Judul: Stek Pucuk Merawan (Hopea cernua Teijsm. & Binn.) dengan Perlakuan Media Tumbuh dan Hormon
Abstrak: Merawan (Hopea cernua Teijsm. & Binn.) is one of species that being tested in Center for Conservation and Rehabilitation Research and Development (CCRRD) Gunung Batu. This species brought from its natural source in Lampung to CCRRD for the advanced research. The purpose is to acquire the best treatments that can be used for species propagation effort. This research shown that sand media with 5% husk charcoal has a very real effect for survival percentage, shooting percentage; and has a real effect for rooting percentage, root length and number of roots. Rootone-F hormone has a real effect for the survival percentage and shooting percentage. The highest result for survival percentage were seen in sand media with husk charcoal by 91.38% and in Rootone-F by 86.00%. The highest results for shooting percentage were seen in sand media with husk charcoal by 77.18% and 71.43% for Rootone-F hormone. The highest result for rooting percentage, root length and number of roots were seen in sand media with husk charcoal by 18.57%, 214.25 cm, and 64 roots.
Keyword: shoot cuttings, hormone, Hopea cernua, growth media

Judul: Pengaruh Umur Pohon Induk dan Jenis Media terhadap Keberhasilan Stek Pucuk Bintaro (Cerbera manghas L.)
Abstrak: Bintaro (Cerbera manghas L.) is one of tree species that grows naturally on coastal areas which it seeds may produce a high quality of biofuel. Bintaro propagation generatively may reduce the seeds availability as bio fuel producer. Therefore, the vegetative propagation is one of the technique that may solve the problem. The purpose of this research were to examine the effect of parent tree’s age (6 month old and 10 years old) and the media types (zeolite, charcoal chaff, mixed of cocopeat and rice husk (2:1)) on the success of bintaro cutting sprout. Parameters observed are percentage of germinate, percentage of roots, length of primary root, and dry weight of roots. The difference of parent tree age influence significantly the cutting success of bintaro sprout. The parent tree within 6 month old gave the highest result toward all parameters observed rather than the parent tree of 10 years old. The mixed media of cocopeat and rice husk (2:1) and also the charcoal chaff gave higher respond toward the amount of primary roots and dry weight of roots compared to the zeolite media type.
Keyword: shoot cutting, media types, biofue, bintaro, age of the parent tree’s

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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