activity value is 1.31, predicted monmorilonitic (Bowles, 1989). Soil sample at clay terrain of Subang Formation shows low swelling potential (its not characteristic of Subang Formation), activity value is 0.21 (is predicted Illitic based on Bowles, 1989), and soil sample at clay terrain of Jatiluhur Formation, shows medium swelling potential characteristic with activity value is 0.52.
PERUBAHAN LINGKUNGAN PENGENDAPAN PADA KALA MIOSEN AKHIR-PLIOSEN AWAL BERDASARKAN KUMPULAN FORAMINIFERA BENTONIK KECIL PADA LINTASAN KALI JRAGUNG, KABUPATEN DEMAK, JAWA TENGAH Jurnaliah, Lia; Syafri, Ildrem; Sudrajat, Adjat; Kapid, Roebiyanto
Bulletin of Scientific Contribution Vol 15, No 1 (2017): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (724.689 KB)

Abstract

ABSTRACTResearch area is located in Demak regency, Northern Central Java. Sixteen samplesediments was carried out from 140 meter section in Jragung River with 10 meter interval.Species and specimen of small benthic foraminifera was quantified in every 1 (one) gramdry sample sediment. Cluster analyses of small benthic foraminifera assemblages showedthat research area is comprises of 4 (four) biofacies. There are Biofacies A-JR (deep seawith middle bathyal zone), biofacies B-JR (shallow sea with outer shelf zone), biofacies C-JR (deep sea with middle bathyal – abyssal zone) and biofacies D-JR (deep sea withmiddle bathyal – lower bathyal zone). Eventually, during Late Miocene – Early Pliocenethere were 8 (eight) times fluctuate environmental (bathymetric zone) changes from deepsea to shallow sea.Key words: Small benthic foraminifera, biofacies, deep sea, shallow seaABSTRAKDaerah penelitian terletak di Kabupaten Demak, Jawa Tengah. Sebanyak 16 sampelsedimen diambil pada LIntasan Kali Jragung sepanjang 140 meter dengan interval 10meter. Penghitungan jumlah spesies dan jumlah individu foraminifera bentonik kecildilakukan pada setiap 1 (satu) gram sampel sedimen kering. Berdasarkan analisis klusterterhadap kumpulan foraminifera bentonik kecil, daerah penelitian terbagi menjadi 4(empat) biofasies, yaitu: Biofasies A-JR dengan lingkungan laut dalam (zona batialtengah); Biofasies B-JR dengan lingkungan laut dangkal (zona paparan luar); BiofasiesC-JR dengan lingkungan laut dalam (zona batial tengah-zona abisal) dan Biofasies D-JRdengan lingkungan laut dalam (zona batial tengah-zona batial bawah). Selama KalaMiosen Akhir-Pliosen Awal daerah penelitian mengalami 8 (delapan) kali perubahanlingkungan laut (zona batimetri) yang fluktuatif dari laut dalam menjadi laut dangkal.Kata Kunci: Foraminifera bentonik Kecil, biofasies, laut dalam, laut dangkal
FORAMINIFERA SEBAGAI PENCIRI PALEO ENVIRONMENT: STUDI KASUS PADA LINTASAN KALI BENTUR, NGAWENAN, BLORA -, Lili Fauzielly
Bulletin of Scientific Contribution Vol 6, No 1 (2008): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (662.454 KB) | DOI: 10.24198/bsc.v6i1.8155

Abstract

Foraminifera analysis taken from 18 surface sample from sandstone unit and siltstone unit, Kali Bentur section, Ngawenan area, Blora.According quantitative analysis, foraminifera assemblages consist of 39 species (218.128 individu) planktonic and 53 species (16.384 individu) bentic , with abundance of Globigerinoides trilobus imaturus, Globigerinoides trilobus trilobus, Globoquadrina altispira, Globoquadrina dehiscens, Orbulina universa, Globorotalia menardii and Bolivina, Batisiphon, Cibicides, Robulus, Planulina, Uvigerina dan StilostomelaForaminifera planktonic distribution indicated tropical zone, warm water(24oC - 28oC ) salinity 34-36 ppm, and based on bentic foraminifera, there were paleoenvironment change that more deep from sandstone unit to silt unit.
HUBUNGAN NILAI GAMMA RAY DENGAN BATUAN PIROKLASTIK DI DAERAH CIBIRU DAN SEKITARNYA, KOTA BANDUNG, PROVINSI JAWA BARAT Hadiasti, Widia; Muslim, Dicky; Zakaria, Zulfialdi
Bulletin of Scientific Contribution Vol 14, No 1 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1231.249 KB) | DOI: 10.24198/bsc.v14i1.9787

Abstract

Surface gamma ray measurements were conducted at 40 sites in Cibiru area, Bandung, West Java. This location is part of Digital Topographic Map of Indonesia (Bakosurtanal) Lembar Bandung (Silitonga, 1973).  Geographically is located between E 1070 42’ 22” to 1070 45’ 05” and S 060 53’ 30” to 060 57’ 15”. This study aims to determine the value of gamma ray measured, its relationship with the content of feldspar minerals and its relationship with pyroclastic rock. Geological mapping was conducted in this research area and gamma ray measured using a gamma ray detector Radi PA-100 Horiba, and then carried out petrographic analyses of rock samples to determine the mineral content. The result reveals that the study area is consisted of coarse tuff, fine tuff and volcanic breccia with gamma ray values are different at each sites. The average value of gamma ray in coarse tuff is 0.046 ± 0.028 nSv/h, in fine tuff is 0.046 ± 0.028 nSv/h and for breccia is 0.059 ± 0.018 nSv/h. High feldspar mineral content contained in the breccia 79%, and low feldspar mineral content in fine tuff 13%. The study reveals that the value of gamma ray is relationship with the content of feldspar mineral. The relationship between value of gamma ray and pyroclastic rock that can be known from the content of feldspar mineral. High feldspar mineral content contained in pyroclastic rock that are intermediate to acid. Keywords : gamma ray,  feldspar, pyroclastic rocks.Pengukuran nilai gamma ray telah dilakukan pada 40 stasiun di daerah Cibiru dan sekitarnya, Kota Bandung, Provinsi Jawa Barat. Secara administratif, lokasi penelitian tercakup dalam peta topografi Lembar Bandung (Silitonga, 1973) skala 1:25000 dan secara geografis daerah penelitian terletak pada 1070 42’ 22” BT sampai 1070 45’ 05” BT dan 060 53’ 30” LS sampai 060 57’ 15” LS. Penelitian ini bertujuan untuk mengetahui nilai gamma ray dengan batuan piroklastik dilihat dari kandungan mineral feldspar (plagioklas  (NaAlSi3O8) dan k-feldspar (KAlSi3O8)) pada batuan. Metode penelitian yaitu dengan melakukan pemetaan geologi dan pemetaan nilai gamma ray dilakukan dengan menggunakan alat detektor Radi PA-100 Horiba kemudian dilakukan analisis petrografi untuk mengetahui kandungan mineral feldspar ( plagioklas dan k-feldspar) pada batuan. Hasil penelitian menunjukkan bahwa litologi penyusun daerah penelitian memiliki nilai gamma ray yang berbeda-beda. Nilai gamma ray pada Satuan tuf kasar rata-ratanya yaitu 0,046 ± 0,028 µSv/h, pada Satuan tuf halus rata-ratanya yaitu 0,047 ± 0,021 µSv/h dan rata-rata nilai gamma ray pada breksi yaitu 0,059 ± 0,018 µSv/h. Hubungan nilai gamma ray dengan batuan piroklastik dapat diketahui dari kandungan mineral feldspar yang terdapat dalam tuf kasar, tuf halus dan breksi monomik. Semakin tinggi kandungan mineral feldspar pada tuf kasar, tuf halus dan breksi monomik maka nilai gamma ray-nya pun makin tinggi dan sebaliknya. Komposisi mineral feldspar yang tinggi (unsur K tinggi) terdapat dalam batuan piroklastik yang bersifat menengah sampai asam. Kata kunci : gamma ray, feldspar, batuan piroklastik. 
KARST CITEUREUP UNTUK SUPLEMEN DOKUMEN AMDAL DAN PENAMBANGAN BATUGAMPING -, Geni Dipatunggoro
Bulletin of Scientific Contribution Vol 4, No 2 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (846.971 KB) | DOI: 10.24198/bsc.v4i2.8119

Abstract

Karst can be defined as a peculiar and dry landscape developed as a result of dominantly dissolutional erosion of limestone by rain origin water which enter into the limestone and circulate in the underground drainage then resurgent to the surface as springs. The term karst is derived from the Yugoslavian language “kras” meaning “stone”, and has a root of Italian place Carso. This term is applied to a relative narrow strip of limestone extending along the northeastern coast of the Adriatic Sea.The composition of rocks in the investigated area consists of bioclastic Miocene aged limestone of the Kelapanunggal Formation overlying alternating claystone and sandstone belonging to the Cibulakan Formation of the same age.The Karst developed in investigation areas : 1. Dolines and 2. Kockpit Doline, 3. Swallow Holes, 4.Collapse Cave, 5. Singking Stream and 6. Uvala.

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