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IPTEK The Journal for Technology and Science

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Published by Institut Teknologi Sepuluh Nopember Surabaya

ISSN : 08534098 EISSN : 20882033 DOI : -

Core Subject : Science,

Computer Science & IT

IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.

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Articles 5 Documents

Search results for , issue "Vol 28, No 1 (2017)" : 5 Documents clear

Mechanical Properties and Thermal Stability of Epoxy/RTV Silicone Rubber Pakaya, Fahriadi; Ardhyananta, Hosta; Wicaksono, Sigit Tri
IPTEK The Journal for Technology and Science Vol 28, No 1 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Epoxy products have been widely applied in industries such as in the fields of automotive, mechanical, electrical, and chemical engineering. Epoxy modified to be done to improve the mechanical properties, thermal stability, physics and chemical resistance. Using of other compounds as curing agents has long been commercialized, but the constraints posed is application of an epoxy thermoset on areas requiring impact strength and thermal stability are still low. One of the modification that has been done is addition of other material as the second material to improve properties of thermoset epoxy. Preparation of research material obtained through the provision of a second material that is RTV silicone rubber. The aim of research to analyze effect of RTV silicone rubber composition (0, 5, 10, 15, 20) wt% of the mechanical properties and thermal stability of thermoset epoxy. Testing and characterization conducted on thermoset epoxy by the addition of RTV silicone rubber. In addition RTV silicone rubber: tensile strength, elongation at break and hardness has decreased, energy and impact strength increased maximum on the addition of 15% RTV silicone rubber respectively 0.294 J and 6175 J / m2. The maximum degradation of temperature increase in the addition of 15% RTV silicone rubber is 328 and 349oC respectively at 5 and 10% degradation.

Time Series Analysis of Sea Surface Temperature With Aqua MODIS from 2011 to 2016. Case Studi: North Coast of Gresik and Madura Hendrata Wibisana; Siti Zainab
IPTEK The Journal for Technology and Science Vol 28, No 1 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Sea surface temperature (SST) is a measurement parameter for the condition of coastal and marine water quality, where the value of SST is a measure of fertility of ecosystems in the waters concerning the lives of flora and fauna. To measure the SST can be done by several methods, simple by using a alcohol thermometer dipped into the sea and water bodies to obtain the existing value of the SPL. To measure a wider area in order to obtain a global picture of course is not effective to measure in situ, we need a technology and methods that can replace the monitoring of the global SST, for the purposes of the use of remote sensing technologies by using algorithms that have been widely used. As the material in this study used satellite imagery Aqua Modis 250 meters during January from 2011 to 2016 that can instantly detect the SST value at some predetermined coordinates and as a case study area have Gresik coast towards the northern part of the island of Madura. The results obtained from this study is that the range value of standard deviation and variation of the average value of SST per year, which the SST is in the range of 27oC to 32oC, and from linear regression obtained an average value of R squared of 0.748 for a period of 6 years the process of aquisition of satellite imagery. The coastal area around the north Pangkah Gresik has the highest temperature is 31oC while the waters to the north of Madura has an average temperature of 28oC.

Effect of Screw Diameter in Femoral Fracture Fixation Modeled by Finite Element Method Muhammad Nashrullah; Belladina Clara Shinta; Mas Irfan P. Hidayat; Agung Purniawan; Yuli Setiyorini
IPTEK The Journal for Technology and Science Vol 28, No 1 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Research in the field of biomechanics related to orthopedic implants is rapidly growing in the world, especially for fixation of fractured bone. Fixation is a surgery to locate and attach a plate pressed by screws at the fractured bone. Most of the fracture bones sited in femur. This research focuses on modeling and simulation of plate and screw made of SS316L material for the fixation of the fractured femur using finite element method (FEM). SS316L is a material with good biocompatibility, cheap, and ductile enough. Modeling and simulation done using ANSYS 15.0 software. Simulation results are stress, strain, and total deformation. It is obtained that optimum diameter of screw is 4.5 mm with respect to minimum value of von Mises stress and deformation.

Analysis of Main Morphometry Characteristic of Watershed and It’s Effect to The Hydrograph Parameters I Gede Tunas; Nadjadji Anwar; Umboro Lasminto
IPTEK The Journal for Technology and Science Vol 28, No 1 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Until today, the development of synthetic unit hydrograph model is still based on morphometry characteristic of watershed or combine with other parameters. According to Sri Harto (1985), There are at least four main characteristic morphometry of watershed which highly influenced to the hydrograph and can be easily quantified namely watershed area (A), main river length (L), main river slope (S) and form factor (FB). This research aim is to analyze and verify these four factors and it’s effect to the three of hydrograph parameters i.e. peak time (TP), peak flow (QP) and base time (TB). This research was carried out in eight watersheds in Central Sulawesi Province  Indonesia as the base of variable preparation to develop synthetic unit hydrograph model. Main morphometry analysis of watershed was conducted by using geographical information system (GIS) software, referring to Indonesia Topographic Map (RBI) data combined with Digital Elevation Model-Shuttle Radar Topographic Mission (DEM-SRTM) data, to determine the area (A), main river length (L), main river slope (S) and form factor (FB) of every analyzed watershed. The research showed that eight observed watersheds had an area (A) of 23.88 km2 to 144.73 km2, main river length (L) of 10.31 km to 28.69 km, main river slope (S) of 0.03422 to 0.10812 and form factor (FB) of 0.21 to 0.49. From correlation analysis, It seen that the watershed area affected very well to peak flow (QP) with correlation coefficient of 0.98. The main river length also affected very well to the peak time (TP) with correlation coefficient of 0.99. Two others morphometry parameters namely main river slope (S) and form factor (FB) did not show the effect which could be concluded. These two parameters showed low correlation coefficient.

Analysis of MARIA Reactor Safety Based on Efficiency Measurement of Shim Rod Using Method of Fixed Period Rachmatulloh, Hafizh Fatah; Pytel, Krzysztof; Siti Aisjah, Aulia
IPTEK The Journal for Technology and Science Vol 28, No 1 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

An experiment was conducted in MARIA reactor as the part of reactivity measurement inside the reactor using method of fixed period while MARIA reactor was being started up. It was important as performance indicator that shim rod worked well and able to maintain reactivity on the level not exceeding the value of 1$ by compensating the excess reactivity to provide reactor safety. The measurement was done directly at MARIA reactor control room on April 28th, 2015 using digital reactimeter, therefore, it allowed performing continuous measurement of reactor reactivity. Data at shim rod â€“ 5 (PK-5) was collected, with time interval 0.49 S. Preliminary calculations were done by neglecting the presence of photoneutrons. For the result, at full shim rod insertion (1067 mm) absorbed reactivity with value 0,92$ was obtained. The result showed that the shim rod worked well because the reactivity never exceeding 1$. The result as an early parameter that guarantees MARIA reactor safety from burning out the claddings of fuel elements and radiological accident.

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