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INDONESIA
International Journal of Science and Engineering (IJSE)
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
The scope of journal covers all area in the application on chemical, physical, mathematical, biological, agricultural, corrossion, and computer science to solve the engineering problems.
Arjuna Subject : -
Articles 225 Documents
CHANGES ON THE PHYSICAL-CHEMICAL PROPERTIES OF KUE DELAPAN JAM ON VARIOUS STEAMING TIME Agustini, Sri
International Journal of Science and Engineering Vol 7, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (123.828 KB) | DOI: 10.12777/ijse.7.2.161-165

Abstract

This research intended to study browning reaction between glucose, fructose, and lipids with amino acids in real system during making Kue Delapan Jam. Research applied completely randomized design with steaming time as treatment ( 2, 4, 6, and 8 hours) with 3 replication. The development of color and browning index were ivestigated by using lightness, redness, yellowness, and total color difference (TCD) during reaction,  and the absorbance of methanol extracts was measured at 420 nm in 40.0 mm silica. The development of texture was monitored by using Bookfield texture analyzer. Test results showed that steaming time influenced the color, browning index, texture, protein, and fat content of the cake significantly.  Steaming time has no effect on water content. There were positive correlation between steaming time with TDC, redness,  texture, and browning index during course. While for lightness, yellowness, pH, protein, and fat content indicated negative correlation. Changes on texture, TDC, browning index, protein, and fat content followed linear model.
SIMULATION OF TRAFFIC FLOW MODEL WITH TRAFFIC CONTROLLER BOUNDARY Sultana, Nahid; Parvin, Masuma; Sarker, Ronobir; Andallah, Laek Sazzad
International Journal of Science and Engineering Vol 5, No 1 (2013)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.526 KB) | DOI: 10.12777/ijse.5.1.25-30

Abstract

This paper considers a fluid dynamic traffic flow model appended with a closure linear velocity-density relationship which provides a first order hyperbolic partial differential equation (PDE) and is treated as an initial boundary value problem (IBVP). We consider the boundary value in such a way that one side of highway treat like there is a traffic controller at that point. We present the analytic solution of the traffic flow model as a Cauchy problem. A numerical simulation of the traffic flow model (IBVP) is performed based on a finite difference scheme for the model with two sided boundary conditions and a suitable numerical scheme for this is the Lax-Friedrichs scheme. Solution figure from our scheme indicates a desired result that amplitude and frequency of cars density and velocity reduces as time grows. Also at traffic controller point, velocity and density values change as desired manner. In further, we also want to introduce anisotropic behavior of cars(to get more realistic picture) which has not been considered here. Doi: 10.12777/ijse.5.1.25-30 [How to cite this article: Sultana, N., Parvin, M. , Sarker, R., Andallah, L.S. (2013). Simulation of Traffic Flow Model with Traffic Controller Boundary. International Journal of Science and Engineering, 5(1),25-30. Doi: 10.12777/ijse.5.1.25-30]
NEW CONCEPT OF CULTIVATION USING LIMITED STRIP-TILLAGE WITH STRIP SHALLOW IRRIGATION Intara, Yazid Ismi; Sapei, A; Erizal, Erizal; E. S, Namaken; Joefrie, M. Bintoro
International Journal of Science and Engineering Vol 6, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (441.106 KB) | DOI: 10.14710/presipitasi.v%vi%i.387-400

Abstract

Dry land is one of land resources which potentially used for food crop cultivation, especially in the areas which have light to medium technical obstacles. The development of technology to improve soil quality in marginal lands to be productive lands is still widely open for agricultural development in Indonesia. Rooting medium quality can be improved by changing soil tillage method and observing the proper crop irrigation technology. It can be the solution for crop cultivation in clay loam soil. This study aimed to obtain water movement model in a minimally-tilled clay soil with strip shallow irrigation. The concept is limited soil-tillage with strip shallow irrigation method, water supply technique, and crop water requirement. Method used in this study includes developing water movement model (software development) in a minimally-tilled clay soil with subsurface irrigation. In the final stages, research also conducted water movement analysis testing apparatus in the laboratory, field validation of the subsurface irrigation performance, and cultivation technique testing to chili pepper growth (Capsicum annuumL.). The development of water movement simulation on a limited strip-tillage with subsurface irrigation uses the concept to quantify the amount of water in the soil. The analysis of movement pattern was demonstrated on contour patterns. It showed that the wetting process can reach depth zone ? 5 cm to the rooting zone. It was an important discovery on the development of minimum stripe tillage soil with subsurface irrigation. Specifically, it can be concluded that: the result of fitting by eyes to diffusivity graphic and water content obtained the required parameter values for soil physical properties. It was then simulated on horizontal water movement model on a minimum strip-tillage with strip shallow irrigation
EXPERIMENTAL AND NUMERICAL STUDY OF SNUBER IN HYDROGEN COMPRESSOR Rahman, M. Shiddiqur
International Journal of Science and Engineering Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.235 KB) | DOI: 10.12777/ijse.3.2.21-25

Abstract

In hydrogen production, transportation and delivery system, compression is one of the most important issues. There develop inherently pressure pulsation in reciprocating hydrogen compressing system. An experiment has been conducted to investigate the performance of snubber as pulsation damper used in reciprocating compression system. CFD analysis is applied to get the pressure values at different parts of this snubber. Regression equations are also developed for amplitude at input and output of the snubber. A comparative study of pressure and amplitude by experiment, regression equation and CFD model are performed for 35, 40 and 45 Hz motor frequency. These models results are varied by 3.975%, 3.516% and 3.787% from the experiment for those motor frequencies. The pressure losses in the snubber are also found almost similar values by the regression equation i.e. 0.026%, 0.033% and 0.018% deviations.
A TECHNICAL APPROACH ON LARGE DATA DISTRIBUTED OVER A NETWORK G, Suhasini; Billa, Mamtha; P, Ashwini
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (126.677 KB) | DOI: 10.12777/ijse.2.2.34-41

Abstract

Data mining is nontrivial extraction of implicit, previously unknown and potential useful information from the data. For a database with number of records and for a set of classes such that each record belongs to one of the given classes, the problem of classification is to decide the class to which the given record belongs. The classification problem is also to generate a model for each class from given data set. We are going to make use of supervised classification in which we have training dataset of record, and for each record the class to which it belongs is known. There are many approaches to supervised classification. Decision tree is attractive in data mining environment as they represent rules. Rules can readily expressed in natural languages and they can be even mapped o database access languages. Now a days classification based on decision trees is one of the important problems in data mining   which has applications in many areas.  Now a days database system have become highly distributed, and we are using many paradigms. we consider the problem of inducing decision trees in a large distributed network of highly distributed databases. The classification based on decision tree can be done on the existence of distributed databases in healthcare and in bioinformatics, human computer interaction and by the view that these databases are soon to contain large amounts of data, characterized by its high dimensionality. Current decision tree algorithms would require high communication bandwidth, memory, and they are less efficient and scalability reduces when executed on such large volume of data. So there are some approaches being developed to improve the scalability and even approaches to analyse the data distributed over a network.[keywords: Data mining, Decision tree, decision tree induction, distributed data, classification]
UTILIZATION OF GENCIL MOBILE APPLICATION IN IMPLEMENTING SMART CITY IN PONTIANAK Jannah, Hidana Nur
International Journal of Science and Engineering Vol 13, No 1 (2019)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1582.278 KB) | DOI: 10.12777/ijse.13.1.%p

Abstract

Gencil is a mobile application developed in Pontianak to support the implementation of smart city. The aims of this study are; 1)describing the Gencil mobile application, 2)identifying the utilization of Gencil mobile application, 3)identifying the constraining factors in the development of Gencil mobile application in Pontianak. Primary data was obtained through in-depth interviews and questionnaires. The results show that Gencil mobile application consists of six features. The food price feature becomes the most popular one. Constraining factors for the development of Gencil mobile application are the lack of community participation and the inadequate infrastructure for the application?s development
LIST OF CONTENT, EDITORIAL BOARD, PREFACE support, editor
International Journal of Science and Engineering Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (94.802 KB) | DOI: 10.12777/ijse.3.2.i-iv

Abstract

List of Content, Editorial Board, Preface
PITTING CORROSION OF NI3(SI,TI)+2CR INTERMETALLIC COMPOUND AT VARIOUS CHLORIDE CONCENTRATIONS Priyotomo, Gadang; Sebleku, Pius; Kaneno, Yasuyuki
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (845.976 KB) | DOI: 10.12777/ijse.7.1.10-15

Abstract

The pitting corrosion of Ni3(Si,Ti) with 2 at% Cr containing two regions of a Ni3(Si,Ti) single-phase of L12 structure and a mixture phase of of (L12 +Niss) was investigated as function of chloride concentrations by using a polarization method, scanning electron microscope and energy dispersive X-Ray spectroscopy in neutral sodium chloride solutions at 293 K.  The pitting corrosion of Ni3(Si,Ti) with and without the addition of aluminium and type C276 alloy were also studied under the same experimental condition for the comparison.  The pitting potential obtained for the Ni3(Si,Ti) with 2 at% Cr decreased with increasing chloride concentration.  The specific pitting potentials and the pitting potentials were decreased in the order of C276 alloy > Ni3(Si,Ti) > Ni3(Si,Ti) + 2Cr > Ni3(Si,Ti) + 4Al, which means that the pitting corrosion resistance of Ni3(Si,Ti) with 2 at% Cr was higher than Ni3(Si,Ti) with 4 at% Al, but lower than that of Ni3(Si,Ti).  A critical chloride concentration of Ni3(Si,Ti) with 2 at% Cr was found to be higher than that of Ni3(Si,Ti) with at% Al. In addition, the presence of high concentration for oxygen indicates the occurrence of pit formation.
SUBMISSION INFORMATION support, editor
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (42.482 KB) | DOI: 10.12777/ijse.2.2.57

Abstract

Submission Information
CORROSION BEHAVIOR OF NI3(SI,TI) + 2MO IN HYDROCHLORIC ACID SOLUTION Priyotomo, Gadang; Sebleku, Pius
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1574.546 KB) | DOI: 10.12777/ijse.6.1.39-42

Abstract

The corrosion behavior of Ni3(Si,Ti) + 2Mo intermetallic compound (L12 and (L12 + Niss) mixture region) has been investigated using an immersion test, polarization method and surface analytical method (scanning electron microscope and energy-dispersive X-Ray spectrometry) in 0.5 kmol/m3 hydrochloric acid (HCl) solution at 303 K.  In addition, the results obtained were compared to those of the L12 single-phase Ni3(Si,Ti) intermetallic compound and C 276 alloy.  It was found that Ni3(Si,Ti) + 2Mo had the preferential dissolution of L12 with a lower Mo concentration compared to (L12 + Niss) mixture region.  From the immersion test and polarization curves, Ni3(Si,Ti) + 2Mo and C276 showed the lowest corrosion resistance and the highest corrosion resistance in the solution, respectively.  From this work, It implied that unlike C276, Ni3(Si,Ti) +2Mo intermetallic compound was difficult to form a stable passive film in HCl solution as well as Ni3(Si,Ti) in the same solution.

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