TEKNIK
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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<![CDATA[PEMANFAATAN PEMETAAN TEMATIK UNTUK ANALISIS KEBOCORAN JARINGAN PIPA DISTRIBUSI DI PDAM DEMAK ]]>
<![CDATA[Sudarsono, Bambang]]>;
<![CDATA[Nugraha, Arief Laila]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6981
<![CDATA[Problems that are often faced by water companies, particularly in PDAM Demak are water leaks in the distribution channel. The problem became a threat resulting considerable loss to PDAM Demak. The problem requires a solution to help the PDAM Demak to analyze the distribution pipelines become more optimal. One method used to solve the pipeline leakage in the distribution network PDAM Demak is doing thematic mapping distribution pipeline represents the actual field conditions. Furthermore the results of thematic mapping is processed through Geographic Information Systems (GIS) can be simulated distribution of water flow conditions to determine the level of water leakage occurs. Simulation results , which is done through software EPANET 2.0, a reference to find out which areas have a tendency to water leaks. The area can be mapped on a thematic map that has been built so as to provide information areas prone to leak water in PDAM Demak. Thematic mapping of distribution pipeline is done by GPS navigation survey. The mapping produces a thematic maps as a basemap for water distribution simulation process. Simulation results illustrate that the village Sidomulyo into areas prone to water leakage with the highest rate of water loss is 24,50% from 44.022 m3of water production in December 2012.]]>
<![CDATA[PERENCANAAN KAPASITAS PEMBANGKIT PLTM SUNGAI LOGUNG KARANGTALUN KABUPATEN TEMANGGUNG ]]>
<![CDATA[Nugroho, Agung]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6721
<![CDATA[Central Java Province intends to improve the use of renewable energy (EBT) such as water resources. Logung river at Ngaliyan subdistrict, Temanggung district has potential energy for micro power plan. The first step to use the water resource is determining the capacity of a mini hydro power plan in accordance with the conditions of the river Logung. Based on the the technical study, the elvation height between the prospective weir with potential power house is 110 m and the effetive height at 105 m. Logung maximum river flow is 11.06 m3/dt, with average flow is 4,77 m3/dt., The minimum flow is 0,75 m3/dt. This electricity power is 10253.12 KW with maximum flow, it will be produced 4848.44 KW at maximum flow 60 %. The minimum flow can deliver 695,28 KW. The suitable capacity for the generator of micro power plants of Logung is 3220 KVA when it is according to manufacture. Key words : power, flow, power]]>
<![CDATA[PENGEMBANGAN MODEL PEMILIHAN RUTE JALAN RAYA BERDASARKAN PERILAKU PENGGUNA MENGGUNAKAN ANT-COLONY OPTIMIZATION (ACO) ]]>
<![CDATA[Siswanto, Joko]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6982
<![CDATA[In the election of the road network usually use road network system optimization considerations with aggregative behavior by determining the shortest route or the lowest cost. Determinants of consumer behavior in route selection and decision-making of the most dominant (disaggregated). Route selection optimization model based on user behavior can be implemented from the results of model development preference with Conjoint analysis. Preferences user behavior seems, is directly proportional to the convenience, the crowd, the facilities, the ease, safety, and inversely proportional to the density. Route selection optimization model with the development of ant-colony optimization formula can be applied with the substitution probability of interaction and preferences as well as the network models incorporate the concept of route selection based on consumer behavior and the physical condition of the network.]]>
<![CDATA[KAJIAN PEMANFAATAN DEM SRTM & GOOGLE EARTH UNTUK PARAMETER PENILAIAN POTENSI KERUGIAN EKONOMI AKIBAT BANJIR ROB ]]>
<![CDATA[L Nugraha, Arief]]>;
<![CDATA[Hani’ah, Hani’ah]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6722
<![CDATA[Tidal flood is a significant threat for the economic growth rate in the city of Semarang. The threat mitigation requires planning, thereby reducing the impact of the losses. The availability of global data with free access can provide solutions in disaster management, the data are SRTM DEM and Google Earth. With both of these data can be mapped potential economic losses caused by tidal flooding. With the techniques of remote sensing and GIS to handle the SRTM DEM data and Google Earth, the techniques can be generated maps and models of tidal inundation area maps woke up in the city of Semarang. Analysis of potential economic losses can be calculated by doing an overlay of the two maps generated. The results achieved from this study is SRTM DEM and Google Earth can able to produce thematic maps of situational tidal flood disaster so that it can be used as a parameter value calculation of the potential economic losses. This study also obtain the result that the area of ​​land affected by the tidal flood an area of ​​8339.31 hectares and the number of buildings reaching 78 299 pieces, which the district that has the highest impact on the tidal flood that North Semarang.]]>
<![CDATA[KOMPARASI NILAI FAKTOR AMPLIFIKASI TANAH DENGAN PENDEKATAN SSA DAN HVSR PADA WILAYAH KECAMATAN TEMBALANG KOTA SEMARANG ]]>
<![CDATA[Partono, Windu]]>;
<![CDATA[Irsyam, Masyhur]]>;
<![CDATA[R.W, Sri Prabandiyani]]>;
<![CDATA[Maarif, Syamsul]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6983
<![CDATA[Several methods for evaluating the effect of site specific condition of soil layers against earthquakes are presently available. Site Specific Analysis (SSA) and Horizontal-to-Vertical Spectral Ratio (HVSR) are two methods commonly used for estimating the amplification factor of soil layers above bedrock. SSA can be performed using subsurface shear wave velocities and dynamic soil properties (density, shear modulus and damping). The HVSR is a simple method for estimating the site amplification factor. Based on the time and budget requirement HVSR is more efficient and effective compare to SSA method.This paper presents result of SSA and HVSR methodscomparison for estimating the amplification factor of soil layers. Two boring locations and six single station seismometer tests were perform within Tembalang District Area.]]>
<![CDATA[RANCANG BANGUN ALAT DISTILASI PEMURNIAN BIOETANOL GRADE TEKNIS BERSKALA UKM : KAJIAN KINERJA ALAT TENTANG DERAJAD PEMURNIANNYA ]]>
<![CDATA[Hargono, Hargono]]>;
<![CDATA[Samodra, Nugraha Bayu]]>;
<![CDATA[Firdausi, Nadia Zahrotul]]>;
<![CDATA[Nugraheni, Agnes Kinanthi]]>;
<![CDATA[Zakaria, Lazuardy R.]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6491
<![CDATA[The technical grade bioethanol can be manufactured by using distillation process at small and medium enterprises. In this research, bioethanol was made from fermentation of  rubber cassava starch (Manihot glaziovii) and gadung starch (Dioscorea hispida). From this fermentation process, 3-8% crude ethanol was produced. To achieve the objective 2-stage distillation units were designed to purify the crude ethanol product. Bioethanol produced from 1st and 2nd distillation units were of 35 and 94% purity respectively corresponding to the technical specifications desired. The design of 2-stage distillation units has been completed, included the shape and dimensions of the units, i.e. the main condenser, cylindrical in shaped, dimensions of diameter was 32cm and height was 45cm, cylindrical in shape  feeder tank/boiler, small scale volume of 5L, which can be scaled up to 65L. At 2nd distillation column, the diameter was 9cm and length was 121cm. The column was isolated using ori type bamboo filled with glasswool as isolator. The columns were filled with ceramic or glass type packing inside. The columns were equipped with thermometer to measure the temperature of ethanol-water vapor. Key words: crude bioethanol, design of 2-stage distillation, technical grade bioethanol]]>
<![CDATA[STUDI PENGARUH VARIABEL-VARIABEL DALAM CFD UNTUK MENGHITUNG KOEFISIEN TAHANAN KAPAL ]]>
<![CDATA[Chrismianto, Deddy]]>;
<![CDATA[Manik, Parlindungan]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6724
<![CDATA[Commonly, the Computational Fluid Dynamic (CFD) analysis using the finite volume method, solid modeling is usually used in the early stage in order to prepare a mesh process before the computational process is executed. In this paper the CFD analysis must be executed to obtain a resistance coefficient value, and the verification should be done to ensure a result is close to experimental data. In the CFD analysis, some parameters have been taken into account, including the variation of domain dimensions, variation of mesh sizes, and variation of boundary conditions, in which the comparison between the numerical analysis and experimental data showed good agreement in general. The result of the case no.1 has a smaller difference of the resistance coefficients to the experimental data than other cases, in which the total resistance coefficient (Ct) has a difference about 1.95% of experimental data, the friction resistance (Cf) has a difference about 0.83% of experimental data, and there is a difference about 6.30% of experimental data for the residual resistance (Cr).]]>
<![CDATA[OPTIMASI POSISI PILOT MENGGUNAKAN ALGORITMA GENETIKA UNTUK MENINGKATKAN KINERJA Wi-Fi 802.11n ]]>
<![CDATA[Syafei, Wahyul Amien]]>;
<![CDATA[Nasution, Yunda Kumala]]>;
<![CDATA[Sukiswo, Sukiswo]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6984
<![CDATA[Wi-Fi is wireless communication technology that used widely not only for accessing the internet but also communicating data, image, voice and video. The newest wi-fi technology is 802.11n as an extention of 802.11a/b/g. By  combining OFDM and MIMO techniques it can provide throughput up to 600Mbps. One of important factors to achieve such high throughput is the pilot position in training sequence. Wi-fi802.11n allocates it’s pilots orthogonally. This research optimizes the pilot location using Genetic Algorithm Differential Evolution. Optimum pilot position improves the accuracy of synchronization which leads to enhance the performance. The invented optimum pilot position set then be implemented into wi-fi 802.11n simulator to be analyzed the performance enhancement which represented in grafic BER vs SNR curve.Run test under channel model B and D proof that the invented optimum pilot position gives performance enhancement of 0,5 dB and maintain it’s stability compared towi-fi 802.11n system with  set ortogonal pilot position.]]>
<![CDATA[KAJIAN PEMODELAN ARUS DAN SEDIMEN DI SEKITAR JETTY MUARA SUNGAI ]]>
<![CDATA[Parmantoro, Priyo Nugroho]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6568
<![CDATA[The use of models in the design of jetties at the river mouth is intended to achieve efficiency and predict the function of events forces the river and marine hydrodynamics in a variety of scenarios handling of sedimentation in the estuary. One of the aspects of impacts of current changes that are modeled around the estuary in both the condition before treatment and after a jetty. While other aspects that need to be considered is the hydraulics of the river in the upper-estuary, shoreline change and ocean wave characteristics around the mouth of the river jetty. To be able to know the current pattern of movement around the mouth of the river jetty used models of Surface Water Modeling System (SMS) As a research object is used Silandak Jetty. It has the data before the jetty was built so that could be compared with the condition in which the jetty has been built. Current survey results that occurred in these waters is caused by tidal forces and non tidal. Due to the influence of tides, currents tend to back and forth in a certain direction (from the sea into the estuary). While the non-tidal forces tend to be dominated by the longshore current (caused by the influence of the wave). The simulation result shows a flow that at low tide the sea water circulation in the waters in Silandak moving toward the west to the northwest while the tide moves in the opposite direction heading east with a range between 0,05 to 0,25 m/sec. Sediment modelling shows that flushing sediment has effectively result. Key words: Jetty, Current, Sediment]]>
<![CDATA[KORELASI PENURUNAN MUKA TANAH DENGAN PENURUNAN MUKA AIR TANAH DI KOTA SEMARANG ]]>
<![CDATA[Yuwono, Bambang Darmo]]>
<![CDATA[ TEKNIK Volume 34, Nomor 3, Tahun 2013 ]]>
Publisher : <![CDATA[Diponegoro University ]]>
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DOI: 10.14710/teknik.v34i3.6725
<![CDATA[The characteristics of the pattern of land subsidence need to be mapped for the purposes of planning and structuring the city as well as taking appropriate actions in anticipating and mitigating the impact. These characteristics can be determined by combining the land subsidence measurements done with various methods such as levelling, GPS, direct measurement and InSAR. Land subsidence that occurred in Semarang had a rate that varied between 0 - 13 cm / year with an increasing trend towards the north east (northeast) of Semarang. The areas which had a high rate of land subsidence between 9 -13 cm / year included PRPP, Tanjungmas, Terboyo and Kaligawe. In this paper will show spatial distribution of landsubsidence which have identical pattern with the change of ground water level .Observations GPS method has a high correlation with changes in ground water level reaches 0.956 compared with InSAR observations, GPS, direct observation]]>
