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Studi Variabilitas Isotop Airhujan Sebagai Fungsi Elevasi untuk Mendapatkan Merapi Meteoric Water Line MMWL
Full text linkTheoretically environmental isotopic compositions ofprecipitation decrease with increasing altitude. Linear regression analysis was applied to environmental isotopic compositions (δ18O, δ2H) data on 15 precipitation samples collected along an altitudinal 126 to 1260 m.asl from November 2011 to February 2012 to determine the local meteoric water line for southern slope of mount Merapi. Merapi meteoric water line (MMWL) is an equation that describes the relationship between isotopic compositions of precipitation with altitude. This study was completed as part of a larger research of the groundwater dynamics studies using natural isotopes for southern slope of mount Merapi.Isotopic compositions of precipitation samples were measured using Liquid-Water Stable Isotope Analyzer LGR DLT-100 at the Center for the Application of Isotopes & Radiation Technology Laboratory, National Nuclear Energy Agency (BATAN), Jakarta. Regression results for the precipitation samples for southern slope of mount Merapi yielded a MMWL defined by the equation δ2H=8.332 δ18O+15.068(r2 =0,998); the change of isotopic compositions in precipitation with altitude of about -1.2%d100m for deuterium and -0. 1 %dl 00m for oxygen-18.This equation will be useful as reference for hydrological dynamics studies on the southern slope of mount Merapi that use isotopes of 2H and 18O to trace sources of ground-water recharge, to evaluate mixing of sea-water and groundwater, to analyze groundwater-mineral exchange, and to analyze many other groundwater contamination problems.Keywords: precipitation, isotope ratio, isotopic composition, m.asl, MML
Pakarangan di Permukiman Desa Singengu Mandailing Julu, Sumatra Utara
No full textA yard in Singengu Village has a different meaning with a yard in general. Pakarangan or yard in Singengu Village comparises of side area and front area of Bagas (house). It means that the backside area is not a yard. Pakarangan does not has variety vegetation as many house yard, except decorated plant like flower. The objective of this research is to find out pakarangan concept, factors infuenced its concept and what the meaning of pakarangan phenomenon. This research used phenomenological paradigm with naturalistic approach and inductive-qualitative analysis methode. The result of this research are pakarangan comparises of alaman (space in front of bagas), pamispisan (space beside of bagas) and taruma bagas (space underneath of bagas). The backspace of the house is not part of pakarangan but it is a separate space called parik. The concept of pakarangan is based on Mandailing cosmology's belief about Banua Partoru (bottom word). Parik is cnsidered to Banua Portoru, therefore parik is not a part a pakarangan. The meaning of pakarangan is Singengu village is the whole of bagas area except parik.Keywords: Pakarangan, Alaman, Bagas, Parik, Banua Partor
Spektrum Frekuensi Sinyal EEG Terhadap Pergerakan Motorik dan Imajinasi Pergerakan Motorik
Full text linkThis research is aimed to getji-equency spectrum of EEG signals for the motor movement and imagination of motor movement. EEG data is measured from scalp electrode of C3, C4, P3 and P4 (Central and Parietal). The motor movement in this research is "turn right” and "turn left” in which the steering wheels are used to facilitate the volunteer in having concentration. Imagination of motor movement meanwhile represents desire of volunteer to turn steering wheel either to right or to left. Fourier transform is used to transform signals in time domain becoming signals in frequency domain. The result in this research shows the difference of frequency spectrum among motor movement of "turn right" and "turn left" as well as in imagination of motor movement. Keywords: BCI, ERS/ERD, transformasi fourier, motor movemen
Perubahan Hunian Tradisional Suku Dayak Bukit di Kalimantan Selatan (Kajian Perubahan dengan Metode Etnografi)
Full text linkThis paper explains the change of Dayak Bukit's dwelling in the Meratus Mountain in South Kalimantan Province, Indonesia. This research utilized naturalistic paradigm based on the axioms of the nature of reality. By focusing the study on local people, this research employed ethnography met, .od, particularly domain analysis. Interpretation of the domain came into the result that balai-adat is one of the shelters of Dayak Bukit tribes. Currently, Dayak Bukit tribes do not live in a communal dwelling anymore, but live in scuttered housing. Consequently, the function of balai-adat shift from a dwelling into a place of ceremony and cultural activities. It is concluded that balai-adat is an identity of the groups and it corltributes to maintain the existence and the representation of the structure of the Bukit Dayak tribes.Keywords: dwelling change, balai-adat, Dayak Bukit tribes, identity of the groups
Parental Control Model for High School E-Learning
Full text linkAdopting e-Learning in high school is challenging. The main problem in this situation is the adoption of e-Learning as a self-paced learning. In universities, the problem rarely happens since the students in universities have an awareness to explore and to learn by themselves. In high school level, student awareness is limited.High school students more likely need a control mechanism to use e-Learning. In this research, an efort is made to create a model that collaborate parents to control e-Learning usages. The collaboration of parents in e-Learning strongly believed can provides additional value of effectiveness in student e-Learning usage.The result of this research is a model called PCM (Parental Control Model). PCM is an architectural model that contains of information and software architecture that will cover business process collaboration between parent and student.Keywords: e-Learning, parental control model, software architecture, interaction mode
Zoning Regulation as Land Use Control Instrument: Lesson Learned from United States of America and Singapore
Full text linkOne 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 syste
Analisis Pengaruh Proses Brazing Kuningan Terhadap Perubahan Sifat Mekanis dari Pipa Baja Karbon Rendah
Full text linkLow 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 mekani
Rancang Bangun Sistem Pengukur Curah Hujan Jarak-Jauh Real Time Sebagai Peringatan Banjir Lahar Dingin
Full text linkThe 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, modulatio
Pengaruh Sudut Vertikal Terhadap Hasil Ukuran Jarak dan Beda Tinggi Metode Trigonometris Menggunakan Total Station Nikon DTM 352
Full text linkoai:jurnal.ugm.ac.id:article/645The 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
Evaluasi Nilai Noise Sebelum Dan Sesudah Kalibrasi Sebagai Salah Satu Wujud Kinerja Pesawat CT-Scan
Full text linkThe 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