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IPTEK Journal of Engineering
ISSN : -     EISSN : 23378557     DOI : -
Core Subject : Science,
IPTEK The Journal of Engineering (E-ISSN: 2337-8557) is an academic journal on the issued related to engineering and technology. Published actually in April, August, and December. It is open to all scientist, researchers, education practitioners, and other scholars. Therefore this journal welcomes various topics that have received by Professors and Doctors specifying related studies, and they come from reputable universities all over Indonesia and universities abroad.
Arjuna Subject : -
Articles 41 Documents
THE EFFECT OF FEEDWATER HEATERS OPERATION SCHEMES TO A 200 MW STEAM POWER PLANT HEAT RATE USING CYCLE-TEMPO SOFTWARE Wijaya, Adi Apriyanto; Widodo, Budi Utomo Kukuh
IPTEK The Journal of Engineering Vol 4, No 3 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v4i3.a4995

Abstract

There are several ways to improve performance of Rankine cycle which is implemented at steam power plant, regenerative feedwater heating is one of the methods. Some failures in closed feedwater heaters such as, water leak through manhole and tube leakage may happen during operation of the plant. Repairing such failures may take some period of time and must shut off the operation of the feedwater heaters. Further study is needed to evaluate the effect of closed feedwater heater in off-service condition against the steam power plant?s performance. This study varies off-service condition of closed feedwater heaters applying thermodynamics analysis and modeled through Cycle-Tempo software. There are 12 possible feedwater heater operation schemes. Based on the heat balance and equipment design of a 200 MW Steam Power Plant at Jakarta-Indonesia, this study concluded that the NPHR might increase as much as 0.96% and 0.39% due to the off-service of any HPH and the off-service of any LPH respectively. Schemes of 2 off-service feedwater heaters summed up with 1.37% increase of NPHR.
VARIABILITY OF SEA SURFACE TEMPERATURE IN INDONESIA BASED ON AQUA MODIS SATELLITE DATA Yunita, Nurul Fatimah; Zikra, Muhammad
IPTEK The Journal of Engineering Vol 3, No 3 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v3i3.a3083

Abstract

Sea surface temperature (SST) is one of the oceanographic factor in seawater. Its value depends on several factors. In indonesia, SST value depend on season and location. The aims of this study are to analyze the spatial and temporal variability of SST using 10-years (2007-2016) Aqua Modis satellite data. The result shows that the average of SST in Indonesia ranges from  27 ? 31 °C depending on location. SST in equator area range from 30 ? 31 °C and in nonequator area range from 27 ? 30 °C. Monthly and seasonal variation of SST also show different value for each area in the indonesian region.
DEVELOPING CITIZEN RELATIONSHIP MANAGEMENT (CIRM) ORIENTED E-GOVERNMENT MATURITY MODEL Wulansari, Anita; Subriadi, Apol Pribadi
IPTEK The Journal of Engineering Vol 3, No 1 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v3i1.a2268

Abstract

CiRM (Citizen Relationship Management) has an important role in the government because it puts citizen in the best interests. So far the implementation of e-government only focused on the technology assimilation process. Since existing e-government maturity assessment models only measure the ability of e-government technology, they lack in consideration towards citizen needs.  Therefore an e-government maturity assessment model is developed by incorporating elements of CiRM. The model was developed through a grounded theory qualitative study approach. The object of this research is e-government application owned by the city of Surabaya. This research developed CiRM oriented e-government maturity model consisted of organization, interaction, service and citizen insight dimensions. This model then was used to assess the maturity of CiRM oriented e-government implementation of Surabaya Single Window (SSW) online service
OPINION EXTRACTION OF PUBLIC FIGURE BASED ON SENTIMENT ANALYSIS FROM TWITTER Hayatin, Nur; Mentari, Mustika; Izzah, Abidatul
IPTEK The Journal of Engineering Vol 1, No 1 (2014)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v1i1.a434

Abstract

Twitter is a microblog that can generate an information from users such as sentiment about public figures. Sentiment analysis of public figure interpret the positive or negative response. This study aims to create system that automatically can extract the opinion about public figure based on sentiment analysis in twitter using two novel features, they are specific term and number of followers public figures lover and hater. Several step to determine the sentiment of public figure are preprocessing, weighting, classifying, and determining sentiment response. In this paper we use six public figures to be observed. This research resulting precision 99%, recall 75%, and accuracy 76,67%.
ESTIMATION OF THE SOURCE PARAMETERS OF THE FLORES EARTHQUAKE AND THEIR CORRELATION TO AFTERSHOCKS Banggut, Emanuel Destianus; Santosa, Bagus Jaya
IPTEK The Journal of Engineering Vol 5, No 1 (2019)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v5i1.a5021

Abstract

This study uses data provided by BMKG Indonesia which is downloaded from the website www.webdc.eu. The data processing is done by using some software, one of them is Matlab to run Isola software. The software provides information about the fault direction. In addition, this study also uses Coulomb 3.3 software to provide information on subsequent earthquake forecasts. The results showed that the earthquake that occurred on 27th February 2015 gave impact to Coulomb's increase and decrease of stress to some areas in the northern mainland of Flores. The impact of this major earthquake is expected to trigger an earthquake that occurred in northern Flores. Based on the results of data processing obtained form focal mechanism is oblique reverse with the first nodal value strike 139, dip 73, and rake 50. While on the second nodal has a strike value 30, dip 43, and rake 154. Main earthquake impact Coulomb stress increase of 0.15-0.2 bar. Meanwhile, Coulomb stress result obtained shear value -18.890, normal -0.217, and Coulomb -19.976.
BEHAVIOR OF TRIP LENGTH DISTRIBUTION PATTERN DUE TO THE VARIATION OF TRIP LENGTH INTERVAL DETERMINATION Suprayitno, Hitapriya; Ratnasari, Vita; Saraswati, Nina
IPTEK The Journal of Engineering Vol 4, No 1 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v4i1.a3561

Abstract

Transport Model is always needed and important for developing Transportation System Master Plan. Trip Distribution is one of the important parts of Transport Model, which is a result mathematical operation of trip generation and deterrence function. Trip Length Distribution Pattern is the foundation of Deterrence Function. The trip length distribution pattern can change due to the various trip length interval used. Analog to this, the Deterrence Function can also change. The research result indicate that the distribution pattern change significantly on trip length interval 1 to 3 km. For trip length interval of 4 to 8 km, the trip length distribution indicate the general characteristic of trip length distribution, i.e. the number of trips is high in short distance and getting down in the longer trip distance. The trip interval of 7 km gives the most accepted Tanner Deterrence Function.
ESTIMATION RISK OF HIGH RISK BUILDING PROJECT ON CONTRACTOR Basari, Imayanti
IPTEK The Journal of Engineering Vol 3, No 2 (2017)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v3i2.a2790

Abstract

The increasing need for space and limited land especially in big cities cause many high rise building projects in Indonesia. Construction projects including high rise building projects are located in complex and dynamic environments result in high levels of uncertainty and risk. Risks are always present in construction projects and often lead to delay schedules or cost overruns. Risk management is a process consisting of risk identification, qualitative and quantitative assessment, response with appropriate methods of handling and risk control. The concept of risk management is becoming very popular in a number of businesses. Many companies often create risk management procedures in their projects to improve performance, minimize losses and increase profits Risk event from a different project is different from the risk event on another project. Likewise, the level of occurrence and impact in each project is always changing from one project to another. This makes it difficult for management to handle risks on new projects. Lack of risk management, even inadequate risk analysis, can put construction projects in jeopardy. This research looked for alternatives to get risk event, concequance or impact estimates and likelihood or generic possibilities in order to be used to control the risk of subsequent high rise building projects. This research involves several high rise building projects that will be used as a basis for determining risk events, concequance or impact and likelihood or possibilities. In this study used qualitative methods, and data analysis is done by statistical analysis by finding the average of available data. Estimation this risk can help contractors, especially in the field of high rise building to manage risk both from risk factors, likelihood and consequence.
THE COMPARISSON BETWEEN LBP AND SQI METHODS IN THE SURFACE ROUGHNESS MEASUREMENT USING ESPI METHOD Effendi, Mohammad Khoirul; Pramono, Agus Sigit; Pratama, Pandu; Wardana, Rifki
IPTEK The Journal of Engineering Vol 2, No 1 (2015)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v2i1.a470

Abstract

Surface roughness measurement using direct contact methods raises several issues, for examples stylus wear and size limitation problems. Furthermore non-contact methods are proposed to solve these problems. One of them is Electronic Speckle Pattern Interferometry (ESPI), which use Helium-Neon (He - Ne) as laser light source. A speckle pattern is produced by scattered light on the surface of the measuring object due to the interference of laser beams, and it will be captured by Charge Coupled Device (CCD) camera. Afterwards Linear Binary Pattern (LBP) and Self Quotient Image (SQI) methods are used to reduce illumination effect in the captured image. The average gray-level from the previous process will be converted into a surface roughness value by gray level to surface roughness conversion formulation. It is obtained from correlation value between gray level and a set of standard roughness. The standard roughness value range is start from 0,05 ?m to 12,5 ?m. It is measured from five different final machining process, which are flat lapping, grinding, horizontal milling, and vertical milling. As verification, the results of ESPI method will be compared with the result of direct contact tools using Mitutoyo Surftest 301 and 401.
NUMERICAL INVESTIGATION OF OVER FIRE AIR (OFA) EFFECT ON FLOW CHARACTERISTICS, NOX COMBUSTION AND EMISSION IN A 600 MW TANGENTIALLY FIRED PULVERIZED COAL BOILER Seputro, Setiawan; Sudarmanta, Bambang
IPTEK The Journal of Engineering Vol 5, No 2 (2019)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v5i2.a5017

Abstract

One of the coal-fired air emissions in boilers is NOx, which has a significant impact on the environment and could cause acid rain, ozone formation, visual impairment and health problems in humans. There are several technologies to reduce and control the formation of NOx emissions, which one of these technologies is the use of over-fire air (OFA). In this research will observe the effect of overfire air (OFA) usage and analyze by numerical 3D modeling method using computational fluid dynamics (CFD) in Paiton 9 power plant boiler and analyzed for 5 (five) OFA damper opening variations, i.e 0%, 25%, 50 %, 75% and 100%. This research will analyze several factors that have significant influence on NOx emission formation, that are: the temperature distribution of the boiler during the combustion process, the distribution of nitrogen oxide (NO) and carbon dioxide (CO2), direction of flue gas flow and trajectory of coal particles and residence time indicating the length of time of burning. The results showed that the lower the flame temperature, the smaller the formation of NOx; the smaller the oxygen content in the combustion process, the smaller the formation of NOx; the shorter the residence time of combustion products in the high temperature zone the smaller the formation of NOx, and the smaller the nitrogen content in coal, the smaller the formation of NOx.
ENERGY AUDITING AT BLOCK 1 MUARA KARANG COMBINED CYCLE POWER PLANT Setyanto, Andy; Putra, Ary Bachtiar Krishna
IPTEK The Journal of Engineering Vol 4, No 3 (2018)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v4i3.a5016

Abstract

Setiap tahun pertumbuhan listrik selalu mengalami kenaikan. Namun pertumbuhan yang terus meningkat itulah perlu adanya kontrol kedepannya agar pemanfaatannya lebih efektif dan efisien. Selain itu, dengan pemanfaatan energi yang tepat guna akan berdampak pada pelestarian lingkungan dan menjaga kelangsungan hidup lingkungan sekitar. Di Indonesia sendiri, telah diatur terkait pemanfaatan energi yang efisien yaitu dengan disahkannya PP Republik Indonesia Nomor 70 tahun 2009. Metode yang digunakan pada penelitian ini adalah dengan melaksanakan audit energi pada pembangkit listrik PLTGU blok 1 Muara Karang. Penelitian ini diawali dari pengumpulan data operasi lalu melakukan perhitungan unjuk kerja peralatan utama. Hasil perhitungan selanjutnya dibandingkan dengan data komisioning tahun 1995. Dari perhitungan didapatkan profil konsumsi energi dan mencari gap terbesar antara perbandingan unjuk kerja aktual dengan komisioning tahun 1995. Selanjutnya gap dianalisa penyebab peralatan tidak efisien dan melakukan studi lapangan. Setelah itu diberikan rekomendasi potensi hemat energi untuk meningkatkan efisiensi dari peralatan. Rekomendasi yang diberikan dianalisa dengan studi ekonomi untuk memberikan alternative solusi perbaikan bagi manajemen.Every year electricity growth in the world always increases. But the growing growth is the need for future controls in order to make the utilization more effective and efficient. In addition, with the utilization of appropriate energy will have an impact on the preservation of the surrounding environment. In Indonesia, has been regulated related to the efficient utilization of energy by the enactment of Government Regulation No 70 of 2009 of Energy Conservation. The method used for this research is to conduct an energy audit on PLTGU Block 1 Combined Cycle Power Plant (CCPP) Muara Karang. This audit is begin from collecting operating parameters? data then conducting the performance calculation of the main equipment. The result of the calculation then compared with commissioning data in 1995. From the calculation obtained the profile of energy use and find the largest gap from the comparison between actual performance with commissioning in 1995. The gap is then analyzed the cause of equipment inefficiency and conducted field study. After that is given the recommendation of Energy Saving Potential to be able to improve the efficiency of the equipment. The recommendations are analyzed by economic studies to provide alternative improvements solution for management.