Judul: Identifikasi lahan sagu dan potensi pemanfaatannya secara berkelanjutan di kabupaten Jayapura
Abstrak: Sago is one important alternative food diversification. Determination sago land as a sustainable food farming land needs to consider sago food needs, distribution, productivity and level of sago utilization. The purposes of this study are (1)To identify the food needs of local sago, (2)To identify of distribution and utilization of sago forest as other its utilization by people, and (3) To develop scenarios to determine the sago forest area that deserve to be recommended as sustainable agricultural food carried out in Jayapura Papua Province. The result showed there are four of vegetated sago area of 2909.8 ha of sago which is comprised of the Harapan area, Kehiran, Sosiri and Maribu. Types of sago based on habitat and cultivation consists of sago cultivation areas (dusun sagu), sago natural forest, sago swamps, and the sago mixture. Types of sago based on morphology diversity just on dusun sagu area while in other areas only forest sago (mano/manino). The highest productivity is the Kehiran region with clump density 711 clump/ha and 133 stands ready for harvest/ha. Use type of sago utilization is same for all areas only on the intensity of their use are different. Requirement sago land for the consumption of sago in location of research and contribution to the Jayapura regency is sufficient from of sago land existing. 950.1 ha of sago cultivation areas for LP2B plan, especially development on the fringes of Sentani Lake. 1.508,3 ha of potential sago land for LCP2B plan other than those already proposed for plan of LP2B areas. KP2B includes LP2B, LCP2B, sago swamps and supporting elements of an area of 2.458,4 ha.
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Judul: Sago (Metroxylon sagu Rottb.) Agroforestry Design Based on Morphological Characters, Physical Environment and Productivity in National Siberut Park
Abstrak: Sagu (Metroxylon sagu Rottb.) merupakan tumbuhan penghasil pati tertinggi dengan kandungan karbohidrat 94 g per 100 g. Potensi sagu dapat mengatasi permasalahan kekurangan pangan nasional dan mengurangi ketergantungan masyarakat terhadap beras. Tujuan penelitian yaitu menganalisis karakter morfologi, fisik lingkungan dan produktivitas sagu untuk mendapatkan rancangan agroforestri sagu berkelanjutan di kawasan Taman Nasional Siberut. Metode yang digunakan yaitu observasi dan analisis vegetasi. Fisik lingkungan habitat sagu terbagi menjadi dua kategori lahan, yaitu lahan lembab dan lahan basah. Karakter morfologi sagu (ukuran, bentuk dan jumlah) lebih unggul di Kecamatan Siberut Utara. Sagu siap panen, umumnya memiliki tinggi batang 8-10 m. Produktivitas sagu di Kecamatan Siberut Utara dan Kecamatan Siberut Barat masing masing menghasilkan 16,88 ton/ha dan 14,69 ton/ha. Rancangan agroforestri berbasis sagu yang direkomendasikan menggunakan jarak tanam 10 x 10 m yang menghasilkan tegakan sagu ideal sekitar 100 pohon/ha/tahun. Tumbuhan pendukung agroforestri, antara lain pangan, obat, rotan manau serta ternak lebah dan ikan., Sago is the highest starch-producing plant with a carbohydrate content of 94 g per 100 g. Potential of sago can overcome the problem of national food shortages and reduce peoples dependence on rice. Purposes the study were to analyze of morphological characters, physical environment and productivity of sago to obtain a sustainable sago agroforestry design in the Siberut National Park area. Methodsused were observation and vegetation analysis. Physical environment of the sago habitat wasdivided into two categories of land, moist land and wetlands. Morphological characters of sago (size, shape and total) were superior in North Siberut District. Sago is ready to harvested, generally has a stem height of 8 - 10 m. Sago productivity in North Siberut and West Siberut sub-districts produced 16,88 tons/ha and 14,69 tons/ha. Recommended sago-based agroforestry designed uses a spacing of 10 x 10 m which produces an ideal sago stand of around 100 trees/ha/year. Supporting plants for agroforestry include food, medicine, manau rattan as well as beekeeping and fish.
Keyword: agroforestry, morphological characters, physical environment, productivity

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