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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 10 Documents

Search results for , issue "Volume 31, Nomor 2, Tahun 2010" : 10 Documents clear

ANALISA ELECTRODE CONSUMABLE TYPE OK AUTROD 12.10 DENGAN PENGELASAN SUBMERGED ARC WELDING (SAW) PADA BLOCK KAPAL DCV 18500 DWT DI PT. JASA MARINA INDAH SEMARANG Kiryanto, Kiryanto; Sasmito Hadi, Eko
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

In this of globalization is growing very rapidly advancing technology. As well as in shipyard industry is toshipbuilding process. Submerged Arch Welding (SAW) is as joint methode of ship construction. Purpose ofresearch know number of electrodes wich requirement on block welding the ship DCV 18500 DWT in JasaMarina Indah Shipyard Semarang.The specimen experiment used is ST 42 low carbon steel. Variation of plates tickness is 12, 13, 14, 17, 19 and24 mm. Research step is carried out by making the specimen with variation thickness respectively. Specimendimensions length x width is 500 mm x 50 mm. The number of each specimen was made of three pieces. Thendo the measurement welding length, length and weight electrodes and slag welding.The analysis result of data welding on the specimen can be known number of electrode s and fluxs inSubmerged Arch Welding (SAW). The aplication of this research is the block DB 5(p/c/s), SS5A(p/s), SS5B(p/s), UD 5C, and TB 102 (p/c/s. Weight of consumable electrodes is 2185.31 kg (73 roll) and number offlux used wight is 2967.95 kg (119 bag).

PENGUKURAN MOTIVASI KERJA PANITIA PENGADAAN BARANG ATAU JASA PEMERINTAH (Studi Kasus Dinas Pendidikan Provinsi Jawa Tengah) Pujotomo, Darminto; Fanani R, Zainal; Dwi Utomo, Prasetyo
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Improvment Job Motivation need to organization for better job. Aims this reserach is redesign job ofprocurement comitte in Dinas Pendidikan Propinsi Jawa Tengah for improving job motivation. This reserachbased on job characteristic, such various skills, job identification, job significant, otonomy, and feedback. Themethod Job Doiagnostic Survey (JDS) from Hackman and Oldham, used for queaionaire design in comitteprocurerment responden.

OPTIMASI PROSES POLIMERISASI MINYAK KULIT JAMBU METE (CNSL, CASHEW NUT SHELL LIQUID) DENGAN FORMALDEHID Buchori, Luqman
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Jambu mete represents the crop which is a lot of its benefit. From various benefit of jambu mete, there is onepart of which not yet been exploited in an optimal that is husk. Whereas in its husk is contain oil so-calledCashew Nut Shell Liquid (CNSL) about 32-36%. This oil can be used as natural source phenol and alternativelysubstitution phenol from petroleum. This phenol is reacted by formaldehyde will form the phenol formaldehyderesin. Besides containing natural phenol, CNSL also contain the other bunch like karboksilat bunch, alkylbunch and alkenes bunch. This bunch will influence process of forming of phenol formaldehyde resin as aconsequence have an effect on characteristic and quality of resin so that require to be searched the optimumcondition in making of phenol formaldehyde resin. Objective of this research is to look for the optimumcondition in making of phenol formaldehyde resin of novolac type and also know the influence of comparison ofreactant and operating temperature for to resin yielded. Dependent variables in this research are reactorvolume (500 ml) with the volume bases 250 ml, catalyst acid HCl, mixing speed (200 rpm), operating time (90minute), pH (2) and operating pressure (1 atm). Independent variables are CNSL/formaldehyde ratio andoperating temperature. Perceived parameter is free rate formaldehyde. Method is used to design and processdata is RSM (Response Surface Methodology) method constructively the Static program. Result of this researchindicates that the most effect on variable is ratio CNSL/formaldehyde. Optimum condition are obtained at F/Cratio of 0.65-0.85 and temperature of 75-850C with the conversion of 0.55. The biggest rate resin obtained atF/C ratio 0.75/1 and temperature 80oC. This resin is very jell and have best sticky and also drug after runningdry. This novolac resin is applicated as furniture coating. Coating yielded have well sticky with the auburncolor.

EKSISTENSI â€œPASAR SEMAWISâ€ SEBAGAI SALAH SATU STRATEGI REVITALISASI KAWASAN PECINAN SEMARANG Purwanto, Edi
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Revitalization is one of preservation kinds with adapting old building that is impractical to serve new use and inthe same time, to prevent the original characteristics. Revitalization can be done without or with changingbuilding formation. Sometimes, it really cannot be avoided if it is viewed from benefit expense analysis, it doesnot bring benefit to be preserved, so that, let the building faÃ§ade be prevented, thus, the observer can imaginecity face in the past time.Revitalization effort of old city is not merely effort to preserve building, but also effort that has broughteconomic life in the less developed area. Preservation effort at the moment is holistic effort that aims to givebetter society life quality based on old resource power and to do life injection that is interesting and creative andsustainable, with involving society by calculating economy value. Management is instrument to achieve aimincluding society total involvement that is people centered management-oriented.Revitalization of Chinatown of Semarang area shall be read as an effort to bring back Chinatown area that hasethnic specification. Revitalization effort also has aim to bring Chinatown area life as well as to be tourismdestination as it has been implemented in several other countries, like Singapore, Australia, Malaysia andseveral others.One effort to fulfill revitalization of Chinatown area of Semarang is to give activity stimuli that is hoped to beable to be touristâ€™s interest. That interest is â€œPasar Semawisâ€that is night fair in Chinatown area of Semarang.â€œPasar Semawisâ€ is only a part of revitalization. In the other word, if the revitalization is the aim, thus, â€œPasarSemawisâ€ is one instrumen used to fulfill it.

PENYUSUNAN DOKUMEN POTENSI BAHAN TAMBANG DI LUAR WILAYAH SUNGAI KABUPATEN PEKALONGAN Najib, Najib
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Besides in River area, Pekalongan Regency estimated has mineral potential in some areas outside of that area.Yet local government doesnâ€™t have data about the potency of that mineral. In consequence, it is needed toconducts mapping of mineral potency outside of river circumstance that the result will be used by localgovernment either guide taking policy in exploitation or regulation to that activity. This research used somesteps i.e. measurement and mapping phase, analysis and data processing (hypothetic reserve calculation andlaboratory mineral tests such as AAS, petrography and shear strength) and data compilation. The potency ofminerals and rocks is disseminated in 14 districts in Pekalongan Regency. Types of those mine materials areAndesite, Diorite, Limestone, Tras, Clay, Ochre, Gold and iron sand. Mining systems possibly conducted are PitType System, Eunuch Hill System and Cave System.

DESAIN LOADING DOCK DAN PENENTUAN LEVEL STOCK UNTUK MEREDUKSI JUMLAH ANTRIAN DAN PERSEDIAAN PADA AREA PENERIMAAN BARANG (Studi Kasus : Perusahaan Otomotif Internasional)) Santosa, Haryo; Hartini, Sri; Karima R, Meilisa
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Loading docks must be located for easy access by service vehicles and should be separate from public entrancesto the building, public spaces, and other light industrial or warehouse zones. However, it is also important thatthey are designed to ensure the safety and security of their users and the users of other nearby spaces. Thisresearch would be tryied to design the schedule of arrival time and cycle issue in the part preparation. To reducemaximum inventory, this research have been determinated level stock. Its result that the number of queue canreduce from 5 to 2 in each line and maximum inventory can reduce 49%

KONVERSI ELEKTROKIMIA AMONIA MENJADI HIDROGEN Ratnawati, Ratnawati; Sumarno, Sumarno; Nugroho, Amin
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

One of the most dangerous pollutants in wastewater is ammonia. The concentration of ammonia inwastewater discharged from nitrogen fertilizer industry is up to 1500 ppm. Ammonia can be removed byseveral methods such as biological denitrification, air-stripping, and ion exchange. The methods cannotreduce the concentration of ammonia to a low level as required for standard quality of wastewater. Theelectrochemical method has recently attracted attention for the treatment of wastewater containing ammonia.This research is aimed to evaluate the effect of ammonia concentration, current density, and time on theelectrolysis process. Synthetic wastewater containing 500-1500 ppm of ammonia was used in this research.The solution was electrolyzed in a electrolytic cell with Pt/SS electrodes. The experiment was conducted byvarying current density in the range of 5 â€“ 10 mA/cm2 and time from 0 to 105 minutes. The experiment resultsshow that as current density rises, the electrolytic reaction occurs more rapidly. On the other hand, initialconcentration of ammonia has negative effect on the final conversion of ammonia.

PERMODELAN DAN OPTIMASI HIDROLISA PATI MENJADI GLUKOSA DENGAN METODE ARTIFICIAL NEURAL NETWORK - GENETIC ALGORITHM Istadi, Istadi; Rahmayanti, Dian
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Modeling and optimization methods are commonly used, still not able to model and optimize the complexchemical processes non-linear. Hybrid method of Artificial Neural Network-Genetic Algorithm (ANN-GA) isconsidered as an effective method for resolving these problems and obtain optimum conditions globally. Theaim of this study is to develop a modeling and optimization with hybrid ANN-GA methods, which applied inprocess of making glucose from starch hydrolysis. The ANN-GA stategy consists of two steps. In the first step,an ANN-based prosess model is developed. Therefore, the input at ANN model will be optimized using GAtechnique. The optimal values of starch concentration, enzyme concentration, temperature and time with ANNGAmethod were 7,13 % (w/v), 1,47 %(w/v), 40,53ÂºC, and 166,04 min respectively with predicted glucose yieldof 6,08 mg/mL. These result differed from the secondary data (Baskar et al., 2008) which were used RSM. Itwas because R2 values of ANN-GA method was 0,9755. While RSM method was only able to achieved value ofR2 for 0,842. Modeling and optimization with the GA-ANN can be developed and used to obtain the model instarch hydrolysis into glucose and the optimal operating conditions simultaneouosly.

PERBANDINGAN TEKNIS DAN EKONOMIS ANTARA PENGGANTIAN BANTALAN POROS PROPELLER DIBANDINGKAN DENGAN PENGGESERAN POSISI V-BRACKET PADA KMP. KUMALA Budiarto, Untung
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

In the propulsion systems there are three preference components main engine, propeller shaft, and propeller.KMP. Kumala is one for all passengers ship the owner PT. Darma Lautan Utama, there are itâ€™s to experienceproblems to the systems propulsion to happen missalignment between construction v-bracket with sterntube,there are v-bracket to function become to hold up propeller shaft in the inside to find shaft bearing. Effect themissalignment, shaft canâ€™t to turn, so need the realized preparing with the change to shaft bearing shapeexentric and to scrape position v-bracket the position again. In this finish task purporting to know the valuefrom side technics and economics between to realized the change shaft bearing shape exentric with to scrapeposition v-bracket to position again with account time to docking next time. From the result analyse to find thatto change the shaft bearing shape exentric to need faster time, material cost is more expensive, labour cost ischeaper, construction to v-bracket isnâ€™t normaly, than to scrape position v-bracket to need the time is long time,material cost is cheaper, job cost is more expensive, construction v-bracket back to normal the position again,until to moment realization docking next time to need faster time, material cost and job cost is cheaper from tochange the shaft bearing shape exentric.

ANALISA KINERJA KEMUDI KAPAL â€œMV SIRENAâ€œ PADA PELAYARAN PERCOBAAN KAPAL BARU Utomo, Budi
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Every ship building to the after constructed should be done sea trial, it is intended to find out all machinery andequipment in the ship to run well and deserve to normal weather conditions in accordance with the plan. Themain purpose of this study is to know the performance of steering ship MV. SIRENA in sea trial on new ship,because in the operation of a vessel, the steering has a very important role is to ship control or shipmanouvering. After doing sea trial produced several motion graphics board. To ship left spinning PS tacticaldiameter DT = 114,4120 meter and advance = 157,3716 meter, while rotating to the right to ship SB tacticaldiameter DT = 120,9048 meter and advance = 161,9024 meter. There is a difference of 120,9048 â€“ 114,4120 =6,4928 meter in tactical diameter for PS, and 161, 9024 - 157, 3716 = 4,5308 meter in advance, which meansthat the ship sailed round the larger right and left to right, this is due to spin the propeller rotation is right theship sailed toward him continue in the direction of nuts bolts, steering performance of the experimental results ofthe MV. SIRENA after the sea trial, then matched with the demand for ship owners and ship classificationagency, the steering performance of the new ship MV SIRENA can run well which means it can be accepte,because The resulting DT = 6,4928 meter still within the recommended limit is within their rules that is DT =3,45 - 7,50 meter.

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