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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 "vol 30, no 2 (2009)" : 10 Documents clear

PENURUNAN KANDUNGAN PHOSPHAT PADA LIMBAH CAIR INDUSTRI PENCUCIAN PAKAIAN (LAUNDRY) MENGGUNAKAN KARBON AKTIF DARI SAMPAH PLASTIK DENGAN METODE BATCH DAN KONTINYU (Studi Kasus : Limbah Cair Industri Laundry Lumintu Tembalang, Semarang) Irawan Wisnu Wardhana; Dwi Siwi Handayani; Dessy Ika Rahmawati
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Increasing the number of laundry industry influences on the increasing of detergent utilizzation. Thedominant substance contained in the detergent is Natrium Tripolyphosphat, a builder and surfactant.Therefore the waste contains Phosphate. Most of the laundry industry throw their waste without treatmentfirst. The waste would cause Eutrofication where the water body became rich of dissolved nutrient,descending of the dissolved oxygen and capability of water body assist power to water biota. Lumintu isone of the laundry industries which located in Tembalang district. According to the result of preexperiment,industrial waste water containes 10,21 mg/l phosphate. This value exceeds standard quality ofPerda Prov. Jateng no. 10 year 2004 about maximum value for total of phosphate is 2 mg/l. One ofwastewater treatment method is adsorption using the active carbon from plastic rubbish kind ofPolyethylene. This reseach purposes to know the capability of active carbon from plastic rubbish inreducing phosphate content with batch and column operation. The batch operation use 1,2 and 3 gramvariation weight active carbon from plastic rubbish for 30 - 60 mesh and 100 - 200 mesh variation mediasize. The batch operation has 45,45 % from the highest phosphate efficiency lowering on the 3 gram.Otherwise, column operation need 1 inch column diameter with 50 ml/minute and 100 ml/minute debitvariation. Continue trial had 54,75 % from the highest phosphate efficiency lowering on the 50 ml/minute.Constant value speed (k1) is 0,0108 ml/mg.s with capacity of adsorption (qo) 0,677 mg/g.

PEMAKAIAN BALING-BALING BEBAS PUTAR (FREE ROTATING POPELLER) PADA KAPAL Eko Julianto Sasono
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Propeller as a means of ship activator expand in phase for the shake of phase. Although that way in this timepropeller represent the mechanical ship activator appliance is which is at most used for the ship of from allsize measure and its type. Pursuant to the reason is above need of research and attempt to increase efficiencyof propulsi ship. One of research and attempt which have been done/conducted by free propeller turn around.Which free propeller turn around this exploit the free energi stream rotation (slip stream) from especialpropeller, while as ordinary propeller of this propeller can alter from free stream into energi push ( trusht )

KAJIAN KELAYAKAN KEGIATAN PERTAMBANGAN BAHAN GALIAN GOLONGAN C DI KECAMATAN CEPOGO KABUPATEN BOYOLALI Najib Najib; Junaedi Junaedi
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Sand and Gravel mining activity in Cepogo District come out pro and contra in that society. This researchaims to figure out the impact of mining from physical aspect. Parameters used in this research such ascondition and mining activity, hydrology, erosion, land exchanged, infrastructure condition, mass wasting,land use and reclamation effort. From those parameters are counted mining properness in those locations.According with data analysis, mining activity in eight villages in Cepogo District has improper mining(e.g. Gedangan, Sumbung, Paras, Mliwis, Sukabumi, Cepogo and Cabean Kunthi) and in one location isvery improper mining (Wonodoyo). This condition due to mining didn’t follow good mining practice(GMP).

PEMBUATAN PUPUK FOSFAT DARI BATUAN FOSFAT ALAM SECARA ACIDULASI Faleh Setia Budi; Aprilina Purbasari
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Phosphate rock containing P2O5 can be used as raw material of phosphate fertilizer. Phosphate rock canbe found in many areas in Indonesia, but its P2O5-content is relative low. In this research, phosphate rockfrom Rembang (P2O5-content 11.37%) is used as raw material for phosphate fertilizer production byacidulation process using phosphoric acid solution. Operation variables are phosphoric acid concentration(10, 20, 30, 40 %-vol), spraying model of phosphoric acid solution (one hole and many holes), andspraying position of phosphoric acid solution (end, centre, end & centre). The result shows that theincrease of phosphoric acid concentration is proportional to P2O5-content in phosphate fertilizer withhighest P2O5-content in the amount of 18.29%. One-hole spraying model and end-position spraying giveshighest phosphate fertilizer yield in amount of 169.5 grams.

PENYUSUNAN RENCANA INDUK PENANGANAN KAWASAN RAWAN BENCANA DI KABUPATEN SINTANG, KALIMANTAN BARAT Najib Najib; Wahju Krisna Hidayat
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Sintang Residence is a region which has susceptible region of natural disaster mainly landslide and flood.As the result of that vulnerability, it is needed to do the research to determine zonation of susceptibility ofdisaster. Zonation of landslide is based on four parameters such as slope, annual rainfall, geology factorsand land use. Zonation of flood is based on monthly/daily rainfall, land use, topographic condition andflood terrains. Based on secondary data and primary data, Sintang residence can be divided into threesusceptibility landslide zones, i.e. intermediate, low and very low susceptible landslide zones. Susceptibleflood zones are divided into three zones i.e. high, intermediate and low susceptible flood zone. Landslidesin that area are happened due to some factors; among other things are the rocks weathered, high slopedirection and no retaining wall. Flood is happened mostly due to the position of residences which straightforward or less height toward river water level and that location near with the rivers. Flood occupied theresidences mostly pass terrain edge river or pass by Sub River or rubbish ditch that ended in the mainriver. The purposes of mitigation those disasters based on the land use

KUANTITAS DAN KUALITAS RUANG TERBUKA HIJAU DI PERMUKIMAN PERKOTAAN Agung Dwiyanto
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Green Air-Gap management in area of settlement urban tend to to experience of the challenge which enough weightof effect about height of urbanization current. while on the other side, energy support the downhill existing socialand environment also, so that cannot make balance to the requirement of space of effect about human pressure .Other challenge go together the height mount the conversion or displace to utilize the farm from farm (especiallyagriculture farm become the area develop;builded) generating impact to lowering environmental quality nyabecome green of urban. Evaluate the planology is exist in generally only study the aspect of accuracy or deviation ofspace according about zoning which already specified . Meanwhile its exploiting intensity change seldom debate, sothat need the new stages;steps to improve;repair the quality and existing amount green space.

PEMODELAN TIME-DEPENDENT BEHAVIOR MATERIAL DENGAN MENGGUNAKAN ELEMEN SPRING DAN DASHPOT Hardi Wibowo
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

To model behavior of material, there are two basic models of the material element i.e.: spring and dashpot.In many cases, time-dependent behavior of a material can not enough be used just one or two basic modelof the material element. To model time-dependent behavior of a material, combination of many basicmaterial elements should be used. The most important of long term behaviors of concrete material is creepbehavior. Many equation of creep prediction of the concrete materials have been proposed to manydesign specification and rule design, i.e.: American Concrete Institute (ACI), CEB/FIP 78 and 90, Bażant-Panula, Sakata, etc. This paper will be considering and demonstrating how to model creep compliancebased on creep coefficient as used by ACI-209 by using assembly of those basic material element

SIMULASI FILTER KALMAN UNTUK ESTIMASI SUDUT DENGAN MENGGUNAKAN SENSOR GYROSCOPE Wahyudi Wahyudi; Adhi Susanto; Sasongko Pramono H; Wahyu Widada
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

The Kalman filter is a recursive solution to the process linear filtering problem that can remove the noisefrom signal and then the information can useful. The process that use Kalman filter must be approximatedas two equations of linear system, state equation and output equation. Computation of Kalman filter isminimizes the mean of the square error. This paper explore the basic consepts of the Kalman filteralgorithm and simulate its to filter data of gyroscope to get a rotation. The measurement noise covariancedetermines how much information from the sample is used. If measurement noise covariance is high showthat the measurement isn’t very accurate. The process noise covariance contributes to the overalluncertainty of the estimate as it is added to the error covariance matrix in each time step. If the errorcovariance matrix is small the Kalman filter incorporates a lot less of the measurement into estimate ofrotation.

ANALISIS TRAFIK SUARA JARINGAN KOMUNIKASI TELEPON PT. BADAK NGL BONTANG – KALIMANTAN TIM Ajub Ajulian Zahra; Nur Muhammad Giri Laksono
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

In time being, the user of telecommunication provider is growing up, both of voice and datatelecommunication, so it is needed to design a good and accurate telecommunication tools to avoidproblem’s user. In this case, PT. Badak NGL Bontang needs to review the telecommunication tools(number of trunk) because of reducing the number of employee for re-organization.In this paper, application programme is made to analyze voice traffic data with the result that to determineoptimalization number of trunk. Work and condition of system in traffic analysis is influenced by trafficparameters, like ASR (Answered Seizure Ratio), SCH (Seizure per Circuit per Hour), MHTS (MeanHolding Time per Seizure), dan GOS (Grade of Service).From traffic analysis, optimalization number of trunk is 33 trunks with the value of grade of service is 0,1%., so the efficiency number of trunk in PT. Badak NGL is 41,25 % which is determined from comparisonthe number of trunk in traffic analysis (33 trunks) and the number of trunk in PT. Badak NGL Bontang (80trunks), so with 33 trunks, the probability of blocking is still low. In traffic analysis, the condition of systemwill be busy if the value of real grade of service is higher than the value of grade of service which isdetermined, and the condition of system will be normal if the value of real grade of service is lower thanthe value of grade of service which is determined.

PENERAPAN KEBIJAKAN PENJADWALAN ULANG PADA RUANG LINGKUP SINGLE MACHINE UNTUK MEMINIMASI TOTAL TARDINESS (Studi Kasus di PT. Indonesia Steel Tube Works) Denny Nurkertamanda; Zaenal Fanani; Anna Kusuma Wardhani
TEKNIK Vol 30, No 2 (2009)
Publisher : Diponegoro University

Customer satisfaction is the most important thing to be considered to keep the customer trust of a productor even of a company. Giving the satisfaction to the customer can be achieved by several ways and on timedelivery product is one of them. It is true that some problems can often occur during that achievement andmay hinder the on time delivery fulfillment. One of the major elements that hold the key role of on timedelivery fulfillment is production scheduling. The implementation of appropriate production schedulingpolicy will determine the accomplishment of on time delivery fulfillment in some ways. This statement isalso works for Indonesia Steel Tube Works Ltd., as a company that always cares about the customersatisfaction on quality and on time delivery. If we observe the production scheduling records of IndonesiaSteel Tube Works Ltd. we can find some lateness problems that in some case happened in an extensiveinterval of tardiness. The company only runs the production scheduling based on the group of pipediameter. This policy seems cannot well handle the rush orders that often emerge on every schedulingperiod and effect in tardiness problems. The company needs to consider the rescheduling policy with theaim of reducing the tardiness that often emerges because of the rush order disruption.

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