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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 8 Documents

Search results for , issue "vol 30, no 3 (2009)" : 8 Documents clear

PERHITUNGAN POTENSI BAHAN TAMBANG SIRTU DI WILAYAH SUNGAI DI KABUPATEN PEKALONGAN Najib Najib
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

Pekalongan Residence has a relatively many sand and gravel deposits particularly in river area. Nowadays,many locations have been exploited by local residences or investors from other regions. Even though theexploitation has running, up to now the local government doesn’t know yet how many reserve indicationmaterial deposits in that area. As the result of that condition, it is called for the research to determine thepotential of mining resources in river area. The factors estimate the mining potential based on geologicconditions such as elevation and deposit types. This research use grid and trapezium method. Based onlaboratories tests showed that the dominant materials in that area is up to sand size(around 87 – 98%). Thepotential of deposits is divided into three i.e. river part, levee part and land part. The total of potential in eachdistrict are Kesesi (515.625 m3), Kajen (78.295m3), Karanganyar (1.938.751m3), Wonopringgo( 1.334.375 m3),Doro( 1.984.375 m3), Talun( 1.355.625 m3), Karangdadap( 140.150 m3) and Kedungwuni( 130.000 m3).

STUDY ON SURGE ARRESTER PERFORMANCE DUE TO LIGHTNING STROKE IN 20 KV DISTRIBUTION LINES Agung Warsito; Abdul Syakur; Liliyana N.S.
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

Electric energy has been transmiting from power station to end user with transmission and distribution lines.Lightning strokes are problems that occure in transmission and distribution lines and make them fault when theelectric energy were transmited. Surge Diverter or Lightning Arrester has been installing to reduce these faults.In this paper the simulation of lightning stroke and lightning arrester performance on distribution lines 20 kVwere done using EMTP (Electromagnetic Transient Program). Some parameters such us impuls voltage andincreasing voltage on distribution line was inverstigated. As case study in this simulation, Mojosongo 1 mainfeeder 20 kV three phase lines were used.The simulation results show that the lightning stroke 20 kA in By1-61-61E-84-9I on S phase at 0,1 ms, makevoltage on S phase was increased about 1,3054 MV. For R phase and T phase will increase of induced voltagewere 0.79539 MV and 0.80484 MV. We also show the performance of MOV Arrester (Metal Oxide Varistor) inovercoming lightning stroke trouble, where arrester can decrease voltage up to 15.198 kV on S phase, while atR phase and T phase arrester can decrease voltage up to 11.375 kV and 13.616 kV.

ANALISA TEKNIS DAN EKONOMIS PENGGUNAAN COREMAT UNTUK KONSTRUKSI FRP (FIBERGLASS REINFORCED PLASTIC) SANDWICH PADA BADAN KAPAL Parlindungan Manik; Eko Sasmito Hadi
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

Planning of ship construction is make its having good effectivity value and efficiency. Composite as materialalternative to changes of steel feedstock and wood has many applied named FRP (fiberglass reinforcedplastics) single skin. The weakness of this FRP was heavy construction and requires many production time.Therefore, will be checked comparison between single skin with sandwich constructions for shell.In this research, the way for making composite is hand lay up method with three various thickness of skinthere are : t, t/2, and t/4. To know strength comparison from the various skin of sandwich with single skin,must be test, consist of tensile test.. The result is analyzed then compared by BKI (Biro Klasifikasi Indonesia)rules for the fiberglass ship.Based on the result, indicates that optimization skin thickness of sandwich construction applies Corematwhich tensile strength it is equivalent with Single Skin at 2/3t and usage of Sandwich construction causes23,12 % lighter. In economic analyze, advantage from low weight is compensation of addition 23,12 % DWT.Material cost for Sandwich about 11,35% bigger than Single Skin construction.

ANALISIS POTENSI PENERAPAN KERJASAMA PEMERINTAH SWASTA (KPS) DALAM PENGEMBANGAN INFRASTRUKTUR TRANSPORTASI DI PERKOTAAN (Studi Kasus Kota Semarang) Eri Setianto Kurniawan; Bambang Pudjianto; Y.I. Wicaksono
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

The role of Local Government (Province and District / City) become very important in creating atransportation infrastructure that can support a regional transportation activities and implementing thePublic Private Partnership (PPP) model as an alternative financing strategies other than APBN / APBD.The purpose and goal of this research is to conduct a comprehensive study in order to obtain a picture of thepotential level of urban transport infrastructure development (case study of Semarang City) who performedwith the Public Private Partnership (PPP) model, viewed from the perspective of related stakesholder.Research methodology using descriptive statistical approach and SWOT analysis with the matrix space model.The research concluded that the potential application of PPP policies in the development of transportationinfrastructure in the city of Semarang is located at the conservative level, which means that although there area number of external strategic factors which potentially threat to the implementation of the PPP policies,there is still a commissioner of the strength of internal factors that can be optimized.

KARAKTERISTIK AKTIVITAS PEDAGANG KAKI LIMA PADA KAWASAN KOMERSIAL DI PUSAT KOTA Studi Kasus: Simpang Lima, Semarang Retno Widjajanti
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

The characteristic of street vendors in Simpang Lima should be recognized. It is connected with spatial region’sactivity so that both of the formal and informal activities can exists harmonically. The characteristics of thestreet food vendors activity are follows: the activity space (street vendor’s trading location is at the mall/office/school/mosque/ in Pancasila square and they are selling in the sidewalk at the edge of the Pancasila square);their distribution pattern is agglomeration; they are more settle; their activities (type of food/beverage,accessories, clothing, grocery, cigarettes, and their facilities are tent, wagon, carpet, table/rack; the time ofstreet vendors trading is following the formal activities of the region; goals and motivations of visitor’s vendorsis that most of them are visiting street vendors, and the motivational visits are to buy food/drinks and othertypes of merchandise).

PENGAMBILAN OLEORESIN DARI AMPAS JAHE (HASIL SAMPING PENYULINGAN MINYAK JAHE) DENGAN PROSES EKSTRAKSI Faleh Setia Budi
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

During this time the ginger oil distillation waste are only used as fire wood for the distillation process. It ispredicted that this waste still contain oleoresin. Oleoresin is the mixture fixed oil (3 – 4 %), essential oil (1 – 3%), resin etc. This research aims to find the most affecting variable and the optimum operation condition inthe extraction processing oleoresin from ginger oil distillation waste. The research is planned to use thefactorial design method 2 levels and 3 independent variables i.e.: temperature (30-60 oC), time (2-6 hours)and solvent volume (300/150- 700/150) ml/gr the weight of ginger waste. The experiment quantities whichmust be carried out are 8 runs. The observed parameters are weight, density and refraction index. The threeindependent variables give positive effect/ increase the product and time is the most influential variables. Thenthe optimization process is carried out to get the optimum operation condition by varying the extraction time.The optimum operation condition of oleoresin extraction is 5.5 hours, temperature 60 oC and solvent volume700ml/150 gr the weight of ginger waste. The number of oleoresin which can be obtained volume 4.1 ml,weight oleoresin 2.7 grams, density 0.67 grams/ml, and refraction index 1.4744. GCMS analysis shows thatthe zingeberence content is 14.91%.

PENGARUH PENGGUNAAN SERAT KULIT ROTAN SEBAGAI PENGUAT PADA KOMPOSIT POLIMER DENGAN MATRIKS POLYESTER YUKALAC 157 TERHADAP KEKUATAN TARIK DAN DAN TEKUK Sarjito Jokosisworo
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

This time, rattan bark fiber’s used in furniture industries and home industries because it is easy to get, cheap,not to be danger for our health, and it can lesson environment pollution (biodegradability); so, with exploit ascomposites lasing fibre, later, it can overcome the environment problem. The rattan bark development ascomposite material has already know, in view of the raw material of natural fibre (rattan) available, Indonesiahas many raw material. From this case, this research conducted to get technical analysis of tensile strength andbending from rattan bark fibre composite that is using woven roving treatment of variation matting pattern onfibre direction 0º/90º and 45º angles as polyester resin matrix.The purpose of this research is: to identify the tensile strength and bending of composite of rattan bark fibrewhich influence fibre direction between 0º/90º and 45º angles. From the result of specimen trial is served intensile strength and bending, and compared with tensile strength and bending value which permitted by BKI (Biro Klasifikasi Indonesia) as theory of standardization trial. On the research, the writer found composite thathave rattan bark fibre compared 0º/90º and 45º angle of fibre direction, the treatment of matting pattern fibre,volume fraction 42,8% matrix polyester and 57,2% rattan bark fibre to specimen of tensile strength trial,volume fraction 50% matrix polyester and 50% rattan bark fibre to specimen bending trials. Conducted handlay up method, from the result study found the price maximum of tensile strength has got by composite with0º/90º and 45º fibre direction and maximum bending has got by composite with 45º fibre direction.

THE OUTBURST OF MODERN MARKET DEVELOPMENT (HYPERMART, MALL AND THE KINDS) Murni Ediati
TEKNIK Vol 30, No 3 (2009)
Publisher : Diponegoro University

Urban areas in Indonesia have tended to grow with little control or order in recent years, and this problemincludes the problem of modern markets. The emergence of modern market centers in Indonesia has given anew color to commerce activities. Opinions pro and contra have appeared about the emergence of thesecommercial centers. There are the various interests and needs of the actors such as investors, society, andgovernment in the emergence of malls, plazas, hypermarts, and groceries. The interests focus on the need toimprove tax revenue, regional compensation, inclusion of employees, improvement of trade, and the fulfillmentof people living standbards. Recently, the fast-growing modern markets have caused many controversies.However, government policies and decisions still support the emergence of such modern trade centers. Thesemodern markets compete with traditional markets. Although the traditional markets have their own marketsegments, modern markets should not allowed to wipe out them out. Based on these reasons, therefore, thegovernment should make strict, fair, and neutral regional policies (regional regulation) such as zoning rule andurban planning concepts for upcoming 50 years. Moreover, the government should improve the role oforganizers and urban planners as the managers, and enrich the market with pluralistic and comprehensiveconcepts sustainable development and social participation, something which is often neglected in urbanplanning.

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