Judul: Analisis Biaya Penanaman Jabon Putih (Anthocephalus cadamba) di Areal Penelitian Tanam Rumpang PT. Sarmiento Parakantja Timber
Abstrak: Tanam rumpang merupakan salah satu metode yang digunakan dalam merehabilitasi hutan dan lahan. Tujuan dari penelitian ini adalah mengetahui biaya kegiatan penanaman jabon putih dalam rumpang pada areal penelitian tanam rumpang di areal IUPHHK-HA PT. Sarmiento Parakantja Timber. Metode yang digunakan dalam penelitian ini adalah metode time study dan analisis biaya. Hasil penelitian menunjukkan bahwa untuk menyelesaikan penanaman rumpang seluas 3.2 ha di dalam areal plot penelitian seluas 10 ha yang dilakukan 4-5 pekerja diperlukan waktu 36-37 hari. Tenaga kerja yang diperlukan untuk menyelesaikan penanaman rumpang adalah 32.58 HOK per ha. Rata-rata biaya aktual dan standar penanaman rumpang berturut-turut adalah Rp. 12.534.433,28 per ha dan Rp. 13.508.759,66 per ha. Proporsi biaya penanaman terbesar adalah penyediaan bahan untuk kegiatan penanaman, yakni sebesar 40.30%. Biaya total aktual dengan biaya standar memiliki perbedaan. Perbedaaan tersebut dikarenakan pada penentuan biaya standar dibedakan waktu efektif dan waktu tidak efektif serta penilaian rating performance dan allowance., Gap planting is one of the methods used in rehabilitation of degraded forest and land. The objective of this research was to determine the cost of planting white jabon in the research area of gap planting in the IUPHHK-HA PT. Sarmiento Parakantja Timber. The method used in this research were the time study and cost analysis methods. The results showed that to complete the gap planting of a 3.2 ha in an area of 10 ha of research plots carried out by 4-5 workers took 36-37 days. Labour needed to finish gap planting was 32.58 mandays. ha-1. Average the actual and standard cost of gap planting respectively were 12.534.433,28 Rp.ha-1 and 13.508.759,66 Rp.ha-1. The largest portion of planting costs is on planting materials for planting activities, namely 40.30%. Actual total costs and standard costs have differences. The difference is due to determination of standard costs to differentiate between effective and ineffective times as well as the assessment of performance ratings and allowances.
Keyword: biaya, penanaman, rehabilitasi hutan, tanam rumpang

Judul: Analisis Biaya Pemeliharaan Jabon Putih (Anthocephalus cadamba) pada Areal Penelitian Tanam Rumpang di PT Sarmiento Parakantja Timber Kalimantan Tengah
Abstrak: Tanam rumpang merupakan salah satu teknologi untuk merehabilitasi hutan. Tujuan dari penelitian ini adalah menganalisis biaya kegiatan pemeliharaan jabon putih dalam rumpang pada areal penelitian di PBPH PT. Sarmiento Parakantja Timber. Metode yang digunakan dalam penelitian ini terdiri dari metode time study, analisis biaya, dan uji statisik dengan Uji Independent sample t-test. Hasil penelitian menunjukkan bahwa untuk menyelesaikan pemeliharaan rumpang seluas 3,2 ha membutuhkan waktu 12–13 hari dengan jumlah pekerja sebanyak 3–4 orang. Tenaga kerja yang diperlukan untuk menyelesaikan pemeliharaan rumpang ini sebesar 8,5 HOK per ha. Rata-rata biaya aktual pemeliharaan tanaman dalam rumpang yaitu sebesar Rp3.188.301,61/ha, sedangkan biaya standarnya yaitu sebesar Rp3.360.602,96/ha. Proporsi biaya per tahapan yaitu pemupukan 74 %, Penyiangan 19%, dan Pendangiran 7%. Rumpang dengan topografi datar–landai dengan sedang mempengaruhi biaya total pemeliharaan standar, sedangkan biaya total pemeliharaan aktual tidak dipengaruhi kondisi topografi datar–landai maupun sedang., Gap planting is one of technology used in rehabilitation of degraded forest. The objective of this research was to analyze the costs of maintaining white jabon in gaps in the research area at PBPH PT. Sarmiento Parakantja Timber. The method used in this research consists of time study method, cost analysis, and statistical test with Independent sample t-test. The results showed that to complete the maintenance of a 3.2 ha gaps area, it took 12–13 days with a total of 3–4 workers. The labor required to complete the maintenance of these gaps is 8.5 HOK per ha. The average actual cost of plants maintenance in the gap area is Rp3.188.301,61/ha, while the standard cost is Rp3.360.602,96/ha. The proportion of costs per stage of plants maintenance are 74% fertilization, 19%, weeding and 7% post planting soil tillage. Gap planting in flat sloping topography and moderately area affects the total cost of standard maintenance, while the actual total cost of maintenance is not affected by flat or moderate topography.
Keyword: cost, maintenance, forest rehabilitation, gap planting

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology