Judul: aPenyempurnaan Desain dan Uji Ketahanan Konverter Biogas untuk Motor Bakar Bensin
Abstrak: Several studies have been conducted before to run the combustion engine with biogas as engine fuel by modifying the carburetor into biogas converter. There were some problems with the former research, specifically in inappropriate biogas converter design and the strength is still low. The objectives of this research are to improve the design of biogas converter and do the endurance test. This research is started from design, prototyping, and endurance test for 50 hours. The steps of endurance test are to observe the stability of engine speed, determine fuel consumption, and analyze the lubricant for predict it’s lifespan. The endurance test result on engine speed was stable, which is represented by standard deviation of engine speed at 0,86 rpm. Based on the lubricant analysis, the lifespan of lubricant could be predicted at 71 hours by using biogas as engine fuel in the combustion engine.
Keyword: Bogor Agricultural University (IPB), lifespan prediction, lubricant analysis, endurance test, biogas converter

Judul: Modifikasi Konverter Biogas untuk Motor Bensin
Abstrak: Biogas contains methane at about 60-65% which is potential to be used as fuel. Biogas is also possible to replace gasoline as fuel on internal combustion engine. A new design of biogas converter is needed to optimize biogas deployment as fuel on motor gasoline fuel. . The objectives of this research are modifying and testing biogas converter. This biogas converter consists of some main components, including venturi, venturi housing, choke, throttle, chamber tube and flange. The design of biogas converter could be worked with existing governor mechanism of the engine. Design of biogas converter are the gas cylinder 1 (Ø 50 × 80 mm), gas cylinder 2 (Ø 40 × 130 mm) and without gas cylinder. The experiment has been tested by measuring engine maximum motor rotation and pump discharge water. According to the experimental result the biogas converter with first gas cylinders show better perfome than the gas cylinder 2 or without gas cylinder, so it can optimize biogas deployment as alternative energy to drive the motor gasoline fuel. The pump discharge water 6.62 litres/min at 2390 rpm and maximum motor rotation use of biogas converter is 3390 rpm.
Keyword: Biogas converter, Internal combustion engine, Alternative energy, Biogas

Judul: Taksonomi dan variasi morfologi secara geografi pada trachypitkecus auratus (E. Geoffroy, 1812) dan trachypithecus cristatus (Raffles, 1821 (Primates=Cercopithecidae=Colobinae)
Abstrak: Penelitian yang bertujuan untuk mengungkapkan status taksonomi Trachypithecus auratus dan Trachypithecus cristatus dilakukan atas dasar spesimen yang disimpan di dalam koleksi Museum Zoologicum Bogoriense Balitbang Zoologi, LIPI (MZB); Pusat Pengkajian Sumberdaya Alam Sumatra. Jurusan Biologi, Fakultas MIPA, Universitas Andalas (PBC SD dan PBC PT) dan Zoological Reference Collection, National University of Singapore (ZRC). Untuk mengetahui status taksonomi kedua jenis tersebut, materi yang digunakan untuk analisis se-banyak 80 buah spesimen dan dilakukan pengukuran berdasarkan pada 28 variabel tengkorak dan dua variabel tubuh. Menggunakan analisis regresi berganda dapat menerangkan bahwa tujuh macam variabel tengkorak dan dua variabel tubuh tidak dipengaruhi oleh jenis kelamin. Variabel tersebut yaitu panjang dan lebar foramen magnum (FML dan FMW), jarak antara molar 3 (M3-M3), lebar mesopterigoid fosa (MFW), lebar terdekat interorbital (PIW), lebar post orbital (POW), panjang tulang hidung (TH), panjang badan dan panjang ekor. Analisis diskriminan dapat menerangkan bahwa pada populasi Trachypithecus auratus di Jawa dijumpai bentuk variasi klinal yang mengakibatkan di Pulau tersebut hanya dijumpai satu anak jenis yaitu T. auratus auratus. Sebaliknya pada populasi T. cristatus dijumpai ada lima macam bentuk yaitu Thailand, P. Natuna, Bintang, Sumatra-Kalimantan dan Malaya yang merupakan bentuk intermediar antara P. Sumatra-Kalimantan dan Bintang…dst
Keyword: Trachypithecus cristatus, Morphology, Cercopithecidae, Colobinas