Ditemukan 3217 dokumen yang sesuai dengan query
Suryadi, author
The present
study investigated the mechanical properties and microstructure of ultrafine
grained (UFG) brass processed by four passes of equal channel angular pressing
(ECAP) and annealed at elevated temperatures. The mechanical properties of all
samples were assessed using tensile and micro-hardness tests. Microstructure
analysis was performed using optical microscopy (OM) and scanning electron
microscopy (SEM). Ultimate...
2017
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Yohanes Edi Gunanto, author
We have performed
resistivity measurements as a function
of temperature, with and without
an external magnetic field. Magnetization measurements are also done as a function of
temperature M(T) as
well as a function of an external magnetic field M(H) for La0.73Ca0.27Mn1-xCuxO3compounds with 0...
2017
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Adel Fisli, author
The main problem with the slurry process is the difficulty in recovering the photocatalyst nanoparticle from water following purification. An alternative solution proposed the photocatalyst be immobilized on magnetic carriers, which would allow them to be recollected from the water suspension following treatment using an external magnetic field. Magnetically photocatalyst...
2017
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Muhammad Iqbal, author
Catamaran resistance is very complex compared to monohull resistance, so it is particularly worthy of research. The below-water-level hull form influences the fluid flow characteristics around the ship, which either increases or decreases the total resistance. This study focuses on developing a new hull form by using the Lackenby Method...
2017
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Ketut Suastika, author
The relative significance of
the parallel middle body and stern form in the wake formation of single-screw
large ships and their contribution to the ship?s viscous resistance are studied by using computational fluid dynamics (CFD). A
10450-DWT tanker is considered by varying the ratio of the
parallel-middle-body?s length to the ship?s length (Lmb/L) and...
2017
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Muksin Saleh, author
In this study, modeling of the crossing point temperature (CPT) phenomenon in the low-temperature oxidation of coal was carried out using COMSOL Multiphysics®. Low-temperature oxidation can lead to spontaneous combustion of coal stockpiles. The CPT phenomenon was modeled with the kinetics data obtained from a prior laboratory experimental study. The...
2017
J-Pdf
Artikel Jurnal Universitas Indonesia Library
Research and development activities on Liquefied Petroleum Gas (LPG) vehicles have increased LPG engine performance to that of gasoline engines. LPG evaporation in the fuel system also has a potential cooling effect that can be taken advantage of. The results from previous studies, however, do not explain the level of...
2017
PR-Pdf
Artikel Jurnal Universitas Indonesia Library
Anas Puri, author
The
pavement of the nailed-slab system has been proposed as an
alternative solution for addressing the rigid pavement problem in soft soils.
This system is used for developing a rigid pavement. The simple method of using an equivalent modulus of subgrade reaction (k?) in nailed-slab system analysis was
proposed by a previous researcher. This...
2017
PR-Pdf
Artikel Jurnal Universitas Indonesia Library
Yanuar Haryanto, author
We conducted a finite element simulation by using a computer program, ATENA, to verify
the behavior of T-section reinforced concrete beams strengthened by bonded wire
ropes in the negative moment region with a pretensioned initial prestressing force; we compared this
behavior with that in experimental tests. The simulation was performed on five models...
2017
PR-Pdf
Artikel Jurnal Universitas Indonesia Library
Dwita Sutjiningsih, author
The findings of numerous
studies on the responses of stream quality indicators
to different levels of watershed development have been integrated into an impervious cover model. The focus on one development stressor, namely the
impervious cover, allows the decision makers to use the impervious cover model as a watershed planning tool
to forecast stream...
2017
PR-Pdf
Artikel Jurnal Universitas Indonesia Library