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Majalah Forum Teknik UGM
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 12 Documents
 1   2 
Search results for , issue "Vol 27, No 2" : 12 Documents clear
Provenance Study and Tectonic Implications on Rock Sequences in The Lengguru Fold Belt of Western Papua: Constraints from Zircon Fission Track Thermochronology Edy Sutriyono
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The present zircon fission track thermochronologt study reveals Triassic to Pliocene source terrains supplying clastic materials into the present successions in western Papua. The provenance of sedimentary rocks in the region appears to have associated with igneous activities, suggesting an episode of tectonic events in Mesozoic and Cenozoic. Importantly, the Pliocene Buru Formation in the Lengguru Fold Belt contains abundant Paleogene volcanic zircons, which might have been derived from erosion of the Weylond Terrane in the latest Miocene-Pliocene. This suggests the Weyland Terrane was part of the Paleogene 'Caroline Arc, that was eroded after Lute Miocene collision with the western Papua microcontinent. The main compressional pulse in the studied area occurred from -12-4 Ma. The deformation in the mountainous belt in western Papua from 4-0 Ma has been dominated by transpression. This transpressional regime continued in the fold belt, but with less convergence. Meanwhile, compression continued in the frontal part of the Lengguru Fold Belt, creating Pleistocene foldingfeatures such as the Buru Anticline, the Umar Anticline, and the Poronggo Anticline in the eastern Lengguru Fold Belt section. At the present day, transpression is occurring along theTarera'Aiduna Fault with ongoing uplift of the western Papua Fold Belt. However, extension and subsidence are occurring in the Lengguru Fold Belt southeast of Cendrawasih Bay.Keywords : sedimentary rocks, zircon fission, transpression
Unjuk Kerja Reaktor Cuscade Bentuk Kolom Hary Sulistyo; Merry Ad'hadi
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstractSome heterogeneous reactions such as liquid-solid, liquid-liquid were undertaken in the stirred tank batch reactor. To change a batch process into flow process, plugflow resctor is the reactor with the similar performance to the batch reactor. However, it would be faced withproblem to attain the plug flow pattern. A cascade of ideally mixed reactor was reactor which has a similar performance u,ilh the plugflow reactor especiallyfor heterogeneous system.Experinrent was wrdertaken in the column which was divided into three sections. This is similar with the three mixed flow reactors. Sodium chloride was used qs a tracer and water as fluid flow. It was investigated two variables such os stited speed and ratio of impeller diameter to the distance ofthe cascade.In this paper, Bodenstein number of pipe flow reactor and the number of stages for the cascade were determined experinrentally from the residence time distribution of the tluid. It is shown that the results good agreement with the empirical equation proposed by Pawlowski (1962) and Elgeti (1996).
Pengaruh Kecepatan Pendinginan Terhadap Perubahan Volume Leburan Polymer Crystalline dan Non-Crystalline Mohammad Fahrurrozi; Bagus Senowulung dan Moristanto
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

AbstractThe study was directed to develop a method to predict the influence of the rate of cooling to the degree of crystallittitv (DOC) and volume change of crystalline polymers. Crystalline polymer melts exhibit volume shrinkage on cooling below melting point due to crystallization. Crystallization and volunrc shrinkage will proceed with varies rate as long as the temperature is above the glass tansition temperatrre. DOC achieved by polymer is not only determined by the inherent crystallinity of the polymer but also influenced by the rate of cooling. Onfast cooling, inherently crystalline polynrer may have zero DOC. This incompletely crystallized polymer will crystallize and experience volume shrinkages on prolong usage at temperatures above glass transition temperature. A mathematical model and a kinetic model of crystallization based of modification of Avrami equation were solved sintultaneously to give temperature and DOC distributions as ftmctions of time for various rote of cooling. Rate of cooling was varied by changing the water hath ternperalure. Labotatory measurement was done to verifu the predicted temperature profile and average degree of crystallinity. The simulated tenxperature profiles as well as average degree of crystallinities give good agreements with experimental results.Keywords:     polymer, degree of crystallinity, cooling, melting point, crystallization, volume shrinkage, molding
Karakterisasi Aliran HilirKipas Aksial sudu Datar Variasi Span Sudu dan Sudut Serang Joko Waluyo; Sutrisno S
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract The velocity field downnstream of an axial fan was measured using probe 55 P 51 of a Hot Wire Anemometer to investigate characteristic of the flow. Flat blades werevaried in length of blade's span and angle of attock. The length of blade's span was varied at 0.3, 0'5, 0.75 and l times of 450 mm, at various angles of attack at 5º, 10º and I5º, while it was operated at constant speed of 610 rpm. The measurement was conducted at vertical distances 210, 360, 510 and 660 mm from the fan. The investigation was focused on the mean velocity in axial and tangential directions at measurement position 210 mrn. Properties of theflow were computed based on integration of Reynolds momentum and continuity equations for determining flux of axial and angularmomentum. The performance of the axial fan was determined by comparing values of torque, thrust, volume rate and consumed power. The swirling number of the flow was also calculated as a consideration to determine performance of the axial fan. Results indicate that operating the axial fan in variation blade'sspan have significant effect to the value of axial and tangential mean velocities and the area off low, meanwhile variation in angle of attack just influence to the value of axial and tangential mean velocities. Increasing ofblade's span at constant angle of attack If increases volume rate, torque, and thrust of flow and consumed power oJ'the fan. Investigation of increasing angle of attack at span blade 450 mm also increases those values. Span blade 450 mm at angle of attack l5º have a highest performance and consumed power. It can be shown also that swirling increase with respect to increase of angle of attack. Keywords: velocityfield downstream axial flowfan, span's blade,angle of attack.
Characterization of Devcon Plastic Steel Adhesive on Mild Carbon Steel Steel Viktor Malau; H Hadromi
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The objective of this research is to characterize  mechanical  and physical behaviors  of adhesives bonding (butt and tap joints) on mild carbon  steel. The research  used an adhesive material  of devcon  plastic  steel. Mechanical properties  are tensile  sftength,  shear strength  andtoughness  of the joints.The major parameters of this research  were adherends surface roughness  Ra, adhesive thickness, curing  time and curing  temperature. Surface  roughness of the carbon  steel adherends are Ra = 0,52 pm, 0,76 pt and I,2l 1m' Adhesive  thichtess  varyfrom:  0,03 mm to 0,3 mm and curing time: 1, 2, 3, 4 hours at curing temperatures:  55, 70, 85, 100, 120 and 140 oC. The research  has been conducted  under static loads at room temperature'The results of static loads (tensile and shear loads) show that adhesive thiclorcss and odherends  surface roughness influence signifcantly the strength  and toughness  of the joints'An increase  in the adherends  surface roughness  will increase  adhesive  strengths. For certain surface  roughness,  the joints  have an optimunt  adhesive thiclorcss  that produces a strength  and toughness maximum.  Heat lreatntent of the joints at curing temperature for certain  curing  timeinfluences  significanlly  shear stresses. An increase  of curing time will increase  shear stresses' At certain  surface roughness  and curing time (for example:  Ra :  0,76 pn and curing time = 4 hours), this research  shows  that the joints have an optimum  curing temperature. Specimenscured at elevated temperqture  show generally  the increasing  strength, however  there is an optimum  temperature where cure exceed this temperature the strength begins decrease. idhesives bonding failure of butt joints are generally cohesive  and lap joints have a mixed failure cohesive and adhesiveKeywords:  adhesive  bonding, mild carbon steel, devcon plastic steel, static load, butt joints.
Optimasi Kinerja Pompa Sentrifugal Produk Lokal dengan Modifikasi Impeler dan Analisis visualisasi Aliran Soeadgihardo Siswantoro; S Sutrisno
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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A preliminary  efort to  inrprove  an impeller  design for domestic  centrifugal  pump  with  165 mm  outlet  diameter, semi open impeller  has been  initiated  implementing flow visualization method. The  study was focused on  several  impellers  having  different inlet  and  outlet angles, each of  them  has  the  same blade  thickness.A facitity has  been constructed  to  measure  the  performance for those  impellers  at similar speed,  200b  rpm.  The visualization  technique  applied  in  the  study  was  wet paint  method applying  point  on the  surface  of the  impellers  with several  layers  of dffirent  colors  and wetness.Impellers  hwing  optimum  inlet  ond  outlet angles  have been  identified.Keywords :  impeller, flow visualization
Penyusunan Model Konsepsual Basisdata untukSistemlnformasiKadasterMultiguna Rochmad Muryamto
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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The term  of nrultipurpose cadastre is  used to  describe a system  that  is  designed  to  record'store, and  provide  not  only landlenure and land  valuation  idormation  but also a wide varietyof information that  ,o,  u,u f*rtionally related  to  and  referenced  by  property  parcels'  It  meansthat  multipurpose no,t  oniy ,eceiues  information and data from many sources' but it  alsoprovides  services and  products for many purposes and  users'  The  research  is  directed  to  designa  conceptual model  oi mltipuipose  cadastre database  for developing  its  information system'The  conceptual model  was  developed using  entity  relationship diagram  and  represented  inrelational  database  structure. A model  of  multipurpose cadastre,was also  developed  using someparcel  based  data that  came fronr many ,)ur)rr.  The model  was situated  in  KelurahonTahunan,  Yogtakarta'An information system  of multipurpose  cadastre  based  on the conceptual design  can bedeveloped and  it  provided  nol onlyiudicial  andfiscal  information' but  also  semices  informationsuch  as  water,  telephone, and  electricity. In  addition,  some problems  occurred  in  building  themodel were also  discussed'Keywords:  multipurpose  cadastre'  conceptual design
Model Pemilihan Angkutan Sekolah : Studi Kasus Kawasan Kotabaru, Yogyakarta Antonius Haryo I
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

)Alumni  Jurusan Teknik Sipil Fakultas  Teknik  UGMSigit PriyantoJurusan Teknik  Sipil & Magister Sistem dan  Teknik  Transportasi  UGMAbstractWith  it's  title  as  a city of student,  Yogtakarta has  a large  amount  of students which  isaround  105,684  students,  Iiving  in  Yogtakarta  city.  Therefore,  it  was concluded  that  trafic  inYogtakarta  could be much influenced  by students. The  intention  of  this research  is  tounderstand  the  characteristics of students  traveling  with  private  cars, and  if  they  are offeredpublic  transportation  and  they  choose  it.  Therefore  the  congestion  can be reduced.The  stated preference  method  is  applied  to  this  study  to  investigate  the  response  of  privatecar  passengers  to  shift  in  public  transportation  in school  troveling.The  results  showe  that  if  the  public transport  is  available  they  may  be  choose  it  rather  thanprivate cars.Keywords:  public  transport,  private  car,  school  traveling
Karakteristik Arus Lalulintas Sekolah, (Studi Kasus: Kawasan Kota Baru, yogyakarta) Banu Lipantoro
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Alumni  Jurusan  Teknik  Sipil Fakultas  Teknik  UGMSigit PriyantoJurusan Teknik Sipil  & Magister  Sistem dan  Teknik  Transportasi  Fakultas  Teknik  UGMAbstroctThe increase  of demand  in  transportfor  school  octivities  contriibutes  inflow  characteristics.The regulation  of school  entrance  time  begins at the  same  time, which  is  about at  07.00,  causesthe  surrounding  streets  experience  an increased  in trffic flow. Therefore,  the  study  is  toillustrate  the  influence  of schools  activities  in  traffic  characteristics.Observation  were  conducted  on streets  in  Kota  Baru  area,  which is  known  as school-buildings  area.  The  streets  being  observed were Jl.  Cik Ditiro, Jt.  C. Simanjuntak,  JI.  Sudirman,and  Jl. Suroto.  It  was  considered  based  on the  result  on recent  study  that  these  streets  werehighly  inJluenced  by  school activities.Findings from this  research  showed  that  school  activities  had influenced  an  (neragecontribution  to  sunounding  streets  up to  43%.  Further, because  of  such  high contribution,street  experience  a lower  oflevel  ofservice.PendahuluanLalulintas  yang  ada  dewasa ini  membutuhkanperhatian  lebih  mengingat semakin  tingginyabeban  dan tingkat  pengeluaran  untuk  pemecahanpermasalahannya.  Salah  satu  permasalahan  yangmuncul  dan cukup  mengganggu  khususnya  diYogyakarta adalah arus bangkitan  di pagi  hariakibat  aktivitas  sekolah.  Regulasi  pemerintahmengenai  waktu masuk  sekolah  yang  samamengakibatkan  membengkaknya  beban  aliranlalulintas  dijaringan jalan, terutama  jaringan  jalanyang cenderung  menjadi rute  untuk siswa  sekolah.Kemacetan  berkaitan  erat  dengan  volume,kecepatan  dan kepadatan  yang  selanjutnya  padapenelitian  ini  akan  dijadikan  sebagai  parameteruntuk  mengetahui  seberapa  besar  pengaruhaktivitas  sekolah  terhadap  aliran  lalulintas  padaruas  jalan  yang  terpengaruh  langsung.  Arus  jampuncak  yang  terjadi  di Yogyakarra  diidentifikasipada  umumnya  terjadi  pada  waktu-waktu  tertentu,antara lain:  saat  pegawai masuk kantor, saatpelajar  masuk
SIFAT-SIFAT GEOTEKNIK BAHAN TIMBUNAN INTI KEDAP AIR BENDUNGAN BATUTEGI Didiek Djarwadi
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Soil  was  already widely used  as watertight  materials  in  the  embankment  dam engineering, where as,  the  selection  and  treatment  (compaction)  will  in/Iuenced  the  geotechnical  properties.As  a water tight  material the  soil  used should  be  impermeable for controlling  seepage  and  hwe efficient  shear  strength for controlling  stability.The  aim  of  this  research  was to  analyze  the  soil laboratory  test  results  of core  embanlcrnentmaterials obtained  during the  soil investigation  and the  construction  stages  of  the  Batutegi dam,a 125  meter in  height  of earth-rockfill  dam in  Lampung, Indonesia.  The  research  analyzed  thegeotechnical  parameters  and  the  intercelations  of the  geotechnical  parameters  in  order  to indicate  the  geotechnical  properties  of the  core  embankment  materials.  The  evaluation  of the geotechnical  parameters from the soil laboratory  tests  indicated  that  in  term  of density,  permes-bility,  swelling  characteristic, compressibility  as  well as the  strength,  the  core  moterials  used at Batutegi  dam  meets  the  requirement  as watertight  materials  in the  embankment  dam engineering.Keywords:  geotechnical  properties,  embankment  dam,  water tight  materials.

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