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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.
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Articles 15 Documents
Search results for , issue "Vol 7, No 2 (2014)" : 15 Documents clear
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.
Taro Tube Flour Modification via Hydrogen Peroxide Oxidation Budiyati, Catarina Sri; Ariyanti, Dessy
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 (6394.485 KB) | DOI: 10.12777/ijse.7.2.137-142

Abstract

Colocasia esculentum (L) Schott known as “Talas bogor” in Indonesian language is easily grown in every island in Indonesia. It proved to have high content of carbohydrate as it can be utilize for wheat flour replacement in addition to prior modification using hydrogen peroxide. The objective of this research was to improve the quality of taro flour by assessing the effect of several parameter such as ratio of slurry, oxidation agent concentration, oxidation time and temperature. The result shows that using ratio of slurry 20% with 2% of H2O2 concentration in temperature of oxidation process 30oC and 60 min operation time can produced good quality of modified taro tube flour in terms of swelling power and water solubility with 7.2 g/g and 6.93% respectively. This condition has chosen by taking the technical and economic feasibility as consideration. This result also can be used as proof of evidence that using H2O2 as an oxidizing agent in the process of taro tube flour modification can improve the functional properties of the flour. As the swelling power and water solubility of original taro tube flour were 3.7 g/g and 1.8% respectively.
Aims and Scopes, Editorial Boards, Preface, Table of Contents Support, Editor
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 (63.853 KB) | DOI: 10.12777/ijse.7.2.i - iv

Abstract

Aims and Scopes, Editorial Boards, Prefce, Table of Contents
Drying of Rosella (Hibiscus sabdariffa) Flower Petals using Solar Dryer with Double Glass Cover Collector Marnoto, Tjukup
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 (409.038 KB) | DOI: 10.12777/ijse.7.2.150-154

Abstract

Chemical ingredients in rosella petals are very beneficial for health. Rosella petals needed to be drained for storage and packing purpose. The traditional drying takes 5 days and less healthy. Solar dryer technology can speed up the drying process and protect materials from dust contamination. Solar dryer with double glass covered collector has been designed and made for drying of agricultural products such as rosella flowers. Rosella petals as much as 2300 grams with initial moisture content of 90.84 % be dried with this dryer until the moisture content of 7.67 % takes only 2 days, although the weather was less sunny . The temperature in the drying chamber was not more than 50° C, so it was good for drying groceries, not damaging chemical ingredients. The relative humidity in the space dryeris was about 40 % and it was still relative low. Drying rate and drying performance was expressed by the efficiency and Specific Moisture Evaporation Rate ( SMER ) were influenced by water content of the dried material and weather. Daily efficiency at the first and the second day: 14.931 % and 5.78%, while the daily SMER on the first and the second day: 0.222 and 0.0256 ( kg / kWh ).
INVESTIGATION ON THE EFFECT OF SHAPES ON THE DRYING KINETICS AND SENSORY EVALUATION STUDY OF DRIED JACKFRUIT Gan, Pek Li; Poh, Phaik Eong
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 (15.639 KB) | DOI: 10.12777/ijse.7.2.193-198

Abstract

Jackfruits are seasonal and highly nutritional fruits indigenous to the Southwestern rainforests of India. However much of the produce are spoilt annually due to poor preservation techniques. Minimal studies have been conducted on the drying kinetics of jackfruit and the effect of shapes on the drying kinetics. In this research, drying curves of three different shaped jackfruit slices were obtained using a convective oven at 40oC, 50oC, 60oC and 70oC. Modified Midilli-Kucuk Model was found to be the best kinetic model for drying of jackfruits. At all temperatures, effective moisture diffusivity values and activation energy varied from 2.66 x 10-10 - 4.85 x 10-10 m2/s and 16.08 - 20.07 kJ/mol respectively. Drying was found to be most efficient at 50oC using the square shaped slices with a R2, RMSE and SSE value of 0.9984, 0.01127 and 0.002668 respectively.  Sensory evaluation of untreated and additive-added dried jackfruit slices was conducted by 40 untrained sensory panelists. Jackfruit with ascorbic acid and sugar coating had highest aesthetics value due to better retention of colour by ascorbic acid. However sugar coated jackfruit had the most favorable taste and smell. Further optimization must be done to satisfy consumers collectively to enable a highly marketable product.
Synthesis Biodiesel from Palm Oil Through Interesterification Using Imobilized Lipase Enzym as Catalyst: The Effect of Amount of Biocatalyst, Mole Ratio of Reactan, Temperature to Yield Widyawati, Melina; Manurung, Renita; Afrianto, Ricky
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 (270.409 KB) | DOI: 10.12777/ijse.7.2.174-177

Abstract

Biodiesel usually synthesized by transesterification of triglyceride and alcohol by addition of acid or base catalyst so there is could produce a waste of chemical process. Alternative process is by using biocatalyst such as enzyme to synthesize biodiesel without chemical process waste. In this research, synthesis of biodiesel from Crude Palm Oil (CPO) that through the process of degumming and methyl acetate as acyl donor has been investigated with using Lipozyme as biocatalyst. Variables in this research are amount of biocatalyst, mole ratio of reactant, and temperature, and its respond to the yield conversion of biodiesel that presented by using Response Surface Methodology (RSM). Yield raging from 15% - 68% were achived during 10 hours reaction time. The results showed that the most influential variable is amount of biocatalyst.
The Nutrient Digestibility of Locally Sheep Fed with Amofer Palm Oil Byproduct-Based Complete Feed Mayulu, Hamdi
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 (265.387 KB) | DOI: 10.12777/ijse.7.2.106-112

Abstract

Utilization of palm oil by-product such as palm fronds, leaves, empty fruit bunches (EFB), fiber fruit juice (FFJ), palm kernel cake (PKC), and palm oil sludge (POS) as the source of energy and protein for ruminants, especially sheep is an efficient effort to make a new opportunities in term of economical and beneficial product that will reduce environmental pollution. The objectives of this research were to analyze the effect of palm oil’s byproduct-based complete feed on sheep’s nutrient digestibility. Sixteen male sheeps of nine month old with average body weight 14.69+0.82 kg were used. The complete feed was formulated by ammoniated-fermented technology from palm fronds and leaves, EFB and FFJ, also Centrosema sp., PKC, POS, ground corn, rice bran, cassava, molasses, urea, mineral mix and salt. The complete feed with different levels of crude protein (CP) and TDN were used in this research which consisted of T1=10,63% CP; 63.46% TDN; T2=12.27% CP; 62.38% TDN; T3=13.70% CP; 64.11% TDN; and T4=15.90% CP; 61.28% TDN. The study used a completely randomized design (CRD) which consisted of four treatments and four replications. Data was analyzed using ANOVA with significance level at 95% and followed by Duncan Multiple Range Test. The experimental results showed that the protein level affected the feed digestibility. The highest digestibility of dry matter, organic matter and crude protein were 65.79%, 70.30%, and 84.34% respectively, resulting in 14% protein level (T3) were significantly different with treatment at protein level 10% (T1), 12% (T2) and 16% (T4) at p <0.05. It can be concluded that by-product of palm oil plantation and mill had good nutritional value. Therefore, this feedstuff can be used to formulate complete feed for sheep and it successfully increased the nutrient digestibility
THE EFFECT OF Fe-ENRICH PHASE ON THE PITTING CORROSION RESISTANCE OF Al ALLOY IN VARIOUS NEUTRAL SODIUM CHLORIDE SOLUTIONS Priyotomo, Gadang; Gede Putrayasa Astawa, I Nyoman
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 (1461.955 KB) | DOI: 10.12777/ijse.7.2.143-149

Abstract

The pitting corrosion of 5052 alloy was investigated as function of chloride concentrations by using an electrochemical method, scanning electron microscope and energy dispersive X-Ray spectroscopy in neutral sodium chloride solutions at 293 K.  The pitting corrosion of pure Al was also investigated under the same experimental condition for the comparison. The pitting potential obtained for 5052 alloy and pure Al decreased with increasing chloride concentration.  The pitting potential of pure Al is higher than that of 5052 alloy where pitting resistance of pure Al is better than that 5052 alloy.  The linear equation implies that certain pitting potential becomes a relevant parameter for predicting certain chloride ion concentration.  The synergic role of chloride ion and a localized galvanic corrosion between aluminium metal and iron-containing constituent contribute the process of pitting for 5052 alloy.
Soil Erosion Assessment of The Post-Coal Mining Site in Kutai Kartanagera District, East Kalimantan Province Zulkarnain, Zulkarnain
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 (466.365 KB) | DOI: 10.12777/ijse.7.2.130-136

Abstract

Besides of its positive economic impact, mining activity has negative impacts to the sustainability of community development and livelihoods as mining reclamation can’t restore the land condition to its original state. The objective of this study was to determine the main factor that caused soil erosion induced in post-coal mining and defined reclamation activity that caused soil erosion. The observed parameters were site reclamation age of each companies, soil physical properties (density, texture, permeability, organic material and soil structure), rainfall rate, soil chemical properties, land cover and age of re-vegetation, plant cover. Analysis was carried out to determine the magnitude of erosion at each site unit, tolerable erosion and potential erosion level. Adequate reclamation action with good vegetative cover could be seen from erosion magnitude at five year reclamation age i.e. 1.7 ton/ha/ year- which lower than tolerable erosion i.e. 5.4 ton/ha/year. While inadequate reclamation action could be seen from erosion magnitude at nine year age of reclamation i.e. 201.1 ton/ha/year1 which higher than tolerable erosion i.e. 15.1 ton/ha/ year1. The erosion magnitude at the four month of reclamation age was 4.966,3 ton/ha with tolerable erosion was 5.3 ton/ha. The erosion magnitude that occurs in post-mining site was due to soil compaction that lowering soil permeability rate leading to slow growing of cover crop. This condition made the soil wasn’t covered from raindrop and water run-off.  In order to improve the soil condition of post-mining site into productive land, legume cover crop was recommended to be planted.
The Application Modular Floating Pontoon to Support Floods Disaster Evacuation System in Heavy Populated Residential Area Zakki, Ahmad Fauzan; Windyandari, Aulia
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 (690.48 KB) | DOI: 10.12777/ijse.7.2.166-173

Abstract

During floods disaster in the heavy populated residential area, the lack of existing life saving appliances system such as rubber boat and wooden boat were not able to evacuate the disaster victims spontaneously in mass. The condition might be explained since the rubber boat and wooden boat have limited occupant capacity. Based on the conditions, the main objectives of the research are focused on the evaluation of the application of modular floating pontoon as multipurpose floating equipment to support floods disaster evacuation process. The investigation of the modular floating pontoon performance such as hydrostatics characteristics, the equilibrium condition and the intact stability was studied using strip theory and Krylov’s method. Furthermore, the strength analysis of the modular floating pontoon structure was calculated using finite element method. The results show that the modular floating pontoon is reliable to support the evacuation process.

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