Judul: Intersepsi hujan pada perkebunan kelapa sawit (Studi kasus di Unit Usaha Rejosari PTPN VII Lampung).
Abstrak: Rainfall interception is a process of keeping temporarily of the rain water on vegetation crown, before it is being evaporated. Interception process is a phenomenon which needs to be taken into account, because it constitutes one form of water loss from a particular site. Rainfall interception in oil palm plantation need to be known to estimate the amount of rainfall which becomes run off.
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Judul: Komponen Neraca Air Tanaman Kelapa Sawit di PTPN VIII, Cimulang, Bogor
Abstrak: Rainfall interception is a process of keeping temporarily of the rain water on vegetation before evaporated back into the atmosphere. The loss of water through interception is an important part of the hydrologic cycle. Besides the interception, the water loss can be caused by evapotranspiration. Evapotranspiration is the loss of water through the soil and plant surfaces. This research was aimed to determine interception, stemflow, throughfall, and evapotranspiration. The results showed that there were 16 rainy days in 3 months period of observation which variation of daily rain from 4.83 mm/day to 95.53 mm/day. Stemflow and throughfall were increasing as the increase of rainfall. The value of stemflow obtained in field observation was very low i.e. fewer than 1%, therefore the value used for measuring interception was adapted from research conducted by Purba (2007) i.e. 7.8%. The stemflow values of each rainy day were obtained varied from 0.38 mm to 7.45 mm. The throughfall were obtained varied from 5.00 mm to 87.47 mm or from 73.00% to 127.84%. Generally, the interception values increase with the increase of rainfall, yet the percent of intercepted rainfall decreased, also the interception decreased stemflow and throughfall. The average value of interception varied between 0.51 mm and 4.32 mm or from 0.64% to 19.20%. Decreasing soil moisture in 30 cm root depth were 2.40 mm/day. Decreasing soil moisture in 60 cm root depth were 4.28 mm/day. Those values were equal to evapotranspiration.
Keyword: throughfall, stemflow, interception, evapotranspiration

Judul: Mathematical model of Hematopoietic Stem Cell in Chronic Myelogenous Leukemia with and without Therapy
Abstrak: Leukemia or blood cancer is a diverse group of neoplastic disease, characterized by the multiplication of abnormal leukocytes or malignant transformation of blood-forming cells in bone marrow and lymphoid tissues. One of the most common types of leukemia is Chronic Myelogenous Leukemia (CML), which is usually diagnosed by the presence of certain chromosomal abnormalities, the so-called Philadelphia chromosome (Ph). One of the treatments of CML is Granulocyte Colony-Stimulating Factor (G-CSF). In this paper, we discuss two Hematopoietic Stem Cell (HSC) models, i.e. HSC without treatment and HSC with G-CSF treatment. The model of HSC without treatment included three equations representing the dynamics of HSC, leukocyte and platelet. Whereas, the model of HSC with G-CSF treatment includes the previous three equations and adds two more equations representing G-CSF injection and G-CSF circulation. The stability behavior of the system approaching the equilibrium points in the simulation study is carried out using Mathematica 7.0. The simulation results show that the G-CSF treatment can successfully decrease the number of HSC, which means reducing the CML.
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