Judul: Altitude And Shading Conditions Affect Vegetative Growth Of Kaempferia parviflora
Abstrak: Kaempferia parviflora is a native plant of Thailand which potentially developed in Indonesia because of its pharmacological values. Thus, in order to develop appropriate cultivation system of K. parviflora in Indonesia, this research was conducted to study the effect of different altitudes and shading conditions on the vegetative growth of K. parviflora. The experiment was arranged in Split-plot Nested design, where the main plot was altitude with two factors (1 200 m asl at Pasir Sarongge Experimental Farm and 240 m asl at Cikabayan Experimental Farm), the subplot was three levels of shading condition (0% shading, 55% shading, and natural shading), and replication was nested at subplot. The results showed that there was no significant different in plant height, number of leaves, and leaf area of K. parviflora grown at 1 200 m asl and 240 m asl respectively. However, higher altitude affects the color of K. parviflora leaves. Plants grown at higher altitude (1 200 m asl) had greener adaxial leaf color and more reddish abaxial leaf color than plants grown at lower altitude. The vegetative growth of K. parviflora was more affected by shading conditions. Kaempferia parviflora had taller plant, higher leaf area, and greener adaxial leaf color under natural shading than under full sun condition. Plants grown under natural shading and 55% artificial shading also had higher number of leaves at the early vegetative growth than those grown under full sun condition. Plants grown under 55% artificial shading showed similar growth with plants grown under natural shading, except that plants under natural shading had higher leaf area than plants grown under 55% artificial shading. The best combination between altitude and shading was of 240 m asl with natural shading. Based on the early vegetative growth, Kaempferia parviflora was shade plant that can be grown at 240 to 1 200 m asl without major difference.
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Judul: Aklimatisasi Kaempferia parviflora Wall. Ex. Baker pada Beberapa Komposisi Media Tanam dan Konsentrasi Paclobutrazol
Abstrak: Kaempferia parviflora is a medicinal plant which is highly valuable because of the bioactive compound in its rhizome, such as methoxyflavone. Conventional propagation of K. parviflora by splitting the rhizomes takes time because of long growing period prior to harvest and long period of rhizomes dormancy. Thus, rapid multiplication using in vitro culture is needed. The objective of this study was to obtain the optimum growing medium composition and paclobutrazol concentration suitable for K. parviflora acclimatization. This study was conducted from April to October 2013 and was arranged in a randomized completely block design with two factors and three replications. The first factor was growing medium composition (v/v) consisted of five levels i.e. 100% compost, 100 % charcoal husk, compost : charcoal husk = (1:1), compost : charcoal husk = (1:2), compost : charcoal husk = (2:1). The second factor was paclobutrazol concentration consisted of five levels i.e. 0, 1, 5, 10 and 15 ppm. The results showed that application of paclobutrazol at concentration up to 15 ppm had no significant effect on plant growth until 10 weeks after treatment (WAT). In contrast, growing medium composition significantly affected plant height, leaf length, leaf width, and leaf color. Plant growth on medium containing compost showed better growth than those grown in 100% charcoal husk medium.
Keyword: paclobutrazol., black galingale, compost, charcoal husk, acclimatization

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