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.
Keyword: 

Judul: Penggunaan Gas HHO dan Uji Kinerjanya pada Traktor Pertanian
Abstrak: There were many efforts which can be done to reduce fossil fuel consumption. There are bioethanol, biodiesel, and enriched fuel that can be used to reduce fossil fuel consumption. This research was constituted to implement HHO gas on diesel fuel mixed for hand tractor. This research was aimed to study the performance of drawbar pull, fuel consumption and emission of tractor added with HHO gas in fuel system. Conventional HHO generator and resonance HHO generator were used to generate HHO gas HHO gas is define a mixture of hydrogen and oxygen as a result of were electrolysis, this gas also known as Brown gas. Both of them used KOH as catalyst. The concentration of catalyst used was 50gr/l, 25gr/l, 10gr/l. the results showed that drawbar pull performance increased after HHO gas added to fuel system. The drawbar pull increased up to 14.14% on concrete path and 6.39% on soil path. Fuel consumption and emission decreased after HHO gas added to fuel system.The fuel consumption decreased down to 19.21% on concrete path and 16.69% on soil path. The emission (carbon monoxide) decreased down to 68.17%.
Keyword: 

Judul: Ornithonyssus Bursa (Berlese, 1888) Famili Macronyssidae yang Menyerang Unggas Dan Penaggulangannnya
Abstrak: Ornithonyssus bursa adalah tungau penghisap darah pada unggas di daerah tropis dan subtropis. Tungau ini relatif kecil, dengan panjang tubuh antara 700-1000 mikron dan lebarnya 250-490 mikron. Tubuhnya bulat berwarna coklat kekuningan sebelum menghisap darh dan berwarna merah setelah menghisap darah dari induk semangnya.
Keyword: