Surabaya, Indonesia
Surabaya, Indonesia

The State University of Surabaya was formerly named IKIP Surabaya is one of the state universities that was specially designed for graduating teachers, qualified for preschool, elementary, junior high, and senior high. In 1999, IKIP Surabaya changed its name to State University of Surabaya and has two main goals: graduate education and non-education students. It has seven faculties and one graduate school, 47 undergraduate programs, 12 diploma programs, and 15 postgraduate and doctorate programs. It has approximately 24,986 students and 834 lecturers . Wikipedia.


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Peeva P.D.,University of Duisburg - Essen | Palupi A.E.,University of Duisburg - Essen | Palupi A.E.,State University of Surabaya | Ulbricht M.,University of Duisburg - Essen
Separation and Purification Technology | Year: 2011

In the present work, polyethersulfone (PES) ultrafiltration (UF) membranes with molecular weight cut-off (MWCO) from 5 to 300 kDa were analyzed with respect to fouling during filtration of humic acid (HA) model solution. The impact of MWCO and prefiltration of the feed solution on the fouling behavior of these membranes is presented. Moreover, an UV-initiated graft copolymerization of poly(ethylene glycol) methacrylate (PEGMA) onto PES membranes was performed and the effect of the applied modification was examined in terms of MWCO and water permeability changes as well as performance during filtration of HA. Moreover, the fouling behavior and principles during the filtration were compared. Membranes with higher MWCO exhibited stronger flux decline during UF but better cleanability. Prefiltration through 0.45 μm filter improved the membrane performance during filtration of HA but the efficiency of physical cleaning was deteriorated. The applied modification improved the membrane performance during ultrafiltration and facilitated the physical cleaning. This work contributes to a better understanding of the relationships between membrane MWCO, solute size and size distribution, membrane surface chemistry and membrane fouling. © 2011 Elsevier B.V. All rights reserved.


Madlazim,State University of Surabaya
Science of Tsunami Hazards | Year: 2011

Indonesia has an Indonesian Tsunami Early Warning System (Ina-TEWS) since 2008. The Ina-TEWS has used automatic processing on hypocenter; Mwp, Mw (mB) and Mj. If earthquake occurred in Ocean, depth < 70 km and magnitude > 7, then Ina-TEWS announce early warning that the earthquake can generate tsunami. However, the announcement of the Ina-TEWS is still not accuracy. Purpose of this study is to estimate earthquake rupture duration of large Indonesia earthquakes that occurred in Indian Ocean, Java, Timor Sea, Banda Sea, Arafura Sea and Pacific Ocean using a direct procedure and software developed Lomax and Michelini for rapid assessment of earthquake tsunami potential by deriving two simple measures from vertical component broadband P-wave velocity record. The first is the high-frequency apparent rupture duration, Tdur which may be related to can be related to the critical parameters rupture length (L), depth (z), and shear modulus (μ). The second is a confirmation of the earlier finding by Lomax and Michelini, namely that the rupture duration has a stronger influence to generate tsunami than Mw and Depth. We analyzed at least 510 vertical seismogram recorded by GEOFON-IA and IRIS-DMC networks. Our analysis shows that the seismic potency, LWD, which is more obviously related to capability to generate a tsunami than former. The larger Tdur the larger is the seismic potency LWD because Tdur is proportional to L/vr (with vr - rupture velocity). We also suggest that tsunami potential is not directly related to the faulting type of source and for events that have rupture duration greater than 50 s, the earthquakes generated tsunami. With available real-time seismogram data, rapid calculation, rupture duration discriminant can be completed within 3 to 8 min after the P-onset.


Koestiari T.,State University of Surabaya
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2014

The objective of this research was to determine the Bentonite-Signa (B-S) and pillaring Al bentonite (B-Al/400oC) characters that can be used to adsorb Mg2+ ions. Laboratory experimental study consist of two stages, characterization phase of B-S and B-Al using Spectrophotometer IR Buck Scientific - 500, X-Ray Diffraction X'PERT Phillips, Gas Sorption Analyzer Quantachrome NovaWin2, Scanning Electron Microscope, and Atomic Absorption Spectrometer (AAS) Perkin Elmer AA-100 to showed adsoption capacity for two adsorbens. The result of this research showed: 1). B-S and B-Al have different of interlayer as 12,4374 A (B-S) and 9,3047 A (B-Al); surface area 24,78 m2/g (B-S) and 217,021 m2/g; total pore volume of radii which smaller than 1001,9 A (B-S) and 1273,1 A (B-Al), respectively. 2) The difference in the number of active sites of two adsorbents, cause the adsorption capacity of B-S is greater than that of B - Al. 3). At the system of pH 5, 6, 7, and 9 the adsorption capacities of B-S is greater than B-Al for Mg2+, respectively.


Buditjahjanto I.G.P.A.,State University of Surabaya | Miyauchi H.,Kumamoto University
International Journal of Information Technology and Decision Making | Year: 2011

Learning decision making through playing a game is an interesting activity for the decision maker or player. In this paper, a multiobjective optimization problem for economic and emission dispatch in which the player can learn about the tradeoff between fuel cost (economic) and emission problems to achieve optimal decisions is considered. A nonplayer character (NPC) is an entity that is built to provide intelligent decision support for the player. The proposed approach is carried out in two stages for the NPC module: the first stage uses the nondominated sorting genetic algorithm II method to solve the multiobjective optimization problem; this stage produces some optimal solutions. The next stage uses subtractive clustering to cluster optimal solutions; furthermore, these clusters are used to build a fuzzy inference system based on the Mamdani type. In this stage, players can select the best decision offered by the NPC. © 2011 World Scientific Publishing Company.


Madlazim,State University of Surabaya
AIP Conference Proceedings | Year: 2011

Indonesia has Indonesian Tsunami Early Warning System (Ina-TEWS) since 2008. The Ina-TEWS has used automatic processing on hypocenter; Mwp, Mw (mB) and Mj. If earthquake occurred in Ocean, depth < 70 km and magnitude > 7, then Ina-TEWS announce early warning that the earthquake can generate tsunami. However, the announcement of the Ina-TEWS is still not accuracy. Purposes of this research are to estimate earthquake rupture duration of large Indonesia earthquakes that occurred in Indian Ocean, Java, Timor sea, Banda sea, Arafura sea and Pasific ocean. We analyzed at least 330 vertical seismogram recorded by IRIS-DMC network using a direct procedure for rapid assessment of earthquake tsunami potential using simple measures on P-wave vertical seismograms on the velocity records, and the likelihood that the high-frequency, apparent rupture duration, Tdur. Tdur can be related to the critical parameters rupture length (L), depth (z), and shear modulus (μ) while Tdur may be related to wide (W), slip (D), z or μ. Our analysis shows that the rupture duration has a stronger influence to generate tsunami than Mw and depth. The rupture duration gives more information on tsunami impact, Mo/μ, depth and size than Mw and other currently used discriminants. We show more information which known from the rupture durations. The longer rupture duration, the shallower source of the earthquake. For rupture duration greater than 50 s, the depth less than 50 km, Mw greater than 7, the longer rupture length, because Tdur is proportional L and greater Mo/μ. Because Mo/μ is proportional L. So, with rupture duration information can be known information of the four parameters. We also suggest that tsunami potential is not directly related to the faulting type of source and for events that have rupture duration greater than 50 s, the earthquakes generated tsunami. With available real-time seismogram data, rapid calculation, rupture duration discriminant can be completed within 4-5 min after an earthquake occurs and thus can aid in effective, accuracy and reliable tsunami early warning for Indonesia region. © 2012 American Institute of Physics.


Buditjahjanto I.G.P.A.,State University of Surabaya
Journal of Theoretical and Applied Information Technology | Year: 2011

Decision-making plays important role for people. Almost every day they must decide a decision to solve their problems. Mistaken in selection a decision makes happen to lose in the competition. When the problem is in multi-objective problem, decision-making becomes very complicated. In this paper, the objective is to build an intelligent agent to help the decision maker or the player with a decision support while playing a serious game in economic and emission dispatch problem. This intelligent agent is constructed by two stages; the initial stage is multi-objective optimization problem that uses NSGA2 method. In this stage, NSGA2 results some optimal solutions. The next stage is clustering to cluster optimal solutions from first stage to be a small number of solutions. In this stage, we evaluate two clustering methods such as FCM, and FLVQ to accomplish the best method for build an intelligent agent which can offer several optimal solutions to the decision maker or the player. © 2005-2011 JATIT & LLS All rights reserved.


Buditjahjanto I.G.P.A.,State University of Surabaya
Journal of Theoretical and Applied Information Technology | Year: 2013

A computer as a learning medium has been used for many years lately. Yet, a computer game that is used as a learning medium not so many researches to measure the validity for a learning medium. Therefore the objective of this research is to measure the validity of computer game as a learning medium and the student's response after using the computer game. The Game Based Learning (GBL) method is used in this research. It has input-process output model of instructional games and learning that appropriate for development a game as a learning medium. By playing a game, GBL method can give enjoyment and experience for the players (students). The validation results of GBL as a learning medium shows significant outcome. The validation results come from three experts to assess three aspects such as: game aspects, the material of the problem and the construction of the problem. These aspects have criteria very valid for all the criteria of the instrument. Furthermore, we also measure responses from twenty students to appraise the aspects of computer game. These aspects consist of two aspects such as: the attractiveness of the computer game and the aspect of understanding of the material. These aspects also have criteria very valid for all the criteria of the instrument. © 2005 - 2013 JATIT & LLS. All rights reserved.


Madlazim,State University of Surabaya | Hariyono E.,State University of Surabaya
AIP Conference Proceedings | Year: 2014

The purpose of the study was to estimate P-wave rupture durations (Tdur), dominant periods (Td) and exceeds duration (T50Ex) simultaneously for local events, shallow earthquakes which occurred off the coast of Indonesia. Although the all earthquakes had parameters of magnitude more than 6,3 and depth less than 70 km, part of the earthquakes generated a tsunami while the other events (Mw=7.8) did not. Analysis using Joko Tingkir of the above stated parameters helped understand the tsunami generation of these earthquakes. Measurements from vertical component broadband P-wave quake velocity records and determination of the above stated parameters can provide a direct procedure for assessing rapidly the potential for tsunami generation. The results of the present study and the analysis of the seismic parameters helped explain why the events generated a tsunami, while the others did not. © 2014 AIP Publishing LLC.


The purpose of the research was to estimate P-wave rupture durations (Tdur), dominant periods (Td) and rupture durations greater than 50 seconds (T50Ex) for two large, shallow earthquakes, which occurred off the coast of Sumatra on 6 April and 25 October 2010. Although both earthquakes had similar parameters of magnitude and focal depth, the 25 October event (Mw=7.8) generated a tsunami while the 6 April event (Mw=7.8) did not. Analysis of the above stated parameters helped understand the mechanisms of tsunami generation of these two earthquakes. Measurements from vertical component broadband P-wave quake velocity records and determination of the above stated parameters could provide a direct procedure for assessing rapidly the potential for tsunami generation. The results of the present study and the analysis of the seismic parameters helped explain why one event generated a tsunami, while the other one did not.


Wahini M.,State University of Surabaya
IOP Conference Series: Materials Science and Engineering | Year: 2016

The date palm (Phoenix dactylifera L) is one of the oldest fruit plants that identical with people's lives in the Middle East including The Kingdom of Saudi Arabia since ancient times.The date palm is known and consumed by most of people in the form of fruit flesh, while its seed is discarded tough it is rich in nutrient. Therefore, need to be explored the potential of date seed through product innovation of foodstuffs with a high nutritional value. The aims of this study were to 1) know how to make flour from date seed, and 2) determine nutritional content of date seed's flour. This study was experiment and conducted in July, 2015 at the laboratory of food technology, Family Welfare Education department. Chemical analysis was used to determine nutrients content. The results showed that 1) the flour of date seed produced from the process of washing, soaking, flushing, boiling, draining, drying, grinding, and sieving; 2) the flour of date seed's flour have a macro nutrients value. This study explains that date seed is regarded as rubbish, in fact, it has a high value that can be an alternative substitution of wheat flour. © Published under licence by IOP Publishing Ltd.

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