Judul: Teknik pemanfaatan anakan alam puspa (Schima Wallichii (DC.) Korth.) di hutan pendidikan Gunung Walat (HPGW), Sukabumi
Abstrak: The objectives of this study were learning the techniques of utilizing puspa (Schima wallichii (DC.) Korth.) wildlings in Gunung Walat (GWUF), Sukabumi, as planting stocks and studying the respond of these wildlings which were utilized as bare root (uprooted) plants and earth balled plants. Experiment for this purpose was conducted as completely randomized design (CRD) with six treatments, namely: bare root (uprooted) plants with plant heights of 2−29 cm, bare root (uprooted) plants with plant heights of ≥ 30 cm, bare root (uprooted) plants with initial plant heights of 2−29 cm accompanied with soil loosening, bare root (uprooted) plants with initial plant heights of ≥ 30 cm accompanied with soil loosening, earth balled plants with initial plant height of 2−29 cm, and earth balled plants with initial plant height of ≥ 30 cm. Increment of height and number of leaves for earth balled plants with initial height of ≥ 30 cm showed the best respond as compared with other treatments. Plants with initial height of ≥ 30 cm possessed greater biomass and possessed more water and are therefore more resistant toward desiccation. However, there were no significant difference between the six techniques (treatments) of utilizing puspa wildlings in terms of survival percentage, percentage of desiccated leaves, and percentage of shed leaves.
Keyword: 

Judul: Composition and Stand Structure of Puspa (Schima wallichii (DC.) Korth. in Mount Halimun Salak National Park, Sukabumi
Abstrak: Puspa termasuk salah satu jenis tumbuhan dataran tinggi yang mampu tumbuh di lahan kritis, sehingga dapat digunakan untuk memulihkan area hutan pegunungan yang rusak. Penelitian ini bertujuan untuk menganalisis komposisi jenis, struktur tegakan Schima wallichii (DC.) Korth. dan aspek biofisik tegakan Schima wallichii (DC.) Korth. di zona inti TNGHS. Metode penelitian ini menggunakan analisis vegetasi dengan plot yang ditempatkan secara purposive sampling. Hasil penelitian menunjukkan bahwa komposisi jenis memiliki kerapatan tinggi sampai rendah berturut-turut dari semai sampai pohon. Keseluruhan plot pada lokasi penelitian didominasi oleh Schima wallichii (DC.) Korth. Struktur tegakan hutan pada seluruh plot menunjukkan pola hubungan jumlah pohon dengan kelas diameter membentuk kurva membentuk “J” terbalik (eksponen negatif). Sebaran puspa dalam plot penelitian menunjukkan sebaran mengelompok. Hal tersebut berdampak baik untuk proses regenerasi alami. Seluruh aspek biofisik yang diukur pada plot penelitian relatif seragam., Puspa is one of the highland plant species that can grow on critical land, so it can be used to restore damaged mountain forests. This study aims to analyze the species composition, stand structure of Schima wallichii (DC.) Korth. and biophysical aspects of Schima wallichii (DC.) Korth. stands in the core zone of TNGHS. This research method uses vegetation analysis with plots placed by purposive sampling. The results showed that the species composition had high to low density from seedling to tree, respectively. The entire plot at the research site was dominated by Schima wallichii (DC.) Korth. The structure of forest stands in all plots showed a pattern of relationship between the number of trees and diameter class forming an inverted "J" curve (negative exponent). The distribution of puspa in the research plot shows a clustered distribution. This has a good impact on the natural regeneration process. All biophysical aspects measured in the research plots were relatively uniform.
Keyword: puspa, regeneration, TNGHS, vegetation analysis

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.
Keyword: