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INDONESIA
Majalah Forum Teknik UGM
Published by Universitas Gadjah Mada
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 33, No 3 (2010)" : 8 Documents clear
Nilai Kosmologi pada Tata Spasial Permukiman Desa Kapencar, Lereng Gunung Sindoro, Wonosobo VG Sri Rejeki; Nindyo Soewarno; Sudaryono Sudaryono; T. Yoyok Wahyu Subroto
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The Kapencar Village, as one of villages on the slope of Sumbing Mountain, hascosmological concept of spatial setting. The phenomenological research, was done by theresearcher as own instrument, explored for finding the spatial cosmological value in theKapencar villages. Some results of the research are:1) The Kapencar Village as the Glondongvilage, expresed the mon-copat concept, with the Kapencar village as the centre. 2) keblatwetan as a cosmological concept. Wetan orientation as a symbol of the start of living or thevery previous time of people living. Two cosmological concepts of spatial setting expresed theKapencar Village has the grand cosmologycal concept in people lining, there is keblat papatkalimo pancer (four orientations and the centre as the fifth oerintation).Kata kunci : Cosmology; the slope of the mountain settlement; spatial setting
Pengaruh Sudut Vertikal Terhadap Hasil Ukuran Jarak dan Beda Tinggi Metode Trigonometris Menggunakan Total Station Nikon DTM 352 Parseno Parseno; Yulaikhah Yulaikhah
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The measurement of heigh differences using trigonometric technique, and Total Station NikonDTM 352 is used.It is identified that the use of different vertical angle will produce differentheights for the same point. It is interesting to analyse further that, the errors of distance andheight differences in trigonometric technique are as the function of vertical angle. This researchtries to investigate the phenomenom mentioned above: is there sistimatical error? and how tocorect them ?This research is initially arranged to include some steps: (1) preparation of instruments, (2)measurement of distance and height differences in study area using spirit levelling andtrigonometric levelling, (3) Data processing including correction of differences in heightmodelling. Evaluation was carried out by comparing both data of observed height differences.Based on the result of the statistical test, it is found that the variety of vertical angles do notaffect the computed distance and height differences using Total Station. From the data exercisesresulted that the accuracy of height differences is affected by distance and vertical angle,however for the distance up to 800 m, the improvement is not signifcant. In addition the fieldobservations also show that the distance greater than 50m , the contribution of the accuracy ofangle to the change of the accuracy of height differences is greater than the contribution of theaccuracy of the distances.Keywords: height differences,trigonometric levelling, trigonometric technique, Total Station.
Zoning Regulation as Land Use Control Instrument: Lesson Learned from United States of America and Singapore Korlena Korlena; Achmad Djunaedi; Leksono Probosubanu; Nurhasan Ismail
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

One of local government authorities is the implementation of land use planning. Due to implementation land use planning, controlling is needed as effort for the implementation is appropriate with the planning. According to Spatial Planning Act No.26/2007, land use control instruments are zoning regulation, permit, incentive and disincentive, and sanction. In Indonesia, zoning regulation is new instrument and only a few of city that have made and uses zoning regulation as land use control instrument. Local government has to create zoning regulation and uses it to control land use in their area. Comparative study is needed to learn from other countries that use zoning regulation as land use control instrument successful.United State of America and Singapore are relevant as cases study because of their success in using of zoning regulation. This study used a descriptive approach with literature sources. The results show that: (1) there is similarity between United State of America (USA) and Singapore in success using zoning regulation as instrument of land use control; (2) There is different type of land use control system. Most of cities in USA, except Houston City, use regulatory system. Inthis system, decision for a land use application is only based on zoning regulation. While Singapore uses discretionary system, the owner’s right to develop is controlled, not only by a zoning regulation, but also by a planning authority’s discretion. Keywords: zoning regulation, land use control, regulatory system, discretionary system
Evaluasi Nilai Noise Sebelum Dan Sesudah Kalibrasi Sebagai Salah Satu Wujud Kinerja Pesawat CT-Scan Andrey Nino Kurniawan Nino Kurniawan; Indah Soesanti Soesanti
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The noise has to be measured daily because it directly degrades image quality, which inturn it is dificult to define between normal and pathological tissues on a-CT image. Thisresearch’s aim was performed to examine noise differences between before and aftercalibrating of the CT-scanner system, and also to study the chance of noise deviated values day-by-day during 20 days of the two different periods of measurement.A callibrated head water phantom was scanned before and after equipment callibrations,using the head scanning parameter, and device measurement at ROI 228.2 mm2 to obtain thenoise data. Descriptive statistics was employed to present related information, and the T-testpaired-sample was the statistical tool to test the null hypothese (Ho) with level of significance(α) 0.05.The results showed most of noise values between before and after equipment calibrationsfall arround the base line or within two standard deviation (2SD). In before callibration of thenoise, the base line noise value is 4.76 HU whereas the upper limit and the lower limmit of thenoise values are 5.34 HU and 4.18 HU (respectively) with a-1.16 HU difference. In aftercallibration of the noise, the base line noise value is 4.35 HU whereas the upper limit and thelower limmit of the noise values are 5.29 HU and 3.41 HU with a-1.87 HU difference. However,there are two out of fourty noise values (± 5%) that fall outside of the 2SD limmit if a numberfalls outside of 2SD from the base line in the same direction (i.e., all high or all low) more thanfour days in a row, it is a shift that could be due to a machine malfunction and should beinvestigated before the outer control limit is exceeded. Statistical analyses with paired- sampleT-test showed p-value (0.005) < 0.05. By this meaning that, the noise between before and afterCT-Scanner callibrations are different in their values additonally most of the noise values aftercallibration seem to be low compared with that of the values before callibrations.Keywords: CT scan, evaluation, noise.
Pengaruh Parameter Number Of Excitation (NEX) Terhadap SNR Dwi Rochmayanti; Thomas Sri Widodo; Indah Soesanti
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

This research aims to observe the influence of Number of Excitation (NEX) to bothparameters the Signal to Noise Ratio (SNR) and the scanning time when performing the MRneck . Some MR scan parameters (TR, TE, FOV, slice thickness, matrix, flip angle andbandwidth) are strictly under controlled. All SNR data, due to the 6 NEX variations (NEX 1 toNEX 6), are required by comparing the ROI’s intensity between the noise background and theareas of corpus and spinal cord on the images. The scan times are also recorded for each of theNEX variations being observed. In conclusion, increasing NEX values will simultaneously risethe SNR and the scanning time.Keywords : NEX, SNR, Image MRI, Scan time
Rancang Bangun Sistem Pengukur Curah Hujan Jarak-Jauh Real Time Sebagai Peringatan Banjir Lahar Dingin Sunarno Sunarno
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

The aim of this research is to set up a sufficient system, which is used for real-time raingauge telemonitoring as the early warning system for cold lava avalanche of Mount Merapi.The system contains a remote station (transducer, Counter Timer, CPM Frequency Converter,FSK Modulator, and Tx/Rx) and a controller station (Tx/Rx, FSK demodulator, and personalcomputer).Data managements which are developed in this research are expected to be used in a realtime a rain gauge telemonitoring of Mount Merapi. The characteristics of data communicationin this system are unguided type with air as the media, asynchronous serial mode, simplex modetransmission, with audio modulation and frequency shift keying modulation. A pair of handy-transceiver was use in data transmitting with VHF/UHF wave at Amateur Radio DataFrequency (144,100 MHz and 431,125 MHz). Rainfall data changes 60 ml in 10 seconds wassent with the variation of sound frequency, started at 645 Hz with delay time 0.0168 seconds upto 2.993 Hz with delay time 0,0015 seconds.This research is expected to give valuable information for the telemonitoring systemengineering development, especially for engineers who work in the field of telemonitoringsystem and for the people who live in the Mount Merapi surroundingKeywords: telemonitoring, rain gauge, FSK, modulation
Analisis Pengaruh Proses Brazing Kuningan Terhadap Perubahan Sifat Mekanis dari Pipa Baja Karbon Rendah Mardiana Mardiana; Djoko W. Karmiadji
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

Low carbon steel has suitable physical properties such as: easily to be casted, welded andmachined. Generally, this steel is used for construction, hospital and house hold equipment, andso on. Some equipment structures employ low carbon steel pipe for basic construction, in whicha lot of brazing joins are applied for connecting each pipe to form a house hold or hospitalequipment. This research analyzes the brazing methode, since it is commonly used to obtainsmoother joint surface compared with the other method and having lower melting temperaturethan the pipe. The analysis emphasizes the transformation of mechanical characteristics suchas: tensile strength, hardness, micro and macro structures. The result of this research showsthat the maximum tensile strength is 509 N/mm2 when the welded groove is 0,5 mm, or 2,35%greater than welded metal strength, and 12,5% less than base metal strength. The hardnessvalues are decreasing compared with the base metal, i.e., 18,5% of average, 18,57% at HAZ(Heat Afffected Zone), and 19,81% of pipe metal under the value of base metal.Kata kunci: Brazing, pipa baja karbon rendah, sifat mekanis
Karakteristik Menara Pendingin dengan Bahan Isian Ijuk Susanto Johanes
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

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Abstract

In this study the characteristic of a water cooling tower by using the palm fibre as thepacking material have been investigated experimentally. The experiments were carried out in arectangle glass tower of 81 cm2 cross sectional area and 100 cm height. The packing used wasconstructed of 8 palm-fibre ropes (of about 0,6 cm diameter), zigzag vertically placed above thestainless steel support on the tower bottom. Its type has 28,3.10-4 kg weighs of rope every m3volume of the packing.The experimental results show that the increasing of the water inlet temperature and thepacking height cause the increasing of the tower characteristic. Mean while, the increasing ofthe water/air mass flow rate ratio causes the decreasing of the tower characteristic. The towercharacteristic is as a function of the investigated variables which expressed as:NTU = 3,35.10-3 (m w /m a )-0,995 (Z)0,5050 (T wi )1,1643with the relative error of 5,5%.This equation is valid for the range of variables, as m w /m a which is ranged from 4,46 to9,48, Z which is ranged from 30 to 90 cm, T wi which is ranged from 50 to 60 oC. The meaneffectiveness of the heat transfer were calculated to be 25,9%.Keywords: Cooling tower, characteristic, effectiveness, palm-fibre ropes.

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