Judul: Pemodelan Penentuan Komposisi Produk untuk Memaksimalkan Keuntungan Perusahaan Jenang Kudus
Abstrak: Setiap perusahaan selalu mengharapkan keuntungan maksimal, meskipun pada umumnya sumber daya yang dimiliki terbatas. Hal ini juga terjadi pada PT Mubarokfood Cipta Delicia (PT MCD), sebuah produsen jenang kudus, makanan ringan khas kota Kudus. Saat ini ada 18 jenis produk jenang yang dihasilkan, dengan 12 variasi rasa. Satuan masing-masing produk adalah pak. Perusahaan akan menentukan berapa pak masing-masing produk harus dibuat (dalam bilangan bulat) agar keuntungan yang diperoleh maksimal. Masing-masing produk melalui proses produksi yang saling terkait. Tujuan penelitian ini adalah membuat model matematis dari permasalahan pemaksimalan keuntungan dengan keterbatasan yang ada, untuk menentukan komposisi produk pada PT MCD dengan menggunakan teknik pengoptimalan riset operasi. Penentuan komposisi produk agar diperoleh keuntungan maksimal diselesaikan dengan menggunakan metode Branch and Bound dengan bantuan software Lingo 10. Penelitian ini diharapkan bermanfaat karena merupakan penerapan matematika pada dunia usaha, juga dapat digunakan untuk membantu menentukan kebijakan perusahaan.
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Judul: Maksimisasi Keuntungan Melalui Kombinasi Produk Olahan Pisang Cv Al Barik
Abstrak: Kapasitas bahan baku dan sumber daya terbatas yang dimiliki perusahaan menjadi kendala dalam menentukan jumlah setiap jenis produk agar dapat dimanfaatkan secara optimal untuk mendapatkan keuntungan maksimal. Penelitian ini dilakukan untuk menganalisis maksimisasi keuntungan melalui kombinasi produk olahan pisang CV Al Barik yang berada di Bantul, Yogyakarta. Metode pemrograman linier digunakan untuk menghasilkan kombinasi produk optimal berdasarkan keterbatasan sumber daya yang dimiliki perusahaan, yaitu bahan baku, jam tenaga kerja dan jam mesin produksi, dengan bantuan software LINDO untuk penentuan keuntungan maksimal. Keuntungan maksimal yang diperoleh selama dua belas periode produksi sebesar Rp391 855 700 dengan memproduksi jenis produk kerupuk pisang dan keripik bonggol pisang.
Keyword: Keuntungan Maksimal, Kombinasi Produk, Pemrograman Linier

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