Judul: Penerapan Metode Common Reflection Surface (CRS) dan Radon Transform Pada Data Seismik 2D multichannel di perairan Laut Sulawesi.
Abstrak: Penelitian ini bertujuan menerapkan metode CRS dan Transformasi Radon pada data seismik 2D. Data seismik merupakan hasil akuisisi survei geologi laut oleh Pusat Penelitian dan Pengembangan Geologi Laut (PPPGL) pada bulan November 2016 di perairan Laut Sulawesi. Pengolahan data dilakukan dari memasukan data ke dalam sistem (input data) hingga penjumlahan sinyal seismik (stacking), yang kemudian dilanjutkan dengan menerapkan metode CRS dan Transformasi Radon. Metode CRS mengestimasi kecepatan suara melalui pendekatan geometri (α, , dan ) dan Tranformasi Radon mengubah domain seismik ( ) kedalam domain Radon ( ). Hasil pengolahan menunjukan bahwa hasil CRS Stack dapat menghasilkan penampang seismic yang lebih baik daripada stack konvensional. Selain itu, hasil CRS stack dapat dijadikan acuan dalam penentuan batas multiple dan primary dalam transformasi Radon, sehingga pantulan ganda (multiple) dari penampang dapat tereduksi dan mendekati rupa asli penampang.
Keyword: Common Refection Surface, Laut Sulawesi, multiple, stacking, transformasi Radon

Judul: Analisis Perbandingan Metode Surface Related Multiple Elemination dan Transformasi Radon dalam Atenuasi Multiple pada Data Seismik 2D Perairan Dangkal di Cekungan Waipoga, Papua
Abstrak: Metode seismik umum digunakan dalam kegiatan eksplorasi hidrokarbon dengan memanfaatkan penjalaran gelombang suara. Data 2D seismik laut yang digunakan pada penelitian ini merupakan data mentah hasil akuisisi seismik laut di perairan dangkal Cekungan Waipoga, Papua. Data mentah hasil akuisisi mengandung multiple yang disebabkan oleh perbedaan nilai impedansi akustik yang besar pada batas lapisan, sehingga gelombang seismik yang dipancarkan terperangkap dalam lapisan air atau lapisan batuan dasar perairan. Multiple membuat gambaran penampang seismik menjadi tidak fokus pada sinyal primer. Oleh karena itu, diperlukan metode atenuasi multiple yang tepat sehingga dapat dihasilkan gambaran penampang yang lebih jelas. Penelitian ini menggunakan metode Surface Related Multiple Elimination (SRME) dan transformasi Radon sebagai metode atenuasi multiple pada data seismik yang diproses hingga hasil akhir Pre-Stack Time Migration (PSTM). Berdasarkan dari pengolahan yang telah dilakukan didapatkan hasil bahwa metode atenuasi multiple dengan metode SRME lebih efektif mereduksi multiple terutama pada near offset sedangkan metode transformasi Radon lebih baik dalam mengurangi multiple pada far offset.
Keyword: data seismik, far offset, multiple, near offset, SRME, transformasi Radon

Judul: Biology and ecology of the buffalo fly, haematobia exigua de meijere (diptera:muscidae)
Abstrak: The life history of the buffalo fly was observed at room temperature of 27°-29.5°C and at a relative humidity of 48-68 percent. The eggs hatched after 17-22 hours, with an average of 18 hours. First instar larvae measured 1.25 + 0.16 mm long and 0.27 + 0.037 mm wide. reach the second larval stage. It took 6-12 hours to the second instar larvae measured 2.676 +0.187 mm long and 0.353 +0.028 mm wide. The second instar took about 12-24 hours to reach the third larval stage. The third instar measured 6.833 + 0.189 mm long and 0.919 + 0.051 mm wide. It took about 2-3 days for the third instar to become pupae. Duration of the pupal stage was about 5-7 days before the adults emerged. Under laboratory condition, the buffalo fly completed its life cycle in 9.5 to 10.5 days, whereas under field condition it took 9-14 days with an average of 10.5 days. The growth ratio which was based on the measurements of the cephalo-pharyngeal skeleton of each instar was 1.797. The preoviposition period was 8-12 days and mating usually occurred on the 6th or 7th day. The longevity of the male was 29 days, whereas it was 32 days in the female. The range of egg production under laboratory condition was between 20-139 per female fly. The belly and hind legs of the carabao were the most preferred habitat either during cloudy and cool dry or shiny and warm day. When the weather was clear and the carabao was in the shade, the flies tended to be more distributed particularly on the shoulder, dewlap, back and horns. The carabaos had relatively fewer Musca sp. and Stomoxys calcitrans than cattle; never the less carabaos had a higher infestation of buffalo fly than cattle. Oviposition occured either during the day or night but the buffalo flies were more active during the night than in the day time. The effect of various lengths of exposure time of manure in relation to the oviposition was profound. observed, the maximum number of the buffalo flies was occurred when the dung was exposed for 30 minutes. With increasing time of exposure the number and variety of insects also increase. It was evident that Sepsidae and psychodidae were the most dominant insects emerging from the dung. The number of buffalo flies also increased with increasing
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