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"A numerical ocean modeling study using spectral element method is used to simulate the Indian Ocean Kelvin wavepropagation along the Makassar Strait and the Sulawesi Sea by giving a-prescribed-50-day Kelvin wave forcing in thenorthern mouth of the Lombok Strait. The least square fit analysis is employed to extract a-50-day-resonant signal fromthe interface height data simulation. The results indicate that the 50-day Kelvin wave propagates northward along theMakassar Strait. One part of this wave turns back at the Labani channel and makes southward propagation along theeastern coast of the Makassar Strait. The rest part is going further to enter the Sulawesi Sea and makes 50-day resonancewithin the basin. This finding will have important implication on the intra-seasonal time scale variability of theIndonesian throughflow transport entering the Indonesian Seas and needs further investigation as well as comparisonwith observational data."

"Telah dilakukan penelitian mengenai perilaku lumba-lumba hidung botol (Tursiops aduncus) di Ocean Dream Samudra (ODS) Jakarta Utara pada tanggal 18 Juni 2015–8 Juli 2015. Tursiops aduncus dikenal sebagai hewan yang memiliki kemampuan beradaptasi yang tinggi terhadap kondisi lingkungan sekitarnya. Hal tersebut memungkinkan Tursiops aduncus dapat bertahan hidup pada habitat buatan. Penelitian bertujuan untuk menghitung proporsi waktu aktivitas harian dan menganalisis bentuk-bentuk perilaku adaptasi Tursiops aduncus di kolam Underwater Theater ODS, serta merujuk perilaku di habitat alaminya. Penelitian dilakukan dengan metode focal animal sampling dengan interval waktu 10 menit tanpa jeda. Individu yang diamati adalah empat ekor Tursiops aduncus jantan bernama Kuning, Ungu, Biru dan Specta yang terdapat pada kolam Underwater Theater ODS. Hasil penelitian menunjukkan persentase perilaku travelling dan perilaku feeding tertinggi ditunjukkan oleh Kuning (65,71%) dan (0,2%), persentase perilaku resting dan perilaku playing paling tinggi ditunjukan oleh Specta (25,68%) dan (2,67%), serta persentase social interaction dan sexual aggression tertinggi ditunjukan oleh Ungu (15,35%) dan (4,94%). Meskipun kondisi pada habitat buatan berbeda dengan habitat aslinya, Tursiops aduncus mampu menyesuikan diri melalui perubahan perilaku yang terlihat pada masing-masing perilaku yang terjadi dan masih mempertahanklan perilaku alaminya.

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The behavioural study of Indo Pacific Bottlenose Dolphins Tursiops aduncus at the Ocean Dream Samudra Ancol North Jakarta had been done Tursiops aduncus known as animals that have high adaptability to the environmental conditions This adaptability allows Tursiops aduncus to survive on an artificial habitat The purpose of this research were to calculate the proportion of time budget in a daily activity and analyze forms of behavioural adaptation of Tursiops aduncus in the Underwater Theater ODS and also refers to their natural behaviour Method used in this study is focal animal sampling with interval of time 10 minutes continuously Objects on this study are four male Tursiops aduncus named Kuning Ungu Biru and Specta in the Underwater Theater pool ODS The result on this study is showed that the highest presentation of travelling and feeding behaviour are showed by Kuning 65 71 and 0 2 highest presentation of resting and playing behaviour are showed by Specta 25 68 and 2 67 also highest presentation of social interaction dan sexual aggression behaviour is showed by Ungu 15 35 and 4 94 Although the conditions in the artificial habitat different with the naturally habitat Tursiops aduncus is able to adapt through changes in behavior that observed at each behavior happened and still preserving it rsquo s natural behaviour."

"[Pesatnya pertumbuhan ekonomi dan penduduk di daerah pesisir menjadikan kebutuhan akan ruang yang lebih luas sehingga reklamasi kawasan pesisir menjadi pilihan utama yang banyak ditempuh Pemanfaatan pasir laut yang berlebihan dan tidak terkendali dapat mengganggu ekosisitem bahkan merusak daya dukungnya Penelitian ini mengkaji gangguan pada produktivitas perairan Teluk Banten Kabupaten Serang yang disebabkan kegiatan penambangan pasir laut di tahun 2004 2015 Masalah penelitian adalah belum adanya kajian ilmiah lingkungan mengenai pengaruh penambangan pasir laut di Teluk Banten Penelitian ini menggunakan pendekatan kuantitatif dengan metode kuantitatif dan kualitatif Data fisik dianalisis menggunakan korelasi dan regresi polinomial orde 2 dan data wawancara dianalisis dengan metode deskriptif Hasil penelitian memperlihatkan hubungan yang kuat r 0 9835 antara penambangan pasir laut dengan peningkatan kekeruhan perairan Teluk Banten dengan persamaan regresi y x 90 8494 9 2392 10 3 x 1 3059 10 7 x2 Penambangan pasir laut juga signifikan mengurangi produktivitas perairan Teluk Banten r 0 9726 dengan persamaan regresi y x 2 948 3 21 10 7 x ndash 8 26 10 14 x2 Hasil penelitian juga memperlihatkan persepsi negatif masyarakat nelayan terhadap aktivitas penambangan pasir laut Menurut mereka penambangan pasir laut berdampak pada aktivitas penangkapan ikan karena tidak dapat menangkap ikan di perairan dekat desa mereka lagi.

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A rapid economic and population growths in urban coastal areas may followed by an expansion of space Mostly the expansion is applying a coastal reclamation An uncontrollable and overexploitation of marine sand for coastal reclamation may disturbing the ecosystem and even cause damage to its carrying capacity This research is finding the disturbance of marine productivity in Banten Coastal Bay Serang District which is caused by marine sand mining activity in 2004 2015 According to preliminary finding there is no scientific studies about the impact of marine sand mining activity in Banten Coastal Bay yet This research is using quantitative approach with quantitative and qualitative method The physical aspect has been analyzed using statistically correlation and 2nd order of polynomial regression Interview data which is analyzed by a descriptive method somehow providing some clues The result shows the strong correlation r 0 9835 between marine sand mining production and the increasing of water turbidity in Banten Coastal Bay which represent by a regression equation y x 90 8494 9 2392 10 3x 1 3059 10 7x2 Marine sand mining production is also significant reduce r 0 9726 the marine productivity of Banten Coastal Bay which represent by a regression equation y x 2 948 3 21 10 7x ndash 8 26 10 14x2 It is found in the fisheries community that they have a negative perception to the marine sand mining activity According them those mining activities impacting to their fishing tradition They cannot catch the fish in the near shore around their livinghood anymore ;A rapid economic and population growths in urban coastal areas may followed by an expansion of space Mostly the expansion is applying a coastal reclamation An uncontrollable and overexploitation of marine sand for coastal reclamation may disturbing the ecosystem and even cause damage to its carrying capacity This research is finding the disturbance of marine productivity in Banten Coastal Bay Serang District which is caused by marine sand mining activity in 2004 2015 According to preliminary finding there is no scientific studies about the impact of marine sand mining activity in Banten Coastal Bay yet This research is using quantitative approach with quantitative and qualitative method The physical aspect has been analyzed using statistically correlation and 2nd order of polynomial regression Interview data which is analyzed by a descriptive method somehow providing some clues The result shows the strong correlation r 0 9835 between marine sand mining production and the increasing of water turbidity in Banten Coastal Bay which represent by a regression equation y x 90 8494 9 2392 10 3x 1 3059 10 7x2 Marine sand mining production is also significant reduce r 0 9726 the marine productivity of Banten Coastal Bay which represent by a regression equation y x 2 948 3 21 10 7x ndash 8 26 10 14x2 It is found in the fisheries community that they have a negative perception to the marine sand mining activity According them those mining activities impacting to their fishing tradition They cannot catch the fish in the near shore around their livinghood anymore.;A rapid economic and population growths in urban coastal areas may followed by an expansion of space Mostly the expansion is applying a coastal reclamation An uncontrollable and overexploitation of marine sand for coastal reclamation may disturbing the ecosystem and even cause damage to its carrying capacity This research is finding the disturbance of marine productivity in Banten Coastal Bay Serang District which is caused by marine sand mining activity in 2004 2015 According to preliminary finding there is no scientific studies about the impact of marine sand mining activity in Banten Coastal Bay yet This research is using quantitative approach with quantitative and qualitative method The physical aspect has been analyzed using statistically correlation and 2nd order of polynomial regression Interview data which is analyzed by a descriptive method somehow providing some clues The result shows the strong correlation r 0 9835 between marine sand mining production and the increasing of water turbidity in Banten Coastal Bay which represent by a regression equation y x 90 8494 9 2392 10 3x 1 3059 10 7x2 Marine sand mining production is also significant reduce r 0 9726 the marine productivity of Banten Coastal Bay which represent by a regression equation y x 2 948 3 21 10 7x ndash 8 26 10 14x2 It is found in the fisheries community that they have a negative perception to the marine sand mining activity According them those mining activities impacting to their fishing tradition They cannot catch the fish in the near shore around their livinghood anymore , A rapid economic and population growths in urban coastal areas may followed by an expansion of space Mostly the expansion is applying a coastal reclamation An uncontrollable and overexploitation of marine sand for coastal reclamation may disturbing the ecosystem and even cause damage to its carrying capacity This research is finding the disturbance of marine productivity in Banten Coastal Bay Serang District which is caused by marine sand mining activity in 2004 2015 According to preliminary finding there is no scientific studies about the impact of marine sand mining activity in Banten Coastal Bay yet This research is using quantitative approach with quantitative and qualitative method The physical aspect has been analyzed using statistically correlation and 2nd order of polynomial regression Interview data which is analyzed by a descriptive method somehow providing some clues The result shows the strong correlation r 0 9835 between marine sand mining production and the increasing of water turbidity in Banten Coastal Bay which represent by a regression equation y x 90 8494 9 2392 10 3x 1 3059 10 7x2 Marine sand mining production is also significant reduce r 0 9726 the marine productivity of Banten Coastal Bay which represent by a regression equation y x 2 948 3 21 10 7x ndash 8 26 10 14x2 It is found in the fisheries community that they have a negative perception to the marine sand mining activity According them those mining activities impacting to their fishing tradition They cannot catch the fish in the near shore around their livinghood anymore ]"

"ABSTRAKPemetaan kondisi laut yang dimulai dari penemuan metode tomogra? laut akustik oleh Munsk et al [1] mengalami perkembangan akibat perkembangan dunia pemrosesan digital yang sangat pesat. Penelitian ini membahas sebuah sistem tomogra? modern dengan sistem digital, menggunakan sebuah mikroprosesor untuk melakukan pemrosesan data dengan metode korelasi dari data yang dibaca oleh suatu instrumen pembacaan suara yakni hidrofon. Bagian yang menjadi fokus penelitian ini adalah perancangan rangkaian analog front-end yang terdiri dari pre-ampli?er dan ?lter dari sebuah hidrofon kapasitif tipe AQ-1 dengan spesi?kasi respons frekuensi 1-10kHz untuk mengganti sistem yang sudah ada berbasis AQ-201 dan Hydrophone Amp yang dirancang oleh Badan Pengkajian dan Penerapan Teknologi. Penelitian ini menyoroti penggunaan penguat hibrid berbasis JFET Op-amp untuk perancangan pre-ampli?er yang memiliki penguatan minimum 26 dB dengan derau yang rendah. Sebuah umpan balik tegangan seri negatif juga diimplementasikan pada rangkaian pre-ampli?er untuk memperbaiki performa dari desain pre-ampli?er secara signi?kan. Setelah itu dirancang sebuah ?lter Bessel dengan rentang frekuensi dari 0.1Hz-10kHz dengan topologi Sallen-Key. Telah berhasil dirancang dan dibangun sebuah rangkaian analog front-end dengan frekuensi operasi pada 1 - 10 kHz dengan derau lebih rendah dari referensi yakni sebesar 8.25 nV/Hz0.5.

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ABSTRACTOcean condition mapping which started with the discovery of an ocean acoustic tomography by Munsk et al 1 has seen growth due to the rapid development of digital processing eld. This study is based on a modern tomography system that uses a digital system such as microprocessors to process data using correlation of data acquired by a sound receiver instrument that is known as a hydrophone. This study focuses on the design and implementation of an analog front end circuit that consists of a pre ampli er and lter of a capacitive hydrophone AQ 1 with speci ed frequency response of 1 10kHz to replace existing system based on AQ 201 and a Hydrophone Amp designed by Badan Pengkajian dan Penerapan Teknologi. This study highlights the usage of a hybrid JFET Op amp Ampli er topology to design a pre ampli er with gain at least 26 dB with lower noise than 100nV Hz0.5. A voltage series negative feedback is implemented in this pre ampli er circuit to improve the noise performance of the pre ampli er design signi cantly. Afterwards, a lter is designed with Bessel characteristics with frequency range of 0.1Hz to 10kHz with Sallen Key topology. An analog front end has been designed and built with an operating frequency within the range of 1 10kHz with lower noise than that of referenced ampli er with a value of 8.25 nV Hz0.5."

"ABSTRAKThe water-wave interaction with submerged breakwaters is examined to determine the reflection and transmission coefficients. Three types of breakwaters are considered, namely, a submerged breakwater extending from the sea bed until below the waterline, a breakwater extending from above the seawater to some distance below, and a breakwater extending all the way from the seabed with slit at some distance from the bed. In all three cases the breakwaters are assumed to be rigid, thin, and impermeable, and subjected to linear monochromatic waves, and the fluid motion is idealized as linearized, two-dimensional potential flow. A computationally efficient method - an eigenfunction technique with a mixed boundary condition - is used to determine the velocity potential anywhere in the region of flow. The least-square method has been utilized in the solution for the mixed boundary condition. The accuracy of the solution is demonstrated by comparing the numerical values for the transmission coefficient with those obtained from experiments or other analytical solutions but with water depth restrictions. Numerical results in terms of both reflection and transmission coefficients are presented for each case."