Judul: Soil Erosion Study in Gap Planting Research Area at PT. Intracawood Manufacturing
Abstrak: Sistem silvikultur Tanam Rumpang Tebang Rumpang (TRTR) merupakan salah satu upaya yang dapat diterapkan untuk mengembalikan fungsi lahan hutan yang mengalami degradasi. Sistem ini digunakan untuk merehabilitasi hutan alam yang rusak dengan penanaman fast growing species lokal non-Dipterocarpaceae maupun Dipterocarpaceae di areal rumpang. Penelitian ini bertujuan untuk mengetahui pengaruh dari tanam rumpang terhadap besarnya erosi tanah. Hasil penelitian menunjukan bahwa areal blok tanpa perlakuan memiliki nilai berat tanah tererosi terbesar. Areal blok perlakuan mengalami penimbunan. Uji statistik menunjukan bahwa besarnya erosi di areal rumpang yang diberi perlakuan tidak berbeda nyata terhadap besarnya erosi di areal rumpang tanpa perlakuan, besarnya erosi di areal rumpang yang diberi perlakuan tidak berbeda nyata terhadap besarnya erosi di hutan alam, dan besarnya erosi di areal rumpang tanpa perlakuan tidak berbeda nyata terhadap besarnya erosi di hutan alam., The silvicultural system of Gap Planting and Gap Felling (TRTR), is one of method that can be applied to restore the function of degraded forests. This system is used to rehabilitate damaged forests by planting of local fast-growing species of non-Dipterocarpaceae or Dipterocarpaceae in the gap. This study aims to determine the effect of gap planting on erosion rates. The results showed that natural forest in block area without treatment has the largest soil erosion weight rate. The treatment block area was piled up. Statistical analysis showed that the amount of erosion in the treated gap plot was not significantly different from the amount of erosion in the untreated gap plot, and the amount of erosion in the treated gap plot was not significantly different from the amount of erosion in natural forest, and the amount of erosion in the untreated gap plot was not significantly different from the amount of erosion in natural forests
Keyword: Degraded forest, gap planting, silviculture, soil erosion

Judul: Soil Erosion Study in The Gap Planting Research Area at PT Intracawood Manufacturing
Abstrak: Suatu fenomena alam yang mengakibatkan pengikisan tanah disebabkan faktor-faktor diantaranya iklim, topografi, vegetasi, tanah, dan manusia. Tanam Rumpang Tebang Rumpang (TRTR) merupakan salah satu sistem Silvikultur dengan teknik meniru proses suksesi dan permudaan alam di hutan alam yang masih terus dikembangkan. TRTR merupakan upaya yang dapat diterapkan untuk mengembalikan produktivitas areal hutan alam yang tidak berpotensi dan mengembalikan fungsi lahan hutan yang mengalami degradasi. Penelitian ini bertujuan untuk mengetahui tingkat erosi tanah dengan sistem TRTR pada kondisi areal hutan alam, jalur tebas, dan jalur tanam. Hasil penelitian menunjukan bahwa areal blok tanpa perlakuan memiliki nilai berat tanah tererosi terbesar. Hasil uji statistik menunjukan bahwa besarnya erosi di blok areal rumpang yang diberi perlakuan tidak berbeda nyata terhadap besarnya erosi di blok areal rumpang tanpa perlakuan, besarnya erosi di blok areal rumpang yang diberi perlakuan tidak berbeda nyata terhadap besarnya erosi di hutan alam, dan besarnya erosi di blok areal rumpang tanpa perlakuan berbeda nyata terhadap besarnya erosi di hutan alam., A natural phenomenon that results in soil erosion due to factors including climate, topography, vegetation, soil, and humans. Gap Planting and Gap Cutting (TRTR) is one of the silviculture systems using techniques that mimic the process of succession and natural regeneration in natural forests that are still being developed. TRTR is an effort that can be applied to restore the productivity of natural forest areas that have no potential and restore the function of degraded forest land. This study aims to determine the level of soil erosion with the TRTR system in the condition of natural forest areas, slash lanes, and planting lanes. The results showed that the block area without treatment had the largest eroded soil weight value. Statistical test results showed that the amount of erosion in the treated block was not significantly different from the amount of erosion in the block area without treatment, the amount of erosion in the treated block area was not significantly different from the amount of erosion in the natural forest, and the amount of erosion in the block area without treatment was significantly different from the amount of erosion in the natural forest.
Keyword: areal tanam rumpang, erosi tanah, hutan alam, sistem silvikultur

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
Keyword: