Judul: Manajemen Panen Kelapa Sawit : Hubungan Mutu Buah dan Curah Hujan Terhadap Kandungan Asam Lemak Bebas di Kebun Rambutan PTPN III Sumatera Utara
Abstrak: Internship activitywas conducted in order to increase knowledge, skills, and experience in the oil plantation, as well as to study relationship between harvest management and content of free fatty acid (FFA). Activities were carried out from February to June 2014 at the Rambutan Estate of PTPN III in North Sumatera Province. Effects of fruit quality and precipitation on FFA were analyzed by using multiple linier regression models. Results showed that FFA content significantly affected by percentage of delayed-processed bunches (restan) (P value = 0.087). Increasing level of delayed-processed bunches at rate of 1% (kg) increased FFA level of 0.001%. Percentage of over ripe, unripe and under ripe fruits and precipitation did not significantly affect FFA level. This research implies that control of delayed-processed bunch is important to maintain level of FFA.
Keyword: Bogor Agricultural University (IPB), restan-fruit, general linier model, free fatty acid, crude palm oil

Judul: Palm Oil (Elaeis guineensis Jacq.) Harvest Management at Kebun Rambutan PTPN III, Serdang Berdagai, North Sumatera
Abstrak: Palm oil is a commodity with high economic value because it can produce oil that has many use. Harvest is one part of the production system in oil palm plantations that connects oil palm plantations and factory such as harvesting fruit from trees and transporting it to the factory. The internship was carried out at Kebun Rambutan, PTPN III, North Sumatera, from January 2020 to April 2020. This activity aims to train motoric skills, gain experience in the field, and learn proper management of the harvest system in oil palm plantation. Things that will be observed were harvest planning, harvest implementation, and harvest evaluation. Data analysis method used were quantitative and qualitative methods and statistical analyzed by the t–student test and correlation test. The harvest rotation have not yet meet the company standard. Realization of the amount of labor needed to harvest is not corresponding with the estimation, but this shortage can still be covered by the large output of each harvester. Harvesting activities are suitable with the company standards, which is variant below 5 %. The use of personal protective equipment (PPE) is good enough, the use of protective goggles must be increased again. Cutting fruit stems into the shape of the letter V must be increased. The quality of the fruit was 97.05 % out of 100 %, which is below the company standards. The average load of the transported-fruit still exceeds the capacity of the transport. Correlation test shows that there is a low correlation pecentage between productivity and rainfall.
Keyword: oil palm, angka kerapatan panen, produktivitas, curah hujan

Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik