Judul: Tinjauan Matematis pada Model Makroskopik dan Mikroskopik Arus Lalu-lintas
Abstrak: Traffic flow phenomenon can be described through mathematical model such as continuous dynamic model with an ordinary differential equation so that it can be solved with integral factors. In this paper three simple models of traffic flow are discussed, i.e, two macroscopic and one microscopic models. Macroscopic model formulates dynamics of the traffic flow that occurs on a large number of vehicles on a road. While the microscopic model explains drivers’ behavior in their interaction with other vehicles ahead, i.e, car-following model. This paper shows the existence of ordinary differential equation found in the traffic flow model and indicates some different representations in the context of the same model. It also reviews a simple model of traffic flow along a single link, which leads to some unexpected results, i.e, it can express the solution model in term of link outflows as well as trip time. In the microscopic model, simulation is done to illustrate the behavior of the drivers with a sensitivity coefficient as a benchmark parameter.
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Judul: Analisis Sistem Dinamik Lalu Lintas dengan Model Mobil Pengikut
Abstrak: A mathematical model can be formulated to study and solve certain real problem, such as traffic problem. In this manuscript, a nonlinear car-following model that includes a reaction-time delay of drivers in a circular road was discussed and the analysis of its linear stability was performed. Moreover, the characteristic equation on equilibrium state was investigated. Based on the uniformly flow solution, boundaries of Hopf bifurcations were determined in the complex parameter space. Furthermore, a simulation on traffic dynamics was also performed. The simulation result shows that there exists a slight change of linear stability, when the sensitivity parameter changes
Keyword: Bogor Agricultural University (IPB), time delay., stability analysis, Hopf bifurcation, car-following model

Judul: Peremajaan Kelapa Sawit (Elaeis guineensis Jacq.) di Seruyan Estate, PT Indotruba Tengah, Minamas Plantation Group, Seruyan, Kalimantan Tengah.
Abstrak: Kegiatan magang ini dilaksanakan di Seruyan Estate, PT Indotruba Tengah dari Februari hingga Juni 2016. Kegiatan magang ini bertujuan untuk mempelajari aspek teknis dan manajerial peremajaan kelapa sawit dan menganalisis kesesuaiannya dengan kriteria RSPO dan ISPO saat kegiatan replanting. Pengamatan yang dilakukan meliputi tahap-tahap peremajaan yang tepat berdasarkan standar yang telah ditetapkan perusahaan, prestasi kerja alat, dan prestasi kerja karyawan. Hasil pengamatan tersebut kemudian dianalisis secara deskriptif berdasarkan standar yang berlaku pada kegiatan peremajaan. Hasil pengamatan menunjukkan bahwa tahap peremajaan dibagi menjadi dua tahap, yaitu tahap persiapan lahan yang meliputi sensus pokok, pancang rumpuk, penumbangan, pencincangan, merumpuk pokok, deboling, tutup lubang deboling, pembuatan jalan kontur; dan tahap penanaman yang meliputi pemancangan titik tanam, penanaman kacangan penutup tanah, pembuatan lubang tanam, dan penanaman tanaman kelapa sawit. Seruyan Estate telah memenuhi kriteria RSPO dan ISPO dikarenakan adanya kewajiban mengelola area Nilai Konservasi Tinggi di dalam kebun. Selain itu, kegiatan peremajaan di Seruyan Estate juga tidak menggunakan api saat melakukan persiapan lahan.
Keyword: konservasi, persiapan lahan, prestasi kerja