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Muhammad Kurniawan Alfadli
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m.kurniawan@unpad.ac.id
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+6285669298592
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bsc.ftg@unpad.ac.id
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Kota bandung,
Jawa barat
INDONESIA
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
LOW RANK COAL FORMASI SAJAU DAERAH TELUK SEMANTING DAN TANJUNG BATU KECAMATAN PULAU DERAWAN, KABUPATEN BERAU – KALIMANTAN TIMUR -, Geni Dipatunggoro
Bulletin of Scientific Contribution Vol 5, No 2 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (884.715 KB) | DOI: 10.24198/bsc.v5i2.8138

Abstract

The studied area belong to Teluk Semanting vilage and Tanjung Batu vilage, Pulau Derawan District, Berau Regency, East Kalimantan Province.Coal Bearing Formation is Sajau Formation with the younger from Latih Formation at PT. Berau Coal mine, description is black, vitreous luster, subconcoidal fracture, very hard to soft, brown streak, is general resin and piryt and sometimes wood structure. Phisycal is based on Sub Bituminus B Coal. Outcrop is followed the folded wich North West – South East, the range of strike N300ºE – N00ºE and N120ºE – N170ºE. The dip of coal is 8ºNE - 28ºNE and 5ºSW - 13ºSW.Indicated reserve of coal at study area is based on resources calculating with make use of the regional geologic explanation has reached 136 million ton, This reserve belong to the middle of the big mining.Quality of coal at study area with the measured parameter is “inherent Moisture” =10,20%-14,58,8%, Ash = 1,10%-7,61%, “Volatile Matter” = 36,58%-45,49%, “Fixed Carbon” = 37,50-45,72%, “Total Sulphur” = 0,12%-2,86%, Calorivic value the range = 5.666 – 6.427 Kkal/kg.
DEBIT ALIRAN (WATER YIELD) SUB-DAS CIGUMENTONG DAN CIMULU SUB-DAS CITARIK BAGIAN PALING HULU Haryanto, Edi Tri; Nur, Andi Agus; Haryanto, Iyan; Yuniardi, Yuyun
Bulletin of Scientific Contribution Vol 13, No 2 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (557.577 KB) | DOI: 10.24198/bsc.v13i2.8397

Abstract

Cigumentong and Cimulu sub-watersheds are growing at vokanik denudasional landform with geological formations of undeferienciated old volcanic product consists of tuff , breccia and lava of the uppermost of Citarik Sub-Catchment . Based on the order system according to Strahlaar both river is a river -order 4 , with the land cover of relatively dense forest vegetation with an area of 552 Ha respectively and 606 Ha . This study aims to investigate the flow discharge characteristics of the two rivers by measuring daily and daily rainfall during the period 20 December 2014 through to March 2015, or for 71 days . The research result is fluctuations in flow discharge rate between the River Cigumentong and Cimulu tend to be similar . Inlfiltration coefficient of Cimulu sub-watersheed was slightly larger (0.54)than that was Cigumentong sub-watersheed (0.53), with the infiltration thickness of 695 mm for Cimulu and 577 mm for Cigumentong. Runoff coefficient Cimulu sub-watersheed is larger (0.44) than Cigumentong (0.37) .
Identifikasi Keragaman Geologi Kerucut Sinder Gunung Slamet Sebagai Objek Geowisata Z, Agustina Djafar; Nurlathifah, Wilda Aini
Bulletin of Scientific Contribution Vol 18, No 1 (2020): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (755.638 KB) | DOI: 10.24198/bsc.v18i1.26154

Abstract

Gunung Slamet sebagai gunung tertinggi di Jawa Tengah merupakan stratovolcano yang telah mengalami beberapa kali erupsi. Secara administratif Gunung Slamet terletak di antara 5 kabupaten, yaitu Kabupaten Brebes, Kabupaten Banyumas, Kabupaten Purbalingga, Kabupaten Tegal, dan Kabupaten Pemalang, Provinsi Jawa Tengah. Tubuh vulkanik Gunung Slamet merupakan hasil dari dua fase vulkanisme yang saling tumpang tindih, yaitu Gunung Slamet Tua dan Gunung Slamet Muda. Produk gunungapi  Slamet Tua melampar di bagian barat, sedangkan produk gunungapi Slamet Muda tersebar di bagian timur. Salah satu produk vulkanisme Slamet Muda adalah dijumpainya puluhan kerucut sinder yang tersebar baik secara berkelompok maupun berdiri sendiri (soliter) di lereng timur Gunung Slamet. Tujuan dari pembuatan makalah ini adalah untuk mengidentifikasi keragaman geologi dari beberapa kerucut sinder yang terdapat di lereng timur Gunung Slamet sebagai warisan geologi, dan selanjutnya direkomendasikan sebagai objek wisata berbasis edukasi geologi (geowisata). Metode pengidentifikasian dilakukan berdasarkan “Standar teknis inventarisasi keragaman geologi dan Petunjuk Teknis Asesmen Sumberdaya Geologi” yang dikeluarkan oleh Pusat Survei Geologi (2017). Dari hasil pengamatan Citra TerraSAR dan pengambilan data di lapangan, kerucut sinder di lereng timur Gunung Slamet berjumlah 37 buah, dimana morfologi kerucut sinder tersebut memiliki nilai warisan geologi tinggi karena mengandung rekaman ilmiah, tatanan geologi atau bentangalam yang spesifik, yang dapat dimanfaatkan untuk penelitian, pendidikan, pemahaman alam dan konservasi. Untuk memudahkan penilaian secara kualitatif potensi suatu keragaman geologi sebagai situs warisan geologi, dipilih 3 kerucut sinder yang dianggap mewakili dan memiliki keragaman tersendiri (keragaman bentang alam dan batuan), yaitu kerucut sinder Bukit Lompong, Bukit Siremeng, dan Bukit Batusanggar. Dari hasil pembobotan nilai tersebut maka kerucut sinder di lereng timur Gunung Slamet memiliki penilaian scientific “Sedang”.Kata kunci: Slamet Tua, Slamet Muda, lereng timur, kerucut sinder, geowisata.
FASIES BATUBARA FORMASI WARUKIN BERDASARKAN ANALISIS CORE DI DAERAH SUNGAI DIDI, KECAMATAN DUSUN TIMUR, KABUPATEN BARITO TIMUR KALIMANTAN TENGAH Yuniardi, Yuyun
Bulletin of Scientific Contribution Vol 3, No 2 (2005): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (472.644 KB) | DOI: 10.24198/bsc.v3i2.7451

Abstract

Research area layed on Sungai Didi, Dusun Timur District, Barito Timur Residence, KalimantanTengah Province. The border in geographically, 1150 11’ 1,22” – 1150 12’ 35” East Longitude and 20 2’27,93” – 20 3’ 28,74” South Latitude.Geology of research area consisted of two rock units, there were sandstone unit and claystone unit.Claystone unit consisted of claystone with alternated by coal, and then sandstone unit consisted ofsandstone which have coarse grain to fine grain. Both of those units were related with WarukinFormation, where formed at fluviatil environment with Middle Miosen of age.Research area facies would have four kinds and made into the group, there were MS (massivesandstone), FS (fining upward sandstone), CL (claystone) and Co (coal). Facies model which made haveconsisted of MS facies in lowers followed with FS facies, and then CL facies and Co in uppers.Keywords : Warukin Formation, Fluviatil, Facies
KERAGAMAN FORAMINIFERA BENTONIK KECIL RESEN PADA CORE-01 DI PERAIRAN JEPARA, PROVINSI JAWA TENGAH Aswad, Siti Mulia Nurul; Jurnaliah, Lia; -, winantris
Bulletin of Scientific Contribution Vol 12, No 1 (2014): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (391.076 KB) | DOI: 10.24198/bsc.v12i1.8365

Abstract

Foraminifera live from shallow marine into deep marine. Environment itself has their own characteristic of foraminifera. Indonesia which is an archipelago country has highly foraminifer’s diversity. Research area is located in Jepara Water and is a part of Java Sea. Geographically, core-01 is lied on 05055’18.66” Latitudes and 110042’34.55” Longitudes. This research is done in order to know the diversity of recent small benthic foraminifera , so that, is there an environmental changes of core-01. Quantitative method is used on 12 sample sediment below sea floor with interval depth 50.00 – 50.55 meter. The identified recent small benthonic foraminifera are compound of 43 genera and 73 species. Based on research, there are changes of diversity genera, diversity species, and individual numbers of recent small benthic foraminifera. Those changes can be used as an indicator of vertically core-01 environmental changes.
BATUAN SEDIMEN DI CEKUNGAN OBI SERTA POTENSINYA SEBAGAI BATUAN SUMBER Putra, Andri Perdana; Gani, Reza Mohammad Ganjar
Bulletin of Scientific Contribution Vol 16, No 3 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (661.04 KB) | DOI: 10.24198/bsc.v16i3.18815

Abstract

Cekungan Obi merupakan cekungan Tersier di Kawasan Timur Indonesia yang memiliki endapan batuan sedimen berumur Paleogen dan Neogen namun belum memproduksi hidrokarbon, sehingga menarik untuk dipelajari dan dikaji potensi sumberdaya minyak dan gas buminya. Daerah penelitian cekungan Obi meliputi pulau Bacan dan pulau Kasiruta di bagian utara serta pulau Obi dan pulau Obilatu di bagian selatan yang secara administrasi termasuk ke dalam Kabupaten Halmahera Selatan, Propinsi Maluku Utara. Tujuan dilakukannya penelitian ini adalah untuk mengkaji potensi batuan sumber (source rock) cekungan Obi yang mendukung dalam prospeksi sistem perminyakan cekungan Obi. Metode yang digunakan dalam penelitian ini mencakup pengamatan dan perekaman data lapangan serta pengambilan contoh batuan terhadap satuan-satuan batuan di beberapa lokasi dan lintasan pengamatan terpilih untuk analisa geokimia organik. Lokasi pengamatan lapangan terhadap satuan batuan dilakukan di lokasi tipe tempat batuan tersebut pertama kali diamati dan dinamakan. Formasi Loleobasso disebandingkan dengan formasi Piniya yang diendapkan pada laut dangkal-paparan yang dipengaruhi oleh pasang surut. Formasi Fluk kemungkinan diendapkan pada area laut dangkal, Formasi Amasing kemungkinan diendapkan pada area laut dangkal, Formasi Ruta kemungkinan diendapkan pada area laut dangkal-paparan dan Formasi Woi kemungkinan diendapkan pada area laut dangkal-paparan. Berdasarkan hasil analisa TOC terhadap percontoh satuan-satuan batuan di beberapa lokasi dan lintasan pengamatan terpilih dapat disimpulkan bahwa secara umum cekungan Obi memiliki potensi batuan sumber dengan kategori buruk, dengan kerogen tipe III dan tipe IV. Tingkat kematangan termal batuan sumber cekungan Obi umumnya berada pada tingkat belum matang, matang dan overmature. Kata Kunci: Cekungan Obi, Batuan Sedimen, Batuan Sumber, Nilai TOC.
SURVEY TINJAU BAHAN GALIAN NIKEL DAERAH SOLIGI, KECAMATAN OBI SELATAN KABUPATEN HALMAHERA SELATAN, MALUKU UTARA -, Geni Dipatunggoro
Bulletin of Scientific Contribution Vol 9, No 2 (2011): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1465.861 KB) | DOI: 10.24198/bsc.v9i2.8266

Abstract

Ofiolite and metamorphic the oldest rock which found in Obi Island in pre-tertiery age. Contact of both rock estimated as structural contact. Ofiolite consist of peridotite, piroxenite, gabro, basalt, and metabasalt. As for metamorph are schist-mica and phylite. Those rocks especially found in the west side of Obi Island and the minor part found in the outcrops of the south.Peridotite in research area is source rocks which affected by hydrothermal fluids which occur in the end of magmatism processes and change peridotite into serphentinite (peridotite-serphentinite) and this processes known as the beginning of nickel laterite deposit formation process.Mechanical and chemical weathering to the provenance which contain Ca, Mg, Fe, Na, Si, Cr, Mn, Ni, Co, causes this integration and decomposition where those material soluble and then deposited again as somekind of mineraqlsw 
POTENSI AKUIFER AIR TANAH PADA BATUAN SEDIMEN TERSIER BERDASARKAN ANALISIS DATA GEOLISTRIK DI DISTRIK WAISAI KOTA KABUPATEN RAJA AMPAT, PROVINSI PAPUA BARAT Gisland, Grand; Alam, Boy CSS Syah; Nur, Andi Agus
Bulletin of Scientific Contribution Vol 15, No 2 (2017): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1570.873 KB) | DOI: 10.24198/bsc.v15i2.13837

Abstract

ABSTRAKKabupaten Raja Ampat merupakan bagian dari Provinsi Papua Barat yang memiliki potensi sumber air tanah dengan deposit air tanah yang cukup besar. Namun hingga saat ini data mengenai potensi air tanah di Kabupaten Raja Ampat belum ada. Maka hal inilah yang mendasari untuk dilakukan penelitian mengenai potensi akuifer air tanah pada batuan sedimen tersier berdasarkan analisis data geolistrik. Penelitian ini dilakukan di Distrik Waisai Kota, Kabupaten Raja Ampat dengan tahapan kegiatan meliputi pengamatan geologi daerah penelitian, pengukuran geolistrik dengan konfigurasi Schlumberger, pengolahan data resistivitas 1D, pemodelan 2D dan 3D dengan metode Anisotropic Inverse-Distance Weighted (IDW-Anisotropic) dan Isokonturing resistivitas, analisis dan interpretasi data, validasi data, serta perhitungan potensi air tanah. Pengukuran geolistrik dilakukan sebanyak 11 (sebelas) titik ukur di lokasi sekitar Kelurahan Bankawir dan Perumahan 300, Distrik Waisai Kota, Kabupaten Raja Ampat, Provinsi Papua Barat yang terletak pada koordinat geografis 130,82 – 130,89 Bujur Timur dan 0,43 – 0,38 Lintang Selatan. Penelitian ini bersifat analisis untuk mengetahui bagaimana karakteristik akuifer dan potensi air tanah, baik dari data primer maupun data sekunder. Litologi di lokasi penelitian didominasi oleh adanya pasir yang berselang seling dengan lempung. Secara umum berdasarkan interpretasi dari nilai tahanan jenis 1D (sounding) dapat disimpulkan bahwa karakteristik akuifer yang berada di lokasi penyelidikan terdiri atas akuifer bebas dan akuifer tertekan. Diduga bahwa lapisan yang bertindak sebagai akuifer bebas adalah lapisan pasir, yang secara umum berada pada rentang kedalaman 1.27 – 10.00 meter dengan rentang ketebalan antara 3.59 – 5.81 meter dan rentang nilai resistivitas 1.13 - 14.90 Ωm. Sedangkan lapisan yang bertindak sebagai akuifer tertekan yaitu lapisan pasir yang secara umum berada pada rentang kedalaman 22.30 – 75.00 meter dengan rentang ketebalan antara 10.90 - 37.10 meter dan rentang nilai resistivitas 28.20 - 150 Ωm. Berdasarkan hasil perhitungan potensi air tanah pada akuifer bebas dari tiap segmen di Distrik Waisai Kota, Kabupaten Raja Ampat diketahui bahwa area yang memiliki potensi sumberdaya air tanah yang potensial terletak pada segmen 2, dengan nilai Q Max sebesar 0.000331 m3/sec atau 28.598,4 liter/hari.Kata Kunci: Potensi Air Tanah, Akuifer, Geolistrik, Isoresistivity ABSTRACTRaja Ampat Regency is part of West Papua Province which has a large groundwater deposit. Data on the potential of groundwater in Raja Ampat regency has not existed yet. So this is the basis for research on the potential groundwater on free aquifer based on geoelectric measurements. This research was conducted in Waisai Kota District, Raja Ampat Regency with activity as follow: geological observation of research area, geoelectric measurements with Schlumberger configuration, 1D resistivity data processing, 2D and 3D modeling with Anisotropic Inverse-Distance Weighted(IDW-Anisotropic) and Isoconturing resistivity, data analysis and interpretation, data validation, and ground water potential calculation. Geoelectric measurements were carried out at 11 (eleven) measuring points at the locations around Bankawir and Perumahan 300, Waisai Kota District, Raja Ampat Regency, West Papua Province , which located at 130.82 - 130.89 East and 0.43 - 0,38 South. This research is an analysis about the free aquifer characteristics and ground water potential, both from primary data and secondary data. Lithology at the study site is dominated byintermittent sand with clay. Based on the interpretation of the resistance value, it can be concluded that the aquifer characteristics at study site consist of free aquifer and distressing aquifer. It is presumed that the layer acting as a free aquifer is a layer of sand, which is generally indepth range from 1.27 to 10.00 meters with a thickness range between 3.59 - 5.81 meters and a resistivity range of 1.13 - 14.90 Ωm. The layer acting as a distressing aquifer is sand layer that generally located in the depth of 22.30 - 75.00 meters with thickness range between 10.90 - 37.10 meters and resistivity range 28.20 - 150 Ωm. Based from the result of ground water potential calculation from each segment in Waisai District, Raja Ampat District, it is known that the area with potential groundwater resource potential lies in segment 2, with the value of Q Max 0.000331 m3 / sec or 28,598.4 liters /day.Key Word: Ground Water Potential, Aquifer, Geoelectric, Isoresistivity
DISTRIBUSI UKURAN BUTIR MATRIKS BREKSI GUNUNGAPI DI DAERAH LOMBOK TIMUR, NUSA TENGGARA BARAT -, Sigit Maryanto
Bulletin of Scientific Contribution Vol 7, No 1 (2009): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2787.912 KB) | DOI: 10.24198/bsc.v7i1.8233

Abstract

Volcanic rock units of the Kalipalung, Kalibabak, and Lekopiko Formations are well cropped out at East Lombok area, composed predominantly of volcanic breccias. Grainsize analysis of selected volcanic breccias matrix show a similarity characters on the Kalipalung and Kalibabak Formation. On the other hand, a real difference founded between these formations with the Lekopiko Formation.
FASIES DAN LINGKUNGAN PENGENDAPAN BATUGAMPING FORMASI PARIGI DI DAERAH PANGKALAN, KARAWANG, JAWA BARAT Fernando, Yogi; Syafri, Ildrem; Jambak, Moh. Ali
Bulletin of Scientific Contribution Vol 13, No 1 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2353.439 KB) | DOI: 10.24198/bsc.v13i1.8384

Abstract

Facies and depositional environments were studied to determine the growth of the carbonate rocks of Parigi Formation in Pangkalan District, Karawang, West Java. The study was conducted at nine outcrops to identify the characteristics of the macroscopic observations. Some thin section of limestone sample was taken at each location of the observations used to make microscopic analysis. Macroscopic and microscopic analysis of twenty one rock sample classified into six facies, namely: coral bafflestone facies, coral bindstone facies, algae - foraminifera packstone facies, foraminifera packstone facies, interbedded wackestone – grainstone facies, and mudstone facies. A composite log created on the outcrops around G.Guha to determine the stratigraphic of Parigi Formation in Pangkalan District. Facies succession in the composite log grouping facies into several depositional facies associations, namely: fore reef facies, offreef slope facies, reef front facies, and reef flat facies. Depositional environments are fore reef and core reef.

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