Judul: Studi kemampuan tanaman dalam menyerap dan menjerap timbal emisi dari kendaraan bermotor
Abstrak: Tujuan penelitian ini adalah untuk menge- tahui kemampuan daun tanaman dalam menjerap sorpsi) (ad- dan menyerap (absorpsi) timbal-udara ha- sil emisi dari kendaraan bermotor./ Dengan de- mikian, akan diperoleh daftar penggolongan kemam- puan tanaman berdasarkan kejerapan dan daun terhadap timbal-udara. keserapan Penelitian dilakukan dari bulan Juli sampai dengan Desember 1988. pat lokasi yakni: Percobaan dilakukan di em- (1) Jalan Sudirman sion bis Baranang Siang dan (4). Bogor. Sindang Barang. (3). (2) Sta- Jalan tol Jagorawi Semuanya terletak di Tanaman yang berumur sekitar 10 12 terdiri dari: pala bulan (Myristica fragrans), Кири-кири (Bau- Kesumba yang Jamuju (Podocarpus imbricatus). hinia purpurea). (Bixa orellana), dan damar (Agathis alba), mahoni (Swietenia macrophylla) kirai payung (Filicium decipiens) ditanam di ke empat lokasi tersebut di atas
Keyword: Absorption, Sorption

Judul: Kemampuan Tanaman Hias dalam Menjerap Debu yang Dihasilkan oleh Kendaraan Bermotor (Studi Kasus: Bumi Serpong Damai)
Abstrak: There are many researches about plants based by their ability of sensitivity and tollerance for pollutant. This research measured kind of plants that planted in Bumi Serpong Damai, South Tangerang for adsorbing dust caused by vehicles. The location divided based on traffic level: high, medium and low. This research used 2 methods, measuring ever 4 hours and every 24 hours. The measurement every 4 hours at high traffic location stated that Heliconia adsorb dust highest, it is 53.73 mg/hour. At medium traffic location, Kaca Piring adsorb dust highest, it is 40.19 mg/hari. At low location Pandan Kuning adsorb dust highest, it is 26.82 mg/hour.The measurement every 24 hours at high traffic location stated that Heliconia adsorb dust highest, it is 59.53 mg/day.The measurement every 4 hours is better than measurement every 24 hours. This method affected by double tape saturation andadhesive decreasecaused the data become error. At medium traffic location, Kaca Piring adsorb dust highest, it is 47.95 mg/day. At low location Rowelia Tegak adsorb dust highest, it is 39.75 mg/dayHeliconia, Rowelia Tegak, Kaca Piring and Pandan Kuning are kind of plants that could adsorb dust well. Plant choosing based the leave surface could help adsrobing the dust more effective. Besides, combining the plants will be more effective for adsorbing dust.
Keyword: 

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model