Judul: Pendugaan Sebaran Kelas Diameter dan Tinggi pada Fase Pertumbuhan Iwul (Orania sylvicola) di Cagar Alam Dungus Iwul, Bogor, Jawa Barat.
Abstrak: Iwul (Orania sylvicola) is a primitive species of palm tree. Iwul is a local threatened species in Java Island, because iwul could only be found in the Dungus Iwul Nature Reserve. The purposes of this research were to classify iwul’s diameter and height based on its growth phase and to analyze the relation between diameter and free of sheath height of iwul. The method used was field observation by measuring the the base diameter, diameter at 1 m height, diameter at 1.3 m height and free of sheath height of iwul. The results showed that the growth phase of iwul divided into seedling, establishment, vegetatively adult and reproductively adult. Differences of individual’s number in every growth phase created J curve which described that iwul’s population was growing. Diameter and free of sheath height was classified five class based on growth phase. There was overlapping the diameter and free of sheath height in each classes that indicated its could not be assumed growth phase. The Diameter and free of sheath height could only be determined on vegetatively adult, because its formed a significant relation base diameter and free of sheath height.
Keyword: iwul, phases growth, stem diameter, stem height

Judul: Komposisi Jenis dan Struktur Tegakan Hutan di Cagar Alam Dungus Iwul, Jawa Barat-Banten
Abstrak: Forests have a very big role, both as an imbalance of the ecosystem, increase the income of a country as well as support development in other sectors. Country that has a huge potential of forests is Indonesian. Forest destruction in Indonesia reached 2.8 million hectares per year of total forest area covering 120 million hectares that is spread all over Indonesia. Of the total forest area, about 57 to 60 million hectares of already degraded and the damage that Indonesia now has only forest in good condition about 50% of the total area available, while the forest area in West Java province decreased to less than 10 percent in 2010. Nature Reserves Dungus Iwul an illustration of the lowland forests. Research related to the high diversity of flora and ecological plants ever done by some researchers but scientific publications is not commonly found, that its presence seemed to have forgotten. Because biodiversity is still little information in the Nature Reserve Dungus Iwul, hence the need for a study to determine the degree of biodiversity and especially the type of tree. This study was conducted from January through February 2010 in the Nature Reserve of Dungus Iwul, West Java. This study was performed by using vegetation analysis technique which constitutes combination between strip method for tree stage vegetation inventory and plotted line method for forest regeneration inventory. Sampling units were placed in the field with sampling design of systematic sampling with random start. Based on the results, the highest number of plant species found on the smallest growth rate of saplings and poles at the level of growth. Iwul plant species (Orania sylvicola) is the dominant species at all type of plant with the different codominant species, Leea aequata for seedlings, Helicia serata at the level of sapling and poles, and Aporosa microcalyx at tree level. Diversity index (H') and evenness in Nature Reserves Dungus Iwul were high. The species richness was high for seedling, sapling and pole stages, however, is the middle level for tree stage. The structure of forest stands in CA Dungus Iwul characterized by increasingly large diameter stem the diminishing number of individuals. Forest vegetation in CA Dungus Iwul vertically composed of three strata. For all species irregular pattern showed clustered
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Judul: Katalis Zink Ferit Tersubstitusi Cu untuk Oksidasi Benzil Alkohol
Abstrak: Katalis berperan dalam menurunkan energi aktivasi. Katalis ZnFe2O4 dan ZnFe2O4 tersubstitusi Cu disintesis menggunakan metode kopresipitasi untuk digunakan dalam oksidasi benzil alkohol. Katalis dicirikan dengan spektrofotometer inframerah (FTIR) dan difraktometer sinar-X. Spektrum FTIR menunjukkan puncak serapan dari ikatan Zn-O dan Fe-O masing-masing pada rentang 559‒575 cm-1 dan 419‒447 cm-1. Difraktogram menunjukkan terbentuknya fase tunggal Zn0.6Cu0.4Fe2O4 pada katalis ZnFe2O4 tersubstitusi Cu 20%. Benzil alkohol dioksidasi dengan sistem refluks. Konversi benzil alkohol meningkat dengan meningkatnya suhu. Kadar benzaldehida yang dihasilkan dengan katalis ZnFe2O4 tersubstitusi Cu 20% lebih tinggi dibandingkan dengan katalis ZnFe2O4 yang tidak tersubstitusi dan yang tersubstitusi Cu 60 dan 80%. Hal tersebut menunjukkan bahwa katalis ZnFe2O4 tersubstitusi Cu 20% memiliki kinerja yang lebih baik dalam oksidasi benzil alkohol menjadi benzaldehida dengan kadar benzaldehida 8.763%.
Keyword: Benzil alkohol, katalis, oksidasi, ZnFe2O4