Judul: Crabs Diversity (Decapoda: Brachyura) in the Maya and Karimata Islands Waters, North Kayong Regency, West Kalimantan.
Abstrak: Pulau Maya dan Pulau Karimata terletak di Selat Karimata yang merupakan titik bertemunya empat aliran massa air yaitu Laut Natuna Utara, Selat Malaka, Selat Sunda dan Laut Jawa. Kami menduga wilayah ini memiliki keanekaragaman biota laut yang tinggi khususnya kepiting (Decapoda: Brachyura). Kepiting Brachyura merupakan kepiting sejati yang memiliki empat pasang kaki jalan yang berkembang dengan baik dan sepasang kaki pertama berkembang menjadi capit. Penelitian ini bertujuan mendeskripsikan dan mengelompokkan keanekaragaman kepiting (Decapoda: Brachyura) di perairan Pulau Maya dan Karimata Kabupaten Kayong Utara, Kalimantan Barat. Sampling kepiting dikoleksi dengan berbagai cara yaitu, tangkap langsung dengan tangan, hand net dan pukat nelayan dengan metode purposive sampling. Sampel difoto dan kemudian difiksasi dalam alkohol 70% sekitar 24 jam selanjutnya sampel disimpan di alkohol 96%. Identifikasi menggunakan website internet dan buku identifikasi. Sebanyak enam belas spesies Brachyura ditemukan terdiri dari famili Ocypodidae, Portunidae, Grapsidae, Xanthidae, Leucosiidae, Varunidae dan Gecarcinucidae. Enam spesies ditemukan di Pulau Karimata dan sepuluh spesies ditemukan di Pulau Maya. Seulocia latirostrata dan Lyphira ovata merupakan laporan distribusi pertama dari laut Indonesia., Maya Island and Karimata Island are located in the Karimata Strait, which is the meeting point of four mass flows of water, namely the North Natuna Sea, the Malacca Strait, the Sunda Strait and the Java Sea. We suspect this area has a high diversity of marine life, especially crabs (Decapoda: Brachyura). Brachyura crab is a true crab that has 4 pairs of well-developed walking legs and the first pair of legs develops into claws. This study aims to describe and classify the diversity of crabs (Decapoda: Brachyura) in the waters of Maya Island and Karimata, North Kayong Regency, West Kalimantan. Sampling of crabs was collected in various ways, namely, direct capture by hand, handnet and fishing trawler by purposive sampling method. Sample was photographed and then fixed in 70% alcohol for about 24 hours, then the sample was stored in 96% alcohol. Identification using internet websites and identification books. A total of sixteen species of Brachyura were found consisting of the families Ocypodidae, Portunidae, Grapsidae, Xanthidae, Leucosiidae, Varunidae dan Gecarcinucidae. Six species were found on Karimata Island and ten species were found on Maya Island. Seulocia latirostrata and Lyphira ovata are the first distribution records from the Indonesian sea.
Keyword: Brachyura crabs, decapoda, diversity, Karimata Strait, purposive sampling

Judul: Exploration of Crab (Crustacea: Decapoda: Brachyura) from the East Coast, North Sumatera
Abstrak: Crustacea merupakan hewan invertebrata yang memiliki tingkat migrasi yang tinggi. Kemampuan migrasi ini terjadi pada fase larvanya yang mengikuti arus dan akan menetap pada habitat yang cocok. Pantai Timur Sumatera yang berada di antara Selat Malaka dan Sungai Deli diprediksi memiliki keanekaragaman kepiting yang tinggi. Penelitian ini bertujuan mengeksplorasi dan mendeskripsikan keanekaragaman kepiting di kawasan Pantai Timur, Sumatera Utara. Metode yang digunakan adalah convenience sampling yaitu teknik pengambilan sampel didasarkan pada ketersediaan dan kemudahan mendapatkan sumber data. Penelitian ini dilakukan pada 4 stasiun penelitian dan sampel difiksasi pada alkohol 70% selama satu 24 jam, selanjutnya disimpan menggunakan alkohol 96% dan satu bulan kemudian alkohol 96% diganti yang baru. Kepiting diidentifikasi menggunakan FAO Species Identification Guide for Fishery Purpose. Hasil sampling didapatkan sebanyak 192 individu, terbagi kedalam 6 famili dan 21 spesies. Famili tersebut terdiri dari Sesarmidae (7 spesies), Ocypodidae (7 spesies), Portunidae (4 spesies) , Macrophthalmidae (1 Spesies), Varunidae (1 spesies) , dan Camptandriidae (1 spesies). Kata kunci : belawan, convenience sampling, larva, selat malaka, Crustaceans are invertebrate animals that have a high migration rate. This migratory ability occurs in the larval phase, which follows the current and will settle in a suitable habitat. The East Coast of Sumatra, which lies between the Strait of Malacca and the Deli river, is predicted to have a high diversity of crabs. This study aims to explore and describe the diversity of crustaceans in the Belawan International Port area, North Sumatra. The method used is convenience sampling, the sampling technique is based on the availability and ease of obtaining data sources. This study was conducted at 4 research stations and samples were fixed in 70% alcohol for one 24 hours, then stored within 96% alcohol relaced with new one. Samples identified using the FAO Species Identification Guide for Fishery Purposes. Sampling results obtained as many as 192 individuals, divided into 6 families and 21 species. The family consists of Sesarmidae (7 species), Ocypodidae (7 species), Portunidae (4 species), Macrophthalmidae (1 species), Varunidae (1 species), and Camptandriidae (1 species). Keywords: belawan, convenience sampling, larva, strait of malacca
Keyword: belawan, convenience sampling, larva, strait of malacca

Judul: Pembuatan Sel Surya Berbasis Film Ferroelektrik Barium Strontium Titanate (Ba0,5Sr0,5TiO3)
Abstrak: Growth of films Ba0,5Sr0,5TiO3 (BST) 1 M has been done with variation of annealing in hold time 8 hours, 15 hours, 22 hours, and 29 hours at constant temperature 8500C, above Si (100) substrate p-type, by using the sol-gel process method which followed with spin coating process at 3000 rpm for 30 seconds. Optics spectroscopy shows that BST film solar cells with annealing hold time 8 hours, 15 hours, and 22 hours, works effectively in wavelength ≥ 700 nm absorption range. Yet for sample with annealing hold time about 29 hours effectively absorb in ≤ 700 nm wavelength range. It obtained BST film refractive index at range 2.0 to 7.0 to wavelength range ±370-870 nm. Band gap BST film value based on annealing hold time 8 hours, 15 hours, 22 hours, and 29 hours respectively 2.60 eV; 3.12 eV: 3.24 eV, and 2.66 eV. Electrical conductivity value which obtained, indicate that the BST film is classified as semiconductor material with conductivity order 10-5-10-4 S / cm. The result of I-V photovoltaic characterization shows the BST film potentially to be a solar cells device with efficiency according to the annealing hold time 8 hours, 15 hours, 22 hours, and 29 hours in a row are 2.68x10-5%, 3.51x10-5%, 4.53x10-5% and 3.22x10-5%
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