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: The Effect of Slopes on Soil Erosion in the Gap Planting Research Area of PT Sarmiento Parakantja Timber
Abstrak: Tanam Rumpang Tebang Rumpang (TRTR) merupakan sistem silvikultur yang diharapkan menjadi solusi peningkatan produktivitas hutan alam terdegradasi menggunakan teknologi tanam rumpang. Areal rumpang dimanfaatkan dengan menanam jenis pohon komersial setempat yang cepat pertumbuhannya dan berdaur pendek (5-8 tahun). Penelitian ini bertujuan untuk mengetahui pengaruh lereng terhadap erosi tanah yang terjadi akibat tanam rumpang. Penelitian dilakukan pada dua kelas lereng yakni kelas datar-landai dan kelas sedang. Hasil penelitian menunjukkan erosi tanah yang terjadi tertinggi pada areal simpukan, diikuti oleh erosi tanah di areal jalur tanam, dan yang terendah di areal hutan alam. Uji statistik menunjukkan bahwa erosi yang terjadi pada kondisi areal hutan alam, jalur simpukan dan jalur tanam tidak berbeda nyata. Pengaruh kelas lereng datar-landai dan kelas lereng sedang terhadap besarnya erosi di areal rumpang tidak berbeda nyata. Demikian pula besarnya erosi yang terjadi di areal rumpang dan di areal hutan alam terdegradasi juga tidak berbeda nyata., The gap planting and gap clear cutting (TRTR) silviculture system is projected to boost the productivity of damaged natural forests utilizing gap planting technology. The gap area is used by planting a local commercial fast-growing tree species with short-rotation (5-8 years). The goal of this study is to know how slopes affect soil erosion caused by gap planting. The study was conducted in two slope classes, namely the flat to sloping class and the medium class. The results showed that soil erosion occurred the highest in barrier areas, followed by soil erosion in planting path areas, and the lowest in natural forest areas. According to statistical analysis, there were no significant differences in the erosion that took place on planting path areas, barrier paths, and natural forest areas. The amount of erosion in the gap area is not considerably different depending on whether the slope is flat to sloping or medium. Similarly, the amount of erosion that occurs in the gap areas and in the degraded natural forest area is also not significantly different.
Keyword: Degraded natural forest, Gap planting, Soil erosion, Slopes

Judul: Penyelesaian Numerik Persamaan Schrödinger untuk Molekul BaO dan SrO Menggunakan Model Potensial Morse
Abstrak: Morse potential is a potential model used to describe the behavior of a molecular vibration between atoms. This study aimed to obtain the value of the dissociation energy, the energy eigenvalues of each energy level, and describe the shape of the wave function of the molecule BaO and SrO on the vibrational state. Dissociation energy is calculated by adding the experimental dissociation energy and the ground state energy eigenvalues. Calculating the energy eigenvalues of the energy levels 0 to 4 using shooting method integrated with Numerov and Runge-Kutta method. Energy eigenvalues of each levels that calculated numerically having accuracy of 100% compared with the calculated analytically. The profil of wave functions accurately show the corresponding states and their normalized wavefunctions.
Keyword: SrO, Morse potential, energy eigenvalues, dissociation energy, BaO