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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 "vol 34, no 3 (2013)" : 9 Documents clear

PEMANFAATAN PEMETAAN TEMATIK UNTUK ANALISIS KEBOCORAN JARINGAN PIPA DISTRIBUSI DI PDAM DEMAK Bambang Sudarsono; Arief Laila Nugraha
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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.

PERENCANAAN KAPASITAS PEMBANGKIT PLTM SUNGAI LOGUNG KARANGTALUN KABUPATEN TEMANGGUNG Agung Nugroho
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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

PENGEMBANGAN MODEL PEMILIHAN RUTE JALAN RAYA BERDASARKAN PERILAKU PENGGUNA MENGGUNAKAN ANT-COLONY OPTIMIZATION (ACO) Joko Siswanto
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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.

KAJIAN PEMANFAATAN DEM SRTM & GOOGLE EARTH UNTUK PARAMETER PENILAIAN POTENSI KERUGIAN EKONOMI AKIBAT BANJIR ROB Arief L Nugraha; Hani’ah Hani’ah
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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.

RANCANG BANGUN ALAT DISTILASI PEMURNIAN BIOETANOL GRADE TEKNIS BERSKALA UKM : KAJIAN KINERJA ALAT TENTANG DERAJAD PEMURNIANNYA Hargono Hargono; Nugraha Bayu Samodra; Nadia Zahrotul Firdausi; Agnes Kinanthi Nugraheni; Lazuardy R. Zakaria
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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

OPTIMASI POSISI PILOT MENGGUNAKAN ALGORITMA GENETIKA UNTUK MENINGKATKAN KINERJA Wi-Fi 802.11n Wahyul Amien Syafei; Yunda Kumala Nasution; Sukiswo Sukiswo
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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.

KAJIAN PEMODELAN ARUS DAN SEDIMEN DI SEKITAR JETTY MUARA SUNGAI Priyo Nugroho Parmantoro
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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

KORELASI PENURUNAN MUKA TANAH DENGAN PENURUNAN MUKA AIR TANAH DI KOTA SEMARANG Bambang Darmo Yuwono
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

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

PENGARUH PERUBAHAN FUNGSI RUANG TERBUKA PUBLIK DI KOTA LAMA SEMARANG TERHADAP CITRA KAWASAN Fadzilla Rizka; Titien Woro Murtini; Atik Suprapti
TEKNIK Vol 34, No 3 (2013)
Publisher : Diponegoro University

Old City in Semarang as cultural reservation by Semarang undergone several changes over the times. One of that is change the function of public open space, every space change in an area affects on the image of the Old City in Semarang as the historical area. In the end, the change of public open space function affects on the image of The area of Old City in Semarang as Historical Area which existence is reserved. The purpose of this research is to acknowledge effects caused by the change of public open space function according to era development on the image of The area of Old City in Semarang as historical area fulfilled with buildings which have colonial architecture style. However, there are two kinds of variables in this research which are based on discussed research substance, they are independent variable which includes public open space function (ecology function, architectural/esthetical function, social function) and dependent variable which includes area image ( area identity, area structure, meaning of area). Both variables are analyzed using rationalistic quantitative method which techniques are multiple analysis technique and descriptive analysis. After doing analysis process, the results are: Taman Srigunting and Polder Tawang are successful to conduct each function, but generally, respondents say that Taman Srigunting is much better in doing its function as public open space than Polder Tawang. As for BTPN buiding, public agrees that the building disturbs the image of The area of Old City in Semarang because the design of the building does not adjust the neighborhood and the buildings surrounding it, and also, the condition of the empty building which is not taken care of and used gives more negative effect on the image of The area of Old City in Semarang. Conclusion drawn from this research is the existence of Taman Srigunting and Polder Tawang which have three functions as public open space such as ecology, esthetical, and social function, and the existence of BTPN building affect on the image of The area of Old City in Semarang. Key words : function, open spaces, image

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