Judul: Pengaruh Frekuensi Air dan Pemupukan Kalium terhadap Pertumbuhan dan Produksi Kumis Kucing (Orthosiphon aristatus Miq)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh frekuensi pemberian air dan pemupukan kalium serta interaksinya terhadap pertumbuhan dan produksi kumis kucing (Orthosiphon aristatus Miq).
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Judul: Analisis Faktor-Faktor yang Memengaruhi Produksi Tanaman Kumis Kucing (Orthosiphon aristatus)
Abstrak: Kumis Kucing (Orthosiphon aristatus) is one of tropical medicinal plants that have many benefits, such as treating kidney stones inflammation, albuminuria, and also lowering blood glucose levels. Balittro as a research institution of spices and medicinal plants, began to research Kumis Kucing breeding in 2012 which aims to find the best accessions of Kumis Kucing among the six accessions. Path analysis is being used to achieve the research goal. Response variable under study is the value of production in the form of dry weight of plants with the value of production as the determinant variable and there are also fresh weight growth of leaf length, leaf’s width, leaf’s thickness, stem’s diameter, total leaves, total branches, total shoots, and plant water content. The result of path analysis based on the initial model showed that not all the determinant variables which are measured can influence the response variable. Modification of the model was conducted to determine the best model that describes variance of plants. Path iii analysis based on modified model could increased the variance between 8.10% to 20.29%. The results obtained indicate that the wet weight is the most dominant effect of the increase in dry weight.
Keyword: Kumis Kucing, path analysis

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