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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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Articles 9 Documents

Search results for , issue "Volume 33, Nomor 1, Tahun 2012" : 9 Documents clear

KARAKTERISASI BLOK REM KERETA API BERBAHAN BESI COR DAN Al-SiC BERDASARKAN KEKUATAN UJI TARIK DAN HARGA IMPAK Senen, Senen; Bayuseno, A.P.
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

The train is currently trusted by the people of Indonesia as a cheap and safe means of transportation. One fromthat must be met by a train is a reliable braking system. Generally the train brake block material is used graycast iron brake block.One of materials based composite as a substitute for train brake block are the Al-SiC (Aluminium SilicaCarbida). The Al-SiC composite material has hard and soft properties. Aluminium (Al) as a matrix and SiC asreinforcement. Metal material composite used for the reseach is Al-SiC composite with composition of SiC 15%,10%, and 15% made through a process of stir casting. The specimens were tested tensile strength and impacttests. The test of results : tensile test for cast iron = 188.56 MPa; aluminium = 131.97 MPa; Al-SiC 5% =127.17 MPa, 10% = 136.41 MPa dan 15% = 107.26 MPa. The result of the energy absorbed of impact test arecast iron = 2.17 Joule; aluminium = 8.67 Joule; Al-SiC 5% = 4.00 Joule, 10% = 4.67 Joule and 15% = 2.83Joule.From the result of test, so replacement of cast iron brake material block is composite brake material block witha composition 10% of AL-SiC.

MODEL DEFORMASI GETAS DI ZONA SESAR KALIGARANG (KGFZ) SEMARANG: STUDI AWAL PENGAMATAN MIKROSTRUKTUR MENGGUNAKAN METODE PETROGRAFI Fahrudin, Fahrudin; Winarno, Tri
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Brittle deformation at Kaligarang fault zone result strain changes. That strain is microstructure.Microstructures can see closely petrography. That observation include grain form, microcrack can form atcontact point like Hertzian and diagonal intragranular microcracks. Grain forms over angular, straight, andconcoidal. Grain of crystal or lithic fragments floating at matrik or cements. Microcrack growth does not onlydepend on stress, but also on temperature and chemical environment, especially of the fluid in the crack.

PROSES PRODUKSI KATALIS ZEOLIT X DAN UJI AKTIFITAS DALAM PROSES PENUKARAN ION KALSIUM Widayat, Widayat; Sadikky DP, A.; Anggraeni, H.
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Zeolie is a material that used in chemical process industry. Zeolite commonly used as catalyst, adsorbent adnion exchanger.Zeolite can be obtained from natural resources and synthetic in industry. The type of zeolitethatused as ion exchanger zeolite X. Zeolite X can produced hy uding hydrogel process and clay process. Thisreasearch was study influencing of temperature and ratio sodium hydroxide (NaOH) to water glass in zeolite Xpreparation. Crystallity of zeolite X was analyzed with X-ray diffraction (XRD) and the activity was used asion exchanger. Response variabel in this research is weight of zeolite X and the capability as ion exchanger.Ion exchange test that used for exchange of calsium. Calsium ion was analizyed by using complexometrymethod. The results of this research shown that zeolit X was obtained in temperature 100oC and rationweight of sodium hidroxide (NaOH) to water glass 1:2. The zeolite X can be used as ion exchanger especiallyfor calsium ion.

BEBERAPA ASPEK PELAKSANAAN 'UNDERPINNING' Dwi Atmanto, Indrastono
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

In areas of dense buildings often found limitations of the land, resulting in the possibility that new buildingfoundation coincides or lies below the existing foundation and excavation leads to instability of the existingfoundation. Similar problem also encountered in the construction of underground infrastructure and old buildingrestoration where the existing foundation must be strengthened. A row of bored pile or diaphragm wall arecommonly used for securing of excavation. Alternatively it is more economical to do underpinning by means ofgrouting, soil nailing and micropile, in which each method has its own advantages and disadvantages. Thesystem of underpinning provides advantages over the diaphragm wall and bored pile because it can support theload directly and saves space. This paper aims to introduce the principles of design, implementation, anticipatedactions and legal aspects of underpinning.

STUDI GEOKIMIA AIR PANAS AREA PROSPEK PANASBUMI GUNUNG KENDALISODO KABUPATEN SEMARANG, PROVINSI JAWA TENGAH Aribowo, Yoga; Nurohman, Heri
TEKNIK Volume 33, Nomor 1, Tahun 2012
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 Kendalisodo 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 about175oC and classified into medium enthalpy system.

MODEL OPTIMASI LOKASI POS PEMADAM KEBAKARAN (Studi Kasus: Kota Semarang) Bagir, Mohamad; Buchori, Imam
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Fire is one of the hazards that often occur in urban areas. Many Indonesian cities usually lack of adequatepublic facilities and infrastructures, including facilities of fire hazard. It is important to reduce the risk of firehazard by optimizing the location of fire stations as facility of emergency around the city, so that the impact oflosses can be reduced. For this, defining the location and distribution of fire station should be well considered.This paper aims to discuss the development of an optimization model for fire stationsâ€™ location, developed basedon the actual quantity of flammable material, building density, accessibility and the road classes, as a networkanalysis model of Geographic Information System (GIS). In order to observe whether the developed model canwork well, Semarang City is selected as the case study.The application shows that the developed model is satisfy and is able to represent 77.29% of the real conditionof the road network. It is also revealed that the fire stations of Semarang City just presently cover 34.32% of itsarea. Therefore, it is suggested to add six new fire stations, located in Kecamatan Ngadirejo, Tlogo Mulyo,Sambiroto, Pudak Payung, Jatingaleh, and Gunungpati.

APLIKASI PENGINDERAAN JAUH UNTUK PERENCANAAN TATA RUANG WILAYAH PESISIR DAN PULAU- PULAU KECIL Pigawati, Bitta
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Our beloved country, Indonesia has planty natural resources both in the sea and it the land. It can be seen to thefact that Indonesia is and archipelago country which has thousands islands. Most of our area is surrounded bythe sea that provides foot resources, mining resources, mineral, energy, and tourism place. In short It can besaid that coastal area is not only as living resources for people surrounding but also supporting our nationalsocial and economic development. In order to use the resources optimally and efficienly it need not only a goodplan but also an integrated management.A plan has become a part of everyoneâ€™s life. It has been used since people realized they need it to solve aproblem. People often get confused between planning and actuating their daily activities, so it needs acomprehensive understanding about what plan means. Plan is a process, process of thinking and actuating it dosomething). Planning acts as an intervening variable between knowledge and action. The essence of planning ispreventative rather than remedial.Spatial planning is a process of area planning system. Master plan of small islands is one of the detail masterplan. Coastal area is a border area between land and sea. The coastal area management is a process to plan, touse, to supervise, and to control the coastal area as well as coastal resources. Master plan is set into some formsbased on its scale or its area to coverage, its detail level, and its focus and attention. Spatial plan is well knownas master plan RTRWN, RTRWP, TRTW Kota/ Kabupaten to design the three master plans takes three phases,they are data compilation, analysis and planning; further more, the three phases are always completed withsome maps to give illustration and comprehensive understanding about phenomena spatially. The integratedcoastal resources management and planning need information about what potention can be developed as well aswhat problems come up.Remote sensing is an observation method or spatial elements measurement of earthâ€™s surface. This effective andefficient method really supports any activities which use spatial approach. Remote sensing data really suit forcoastal area management and planning research due to the large area to investigate and to reach. The use ofremote sensing data for spatial plan has a function for not only completing the existing data but also providingthe newest information. Considering and area developed rapidly it needs available data to monitor and toevaluate the implementation of a master plan. Some problems emerged as a result of using remote sensing dataare such as; limited budged and limited human resources who are able to use remote sensing.

PENGARUH TEMPERATUR SOLAR TERHADAP PERFORMA MESIN DIESEL DIRECK INJECTION PUTARAN KONSTAN Murni, Murni
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

The imperfect combustion process will be a problem in the development effort of diesel engineâ€™s performance.Nonhomogen airâ€“fuel mixing process is one of the factors which cause the imperfect combustion.By heating upthe diesel solar up to a certain temperature before it goes through the high pressure injection pump will lowerits density and viscosity. Therefore, when injected in the combustion chamber, it will formed smaller droplets offuel spray which result in a more homogenious airâ€“fuel mixture. Also by using higher temperature will make thediesel fuel easier to ignite in order to compensate the limited time which is available in high speed operatingconditions. Diesel engine Dong Feng 1 cylinder direct injection at constant speed was used in this research. Thefuel used are solar with temperature variations in the range from 30oC to 70oC . The best thermal efficiency forsolar fuel is 30 % at 60oC with 28 % BSFC. In this condition, the fuel consumption was decreased 4 % bycomparing with that at 30oC.

PENINGKATAN KECEPATAN PROSES PENGERINGAN KARAGINAN MENGGUNAKAN PENGERING ADSORPSI DENGAN ZEOLIT Djaeni, Mohamad
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Drying carrageenan product still deals with low product quality and energy efficiency. The drying with airdehumidified by activated natural zeolite has a potential for drying the product. In this concept, air as dryingmedium was contacted with zeolite to reduce its relative humidity. Hence, the driving force of drying increasesand the process can be conducted at moderate temperature (40-60oC) to retain the quality. This research looksinto the effectiveness of adsorption dryer with zeolite for drying carrageenan. The natural zeolite is activated byheating 300-400oC for 2-3 hours. The zeolite is then used to dehumidify the ambient air as drying medium. Inthis work, the effect of drying temperature and carrageenan thickness on water content in carrageenan duringthe drying were studied. Results showed with air velocity 3.0 m/sec, thickness of carrageenan 1-2 mm,operational drying time 3 hours and air temperature 40-60oC, water content in carrageenan can be reducedfrom 82.0% to 25%. This result is very promising for industrial application.

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