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Karakteristik Pasang Surut Laut di Pulau Jawa
Get PDFSea tides are cailsed by atlraction of heavenly bodies especially moon and sun to the envelope of sea water of lhe earth. At different places of the earth, sea tides characteristics are different.Sea tides raw data collected from several sea tides stations in Java island are processed using sea tides computer software and amplitudes of sea tidal constants are determined. Based on Formzal formula, Formzal numbers are calculated, and sea tides characteristics areinterpreted. Linking lhe sea tides characteristic infurnntion to the digital map of Java island, sea tides characleristics map is discovered.The result of the research is information on sea tides charateristics for Jova island. Normally, mixed sea lides characteristics are discovered in Java island. Many users, e.g. hydrographic surveyors, fishermen, coaslal engineers, elc. need sea tides characteristics information for their works.Keywords: sea lides, Formzal nurnbers, Java island
Analisis Hidraulik Sistem Drainasi di Lahan Gambut Lapangan Minyak Duri Caltex Pacific Indonesia Riau
No full textDuri Field covers an area of approximately 9500 hectars that will be developed with steam injection (steamflooding) into I3 areas. During rainy season, several part of the Duri Field are inundated by rain water that disturbing the operation of the exploration. The problent of inundation in The Duri Field Area that endanger the CPI focilities could be caused by limited canal capacity and bad performance of hydraulic stuctures, change of Rainfall – Runoff relation due to the change of infiltration capacity of the watershed area, land subsidence due to excess load and ground water extraction. Unfurtunately, part of the Duri Field is laid down on the peat soil dome that is subject to land subsidence under an intensive drainage.The important issues in developing a peat lands are land subsidence due to shrinkage and changes to peat properties. Oxidative changes are irreversible. The effort of draining the excess run-off water by increasing the existing canal capacity shall in no way cause for over-draining and lowering the gyound water level during dry season. The drainage system shall be designed to maintain this ground water level to avoid any soil subsidence and drying the peat. An hydraulic simulation to analyze the probable ground waler extraction is performed.The result of conventional hydraulic simulations require a widening and deepening part of the primary canal. This channel improvement will increase the drainability, but in the other side could prontote the lowering of water table, peat oxidation and land subsidence. Instead of channel improvement, increasing the elevation of Duri Field facilities above flood level and developing collector drainage channel along the border of Duri Field are suggested. Keywords: drainage, peat soil, subsidence
Karakterisasi Aliran HilirKipas Aksial sudu Datar Variasi Span Sudu dan Sudut Serang
Get PDFAbstract The velocity field downnstream of an axial fan was measured using probe 55 P 51 of a Hot Wire Anemometer to investigate characteristic of the flow. Flat blades werevaried in length of blade's span and angle of attock. The length of blade's span was varied at 0.3, 0'5, 0.75 and l times of 450 mm, at various angles of attack at 5º, 10º and I5º, while it was operated at constant speed of 610 rpm. The measurement was conducted at vertical distances 210, 360, 510 and 660 mm from the fan. The investigation was focused on the mean velocity in axial and tangential directions at measurement position 210 mrn. Properties of theflow were computed based on integration of Reynolds momentum and continuity equations for determining flux of axial and angularmomentum. The performance of the axial fan was determined by comparing values of torque, thrust, volume rate and consumed power. The swirling number of the flow was also calculated as a consideration to determine performance of the axial fan. Results indicate that operating the axial fan in variation blade'sspan have significant effect to the value of axial and tangential mean velocities and the area off low, meanwhile variation in angle of attack just influence to the value of axial and tangential mean velocities. Increasing ofblade's span at constant angle of attack If increases volume rate, torque, and thrust of flow and consumed power oJ'the fan. Investigation of increasing angle of attack at span blade 450 mm also increases those values. Span blade 450 mm at angle of attack l5º have a highest performance and consumed power. It can be shown also that swirling increase with respect to increase of angle of attack. Keywords: velocityfield downstream axial flowfan, span's blade,angle of attack
Unjuk Kerja Reaktor Cuscade Bentuk Kolom
No full textAbstractSome heterogeneous reactions such as liquid-solid, liquid-liquid were undertaken in the stirred tank batch reactor. To change a batch process into flow process, plugflow resctor is the reactor with the similar performance to the batch reactor. However, it would be faced withproblem to attain the plug flow pattern. A cascade of ideally mixed reactor was reactor which has a similar performance u,ilh the plugflow reactor especiallyfor heterogeneous system.Experinrent was wrdertaken in the column which was divided into three sections. This is similar with the three mixed flow reactors. Sodium chloride was used qs a tracer and water as fluid flow. It was investigated two variables such os stited speed and ratio of impeller diameter to the distance ofthe cascade.In this paper, Bodenstein number of pipe flow reactor and the number of stages for the cascade were determined experinrentally from the residence time distribution of the tluid. It is shown that the results good agreement with the empirical equation proposed by Pawlowski (1962) and Elgeti (1996)
Pemanfaatan Sistem Informasi Geografik untuk Penentuan Bank Tempat Pembayaran Pajak Bumi dan Bangunan Pelaksana Payment Online System
No full textThe research aims to do the spatial analysis in selecting banks for paying land and building tax (Tp banps) which will be nominated as POS banlrs (Payment Online System) banks in Bandung city by applying GIS (Geographic Information Systems) technology.GIS spafial analysis was conducted using three coverages; administrative boundaries of Bandung city, land use, and distibution of TP banlcs, including their corresponding attribute data. verything technique and overlay operations using Arc/Info GIS software were conducted to select the priority of TP banks based on some determined criteria.Nineteen Tp banks were nominated as POS, eight of them were considered as the major priority where their locations are equally distributed in Bandung city.Keywords: tax, geographic information systems, spatial analysis
Model Pemilihan Angkutan Sekolah : Studi Kasus Kawasan Kotabaru, Yogyakarta
No full text)Alumni Jurusan Teknik Sipil Fakultas Teknik UGMSigit PriyantoJurusan Teknik Sipil & Magister Sistem dan Teknik Transportasi UGMAbstractWith it's title as a city of student, Yogtakarta has a large amount of students which isaround 105,684 students, Iiving in Yogtakarta city. Therefore, it was concluded that trafic inYogtakarta could be much influenced by students. The intention of this research is tounderstand the characteristics of students traveling with private cars, and if they are offeredpublic transportation and they choose it. Therefore the congestion can be reduced.The stated preference method is applied to this study to investigate the response of privatecar passengers to shift in public transportation in school troveling.The results showe that if the public transport is available they may be choose it rather thanprivate cars.Keywords: public transport, private car, school travelin
SIFAT-SIFAT GEOTEKNIK BAHAN TIMBUNAN INTI KEDAP AIR BENDUNGAN BATUTEGI
No full textSoil was already widely used as watertight materials in the embankment dam engineering, where as, the selection and treatment (compaction) will in/Iuenced the geotechnical properties.As a water tight material the soil used should be impermeable for controlling seepage and hwe efficient shear strength for controlling stability.The aim of this research was to analyze the soil laboratory test results of core embanlcrnentmaterials obtained during the soil investigation and the construction stages of the Batutegi dam,a 125 meter in height of earth-rockfill dam in Lampung, Indonesia. The research analyzed thegeotechnical parameters and the intercelations of the geotechnical parameters in order to indicate the geotechnical properties of the core embankment materials. The evaluation of the geotechnical parameters from the soil laboratory tests indicated that in term of density, permes-bility, swelling characteristic, compressibility as well as the strength, the core moterials used at Batutegi dam meets the requirement as watertight materials in the embankment dam engineering.Keywords: geotechnical properties, embankment dam, water tight materials
Optimasi Kinerja Pompa Sentrifugal Produk Lokal dengan Modifikasi Impeler dan Analisis visualisasi Aliran
No full textA preliminary efort to inrprove an impeller design for domestic centrifugal pump with 165 mm outlet diameter, semi open impeller has been initiated implementing flow visualization method. The study was focused on several impellers having different inlet and outlet angles, each of them has the same blade thickness.A facitity has been constructed to measure the performance for those impellers at similar speed, 200b rpm. The visualization technique applied in the study was wet paint method applying point on the surface of the impellers with several layers of dffirent colors and wetness.Impellers hwing optimum inlet ond outlet angles have been identified.Keywords : impeller, flow visualizatio
Provenance Study and Tectonic Implications on Rock Sequences in The Lengguru Fold Belt of Western Papua: Constraints from Zircon Fission Track Thermochronology
No full textThe present zircon fission track thermochronologt study reveals Triassic to Pliocene source terrains supplying clastic materials into the present successions in western Papua. The provenance of sedimentary rocks in the region appears to have associated with igneous activities, suggesting an episode of tectonic events in Mesozoic and Cenozoic. Importantly, the Pliocene Buru Formation in the Lengguru Fold Belt contains abundant Paleogene volcanic zircons, which might have been derived from erosion of the Weylond Terrane in the latest Miocene-Pliocene. This suggests the Weyland Terrane was part of the Paleogene 'Caroline Arc, that was eroded after Lute Miocene collision with the western Papua microcontinent. The main compressional pulse in the studied area occurred from -12-4 Ma. The deformation in the mountainous belt in western Papua from 4-0 Ma has been dominated by transpression. This transpressional regime continued in the fold belt, but with less convergence. Meanwhile, compression continued in the frontal part of the Lengguru Fold Belt, creating Pleistocene foldingfeatures such as the Buru Anticline, the Umar Anticline, and the Poronggo Anticline in the eastern Lengguru Fold Belt section. At the present day, transpression is occurring along theTarera'Aiduna Fault with ongoing uplift of the western Papua Fold Belt. However, extension and subsidence are occurring in the Lengguru Fold Belt southeast of Cendrawasih Bay.Keywords : sedimentary rocks, zircon fission, transpressio
Pengaruh Kecepatan Pendinginan Terhadap Perubahan Volume Leburan Polymer Crystalline dan Non-Crystalline
Get PDFAbstractThe study was directed to develop a method to predict the influence of the rate of cooling to the degree of crystallittitv (DOC) and volume change of crystalline polymers. Crystalline polymer melts exhibit volume shrinkage on cooling below melting point due to crystallization. Crystallization and volunrc shrinkage will proceed with varies rate as long as the temperature is above the glass tansition temperatrre. DOC achieved by polymer is not only determined by the inherent crystallinity of the polymer but also influenced by the rate of cooling. Onfast cooling, inherently crystalline polynrer may have zero DOC. This incompletely crystallized polymer will crystallize and experience volume shrinkages on prolong usage at temperatures above glass transition temperature. A mathematical model and a kinetic model of crystallization based of modification of Avrami equation were solved sintultaneously to give temperature and DOC distributions as ftmctions of time for various rote of cooling. Rate of cooling was varied by changing the water hath ternperalure. Labotatory measurement was done to verifu the predicted temperature profile and average degree of crystallinity. The simulated tenxperature profiles as well as average degree of crystallinities give good agreements with experimental results.Keywords: polymer, degree of crystallinity, cooling, melting point, crystallization, volume shrinkage, moldin