Judul: Keanekaragaman dan Pola Sebaran Spesies Tumbuhan Asing Invasif Di Cagar Alam Yan Lapa
Abstrak: Invasive alien plants species were plant species which come from other regions or countries and gift negative impact to the native species diversity. This research aimed to identify the vegetation composition and structure, invasive alien plant species diversity, and distribution pattern of invasive alien plant species in Yan Lapa Nature Reserve. The methods used were vegetation analysis using combination of line transect and nested plot and rapid assessment. The most dominant family was Araceae. As many as twelve invasive alien plants species were identified exist in Yan Lapa Nature Reserve. Those twelve species were Acmella uliginosa, Ageratum conyzoides, Centotheca lappace, Cyathula prostrata, Paspalum conjugatum, Clidemia hirta, Chromolaena odorata, Elephantopus scaber, Mikania micrantha, Cecropia peltata, Swietenia macrophylla dan Lantana camara. All invasive alien plant species distribution patterns were clustered.
Keyword: Bogor Agricultural University (IPB), distribution pattern, invasive alien plants species, Yan Lapa Nature Reserve, Vegetation analysis

Judul: Keanekaragaman dan Pola Sebaran Spesies Tumbuhan Asing Invasif di Cagar Alam Dungus Iwul, Bogor
Abstrak: Dungus Iwul Nature Reserve is one of the conservation area that is supposed getting invacived by alien plant species. The purpose of this research is to identify the composition and structure of forest vegetation, diversity and distribution patterns of invasive alien plant species in Dungus Iwul Nature Reserve. Data was colected by vegetation analysis with squared track and line combination. The composition of plant species that is identified in Dungus Iwul Nature Reserve consist 69 species of 34 families wich mostly Euphorbiaceae. Identified of invasive alien plant species consist 6 species from 4 families. They are: Clidemia hirta (Melastomataceae), Ageratum conyzoides (Asteraceae), Cynodon dactylon (Poaceae), Chromolaena odorata (Asteraceae), Mikania micrantha (Asteraceae) and Piper aduncum (Piperaceae). The distribution patterns of invasive alien plant species based on Morisita index was clumped
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Judul: Membran Komposit Polistirena Tersulfonasi–SiO2 untuk Aplikasi Direct Methanol Fuel Cell
Abstrak: Nafion® merupakan membran elektrolit pada direct methanol fuel cell (DMFC) yang memiliki nilai permeabilitas metanol yang tinggi. Oleh karena itu, membran alternatif seperti polistirena tersulfonasi (PSS) yang ditambahi SiO2 dikembangkan untuk mengurangi tingginya permeabilitas metanol tersebut. Penelitian ini bertujuan menentukan pengaruh tambahan SiO2 pada kinerja PSS. Keberhasilan proses sulfonasi ditunjukkan oleh nilai derajat sulfonasi (DS) dari PSS dengan konsentrasi PS 15% sebesar 81%. Membran komposit dibuat dengan ragam konsentrasi 3%, 5%, dan 7%. Spektrum inframerah transformasi fourier membran komposit menunjukkan gugus sulfonat (-SO3) pada 1008 cm-1 dan O-Si-O pada 1013 cm-1. Nilai konduktivitas proton dan beda potensial tertinggi dihasilkan pada membran PSS-SiO2 3% dengan nilai berturut-turut 2.1 × 10-4 S/cm dan 79 mV. Berdasarkan hasil tersebut, membran komposit PSS-SiO2 dapat diaplikasikan untuk DMFC.
Keyword: membran komposit, SiO2, polistirena tersulfonasi, sel bahan bakar metanol