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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 11 Documents
Search results for , issue " Vol 3, No 2 (2012)" : 11 Documents clear
Strategy of Quality Improvement of Pond Shrimp Post Harvest Management (Penaeus monodon Fabricius) in Mahakam Delta (Case Study) Noor Asikin, Andi; Hutabarat, S.; Darmanto, Y. S.; Prayitno, S. B.
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

Mahakam Delta area, which is situated in Kutai Kartanegara Regency, has become a pond center that gives a significant contribution to shrimp export of East Kalimantan Province. Pond-produced shrimps, however, do not always accord to the intention of cold storage companies at expected price. The companies even sometimes reject the request due to poor quality of the product. The decreasing shrimp quality may be due to maintenance process by the pond farmers as well as the improper collectors. In the other hand, importing countries have decided more and more restricted requirements for the imported fishing products. This study was held in Muara Jawa, Anggana, and Muara Badak Districts using techniques of data collection of in-depth interview with twelve respondents. In order to improve shrimp quality, farmers or the producers have to formulate a strategy towards the improvement of the post harvest shrimps from the pond using an Analytical Hierarchy Process (AHP). Results of the AHP consist of as follows: (1) application of pond shrimp post harvest technology and improvement of facilities and accommodation that support the quality improvement of the pond shrimps, (2) human resource quality improvement of pond farmers, collectors, and field instructors, (3) development of pond culture by applying best practices principle and local policies in order to improve the quality of the pond shrimps, and (4) improvement of interagency coordination, monitoring, and evaluation to enhance the pond shrimp quality
Drying Spirulina with Foam Mat Drying at Medium Temperature Prasetyaningrum, Aji; Djaeni, Mohamad
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

Spirulina is a single cell blue green microalgae (Cyanobacteria) containing many Phytonutrients (Beta-carotene, Chlorophyl, Xanthophyl, Phyocianin) using as anti-carcinogen in food. Producing dry spirulina by quick drying process at medium temperature is very important to retain the Phytonutrient quality. Currently, the work is still challenging due to the gel formation that block the water diffusion from inside to the surface.  This research studies the performance of foam-mat drying on production of dry spirulina. In this method the spirulina was mixed with foaming agent (glair/egg albumen, popular as white egg) at 2.5% by weight at air velocity 2.2 m/sec. Here, the effect of spirulina thickness and operational temperature on drying time and quality (Beta-carotene and color) were observed. The drying time was estimated based on the measurement of water content in spirulina versus time. Result showed that the thicker spirulina, the longer drying time. Conversely, the higher operational temperature, faster drying time. At thickness ranging 1-3 mm and operational temperature below 70oC, the quality of spirulina can fit the market requirement
Forecasting Volatility of Dhaka Stock Exchange: Linear Vs Non-linear models Islam, Masudul; Ali, Lasker Ershad; Afroz, Nahida
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

Prior information about a financial market is very essential for investor to invest money on parches share from the stock market which can strengthen the economy. The study examines the relative ability of various models to forecast daily stock indexes future volatility. The forecasting models that employed from simple to relatively complex ARCH-class models. It is found that among linear models of stock indexes volatility, the moving average model ranks first using root mean square error, mean absolute percent error, Theil-U and Linex loss function  criteria. We also examine five nonlinear models. These models are ARCH, GARCH, EGARCH, TGARCH and restricted GARCH models. We find that nonlinear models failed to dominate linear models utilizing different error measurement criteria and moving average model appears to be the best. Then we forecast the next two months future stock index price volatility by the best (moving average) model.
Growth With of Alfalfa Mutant in Different Nitrogen Fertilizer and Defoliation Intensity Slamet, Widyati; Sumarsono, S.; Anwar, S.; Widjajanto, D.W.
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

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]
Essential Oil Extraction of Fennel Seed (Foeniculum vulgare) Using Steam Distillation Damayanti, Astrilia; Setyawan, Eko
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

Indonesia is a potential country in developing essential oils which is each part of the plants produce essential oils such as leaf, seed, fruit, and root. One of the potential plants is fennel. Fennel oil distillation used fennel seed from Cepogo District, Boyolali Regency. The characteristics of the seed are; the color is black and the length is 0,2 centimeters. The condition operation to exctract of the fennel seed are 1 atm and 7,5 hours. The calculation of the time started when the first fennel oil dropped into the decanter. It finished when the fennel oil was not dropped anymore. The color is bright and muddy. The last process is add 1% (m/m) Na2SO4 anhidrous into fennel oil to absorp remain water in it. The distillation process produce fennel oil102,125 grams. Sample of fennel oil tested which are density test, solubility on 90% alcohol, GC-MS test, and AAS test. The result shows that fennel oil from the fennel seed is 2,0425%. The tested samples contain the brightest and the muddies sample. The density of 0,9500 and 0,949 g/cc respectively that is not fulfill to  the Food Chemical Codex (FCC). Samples solubility in 90% alcohol (1:3) is fulfill to the the Food Chemical Codex (FCC).  Three main components of the brightest sample are anethole (47,51%), estragole (22,41%), and  α-fensone (21,92%) while the muddiest sample’s components are anethole (52,38%), estragole (21,37%),and α-fensone (15,74%). The AAS test shows that fennel oil contains 65,1473 ppm which does not fulfill the Indonesian National Standards of  patchouli and clove leaf oil. [Keywords— essential oil; extraction; fennel seed; steam distillation
Experimental and Numerical Study of Snuber in Hydrogen Compressor Rahman, M. Shiddiqur
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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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.
The Effect of Chrysonilia crassa Additive on Duodenal & Caecal Morphology, Bacterial & Fungal Number, and Productivity of Ayam Kampung Yudiarti, Turrini; Yunianto B.I, V. D.; Murwani, R.; Kusdiyantini, E.
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

Fungi is a microorganism that can live in gastrointestinal tract of chicken. One type of fungi is multicellular or filamentous fungi. C.crassa is a species of filamentous fungi that has been isolated in the earlier study and it showed the best probiotic potency in vitro. The obyective of this research was to study the effect of addition of dried culture of  C.crassa in feed on intestinal & caecal morphology, bacterial & fungal number, and  productivity of indigenous chicken (ayam kampung). Research used completely randomized design with four treatments. The treatments were the level of  dried culture in basal diet (0%, 0.25 %,  0.50 % and 0.75 %). Each treatment was replicated 5 times and each replicate consists of 10 chickens. The parameters observed were : villi morphology, number of bacteria and fungi in the duodenum and cecum of chickens aged 1, 21 and 35 days and productivity i.e. feed intake, final body weight and feed conversion. The results showed that 0.50% dried culture of C.crassa could increase the duodenal villi width, decreased the number of bacterial and fungal colonies in duodenum and caecum, but it did not increase productivity. The conclusion : C.crassa could stimulate the duodenal villi development and decreased the number of the bacteria and fungi in the gastrointestinal tract, yet it has no positive impact on the chicken productivity.
Bioaccumulation of Pb and Cd on Broiler Chicken Fed in Difference Diets Dwiloka, Bambang; Atmomarsono, U.; Priyo Bintoro, V.; Widianarko, B.
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

The study was aimed to compute Pb and Cd bioaccumulation in different organs of broiler. Carcass, heart, liver, gizzard, intestine, and excreta. The data were obtained from broiler reared in the litter cage. Four treatments of feed were given to the broiler chicken, i.e.  T1 = X brand of commercial feed, T2 = Y brand of commercial feed, T3 = self-prepared feed without fish meal addition and T4 = self prepared feed without fish meal but contaminated with cadmium chloride (Cd.Cl2.4H2O). For each treatment, five broiler chicken were grouped each week (from week I up to week VI). Results of the first stage of this study was analyzed descriptively. A polinomial regression equation was used as an empirical model to describe the heavy metal bioaccumulation phenomenon in broiler carcasses. The quadratic equation  turned out to be the most suitable model for describing the bioaccumulation of heavy metal in broiler carcasses. From the simulation, it was found that  quadratic model fit to 61.31% and 54.17%  bioaccumulation data of Pb and Cd respectively. According to the model, initially metal concentrations declined since the first week and started to rebound at the fifth week, both in terms of chronological and physiological age. The patterns of Pb and Cd bioaccumulation in this study can be used as a reference to determine the proper slaughter period. It can be concluded that for reducing the risk of metal contamination the proper slaughter time of the broiler is before the fifth week.
List of Content, Editorial Board, Preface support, editor
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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List of Content, Editorial Board, Preface
The Effect of Fe Concentration on the Quality and Quantity of Biogas Produced From Fermentation of Palm Oil Mill Effluent Matseh, Irvan
International Journal of Science and Engineering (IJSE) Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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Abstract

The purpose of this research is to study the effect of Fe concentration as a trace metal on the quality and quantity of biogas produced from the fermentation of palm oil mill effluent (POME). Raw POME as feed was obtained from one of the palm oil mills belong to PTPN IV, other materials used were hydrochloric acid, sodium bicarbonate, and trace metals. Observed variables were volume of biogas, concentration of Fe in raw POME and biodigester, degradation rate of total solid (TS) and volatile solid (VS), M-Alkalinity, pH, H2S and CO2 concentration in biogas at hydraulic retention time (HRT) 6 days. Before HRT of 6 days reached, initial trace metal compositions were 25.2 mg/L of Fe, 0.42 mg/L of Co, and 0.49 mg/L of Ni. After that, composition of trace metal were consisted only Co and Ni. The results showed that Fe as a trace metal did not affect the production or quantity of biogas. When Fe concentration reached over to 330 mg/L then concentration of CH4, total solid (TS) and volatile solid (VS) decreased. Moreover, the higher the Fe contents the smaller of H2S production. Fe content in POME from the same mill had different concentration, as the consequence biogas with different H2S concentrations were produced as well. Thus, Fe in the trace metals is no longer required if high concentration of Fe already existed in POME because it can reduce the formation of H2S. In addition, too high concentration of Fe in POME can be toxic for microorganism in the fermentation of biogas.

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