Judul: Determinan dan Invers Matriks Skew Circulant dengan Entri Lucas Numbers
Abstrak: Matriks skew circulant adalah matriks berukuran n×n yang setiap entri dari baris sebelumnya bergeser satu kolom ke kanan pada baris berikutnya secara berurutan diikuti dengan perubahan tanda pada semua entri dibawah diagonal utama, sehingga untuk mengetahui entri matriks skew circulant dapat dilihat dari satu baris matriks tersebut. Entri-entri pada matriks skew circulant dapat diisi dengan berbagai entri yang membentuk barisan bilangan, salah satunya yaitu Lucas Numbers. Karakteristik persamaan Lucas Numbers dapat digunakan untuk menentukan determinan dan invers matriks skew circulant. Pada karya ilmiah ini akan ditentukan determinan dan invers matriks skew circulant dengan entri Lucas Numbers dengan membuat matriks transformasi dan menggunakan beberapa teorema dan lemma., Skew circulant matrix is a matrix of size n×n where each entry from the previous row shifts one column to the right in the next row sequentially followed by a change in sign to all the elements below the main diagonal, so to find out the entries of the skew circulant can be seen from one row of the matrix. The entries in the skew circulant matrix can be filled with various entries that form a sequence of numbers, one of which is Lucas Numbers. Characteristics of the equation Lucas Numbers can be used to determine the determinant and inverse of the skew circulant matrix. In this scientific work, will be determined the determinant and inverse of skew circulant matrix with Lucas Numbers by constructing a transformation matrix and using several theorems and lemma.
Keyword: Lucas numbers, skew circulant matrix, determinant, inverse

Judul: Metode OBD dan OKD dalam Menentukan Determinan dan Invers Matriks Skew Circulant dengan Entri Bilangan Lucas
Abstrak: Matriks skew circulant adalah matriks persegi dengan entri baris pertama (a_1,a_2,⋯,a_(n )) dan baris selanjutnya entri akan bergeser satu kolom ke arah kanan secara berurutan dengan seluruh entri sebelum diagonal utama akan bernilai negative. Entri-entri matriks skew circulant dapat menggunakan entri berbagai bilangan, salah satunya adalah bilangan Lucas. Karakteristik persamaan Lucas Number dapat digunakan untuk menentukan determinan dan invers matriks skew circulant. Pada karya ilmiah ini diformulasikan determinan dan invers matriks skew circulant dengan entri bilangan Lucas. Pembuktian formulasi determinan suatu matriks skew circulant diperoleh dari penerapan serangkaian operasi baris dasar sehingga diperoleh matriks segitiga atas, sedangkan pembuktian formulasi inversnya diperoleh berdasarkan sifat-sifat ekuivalensi matriks hasil kombinasi operasi baris dasar dan operasi kolom dasar., The Skew Circulant matrix is a square matrix with the first-row entry (a_1,a_2,⋯,a_n) and the next row of entry will shift one column to the right in sequence and all entry before the main diagonal will be negative. The entry of the skew circulant matrix can be an entry of various numbers, in this paper, we used the Lucas number. The characteristics of the Lucas Number can be used to determine the determinant and the inverse of the circulant skew matrix. In this research, the determinant and inverse of the skew circulant matrix with the Lucas numbers entries are formulated. The proof of the determinant formulation of the skew circulant matrix Lucas number is explained by applying a series of elementary row operation to get the upper triangular matrix, while the proof of the inverse formulation is explained on the equivalence properties of the matrix resulting from the combination of base row operations and base column operations.
Keyword: Circulant Skew Matrix, Determinant, Inverse, Lucas Number

Judul: Electrophoretic Coating of Apatite Compouds on Stainless Steel 316L.
Abstrak: Stainless steel (SS) 316L is a metal which is used to bone plate. However, this metal still has low biocompatibility in a human body. The metal is coated by HAp in order to increase its biocompatibility. HAp on SS 316L is coated by electrophoretic deposition (EPD) method. We used two variables in EPD process, such as voltage and coating time to obtain the best coating. The XRD difractogram showed that SS 316L has been coated by HAp. Physical observation used by microscope optics showed that the best coating is achieved on 120V during 2 minutes.
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