Judul: Incinerator Portabel Berbahan Bakar Serabut Kapuk Randu dan Minyak Jelantah sebagai Perangkat Penegakan Biosekuriti di Indonesia
Abstrak: Biosecurity is one of the measures to prevent the spread of infectious disease agents. Incineration of material suspected to eleminate disease agents is one of biosecurity method applied in the field. However, the usage of incinerator in Indonesia is still limited due to high price of incinerator and operational costs including fuel and/or electricity. The present study was designed to develop and test performance of a kapok-used oil fueled portable incinerator. Kapok (Ceiba pentranda) fiber and used oil combination is an alternative fuel that could generate considerable amount of heat. Two types of portable incinerator, namely double and single chamber incinerator were developed in this study. Furthermore, the influences of fuel amount, incinerator design, and type of waste were tested in 5 minutes incineration process. Incineration using more fuel was shown to increase and delay the peak incineration temperature (400 °C at minute 3 vs. 530.67 °C at minute 4). The single chamber incinerator design shown to had a higher peak incineration temperature than the double chamber design (400 °C vs. 814.33 °C each at 400 g fuel usage). The anorganic waste (plastic and metal) showed to had a higher peak incineration temperature than the organic waste (embryonated egg) (923 °C vs. 1 163 °C each at 800 g fuel usage). The higher incineration temperature also caused the higher waste reduction rate in the anorganic waste incineration process (56.54% vs. 76.47% at 800 g fuel usage). The peak temperature of each waste incineration surpassed the European Standard for Incineration Process (850 °C/2 seconds for general waste; 1 100 °C/2 seconds for chlorinated waste). Therefore, the kapok-used oil fueled portable incinerator is potential to be used as a biosecurity device.
Keyword: portable incinerator, kapok-used oil fuel, biosecurity, alternative fuel, Bogor Agricultural University (IPB)

Judul: Desain dan Uji Kinerja Alat Pembakar Sampah (Incinerator) Tipe Batch Untuk Perkotaan Dilengkapi dengan Pemanas Air
Abstrak: Municipal solid waste (MSW) management is very important in order to keep the city clean, beautiful, and health. The waste could be utilized by various process that suitable each kind of waste. Organic waste can be utilized by composting process or biogas generation. While an-organic waste can be recycled. Incinerator was needed for toxic and medical waste utilization, due to its capability to burnt off the toxic materials. Small incinerator seems an important solution for urban household waste management due to the shortage area for composting or other waste utilization. Beside that, heat energy which produced by combustion process in the incinerator could be use for several purposes to fulfill household demand such as drying process or water heater process. The aim of this study is to design an incinerator which can be implemented in the urban household. Those incinerator combined with water heating system as utilization of heat energy produced by the combustion process and smoke cyclone which can be used for drying or carbonization process Result of the performance of the incinerator shows that the incinerator working well. The capacity of the incinerator is 0.294 m3. The weight of the waste that filled the incinerator is 10.5 to 18.3 kg. The maximum burn temperature is 413 to 478 oC. The incineration rates of the incinerator around 2.81 to 6.82 kg/hour. Quality of smoke is good, showed by the colour of the smoke (near white). Heat energy produced by the system has been used for water heating and coconut shell carbonization process. Using water flow rate 3 l/minutes, the temperature of the water can be raised 14-18 oC per batch process. While carbonization process only produce 10% charcoal from 5 kg coconut shell which has been feed in the smoke cyclone room Modification of the gas hole can increasing the temperature of incineration and modification of the length and relocation of pipe can increasing the water heater performance.
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Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular