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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 294 Documents
HUBUNGAN ANTARA PHYLLIC ALTERATION DENGAN NILAI KEKUATAN BATUAN DI UNDERCUT LEVEL TAMBANG GRASBERG BLOCK CAVE (GBC) PT. FREEPORT INDONESIA Zakaria, Firman; Zakaria, Zulfialdi; Syafri, Ildrem; Wiguna, Purwa
Bulletin of Scientific Contribution: GEOLOGY Vol 15, No 3 (2017): Bulletin of Scientific Contribution:GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (836.015 KB) | DOI: 10.24198/bsc geology.v15i3.15101

Abstract

ABSTRACTThe Grasberg Block Cave (GBC) underground mine consists of multiple intrusion stages become into the Grasberg Intrusion Complex (GIC). The intrusion is consists of three intrusion stages, Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) and Kali Intrusion (KI). The emplacement of intrusions occurred in a relatively short span between 3.51Ma (Dalam stage), 3.21Ma (Main Grasberg stage) and 3.1Ma (Kali stage). The existence of magmatic activity that occurs is the main control of mineral formation changes that affect the condition of rocks and quality of Cu-Au. Different type of alteration and mineralization on GIC rock can change its physical properties. Variations of mineral alterations that are formed due to the variation of intrusion causes the variation of mineral alteration that affect the value of rock strength. The value of rock strength affects the determination of rock support that will be mined in the Grasberg Block Cave underground mine (GBC). XRD analysis with mineral content dominance quartz 30.07%, sericite 22.72%, k-feldspar 13.38%, fe sulphide 9.80% and CaSulfate 5.72%. XRD analysis results are type of phyllic alteration. Point load analysis in the research area of 347 pieces of rock drill hole found rock strength value is dominated by weak (0.2 ? 1 Mpa) - medium (1 ? 2 Mpa). Rock Mass Rating (RMR) analysis calculation result value is RMR 20 - 60 (poor - fair). Keywords: Grasberg Block Cave, phyllic alteration, XRD Analysis, Point Load Test analysis,  ABSTRAKTambang bawah tanah Grasberg Block Cave (GBC) terdiri dari beberapa tahapan intrusi yang tergabung ke dalam jenis Komplek Batuan Beku Grasberg (GIC). Tahapan intrusi dari tua ke muda adalah Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) dan Kali Intrusion (KI). Adanya aktifitas magmatik yang terjadi merupakan kontrol utama pembentukan mineral ubahan yang berpengaruh terhadap kondisi batuan. Variasi mineral ubahan yang terbentuk akibat dari adanya variasi intrusi menyebabkan adanya variasi mineral ubahan yang berpengaruh terhadap Tambang bawah tanah Grasberg Block Cave (GBC) terdiri dari beberapa tahapan intrusi yang tergabung ke dalam jenis Komplek Batuan Beku Grasberg (GIC). Tahapan intrusi dari tua ke muda adalah Dalam Intrusion Complex (DIC), Main Grasberg Intrusion (MGI) dan Kali Intrusion (KI). Adanya aktifitas magmatik yang terjadi merupakan kontrol utama pembentukan mineral ubahan yang berpengaruh terhadap kondisi batuan dan kualitas cebakan Cu-Au. Variasi mineral ubahan yang terbentuk akibat dari adanya variasi intrusi menyebabkan adanya variasi mineral ubahan yang berpengaruh terhadap nilai mekanika batuan. Analisa XRD dengan dominasi kandungan mineral quartz 30.07%, sericite 22.72%, k-feldspar 13.38%, fe sulphide 9.80% dan casulfate 5.72%. Hasil analisis XRD tersebut masuk ke dalam tipe phyllic alteration. Analisis uji kuat tekan batuan (Point Load Test) pada daerah penelitian terhadap 347 buah conto batuan lubang pemboran memberikan nilai kekuatan batuan didominasi oleh nilai kekuatan batuan lemah (weak, 0.2 ? 1 Mpa) - sedang (medium, 1 ? 2 Mpa). Kata kunci: Grasberg Block Cave, phyllic alteration, XRD Analysis, Point Load Test.
PERILAKU AKTIVITAS TANAH UNTUK MENDUKUNG INFRASTRUKTUR DI MAJALENGKA DAN SEKITARNYA -, Zufialdi Zakaria
Bulletin of Scientific Contribution: GEOLOGY Vol 10, No 1 (2012): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (779.739 KB) | DOI: 10.24198/bsc geology.v10i1.8273

Abstract

Physical development of the region will always be associated with infrastructure studies. Construction plans in Kertajati International Airport, will bring the study of the infrastructure related to public facilities, which supports the international airport in West Java. Including a study of infrastructures are the foundation for buildings, roads, bridges, buildings, dams, etc., also the slope which is the result of slope stability design. This study discusses the behavior of the activity of high plasticity clay (CH) toward safety factor of slope and soil bearing capacity. Safety factor of slope is represented by value of FS (Factor of Safety) with a specified slope angle, so the increasing soil activity (A) is known relationship with a decrease in the value of the slope safety factor (FS). Soil bearing capacity is represented by the value of qa (allowable soil bearing capacity) for square and circular foundation type, so that the relationship of soil bearing capacity is decreasing with increasing value of soil activity. The study is expected to be developed, to facilitate the safety factor is the estimated slope and soil bearing capacity estimated by examining the number of activity as an early indicator. The relationship between the allowable soil bearing capacity (qa) for shallow foundations (of a square type) with soil activity (Skempton, and Seed) shows the equation qa = 7.89890 A (-1.01759) a negative relationship with correlation coefficient R = - 0754, and qa = 8.81669 A (-0.83957) a negative relationship with correlation coefficient R = - 0722. The relationship between the allowable soil bearing capacity (qa) for shallow foundation (of a circular type) with soil activity (Skempton, and Seed) shows the equation qa = 7.80513 A (-1.06644) a negative relationship with correlation coefficient R = - 0780, and qa = 8.77028 A (-0.88473) a negative relationship with correlation coefficient R = - 0722, it indicates that bearing capacity land values decline with increasing soil activity. The relationship between the security factor (FS) with 15o slope angle A activity figures show the equation FS = 1.517 A -0.79 with R ² = 0.625; The relationship between the safety factor (FS) with 30o slope angle A activity figures show the equation FS = 1.721 A - 0.78 with R ² = 0.64. Handling of expansive soil can be through soil improvement. To planning the foundation and slope infrastructures, is required safe design in accordance with assessment of soil bearing capacity and Factor of Safety (FS) of slopes, in order to avoid design failure. 
BATUBARA FORMASI STEENKOOL DI DAERAH RANSIKI, PAPUA Setiadi, Djadjang Jedi; Alam, Syaiful; Nurdrajat, .; Gani, Reza Mohammad Ganjar; Firmansyah, Yusi
Bulletin of Scientific Contribution: GEOLOGY 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 (1212.477 KB) | DOI: 10.24198/bsc geology.v16i3.19008

Abstract

Makalah ini menyajikan hasil penelitian terhadap salah satu endapan batubara yang belum banyak dikenal dalam literatur geologi Indonesia, yakni batubara Formasi Steenkool (akhir Miosen ? Plistosen) yang ada di daerah Ransiki, Kepala Burung, Papua. Hasil penelitian lapangan menunjukkan bahwa batubara Formasi Steenkool dapat dibedakan menjadi tiga jenis, yakni bright coal, banded bright coal, dan dull coal. Batubara tersebut umumnya berwarna hitam dengan gores coklat, dan keras. Belerang kadang-kadang ditemukan mengisi bidang pecah planar hingga conchoidal yang berkembang didalamnya. Lapisan-lapisan batubara Formasi Steenkool di daerah Ransiki memiliki ketebalan yang sangat bervariasi, mulai dari beberapa centimeter hingga hampir 3 m. Sebagian diantaranya mengandung parting serpih karbonan dengan ketebalan umumnya kurang dari 20 cm. Lapisan-lapisan batubara umumnya diapit oleh lapisan serpih karbonan, meskipun ada sebagian diantaranya yang dialasi atau ditutupi oleh lapisan batupasir halus. Hasil penelitian laboratorium terhadap 13 sampel terpilih mengindikasikan bahwa batubara Formasi Steenkool umumnya memiliki kelembapan rata-rata < 3% adb, kadar abu rata-rata < 5%, kadar volatil rata-rata > 40%, kandungan karbon tertambat rata-rata > 45%, dan kadar belerang rata-rata < 1% dengan nilai kalor > 5000 kal/g. Penelitian ini mengungkapkan hasil yang berbeda dengan laporan yang selama ini diterima mengenai batubara Formasi Steenkool. Pertama, hasil penelitian ini menujukkan bahwa hampir semua batubara Formasi Steenkool di daerah penelitian merupakan high-volatile subbituminous coal, bukan lignit sebagaimana dilaporkan selama ini. Kedua, batubara Formasi Steenkool memiliki kualitas yang cukup baik. Hal itu terlihat dari bukti fisik sebagaimana terlihat di lapangan dan dari hasil penelitian laboratorium yang menunjukkan bahwa semua sampel memiliki nilai kalor lebih dari 5000 kal/g. Hasil penelitian ini mengindikasikan bahwa batubara Formasi Steenkool layak diteliti lebih lanjut dan seksama untuk mengetahui potensi endapan batubara di wilayah Kepala Burung, Papua, dan untuk mengkaji nilai ekonomis yang mungkin dimilikinya.Kata kunci: Formasi Steenkool, Batubara, Papua 
KANDUNGAN MIKROFOSIL DALAM FORMASI PEMBAWA BATUBARA DARI DAERAH PERIAN KECAMATAN MUARA MUNTAI, KABUPATEN KUTAI KERTANEGARA, KALIMANTAN TIMUR -, Winantris; -, Ildrem Syafri; -, Rusman Rinawan
Bulletin of Scientific Contribution: GEOLOGY Vol 4, No 1 (2006): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1073.234 KB) | DOI: 10.24198/bsc geology.v4i1.8109

Abstract

The research uses two kinds of microfossils for an aim to produce more precision, which Palinomorph as a main object and foraminifera as the support object. Pollen analysis has the main role in paleo-environment reconstruction, based on ecological characteristics plants association. Using palinomorph and foraminifera together in one research can only be conducted through sediments transition. Coals are included in the category, where coal samples were taken from Sungai Perian near Pulaubalang-Pamaluan formation boundary.From four samples that were analyzed (1R / claystone, 3R / claystone, 5R / claystone carbonaceous, and 7R / claystone) 53 genera and only 5 foraminifera species was founded. Both microfossils have yielded the same interpretation. The relative ages of the pollen indicator are from Middle-Early Miocene, and the relative ages of the foraminifera are from Late-Early Miocene. Based on the palinomorph and foraminifera data the research area was on regressions environment during the geologic period mentioned.
“SAVE WATER, SAVE JAKARTA” CAMPAIGN AS LAND SUBSIDENCE MITIGATION IN JAKARTA Jihadi, Luthfan Harisan; Ali, Abu Abdillah; Zakaria, Zufialdi; Anural, Muhammad Bey
Bulletin of Scientific Contribution: GEOLOGY 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 | DOI: 10.24198/bsc geology.v12i1.8363

Abstract

Jakarta, a very populated capital city of Indonesia, was built above alluvial deposit which is currently subsiding relative to sea level at a high rate. As a result Jakarta becomes more often to be flooded with water that delivered from other regions and also the sea level rises relative to land and shoreline move toward the ground are increasing feasibility of tidal flood to occur. Consolidation process of the ground acts as a cause to the land subsidence in Jakarta. The fact is water needs in Jakarta is high due to its high population. Therefore, large amount in withdrawal of groundwater occurs and causes the ground to settle. In order to decrease the rate of land subsidence, groundwater should be extracted in a proper, more effective and efficient way. Younger generation is advised to save water using a fresh approach which is easy to be understood and accepted. In the future, people in Jakarta will consider that saving water as a norm which brings great benefit to their environment, Jakarta.
ANALISIS LINGKUNGAN PENGENDAPAN BATUGAMPING BERDASARKAN DISTRIBUSI UNSUR KIMIA DI DAERAH CIDORA, KECAMATAN AJIBARANG, KABUPATEN BANYUMAS , JAWA TENGAH Fauzielly, Lili; Hamdani, A. Helman
Bulletin of Scientific Contribution: GEOLOGY Vol 13, No 3 (2015): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (579.261 KB) | DOI: 10.24198/bsc geology.v13i3.8407

Abstract

Studies on the distribution of chemical elements Lawangdora limestone area has been conducted to determine the depositional environment is based on the chemical characteristics . The purpose of this study was to apply the theory of Chilingar who stating that Mg levels will decrease when deposited away from the beach. The results showed that the study area is dominated by calcite limestone, and the type is low magnesium calcite . This is a type of calcite carbonate in deep marine sediments. Based on the cross section of the direction and distance relative to the content of the element magnesium ( Mg ) is seen that the direction of deepening moves relative to the north.
MORFOMETRI DAERAH ALIRAN SUNGAI PADA BENTANGALAM VULKANIK KWARTER TERDEFORMASI -, Emi Sukiyah; -, Mulyono
Bulletin of Scientific Contribution: GEOLOGY Vol 5, No 3 (2007): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (321.964 KB) | DOI: 10.24198/bsc geology.v5i3.8146

Abstract

The Quaternary volcanic terrain has unique characteristic. Those phenomena are reflected by basin morphometry. Some morphometry variables can used are basin dimention, azimuth of river segment, azimuth of terrain lineament, river length (Ls), drainage density (Dd), and bifurcation ratio (Rb).Upper Citarum River area is the research area, exactly on Cijoho Basin, Cihejo Basin, Cigalugah Basin, and Barugbug Basin. Base on literature study result and field survey, those four basins have difference geological setting. Probabilistic approach used for know difference and similarity of basins. Statistic tests used are distribution normality of data and average difference tests.Result of research show highest Dd value exist on Cijoho Basin (3.78), otherwise its lowest exist on Barugbug Basin (2.35). That?s phenomena reflect difference of its volcanic rock characteristic. Commonly Rb values < 3 show that deformed basins. Rb values increase to downstream of Cihejo Basin, meanwhile on the other basins they are decrease. The Rb values escalation to downstream indicate strongly deformation at downstream of Cihejo Basin. The rivers of Cijoho Basin direct the-90o until 179o controlled by active tectonic. Meanwhile, the rivers pattern of Basins of Cihejo, Barugbug, and Cigalugah are controlled by active tectonic.
ANOMALI IMBUHAN PADA SEGMEN ZONA TRANSFER SISTEM FLUVIAL CIKAPUNDUNG, JAWA BARAT Tanuwijaya, Zamzam A. J.; Hendarmawan, Hendarmawan; Sudrajat, Adjat; Kuntjoro, W.
Bulletin of Scientific Contribution: GEOLOGY Vol 14, No 3 (2016): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1166.169 KB) | DOI: 10.24198/bsc geology.v14i3.10968

Abstract

     Terdapat indikasi adanya gejala kehilangan debit sungai yang bersifat alami (non-rekayasa) pada segmen zona transfer Cikapundung, yaitu pada jalur sungai antara daerah Maribaya dan Curug Dago. Karena segmen ini bersifat effluent (air tanah mengisi air sungai) maka gejala imbuhan yang terjadi pada segmen ini merupakan suatu anomali influent (air sungai mengisi air tanah). Bagian dasar sungai pada zona ini ditutupi oleh lapisan lava basal yang masif, sehingga proses imbuhan yang terjadi diduga melalui struktur rekahan batuan. Berdasarkan hasil pengujian statistik dapat disimpulkan bahwa pada zona transfer memang terjadi gejala anomali imbuhan, yaitu pada sub-segmen sungai yang bergradien rendah dan berdensitas kelurusan regional tinggi. Sub-segmen yang berdensitas kelurusan tinggi secara umum memiliki densitas rekahan batuan yang tinggi pula.Kata kunci: zona transfer, imbuhan, effluent, influent     There is an indication of a natural loss of discharge phenomenon within the zone transfer of Cikapundung which are located between Maribaya area and Curung Dago. Because this segment is effluent in nature, the symptom of recharge that happened in this segment is an anomaly. The river bed in this zone is covered by massive basalt layers. Therefore the recharge process that happened is through the fractured of basalt. The results of a statistical test conclude that in the transfer zone there is a recharge anomaly phenomenon which is in the sub-segment of the river which has both a low gradient and a high regional lineament density. In general, the sub-segment that is of a high lineament density also shows high fracture density.Keywords: transfer zone, recharge, effluent, influent
DESTINATION BRANDING KAWASAN WISATA CILETUH- PELABUHAN RATU SUKABUMI MELALUI GEOPARK Mustikaningsih, Marlina; Novianti, Evi; S, Diah Fatma
Bulletin of Scientific Contribution: GEOLOGY Vol 17, No 2 (2019): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (226.285 KB) | DOI: 10.24198/bsc geology.v17i2.21779

Abstract

Ciletuh adalah sebuah daerah yang berada di pelosok Sukabumi berada di sepanjang pesisir pantai selatan ?barat Sukabumi Jawa Barat. Ciletuh telah di resmikannya sebagai  kawasan Geopark   Ciletuh ?Pelabuhan Ratu pada tanggal 17 April 2018  oleh UNESCO menjadi Ciletuh - Palabuhanratu UNESCO Global. Sejak itulah Ciletuh mulai dikenalkan sebagai sebuah kawasan geopark. ?Destination Branding kawasan wisata Ciletuh-Sukabumi melalui Geopark?.  Membangun brand sebuah kawasan  wisata di wilayah  Suabumi melalui potensi yang dimiliki yaitu geopark, sehingga lebih terarah dan bermanfaat secara maksimal untuk keberlanjutan serta kemandirian sebuah komunitas masyarakat di kawasan wisata.
HUBUNGAN ANTAR KOMPONEN MIKROFASIES LERENG TERUMBU DAN CEKUNGAN LOKAL BELAKANG TERUMBU PADA BATUGAMPING BIOKLASTIKA FORMASI BATURAJA DI DAERAH SEKITAR MUARADUA, SUMATERA SELATAN -, Sigit Maryanto
Bulletin of Scientific Contribution: GEOLOGY Vol 8, No 1 (2010): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1460.087 KB) | DOI: 10.24198/bsc geology.v8i1.8240

Abstract

Bioclastic limestones from Baturaja Formation cropped out at Muaradua area, South Sumatera is a good object of research for studying microfacies of limestone. Based on the rock features under the polarization microscope of the bioclastic limestones taking from studied area could be predicted the limestones are predominantly deposited at reef-flank and back-reef local basin. The main components T-F-P test of the limestones showing a significant difference of the carbonate grains, terrigenous grains, and neomorphism materials between two depositional environments. The other side, matrix, cement, and rock porosity components have no significant difference.

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