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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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Aims and Scopes, Editorial Boards, Preface, Table of Contents Editor Support
International Journal of Science and Engineering Vol 7, No 2 (2014)
Publisher : Chemical Engineering Diponegoro University

Aims and Scopes, Editorial Boards, Prefce, Table of Contents

Corrosion Behavior of Ni3(Si,Ti) in Hydrochloric Acid Solution Gadang Priyotomo; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 5, No 1 (2013)
Publisher : Chemical Engineering Diponegoro University

The corrosion behaviour of the intermetallic compounds Ni3(Si,Ti) (L12: single phase), has been investigated using an immersion test, electrochemical method, scanning electron microscope in 0.5 kmol/m3 HCl at 303 K. In addition, the corrosion behaviour of austenitic stainless steel type 304 and C276 was studied under the same experimental conditions as references. It was found that the intergranular attack was observed for Ni3(Si,Ti) in the immersion test. From the immersion test and polarization curves, Ni3(Si,Ti) had the moderate corrosion resistance, while the corrosion resistances of C 276 and type 304 were the highest and the lowest. Ni3(Si,Ti) and type 304 were difficult to form a stable passive film, but not for C276. A further experiment must be conducted to clarify the stability of film for Ni3(Si,Ti) in detail.

Correlation of Folic Intake and Internal Carotid Artery Intima-Media Thickness Changes In Post Ischemic Stroke Patients Dodik Tugasworo; Dwi Pudjonarko; Latifah Latifah
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

The thickness of the carotid artery intima media / intima-media thickness (IMT) is one of atherosclerosis markers. Atherosclerosis is one of the causes of ischemic stroke. Some studies suggest that low folate intake is predicted to affect the atherosclerotic process, but this remains controversial. Our objective is to analyze the relationship between folate intake with changes in the internal carotid artery IMT after ischemic stroke patients.The study is one group pretest posttest design with 72 post ischemic stroke subjects from neurology polyclinic of Kariadi Hospital, from June to December 2013. Folate intake was measured by Food Frequency Questionnaire and the internal carotid artery IMT by duplex ultrasonography. Measurements were taken at two periods with 6 months interval. Other factors that affect atherosclerosis consisting of age, obesity, hypertension, dyslipidemia, diabetes mellitus. The analysis in this study using Spearman correlation, chi-square and logistic regression. Resultwas significant if the p value were <0.05.There were 44 male subjects (61.1%) and 28 female subjects (38.9%). The mean age was 61.6 (SD = 7.99) years. The mean intake of folate was 178.10 (SD = 38.875) mg / day. Median serum folic acid level 8.43 (4.96 to 55.01) NML / L. The mean change in ICA IMT was 0.10 (SD = 0.156) mm. Folate intake was not correlated with serum levels of folic acid. Serum folic acid levels are not correlated with changes in the internal carotid artery IMT. There was correlation between the risk factors of age, BMI, hypertension, diabetes and dyslipidemia with changes in the internal carotid artery IMT.

Increasing Biogas Production Rate from Cattle Manure Using Rumen Fluid as Inoculums Budiyono Budiyono; I Nyoman Widiasa; Seno Johari; S Sunarso
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

In this study, rumen fluid of animal ruminant was used as inoculums to increase biogas production rate from cattle manure at mesophilic condition. A series of laboratory experiments using 400 ml biodigester were performed in batch operation mode. Given 100 grams of fresh cattle manure (M) was fed to each biodigester and mixed with rumen fluid (R) and tap water (W) in several ratio resulting six different M:W:R ratio contents i.e. 1:1:0; 1:0.75:0.25; 1:0.5:0.5; 1:0.25:0.75; and 1:0:1 (correspond to 0; 12.5; 25, 37.5; 50, and 100 % rumen, respectively) and six different total solid (TS) contents i.e. 2.6, 4.6, 6.2, 7.4, 9.2, 12.3, and 18.4 %. The operating temperatures were at room temperature. The results showed that the rumen fluid inoculated to biodigester significantly effected the biogas production. Rumen fluid inoculums caused biogas production rate and efficiency increase more than two times in compare to manure substrate without rumen fluid inoculums. The best performance for biogas production was the digester with rumen fluid and TS content in the range of 25-50 % and 7.4 and 9.2 %, respectively. These results suggest that, based on TS content effects to biogas yield, rumen fluid inoculums exhibit the similar effect with other inoculums. Increasing rumen content will also increase biogas production. Due to the optimum total solid (TS) content for biogas production between 7-9 % (or correspond to more and less manure and total liquid 1:1), the rumen fluid content of 50 % will give the best performance for biogas production. The future work will be carried out to study the dynamics of biogas production if both the rumen fluid inoculums and manure are fed in the continuous system Doi: 10.12777/ijse.6.1.31-38 [How to cite this article: Budiyono, Widiasa, I.N., Johari, S. and Sunarso. (2014). Increasing Biogas Production Rate from Cattle Manure Using Rumen Fluid as Inoculums. International Journal of Science and Engineering, 6(1),31-38. Doi: 10.12777/ijse.6.1.31-38]

The Correlation between Total Ischemic Time with Length of Hospitalization : a Single Centre Report Eriawan Agung Nugroho; Muhamad Azwin Kamar; Dila Junita
International Journal of Science and Engineering Vol 13, No 1 (2019)
Publisher : Chemical Engineering Diponegoro University

Kidney transplantation is recognized as an advanced modern therapeutic modality for patients with end stage renal failure. Cold Ischemic Time (CIT) has been found as an important independent risk factor for delay graft function (DGF) in kidney transplantation. Recent studies suggested that prolonged Warm Ischemic Time (WIT) may decrease graft’s survival in living kidney transplantation donor.This study aimed to evaluate the total ischemic time during recipient surgery and accessed its contribution for hospitalization time in kidney transplantation patients.This is an observational, cross sectional study. The datawas collected from medical record of patient who underwent kidney transplantation from 2014 until December 2018at Kariadi General Hospital Semarang. There were 28 patients, 18 were maleand 10 were female.Total ischemic time was compared with length of hospitalization. Data was analyzed with Spearman test in SPSS version 23. The study showed that total ischemic time was significantly correlated with hospitalization time (p < 0.001). However, donor’s age did not affect prolonged total ischemic time with p = 0.673, which is not significant (significant if p value < 0.05). In conclusion, total ischemic time has a significant correlation with hospitalization time. In contrary, no significant correlation between donor’s age and prolonged total ischemic time.

The effect of tofu cake as an additional feed on local male sheep’s water consumption and their physiological response Wayan Sukarya Dilaga; R. Adiwinarti
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

Feeds are very important for the growth of animals due to it is contained almost all nutrients needed by the animals. Feeds are not only influence the animal growth but also their physiological response. The objective of this research was to investigate the effect of tofu cake as an additional feed replacing commercial concentrate on local male sheep’s water consumption and their physiological response such as body temperature, pulse, and rate of exhalation. The selected 15 local male sheep (in the age of 8-9 month with initial weight 12.53 ± 1.19 kg) were housed individually in cage for about 14 weeks include 4 weeks adaptation period and 10 weeks experiment.The experiment was conducted using completely randomized design with 3 different treatments and 5 times repetition; T0 = ad libitum grass field + commercial concentrate, T1= ad libitum grass field + wet tofu cake, T2= ad libitum grass field + dried tofu cake, and water were provided in ad libitum method. Data analysis was done using analysis of variance (ANOVA) followed by Duncan’s multiple range test. The result shown that dried tofu cake as an additional feed replacing commercial concentrate was able to increasing the water consumption of local male sheep. Meanwhile the physiological test performed stable in the present of wet or dried tofu cake. Keywords— alternative feed, physiological response of male sheep

Reliability based design optimization of concrete mix proportions using generalized ridge regression model Rachna Aggarwal; Maneek Kumar; R.K. Sharma; M.K. Sharma
International Journal of Science and Engineering Vol 8, No 1 (2015)
Publisher : Chemical Engineering Diponegoro University

This paper presents Reliability Based Design Optimization (RBDO) model to deal with uncertainties involved in concrete mix design process. The optimization problem is formulated in such a way that probabilistic concrete mix input parameters showing random characteristics are determined by minimizing the cost of concrete subjected to concrete compressive strength constraint for a given target reliability. Linear and quadratic models based on Ordinary Least Square Regression (OLSR), Traditional Ridge Regression (TRR) and Generalized Ridge Regression (GRR) techniques have been explored to select the best model to explicitly represent compressive strength of concrete. The RBDO model is solved by Sequential Optimization and Reliability Assessment (SORA) method using fully quadratic GRR model. Optimization results for a wide range of target compressive strength and reliability levels of 0.90, 0.95 and 0.99 have been reported. Also, safety factor based Deterministic Design Optimization (DDO) designs for each case are obtained. It has been observed that deterministic optimal designs are cost effective but proposed RBDO model gives improved design performance.

Fabrication and Characterization of Polyimide-CNTs hybrid membrane to enhance high performance CO2 separation Tutuk Djoko Kusworo; Budiyono Budiyono; Ahmad Fauzi Ismail; Azeman Mustafa
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

This study investigates the CO2 separation performance of a hybrid membranes flat sheet based on polyimide incorporated with carbon nanotubes (CNTs) particles. CNTs was selected and its loading were a 1 wt% in total solid. The hybrid composite membranes were fabricated in order to increase their separation performance for the gaseous mixture of CO2 and CH4. Hybrid Composite membrane incorporated carbon nanotubes were mannufactured by the dry-wet phase inversion technique using flat sheet membrane casting machine system, in which the CNTs were embedded into the polyimide membrane and the resulting membranes were characterized. The results from the FESEM, DSC and FTIR analysis confirmed that chemical modification on carbon nanotubes surface had taken place. Sieve-in-a-cage’ morphology observed shows the poor adhesion between polymer and unmodified CNT. The results revealed that the good multi-wall carbon nanotubes dispersion leads to enhanced gas permeation properties. It is also concluded that addition of carbon nanotubes particles into the matrix of Polyimide polymer has significant effect on the membrane structure and properties.

Application of Response Surface Methodology in Extraction of Bioactive Component from Palm Leaves (Elaeis guineensis) Nur Afiqah Arham; Nurul Amal Nadhirah Mohamad; Junaidah Jai; Jagannathan Krishnan; Noorsuhana Mohd Yusof
International Journal of Science and Engineering Vol 5, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

The hydroxyl groups of the polyphenols are capable to act as reducing agent for reduction reaction. The effect of drying temperature, extraction temperature and extraction duration were evaluated using central composite design which consists of 20 experimental runs. Response surface methodology (RSM) was used to estimate the optimum parameters in extracting polyphenols from the palm leaves. The correspondence analysis of the results yielded a quadratic model which can be used to find optimum conditions of extraction process. The optimum extraction condition of drying temperature, extraction temperature and extraction duration are 70°C, at 70°C of 10 minutes, respectively. Total polyphenols were determined by application of the Folin-Ciocalteu micro method and the extract was found contain of 8 mg GAE/g dry palm leaves at optimum conditions. Doi: 10.12777/ijse.5.2.95-100 [How to cite this article: Arham, N.A., Mohamad, N.A.N., Jai, J., Krishnan, J., Noorsuhana Mohd Yusof, N.M. (2013). Application of Response Surface Methodology in Extraction of Bioactive Component from Palm Leaves (Elaeis guineensis). International Journal of Science and Engineering, 5(2),95-100. Doi: 10.12777/ijse.5.2.95-100

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

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

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