Ternate, Indonesia
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Cipta I.,Khairun University | Limatahu N.A.,Khairun University | Hayatun S.,Khairun University | Kartini I.,Gadjah Mada University | Arryanto Y.,Gadjah Mada University
Asian Journal of Chemistry | Year: 2017

Effect of allophane from Gamalama volcanic soil to the properties of BiOI-Allophane had been studied in this work. Composite of BiOIallophane from Gamalama volcanic soil has the potential to be applied as a photocatalyst or photofuel under visible light radiation. Increasing the amount of allophane increase the surface area of 30.122 to 63.240 m2 g-1. Eg value of the resulted composite vary from 1.6-2.4 eV due to the various allophane amount.


Umar,Sepuluh Nopember Institute of Technology | Umar,Khairun University | Firdaus,Sepuluh Nopember Institute of Technology | Ashari M.,Sepuluh Nopember Institute of Technology | Penangsang O.,Sepuluh Nopember Institute of Technology
Proceeding - 2016 International Seminar on Intelligent Technology and Its Application, ISITIA 2016: Recent Trends in Intelligent Computational Technologies for Sustainable Energy | Year: 2016

DGs Technology has become the center of attention of the researchers and engineers because it is considered as an appropriate solution to overcome the shortage of electricity supply and power quality problems. DGs placement in appropriate locations with the right type and size is a challenging issue. This research discusses the simultaneous placement and sizing of multi-types of DGs in unbalanced radial distribution systems for power loss reduction and voltage deviation improvement while maintaining harmonics at the standard limit. The optimizations are performed simultaneously on three parameters; the locations, the types and the sizes of DGs. Genetic Algorithm (GA) is employed to ensure the optimal point is reached. The proposed method is applied on Kaliasin East Java radial distribution systems. The results show that the placement of four DGs type III are the most effective in reducing power loss and voltage deviation than the other scheme of optimization. The size of each DG is 175 kW+166.25 kVar. The active power loss reduction is 51.16%. All of individual harmonic (iHD) and total harmonic distortion (THD) are below the standard limit. © 2016 IEEE.


Umar,Sepuluh Nopember Institute of Technology | Umar,Khairun University | Firdaus,Sepuluh Nopember Institute of Technology | Penangsang O.,Sepuluh Nopember Institute of Technology
Proceeding - 2016 International Seminar on Intelligent Technology and Its Application, ISITIA 2016: Recent Trends in Intelligent Computational Technologies for Sustainable Energy | Year: 2016

The allocation of local active and reactive power in distribution systems is very important to meet customer demand and maintain the quality of electrical energy. Power loss and voltage deviation can be minimized by placing Distributed Generations (DGs) or Shunt Capacitor Banks (SCBs) in the right places and with the appropriate size. This paper discusses simultaneously placement and sizing of multiple DGs and SCBs in unbalanced distribution systems for power loss and voltage deviation reduction while maintaining harmonics at the IEEE-519 standard limit. Real Coded Genetic Algorithm (RCGA) is employed to determine the location and size of SCBs and DGs. The proposed method is applied on Modified Kaliasin radial distribution systems. The results show that the placement of the DGs on the bus 7, 8, 9, 10 is the most powerful results in reducing losses and voltage deviation compared to the other scheme. Placement 4 DGs with the size of each is 135 kW reduce the active power losses of 35.80% and the reactive power of 35.81%. The minimum bus voltage before and after placement DGs are 19.906 kV and 19.928 kV respectively. © 2016 IEEE.


Harisman Y.,Indonesia University of Education | Noto M.S.,Indonesia University of Education | Noto M.S.,Swadaya Gunung Djati University | Bakar M.T.,Indonesia University of Education | And 3 more authors.
Journal of Physics: Conference Series | Year: 2017

This article discusses about students' gesture between genders in answering problems of geometry. Gesture aims to check students' understanding which is undefined from their writings. This study is a qualitative research, there were seven questions given to two students of eight grade Junior High School who had the equal ability. The data of this study were collected from mathematical problem solving test, videoing students' presentation, and interviewing students by asking questions to check their understandings in geometry problems, in this case the researchers would observe the students' gesture. The result of this study revealed that there were patterns of gesture through students' conversation and prosodic cues, such as tones, intonation, speech rate and pause. Female students tended to give indecisive gestures, for instance bowing, hesitating, embarrassing, nodding many times in shifting cognitive comprehension, forwarding their body and asking questions to the interviewer when they found tough questions. However, male students acted some gestures such as playing their fingers, focusing on questions, taking longer time to answer hard questions, staying calm in shifting cognitive comprehension. We suggest to observe more sample and focus on students' gesture consistency in showing their understanding to solve the given problems. © Published under licence by IOP Publishing Ltd.


Arief A.,Khairun University | Wahab I.H.A.,Khairun University
Proceedings - 2016 3rd International Conference on Information Technology, Computer, and Electrical Engineering, ICITACEE 2016 | Year: 2017

In modern organizational, the use of information technology to support the achievement of organizational and business goals must be balanced with the effectiveness and efficiency of its management. Information technology infrastructure available in Dishubkominfo the Provincial Government of North Maluku Indonesia has not been optimized, the problem of lack of human resources to lead and management of information technology is not well managed and also the absence of control over the level of information technology security. This condition makes the direction of government policy in the field of Information Technology is not clear. Required a mechanisms information technology control so that measurable what has been done both advantages and disadvantages of the government's rules and policies are in accordance with international standards. This study uses the two frameworks: COBIT 5 and IT Security for Information Technology Audit. The Information Technology audit results of Dishubkominfo institution has the maturity level of information technology management at level 2 are Repeatable but Intuitive controls for mapping and principle of COBIT 5, while the average score of information security standard ISO/IEC 17799:2005 was 39%. The results of data processing to find value - average for the domain APO and MEA was 1.71 and the value - average for principle is 1.98 latter value - average for the maturity level of information security standard ISO/IEC 17799:2005 is 31 or 39%, which means that the security of information technology is still very less and should be highly improved. © 2016 IEEE.


Cipta I.,Khairun University | Limatahu N.A.,Khairun University | Nur Abu S.H.,Khairun University | Kartini I.,Gadjah Mada University | Arryanto Y.,Gadjah Mada University
Asian Journal of Chemistry | Year: 2017

Extraction of allophane particles from Gamalama volcanic soil have been performed and characterized by using FTIR, XRD, SEM-EDX and TEM. Gamalama volcanic soil sample was dried in air for 5 days and crushed into 200 mesh particle size. The sample is then treated with 10 % H2O2 and dispered at pH 10 by addition of 2 M NaOH. Colloid layer about 10 cm from the surface of the solution was taken after decanted for 10-20 h. Allophane were collected by centrifuge. The FTIR spectra shows peaks which are vibration characteristic of alluminosilicate. X-ray diffraction result proved that allophane is non-crystalline aluminosilicate mineral. TEM result has confirmed that the resulted allophane is spherule with diameter about 4 nm. The nature of allophane to form globular aggregates has confirmed by SEM. In the isolated allophane, Si/Al ratio is 1.45.


Wahab I.H.A.,Khairun University | Arief A.,Khairun University
ICITACEE 2015 - 2nd International Conference on Information Technology, Computer, and Electrical Engineering: Green Technology Strengthening in Information Technology, Electrical and Computer Engineering Implementation, Proceedings | Year: 2016

To implement the good IT governance in local governance, we need an IT governance design for mature and appropriate models. There are some problems that appear in designing information technology governance in local government. The problem is how to control the information technology risk management at the operational level and designing information technology in mapping an integrated framework. So this led to the adoption of information technology in local government to be inefficient. This study proposes an integrated model framework of COBIT and TOGAF to design more comprehensive IT Governance to increase the efficiency of the application of IT in local government. An integrated model to solve the problem of IT risk management control are using the COBIT 5 framework. To solve the problem in designing an integrated IT governance is used TOGAF 9.1 framework. The result is the integration model combines three aspects: governance area, 6 principles and management area are used for the effective application of IT governance in local government. © 2015 IEEE.


Ilyas A.M.,Khairun University | Rahman M.N.,Khairun University
Telkomnika | Year: 2012

Fuel cost of a thermal generator is its own load functions. In this research, Modified Improved Particle Swarm Optimization (MIPSO) is applied to calculate economic dispatch. Constriction Factor Approach (CFA) is used to modify IPSO algorithm because of the advantage to improve the ability of global searching and to avoid local minimum, so that the time needed to converge become faster. Simulation results achieved by using MIPSO method at the time of peak load of of 9602 MW, obtained generation cost is Rp 7,366,912,798,34 per hour, while generation cost of real system is Rp. 7,724,012,070.30 per hour. From the simulation result can be concluded that MIPSO can reduce the generation cost of 500 kV Jawa Bali transmission system of Rp 357,099,271.96 per hour or equal to 4,64%.


Najamuddin,Khairun University | Prartono T.,Bogor Agricultural University | Sanusi H.S.,Bogor Agricultural University | Nurjaya I.W.,Bogor Agricultural University
Marine Pollution Bulletin | Year: 2016

Lead (Pb) and zinc (Zn) concentrations from surface sediments were determined at 17 stations in riverine, estuarine, and marine environments during the wet and dry seasons. The geochemical fractionations were obtained by a sequential extraction procedure in five geochemical forms: exchangeable, bound to carbonate, iron-manganese oxide, organic, and residual fractions. The concentrations of Pb and Zn in the water were higher during the wet season than the dry season and higher in the riverine and marine samples than the estuarine samples. Following geochemical fractionation, the metals were found mainly in the residual fraction. The results indicated that the concentrations were influenced by season, with the sources of Pb and Zn derived mainly from rivers and natural sources. The contamination status in the estuary of the Jeneberang River was classified as weak to moderate pollution and the risk level to aquatic biota attributed was no risk to low risk. © 2016.


Liestianty D.,Khairun University | Rodianawati I.,Khairun University
International Journal of Applied Engineering Research | Year: 2015

Encapsulation of protein extract of phytoplanktonwas conducted. The research aims at testing thefeasibility of phytoplanktonextractsto be usedin encapsulated sago food with maltodekstrin. The analysis method was Lowry andscanning electron microscopy (SEM). The results indicated that protein extracts of Dunaliellasalina had a high rendament content afterencapsulating process, respectively 1.4 % and 0.407 % while the application of maltodekstrin was 5 percent. The highest protein content after the application of 30 % of protein extract of Dunaliellasalina to sago starch products was 9.19 mg/g. © Research India Publications.

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