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International Journal of Science and Engineering (IJSE)

ijse
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Published by Universitas Diponegoro

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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 225 Documents

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

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Potency of Mahakam Delta in East Kalimantan, Indonesia Zairin Zain; Sahala Hutabarat; Slamet Budi Prayitno; Ambaryanto Ambaryanto
International Journal of Science and Engineering Vol 6, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Mahakam Delta is not only utilized for fishery activities but also for several industrial purposes such as coal and oil mining, shipping and timber. The objective of this paper is to provide information in term of the potency of Mahakam Delta located in East Kalimantan province, Indonesia. The study was conducted in Mahakam Delta, East Kalimantan Province, Indonesia. Participatory rural appraisal is a group of methods to collect information in a participatory fashion from rural communities. The method employed in this research was descriptive analysis describing the environmental potency found in Mahakam Delta. Massive conversion of mangrove forest particularly Nypa (Nypa fruticans) area into pond has driven conflict among related stakeholders on the utilization of natural resource and land which subsequently impacts on the fish and shrimp source regeneration, loss of ecological functions of mangrove forest for feeding, nursery and spawning ground of fish and other organisms. Besides of fisheries, oil and gas activity also exists in Mahakam Delta. Mahakam Delta is regarded as important area due to the largest producer of oil and gas mining. Thus, oil and gas industry is the most reliable sector that contributes to the economic development of Kutai Kartanegara district. As a resource provider, Mahakam Delta ecosystem provides various resources for livelihoods. As a life-support service provider, Mahakam Delta ecosystem provides habitat and ideal environment to support variety of living kinds. As a convenience provider, Mahakam Delta ecosystem provides unique and interesting recreation site. As a protector from natural disaster, Mahakam Delta ecosystem is able to protect human kinds from natural disaster threatening coastal area.

Drying Spirulina with Foam Mat Drying at Medium Temperature Aji Prasetyaningrum; Mohamad Djaeni
International Journal of Science and Engineering Vol 3, No 2 (2012)
Publisher : Chemical Engineering Diponegoro University

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

Experimental Design of Electrocoagulation and Magnetic Technology for Enhancing Suspended Solids Removal from Synthetic Wastewater Moh Faiqun Ni'am; Fadil Othman
International Journal of Science and Engineering Vol 7, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Design of experiments (DOE) is one of the statistical method that is used as a tool to enhance and improve experimental quality. The changes to the variables of a process or system is supposed to give the optimal result (response) and quite satisfactory. Experimental design can defined as a test or series of test series by varying the input variables (factors) of a process that can known to cause changes in output (response). This paper presents the results of experimental design of wastewater treatment by electrocoagulation (EC) technique. A combined magnet and electrocoagulation (EC) technology were designed to increase settling velocity and to enhance suspended solid removal efficiencies from wastewater samples. In this experiment, a synthetic wastewater samples were prepared by mixing 700 mg of the milk powder in one litre of water and treated by using an acidic buffer solution. The monopolar iron (Fe) plate anodes and cathodes were employed as electrodes. Direct current was varied in a range of between 0.5 and 1.1 A, and flowrate in a range of between 1.00 to 3.50 mL/s. One permanent magnets namely AlNiCo with a magnetic strength of 0.16T was used in this experiment. The results show that the magnetic field and the flowrate have major influences on suspended solids removal. The efficiency removals of suspended solids, turbidity and COD removal efficiencies at optimum conditions were found to be more than 85%, 95%, and 75%, respectively.

Carcass Characteristics of Growing Male Pig in Different Level of Clenbuterol Addition Wayan Sukarya Dilaga
International Journal of Science and Engineering Vol 5, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

Abstract - Nowadays, pig has becomes an important role in meat supply chain and demand in the world. However, in the intensive maintenance system, raising pig still has problems especially in feed supplements. The investigation on carcass characteristics of growing male pig in different level of clenbuterol addition in feed was conducted. CRD factorial 2 x 3 with 4 repetitions was used in the experiment. The first factor is the nation's pig (L = local pigs & pig off spring K=imports) and the second factor is the level of clenbuterol (T0 = 0 mg/kg feed; T1 = 0.20 mg/kg feed & T2 = 0.40 mg/kg feed). The materials were 24 male grower pigs (12 local & 12 imported pigs) with 52.5 ± 28.27 kg body weight. Pigs were reared in individual cages for 6 weeks consisting 2 weeks for adaptation and 4 weeks for data collection. The pigs were given the same feed consisting of rice bran 27.8%, 55.5% and 16.7% corn concentrate. Feeding pigs was given in appropriate growth phase as much as 2 times a day. Drink provided using ad-libitum method. At the end of the study, the pigs were slaughtered. The meat was then analyzed based on the weight of the cut meat, weight of hot carcass, carcass percentage and carcass components (meat, bones and fat). The data was analyzed in variety followed by various orthogonal polynomial tests. Results shown that there were a real interaction between carcass weight and weight cut with quadratic pattern. Clenbuterol also found out to give an reduction effect on carcass percentage in both local and imported pig. In fact the local pigs give the lower carcass percentage than the imported one. Key Words – clenbuterol; weight cut; carcass percentag; carcass component Doi: 10.12777/ijse.5.2.47-50 [How to cite this article: Dilaga, W.S. (2013). Carcass Characteristics of Growing Male Pig in Different Level of Clenbuterol Addition. International Journal of Science and Engineering, 5(2):9-14. Doi: 10.12777/ijse.5.2.9-14]. Doi: 10.12777/ijse.5.2.47-50

Design of Level Control in A 10 L Pure Capacitive Tank: Stability Analysis and Dynamic Simulation Yulius Deddy Hermawan; Renung Reningtyas; Siti Diyar Kholisoh; Tutik Muji Setyoningrum
International Journal of Science and Engineering Vol 10, No 1 (2016)
Publisher : Chemical Engineering Diponegoro University

The open loop experiment of a 10 L pure capacitive tank has been successfully done in laboratory. The square tank connected with a pump was designed for investigation in laboratory, and the water was chosen as a fluid with its input volumetric rate of fi(t) [cm3/min]. The output volumetric rate of fo(t) can be adjusted by changing the pump voltage of vpu(t) [volt]. The open loop experiment has given the steady state parameters, and it could then be used for calculating the dynamic parameters. This study has proposed the level control configuration of a 10 L pure capacitive tank system; liquid level in the tank h(t) was kept constant by manipulating the pump voltage of vpu(t); and the input water volumetric rate of fi(t) was considered as a disturbance. The P-only-control was implemented to control the level. Purposes of this study are to analyze the stability of the closed loop responses and to do the closed loop dynamic simulation. The closed loop mathematical model was solved analytically with Laplace Transform, and Routh-Hurwitz criterion was chosen to analyze the stability. Since the closed loop model was found in the 2nd order system, the response depended on the value of the damping coefficient (ζ), in which it was really affected by the controller gain (Kc). In order to examine the control configuration, the input water volumetric rate disturbance (with amount of ±14%) was made based on step function. Based on the stability analysis, a stable response would be achieved if the controller gain is negative (Kc<0) and the damping coefficient is positive (ζ>0). Based on the dynamic simulation, the controller gain was recommended in between -117.36 [volt/cm] and -1.17 [volt/cm] and the damping coefficient in between 0 and 1. This study also revealed that by tuning an appropriate controller gain, the fastest and the stable response would be achieved.

Foam Behaviour of An Aqueous Solution of Piperazine- N-Methyldiethanolamine (MDEA) Blend as A Function of The Type of Impurities and Concentrations Iwan Ratman; Tutuk Djoko Kusworo; Ahmad Fauzi Ismail
International Journal of Science and Engineering Vol 1, No 1 (2010)
Publisher : Chemical Engineering Diponegoro University

This study focuses on the effect of impurities in the natural gas stream on the characteristic of foam behaviour in the blended piperazine and MDEA solution. Hydrocarbon liquids, Iron Sulphide, Sodium Chloride, Acetic Acid, Methanol and Polyethylene Glycol were used as the impurities. The results indicated that the type of impurities determined the foam formation of the amine solution. The concentration of piperazine-MDEA blends also enhanced to the increasing of the foam height of blended piperazine-MDEA. Iron sulfide, hydrocarbon and sodium chloride are the impurities which apparently contributed to the high foaming tendency of the solutions. At the same concentration of the impurities, iron sulfide appeared as the most influential contaminant to the foam formation, which promoted the highest foamability in any concentrations of the blend piperazine-MDEA

APPLICATION OF WELL LOG ANALYSIS IN ASSESSMENT OF PETROPHYSICAL PARAMETERS AND RESERVOIR CHARACTERIZATION OF WELLS IN THE “OTH” FIELD, ANAMBRA BASIN, SOUTHERN NIGERIA Eugene URORO; Efe Lucky IGHARO
International Journal of Science and Engineering Vol 8, No 1 (2015)
Publisher : Chemical Engineering Diponegoro University

Over the past years, the Anambra basin one of Nigeria’s inland basins has recorded significant level of hydrocarbon exploration activities. The basin has been confirmed by several authors from source rock analyses to have the potential for generating hydrocarbon. For the hydrocarbon to be exploited, it is imperative to have a thorough understanding of the reservoir. Computer-assisted log analyses were employed to effectively evaluate the petrophysical parameters such as the shale volume (Vsh), total porosity (TP), effective porosity (EP), water saturation (Sw), and hydrocarbon saturation (Sh). Cross-plots of the petrophysical parameters versus depth were illustrated. Five hydrocarbon bearing reservoirs were delineated in well 1, four in well 2. The reservoirs in well 3 do not contain hydrocarbon. The estimated reservoir porosity varies from 10% to 21% while their permeability values range from 20md to 1400md. The porosity and permeability values suggest that reservoirs are good enough to store and also permit free flow of fluid. The volume of shale (0.05% to 0.35%) analysis reveals that the reservoirs range from shaly sand to slightly shaly sand to clean sand reservoir. On the basis of petrophysics data, the reservoirs are interpreted a good quality reservoir rocks which has been confirmed with high effective porosity range between 20% and high hydrocarbon saturation exceeding 55% water saturation in well 1 and well 2. Water saturation 3 is nearly 100% although the reservoir properties are good.

Effect of complete feed starch banana weevil pea stone on the beans goats system in vivo against carcass weight and carcass part A. Aswandi; C. I. Sutrisno; M. Arifin; Joelal Achmadi
International Journal of Science and Engineering Vol 3, No 1 (2012)
Publisher : Chemical Engineering Diponegoro University

The objective of this research is to study the value of benefits in favor of complete feed production performance and carcass weight of any part of the carcass part-goat nuts. The design used in this study. Random Draft Complete. The material used in this study of 12 male goats Nuts averaging initial body weight (15.58 ± 2.601 kg) with a CV: 16.69%, age 10-15 months. At the end of the study 12 goats to know the weight of nuts cut carcass and parts of the carcass. Results of analysis of variance showed that treatment of complete feed on a significantly different (P <0.05) on carcass weight produced goat nuts. Results of analysis of variance showed that treatment of complete feed on a significantly different (P <0.05) against the weight of all the parts ice nuts goat carcass neck, shoulder, breast, leg chump on, ribs, loin, fore shank and the weight of the flank. CF0 and CF3 treatment effects did not provide a very real difference to the weight of carcass parts, but the weight of the carcass are treated CF3 higher than the CF0. This is in line with the expressed [Keywords— banana weevil stone, complete feed goat bean]

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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