Judul: Disain Penjumlah BCD (Binary Coded Decimal Adder) dengan 4 Input Data BCD dan 4 Digit Tampilan (Display)
Abstrak: Dalam proses pengolahan bahan-bahan dan hasil pertanian, aktivitas pengukuran dan penghitungan ~nerupakan ha1 yang lazim ditemui. Seringkali dalam proses produksi terdiri dari beberapa jalur proses (multi-line) yang inemerlukan hasil total dari semua jalur produksi yang ada. Solusi sederhana yang dipakai adalah menggunakan alat penjumlah seperti kalkulator, namun bagi industri yang proses produksinya kontinyu ha1 ini tidak efektif dan efisien sebab memerlukan waktu dan tenaga penghitung dalam mengerjakannya. Kebanyakan alat-alat ukur dan hitung digital menggunakan sistem bilangan biner yang dikodekan untuk merepresentasikan bilangan desimal atau yang lebih dikenal dengan BCD (Binaly Coded Decimal). Disain alat penjumlah BCD me~upakan sebuah solusi dalam ~nengatasi masalah di atas. Alat ini diharapkan marnpu melakukan penjumlahan secara cepat dan tepat untuk beberapa jalur produksi khususnya proses produksi yang bersifat kontinyu. Dalam bidang pertanian, aplikasi alat ini tentu saja diperlukan. Pertanian dalam bidang perikanan misalnya, peralatan ini dapat diaplikasikan untuk menjumlahkan hasil dari berbagai alat penghitung bibit ikan secara digital. Aplikasi alat ini tidak difokuskan pada bidang pertanian saja namun diperluas ke bidang-bidang lain yang memerlukan penjumlahan secara digital.
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Judul: Disain Prototipe Alat Penghitung Bibit Lele Dumbo (Clarias fuscus) secara Digital
Abstrak: Untuk meningkatkan produkstifitas hasil perikanan darat dibutuhkan teknologi yang maju. Teknologi yang mampu memecahkan masalah yang dihadapi dalam budidaya perikanan. Budidaya ikan lele dumbo ( C l a r i a s fuscus) sangat berpotensi uxtuk dikenbangkan, karena ikan lele dumbo banyak digemari masyarakat, kandungan gizi yang tinggi, pemeliharan yang mudah dan nurah, pertumbuhan yang cepat dan memiliki nilai yanp ekonomis yang tinggi. Dalam budidaya ikan lele dumbo mssih banyak ditemukan kendala, salah satunya adzlah proses penghitungan bibit lele dumbo yar.g cukup sulit dan kurang akurat. Karena itu dibutuhkan suatu alat hitung yang mamapu menghitung secara tepat dan akurat.
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Judul: Phylogeography and Species Limits in the Papuan White Snake (Micropechis ikaheka) (Reptilia: Serpentes: Elapidae)
Abstrak: Papua white snake, Micropechis ikaheka, has been distingushed into two subspecies M.i. ikaheka and M.i. fasciatus. However, due to lack of data on their morphology, distribution and ecology, both subspecies often ignored in scintific discussions and refers only byas , Micropechis ikaheka. This study was designed to document the differences between M.i. ikaheka and M.i fasciatus by using scales characteristics and reproductive organ or hemipenes. The study also examine, zoogeography, habitat, diet and cannibalism of both subspecies to better understanding the the ecology of one of the most venomous snakes in the world. This study consists of three topics with method and also different in the size samples, respectively. The first study is the histology and microtopography of the skin were studied using paraffin method and Scanning Electron Microscope (SEM). The second is the hemipenis were examined by following Myers and Cadle (2003), and Zaher and Prudente (2003). The third is the abdominal surgery was carried out to document diet type and the investigate phenomenon of cannibalism in the snake. Specimens for this study came from the collection from Museum Zoologicum Bogoriense (MZB) and Universitas Negeri Papua’s Laboratory (LZU). The research result also indicated that the markers of skin and hemipenis described the same structure and microornamentation in all M. ikaheka groups being compared. Based specimens examined morphological descriptions do not s support the further differentiation in Micropechis. In short, two markers that used in this study could not sufficiently indicate the differences in the level of species and subspecies of M. ikaheka. The study, however, were able to delineate zoogeography and skin color patterns, which fall into four groups: M. i. ikaheka; M. i. fasciatus. M. i. ssp. “intermediate”; and M. i. ssp “black”. This study also revealed that color variations did not overlap in their geographic distribution. It is therefore, it suggested that environmental factors may contribute to the skin color variations. It also assumed that habitat discontinuous and biogeography factors may also cause the loss of the connection between the original populations (vicarians) or follow colonization events (dispersal). The examined of 22 stomach contents of M. ikaheka shows this species is carnivorous, and prey on vertebrates such as amphibians, fish, reptiles, and Mammals. These snakes are opportunistic predators since they prey on all that can be captured, but mainly reptiles (61.5%), followed by mammals and fish (both 15.4%), and amphibians (7.7%). Although categorized as terrestrial animal, the diet study showed that M. ikaheka snakes often go into the water to hunt for fish (the sample from Yapen island), including eel (the sample from Aru island). Based on prey items indentified, there is evidence that M. ikaheka is cannibal. At this time, there still no record on reason for cannibalism, but it is assumed that cannibalism was due to competition between populations and means to control population.
Keyword: geographic variation, white snake, papua