Judul: Pengaruh Aksi Korporasi dan Kapitalisasi Pasar dalam Pembentukan Portofolio Optimal Saham di Bursa Efek Indonesia
Abstrak: Investor sering kali membentuk portofolio dengan saham yang berasal dari emiten yang belum melakukan aksi korporasi saja dan tidak sedikit investor yang kurang memperhatikan kapitalisasi pasar dari saham pembentuk portofolionya. Tujuan penelitian ini adalah menguji proporsi dan komposisi portofolio optimal; menganalisis pengaruh kapitalisasi pasar dalam posisi optimal portofolio; dan memproyeksi tingkat pertumbuhan jangka panjang dari portofolio optimal yang dibentuk dari seluruh saham dan saham non-corporate action. Metode analisis yang digunakan adalah model Markowitz. Alat analisis yang digunakan yaitu microsoft excel 2010. Hasilnya, portofolio optimal kapitalisasi A dan A* memberikan pengembalian yang diharapkan 10% per tahun; risiko 3,16% per tahun dan 4,8% per tahun; pertumbuhan 9,95% per tahun dan 9,89% per tahun. Portofolio optimal kapitalisasi B dan B* memberikan pengembalian yang diharapkan 50% per tahun dan 19% per tahun; risiko 0,00148% per tahun dan 0,000011% per tahun; pertumbuhan 50% per tahun dan 19% per tahun. Portofolio optimal kapitalisasi C dan C* memberikan pengembalian yang diharapkan 90% per tahun dan 27% per tahun; risiko 28,97% per tahun dan 0,609% per tahun; pertumbuhan 90% per tahun dan 27% per tahun.
Keyword: aksi korporasi, kapitalisasi, portofolio optimal

Judul: Analisis Portofolio Optimal pada Saham Sektor Finansial yang terdaftar di Bursa Efek Indonesia
Abstrak: Karakteristik saham sektor finansial adalah kepekaannya terhadap perubahan suku bunga yang berdampak pada harga saham sektor tersebut. Namun, tiap subsektor finansial memiliki tingkat kepekaan tersendiri tehadap suku bunga. Kondisi tersebut menunjukkan perlunya komposisi portofolio yang optimal untuk saham sektor finansial agar dapat menarik banyak investor. Penelitian ini bertujuan untuk: (1) Mengetahui kondisi saham perusahaan sektor finansial (2) Menganalisis perkembangan harga saham sektor finansial (3) Menghasilkan portofolio investasi optimum, tingkat return, alokasi dana, dan risiko dari portofolio tersebut. Penelitian ini menggunakan data sekunder dari perusahaan sektor finansial tahun 2011-2015 dengan teknik pemilihan sampel purposive sampling yang dianalisis menggunakan Model Indeks Tunggal. Hasil penelitian menunjukkan bahwa komposisi portofolio yang terbentuk adalah seluruh saham dari objek penelitian, (kecuali AHAP, BFIN, BBCA, BNBA, MFIN, BBRI, GSMF, BMRI, VRNA, dan BBNI) dikarenakan tidak memenuhi kriteria nilai ERB>Ci.
Keyword: Model indeks tunggal, portofolio optimal, saham, sektor finansial

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