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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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Analysis of Erosion Level Using Map Windows Agricultural Non-point Source Pollution (MWAGNPS) on Jeneberang Sub-watershed South Sulawesi Province Ahmad Rifqi Asrib; M. Yanuar J. Purwanto; Sukandi S; E Eriza
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The aims of this study was to obtain information about the level of soil erosion in Jeneberang sub watershed, as well as the impact of land management and information to determine the direction of land management in the watershed. The approach model used is MWAGNPS. MWAGNPS Model is a model of cell-based rainfall events with the main components are topographic maps, land use and soil type. This model is able to determine the source of erosion and the erosion that occurs. Simulation model showed when Jeneberang watershed has 31.66 mm of rain events with 30-minute rainfall intensity (EI30) can caused erosion 44.81 tons / ha and the sedimentation rate is 2,22 tons / ha. The source of erosion in Jeneberang sub watershed from farm/moor caused erosion is 29552.14 tons / ha and a total of 4,562,625.84 tons of sediment.

Synthesis, Structural and Optical studies of SnO2 nanoparticles by Chemical precipitation method N Ganeshan S
International Journal of Science and Engineering Vol 13, No 1 (2019)
Publisher : Chemical Engineering Diponegoro University

Tin Oxide (SnO2) nanoparticles have been prepared by chemical precipitation method. The prepared sample was characterized by X-ray diffraction, SEM with EDAX, UV- Vis absorption and Photoluminescence. From the X-ray diffraction patterns showed that the formation of pure SnO2 with their average crystallite size are 17 nm. The crystalline product shows good morphology with meragre agglomeration by SEM images. Elemental compositions of SnO2 nanoparticles were determined by EDX Spectroscopy. UV – Visible spectrum reveals that the transparency of nanoparticles over entire range. The Photoluminescence spectrum for the prepared samples was also recorded.

Submission Information editor support
International Journal of Science and Engineering Vol 2, No 1 (2011)
Publisher : Chemical Engineering Diponegoro University

Submission Information

Studies on as separation behaviour of polymer blending PI/PES hybrid mixed membrane: Effect of polymer concentration and zeolite loading Ahmad Fauzi Ismail; Tutuk Djoko Kusworo
International Journal of Science and Engineering Vol 6, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

This study is performed primarily to investigate the effect of polymer concentration of polyimide/polyethersulfone (PI/PES) blending on the gas separation performance of hybrid mixed matrix membrane. In this study, PI/ (PES)–zeolite 4A mixed matrix membranes were casted using dry/wet phase inversion technique. The efefct of PI/PES concentrations and zeolite loading on the dope solution were investigated for gas separation performance. The results from the Field Emission Scanning Electron Microscopy (FESEM) analysis confirmed that polymer concentration and zeolite loading was affected the morphology of membrane and gas separation performance. ‘Sieve-in-a-cage’ morphology observed the poor adhesion between polymer and zeolite at higher zeolite loading. The gas separation performance of the mixed matrix membranes were relatively higher compared to that of the neat polymeric membrane.

Growth With of Alfalfa Mutant in Different Nitrogen Fertilizer and Defoliation Intensity Widyati Slamet; S. Sumarsono; S. Anwar; D.W. Widjajanto
International Journal of Science and Engineering Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

The research was conducted to evaluate growth of alfalfa mutan (plant height increment, number of leaves and dry matter production) in different Nitrogen Fertilizer and defoliation intensity. The design used was randomized block design 4x2 factorial with 3 replications. The first was dosage of Nitrogen fertilizerNitrogen (0, 30, 60 and 90 kg N / ha), the second factor was defoliation intensity (5 and 10 cm). Variables observed alfalfa growth (plant height increment, number of leaves, the production of dry matter (DM) forage). The results showed that different N fertilization did not affect the growth of alfalfa mutants. Defoliation intensity affectedmnumber of leaves and DM production of alfalfa mutant. Fertilization to 90 kg N / ha has not affected the growth and defoliation intensity 10 cm gave better growth on alfalfa mutant. [Keywords: alfalfa mutant; Nitrogen fertilizer; defoliation; growth]

THE EFFECT OF Fe-ENRICH PHASE ON THE PITTING CORROSION RESISTANCE OF Al ALLOY IN VARIOUS NEUTRAL SODIUM CHLORIDE SOLUTIONS Gadang Priyotomo; I Nyoman Gede Putrayasa Astawa
International Journal of Science and Engineering Vol 7, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

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.

Experimental Analysis for Factors Affecting the Repeatability of Plastics Injection Molding Tests on the Self-developed Apparatus Yugang Huang; Duxin Li; Yuejun Liu
International Journal of Science and Engineering Vol 5, No 1 (2013)
Publisher : Chemical Engineering Diponegoro University

To improve the repeatability of the injection molding test result, the affecting factors were investigated by means of experiments. Besides the traditional processing parameter, the factors of test conditions were also considered. In order to focus on the molding process rather than the molded part, the curve measurement of the melt pressure at the entrance to the nozzle was used as the output characteristic. Experiments for polypropylene (PP) showed that the injected volume was the key processing parameter. Within the test conditions, the injection number is the most important factor. According to the analysis the operating procedure was improved effectively. Doi: 10.12777/ijse.5.1.6-11 [How to cite this article: Huang, Y., Li, D., Liu, Y. (2013). Experimental Analysis for Factors Affecting the Repeatability of Plastics Injection Molding Tests on the Self-developed Apparatus. International Journal of Science and Engineering, 5(1),6-11. Doi: 10.12777/ijse.5.1.6-11]

Potency of Palm Oil Plantation and Mill Byproduct as Ruminant Feed in Paser Regency, East Kalimantan Hamdi Mayulu; S Sunarso; C. I. Sutrisno; S Sumarsono; M Christiyanto; K. Isharyudono
International Journal of Science and Engineering Vol 5, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

By-product produced from plantation and palm oil mill can be utilized for energy and protein source of ruminant feed. Thus, it still has potency for further exploration. The objective of the research was to investigate the nutrient value of palm oil plantation and mill’s by-product used to formulate ruminant feed. The research located in 66,118.5 ha of palm oil plantation in Paser regency, East Kalimantan province. The research was carried out in palm oil plantation and mill of PTPN XIII comprising productive plants (TM) in +14,000 ha arranged in 9 divisions (afdeling). Measured variables consisted of: 1) dry mass production (mass of midrib every cutting and frond) (kg); 2) Centrosema sp mass production (kg); 3) mass of empty fruit bunches (kg); palm pressed fiber (PPF) (kg), palm kernel cake (PKC) (kg) dan palm oil sludge (POS) (kg); 4) nutrient content analyzed under proximate analysis in accordance with the procedure of Ruminant Feed Nutrient Laboratory, Faculty of Livestock, Diponegoro University. The result showed that total dry matter (DM) production was 14.82 ton/ha/year, consisting: midrib 29.09% (crude protein (CP) 3.16% and crude fiber (CF) 37.85%), frond 10.31% (CP 6.53% dan CF 30.39%), Centrosema sp. 2.48% (CP 22.58% and CF 35.12), EFB 24.31% (CP 7.01% and CF 40.22%), PPF 1.23% (CP 5.56% and CF 50.36%), PKC 1.29% (CP 15.49% and CF10.45) and POS 1.20% (CP 17.86% and CF 45.99%). This could be concluded that palm oil plantation and mill’s by-product was recommended for ruminant feed as it had huge amount and appropriate nutrient contentDoi: 10.12777/ijse.5.2.56-60 [How to cite this article: Mayulu, H., Sunarso, C. I. Sutrisno, Sumarsono, M. Christiyanto, K. Isharyudono. (2013). Potency of Palm Oil Plantation and Mill Byproduct as Ruminant Feed in Paser Regency, East Kalimantan, 5(2),56-60. Doi: 10.12777/ijse.5.2.56-60]

Ergonomics in Work Method to Improve Construction Labor Productivity Tuti Sumarningsih; Mochammad Agung Wibowo; Sri Prabandiyani Retno Wardani
International Journal of Science and Engineering Vol 10, No 1 (2016)
Publisher : Chemical Engineering Diponegoro University

Productivity is an important issue in the construction industry. It is directly related to the construction cost and duration of the work. Construction productivity is influenced by many factors, such as material, equipment and labor. Labor is the most important factor, since labor determines how the work is done. Labor productivity is influenced by the work methods, physical fatigue, work environment, capability, and complexity of the work. To improve labor productivity due to the work method, application of the principle of ergonomics is important to consider. This research was held in Yogyakarta included 10 construction projects and involve 30 labor of brick masonry work, 22 labor of ceramic instalation, and 24 labor of wall painting work. The application of ergonomics principles in the masonry work, plaster work, ceramic installation, and wall painting work show an increase in labor productivity by 28.49%, 16.22%, 21.47%, and 26.18% respectively. Compared with the National Standards of Indonesia (NSI) these productivity per job are higher by 10.34%, 57.89%, 12.72%, and 33.33%.

Application of Activated Carbon Mixed Matrix Membrane for Oxygen Purification Tutuk Djoko Kusworo; Ahmad Fauzi Ismail; Ahmad Mustafa; , Budiyono
International Journal of Science and Engineering Vol 1, No 1 (2010)
Publisher : Chemical Engineering Diponegoro University

This study is performed primarily to investigate the effect of activated carbon on oxygen separation performance of polyethersulfone mixed matrix membrane. In this study, polyethersulfone (PES)-activated carbon (AC) mixed matrix membranes were fabricated using dry/wet technique. This study investigates the effect of polyethersulfone concentration and activated carbon loading on the performance of mixed matrix membrane in terms of permeability and selectivity of O2/N2 gas separation. The fabricated flat sheet mixed matrix membranes were characterized using permeation test, Field Emission Scanning Electron Microscopy (FESEM) analysis and Differential Scanning Calorimetry (DSC). It was found that the activated carbon loading affected the gas separation performance of mixed matrix membrane. PES- 1wt% AC membrane yielded 3.75 of O2/N2 selectivity, however 5 wt% of AC can produced 5 O2/N2 selectivity

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