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International Journal of Science and Engineering (IJSE)

ijse
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Published by Universitas Diponegoro

ISSN : - EISSN : - DOI : -

Core Subject : Engineering,

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

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Editorial (aims and scope, table of content, editorial board, preface) editor support
International Journal of Science and Engineering Vol 3, No 1 (2012)
Publisher : Chemical Engineering Diponegoro University

This section contains aims and scope, table of content, editorial board, and preface

Community Structure of Macrozoobenthos in Mangrove Ecosystem, Kutai National Park, East Kalimantan Anugrah A Budiarsa; Samsul Rizal
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Mangrove forest in Kutai National Park (KNP) is considered as nature-protected ecosystem. This forest ecosystem has high productivity ecosystem roles as feeding source, spawning and conservation area for water organism living in this surrounding area such as fishes, crustacean, mollusk and others. At the mangrove floor, mangrove is a benthic ecosystem that utilizes organic material either produced from mangrove itself or land sedimentation. This research was conducted using quadrant transect method with 10 observation stations. Collected data were identified, summed and analyzed. Community structure was analyzed by determining the diversity index, homogenous index and dominant index. The research showed that Makrozoobenthos found at the research location was 17 species which divided into 12 families and 3 classes. The smallest number was found in Lombok Bay (station number 8) with 6 species. The largest number was found in Perancis Cape (station number 9) with 15 species. The diversity index of community structure ranged from 1,7 to 2,4. This indicated that the community diversity was at moderate level (1,5<N<3) with good homogenous index 0,8-1

Evaluation on Biofilter in Recirculating Integrated Multi-Trophic Aquaculture S. Sumoharjo; Asfie Maidie
International Journal of Science and Engineering Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Integrated multi-trophic aquaculture pays more attention as a bio-integrated food production system that serves as a model of sustainable aquaculture, minimizes waste discharge, increases diversity and yields multiple products. The objectives of this research were to analyze the efficiency of total ammonia nitrogen biofiltration and its effect on carrying capacity of fish rearing units. Pilot-scale bioreactor was designed with eight run-raceways (two meters of each) that assembled in series. Race 1-3 were used to stock silky worm (Tubifex sp) as detrivorous converter, then race 4-8 were used to plant three species of leaf-vegetable as photoautotrophic converters, i.e; spinach (Ipomoea reptana), green mustard (Brassica juncea) and basil (Ocimum basilicum). The three plants were placed in randomized block design based on water flow direction. Mass balance of nutrient analysis, was applied to figure out the efficiency of bio-filtration and its effect on carrying capacity of rearing units. The result of the experiment showed that 86.5 % of total ammonia nitrogen removal was achieved in 32 days of culturing period. This efficiency able to support the carrying capacity of the fish tank up to 25.95 kg/lpm with maximum density was 62.69 kg/m3 of fish biomass productionDoi: http://dx.doi.org/10.12777/ijse.4.2.2013.80-85 [How to cite this article: Sumoharjo, S. and Maidie, A. (2013). Evaluation on Biofilter in Recirculating Integrated Multi-Trophic Aquaculture. International Journal of Science and Engineering, 4(2),80-85. Doi: http://dx.doi.org/10.12777/ijse.4.2.2013.80-85]

Zinc Supplementation Dosage Variations to Metallothionein Protein Level of Rattus Norvegicus Budi Santosa; Hertanto Wahyu Subagyo; Lisyani S; Henna Rya Sunoko
International Journal of Science and Engineering Vol 5, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Zinc is an essential trace element involving in the activity of more than 300 enzymes and proteins of human body. One important role of zinc is to improve metallothionein protein binding heavy metals and functioning as heavy metal detoxification facilities. This research discusses the effect of zinc supplement on the improvement of metallothionein protein level. The in vivo test involving 28 rats categorized in 4 groups was performed. The experiments used randomized post test control group design. The 3 groups were daily supplemented by zinc in th concentration of 0.2 mg, 0.4 mg, and 0.8 mg. Whereas, the last group was let without zinc treatment. As an indicator the metallothionein protein level was checked after three weeks. The data was then evaluated by Anova an Bonferroni test in order to know the signicant of protein level difference among the groups. The result showed that the average of metallothionein protein level improved by increasing zinc suppplement with the 0.95 ±0.20; 1.28 ±0.19; 1.39 ±0.09; 1.91 ±0.3 ng/ml metallothionein per 0, 0,2, 0,4, 0,8.mg zinc added. Based on the ANOVA and Bonferroni test, indicated that the improvement was significant as shown with p value of 0.00

IDENTIFICATION OF Staphylococcus sp. STRAINS ISOLATED FROM POSITIVE WIDAL BLOOD BASED ON 16S rRNA GENE SEQUENCES Sri Darmawati
International Journal of Science and Engineering Vol 9, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

The purpose of this study is to identify 8 strains of Staphylococcus genus members isolated from positive Widal blood (4 strains of Staphylococcus saprophyticus, 1 strain of Staphylococcus warneri, 2 strains of Staphylococcus hominis, 1 strain of Staphylococcus xylosus and 1 strain of Staphylococcus capitis) based on 16S rRNA gene sequences. The methods used in this study are conducting PCR of 16S rRNA gene, cloning genes using T-Vector pMD20 which is transformed to E. coli DH5α, sequencing. The results show that four strains (BA 47.4, BA 19.2, KD 29.5 and TG 09.1) are identified as Stap. Saprophyticus strains of Stap. saprophyticus members of ATCC 15305T (99.01-100% similarity). The strain of TG 01.3 is identified as Stap. Warneri strain of TG 01.3 of Stap. Warneri members of ATCC 27836T (99.74-99.93% similarity), 2strains (KT 29.2 and KD 35.1) are identified as of Stap. hominis members of DSM 20328T (99.4-99.67% similarity). The strain of KT 30.5 is not identified

Biogas Production Using Anaerobic Biodigester from Cassava Starch Effluent S. Sunarso; B. Budiyono; Siswo Sumardiono
International Journal of Science and Engineering Vol 1, No 2 (2010)
Publisher : Chemical Engineering Diponegoro University

IKMs’ factory activity in Margoyoso produces liquid and solid wastes. The possible alternative was to use the liquid effluent as biogas raw material. This study focuses on the used of urea, ruminant, yeast, microalgae, the treatment of gelled and ungelled feed for biogas production, pH control during biogas production using buffer Na2CO3, and feeding management in the semi-continuous process of biogas production that perform at ambient temperature for 30 days. Ruminant bacteria, yeast, urea, and microalgae was added 10% (v/v), 0.08% (w/v), 0.04% (w/v), 50% (v/v) of mixing solution volume, respectively. The pH of slurry was adjusted with range 6.8-7.2 and was measured daily and corrected when necessary with Na2CO3. The total biogas production was measured daily by the water displacement technique. Biogas production from the ungelling and gelling mixture of cassava starch effluent, yeast, ruminant bacteria, and urea were 726.43 ml/g total solid and 198 ml/g total solid. Biogas production from ungelling mixture without yeast was 58.6 ml/g total solid. Biogas production from ungelling mixture added by microalgae without yeast was 58.72 ml/g total solid and that with yeast was 189 ml/g total solid. Biogas production from ungelling mixture of cassava starch effluent, yeast, ruminant bacteria, and urea in semi-continuous process was 581.15 ml/g total solid. Adding of microalgae as nitrogen source did not give significant effect to biogas production. But adding of yeast as substrate activator was very helpful to accelerate biogas production. The biogas production increased after cassava starch effluent and yeast was added. Requirement of sodium carbonate (Na2CO3) to increase alkalinity or buffering capacity of fermenting solution depends on pH-value

The Effects of Dietary Neutral Detergent Fiber Ratio from Forage and Concentrate on The Dietary Rumen Degradability and Growth Performance of Philippine Native Goats (Capra hircus Linn.) Dwiatmoko Nugroho; Sunarso Sunarso; Cesar C. Sevilla; Amado A. Angeles
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

This research’s objective was to determine the dietary rumen degradability and growth performances of goats fed dietary treatments. 18 native female goats (live weight of 7.96 ± 2.21 kg) were grouped into 6 classes for the feeding trial and 3 male mature goats with rumen cannula were used for the in situ digestibility. The three dietary treatments were: T1 - 72:28 Forage-Concentrate NDF ratio; T2 - 64:36; and T3 - 57:43. The rate of rumen degradability of DM and CP at 0 hours, potentially degradable fraction (b) and the rate of degradation of b were not affected by dietary treatments. The different ratios of NDF in the diets significantly affected the intake of DM, CP and NDF from forage and concentrates. Treatment diets affected the total intake of DM, CP and NDF of the animals. However, growth performance was not affected by the treatments showing the same production efficiency. This means that diets given to native goats with ratio of forage NDF of 72.07% can be applied since the value of the output and efficiency of feed utilization had the same value compared to diets ratio of forage NDF of 57.21%.

Fast Local Binary Patterns for Efficient Face Recognition Mallikarjuna Rao G; Vijaya Kumari G; Babu G R; Rajesh Viswanadula
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

LBP, Local Binary Patterns, is an accepted technique for efficient face recognition. The local features improve the recognition process. However, high memory and computational resources are needed for LBP required approaches to improve the performance. Many people used LBP for extracting features and Support Vector Machine (SVM), histogram matching, neural networks as recognition tools. These approaches consume considerable computational resources. We have proposed a fast LBP which uses Two-level Correlation for the classification & recognition. The exhaustive experiments on FERET database 8750 images substantiate the performance compared to others. [Keywords— Face Recognition, LBP, Histogram Matching, Two-level Correlation, FERET data set]

Immobilized bacteria by using PVA (Polyvinyl alcohol) crosslinked with Sodium sulfate Dinh Van Pham; Leu Tho Bach
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

A new bacteria immobilization technique using PVA (polyvinyl alcohol) crosslink with sodium sulfate was developed. This new technique can simultaneously eliminate the agglomeration of PVA beads and the toxicity of boric acid caused by the PVA-boric methods, also reducing the swelling (when soaking in water) of PVA-boric methods. Beads were immobilized by using four different PVA immobilization processes to create group B, group N, group P and group S. The stability, swelling, relative mechanical strength of these kinds of beads were compared in this study. Only group S was the best and chosen to do experiment for checking survival of bacteria after immobilization process and TOC removal performance of anaerobic reactor. The TOC removal performance of anaerobic reactor achieved 80-87%.

Manufacturing of Electrolyte and Cathode Layers SOFC Using Atmospheric Spraying Method and Its Characterization S. Sulistyo; S. Ariffin; S. Mahzan
International Journal of Science and Engineering Vol 4, No 1 (2013)
Publisher : Chemical Engineering Diponegoro University

The use of Solid Oxide Fuel Cell (SOFC) has created various interest in many parties, due to its capability to convert gases into electricity. The main requirement of SOFC cell components is to be produced as thin as possible to minimize the losses of electrical resistance, as well as able to support internal and external loads. This paper discusses the procedure of making a thin electrolyte layer, as well as a porous thin layer cathode using atmospheric spraying technique. The procedure of spraying was in room temperature with the process of sintering at temperature of 13500 C held for 3 hours. The SOFC characterization of electrolyte and cathode microstructure was determined by using the SEM, FESEM, XRD and impedance spectroscopy, to measure the impedance of SOFC cells. The results show that the thickness of thin layer electrolyte and porous cathode obtained of about 20 µm and 4 µm, respectively. Also the SOFC cell impedance was measured of 2.3726 x 106 Ω at room temperature. The finding also demonstrated that although the materials (anode, cathode and electrolyte) possess different coefficient thermal expansion, there was no evidence of flaking layers which seen the materials remain intact. Thus, the atmospheric spraying method can offer an alternative method to manufacturing of SOFC thin layer electrolyte and cathode. [Key words: SOFC; spraying method; electrolyte; cathode]

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