Judul: Karakteristik infiltrasi tanah pada penggunaan lahan pertanian dan pemukiman di Desa Sukaresmi, Kecamatan Megamendung, Kabupaten Bogor.
Abstrak: The purpose of this research is to analyze soil infiltration characteristic and the main soil physical characters that influence to soil infiltration of several land uses, namely pine forest, vegetable garden, chilli garden, grasses land and resettlement area. Resettlement area has the highest soil bulk density (1,14 g/cm3) producing the lowest total pore space as compared to the others. The pore of resettlement area is dominated by hygroscopic pore (35,57 % v/v), whereas drainage pore is just 4,24 % (v/v). In pine forest, drainage pore is up to 19,85 % (v/v) and hygroscopic pore is up to 24,86 % (v/v). The amount of drainage pore in vegetable garden is 10,28 % (v/v) and its hygroscopic pore is 25,78 % (v/v). Drainage pore in chili garden is up to 17,17 % (v/v) and its hygroscopic pore is up to 17,35 % (v/v). In grasses land, the amount of drainage pore is 14,79 % (v/v) and its hygroscopic pore is 22,98 % (v/v). Infiltration rate of pine forest is the fastest rate, with average rate is up to 600 mm/hour that is classified as very fast rate according to Kohnke’s infiltration rate classification (1968), followed by chilli garden soil (180 mm/hour) and vegetable garden (140 mm/hour) that are classified as fast rate. Infiltration rate of grasses soil is classified as fast rate with average value is up to 136 mm/hour. The lowest infiltration rate occurs at resettlement area, where average infiltration rate is only 7,33 mm/hour that classified as medium-slow rate. The low average of soil infiltration rate at resettlement area is caused by soil compaction. Infiltration rate is mainly influenced by soil porosity, particularly by pore size distribution. At the beginning, infiltration rate is more governed by drainage pore while for constant infiltration rate is more influenced by finest pore, namely capillary pore and hygroscopic pore.
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Judul: Analisis Infiltrasi Tanah pada Berbagai Penggunaan Lahan di Kebun Percobaan Cikabayan, Dramaga
Abstrak: Infiltration rate of soil is influenced by a variety soil properties, such as soil texture, type of clay mineral, soil structure, aggregate stability, soil water content, soil organic matter content, soil pore distribution, and land use. The purpose of this study was to determine the infiltration rate of the soil on several land uses, and soil infiltration relationships with other soil properties, especially soil aggregate stability, organic matter content, and the content and type of cation. The result showed that the initial soil infiltration rate (t = 0,05 hour) was highest on Durian Garden 90 cm/hr, followed by Open Land 80 cm/hr, Cassava Garden 79 cm/hr, and the lowest in Rubber Garden 60 cm/hr. The initial soil infiltration rate is more determined by initial soil water content. Rubber Garden have the lowest soil infiltration rate because it has the highest initial soil water content. Cassava Garden has a constant infiltration rate of 7,80 cm/hr that classified as slightly fast. Infiltration rate constant on Rubber Garden 6,00 cm/hr, followed by Durian Garden 5,40 cm/hr, and Open Land have the lowest infiltration rate constant of 5,20 cm/hr which all classified as medium. Based on observations made soil infiltration rate is not always influenced by land use and some soil properties such as high aggregate stability, organic matter content, and exchangeable cation. Initial soil moisture condition controls initial soil infiltration rate. Tuber formation can loosen the soil so as to stimulate the movement of water into the ground to be faster.
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Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf