Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix

Judul: Determinan dan Invers Matriks Toeplitz Tridiagonal
Abstrak: Matriks merupakan susunan dari bilangan-bilangan yang diatur dalam kolom dan baris yang berbentuk persegi atau persegi panjang, salah satu jenis matriks adalah matriks Toeplitz. Matriks Toeplitz adalah matriks simetrik yang setiap unsur pada diagonal utamanya sama, dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga sama. Pada karya ilmiah ini diformulasikan cara hitung efisien untuk menentukan determinan dan invers matriks Toeplitz Tridiagonal. Formulasi determinan diberikan dalam bentuk eksplisit dan rekursif. Rumusan eksplisit diturunkan mengikuti pola binomial dan dibuktikan secara induktif. Sedangkan formula rekursif diperoleh dari mengamati struktur entri matriks tersebut. Pada akhirnya, formula rekursif ini menjadi dasar untuk merumuskan cara menghitung invers matriks Toeplitz Tridiagonal yang efisien., A matrix is an arrangement of numbers arranged in columns and rows in the form of a square or rectangle, one type of matrix is the Toeplitz matrix. The Toeplitz matrix is a symmetric matrix in which every element on the main diagonal is the same, and every element in the subdiagonal corresponding to the main diagonal is also the same. In this scientific paper, an efficient calculation method is formulated to determine the determinant and the inverse of the Tridiagonal Toeplitz matrix. The determinant formulation is given in an explicit and a recursive form. The explicit formula is derived from binomial patterns and the proof is based on inductive method. While the recursive formula is obtained from observing the structure of the matrix entry. In the end, this recursive formula becomes the basis for formulating an efficient way to calculate the inverse of the Tridiagonal Toeplitz matrix.
Keyword: Determinan, Invers, Matriks Toeplitz

Judul: Respons Pertumbuhan Tanaman Kelapa Sawit (Elaeis guineensisJacq.) Belum Menghasilkan Umur Dua Tahun terhadap Pemupukan Kalsium.
Abstrak: Oil palm is an annual plant which can produce Fresh Fruit Bunch (FFB) economically up to age 25years, it does necessary to maintenance vegetative growth to support generative phase. Fertilizing will improve soil fertility by provides essential nutrients. The objective of this experiment was to study response of Ca fertilizer of immature oil palm in age two year. The experiment was conducted from March 2014 to February 2015 at IPB-Cargill Teaching Farm of Oil Palm, Jonggol, Bogor, West Java, Indonesia. The experiment was arranged in randomized complete block design with one factor and replicated three times. The treatments were four rates of fertilizer as followed: without Ca as a control (Ca0), 600 g Ca plant-1 (Ca1), 1 200 g Ca plant-1 (Ca2), 2 400 g Ca plant-1 (Ca3). The results showed that application of Ca fertilizer increased the growth rate of plant height, but not had significant affect on stem girth, fronds production,frond length, leaf area, and physiological parameters.
Keyword: growth rate, physiology, soil nutrient availibility