Judul: Pine Oleoresin Tapping with Post-recovery Drill Method
Abstrak: Metode bor merupakan metode penyadapan dengan jangka waktu pemulihan relatif cepat sekitar 2-3 tahun. Salah satu lokasi yang mempunyai petak sadapan yang telah pulih adalah Hutan Pendidikan Gunung Walat. Lubang sadap bor yang telah pulih tertutup oleoresin dan telah mengeras hingga membentuk kulit dan kayu yang baru. Lubang sadap ini dapat terbuka kembali apabila dilakukan pengeboran ulang. Penelitian ini menggunakan ukuran mata bor 5/8 inci, 6/8 inci dan 7/8 inci sebagai perlakuan pascapemulihan. Selain itu dilakukan pengeboran bidang sadap baru pada pohon yang sama sebagai kontrol dengan ukuran mata bor yang sama. Hasil penelitian menunjukkan produktivitas oleoresin pinus pascapemulihan lebih rendah dibandingkan bidang sadap baru. Ukuran mata bor berpengaruh nyata terhadap produktivitas oleoresin pinus pascapemulihan. Ukuran mata bor 7/8 inci menghasilkan produktivitas paling tinggi, sehingga ukuran mata bor 7/8 inci dapat dijadikan solusi dalam penyadapan oleoresin pinus pascapemulihan. Kata kunci : oleoresin, pascapemulihan, produktivitas, ukuran mata bor, The drill method is a tapping method with a relatively fast recovery period, which is around 2-3 years. One of the locations that has recovered intercepts is the Gunung Walat Educational Forest. The recovered drill tapping holes are covered with oleoresin and have hardened so that it forms new bark and wood. This tapping hole can be re-opened if it is re-drilled. This study used drill bit sizes of 5/8 inch, 6/8 inch and 7/8 inch as post-recovery treatment. Beside that a new tapping area was drilled on the same tree as a control variable using the same drill bit size. The results showed that post-recovery pine oleoresin productivity was lower than the new tapping field. The size of the drill bit has a significant effect on the productivity of post-recovery pine oleoresin. The 7/8 inch drill bit provides the highest productivity, so that the 7/8 inch drill bit can be used as a solution in post-recovery pine oleoresin tapping. Keywords: drill bit size, oleoresin, post-recovery, productivity
Keyword: oleoresin, pascapemulihan, produktivitas, ukuran mata bor

Judul: Post-recovery Pine Tapping Productivity at KPH Bogor Regional Division of West Java and Banten Perum Perhutani
Abstrak: Permintaan produksi getah pinus terus meningkat, namun produksi getah pinus menurun. Salah satu penyebabnya yaitu karena tegakan pinus mengalami jenuh sadap (belum saatnya untuk ditebang namun bidang sadap sudah habis). Produktivitas getah pinus pascapemulihan yaitu sadapan pinus yang dilakukan pada bidang sadap yang telah mengalami penutupan luka belum diketahui. Penelitian ini bertujuan untuk mengukur persentase pemulihan bidang sadapan pinus metode quarre dan menganalisis produktivitas sadapan pinus pascapemulihan pada kedua kelas umur pohon. Rancangan percobaan yang digunakan adalah rancangan acak kelompok terdiri dari dua perlakuan yaitu sadapan pascapemulihan dan kontrol sedangkan kelompok yaitu tegakan pinus kelas umur (KU) IV dan IX. Hasil penelitian menunjukkan rata-rata pemulihan bidang sadapan pinus KU IX lebih tinggi dibandingkan KU IV. Rata-rata produktivitas getah pinus (g/pohon/hari) perlakuan pascapemulihan lebih rendah dibandingkan kontrol pada kedua kelas umur yaitu KU IV dan KU IX perlakuan pascapemulihan berturut-turut 8,11 g/pohon/hari dan 9,15 g/pohon/hari sedangkan perlakuan kontrol berturut-turut 11,42 g/pohon/hari dan 10,59 g/pohon/hari. Perlakuan (pascapemulihan dan kontrol) sadapan getah pinus menghasilkan produktivitas yang berbeda sedangkan kelas umur menghasilkan produktivitas yang sama., The demand for pine resin continues to increase along with the declining of pine resin production. One of the reasons is because the pine trees have become saturated with tapping (it is not proper yet to cut down, but the tapping fields have run out). Post-recovery pine resin productivity, namely pine tapping in a tapping area that had undergone closure of the tapping wound not yet known. This study aimed to measure the percentage of pine tapping field recovery using the quarre method and to analyze the productivity of post-recovery pine resin in both age classes of trees. The experimental design used a randomized block design consisting of two treatments, namely post-recovery and control, while the group consisted of pine stands of age class IV and IX. The results showed that the average recovery of the pine tapping field in age class IX was higher than age class IV. The average productivity of pine resin (g/tree/day) in post-recovery treatment was lower than the control in both age classes, namely age class IV and IX in post-recovery treatment, respectively 8.11 g/tree/day and 9.15 g/tree/day while the control treatments were 11.42 g/tree/day and 10.59 g/tree/day, respectively. Treatments (post-recovery and control) on tapped pine resin had a different productivity, while the groups (age class) had the same productivity.
Keyword: post-recovery, pine resin, productivity, tapping field recovery

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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