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Pengembangan Metode Pembuatan Molding Injeksi Plastik dari Serbuk Komposit
No full textAluminium-particulate glass matrices composites generally use the pressure in the making of green parts/green specimens before heating at sintering temperature.The purpose of this research is to develop the glass composites that it can be used as a material for indirect layer manufacturing, especially used for making plastic injection mold/insert mold. To achieve these goals, the flexural strength and dimensional errors were studied.Starting materials consist of the mixture of glass powders, aluminium powders, and acrylic powders in the volume ratio of 1 : 1 : 1. The glass powders and aluminium powders wererecovered from waste materials. The size of acrylics and glass particles was lower than 0.074 mm and aluminium particles size was lower than 0.297 mm respectively. Green specimens were made by using indirect layer manufacturing processes, while sintered specimens obtained by heating the green specimens in a furnace at a temperature of 700°C for 1 hour. Finished specimens were made by impregnation process of sintered specimens using epoxy resin.The bending strength of green specimens, sintered specimens, and finished specimens is 20 kg/cm2, 80 kg/cm2, and 170 kg/cm2 respectively. Maximum dimensional error of green specimens and sintered specimens is 50% and 40% respectively. Insert mold made by indirect layer manufacturing is broken after producing as many as 120 pieces of plastic products.Keywords: glass matrix composite, insert mold, dimensional error, bending strength
Rancang Bangun Kontruksi TEG (Thermoelectric Generator) pada Knalpot Sepeda Motor untuk Pembangkitan Listrik Mandiri
No full text The utilization of waste heat from exhaust gas in motorcycle is a typical application of electricity generation using thermoelectric generator (TEG) technology. The construction of TEG that mounted at outer surface of motorcycle exhaust pipe will depend on quality of threemain components: the support structure, the thermoelectric module, and the heat dissipation system. The components will influence heat conversion to electricity so those are must be well designed to required heat transfer process from the surface of exhaust pipe to hot side and cold side of TEG. The methods that used are designing good construction of TEG with Aluminum material that will to be installed properly on surface of motorcycle exhaust pipe without disturbing theheat transfer from the surface to the both side of TEG. This design allows the TEG can be assembled easily without damaging the TEG module itself too. Then before testing onmotorcycle, the construction design run testing by the heat transfer software to observe how much heat that generate from the surface and transferred to the both side of the TEG. TEG module used is the HZ-14 which has dimensions of 6.25 cm x 6.25 cm and the selected motorcycle is a 150 cc motorcycle sport type. The result of TEG construction consists of two main parts, the holder of TEG modules for HZ -14 and a heat sink that adapted to the shape of exhaust pipe motorcycle. The heat sink is also related to the cold sink is made from aluminum fins placed on the cold side of the TEG. The test results generated electrical voltage output indicates that the voltage will begin to be raised shortly after the motorcycle is turned on ,that is about 10 seconds shortly after the motorcycle turned on the voltage generated is 11 mV at idle engine speed range from 1800 to 2000 rpm. The voltage will show stability at 664-665 mV after 15 minutes the motorcycle turned on at engine speed of 4500 rpm . Keywords: heat sinks, motorcycle exhaust pipe, energy conversion, thermoelectric generators,power generatio
Perubahan Spasial Permukiman Sulaa Baubau Pasca Reklamasi Pantai
No full text Sulaa is one of the coastal villages in Baubau, most people work as fishermen and weaver, therefore the sea is a very important part of their lives. Local Government has reclaimed Sulaa coast as an effort to solve abrasion that was faced by Sulaa’s people every year. The reclamation has impact on the social, economic, and cultural community. This paper aims to show the variety of spatial changes of settlements and spatial behavior of people in the postreclamation of the coastal settlement. This research uses Phenomonology paradigm and inductive analysis methods. The main instrument is the researcher ownself with the hypothesis that a researcher can see the object in its context, observes directly and improves the awarness continuously. This research showed there are spatial changes occured in post-reclamation of the coastal settlement, includes (1) a change in the spatial patterns and density of buildings, which is followed by a change in the orientation of the building and adjustment of space in their homes, especially the buildings in the area of reclamation;(2) spatial patterns of social, economic and cultural community tends to be oriented to the shore.Keywords: Spatial changes, post-reclamation of the coastal settlement, Sulaa
Aplikasi Isotop Alam untuk Mengetahui Asal-Usul Air Umbul Cokro, Kecamatan Tulung, Kabupaten Klaten
No full textDetermination of the goundwater origin of Umbul (spring) Cokro, at Klaten has been done by using environmental isotope tracers, i.e. carbon-13, deuterium, and oxygen-18. Groundwater samples were taken from springs and wells in surround of it, i.e. Wajong Wetan, Kemiri, Karang Podang, Sodong, and Karang Kendal. In the mean time, determination of groundwater genesis has been conducted by analyzing the composition of deuterium (2H) and oxygen-18 (18O) using mass spectrometer. While the direction of groundwater which has the same genesis is determined by analyzing of carbon-13 composition and will be verified by hydraulic gradient.If the composition of sample from suround is almost equal with sample from spring, hence groundwater from well flows to spring.The result of this research showed that δ13C composition of each sample is -12,92 + 4,20 until 5,56 + 4,31 o/oo PDB, that means that the sample include in Groundwater DissolvedInorganic Carbon; while analysis of deuterium and oxygen-18 indicated that composition of groundwater molecule in Sodong, Karang Podang, and Karang Kendal are almost equal to the spring, with δD composition = -52,00 + 0,77 o/oo and δ18O composition = -9,16 + 0,28 o/oo to Standard Mean Ocean Water (SMOW). Based on those results, groundwater of Umbul Cokro originally from Sodong, Karang Podang, and Karang Kendal.Keywords: groundwater, recharge area, Umbul Cokro, environmental isotope tracer
Analisis Pengaruh Jumlah Responden pada Evaluasi Usabilitas Aplikasi Edukasi Anak-Anak
No full text The development in technology for children is now increasing. In order to make the design and appearance of a software/application is easy to operate, run, and understood by children, an usability test is needed. One method that popular in usability testing is thinking aloud that takes at least 3-5 samples so the optimal problem can be found during test. This study aims to determine whether the needs of the number of respondents in the thinking aloud method is still relevant today, especially when applied to children, and to determine the effect of number of children involved in the test on usability problems found.This study involved 10 children assubjects with a mean age of 10,6 years to play educational application that run on Apple Ipad 2 named Candy Factory. However, the number of respondents in usability test on children's educational application has the effect that the more the number of respondents, the more problems found but only up to 4 respondents. More than 4 respondents, the usability problems that found is decreasing because the children keep revealing the same problem. One respondentwas able to found 45,45% usability problems, and 85% usability problems found by only 4 respondents. While 100 % usability problems can be found by 9 respondents. Moreover, the result of usability test analysis and recommendations for improvement of Candy Factory are explained.Keywords: usability, number of respondent, thinking aloud, educational game, childre
Latar Ombo, Fungsi dan Konsep Ruang Publik di Desa Tieng Kabupaten Wonosobo
No full textLatar ombo (a wide yard) at Tieng village Dieng Wonsobo has a function as a public area to hold cultural and tradition activities. The research questions are, how latar ombo function and role as public area society and what concept underline the building of latar ombo at the Tieng village.The research uses phenomenology by inductive technique. Data by collected by deep interview, the informans are ten peple.Based on inductive analysis about information units, it can be found three themes. Then these were discussed to know the local concepts of public space. The result shows that there are interrelation among latar ombos owned by people at Tieng village so that latar ombo becomes a public area which is needed by society.Keywords: public space, latar ombo, the concept of interrelatio
Rancangan Perumahan dan Interaksi Penghuni dengan Sekitar Studi Kasus : Perumahan Menengah Atas di Yogyakarta
No full textUpper middle-class housing has been growing fast in Yogyakarta, most of these being exclusive estate with limited acces. There has been curiosity that this condition minimizes interaction between in habitants of housing estate and people in the surrounding area. Therefore, the purpose of this study was to examine the relatianshif between housing layout, inhabitants’ interaction, and people in the surrounding area. The study was conducted in four Yogyakarta’s housing estate representhing the upper middle-class income community, they are Pertamina Complex Estate, Nandan Griya ldaman Estate, Griya lntan Permai Estate and Casa Grand Estate. The case study method was used to establish the relatianshif between housing layout and inhabitants’ interaction through comparison of cases. The results of the study show that the number of housing entrances, public, and commercial facilities as well as the obscure physical boundaries influence the interaction among inhabitants of housing estate and people in the surrounding area. The high expectation of safety, security warranty, and the housing surveillance minimised the interaction between in habitants of housing estates and people in the surrounding area eenwendfng ered. The design af the estates that enables local people to use the estates' facilities contributed to the increased interaction between inhabitants of housing estate and people in the surrounding area.Keywords: housing layout, public open space, interaction, upper midd/e-class, Yogyakart
Penjejak Pose Wajah Otomatis pada Sistem Pengenalan Wajah
Full text linkFace recognition systems have been widely used in various security applications, for example in attendance system. The success of face recognition system relies on the trained face images as well as the face image captured that being recognized. Among the variables that determine the success of face recognition is face pose. Previous works showed that frontal face pose produced the best face recognition success rate. This paper proposes a face pose tracking sub system that can be used as a filter so that only the frontal face pose that will be processed in the face recognition sub system. The criteria for various face poses, i.e. frontal, tilted and turned, either left or right, have been formulated. Experimental results showed that the success rate of face pose recognition were between 64% up to 96%, with average of 84,7%
Kebijakan Maintenance Berbasis Analisis Model Kerusakan Studi Kasus Pengoperasian & Pemeliharaan Turbin Uap di Pabrik Gula
No full textSteam turbine in sugar plant already used as prime mover for exchanged the earlier model was steam engine. In fact, the operation of steam turbine in milling season many failures accured and have not been predicted before so that the system have low in operation.In this research, steam turbine would be analyzed their failure mode during milling season. The model has been constructed from many failure mode data operation and maintenance that was taken for 4 years (2006-2009). Weibull rank regression is used for this analysis, with the results of 2 (two) weibull parameter, consist of number shape parameter β=2.99, scale parameter η=1967.Interpreting number of those weibull parameter based on bath tub curve failure mdel, indicated that the steam turbine failure characterized as wear out model with failure rate increasing to mission time. Average life MTBF=82 days (no stop milling, 1 day=24 hours).To determine maintenance policy based on prediction component life with the result of speed controller (MTBF=984.6 hours), governor valve (MTBF=1649 hours), bearing turbine (MTBF=1892 hours), and lubrication turbine system (MTBF=1026 hours).With the MTBF life data, we can control the operation and maintenance steam turbine in sugar plant so minimize risk and failure during milling season. Keywords : failure, MTBF, milling, maintenance, weibull paramete
Kenyamanan Visual Ruang Kerja Kantor
Full text linkVisual comfort Prameter is the level suficient of illumination recommended which is not exceed the threshold contrsat and stated brightness level, and no room glare occured. Not only to illuminate the work space, level of illumination also effects on the room condition (comfort and fun) that create a comfortable oflce work space.The goal of this research is to recognize the influence of furniture lay out and light spot placement on the work space, and if the color of materials effect on the reflectance value of wall and ceiling. In this study, descriptive metode applicated on the Dialux program concluded that light point and furniture lay out made effect on the illumination level of the work space, and the color of materials influence the effect of reflectance.This research is expected to serve as guidelines in designing office work space inaccordance with the recommended illumination level.Keywords: illumination, luminance, visual comfor