Judul: Simulasi Eliminasi Odor Gudang Beku dengan Teknik Kabut Ozon Nanobubble berbasis Visual Basic Microsoft Excel
Abstrak: Salah satu permasalahan umum pada gudang beku yang menggunakan sistem mixed storage adalah cemaran odor. Perubahan odor pada suatu produk dapat mengindikasikan penurunan mutu produk. Teknik kabut ozon nanobubble telah terbukti dapat menghilangkan VOC penyebab odor, sehingga dipilih sebagai solusi penghilang odor. Hasil dari pengujian lab menunjukkan bahwa kabut ozon nanobubble memiliki efektifitas sebesar 63% selama 3 jam. Teknik ini divalidasi dengan eksperimen di lingkungan skala lab kemudian ditingkatkan ke lingkungan skala industri dengan simulasi perangkat lunak. Simulasi menggunakan model persamaan yang didapat dari slope-intercept. Program simulasi eliminasi odor pada gudang beku berisi visualisasi yang mampu menggambarkan keadaan odor pada gudang beku ketika diberi perlakuan kabut ozon nanobubble. Simulasi menggunakan Bahasa pemrograman VBA pada Microsoft Excel. Hasil dari simulasi peningkatan skala eliminasi odor menunjukkan efektivitas dari kabut ozon nanobubble sebesar 52%.
Keyword: old storage, nanobubble ozone mist, odor, VBA

Judul: Simulasi dan Rekapitulasi Biaya Eliminasi Odor Gudang Beku dengan Teknik Gabungan Ozon Nanobubble dan Karton-Aktif
Abstrak: Odor merupakan salah satu permasalahan umum pada gudang beku yang bersistem mixed storage. Produk dengan karakteristik mengeluarkan odor kuat berpotensi menyebabkan penurunan mutu terhadap produk yang tersimpan di sekitarnya. Terdapat dua solusi yang dapat diimplementasikan pada gudang beku untuk mengurangi cemaran odor, yaitu karton aktif dan kabut ozon nanobubble. Program simulasi skala industri dibuat menggunakan Visual Basic pada Microsoft Excel. Model logaritma digunakan dalam simulasi untuk mendapatkan nilai dari skala laboratorium ke skala industri. Simulasi skala industri menggunakan ruang penyimpanan 600 m3 . Hasil pengujian kinerja ozon dengan efektivitas terbaik pada lama penyimpanan 24 jam memiliki nilai sebesar 96% dengan kebutuhan ozon sebanyak 1.332 ml dan massa produk berjumlah 4 ton. Intensitas penanganan odor sebanyak dua (12 jam) hingga tiga kali (8 jam) akan meningkatkan efektivitas eliminasi odor, namun hal ini menyebabkan kebutuhan akan ozon lebih banyak. Penambahan jumlah arang aktif dengan menggunakan kemasan boks sekunder, tidak efektif dalam penerapannya. Biaya dalam penggunaan kedua metode eliminasi odor ini dihitung berdasarkan pengklasifikasian jenis biaya, yaitu biaya investasi, biaya variabel dan biaya tetap.
Keyword: ozon mist nanobubble, cold storage, active cardboard, odor, VBA

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