Judul: Menentukan Nilai Eigen Real Matriks Menggunakan  Metode Dekomposisi Adomian
Abstrak: Matriks adalah kumpulan bilangan berbentuk persegi panjang menurut baris dan kolom. Salah satu hal yang umum dibahas dari matriks adalah pencarian nilai eigen. Mencari nilai eigen matriks pada dasarnya adalah menentukan akar dari polinom karakteristik. Terdapat kerumitan ketika mencari akar dari polinom berderajat lebih dari empat. Oleh sebab itu, pada karya ilmiah ini pencarian akar dari polinom karakteristik menggunakan Metode Dekomposisi Adomian . Inti dari metode ini adalah mendekomposisi variabel yang diinginkan kedalam deret tak hingga sehingga hasil yang didapatkan berupa pendekatan nilai. Dari hasil percobaan terhadap beberapa contoh matriks berukuran dan didapatkan beberapa keunggulan seperti galat yang relatif kecil, konvengensi yang cepat dan nilai awal yang sudah ditentukan., A matrix is a collection of rectangular numbers according to rows and columns. One of the things that is commonly discussed from matrices is the search for eigenvalues. Finding the eigenvalues of a matrix is basically finding the roots of the characteristic polynomial. There is a problem with finding the roots of polynomials of degree greater than four. Therefore, in this scientific work, the search for the roots of characteristic polynomials uses the Adomian Decomposition Method. The essence of this method is to decompose the desired variable into an infinite series so that the results obtained are in the form of a value approach. From the experimental results on several examples of sized and matrices and obtained several advantages such as relatively small errors, fast convergence and predefined initial value.
Keyword: Error, Adomian Decomposition Method, eigen values, characteristic polynomials

Judul: Perhitungan Nilai Eigen Terkecil dari Matriks Toeplitz Simetrik Real dan Definit-Positif dengan Metode Single Newton
Abstrak: Suatu metode yang paling luas digunakan untuk mencari hampiran akar dari suatu fungsi adalah metode Newton. Tujuan dari karya ilmiah ini adalah menghitung nilai eigen terkecil dari matriks Toeplitz simetrik real dan definit-positif dengan menggunakan metode single Newton. Polinomial karakteristik dan turunan polinomial karakteristik sangat dibutuhkan dalam melakukan iterasi pada metode ini. Untuk menunjukkan kebenaran dari rumus-rumus yang digunakan dalam metode Newton seperti nilai eigen, polinomial karakteristik, dan turunan polinomial karakteristik, maka diberikan ilustrasi serta metode analitik untuk matriks yang berorde 2 dan 3. Hasil perhitungan nilai eigen terkecil dari suatu matriks, dalam hal ini matriks Toeplitz simetrik real dan definit-positif, yang ditentukan dengan menggunakan metode single Newton sesuai dengan metode analitik.
Keyword: matriks definit-positif Toeplitz, metode Newton, nilai eigen

Judul: Amfibi sebagai satwa peliharaan: Ekspor, Impor dan Perdagangan Domestik
Abstrak: Indonesia has exported amphibian as frozen frog legs (listed since 1969 under fishery product) for consumption and live amphibian (listed since 1983 under reptilian class in forestry product) for pets. There are also live amphibian trading in local level i.e in markets and malls. This research aims to identify amphibian species exported and imported by investigating document from related administration and to identify amphibian species traded in domestic market by observation at Jakarta. Research is primarily conducted by processing quota data taken from Department of Forestry Republic of Indonesia database in Jakarta. Market observation was carried out in 18 locations (3 markets and 15 malls) in Jakarta. I carried out interview with trader and export business, which related to net trading live amphibians for pets. Respondent was choosen using snowball sampling manner. Name of species is written according to Iskandar & Coljin (2000). If there is no such record in the checklist (for example species are from outside Indonesia), then the species name is written according to Frost (2004). There are 56 species from eight families of wild amphibians that have pets quota between 1998-2008. Nineteen species was traded since 1983. The highest export quota is Litoria caerulea (21,37%). Allocation of highest catching quota is for BKSDA Jayapura (20,40%) and BKSDA Papua Barat (18,96%). Four species are included in IUCN Red List categories as vulnerable, among others are Limnonectes macrodon, Meristogenys jerboa, Nyctixalus margaritifer and Rhacophorus margaritifer. The number of amphibians that have export realization are 39 species. Two species of amphibian, Leptobrachium hasseltii and Rhacophorus margaritifer are amphibian species whose been known infected by chytrid fungus in the wild. The biggest species exported is Litoria caerulea (54,34%). Between 1983-1991, the biggest import amphibian for pets from Indonesia (66,13%) is Netherlands. Number of quota was relative stable in the last eight years, where as the number of export realization is more fluctuates. Amphibian species imported and re-exported between 1983-2008 come from Africa, South Asia, Malaysian, Archipelago Oceania, North America, Central America and South America. The number of pet amphibian species traded at domestic market is less than exported. Data showed that Indonesia imports 15 amphibian species between 1983-2008, However I found different species in the market that was unrecorded in the Ministry of Forestry data, which is the Fire Belly Salamander.
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