33 research outputs found
Supercritical water gasification of sewage sludge with phosphorus recovery
Get PDF内容の要約博士(工学)Doctor of Engineering広島大
UJI EKSPERIMENTAL SEMEN PAPAN PARTIKEL BERBAHAN BAKU LIMBAH FLY ASH BATU APUNG SEBAGAI BAHAN PEREDAM SUARA
No full textBy the development in technology especially in architecture and industry with its noise activity, encourage us to do some efforts to solve noise problem. One might done is utilize pumice as noise absorber. Raw material used in this reaserch is pumice ash. Mixing compotsition variation between cement composition, pumice ash as sand subtitution, with comparison mixing composition at 1 : 6 (1 cemen : 6 ash), 1 : 8 (1 cement : 8 ash :), 1 : 10 (1 cement : 10 ash). Sound absorbtion coefisien are measured by standing wave tube apparatus. The result of the research indicates that mixing composition affects the sound absorbtion coefisien. Reaserch shows taht 1 : 6, 1 :8 and 1 : 10 sound absorbtion coefisien which is 0.96, 0,86 and 0.89 in 8000 Hz frequency. Comparison at 1 : 6, 1 : 8 and 1 : 10 (cement : sand ) has the best absorbtion coefisien at comparation 1 : 10 which is 0.98 with 4000 Hz frequency (middle level frequency)
Insights into the behavior and kinetics of purun tikus degradation during slow pyrolysis
Get PDFPurun tikus (Elocharis dulcis), a type of wetland biomass feedstock, is a challenge to the swamp ecosystem as it contributes to pollution in the area. Hence, integrating the use of purun tikus as a source of bioenergy, particularly in the form of bio-oil, is of the highest priority. Nevertheless, there is a lack of research on the degradation rate of purun tikus conversion to bio-oil through pyrolysis. Thus, this study aims to evaluate the rate of destruction of purun tikus in the process of conversion into bio-oil via pyrolysis. In the experiment, a batch reaction vessel was used to carry out slow pyrolysis at temperatures ranging from 300 to 500 °C, and the reaction times ranged from 60 to 120 min. By assuming a first-order process and using the Arrhenius equation, it was possible to figure out the activation energy and the preexponential factort. To determine whether purun tikus destroyed during pyrolysis, an activation energy of 43.317 kJ mol-1 and a pre-exponential factor of 0.351 s-1 were identified
PIROLISIS LIMBAH TANDAN KOSONG KELAPA SAWIT MENJADI BIOMASA SEBAGAI BAHAN BAKAR YANG APLIKATIF
No full textPengolahan tandan buah segar (TBS) menjadi minyak kelapa sawit (crude palm oil atau CPO) menghasilkan berbagai jenis limbah padat seperti tempurung kelapa, serabut kelapa dan tandan kosong kelapa sawit (TKSS). Limbah tandan kosong kelapa sawit hasil pengolahan CPO dihasilkan sekitar 22-23% dari 1 ton TBS. Pemanfaatan limbah tandan kosong sawit salah satunya dengan mengkonversi menjadi briket sebagai sumber energi alternatif. Penelitian ini mempelajari pengaruh suhu pirolisis terhadap yield dan karakteristik briket berbahan baku limbah tandan kosong kelapa sawit. Bahan perekat yang digunakan adalah larutan kanji 5%. Proses pirolisis dilakukan selama 2,5 jam pada suhu 300, 400, 500 dan 6000C dengan meminimalkan adanya oksigen di dalam sistem selama proses pirolisis berlangsung. Hasil penelitian menunjukkan bahwa semakin tinggi suhu pirolisis maka yield briket yang dihasilkan akan semakin sedikit hal ini dikarekan pada suhu tinggi tandan kosong sawit terdekomposisi menjadi gas yang dapat terkondensasi dan gas yang tidak dapat terkondensasi. Yield briket maksimum diperoleh pada suhu 6000C sebesar 67,89% wt. Karakteristik briket yang diperoleh mempunyai nilai kalor berkisar antara 4575, 73 sampai 6036,12 kalori/gram, kadar air antara 4,79 sampai 6,39%, kadar abu antara 7,47 sampai 11,67%, kadar volatil 14,40 sampai 32,07 dan nilai fixed carbon antara 34, 89 sampai 67,53%
Analisa amorized pada algoritma penyajian pohon splay dan implementasinya dengan struktur data
Get PDFSplay trees are one of binary search tree modification that can improve its trees structure by being self adjusting.
In this process, nodes that are frequently accessed are lifted up become the root of modification binary search tree and inactive nodes, on the other hand, move by being self adjusting,
Splay trees give a data structure of binary tree that always change according to requirement of its access node.
Later in this section, however, with using process of amortized analysis can be proved that running time of every shape of splay tree doesnot exceed 0( lg n ).
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