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TEKNIK

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Published by Universitas Diponegoro

ISSN : 08521697 EISSN : 24609919 DOI : -

Core Subject : Engineering,

Engineering

Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.

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Search results for , issue "Volume 32, Nomor 3, Tahun 2011" : 12 Documents clear

PENGARUH PERUBAHAN KECEPATAN KAPAL TERHADAP TINGGI PERMUKAAN AIR DI SISTEM FLUIDA DI DALAM PALKA PADA KAPAL IKAN MUATAN HIDUP TIPE KATAMARAN DENGAN PENDEKATAN CFD Sasmito Hadi, Eko; Manik, Parlindungan; Iqbal, M.
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

The existence and the use of live fish hold system, can help fishermen to reduce the operating costs in fishpreservation 11.8%. The live fish hold system, which fish hold were given circulation hole so the water insideand outside the hatch is connected, there should be researched about the changes and differences in pressurethat happened when the ship moves.Initial condition where the ship is not moving, surface of water in the fish hold will be the same height with adraught of ship. When the ship began to move out, the pressure of fish hold will decrease along with increasingthe speed of the ship. This will caused a decrease of water surface elevation in fish hold.According the calculation and analysis we found on the speed of 12 knots the water surface elevation in hold ispositive with a value 0,3947 m on to 0,20 m diameter of hole circulation (before variation), 0,4515 m on to 0,15m diameter of hole circulation, 0,4656 m onto 0,25 m diameter of hole circulation, 0,4718 m on to 0,20 mdiameter of two pieces of hole cilculation and -0,9410 m for manual calculation with all variations.The optimum hole circulation was chossen at two pieces of diameter of 0,20 m because on the speed 12 knots,the water elevation is 0,4718 m. This value is the higest among the other variations of the cilculation hole

ANALISA FROUDE NUMBER EKONOMIS PADA KAPAL WISATA DI WADUK JATILUHUR DENGAN PENDEKATAN COMPUTATIONAL FLUID DYNAMIC (STUDI KASUS KM. JASATIRTA) Samuel, Samuel; Manik, Parlindungan
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

Model catamarans increasingly popular as a means of transportation of goods and people that needdevelopment to find out more in the interaction prisoners on the ship hull in order to achieve stability and betterresistance. KM Jasatirta is one of ship model catamaran (double hull) which is designed to support tourism inJatiluhur Reservoir. This study aims to find out more details interaction of the total prisoners in the ship's hullKM Jasatirta with Computational Fluid Dynamics approach.Research carried out several stages of manufacture of the Computational Fluid Dynamic model, simulationinput data, running simulations to converge, then analyzes the results of calculations by the methodSlenderBody, Delft Series, 98, and CFD. Analysis of the calculation includes the analysis of resistance, FroudeNumber economic , and comparative analysis of numerical calculation by the method of Computational FluidDynamics.The results of the analysis and calculation of reseach showed that the total ship resistance (Rt) at 2 knots boatspeed by using the CFD method at 0.37 kN, Delft method Series'98 of 0.14 kN, while the calculation method forSlender Body 0.04 kN and a analityc calculation by the method of Millward's of 0215 kN. And based on theresults of analysis of Froude number of the most economical in terms of aspects of the ship's speed is the methodof Computational Fluid Dynamics with a value of 0094 sedangan Fn projection calculation with a quadraticfunction then the value of accurate Fn Series'98 Delft method so it can be used as a reference calculation.

ANALISIS GAS TERLARUT PADA MINYAK ISOLASI TRANSFORMATOR TENAGA AKIBAT PEMBEBANAN DAN PENUAAN Hermawan, Hermawan; Syakur, Abdul; Iryanto, Irwan
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

The lifetime of transformers and its equipments are highly dependent on the quality of insulation system.Insulation is one important component in a transformer because generally, insulations used liquid and solidinsulation in accordance with its function as an insulating material and cooling media. At the time there usedtransformer oil aging and damage caused by several things such as impurities, water content, dissolved gases(Dissolved Gas Analysis-DGA), acidity and heating the oil. Transformers loading will cause a decrease in thequality of the transformers insulation system that resulted in the decreasing age of insulating oil.This paper explained the influence of aging on the rate of degradation of Dissolved Gases of power transformersinsulating oil. This research was conducted using sample data loading and maintenance of transformers byobtained directly with investigations into the transformers which is operating. There are three method todetermine quality of oil transformer i.e. Total Combustible Gases (TCG), Roger Ratio, Key Gas and DuvalTriangle Methods.Based on analysis result by using samples from a variety of loading conditions of the transformers with differentlevels we can conclude the quality and worthiness of insulation oil and the estimated the effective remaining lifeof transformers insulation system.

KAJIAN KARAKTERISTIK DAS TUNTANG DAN MODEL PENGELOLAAN DAS TERPADU Sriyana, Sriyana
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

A low carrying capacity of drainage basin or watershed may cause several problems, where floods occur inrainy season and droughts occur in dry season, also the occurrence of erosion, sedimentation and so on, hasbeen governmentâ€™s problem in watershed management all along. In order to anticipate this condition,characteristic data of a watershed are required, so that it can be used as basic reference of watershedmanagement.The purpose of this paper is to conduct a study on the characteristics of Tuntang watershed of Central JavaProvince and watershed management model.The method of approach uses aspects of watershed geomorphology such as the shape of watershed, elongationratio and circularity ratio approaches, order of river using Strahle method, watershed density using Lynsleyformula, and river gradient calculated based on the comparison between elevation difference and length of mainrivers.Results show that magnitude index of Tuntang Sub watershed has elongated shape with Rc value between 0.27 to0.46, which means that the longer concentration time needed, the lower flood fluctuation. And relatively roundedshape with Rc value between 0.57 to 1.00, which means that the shorter concentration time needed, the higherflood fluctuation occurs. Sub watershed order range from 4 to 6 order, which means that river basins have floodwater level increase (moderately quick to fast), likewise water level decrease. Level slope between 0 - 8 % (lowflow velocity) with an area of 117605.56 Ha, and very steep slope > 40 % (very high flow velocity) with an areaof 4219.09 Ha. The highest drainage density occurs in Sub watershed of Tuntang downstream 1.88 Km / KmÂ²,and lowest Sub watershed of Blorong 1.01 Km / KmÂ². Based on both magnitudes, the water being stored is inmedium category and floods and droughts occur. The flow pattern has the shape of rectangular dendritic anddendritic medium, showing that soil characteristics is limestone and shale. To obtain optimal performance resultof Tuntang watershed, integrated watershed management program is needed in watershed managementintegration by involving various associated parties.

PENGARUH PENAMBAHAN SILIKON TERHADAP SUDUT KONTAK HIDROPOBIK DAN KARAKTERISTIK ARUS BOCOR PERMUKAAN BAHAN RESIN EPOKSI Syakur, Abdul; Novia A, Ika; Sarjiya, Sarjiya; Berahim, Hamzah
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

Currently, polymer materials such as epoxy resin have been used as an insulator in the distribution andtransmission line. Some advantages of using this epoxy resin material having the dielectric properties are betterthan porcelain and glass insulators. On the other side, epoxy resins are also disadvantage the surface ishygroscopic. For the repair was done by adding the surface properties of silicone rubber materialThis paper describes the effect of adding silicone rubber against contact angle of hidrophobicity and surfaceleakage current characteristics of epoxy resin materials ( Di-Glycidyl Ether of Bisphenol A (DGEBA) andMethaphenilene Diamine (MPDA). The study was conducted in the laboratory using the electrode method IEC587:1984 with NH4Cl contaminants. The voltage applied to the epoxy resin sample at 3.5 kV and 50 HzfrequencyThe experimental results showed that the addition of silicon rubber in epoxy resin makes the surface materialcontact angle increases. The higher percentage of silicone rubber, the greater the contact angle and the longertime required for the occurrence of surface discharge.

BAHAYA TEKUK PONDASI TIANG LANGSING DALAM TANAH LUNAK KOHESIF Dwi Atmanto, Indrastono
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

This paper treats the buckling of slender piles completely embedded in soft cohesive soils. Usually these soilswere assumed to behave elastically and were theoretically replaced by horizontal springs supporting the piles.However, soft soils deform as plastic materials. Therefore, it is suggested to assume a lateral supportindependent of the amount of the lateral displacement and accordingly to calculate a model; hereby the safetyagainst buckling of the piles is computed. It is shown that an ideally straight, centrally loaded pile does notbuckle until the stresses in the pile material exceed the elastic range. The shape of the pile axis, however, is mostimportant. Only a very little deviation from a straight line, because the pile is bent elastically or stressles, causesa rapid decrease of the maximum pile-load in dependency of the shear resistance of the soils with the increase ofthe deviation. The proposed model is also applied for eccentrically piles, i.e. a vertical load as well as a bendingmoment act on the pile top

PREDIKSI TEMPERATUR RESERVOAR PANASBUMI DENGAN MENGGUNAKAN METODA GEOTERMOMETER KIMIA FLUIDA Aribowo, Yoga
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

In the preliminary study of Geothermal field development, one the most important thing to observe istemperature capacity of the geothermal reservoirs. One of several method to get subsurface temperature datathat low cost and reliable is geothermometry method. With just surface investigation of the geothermal prospectand fluid geochemistry analysis, it is possible to make a prediction how hot reservoir fluids are. The subsurfacetemperature prediction is based on physical and chemical properties of some chemical constituent. Temperaturedependant solubility of many chemical consituent of geothermal fluids such as silica, chloride, and Na.

OPTIMALISASI EKSTRAKSI DAN UJI STABILITAS PHYCOCYANIN DARI MIKROALGA Spirulina platensis Jos, Bakti; Eko Setyawan, Prayudi; Satria, Yudha
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

The growing awareness of the importance of natural colours especially food and cosmetic colorants has placedgreat demand on biological sources of natural colours. It is for this reason that the phycobiliproteins inSpirulina platensis is gaining increasing attention as an alternative colour for these products. Numerousscientific reports confirm the fact that Phycocyanin from Spirulina platensis, is not only an effective naturalblue colorant, but also a compound that is beneficial to the health of the consumer. The aim of this research is toconduct evaluation studies phycocyanin production by extraction with polar solvents at various concentrationsto obtain extracts for maximum yield. The methods in this study has several stages, namely preparation ofmaterials, extraction, solubility studies of phycocyanin, phycocyaninâ€™s stability test. Changing variables in thisstudy are water, acetic acid 70%, 75%, 80%, ammonium sulphate 50%, 55%, 60%. The analysis of the extractsof phycocyaninâ€™s content using spectrophotometric methods. The observations produces a blue pigment whichhas the highest color intensity with maximum absorbance of 620 nm. Acetic acid 80% is the most effectivesolvent to extract the blue pigment phycocyanin than water and ammonium sulfate. Extraction is influenced bythe pH of the increase in absorption (absorbance) with increasing pH and was not influenced by storagetemperature and time

STUDI KOMPARATIF ANGKUTAN BARANG MENGGUNAKAN MODA LAUT DAN DARAT DI PULAU JAWA Ridwan, Mohd
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

A comparative study of the use of marine and land modes of transportation of goods, aiming to get the value ofgoods transport which is more economical, especially in Java. The output from this study can be used asstepping and the consideration for the government in planning the transport infrastructure of goods and assistemployers to make decisions in order to utilize the mode of transport of goods/ containers that will be marketed.There are many modes of transport that can be utilized in the transportation of goods, namely land modes:Railway containers, trucks/ trailer containers, marine modes: container ship, barge and container ship, RoRocontainer and trailer / truck, so it is necessary for technical and economic studies to assess the transport ofgoods by means of which one is more economical.The results of this study, is the most economical freight rate is the mode of sea transportation of container bargethat only Rp. 13,028,845.93 / TEU (Rp. 651,4/kg).

STUDI GEOKIMIA FLUIDA PANASBUMI DAERAH PROSPEK PANASBUMI NGLIMUT, G. UNGARAN KECAMATAN LIMBANGAN, KABUPATEN KENDAL JAWA TENGAH Brahmo Emianto, Yohanes; Aribowo, Yoga
TEKNIK Volume 32, Nomor 3, Tahun 2011
Publisher : Diponegoro University

Fluid geochemistry is a useful method to analyse lateral and vertical processes and trends in a geothermalsystem, just like a blood and urine analysis to determine the functions of internal organs in human body. Fluidsgeochemistry study in Nglimut Geothermal Prospect has conducted to get information about type andcharacteristics of fluids, to predict reservoir temperature, and sub surface hidrogeochemical cycle model.From fluids geochemistry analysis, the most significant constituent is HCO3, and thus all fluids classified intobicarbonate water. Based on gethermometry analysis, the average reservoir temperature calculated is about206oC and classified into high enthalpy system

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