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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 6 Documents

Search results for , issue "Vol 28, No 3 (2017)" : 6 Documents clear

A study on Cold-formed Steel Frame Connection: A review Komara, Indra; Wahyuni, Endah; Suprobo, Priyo
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

This paper is aimed to review the current researches on Cold-formed steel (CFS) structures, particularly for screw connections, welded connections, bolted connections and adhesive connections. Connection presents as a major parameter of the important elements for CFS framing system in order to attain its structural stability. The performance of different CFS connections is well-discussed in order to capture the behaviour of each type of connection. Based on the review assessment, the results highlighted that all types of connections except adhesive connections have shown the proper behaviour that can trigger the change of any design codes. Otherwise, adhesive connection is given several advantages that leads a novelty in the construction technology. Hence it still has some gaps of knowledge that are needed to be filled with comprehensive future researches.

A Review on Risk Factors in the Project of Oil and Gas Industry Rodhi, Nova Nevila; Anwar, Nadjadji; Artama Wiguna, I Putu
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

In Each activity in the oil and gas industry there are risks that could hamper the project and also there is a huge risk to the environment, social and economic. Besides oil and gas industry projects also have the potential to be dangerous to life, property and the environment, the hazard can occur if the activity is not controlled and regulated by appropriate. Basically, the disaster is certainly not possible to be planned and can occur at any time. But the circumstances of a disaster can be anticipated, that is the way to plan preventive measures and control.Based on the description above, this paper aims to discuss risk factors and risk assessment techniques that can help sustainable development programs. From the results of this study note that the risk factors of projects in the oil and gas industry is very complex, so a risk analysis must be done from various aspects, namely the project itself, the environment and disaster and should be integrated with aspects of sustainable development. As for the suggested technique is a combination of monte carlo and system dynamics.

CFD Analysis into the Drag Estimation of Smooth and Roughened Surface Due to Marine Biofouling Baital, Muh. Sawal; Pria Utama, I Ketut Aria
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

This study is to investigate drag on ship due to marine biofouling using CFD approach. A cargo ship with one year operation was used for the study and to examine the effect of biofouling between smooth and roughened hull by observing the result of CFD simulation. Simulation is done using CFD software based RANSE code together with SST based k-omega as turbulence setting and Grid Generator was used to build the hybrid grids. The result indicated that marine biofouling make significant increase for ship resistance up to 37 %. This fact is in good agreement with experimental test has been examined that fouling increases drag up to 80 % for two years.

Study of the Recharge Area on Water Basin Soil with Remote Sensing Method Using Satellite Imagery Landsat 7 ETM + and Geographic Information Systems ( GIS ) (Case Study : Pasuruan District ) Isniyatus Sholikhah; Muhammad Taufik; Kukuh Sudjatmiko
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Water is natural resources that is very essential for living creatures and the environment. Along with the increase of population , will increase the water demand and reduce the area of free land / open green space for the formation of ground water. By considering soil water conservation aspects, it is necessary to conduct a study of the recharge area on water basin soil in Pasuruan. This study was to determine the condition of the recharge area in the Basin Groundwater Pasuruan in 2003 and 2014. So it will be k[1]nown the changes of the vegetations density and land cover in the recharge area that can affect infiltration process in order to conserve water resources in CAT Pasuruan. From these changes it would be able to make the prediction of future conditions in the recharge area in CAT Pasuruan. This study uses Remote Sensing using Satellite imagery Landsat and Geographic Information System (GIS). Studies to determine the recharge area is influenced by several parameters, that is slope of land, lithology and Rainfall. Processing results obtained vegetation density changes of the recharge area in 2003-2014, high vegetation density decreased by 4330,89 Ha, so that changes in the high vegetation density in 2025 is predicted to be 52305,39 Ha and become 52176,78 Ha in 2030. While land cover changes produce changes in forest land cover increased by 569,88 Ha , so that changes in forest land cover in 2025 is predicted to be 37563,88 Ha and became 38720,494 Ha in 2030. The relationship between vegetation density and land cover of the recharge area in 2003 - 2014 obtained high vegetation density that experienced an increase area, which is on garden land cover amounting to 1144,80 Ha, 943,02 Ha of forest, 947,79 Ha of settlements land cover and 262,53 Ha of vacant land. And that experienced an increase with low vegetation density are the fields amounting to 943,02 Ha and 277,47 Ha of vacant land. Land cover vegetations that dominates throughout the recharge area is a mahogany tree vegetation, and sengon.

An Investigation Into The Drag Increase on Roughen Surface due to Marine Fouling Growth A. K. Yusim; I. K. A. P. Utama
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Marine biofouling attached to underwater ship hull has caused problems for many years to ship operators. It has been reported to increase the total drag thus can reduce the speed of ship and disturb the overall operation of marine vehicles. Changes laminar to turbulent flow becomes fast when passing through rough ships surface. The current study models the growth of marine fouling for one year periods basis on general cargo vessel. The methods have been used in this studied was model scale 1 : 53. The use of smooth model is also included in order to analyses the difference between the two conditions. Two models of the hull roughness are regular and irregular roughness. The modeling of roughness using sand with a specific size and have been scaled. The results show that an increase in skin friction drag of about 41% per year for biofouling spread not evenly at wetted surface area (WSA).

Stability Analysis of Catamaran Passenger Vessel with Solar Cell Energy in Calm Water Dedi Budi Purwanto; Aries Sulisetyono; Teguh Putranto
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

The use of solar energy as the driving force for the ship's tour seems to be a major theme in efforts to create a marine transportation that are environmentally friendly as part of the Energy Efficiency Design Index (EEDI) for the reduction of pollutant levels. The electrical energy generated by solar energy is not as much energy from fossil fuels so that the solar panel powered ship that can only be engaging with a limited range and speed.This type of catamaran hull design that has two symmetrical hull which allows to have an expansive deck, small boat barriers and good stability. The shape of the deck of the ship will contribute extents solar panels that can be utilized as a producer of power required at the time of calculation of powering the vessel. The analysis of the stability of the vessel performed numerically with reference to the IMO regulations requiring minimum value stability arm at certain angles. The output of this research is catamaran vessel that have battery, solar panel, electric motor moving with speed 5 knots.

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