Judul: Sistem Persamaan Linear Pada Aljabar Max-Plus Dan Solusinya
Abstrak: Aljabar max-plus adalah himpunan bilangan real ℝmax = ℝ ∪ {ϵ} yang memenuhi operasi penjumlahan ⊕ dan operasi perkalian ⊗. Aljabar max-plus dapat digunakan untuk menyelesaikan masalah sistem persamaan linear. Sistem persamaan linear pada aljabar max-plus dapat diselesaikan dengan metode matriks diskrepansi. Matriks diskrepansi adalah matriks dengan semua batas atas dari xi dan xi dapat ditemukan dengan cara mengambil minimum kolom ke-j dari matriks tersebut. Metode matriks diskrepansi pada aljabar max-plus digunakan untuk menyelesaikan sistem persamaan linear dengan matriks ukuran n × n dan m × n dimana m < n dan m > n dalam (ℝmax, ⊕, ⊗) sehingga didapatkan sistem persamaan linear pada aljabar max-plus ada yang memiliki satu penyelesaian, penyelesaian tak hingga, ataupun tanpa penyelesaian. Di dalam karya tulis ini ditunjukan bahwa Sistem Pesamaan Linear pada aljabar max-plus dengan matriks ukuran n × n dan m × n, dengan m > n yaitu ada yang memiliki satu penyelesaian, tak hingga penyelesaian ataupun tanpa penyelesaian. Namun Sistem Pesamaan Linear pada aljabar max-plus dengan ukuran matiks m × n, dengan m < n hanya memiliki tak hingga penyelesaian atau tanpa penyelesaian., The max-plus algebra is real numbers of the set ℝmax = ℝ ∪ {ϵ} which is the equipped of additional operation (⊕) and multiplication operation (⊗). Max-plus algebra can be used to solve a problem of system of linear equations. The system of linear equations in max-plus algebra can be solved by the discrepancy matrix method. The discrepancy matrix is a matrix with all the upper bounds of the xi's and that each xi can be found by taking the minimum of the jth column of the matrix. Discrepancy matrix method of the max-plus algebra is used to solve a problem of system of linear equations with matrix n × n and m × m where m < n dan m > n in (ℝmax, ⊕, ⊗) so that there are system of linear equations in max-plus algebra that have one solution, infinite solution, or no solution. In this article is shown that system of linear equations in max-plus algebra with matrix n × n and m × n where m > n that have one solution, infinite solution, or no solution. However the system of linear equations in max-plus algebra with matrix m × n where m < n only have infinite solution or no solution.
Keyword: max-plus algebra, system of linear equations, discrepancy matrix  method

Judul: Metode Kaczmarz untuk menyelesaikan sistem persamaan linear
Abstrak: A system of linear equations is often involved in science and engineering problems. There are many methods available for solving system of linear equations, both analytically and numerically. Kaczmarz method is one of iterative methods for solving such system. Orthogonal projections are used in this method. The sequence of approximate solutions generated by algorithm for this method is convergent for an arbitrary initial solution. A proof of the convergence is given. If the system of linear equations is consistent, then the sequence of approximate solutions converges to the exact solution. This shows that Kaczmarz method is a good method. Implementation of this method is done using MATLAB R2008b. Some systems of linear equations are generated, and then solved numerically using the program. The results show that the more iteration used in the solution approximation, the smaller norm of residual obtained.
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Judul: Populasi dan Habitat Kakatua-Kecil Jambul-Kuning di Bentang Alam Mbeliling Bagian Barat, Kabupaten Manggarai Barat, Nusa Tenggara Timur
Abstrak: Cacatua sulphurea parvula or yellow-crested cockatoo were spread distributed at Sunda Kecil Archipelago, Nusa Tenggara, except at Sumba Island. This species amount in the nature is very small, caused by the illegal hunting and trading. The purpose of this research is to get the information about population and habitat of the cockatoo in Flores, especially at the western part of Mbeliling Landscape. Cocatoo census was conducted by look-down method at vantage points when cockatoo flew passed by. Habitat analysis was carried out with vegetation analysis. The census showed that there were two groups of cockatoo, consisted of 69 cockatoos in Tao hill and 15 cockatoos in Nggoer River. Flight pattern of each group ranged 0-100 meters above the sea level and crossed mangrove forest, savanna, monsoon forest and cultivation plant vegetation. The vegetation analysis resulted Ceiba petandra or silk-cotton tree as the tree that most used by cockatoo and had the highest TIV (Tree Importance Value), 47,48%. Cockatoo’s foods which observed were crown flower (Calotropis gigantea), and Moringa olifera. The population of Cockatoo which observed at western part of Mbeliling Landscape was estimated came from Rinca Island, Komodo National Park. It can be concluded that the location might be only used by rhe cockatoo came from Rinca Island as their daily exploration area for foraging.
Keyword: habitat., ecology, population, Flores, Cacatua sulphurea parvula