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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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Physical Characteristics of Pressed Complete Feed for Dairy Cattle M. Munasik; C. Imam Sutrisno; Syaiful Anwar; Caribu Hadi Prayitno
International Journal of Science and Engineering Vol 4, No 2 (2013)
Publisher : Chemical Engineering Diponegoro University

The study was aimed to evaluate the physical characteristics of the pressed complete feed in the forms of cube, cylinder and ball. The study was conducted to get a complete feed of dairy cows that can be developed commercially. The evaluation was done on a physical test : bulkiness, hardness and hygroscopic properties of pressed complete feeds. The results of this research showed that the bulkiness of pressed complete feed in the forms cubes, cylinders and balls were between 0.20 up to 0.48 liter/kg; the hardness of pressed complete feed, cylinders and balls were 3 lbs up to 14 lbs; the hygroscopic factor of pressed complete feed in the forms cubes, cylinders and balls were around 1.10% up to 9.69%. The pressed complete feed in the forms of cube and cylinder are better than the form of ball in physical characteristics.doi: 10.12777/ijse.4.2.2013.61-65

Drying Characteristics and Product Quality of Lemon Slices Dried with Hot Air Circulation Oven and Hybrid Heatpump Dryers Yong Hong Lee; Siew Kian Chin; Boon Kuan Chung
International Journal of Science and Engineering Vol 8, No 1 (2015)
Publisher : Chemical Engineering Diponegoro University

In this research, drying characteristics and product quality of Coulomb-force-assisted heatpump and oven dried lemon slices were studied. Lemon slices with 3 mm thickness each, were dried using oven and Coulomb-force-assisted-heatpump dryer with and without auxiliary heater at different drying conditions. It was found that the drying rate of the lemon slices dried by all drying methods showed only falling rate states, which indicates the drying kinetics were controlled by internal moisture diffusion. Oven drying of lemon slices at 60°C showed the highest drying rate among all, followed by oven dried slices at 50°C, Coulomb-force-heater-assisted-heatpump (CF-HT-HP) dried slices at 31°C, Coulomb-force-assisted-heatpump (CF-HP) dried slices at 22°C, oven dried slices at 40°C and heatpump dried slices at 22°C. The average effective moisture diffusivity value for the slices dried with these drying methods was found in the range of 16.2 to 63.8´10-4 mm2min-1. In terms of quality assessment, CF-HP dried lemon slices retained the highest amount of Vitamin C as compared to the lemon slices dried by other drying methods. However, it retained relatively lower amount of total phenolic content (TPC) as compared to oven dried products. Among of all, CF-HP drying method produced dried lemon slices with the highest Vitamin C (6.74 mg AA / g dry weight) whereas oven dried lemon slices at 50°C preserved most of the TPC in the dried slices, which recorded as 13.76 mg GA / g dry weight.

The role of fluoxetine on macrophage function in chronic pain (Experimental study in Balb/c mice) Dwi Pudjonarko; Edi Dharmana; OS Hartanto
International Journal of Science and Engineering Vol 9, No 1 (2015)
Publisher : Chemical Engineering Diponegoro University

Chronic pain raises stress conditions such as depression that can lower the cellular immunity. Fluoxetine is an antidepressant used as an adjuvant in pain management but no one has been linked it with the body immune system. The objectives of this research were to proof the benefits of fluoxetine in preventing degradation of macrophage function in chronic pain by measuring the macrophage phagocytic index , macrophage NO levels and the liver bacterial count in BALB/c mice infected with Listeria Monocytogenes.A Post Test - Only Control Group Design was conducted using 28 male mice strain BALB /c, age 8-10 weeks. The control group (C), mice got the same standard feed as the other groups. Chronic pain group (P), mice were injected with 20μL intraplantar CFA on day-1. Pain + fluoxetine early group (PFE) were treated with P + fluoxetine 5 mg / kg ip day-1, the 4th, the 7th and the 10th, while the Pain + fluoxetine late group (PFL) were treated with P + fluoxetine 5 mg / kg ip on day 7th and 10th. All mice were injected with 104 live Listeria monocytogenes iv on day 8th. Termination was performed on day 13th. Differences within groups were analyzed using One-way ANOVA and Kruskall Wallis, whereas the correlation of variables were analyzed using Pearson's product moment. The experimental results showed that The macrophage phagocytic index and NO macrophage level (pg/mL) in PFE group(2,24±1,013; 0,24±0,239) was higher than than P group (1,68±0,920; 0,21±0,263) and there was no different in the macrophage phagocytic index of PFE group compared to C group (p=0,583; p=0,805). In PFL group (4,32±1,459; 0,54±0,294) the macrophage phagocytic index as well as NO macrophage level (pg/mL) was higher than P group (1,68±0,920; 0,21±0,263) with p=0,002; p=0,017. P group Bacterial count (log cfu/gram) (2,30±0,849) was significantly higher than C group(1,15±0,223) (p=0,007), while PFE group bacterial count (1,96±0,653) and PFL group bacterial count (1,84±0,403) compared to C (1,15± 0,223) was not significantly different (p=0,093; p=0,220). Correlation found between macrophage phagocytic index and macrophage NO (r=0,515, p=0,005).Macrophage phagocytic index and macrophage NO showed no correlation with bacterial count (r=-0,051, p=0,798; r=-0,071, p=0,719).It can be concluded that fluoxetine significantly incerases macrophage phagocytosis index and macrophages NO level in mice with chronic pain, on the other hand fluoxetine decreases liver bacterial count . There is a positive correlation between macrophage phagocytosis index and macrophages NO level, while no correlation observed among two variables with mice liver bacterial count in chronic pain.

The Influence of Malt Extraction Adding to UF Fresh Low Fat Cheese on Its Textural Properties Zahra Shafiei; Mohammad Hojjatoleslamy; Sahel Soha; Mohammad Ali Shariati
International Journal of Science and Engineering Vol 6, No 1 (2014)
Publisher : Chemical Engineering Diponegoro University

Today , demands for reduced fat products such as reduced fat cheeses is growing as it has shown in other food products , however high nutritional value of milk fat as a functional food can’t be ignored. This study deals with investigation of adding malt extract ( in 4 different concentration 0.075 , 0.1 , 0.15 and 0.2 % ) to ultra filtered cheese and comparing them with 2 control including a sample produced of milk containing 3.5 % fat and a 0.93 % fat and their rheological and textural properties evaluated at 3 , 20 , 40 and 60 days. Results indicate reduction of texture properties revealed. Rheological analysis exhibited the texture improvement by adding malt extraction; therefore this product can be use an additive to ultra filtered cheese to enhance its texture.[How to cite this article: Shafiei, Z., Hojjatoleslami, M., Soha, S., and Shariati, M.A. 2014. The Influence of Malt Extraction Adding to UF Fresh Low Fat Cheese on Its Textural Properties. International Journal of Science and Engineering, 6(1):57-60. Doi: 10.12777/ijse.6.1.57-60

Authors guideline editor support
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

Authors guideline

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.

Moving Object Tracking and Avoidance Algorithm for Differential Driving AGV Based on Laser Measurement Technology Pandu Sandi Pratama; Sang Kwun Jeong; Soon Sil Park; Sang Bong Kim
International Journal of Science and Engineering Vol 4, No 1 (2013)
Publisher : Chemical Engineering Diponegoro University

This paper proposed an algorithm to track the obstacle position and avoid the moving objects for differential driving Automatic Guided Vehicles (AGV) system in industrial environment. This algorithm has several abilities such as: to detect the moving objects, to predict the velocity and direction of moving objects, to predict the collision possibility and to plan the avoidance maneuver. For sensing the local environment and positioning, the laser measurement system LMS-151 and laser navigation system NAV-200 are applied. Based on the measurement results of the sensors, the stationary and moving obstacles are detected and the collision possibility is calculated. The velocity and direction of the obstacle are predicted using Kalman filter algorithm. Collision possibility, time, and position can be calculated by comparing the AGV movement and obstacle prediction result obtained by Kalman filter. Finally the avoidance maneuver using the well known tangent Bug algorithm is decided based on the calculation data. The effectiveness of proposed algorithm is verified using simulation and experiment. Several examples of experiment conditions are presented using stationary obstacle, and moving obstacles. The simulation and experiment results show that the AGV can detect and avoid the obstacles successfully in all experimental condition. [Keywords— Obstacle avoidance, AGV, differential drive, laser measurement system, laser navigation system].

THE EFFECT OF ANNEALING TEMPERATURES AFTER THERMOMECHANICAL PROCESS TO THE CORROSION BEHAVIOR OF Ni3(Si,Ti) IN SULFATE SOLUTION Gadang Priyotomo; Yasuyuki Kaneno
International Journal of Science and Engineering Vol 8, No 2 (2015)
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, polarization method, scanning electron microscope in 0.5 kmol/m3 H2SO4 solution at 303 K. Moreover, the corrosion behaviour of austenitic stainless steel type 304 was studied under the same experimental conditions as reference. It was found that the intergranular attack and uniform attack were observed on Ni3(Si,Ti) after thermomechanical and annealing processes (1173K and 1273K) respectively in the immersion test. From the immersion test and polarization curves, all annealed Ni3(Si,Ti) had less corrosion resistance compared to type 304. In addition, Ni3(Si,Ti) was difficult to form a stable passive film, but not for type 304.

Source apportionment of PM2.5 bound Polycyclic Aromatic Hydrocarbons from a Tricity in the foothills of Himalayas in Northern India Sandeep Garg; Anita rajor; Amit Dhir
International Journal of Science and Engineering Vol 13, No 1 (2019)
Publisher : Chemical Engineering Diponegoro University

This study highlights variability in mass levels and source identification of PM2.5 bound polycyclic aromatic hydrocarbons (PAHs) in the tricity of Chandigarh, Mohali and Panchkula in India. The samples of PM2.5 werecollected from industrial and residential and sensitive receptor sites during summer (April-May 2015) and winter (December 2015-January 2016) season. Sampling was done using medium volume sampler and chemical analysis was done using gas-chromatography technique. The average mass levels of PM2.5 varied from 31 to 91 µg m-3 exceeding to NAAQ standard of 60µg m-3 and total PAHs varied from 5.76 to 75.62 ngm-3 with a seasonal variability as higher in winter than in summer season. The positive correlation between PM2.5 & TPAHs suggested similarity in source and origin. Diagnostic ratio and principal components analysis suggested vehicular emissions, coal combustion, wood and biomass burning as the main source of PAHs in the study area for potential health hazards.

Influence of Silica/Sulfonated Polyether-Ether Ketone as Polymer Electrolyte Membrane for Hydrogen Fueled Proton Exchange Membrane Fuel Cells Sri Handayani; Eniya Listiani Dewi Listiani Dewi
International Journal of Science and Engineering Vol 2, No 2 (2011)
Publisher : Chemical Engineering Diponegoro University

The operation of non-humidified condition of proton exchange membrane fuel cell (PEMFC) using composite sPEEK-silica membrane is reported. Sulfonated membrane of PEEK is known as hydrocarbon polyelectrolyte membrane for PEMFC and direct methanol fuel cell (DMFC). The state of the art of fuel cells is based on the perluorosulfonic acid membrane (Nafion). Nafion has been the most used in both PEMFC and DMFC due to good performance although in low humidified condition showed poor current density. Here we reported the effect of silica in hydrocarbon sPEEK membrane that contributes for a better water management system inside the cell, and showed 0.16 W/cm2 of power density which is 78% higher than that of non-silica modified [Keywords: composite membrane, polyether-ether ketone, silica, proton exchange membrane fuel cell].

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