AFinite Element Model For A Selective Laser Sintering of A Polycarbonate Powder Block

A two dimensional finite element model was applied to determine temperature distribution within the layer block in the Selective Laser Sintering (SLS) of polycarbonate powders. Temperature time history and the sintering densification within the powder bed have been assumed to follow the solution of the heat conduction and the Nelson model (1993), respectively. The conductivity and the specific heat of the particle bed are treated as a function of temperature. In this model, shrinkage which usually occured after cooling is not considered. The results show that densification depends on the temperature distribution within the powder block and the laser power or the Andrew number

Studi Banding Pengelolaan Penelitian Di Universiti Putera Malaysia [UPM],Universiti Kebangsaan Malaysia [UKM}Dan Universiti Malaya [UM]

Kata kunci: Pengelolaan penelitian, Universiti Malaysi

EFEK APLIKASI SERICIN PADA HIDROKSIAPATIT TERHADAP PERLEKATAN SEL OSTEOBLAS

Hydroxyapatite (HA) is often used as a human bone grai Modification of HA surface is developed to increase osseointegration process which is influenced by cells attachment surrounded the tissue. Sericin has polar side groups which acceleratecells attachment. The aim of this researchwas to determine the effectof sericin application over HA surface on the attachment of osteoblast cells. The research used HA synthesizedfrom gypsum (Kulon Progo, Yogyakarta). Sericin was extracted from silkworm cocoonsof Bombyx mori. Sericin of 0.01, 0.05, 0.1% were applied over HA discs surface (10 mm in diameter, 3 mm thick). The discs were inserted into osteoblastcells culture of MC3T3El for attachment test. The data were analyzed by ANOV A and LSD. The result showed that the amount of osteoblast cells attached to HA (7.60I0.42) was significantly difference (p0.05). In conclusion, sericin application over HA surface increased the amount of osteoblast cells attachment. Concentrations of sericin application over HA (0.01, 0.05, 0.1%) did not influence osteoblastcells attachment

MAPPING THE DEGREE OF TECHNOLOGICAL CAPABILITY IN SMALL AND MEDIUM INDUSTRY OF AUTOMOTIVE COMPONENTS

The automotive industry is known to increase exports since 2015 and is predicted to continue to grow. To develop the industry, the government is known to issue several schemes, and one of them is in the form of mandatory rules for partnerships with the small and medium industrial sectors. However, there is no industrial, institutional map seen from various aspects, including technology, human resources, information, and organization. This map is essential and useful for stakeholders to develop the industry because it provides more directed assistance.In this study, the small and medium industries for processing metal automotive components in Tegal City are used as mapping objects. The technometric method is used to calculate the level of technology contribution they have. The results of this study indicate that the four aspects covering Technoware, Humanware, Infoware, and Orgaware for small and medium-sized automotive component processing industries in Tegal City are in a reasonable range. For improvement or guidance, production facility technology is the priority. Then proceed to employee competencies, information systems, and organizational management. Mapping should be done regularly every five years or less than five years as an evaluation

Analisi Kontribusi Komponen Teknologi UMKM Kota Bontang Menggunakan Metode Teknometrik

ABSTRAKKeberadaan usaha mikro kecil menengah di suatu daerah seperti kota Bontang penting bagi daerahtersebut karena dapat meningkatkan kesejahteraan penduduknya lebih cepat dibanding dengan sektor lainnya. Industri tersebut perlu dibina sehingga tumbuh sehat agar produknya diminati pasar. Namun demikian, pembinaan tersebut tidak dapat efektif karena tidak ada peta teknometrik yang dapat digunakan sebagai acuan. Dalam studi ini, peta teknometrik industri dibuat dengan tujuan untuk mendapatkan peta kemampuan tingkat kontribusi teknologi yang dimiliki industri dan hasilnyadidiskusikan. Usaha mikro kecil menengah berbasis pengolahan makanan yang tersebar di wilayah kota Bontang dijadikan sebagai obyek pemetaan dan metode teknometrik digunakan untuk menghitung tingkat kontribusi teknologi yang dimiliki. Hasil studi ini menunjukkan bahwa dari 4 aspek yang diteliti yang meliputi Technoware (fasilitas teknologi), Humanware (sumberdaya manusia), Infoware (kerangka kerja) dan Orgaware (manajemen) didapatkan hasil bahwa usaha mikro kecil menengah di kota Bontang masih menitik beratkan pada aspek humanware atau sumber daya manusia dengan kemampuan fasilitas teknologi produksi yang rendah

THE EFFECT OF 3D PRINTING MACHINE PARAMETERS IN EXTRUSION PROCESS OF BIOCOMPOSITE MATERIALS (PMMA AND HA) ON DIMENSIONAL ACCURACY

Bone implants are medical procedures involving replacement or reconstruction of missing or damaged bones with the patient's ones, natural substitutes or artificial substitutes. The widely used bone cement is a polymethylmethacrylate (PMMA) based composite material. To improve bioactivity, PMMA is combined with hydroxyapatite (HA). The manual formation can make bone implants during surgery. However, the method requires a longer operation time and raises the possibility of a higher error. Therefore, 3D printing technology is used to improve the quality of bone implants. One of the machines that can be used is the 3D printing machine, the property of the Product Design and Development Laboratory of Universitas Gadjah Mada. This machine needs to be tested to determine the accuracy of the prints, which is one indicator of product quality. Several machine parameters can be set in this machine setting. This study aims to determine the effect of three parameters, those are perimeter speed or edge print speed (20-40 mm / s), infill speed or inner print speed (50 - 70 mm / s), and fill angle or inner slope of inner printing (45 - 90 ° C). Before printing complex shapes, the machine was tested in advance with a more straightforward specimen design, which is a specimen design of flexural strength test. Response surface experiment design is used to determine the effect of three parameters on the dimensional accuracy which is measured through dimensional error. The results show that these three factors have no significant impact on the dimensional error, but the resulting error is still high. Therefore, it is necessary to adjust the design size before printing

Perbandingan Metode Rasional Dengan Kreatif Untuk Mendesain Alat Bantu Pasang Lampu

Abstract This article discusses the result comparison of design process of lamp installation device using rational and creative methods and its usability analysis. The study was conducted through team recruitment, prototype development, prototype selection, and usability testing. The teams recruited involved creative team (K-team) consisting of experienced technical expert and non-exact  students,  and  rational  team  (R-Team)  consisting  of  exact  students  with  knowledge  in product design method. Result of prototype selection using weighted objectives method showedthat  rational prototype  produced  higher  total  weight  compared  to  that  of  creative  prototype. Usability  testing  were  also  conducted  in  terms  of  rational  and  creative  prototype  methods. Usability  testing  involved  learnability,  error,  efficiency  of  use,  and  satisfaction.  Result  of usability testing showed that rational prototype had higher efficiency of use, lower error, and higher  satisfaction  level.  Therefore,  rational  method  becomes  better  design  process  in  lamp installation device.  Keywords: product design, creative method, rational method, usability, devic

Improvement of Andong Horseshoe Quality in Yogyakarta City to Support City Tourism

The Zero Kilometer Point is an important route for andong horses in Yogyakarta City. The renovation and replacement of road material with andesite can cause horses to slip because the horseshoes have not been adjusted to the new road material. If neglected, it can harm the horses and its owners, reducing the tourism industry in Yogyakarta. On the other hand, horseshoes demand is still met by small and medium enterprises (SME) without a well-standardized system. After doing technical testing to the existing horseshoe design, several alternative solutions were obtained for horseshoe redesign (1) by adding rubber pads and (2) serrated without rubber pads. Based on analysis and testing, it was found that horseshoe with the addition of rubber by 40% was able to increase the friction value to 0.54 or 10% from the initial condition. Besides improving the productivity and quality of SME horseshoe products, several solutions should be considered, including (1) change the layout design of SME by implementing 5S lean six sigma principles and (2) apply new methods/technology to maintain the standardization of horseshoe product. Implementation of both solutions will guarantee not only the quality product but also SME production. It is hoped that all the improvements that have been made will increase the quantity and quality of horseshoe products. Then it will also be able to improve the image of Yogyakarta City as a tourist city

Parameter Optimization of Customized FDM 3D Printer Machine for Biocomposite Material [Sago/PMMA] Using 2k Fractional Factorial Design

Bone fracture caused by various incident causes medical problems. Then bone restoration is required. Bone grafts can be used to solve this problem. One of the materials that can be used to produce bone graft is PMMA. PMMA requires to be combined with other materials to extend the solidification time. The material that can be used for bone graft material is sago starch. The main ingredient composition of Biocomposite [sago/PMMA] consists of sago: PMMA = 1 : 1 (w/w). The composition of the addition of MMA is 10% (v/w) of PMMA, this is to extend the curing time. Thus the material can be through from the chamber extruder to the nozzle. This research aims to obtain  combinations of 3D Printer FDM Customized machine parameters for minimizing of error dimension. The 3D Printer machine uses pneumatic system to push the material from the container to the chamber and used screw extruder to push the material out through the nozzle. The experimental design method used a 2k fractional factorial design, with 3 parameters, 2 levels and 3 responses. The experimental results obtained that the layer height parameter has a significant influence on the x-dimensional error. The optimization results obtained a combination of parameters to get the smallest error dimensions, the print speed is 25 mm/s, the layer height is 2.93 mm and the fill density is 20%. The results of optimization obtained that the x-dimensional error is 0.016, the y-dimensional error is 0.069 and the z-dimensional error is 0.4539