Judul: Pengelolaan Lahan Gambut di Perkebunan Kelapa Sawit di Kebun Teluk Bakau, PT Bhumireksa Nusa Sejati, Minamas Plantation, Riau
Abstrak: Internship was conducted at the Teluk Bakau Estate, PT Bhumireksa Nusa Sejati (BNS), Riau in order to follow the practise of the company in managing peatland for oil palm crop, as well as to study the water management system of estates. Activity was carried out for 4 months from February to June 2013. Target of water level at PT BNS plantation commonly is in range 25 to 50 cm below the ground surface. Drainage system in PT BNS consists of main canals, branch canals, new branch canals, collection canals, collection trenches, middle trenches, and field drain. The efforts to maintaining the water level are building up water zoning, installing piezzometers, water gates, over flow gates, water flows, building up emergency gates, installing spillway, treating canals, and making maps and standard operational procedure of water management system. Simple linear regression analysis was used to estimate the effect of rainfall to water level. Result showed that the rainfall significantly (p value = 0.014) affected the water level. Increasing 1% of the rainfall would increase the water level by 0.06899% below the ground surface. Multiple linear regression analysis was used to estimated the effect of rainfall and water level to production. Results showed that the rainfall and the water level did not affect the production. Most of the water levels at Teluk Bakau Estate are controlled well. Most of the drainage system conditions are good and can be passed by conveyance of water. Water management system is managed well.
Keyword: water management, water level, Riau, drainage

Judul: Harvest  management  of  palm  oil  (elaeis  guineensis  jacq.)  in  teluk  bakau  estate,  pt  bhumireksa  nusa  sejati  minamas  plantation, riau
Abstrak: Kegiatan magang dilaksanakan di Kebun Teluk Bakau, PT Bhumireksa Nusa Sejati Minamas Plantation, Riau dari 10 Februari hingga 10 Juni 2014. Pelaksanaan kegiatan magang bertujuan untuk memperoleh pengalaman kerja, keterampilan dan pengetahuan khususnya pengetahuan kultur teknis tanaman kelapa sawit. Secara khusus kegiatan magang bertujuan untuk mempelajari pengelolaan panen melalui proses kegiatan panen, menganalisis permasalahan dan memecahkan masalah. Secara keseluruhan proses kegiatan panen untuk menghasilkan produksi TBS (Tandan Buah Segar) di Kebun Teluk Bakau berjalan dengan baik. Pelaksanaan panen yang efisien dipengaruhi oleh taksasi produksi, cuaca pada saat pelaksanaan panen, tingkat kematangan buah, rotasi panen, sistem pengangkutan hasil panen dan karyawan panen. Proses kegiatan angkut tandan buah segar di Kebun Teluk Bakau menggunakan jalur air. Saat proses pengangkutan masih terdapat kehilangan hasil pada buah dan brondolan. Pengawasan intensif terhadap karyawan merupakan salah satu langkah untuk menekan kehilangan hasil panen, The internship was conducted in Teluk Bakau Estate, PT Bhumireksa Nusa Sejati Minamas Plantation, Riau from February 10 th to June 10 th 2014. The purpose of internship is to get experience of work, skill and knowledge especially the technical culture of palm oil. In specifically, the purpose of internship is to learn management of harvesting by processing of harvesting activity, analyze of problem and solve problem. Process of harvesting activity that produced the fresh fruit bunch in the Teluk Bakau Estate had been good. There are some factors which influenced palm oil harvesting, they were prediction of production, weather in harvesting, fruit ripeness, harvested rotation, transportation and the labor. The harvesting activity in Teluk Bakau Estate used water transportation. There was still the losses during process of transportation. The intensive control to the labor was one of the measures to depress the losses
Keyword: panen, kehilangan hasil panen, produksi

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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