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International Journal of Science and Engineering (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.

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Articles 16 Documents

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Search results for , issue "Vol 7, No 1 (2014)" : 16 Documents clear

Environmental Impact Assessment of a Flood Control Channel in Sfax City, Tunisia Noura Dahri; Abdelfattah Atoui; Habib Abida
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The objective of this study is to evaluate water and sediment quality in the southern branch of a flood control channel in Sfax city, as well as its neighboring sites. This artificial channel, located 4km away from downtown Sfax, was implemented in 1984 to protect the city against floods. Even though it contributed to reduce the harmful flood effects, this channel also resulted in new environmental problems that may cause a public health threat. Indeed, artificial surfaces pose a greater risk of infection due to bacteria, fungi and other microorganisms. A total of 19 water samples (9 from the channel and 10 from groundwater wells) were collected in a dry period and analyzed in the laboratory. Furthermore, 12 sediment samples were taken from the bottom of the channel. Water quality data were used to examine the spatial variability of the different water quality parametrs. The resultant maps revealed an important contamination and illustrated that the degree of contamination differs from one site to another, depending on the distance from the pollution source (industrial, domestic or agricultural activity), the depth of the groundwater table and also the maintenance of the well and its surroundings.

Condition and The Affecting Factors of Tanjung Jumlai Patch Reef in North Penajam Paser Regency East Kalimantan Muchlis Efendi; Sahat Hutahaean; Anugrah A Budiarsa; T Hanjoko
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Patch reef of Tanjung Jumlai which located in North Penajam Paser Regency, East Kalimantan Province has being suffered from stress and degradation, less studied and managed. Thus, this research was conducted to obtain data concerning on the reef condition and the affecting factors. The research was carried out from December 10 – 14, 2013. There were eight observation stations that surveyed using life form line intercept transect method to obtain data related with coral reef condition based on percent cover of live coral (LC) and coral mortality index (MI). The result showed that the lowest LC was 5% at ST 7 (poor/bad coral condition) and the highest LC was 78% (excellent condition), and the average LC was 42.5% (fair/moderate condition). The average coral mortality index was 0.34 with the lowest MI was 0.06 at ST 6 and the highest MI was 0.78 at ST 7. This study also found that anthropogenic factors (mainly from Balikpapan Bay) were more influential toward the reef condition of Tanjung Jumlai patch reef rather than non-anthropogenic factors.

Plants Growth Rate in Evapotranspiration continuous system reactors as the 2nd Treatment at Anaerobic-evapotranspiration system with High Strength Ammonium in Leachate Influent Badrus Zaman; Purwanto Purwanto; Sarwoko Mangkoedihardjo
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Ammonium is one of parameter which responsible to leachate toxicity. Preliminary research was shown that the Fimbristylis globulosa (water plant), Alocasia macrorrhiza (terrestrial plant) and Eleusine indica (terrestrial grass) were potential plants for used as object in evaporation reactor system with high strength ammonium concentration in leachate treatment. This research was integrated of anaerobic system with evapotranspiration system with continuous influent using ammonium concentration in leachate was 2000 mg/l NH4-N. Plants growth rate was analyzed for 25 days operated. The result shown that average of thallus growth rate of Fimbristylis globulosa was 17,5 cm d-1. The average of leaf and thallus growth rate of Alocasia macrorrhiza was 18,1 cm d-1 and 3,2 cm d-1 respectively. The average of blade and thallus of Eleusine indica were same that was 4,7 cm d-1.This research conclude that integration system of anaerobic and evpotranspiration was be potential used for high strength ammonium in leachate treatment.

Physico-Chemical Characterization Of Maluku Nutmeg Oil Ilyas Marzuki; Bintoro Joefrie; Sandra A. Aziz; Herdhata Agusta; Memen Surahman
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The essential oil of Banda nutmeg was extracted using hydro-distillation method to characterize their essential oil and volatile components. Banda, Ambon, and Luhu nutmegs were chosen as sample ecotypes. Nutmeg oils were subjected to physico-chemical and GC-MC analyses. Results indicated that nutmeg from the three ecotypes produced uncolored oils with the contents in mature seed were 11.69, 11.92, and 9.99%, respectively. Meanwhile those of immature seeds contained 13.32, 11.99, and 11.03% respectively. Furthermore, the physico-chemical of the oil are specific gravity 0.897 to 0.909 g/ml; refraction index, 1.489 to 1.491; and optical rotation, +11.40 to +16,30.GC-MS analysis suggested that essential oils Maluku nutmegs composed of 28 to 31 components and also showed that nutmeg from Banda comprised 52.8% monoterpene hydrocarbon (MH), 21.11% oxygenated monoterpene (OM), and 18,04% aromatic compound (AC); Ambon’s 45.12% MH, 24.51% OM, and 16.97% AC; and Luhu’s 56.06% MH, 27.34% OM, and 13.62% AC. Further analysis indicated that there were four important volatile oils fractions in nutmegs i.e. myristicin, elemicin, safrole, and eugenol. Maluku nutmeg contain 5.57 to 13.76% myristicin and 0.97 to 2.46% safrole. In conclusion, nutmeg oil shows a high stability in all physico-chemical properties. Nutmeg from Banda ecotype has the highest content in myristicin.

Pitting Corrosion of Ni3(Si,Ti)+2Cr Intermetallic Compound at Various Chloride Concentrations Gadang Priyotomo; Pius Sebleku; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

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.

IMPLEMENTATION OF DEMONSTRATION PLOTS DME NYAMPLUNG (Calophyllum inophyllum L) IN BULUAGUNG AND PATUTREJO VILLAGES Bambang Uripno; Lala m. Kolopaking; R. Margono Slamet; Siti Amanah
International Journal of Science and Engineering Vol 7, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

The purpose of this study were to evaluate the condition of the frist demplot DME nyamplung. Energy self sufficient village program aims to improve stock and diverse energy source and society economic opportunity. Nyamplung is very potential plant to be used as raw material of biofuel, because it has very high fat plant content and has not be used for food. The biofuel from nyamplung is a new innovation. Involvement of forest village community in biofuel industry development both as producers and as consumers is very important. Forestry Ministry has established demonstration plots in Buluagung and Patutrejo villages as a facilitation in developing biofuel nyamplung silvoindustry. Up to now, the demplots still faces some problems. The researh method was qualitatif analysis. Collecting data from 62 respondents using purposive sampling. Data were collected using questionnaires, field obsevation, and in-depth interview. Focus group discussion was used to confirm the data from the respondents. Research results show that the demplots have not been developed through participatory approach. Involvement of community to demplots activity is low. Involvement of the village communities are significantly correlated to biofuel price, technology innovation, role of demplot and support from local leaders.

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