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Hafif Dafiqurrohman
"Rice husk is one of the most abundant biomass wastes in Indonesia. One way to convert it into an alternative source of energy is biomass gasification. This is a thermochemical process which converts biomass feedstock into fuel gas or chemical feedstock gas (producer gas). The gasification type which is developed in this study is fixed bed downdraft type due to its low tar content and compatibility in microscale implementation. One major problem with the implemented biomass gasification reactor was ruggedness of the partial oxidation process due to the absence of air in the reactor’s middle section, which consequently affected the pyrolysis zone. Several experiments were conducted previously using coconut shells and rice husks as solid feedstock, where an equivalence ratio (ER) of 0.4 was obtained. Therefore, in order to optimize the pyrolysis zone, the modification conducted involves adding a circular air intake into the gasifier. Experiments were conducted in a pyrolysis temperature range of 300–700oC with ER variation of 0.19, 0.24, 0.27 and 0.31. The results show that a good quality producer gas is produced at an ER value of 0.24. This value shows a promising result because the ER value of biomass gasification standard is 0.25."
Depok: Faculty of Engineering, Universitas Indonesia, 2017
UI-IJTECH 7:8 (2016)
Artikel Jurnal  Universitas Indonesia Library
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Hafif Dafiqurrohman
"Rice husk is one of the
most abundant biomass wastes in Indonesia. One way to convert it into an
alternative source of energy is biomass gasification. This is a thermochemical
process which converts biomass feedstock into fuel gas or chemical feedstock
gas (producer gas). The gasification type which is developed in this study is
fixed bed downdraft type due to its low tar content and compatibility in
microscale implementation. One major problem with the implemented biomass
gasification reactor was ruggedness of the partial oxidation process due to the
absence of air in the reactor?s middle section, which consequently affected the
pyrolysis zone. Several experiments were conducted previously using coconut
shells and rice husks as solid feedstock, where an equivalence ratio (ER) of
0.4 was obtained. Therefore, in order to optimize the pyrolysis zone, the
modification conducted involves adding a circular air intake into the gasifier.
Experiments were conducted in a pyrolysis temperature range of 300?700oC
with ER variation of 0.19, 0.24, 0.27 and 0.31. The results show that a good
quality producer gas is produced at an ER value of 0.24. This value shows a
promising result because the ER value of biomass gasification standard is 0.25."
2016
J-Pdf
Artikel Jurnal  Universitas Indonesia Library
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Leon A. Mears
Jakarta: Pembangunan Djakarta, 1975
338.175 MEA r
Buku Teks  Universitas Indonesia Library
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Ibrahim Hasan
Jakarta: Fakultas Ekonomi Universitas Indonesia, 1976
338.1 IBR
Buku Teks  Universitas Indonesia Library
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Nababan, Marvel Hasiholan
"Padi mampu menggunakan protein ferritin untuk melindungi diri dari toksisitas besi. Protein ferritin merupakan suatu protein berbentuk sferis yang dapat mereduksi besi sehingga menghilangkan potensi toksisitas besi. Padi yang tahan toksisitas besi telah ditemukan di antaranya padi INPARA2, Mahsuri, Pokkali, dan Siam Saba. Penelitian mengenai analisis sekuen gen ferritin diperlukan untuk membentuk strategi pemuliaan varietas padi yang tahan toksisitas besi. Penelitian ini bertujuan untuk melakukan analisis sekuen gen OsFer1 dan OsFer2 pada padi varietas Ciherang, Cibogo, dan INPARA 8. Sekuen gen ferritin berupa kromatogram yang didapat adalah sekuen gen OsFer1 dan sekuen gen OsFer2 Sekuen OsFer1 ditemukan pada ketiga varietas dan ditemukan sekuen OsFer2 pada padi varietas Ciherang dan Cibogo. Sekuen yang ditemukan berupa sekuen parsial yang terdapat pada ekson1, intron 1 dan ekson 2 dengan sekuen OsFer1 yang sepanjang 530 dan 568 pasang basa. Sekuen OsFer2 ditemukan sepanjang 212 pasang basa. Sekuen OsFer1 dan Sekuen OsFer2 ditemukan memiliki kemiripan sekuen yang tinggi jika dibandingkan dengan sekuen referensi. Sekuen OsFer1 dan OsFer2 ditemukan menunjukkan banyak mismatch yang berbentuk mutasi subtitusi. Sekuen OsFer2 menunjukkan adanya 14 mutasi deep intronic dan 2 mutasi proximal intronic. Sekuen OsFer1 menunjukkan adanya 1 mutasi exonic.

Rice is capable of utilizing ferritin in response to iron toxicity. Ferritin is a spherical protein that can reduce iron thus neutralizing its toxicity. Several rice varieties have been found to show considerable tolerance to iron toxicity such as INPARA2, Mahsuri, Pokkali, and Siam Saba. Sequence analysis studies focusing on ferritin genes is important for future rice breeding programs. This study is aimed to analyze OsFer1 and OsFer2 gene sequence in Ciherang, Cibogo, and INPARA 8. The sequences obtained in this study are chromatograms showing partial sequences from OsFer1 and OsFer2. The length of OsFer1 sequences are 530 and 568 base pairs and OsFer2 with 212 base pairs. OsFer1 sequences are recovered from the three rice varieties and OsFer2 are found from Ciherang and Cibogo. OsFer1 and OsFer2 showed high similarity when compared to reference sequence. OsFer1 and OsFer2 showed high alignment with exon 1, intron 1 and exon 2. Mismatches were found in both sequences that are base subtitutions. Intronic mutations are found in OsFer2 sequence and exonic mutations are found in OsFer1. "
Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2022
S-pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Hafif Dafiqurrohman
"Sekam padi menjadi salah satu limbah biomassa yang melimpah di Indonesia. Salah satu cara konversi sekam padi menjadi energi alternatif adalah gasifikasi biomassa. Gasifikasi biomassa merupakan proses termokimia untuk mengonversi bahan baku biomassa menjadi bahan bakar gas atau bahan baku gas kimia (producer gas). Gasifikasi biomassa yang tengah dikembangkan adalah tipe fixed bed downdraft. Tipe ini dipilih karena hasil tar yang sedikit dan cocok untuk skala mikro. Salah satu permasalahan dari desain reaktor gasifikasi biomassa yang digunakan adalah kurang meratanya proses oksidasi parsial, sehingga memengaruhi zona pirolisis. Proses oksidasi parsial yang kurang merata ini disebabkan oleh pada bagian tengah reaktor tidak tersuplai udara dengan merata.
Pada penelitian sebelumnya yang menggunakan cangkang kelapa dan sekam padi, equivalence ratio (ER) untuk proses gasifikasi adalah 0,4. Maka untuk melakukan optimasi zona pirolisis, dilakukan modifikasi air intake dengan menambahkan circular air intake. Setelah dilakukan modifikasi dan pengujian pada temperatur operasional zona pirolisis 300-700 oC, dengan melakukan variasi ER yaitu 0,19, 0,24, 0,27, dan 0,31, akhirnya didapatkan ER paling optimal untuk menghasilkan producer gas dengan kualitas baik yaitu pada ER 0,24. ER paling optimal ini sesuai dengan standar gasifikasi biomassa, yaitu sekitar 0,25.

Rice husks into one of abundant biomass waste in Indonesia. One way of converting rice husks into alternative energy is biomass gasification. Biomass gasification is a thermochemical process to convert biomass feedstock into fuel gas or chemical feedstock gas (producer gas). Gasification of biomass that is being developed is a type of fixed bed downdraft. This type is chosen because the results were a little tar and suitable for the micro scale. One of the problems of biomass gasification reactor design used is less inequality partial oxidation process, thus affecting the pyrolysis zone. Partial oxidation process is uneven due to the middle part of the reactor is not well supplied with evenly distributed air.
Previous studies using coconut shells and rice husks, equivalence ratio (ER) for the gasification process is 0.4. Then to optimize the pyrolysis zone, be modified by adding circular air intake. After the modification and testing the operating temperature pyrolysis zone of 300-700 °C, by doing ER variation is 0.19, 0.24, 0.27, and 0.31, eventually obtained the most optimal ER to produce gas producer with good quality, namely the ER 0.24. This ER is the most optimized according to the standard gasification of biomass, which is about 0.25.
"
Depok: Fakultas Teknik Universitas Indonesia, 2015
S59768
UI - Skripsi Membership  Universitas Indonesia Library
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Pardamean, Hakita Belson
"ABSTRAK
Lahan bagi penduduk Indonesia adalah sumber daya yang paling penting. Seiring dengan meningkatnya kepadatan penduduk, keberadaan lahan terutama lahan pertanian menjadi semakin terancam untuk memenuhi tempat tinggal. Harga lahan akan semakin meningkat seiring dengan pemanfaatannya yang semakin meningkat dan kemudahan aksesbilitas dari lahan tersebut. Hal ini yang terjadi di Kecamatan Bogor Selatan, sebagian besar lahan yang teralihfungsikan adalah lahan sawah yang masih produktif. Penelitian ini berfokus pada analisa pengaruh fenomena konversi lahan pertanian sawah di Kecamatan Bogor Selatan. Penelitian ini bertujuan untuk mengetahui pola perubahan harga tanah sawah di Kecamatan Bogor Selatan dan menganalisis bagaimana pengaruh jarak dari Pusat Konversi Lahan serta Jalan mempengaruhi harga lahan sawah tersebut yang diperoleh dari survey lapangan dan dibantu perangkat lunak ArcGIS. Analisis dalam penelitian ini menggunakan analisis keruangan dan statistik deskriptif. Hasil Penelitian menunjukkan bahwa Secara keseluruhan harga tanah sawah di Kecamatan Bogor Selatan memiliki perubahan harga yang menyesuaikan jarak sawah ke Pusat Konversi. Dari semua populasi sawah yang ada di Kecamatan Bogor Selatan, terdapat 10 lahan sawah yang dipengaruhi oleh Jarak dari Pusat Konversi Perumahan, 3 lahan sawah yang dipengaruhi oleh Jarak dari Pusat Konversi Perdagangan, dan 3 lahan sawah yang dipengaruhi oleh Jarak dari Jalan.

ABSTRACT
Land for the people of Indonesia is the most important resource. Along with the increasing of population density, the existence of land, especially agricultural land become increasingly threatened because of the more important requirement for residence. Although land function and its use may change, land can not be moved because it is permanent. Land prices will increase in line with the increased utilization and accessibility of the land. This happens in the District of South Bogor, where most of the land that is functionalized is a productive rice field. This study focuses on the analysis of the effects of the phenomenon of conversion of paddy fields in Southern Bogor District. This study aims to determine the pattern of changes of rice land prices in South Bogor District and analyze how the influence of distance from the Land Conversion Center and Road affect the price of paddy fields which obtained from the field survey and assisted by ArcGIS software. The analysis in this research uses the analysis of spatial and descriptive statistics. The result of the research shows that the overall price of paddy field in South Bogor Subdistrict has a change in price which adjust the distance to the Conversion Center. From all the rice field populations in the District of Bogor Selatan, there are 10 paddy fields affected by the Distance from the Housing Conversion Center, three paddy fields affected by the Distance from the Trade Conversion Center, three paddy fields affected by the Distance from the Road."
2018
S-Pdf
UI - Skripsi Membership  Universitas Indonesia Library
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Djakarta: Lembaga Penjelidikan Ekonomi dan Masjarakat, Fakultas Ekonomi, Universitas Indonesia, 1961
381.41 PEM
Buku Teks  Universitas Indonesia Library
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Bambang Sapta Purwoko
Bogor: Penerbit IPB Press, 2022
641.3 BAM k
Buku Teks  Universitas Indonesia Library
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Simatupang, Felly Rihlat Gibran
" ABSTRAK
Sekam padi merupakan limbah pertanian terbesar dengan potensi 13.662 MWe per tahun. Melalui proses gasifikasi biomassa, sekam padi dapat dikonversi menjadi producer gas yang dapat digunakan untuk kebutuhan energi panas maupun listrik. Untuk menghasilkan producer gas berkualitas baik, sistem gasifikasi dengan kandungan tar rendah menjadi fokus utama penelitian. Penelitian menggunakan open top fixed bed downdraft gasifier sistem batch dilakukan dengan memvariasikan posisi injeksi udara sekunder Z dan Air Ratio AR . Hasilnya, pada AR 80 , saat Z = 38 cm, tercipta flaming pyrolysis dengan durasi terpanjang selama 400 sekon yang mengindikasikan kandungan tar terendah, serta saat Z = 50 cm, dihasilkan producer gas dengan energi pembakaran tertinggi sebesar 734,64 kJ.
ABSTRACT Rice husk is one of agricultural waste with the largest annual potency of 13,662 MWe. Using biomass gasification, rice husk can be converted into producer gas for thermal and electrical energy needs. In order to produce a good in quality producer gas, gasification with low tar content become the main focus in this research. Experiment using open top fixed bed downdraft gasifier batch system was conducted by variying the secondary air injection position Z and Air Ratio AR . As a result, when AR 80 , at Z 38 cm, flaming pyrolysis with the longest duration of 400 seconds was created which indicated that this condition had the lowest tar content, meanwhile, at Z 50 cm, producer gas with the highest combustion energy of 734.64 kJ was obtained"
Depok: Fakultas Teknik Universitas Indonesia, 2017
S66125
UI - Skripsi Membership  Universitas Indonesia Library
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