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INDONESIA
Majalah Forum Teknik UGM
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 74 Documents
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Koefisien Perpindahan Massa pada Ekstraksi Aspal Buton dari Kabungka dan Bau-Bau dengan Pelarut n-Heksan Suryo Purwono; Bardi Murachman; Dyah Tri Yulianti; dan Suwati
Forum Teknik Vol 29, No 1 (2005)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Butonion  natural  asphalt  can be used for binder in road construction after its impurities were  removed  by  extraction  using  suitable  solvent.  Researches  on  extraction of Butonion asphalt  have been  done. However, most of them  are  explorative  research.This  experiment  tried  to find mass  transfer  coeficient for Butonion  asphalt  extraction.  The mass tronsfer  coefficient  will be  used  in  extraction  tower  design. In  this  experiment,  multi-stage  cross-cwrent  extraction  was  used  using  n-hexane  as  a solvent.  The number  of  stages was  seven.  Bitumen  obtained  was then  distilled to  separate  the  n-hexane. The operation  variables  were  :  size  of  solid,  rotation  and extTaction  time.The  relationship  of the  mass transfer  coefficient with other variables  can  be written  as:The  constant  values  of  Kabungka  asphalt  are  :  K=6.43558x10tt,  a=0.141569, b=0.2825804,  c =1.76857,  d=  -  1.381755,  e=t.636537x102 ;  those  of Bau-Bau  asphalt  are  : K=  6.3x  I0tt'a  = 0.0891,  b=  0.28258,  c=  L7699,  d = -1.3821Keywords  :  extraction,  mass transfer,  Butonion asphalt
Evaluasi terhadap Waktu Tunggu dan Jarak Berjalan Penumpang pada Perpindahan Moda di Stasiun Lempuyangan Yogyakarta Yuwono Wiarco; Siti Malkhamah
Forum Teknik Vol 29, No 1 (2005)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Lempuyangan Railway  Station is  located  in  Jogjakarta.  To  get  to  or  to  leave  the  station passengers  using  the  railway  services  take  other modes, such  as becak,  buses, taxis, and motorcycles (ojek). The  process of  mode  changing  is  very  importanl.  To  do so,  passengers  have to  walk  to  the  next  mode  stop  and  sometimes they  have to  wait for the  vehicle  arrival.  Research was undertaken  to investigate  the  performance  of  the  mode  changing  process,  in terms  of waiting  time and walking  distance,  based  on  site measurement  and  on what passengers perceived,  to  model the  relationship  between  the  performance  expected  and what  perceived  by the  passengers,  and to  evaluate  the  performance  using  standards set  by Directorate General of Land  Transport.  It  was found that  based  on both direct measurement  and  passengers perception,  the  performance  of  the changing  process  was  good.  There was a very good relationship between  what expected  and  what  perceived  by passengers.  The  waiting  time  and walking  distance  met  the  standards  required.Kata  kunci:  perpindahan  moda,  waktu  tunggu,  jarak  berjalan  kaki.
Pengaruh Kondisi Lapangan terhadap Perancangan Menara Komunikasi Tipe Standar SST E-60 Sumargo Syamsul Basri; Irwan I
Forum Teknik Vol 30, No 3 (2006)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

In the recent years, the communication sector has made a progressive development. The development is not only in the cornmunication technology, but also its supporting equipment. Communication tower is among the supporting equipments as a transmitter which is designed using steel material.At the design stage, companies that design communication tower, have one or few models that hqs been used. Among the communication towers that have been used is communication tower of SST(Self Supporting Tower) E-60 type with 60 m height. The preliminary model is designed with certain field conditions, and came into a question, what will occur if communication tower be built in different field conditions?In this Steady, analysis is conducted to SST E-60, if it can be built in all earthquake zone inIndonesia, can be put in oblique land or with different elevation, how big differential settlement is allowed to happen cmd how many extra antennas can be put on the tower structure. The result shows that commtmication tower of SST E-60 type can be used in all earthquake zone inIndonesia, can be built vith dffirent elevation, has a dffirential ,seltlement ntaxintwn of 2.5 cm, and can he put extra antenna as much as 26 antennas. Keywords: Communicalion tower, SST E-60, self  supporting tower, wilayah gempa (earth zone), tanah miring (oblique land), differential settlement, antena. 
Pengaruh Potongan Harga pada Sistem Inventori (Q,R) yang Mempertimbangkan Ketergantungan antara Lot Size dan Lead Time Nur Indrianti; Setya Prajoko; Trismi Ristyowati
Forum Teknik Vol 30, No 3 (2006)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

This paper is concerned with lot size dependent lead times in a (Q,R) inventory system considering-quantity discounts offered by suppliers. With regards to the existing model that considers the impact of lot size on lead time and safety stock equirements, we present an efficient iterative algorithm to decide lot size that minimizes total inventory cost. The algorithm simultaneously determines lot size and safety stock based on the tradeoff between inventory holding cost and shortage cost. A nurnerical example is provided to clarify the iteration procedure. In addition, we identify the effict of shop floor queing factor on lot size decision.The result of the study shows that purchasing larger lot size does not always result in minimum total inventory cost. Larger lot size reduces per unit ordering cost and shortage cost, but increases the holding cost due to more inventories. Moreover, we conclude that increased shop floor queuing factor leads to increased production lead time, resulting in larger lot size.Keywords: (Q,R) inventory system, lot size dependent lead times, quantity discount.
Analisis Hidraulik Sistem Drainasi di Lahan Gambut Lapangan Minyak Duri Caltex Pacific Indonesia Riau Budi Wignyosukarto
Forum Teknik Vol 28, No 3 (2004)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Duri Field covers an area of approximately 9500 hectars that will be developed with steam injection (steamflooding) into I3 areas. During rainy season, several part of the Duri Field are inundated by rain water that disturbing the operation of the exploration. The problent of inundation in The Duri Field Area that endanger the CPI focilities could be caused by limited canal capacity and bad performance of hydraulic stuctures, change of Rainfall – Runoff relation due to the change of infiltration capacity of the watershed area, land subsidence due to excess load and ground water extraction. Unfurtunately, part of the Duri Field is laid down on the peat soil dome that is subject to land subsidence under an intensive drainage.The important issues in developing a peat lands are land subsidence due to shrinkage and changes to peat properties. Oxidative changes are irreversible. The effort of draining the excess run-off water by increasing the existing canal capacity shall in no way cause for over-draining and lowering the gyound water level during dry season. The drainage system shall be designed to maintain this ground water level to avoid any soil subsidence and drying the peat. An hydraulic simulation to analyze the probable ground waler extraction is performed.The result of conventional hydraulic simulations require a widening and deepening part of the primary canal. This channel improvement will increase the drainability, but in the other side could prontote the lowering of water table, peat oxidation and land subsidence. Instead of channel improvement, increasing the elevation of Duri Field facilities above flood level and developing collector drainage channel along the border of Duri Field are suggested. Keywords: drainage, peat soil, subsidence.
Pengembangan CNC Retrofit Milling untuk Meningkatkan Kemampuan Mesin Milling Manual Dalam Pemesinan Bentuk-bentuk Kompleks Muhammad Kusumawan Herliansyah
Forum Teknik Vol 29, No 1 (2005)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

In small-size mould manufacturing industry, milling process is an important element because this process consumes the longest produclion time. AIso, milling process needs great investments in tools. Most of the small-size mould manufacturing industries uses manual-milling machine for roughing process. Manual milling machine is used because of capacity limitation of the CNC milling machine and high investment of CNC machines.A prototype of low-cost CNC retrofit milling system is developed in this research, to enhance manual milling machine capabilities, in accuracy, speed, and process complexity. The advantage of the prototype results in reduced manufacturing cost and reduced lead time. This research also compare the capabilities of the prototype to others milling systems.The prototype results in accuracy of X axis and Y axis respectively 0.013 mm and 0.009 mm. This system is capable to set the feed rate of minimum 1 mm/min and maximum 250 mm/min, depending on the material being processed.Keywords: prototype, retrofit, CNC milling
Setting Ruang Permukiman dalam Pengembangan Ruang Bermukim Di Kepulauan Togean Sulawesi Tengah Ahda Mulyati; Nindyo Soewarno; Arya Ronald; A Sarwadi
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Togean the islands are cluster of the small islands located in the district of Tojo Una-una and the very excited tourist attraction in Central Sulawesi Province. Some of the cluster of the islands is the settled place Bajo communities who occupied the coastal areas and the small islands. The islands are formed from the volcanic activity with the fertile plants as well surrounded by the rocks formations. Piles of the rocks to forms and functions as a place to living. Togean the islands has an area of ±362,000 ha and has been designated as one of the Marine National Park in the Indonesia. Case study research approah used with multiple cases, naturalistic quantitative data collection with analysis techniques in exploration.The islands in the islands Togean as a shelter the coastal communities particularly in the settlements on the islands of Enam/Enau (district Togean) and the island Kabalutan (district Walea the island). The two these islands setting show a very specifically lived spaces because it is strongly influenced by of nature physical factors, socio-economic conditions, and the local wisdom there. The development of the settlement spaces setting formal due to : (a) the limited land areas as a dwelling allocation, (b) presense of land potential that can be developed to support the economic life and the preservation of natural environment, and (c) the environmental suistainability of its settlement that a unique and specific. Keywords : Setting Space, Housing, Development Settlement
Rekayasa Matarial Akustik Ruang Dalam Desain Bangunan : Studi Kasus Rumah Tinggal Sekitar Bandara Adisutjipto Yogyakarta K Kaharuddin; Arif Kusumawanto
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

This research was conducted to determine the conditions and manipulate the acoustic material by the mathematical experiment method the calculations was using a specific formula replacing the value of material acoustic sound coefficient. The focus of this research was analyzing the sound absorption and noise reductions of acoustic materials used in residential arround Adisutjipto airport of Yogyakarta then proceed with the analysis of sound absorption and noise reduction of coconut palm fiber designed acoustic materials based on buiding physical theory.The results show that the low sound absorption and noise reduction of the acoustic material inside the sample chamber was due to the material used had a sound reflector characteristic, so optimize the noise reduction it was needed an additional layer of acoustic material used in the fields. The high sound absorption and noise reduction of the coconut palm fiber desgned materials caused by these materials had sound-absorbing properties. The addition of coconut palm fiber layer for acoustic material could optimize the noise reduction. In addition, the coconut palm fiber acoustic material could be used as an altenative sound dampening material at high frequencies that could potentially reduce the waste of nature. Keywords : Residential, accustics materials, coconut fiber, mathematical experiment.
Peraturan Zonasi: Peran Dalam Pemanfaatan Ruang dan Pembangunan Kembali di Kawasan Rawan Bencana Kasus: Arkadelphia City, Arkansas USA K Korlena; Achmad Djunaedi; Leksono Probosubanu; Nurhasan Ismail
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Earthquake, tsunami and volcanic eruption are some of the various disasters that frequently hit in Indonesia. These disasters impact damage from small to large. These disasters also have a major impact on the balance of community lifes who are victims. Various efforts of reconstruction, rehabilitation and reconstruction are undertaken by governments, communities and various stakeholders. To succeed as expected, these efforts should be based an a spatial plan which is suitable and comprehensive. The spatial planning in disaster prone areas is indispensable in dealing with disasters before, during and after a disaster. Formulation and implementation of spatial plans are turned to face many problems such as limited and the loss of data due to disasters, as well as social and cultural conditions in disaster prone areas. To streamline the implementation of spatial plans and land use control need zoning regulation as a land use control instrument. Therefore, it is necessary to study the role of zoning regulation in the utilization of space and rebuilding in disaster areas prone.This study used a descriptive approach with literature sources. The results show that: (1) The Making of spatial plan on the basis of disaster mitigation in disaster prone areas is indispensable in dealing with disasters, before, during and after a disaster and should be complemented with zoning regulations, (2) The making of spatial plan and zoning regulations in the region after the disaster requires a special approach by modifying the normal procedure, and (3) zoning regulation as a land use control instrument control instrument guides the implementation of various activities related to disaster mitigation and need to be adjusted to the social, economic, cultural and characteristics of each disaster prone areas.Keywords : spatial plan, zoning regulation, disaster prone areas, disaster mitigation.
Dinamika Pemanfaatan Lahan Kampung Bersejarah 'Luar Batang' - Jakarta Utara Popi Puspitasari; Achmad Djunaedi; Bakti Setiawan; Sudaryono S
Forum Teknik Vol 34, No 1 (2011)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The dynamic of land utilization is related to changes of land function. In this contect, the morphological study is impemented to uncover the changes in land functions in Kampung Luar Batang, Nort Jakarta, Indonesia. Kampung Luar Batang is a historical Kampung which was estabished by VOC in Batavia under the influence of existence of a Moslem missionary, Al-Habib Husein bin Abubakar Allaydrus, and accelerated by the its strategic geographical location close to urban economic centers, Historically, Luar Batang has been a place for laborers' settlement, VOC defense port, port of transit for migrants, pilgrimage center and rental dwelling that is surrounded by illegal housing. Each function was not chronologically appeared, but developed in multi-layered manner.In fact the historical meanings of Luar Batang were not obtained through in depth literature study, since the availability of references about the kampung is very limited. This study is an effort to uncover the physical elements of the kampung from historical perspective, based on the maps documentatin and empirical study. The graphical abstraction model presented at this paper is an attempt to clarify the dynamic of land utilization.Keywords : Morphology, Kampung bersejarah, Luar Batang.

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