Judul: Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Adolina, PT Perkebunan Nusantara IV, Serdang Bedagai, Sumatera Utara.
Abstrak: Internship aims to improve the ability and comprehension in the management of oil palm plantation. Internship implemented in Adolina Estate, PTPN IV. In the implementation of internship, harvest management in the oil palm harvesting was accentuated to observed and studied. Observation in harvest management consists of harvest rotation, harvest density, assessed daily production, harvester requirements, criteria of ripe harvest, harvester capacity, quality fruit, and transporting the fruit to oil palm mill. Data from observation were analyzed quantitatively using the average, percentage, and standard deviation (descriptive statistics) as well as the t-student test (comparison). The results from analyzed showed that harvest management of oil palm in Adolina Estate need to be improved. It is due to harvester capacity is lower of standard company and the high production percentage of fruits have not quality. The low capacity of harvesters affect the calculation of harvester requirements and disruption of harvest rotation. Harvest rotation is disturbed affect the high production percentage of fruits have not quality. Adolina Estate has implemented assessed harvest density quite accurately to the realization of the harvest density. The accuracy of the assessed harvest density to realization of harvest density affect the accuracy of the assessed daily production as well as calculation of harvester requirements and transport harvest.
Keyword: harvester capacity, harvest management, oil palm, harvester

Judul: Manajemen Panen Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun Adolina PTPN IV Persero, Serdang Bedagai, Sumatera Utara
Abstrak: Internship program provides knowledge and skills in aspects agronomy of oil palm, both technical and managerial. This internship activities were started from February 2014 to June 2014 at Adolina Estate PTPN IV Persero, Serdang Bedagai, North Sumatera. Intership activities included, worker in the field as laborer, as supervisor and field manager. Management of harvesting included harvester, harvest capacity, harvest quality, and production as well as productivity of the palm. Secondary data were collected form literature and field devision archives such as monthly and annuals reports, as well as documentation of the field activities. Generally the needs of the harvester in Adolina Estate has been sufficient, but the quality and capacity of the harvest still low. Ripe fruits were not harvested and there were still many loosed fruits which has not been collected in the field. The production and productivity of palm per year of transplanting is not based on target. Better quality harvester and more intensive control by supervisor will improve quality and quantity of harvest.
Keyword: Bogor Agricultural University (IPB), oil palm., harvest management, Adolina Estate

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.
Keyword: