Judul: . Keanekaragaman Dan Pola Sebaran Spesies Tumbuhan Asing Invasif Di Semenanjung Prapat Agung, Taman Nasional Bali Barat
Abstrak: Spesies tumbuhan asing invasif didefinisikan sebagai tumbuhan yang tumbuh di luar habitat alaminya, kemudian mengancam keberadaan tumbuhan asli yang ada di sekitarnya. Penelitian ini bertujuan mengidentifikasi komposisi tumbuhan, keanekaragaman, dan pola sebaran tumbuhan asing invasif di hutan musim dan savana Semenanjung Prapat Agung (SPA). Metode yang digunakan adalah metode analisis vegetasi kombinasi jalur berpetak pada hutan musim dan analisis petak ganda pada savana. Tumbuhan asing invasif di SPA yang teridentifikasi sebanyak 15 spesies termasuk dalam 8 famili yaitu Gliricidia sepium, Lantana camara, Vernonia cinerea, Chromolaena odorata, Abrus precatorius, Stachytarpeta jamaicensis, Ageratum conyzoides, Passiflora foetida, Imperata cylindrica, Amaranthus spinosus, Dactyloctenium aegyptium, Euphorbia hirta, Cassia tora, Hedyotis corymbosa, dan Eleusine indica. Tumbuhan asing invasif di SPA memiliki pola sebaran mengelompok.
Keyword: pola sebaran, Semenanjung Prapat Agung, tumbuhan asing invasif

Judul: Keanekaragaman dan Pola Sebaran Spesies Tumbuhan Asing Invasif di Resort Gunung Butak Taman Nasional Gunung Halimun Salak
Abstrak: dapat hidup serta berkembang di luar habitat alaminya dan dapat mendominasi suatu habitat. Penelitian ini bertujuan mengindentifikasi keanekaragaman spesies tumbuhan asing invasif dan pola sebaran spesies tumbuhan asing invasif di Resort Gunung Butak Taman Nasional Gunung Halimun Salak. Metode yang digunakan adalah metode analisis vegetasi kombinasi jalur berpetak pada hutan dan analisis petak ganda pada savana. Tumbuhan asing invasif di Resort Gunung Butak Taman Nasional Gunung Halimun Salak yang teridentifikasi sebanyak 24 spesies dari 12 famili yaitu Achmella paniculata, Ageratum conyzoides, Axonopus compressus, Bellucia axinanthera, Calliandra calothyrsus, Centella asiatica, Chromolaena odorata, Clidemia hirta, Commelina diffusa, Crassocephalum crepidioides, Ipomea cairica, Lantana camara, Maesopsis eminii, Melastoma malabathricum, Mikania micrantha, Mimosa pudica, Musa acuminata, Paspalum conjugatum, Piper aduncum, Solanum torvum, Stachytarpheta indica, Tihtonia diversifolia, Imperata cylindrica, dan Sphagneticola trilobata.
Keyword: pola sebaran, resort gunung butak, tumbuhan asing invasif

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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