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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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Aplikasi Packet Diffusion Model untuk Menganalisis Pengaruh Fenomena Micromixing terhadap Jalannya Reaksi Kimia Paralel di dalam Reaktor Tangki reraduk Kontinyu dengan Aliran Umpan Terpisah Ali Altway; Sugeng Winardi; M Rachimoellah
Forum Teknik Vol 28, No 2 (2004)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The effect of turbulent  mixing on  the  course  of two fast parallel competitive  chemical reactions  (netralization  of sodium  biborate  snd  iodide-iodate  oxidation-reduction  reactions) carried  out  in  continuous  stiwed  tank  reaktors  have been  studied  theoretically,  using  PacketDiffusion  Model,  and  experimentally  to  validate  the  theoretical predictions.System studied  consists  of flat bottom  cylindrical  tank  0.2 m in  diameter.  The height of liquid  in  the  tank  is  also  0.2 m. The  tank  was equipped  with Fan Turbine  with diameter equal  to I/3  tank  diameter. Sulphuric  acid solution  (0.5  Il,Q was fed into  the  tank through  2 mm-diameter pipe,  and  the  aquous  solution containing 0.0909  M NaH2Boj,  0.0909  M H:Bo:,  0.0116667  M KI, and  0.0023333  M KIO3wasfed  into  the  tank  through  I0  mm-diameter  pipe.  The rate  of acid solution  was  varied  0,045,  0.068,  and 0.09  liter/minute,  while the  rate  of  the  other solution  was varied  I,  1.5,  and  2 liter/minute  (the  rate  variation  coruespond  to  the  mean residence  time variation of 6, 4, and 3 minutes). The  impeller  rotation  speedwas  varied;  9,12,  and  I5  rps.  The iodine  concenftation  in  the  tank  influent  was  analyzed  using  spectrophotometer.The  simulation  works  conclude  that  the  selectivity  of iodine  decrease  with  increasing impeller  rototion  speed for the  mean  residence  time of 3 and 4 minutes,  while for the  mean residence  time of  6 minutes,  the iodine  selectivity increase  with  increasing  impeller  rotation speed. Increasing  the  mean residence  time from 3 to  4 minutes will decrease  the  iodine selectivity, while  increasing  the  mean residence  time further to  6 minutes  will  increase  the selectivity.  The theoretical  prediction  using  Packet  Difusion  Model agree fairly well  with  the experimental data.  The  experimental studies  also  showed  that  the feed position  in  the  region  of high  turbulent  intensity  (impeller  region)  give  lower iodine  selectivity compaired  to  the selectivity  in  the  region  of lower  turbulent  intensity.  The  Packet  Dffision  Model  cannot simulate  the  effect  offeed  position  on the  iodine  selectivity.Keywords:  Packet  Diffusion Model, Micromixing, and  Continuous  Stirred  Tank  Reactor
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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Abstract

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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Abstract

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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Abstract

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.
Pengamanan Tebing Pantai Tanjung Playu Batam Nur Yuwono; Muhammad Effendi Saputra; Y Yuwono
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Tanjung  Playu  Beach, Batam  Island,  is  a wonderfull fishermen village.  The  housing  and public facilities are  built  a long  the  coast.  These  buildings and facilities are subject  to wave attack,  especially  during wave season  and  high tides.  In  order  to  combat  this  problem,  a special research  is  carried  out.This research  is  intended  to analyze the  problem  and  to find out  the solution  through  the  hydraulic  model  test.  Based  on this  research,  the  design  of sea wall is carried  out in  order  to  gct  a building which  environmentalyfriendly.Keywords:  wave attack,  hydraulic  model  test,  sea  wall.
Pengembangan Auto CAD dengan vB untuk Desain Pola Coran dan Cetakan Produk Pulley Standar Tipe Taper Lock Muhammad Kusumawan Herliansyah
Forum Teknik Vol 28, No 2 (2004)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

dan  Adi NugrohoJl.  Grafika  No.  2,  Kampus  UGM,  Yogtakarta  55281AbstractThis paper  presents the  development  of  automatic casting  design  system for Taperlockpulley  type.  This  system  is  intended  to  assist  casting  designer  in  pattern design,  to  reduce  designtime,  and  to  minimize error  in  transfering  product  design  data into  pattern  design.The input  of this  system  is  data  base  of taper  lock  pulley's  catalogue  in  mdb format, whilethe  output  is  design of the  pattern  drawing  in  2D and  3D  solid. Moreover to  generate  patterndesign  is  around  59 second.Keywords:  casting,  pattern,  automat  ic.l.
Pengaruh Pengoperasian Reaktor Kartini terhadapKadar DO, BOD, dan COD Air Pendingin primer Agus Budhie Wijatna
Forum Teknik Vol 28, No 2 (2004)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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 Affiliation—Country—Bio Statement Principal contact for editorial correspondence. NameTri Wulan Tjiptono Affiliation—Country—Bio StatementPusat Penelitian dan  Pengembangan  Teknologi  Maju  -  BATAN, Yogyakarta NameTony Dwi Susanto Affiliation—Country—Bio StatementFakultas Teknik Industri,  UPN Veteran, YogyakartaTitle and AbstractTitle  AbstractIn  light  water  reaclor  (LWR) systems,  water coolant passes through  reactor  core  to  remove heat  generated  by fission processes.  Therefore,  the  temperature  of water  coolant raise  and thewater  coolant  is  irradialed  by neutrons from reactor core.The research was  directed  to  explorethe influences  of  both of them  to  the  contents of Dissolved  Oxygen  (DO), Biological OrygenDentand  (BOD)  and  Chemical  Oxygen Demand  (COD).The  research  wss done by  chemical titration method  to  measure  the  content  of DO,  BOD5,and COD in the  water  coolant  in  which  the reactor  was  operated  at   critical  condition  andconstant  power.  water  samplingwere   done  after  45',90',  l3s',  IB0',225',  and  270',   reactoroperation.The results  of  this  research  are:  (1)  the  temperature  of the  coolant  is  increasing  asoperating  time function, (2) the content  of DO is  also  increasing,  while  BOD5 and  COD tends  tobe constant,  and  (3)in  general  the reactor  water coolant  is  safe  to  be released  to the environment.Keywords:  water coolant,  heat,  irradiation, chemical titration, DO
Pemanfaatan Sistem Informasi Geografik untuk Penentuan Bank Tempat Pembayaran Pajak Bumi dan Bangunan Pelaksana Payment Online System S Sardana; Rochmad Muryamto
Forum Teknik Vol 27, No 2&3 (2003)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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The research  aims to  do the  spatial  analysis  in selecting  banks for paying  land  and  building tax  (Tp  banps)  which will  be  nominated  as  POS  banlrs  (Payment  Online System)  banks  in Bandung  city  by applying  GIS (Geographic Information  Systems)  technology.GIS spafial  analysis  was  conducted  using  three  coverages;  administrative  boundaries  of Bandung city,  land  use,  and  distibution  of  TP banlcs,  including  their  corresponding attribute data.  verything  technique  and  overlay  operations  using  Arc/Info GIS  software  were  conducted to  select  the  priority of TP banks based  on  some  determined  criteria.Nineteen  Tp banks were  nominated  as POS,  eight of them  were  considered  as the  major priority  where  their  locations  are equally distributed  in Bandung  city.Keywords:  tax,  geographic  information  systems,  spatial  analysis     

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