Judul: Keanekaragaman spesies tumbuhan asing invasif di Kampus IPB Darmaga, Bogor
Abstrak: Kampus IPB Darmaga dengan luas sekitar 256,97 ha memiliki tutupan vegetasi yang beragam, baik itu vegetasi homogen maupun campuran yang digunakan sebagai kebun percobaan dan ruang terbuka hijau. Vegetasi yang ada di kampus ini sebagian berasal dari spesies introduksi. Introduksi spesies ini adakalanya dapat mengganggu ekologi tumbuhan yang ada di kampus ini, terutama tumbuhan yang bersifat invasif. Sehubungan dengan itu, maka perlu dilakukan penelitian mengenai spesies tumbuhan asing invasif untuk mengidentifikasi komposisi spesies dan pola penyebaran spesies tumbuhan asing invasif di Kampus IPB Darmaga. Penelitian ini dilakukan pada Bulan Januari–Februari 2011 di sepuluh unit lokasi, yaitu Arboretum Fahutan, Arboretum Hutan Tropika, Arboretum Lanskap, Hutan di samping Masjid Al-Hurriyyah, Hutan Cikabayan, Tegakan Karet di depan Rusunawa dan Asrama C4 Silva, Tegakan Jati Sengked, Tegakan Pinus Cangkurawok, dan Tegakan Sengon Rektorat. Pengambilan data dilakukan dengan analisis vegetasi menggunakan metode petak ganda ukuran 2 m x 2 m, jarak antar petak 5 m, dan sebanyak 25 petak contoh untuk setiap unit lokasi. Identifikasi spesies tumbuhan asing invasif menggunakan buku panduan lapang Webber (2003) dan ISSG (2005). Jumlah spesies hasil analisis vegetasi yang dapat diidentifikasi sebanyak 153 spesies dari 60 famili. Tegakan Pinus Cangurawok memiliki komposisi spesies tumbuhan tertinggi, yakni 56 spesies dari 33 famili, sementara Tegakan Karet di depan Asrama C4 Silva memiliki komposisi spesies terendah, yakni 26 spesies dari 19 famili. Spesies tumbuhan yang tergolong spesies asing invasif di Kampus IPB Darmaga berjumlah sebelas spesies dari sembilan famili yaitu; Ageratum conyzoides L. (Asteraceae), Chromolaena odorata (L.) King & H.E.Robins (Asteraceae), Clidemia hirta G. Don. (Melastomataceae), Elaeis guineensis Jacq. (Arecaceae), Lantana camara L. (Verbenaceae), Mikania micrantha H.B.K (Asteraceae), Mimosa pudica Duchass & Walp. (Fabaceae) Piper aduncum L. (Piperaceae), Rubus moluccanus L. (Rosaceae), Spathodea campanulata Beauv. (Bignoniaceae), dan Swietenia macrophylla King. (Meliaceae). Sementara itu, pola penyebaran seluruh spesies tersebut adalah mengelompok.
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Judul: Keanekaragaman Spesies Tumbuhan Langka dan Sebarannya di Kampus IPB Darmaga
Abstrak: Various vegetation cover in IPB Darmaga Campus makes this place has plenty kinds of plants including naturally and wildly grown plants. Some of the plants are included as rare plants species. The rare plants species are potential to be utilized as media for conservation education. However, there’s no research yet about those rare plants and its distribution in IPB Darmaga Campus. The purpose of this research was to identify, determine the distribution, and document the history of rare plants species in IPB Darmaga Campus. Based on this research, there were 30 rare plants species from 18 families. Dipterocarpaceae was recorded as the dominating family. These rare plants species were dominated by tree habitus and were distributed in the whole area of IPB Darmaga, but mostly found in Faculty of Forestry area. These species were mostly planted by lecturers and alumni of Faculty of Forestry, Bogor Agricultural University (IPB). The purpose is for collection and student learning media.
Keyword: Bogor Agricultural University (IPB), rare plants species, IPB Darmaga Campus, conservation education

Judul: Resonance technique HHO generator for internal combustion engine
Abstrak: Application of HHO gas as fuel had been generaly used. Though there was still controversy regarding its efficiency and efectiveness . In this research, hydrogen that hopefully could become an alternative renewable energy was produced by the electrolysis process. HHO was the mixture of hydrogen gas and oxygen gas that was formed in HHO dry generator. In HHO cell (dry) generator contained 10 cells, and each cell required 2.4 voltage. Furthermore, resonance DC application was evaluated to gain the better electrolysis efficiency. The test was held by using 2 level of electrolyte consentration, 0.178 M KOH and 0.446 M KOH. Each concentration was tested by 3 size of inductors, 8uH, 40uH, and 100uH. Not only single frequency was used, but modulatedfrequency was used also as well. In order to measure the improvement of resonance techinique application, specific energy was compared between using resonance technique and conventionaltechnique.Specific energy was calculated between output (mass of hydrogen) and input energy (watt hour). In this test,input of specific energy was measured in two condition:energy from the source (total) and energy in HHO generator only. From the test, it could be concluded that modulated frequency, by using40 Hz and 2405 Hz frequency, 100uH inductor, and 0.446 M OH, only 61% of total specific energy that was used in HHO generator. It needed23.91 watt hour energy (total) to produce 1 gram of hydrogen gas.On the other hand, the worst performance was happened in single frequency, 11270Hz, 8uH of inductor, and 0.178 KOH, where the loss of specific energy was 82%. The conventional technique only loosed about 0.5% of specific energy in 0.178 KOH needed 51.37watt hour to provide one gram of hydrogen. The loss was happened due to the excess of current that was converted into head in MOSFET. Hopefully the further research will be held again by using wet type of HHO generator because dry generator did not have fixed capacity value and it maked difficulty for calculating the perfect resonance condition.
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