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Ditemukan 43 dokumen yang sesuai dengan query
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Johny Wahyuadi Mudaryoto
"Dalam kondisi krisis moneter dewasa ini selain kita bisa melihat kemampuan diri sendiri tapi jika dilihat dan sisi yang positif bahwa saat ini kesempatan untuk mengembangkan industri didalam negeri. Salah satu yang bisa dikembangkan adalah indutri pengecoran rakyat khususnya yang memproduksi komponen kemdaraan bermotor. Dari hasil penelitian didapat bahwa untuk mendapatkan kekuatan tekan tertinggi yaitu 1002 gr/cm2, kadar bentonit 13% dan kadar air 3 % sedangkan kekuatan geser terbesar adalah 266 gr/cm2 pada kadar bentonit 13% dan kadar air 4%. Temperatur pasir cetak yang optimum adalah 40°C."
Depok: Fakultas Teknik Universitas Indonesia, 1999
LP-pdf
UI - Laporan Penelitian  Universitas Indonesia Library
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Siswanto
"ABSTRAK
Rockfill dams have better stability than homogeneous soil dams. It allows to design the dam more slim with a higher slope. The disadvantage of rockfill dam is in the core zone as an impermeable zone. Zoned vertical core rockfill dam is a combination of various material properties. Geometry and drainage design will affect the seepage and phreatic line properties that occur. Numerical modeling and calculations are used to calculate the seepage profile more accurately. The combination of the parameters of the permeability coefficient (K), reservoir water level (Δh) and the length of the seepage path (L) can be used to determine the relationship between parameters with the same unit. 2D modeling take into account saturated/unsaturated conditions with steady state on each parameter. This study uses the Jatibarang-Indonesia dam as a basic model. The seepage profile at condition K1 (k = 1x10-5cm/sec) is q/k = -0.0018 (h2/L)2 + 1.3496h2/L + 53.241 and the seepage profile K2 (k=1x10-7cm/s) is q/k = -0.1521 (h2/L)2 + 90.402h2/L + 5480.2. This equations can be used to estimate seepage that occurs in a dam of other rock fill zoned vertical core dam based on the permeability coefficient value (K) more practically for all values of Δh and L reviewed."
Bandung: Kementerian Pekerjaan Umum dan Perumahan Rakyat, 2019
627 JTHID 10:2 (2019)
Artikel Jurnal  Universitas Indonesia Library
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Djoko Andrijono
"Dalam kondisi krisis moneter dewasa ini selain kita bisa melihat kemampuan diri sendiri tapi jika dilihat dan sisi yang positif bahwa saat ini kesempatan untuk mengembangkan industri didalam negeri. Salah satu yang bisa dikembangkan adalah indutri pengecoran rakyat khususnya yang memproduksi komponen kemdaraan bermotor. Dari hasil penelitian didapat bahwa untuk mendapatkan kekuatan tekan tertinggi yaitu 1002 gr/cm2, kadar bentonit 13% dan kadar air 3 % sedangkan kekuatan geser terbesar adalah 266 gr/cm2 pada kadar bentonit 13% dan kadar air 4%. Temperatur pasir cetak yang optimum adalah 40 °C."
Depok: Fakultas Teknik Universitas Indonesia, 1999
LP 1999 35
UI - Laporan Penelitian  Universitas Indonesia Library
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"This paper presents a methods for estimating permeability of porous media based on lettice gas automata (LGA) methods. LGA is a relatively recent methods developed to perform hydrodynamic calculations. The methods , in its simplest form consists of a regular lattice populated with particles that hop from site to site in discrete time steps in a process, called prppagation. After propagation , the particles in each site interact with each other in a process called collision,in which the number of particles an momentum are conserved. An exclusion principle is imposed in order to achieve better computational efficiency. Permeability estimation of fractured rocks based on image analysis was conducted using lattice gas automata . Fractured rocks samples collected from Bukit Kaba, Bengkulu were analyzed to study fluid flow parameter, i.e. permeability and porosity. For time - ste 1.047 and radius 0,60 cm, the permeability is equal to 2,55.10 Darcy while for time - step 1, 437 and radius 0,19 cm, the permebiality is equal to 1,62.10 Darcy."
Artikel Jurnal  Universitas Indonesia Library
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Fillia Rezki Fajri
"Industri air limbah wine menghasilkan air limbah yang memiliki karakteristik tinggi kandungan organik serta pH bersifat asam. Pengolahan konvensional dalam mengolah air limbah industri wine sangat kompleks, sehingga membutuhkan penanganan secara khusus. Saat ini, terdapat teknologi pengolahan yang sesuai dengan karakteristik air limbah wine yaitu proses oksidasi Fenton dan teknologi membran. Teknologi membran memiliki ukuran pori yang berbeda-beda, saat ini banyak pemanfaatan membran jenis nanofiltrasi dalam pengaplikasian pengolahan limbah industri. Membran nanofiltrasi memiliki kemampuan yang mirip dengan reverse osmosis yang dapat menyisihkan kandungan bahan organik serta anorganik. Proses filtrasi pada penelitian ini dilakukan secara konstan fluks dengan variasi fluks 40 LMH, 50 LMH, dan 60 LMH. Hasil penyisihan COD, besi, dan warna pada fluks 40 LMH, 50 LMH, dan 60 LMH secara berturut-turut adalah 64% ; 93%; 100%, 75%; 93% ; 100%, dan 76%; 94%; 100%. Hasil penelitian menunjukkan bahwa efisiensi penyisihan paling efektif pada fluks 60 LMH. Namun fluks 60 LMH rentan mengalami fouling yang menyebabkan permeabilitas menurun seiring berjalannya waktu. Selain itu, reversibility pada kondisi pengoperasian fluks 60 LMH didominasi oleh jenis irreversible fouling, sehingga proses mechanical backwash tidak cukup untuk mengembalikan performa membran dan membutuhkan chemical cleaning.

The wine wastewater industry produces wastewater that is characterized by high organic content and an acidic pH. Conventional processing of wine industry wastewater is very complex, so it requires special handling. Currently, there are processing technologies that suit the characteristics of wine wastewater, namely the Fenton oxidation process and membrane technology. Membrane technology has different pore sizes, currently many nanofiltration type membranes are used in industrial waste processing applications. Nanofiltration membranes have capabilities similar to reverse osmosis which can remove organic and inorganic materials. The filtration process in this study was carried out at constant flux with flux variations of 40 LMH, 50 LMH, and 60 LMH. The COD, iron and color removal results at fluxes of 40 LMH, 50 LMH and 60 LMH respectively were 64%; 93%; 100%, 75%; 93% ; 100%, and 76%; 94%; 100%. The results showed that the removal efficiency was most effective at a flux of 60 LMH. However, 60 LMH flux is susceptible to fouling which causes permeability to decrease over time. Apart from that, reversibility at 60 LMH flux operating conditions is dominated by irreversible fouling, so the mechanical backwash process is not enough to restore membrane performance and requires chemical cleaning."
Depok: Fakultas Teknik Universitas Indonesia, 2024
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UI - Skripsi Membership  Universitas Indonesia Library
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Engelbert, Richard
"ABSTRAK

Perpindahan dari satu titik ke titik lain biasa kita kenal dengan istilah mobilitas. Kegiatan berjalan kaki sebagai sarana mobilitas yang telah kita kenal sejak lama membutuhkan perhatian agar kelangsungannya dapat berjalan dengan baik. Mempercepat mobilitas berarti mempercepat pergerakan dengan cara mengurangi waktu yang dibutuhkan untuk berpindah dari satu titik ke titik lainnya. Dalam konteks berjalan kaki, pengurangan waktu tempuh atau peningkatan mobilitas dapat dicapai dengan adanya permeabilitas suatu lingkungan terhadap aktor-aktor pergerakan yang adalah pejalan kaki itu sendiri. Permeabilitas lingkungan diciptakan dari faktor-faktor seperti konektivitas dan aksesibilitas. Dalam arsitektur, permeabilitas tercipta dari hal-hal fisik yang ada disuatu kawasan dan hal non fisik yaitu kenyamanan dari manusia itu sendiri. Skripsi ini akan mengulas tentang apa-apa saja yang seharusnya ada dalam suatu kawasan kota agar kota itu dapat bersifat permeabel bagi pejalan kaki khususnya di kawasan perkotaan dimana cenderung terjadi banyak aktivitas berjalan kaki. Lokasi penelitian berada di dua kawasan berbeda dengan harapan dapat terlihatnya perbedaan dalam hal permeabilitas pejalan kaki oleh perbedaan kondisi fisik yang terdapat di masing-masing kawasan.


ABSTRACT

We have known mobility as an activity that requires movement from one point to another. Activity of moving on foot as a primary mobility choice requires no less attention so that it may go well in practice. To increase mobility means to increase speed of human movement by reducing the time needed for movement from one point to another. In context of walking, reduction of such time or an increase of mobility can be reached by an existence of permeability in a neighborhood toward actors of movement whom we have known as the pedestrian. Permeability of a neighborhood is also formed by factors such as connectivity and accessibility. In architectural context, permeability is formed by physical things that are inside the neighborhood and also by non-physical factor which is the feeling of cozyness that a pedestrian can get from within the place itself. This undergraduate thesis is going to discuss about what should probably exist inside a neighborhood of a city so that the place can be permeable for pedestrian movement especially in a neighborhood where activity of movement/mobility is more likely to happen. Location of study is two different neighborhoods in hope that factors affecting pedestrian permeability will be more obvious by difference of physical condition within each respective neighborhood.

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Fakultas Teknik Universitas Indonesia, 2015
S59715
UI - Skripsi Membership  Universitas Indonesia Library
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Eros Sidney Erriyantoro
"[Lapangan ARA yang terletak di lepas pantai Delta Mahakam modern merupakan lapangan penghasil gas yang berproduksi sejak 2008 hingga sekarang. Sesar Utama yang merupakan sesar normal berorientasi NNE-SSW dengan kemiringan relatif ke arah Timur memisahkan Lapangan ARA menjadi dua panel: Panel Barat dan Panel Tengah. Studi konklusif mengenai sifat sekatan sesar utama ini
diperlukan dalam optimisasi pemodelan geologi dan kelanjutan pengembangan lapangan. Studi internal telah menggunakan interpretasi horizon dan sesar dari seismik 3D beserta data log sumur sebagai dasar utama pembuatan model struktur, fasies, dan petrofisik Lapangan ARA. Prediksi SGR (shale gouge ratio), permeabilitas batuan zona sesar (Kf), dan fault-rock capillary pressure (FRPc) adalah parameter-parameter utama yang digunakan dalam analisis sifat sekatan sesar. Parameter-parameter tersebut di kalibrasi menggunakan analisis reservoir statik dan dinamik berdasarkan data pengukuran tekanan reservoir. Analisis sekatan Sesar Utama Lapangan ARA menghasilkan batas nilai parameter sekatan untuk zona sesar bersifat tersekat, yaitu SGR > 0.39, Kf < 0.025 mD, dan FRPc > 3.3 bar / 47.8 psi. Variasi kapasitas sekatan sesar dikontrol lebih dominan oleh faktor penyebaran reservoir juxtaposition dibandingkan faktor penyebaran
atribut fault throw. Peningkatan perbedaan tekanan reservoir saling kontak antar panel hingga melebihi kapasitas sekatan sesar akibat produksi intensif, menjadi penyebab kebocoran sesar;ARA Field, which is located in offshore area of modern Mahakam Delta, is producing gas since 2008. Main normal fault in the middle of the field separates
the field into two panels: West panel and Central Panel. Conclusive study about the sealing behavior of this main fault is needed in order to optimize geology model and future field development. Internal study has used 3D seismic faults and horizons interpretation with its well
logs as main input to made structural, facies, and petrophysic model of ARA Field. Shale gouge ratio prediction, fault-rock permeability (Kf), and fault-rock capillary pressure (FRPc) are main analyzed parameters used in this research. Those parameters are then validated with static and dynamic reservoir analysis based on available reservoir pressure data. ARA Field Main Fault seal analysis results cutoff value for each analyzed parameters: SGR > 0.39, Kf < 0.025 mD, and FRPc > 3.3 bar / 47.8 psi. Fault sealing capacity distribution is controlled more dominantly by the reservoir juxtaposition distribution than fault throw attribute. Increase of across fault differential pressure in juxtaposed reservoirs that exceeds the maximum fault seal threshold capability is interpreted as the main cause of fault leak., ARA Field, which is located in offshore area of modern Mahakam Delta, is
producing gas since 2008. Main normal fault in the middle of the field separates
the field into two panels: West panel and Central Panel. Conclusive study about
the sealing behavior of this main fault is needed in order to optimize geology
model and future field development.
Internal study has used 3D seismic faults and horizons interpretation with its well
logs as main input to made structural, facies, and petrophysic model of ARA
Field. Shale gouge ratio prediction, fault-rock permeability (Kf), and fault-rock
capillary pressure (FRPc) are main analyzed parameters used in this research.
Those parameters are then validated with static and dynamic reservoir analysis
based on available reservoir pressure data.
ARA Field Main Fault seal analysis results cutoff value for each analyzed
parameters: SGR > 0.39, Kf < 0.025 mD, and FRPc > 3.3 bar / 47.8 psi. Fault
sealing capacity distribution is controlled more dominantly by the reservoir
juxtaposition distribution than fault throw attribute. Increase of across fault
differential pressure in juxtaposed reservoirs that exceeds the maximum fault seal
threshold capability is interpreted as the main cause of fault leak.]"
Universitas Indonesia, 2015
T44240
UI - Tesis Membership  Universitas Indonesia Library
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Nur Inna Alfianinda
"Permeabilitas batuan merupakan parameter penting dalam meningkatkan drilling success ratio dan monitoring reservoir geotermal. Keberadaannya dikontrol oleh fracture akibat stress. Salah satu metode untuk menentukan keberadaan zona permeabel yang dikontrol oleh rekahan atau patahan adalah MEQ microearthquake . Identifikasi dan analisis karakteristik fracture dapat digunakan untuk mengoptimalkan produktivitas. Data gempa mikro tidak hanya memetakan sebaran zona permeabel berdasarkan sebaran hiposenternya, tetapi juga mampu mengkarakterisasi zona fracture berdasarkan analisis mekanisme fokal dan momen tensor. Dari data MEQ lapangan 'X' dengan memanfaatkan waveform lokal tiga komponen telah dilakukan inversi momen tensor. Hasil penelitian menunjukkan bahwa sebaran fracture yang mengontrol permeabilitas memiliki dominasi arah orientasi strike yakni NW-SE dan NE-SW.
Hasil analisis momen tensor menunjukkan pada lapangan bagian Utara di elevasi sekitar 1 km bsl ke atas didominasi komponen implosif, berkaitan dengan pergerakan batuan secara konvergen yang dapat berdampak pada potensi penurunan permeabilitas batuan reservoir. Lapangan bagian Utara di elevasi sekitar 1 km bsl ke bawah menunjukkan komponen-komponen eksplosif, berkaitan dengan pergerakan batuan secara divergen yang mengindikasikan distribusi permeabilitas di lapangan Utara secara keseluruhan tergolong baik. Namun tetap ada potensi dan indikasi penurunan permeabilitas karena jika pergerakan konvergen hasil komponen implosif terus terjadi akibat ekstraksi massa fluida dan tidak diimbangi dengan suplai fluida ke reservoir, maka akan berpengaruh pada sifat fisik reservoir, termasuk penurunan permeabilitas. Selain itu, hasil penelitian ini juga menunjukkan bahwa permeabilitas di zona Selatan cukup besar.

Rock permeability is an important parameter in improving drilling success ratio and monitoring of geothermal reservoir. Its existence is controlled by fracture due to stress. Identification and analysis of fracture characteristics can be used to optimize the productivity. MEQ microearthquake is a method that can be used to determine the existing of permeable zones controlled by fractures or faults. MEQ data not only map the permeable zone distribution based on its hypocenter, but also characterize the fracture zones based on analysis of focal mechanism and moment tensor. Moment tensor inversion has done using MEQ data by utilizing three components of local waveform. The results of this study indicate that the distribution of fractures that control permeability has dominant strike orientation direction ie NW SE and NE SW.
The results of moment tensor analysis show in the northern field at elevation of about 1 km bsl upward is dominated by implosive components, related to convergent rock movement which can impact on potential decrease of permeability of reservoir rock. The northern field at elevation of about 1 km bsl down show explosive components, related to diverging rock movement which indicates the distribution of permeability in the North field as a whole is quite good. However, there are potential and indication of a decrease in permeability because if convergent motion continues to occur due to fluid mass extraction and is not balanced with fluid supply to the reservoir, it will affect the physical properties of the reservoir, including the decrease in permeability. In addition, the results of this study also indicate that permeability in the South zone is considerable.
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Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2017
T-Pdf
UI - Tesis Membership  Universitas Indonesia Library
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Syem Haikel
"ABSTRACT
Metode rock typing adalah suatu metode yang dapat digunakan untuk menentukan nilai permeabilitas batuan dan mengklasifikasikan tipe batuan menjadi beberapa kelompok berdasarkan kondisi batuan sebenarnya. Penelitian ini menggunakan beberapa metode rock typing, yaitu metode Lucia, Flow Zone Indicator FZI, Winland R35, dan Pore Geometry Structure PGS. Penelitian ini menggunakan tiga sumur yang memiliki data core sebagai sumur referensi untuk digunakan metode-metode tersebut. Tujuan utama adalah melakukan komparasi dan memilih metode terbaik dari keempat metode tersebut. Kemudian menggunakan hasil metode rock typing untuk membuat model klasifikasi dan diaplikasikan kedalam sumur target yang tidak memiliki data core. Untuk klasifikasi, penelitian ini menggunakan dan melakukan komparasi metode Na ve Bayes dan Random Forest. Hasil yang diperoleh menunjukkan bahwa metode Lucia dan Na ve Bayes adalah metode rock typing dan classifier terbaik untuk penelitian ini. Kedua metode tersebut memiliki crossplot hubungan AI dan SI yang distribusinya terseparasi dengan baik berdasarkan kelas tipe batuannya. Sehingga untuk penelitian selanjutnya, hasil tersebut dapat digunakan dan diaplikasikan kedalam model seismik.

ABSTRACT
Rock typing is a method that can be used to determine permeability value of rocks and classify rock type in reservoir rocks into different units based on actual rocks conditions. This study uses several rock typing methods, that are Lucia, Flow Zone Indicator FZI, Winland R35, and Pore Geometry Structure PGS. This study uses three wells that have core data as reference wells for those methods. First objective is comparing those four methods and choose the best method for our study. Then, using the result of rock typing method to make a classification model and is applied into target wells that don rsquo t have core data. For classification, this study uses and compares Na ve Bayes and Random Forest method. The result shows Lucia and Na ve Bayes is the best rock typing and classifier method. Those methods able to have AI and SI crossplot which distributed separately well based on its rock type. So for future works, that results can be used and applied into seismic model."
2018
S-Pdf
UI - Skripsi Membership  Universitas Indonesia Library
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