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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 5 Documents
Search results for , issue " Vol 10, No 2 (2016)" : 5 Documents clear
The Feed Intake and Daily Weight Gain of Locally Sheep Fed with Amofer Palm Oil Plantation and Mill’s Byproduct-based Complete Feed Mayulu, Hamdi; Suhardi, Suhardi
International Journal of Science and Engineering Vol 10, No 2 (2016)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (224.465 KB) | DOI: 10.12777/ijse.10.2.67-73

Abstract

Livestock development through innovation of complete feed (CF) technology which cheap and potential could be optimized through utilizing palm oil plantation and mill’s by-product. The objective of this research was to analyze the effect of complete feed formulated with palm oil plantation and mill’s by-product to the feed intake and daily weight gain of sheep. Male thin tailed sheep 9 months old with average live weight of 14.69 kg were used in this research. CF was formulated from ammoniated-fermented of palm frond, palm leave, empty fruit bunch, and palm pressed fiber which mixed with Centrosema sp., palm kernel cake, corn, rice bran, dried cassava waste pulp, molasses, mineral mix and salt. The study used completely randomized design which consisted of T1=10%, T2=12%, T3=14% and T4=16% of crude protein and total digestible nutrient (TDN) 64% with 4 repetitions. Data was analyzed using ANOVA at 95% significance level which followed by Duncan Multiple Range Test. The experiment showed that the level of protein content influenced the feed intake. The highest average of dry matter intake, organic matter intake, crude protein intake and TDN were 865.83 g/sheep/day, 750.60 g/sheep/day, 118.66 g/sheep/day and 555.96 g/sheep/day, respectively. The highest average daily weight gain was 174.18 g/sheep/day which produced at crude protein level of 14% (T3). The statistical analysis showed that T3 was significantly different to T1, T2 and T4. It can be concluded that complete feed formulated from palm oil plantation and mill’s by-product with appropriate level of crude protein content could increase the feed intake and daily weight gain of local sheep
Properties of Carbon Black from Jatropha Seed Shell as A Potential Source of Filler Enhancement in Biocomposites Aprilia, N. A. Sri; Khalil, H.P.S. Abdul; Amin, Amri
International Journal of Science and Engineering Vol 10, No 2 (2016)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1888.921 KB) | DOI: 10.12777/ijse.10.2.58-62

Abstract

The use of biomass as filler in biocomposites are becoming widespread in the present decade because its variety of advantages. Jatropha (jatropha curcas L) seed shell after separated from kernel can be used to produce carbon black because of its higher carbon content, and have the potentiality to use as reinforcement in composites. In this study, carbon black was produced from jatropha seed shell by carbonization in furnace method  for 1 hour at 600oC. Thermo gravimetric analysis to analyze seed shell of jatropha as raw material. The morphological properties of the carbon black were analyzed by elemental analysis by X-ray (EDX), SEM, TEM,  XRD, SEM, and TEM.  It was found that the yield of carbon black was 40% which included 4 different sizes ranging from 70 – 300 mesh in distribution of particle size analysis. Carbon black suggested that it could be a good filler or reinforcement in biocomposites
Measurement of cement’s particle size distribution by the buoyancy weighing-bar method Tambun, Rondang; Pratama, Nofriko; Hanum, Farida
International Journal of Science and Engineering Vol 10, No 2 (2016)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.913 KB) | DOI: 10.12777/ijse.10.2.74-77

Abstract

One of the important characteristics of cement quality is particle size distribution. There are several simple methods to measure the particle size distribution of cement based on the Stokes diameter, like Andreasen pipette method, sedimentation balance method, centrifugal sedimentation method, etc. A major disadvantages of these methods are they are time consuming process and require special skills. Particle size distribution also can be analyzed by using a different principle through microscopy, laser diffraction/scattering methods and Coulter counter method. Even these  methods produce highly accurate results within a shorter time, however, the equipments are expensive. In the present study, it has developed a new method to overcome the problem. The method is the buoyancy weighing-bar method. This method is a simple and cost-effective. The principle of the buoyancy weighing-bar method that the density change in a suspension due to particle migration is measured by weighing buoyancy against a weighing–bar hung in the suspension, and the particle size distribution is calculated using the length of the weighing-bar and the time–course change in the the apparent mass of the weighing–bar. This apparatus consists of an analytical balance with a hook for underfloor weighing, and a weighing–bar, which is used to detect the density change in suspension. The result obtained show that the buoyancy weighing–bar method is suitable for measuring the particle size distribution of cement, and the result is comparable to that of determined by settling balance method.
The Role of Calcium and Glucose on the Increasing of Parasitemia Value and Hemolysis into Plasmodium falciparum-infected Erythrocyte Asfirizal, Verry
International Journal of Science and Engineering Vol 10, No 2 (2016)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.063 KB) | DOI: 10.12777/ijse.10.2.63-66

Abstract

Erythrocyte infected by Plasmodium experiences various changes of shape and function. The permeability increases upon various dissolved material including amino acid, glucose, vitamin, nucleotide, purine, anion/cation and organic/inorganic and also others simple dissolved materials such as sorbitol, choline and chloride-ion. The increasing of permeability is very needed by Plasmodium to provide nutrients for internal growth. The objectives of this research were to determine the increasing of parasitemia value and hemolysis on erythrocyte infected by Plasmodium falciparum. The medium culture used for growing Plasmodium falciparum was RPMI 1640 that produced parasitemia 15%, inoculation was conducted to produce sub-culture that produced parasitemia 20% and divided into calcium, glucose and control (CM 10%) treatment with 3 times replications. Observation was conducted from the first day to sixth day after treatment. Parasitemia and hemolysis parameters as growth indicators were observed. Difference among treatments groups were analyzed using ANOVA and followed by Duncan Multiple Range Test (DMRT α=0.05). The result showed that the application of calcium + glucose produced the highest number of parasitemia (11.87±4.71) (means ±SD) and hemolysis (0.278+0.012) compared with others applications i.e. calcium, glucose and control medium culture (10% CM). This application produced significant difference (p<0.05). It was concluded that calcium and glucose had important to increase parasitemia and hemolysis of  Plasmodium  falciparum-infected erythrocyte
TECHNO ECONOMY ANALYSIS A SMALL SCALE REVERSE OSMOSIS SYSTEM FOR BRACKISH WATER DESALINATION Widiasa, I Nyoman; Yoshi, Linda Aliffia
International Journal of Science and Engineering Vol 10, No 2 (2016)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (960.918 KB) | DOI: 10.12777/ijse.10.2.51-59

Abstract

This study aims to get the design process and the economics of small-scale desalination of brackish water in Indonesia which has interest in the range of 12-14%, electricity cost of  $0.09-0.13/kWh, and groundwater tax regulation. The use of BWRO desalination system in Indonesia has been generally done at small scale. This study based on Bali island with electricity cost at $0.1/kWh and water tax at $0.37/m3. Techo economy evaluation was analysed for plant capacity of 150-1,00 m3/day, recovery of 40% with brackish water water salinity of 5,000 ppm. Price of desalted water during first year a case study is $1.31/m3. It can be concluded that economic evaluation based on NPV and IRR shows that it is worthed.

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