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Proceedings of Annual International Conference Syiah Kuala University - Life Sciences & Engineering Chapter
Published by Universitas Syiah Kuala
ISSN : -     EISSN : -     DOI : -
Core Subject : Education, Engineering,
Engineering Other
Arjuna Subject : -
Articles 30 Documents
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Search results for , issue "Vol 1, No 2 (2011): Engineering" : 30 Documents clear
Analysis quality control (QC) on CT scan in RSUZA Banda Aceh an effort to get the best quality in image R. Safitri; Y. Evi; P. Heru; . Bustami
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (143.608 KB)

Abstract

Quality Control (QC) on the Computerized Tomography scanning (CT scan) have been done to ensure the quality of CT scan image. The best quality will improve diagnostic accuracy and ultimately providing maximum services to the patients. QC monitoring has been conducted on the CT scan in the Rumah Sakit Umum Zainal Abidin (RSUZA) Banda Aceh to monitoring the image and measuring the value of Computed Tomography Dose Index (CTDI). The purpose of this study was to determine was dose received by an object and observe the appearance of a clear image. The research was carried out by using pencil ionization chamber detectors to obtain the doses from CT scans and using the phantom to obtain the appropriate image. The results showed that the thickness of slices can affect the dose received at the time of exposure. In this study found no excessive dose received by an object with a very clear picture display
Computational fluid dynamics of crosswind effect on a flare flame . Wusnah; . Yunardi; Ilham Maulana; . Elwina; Novi Sylvia; Yazid Bindar
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

This paper presents the results obtained from the application of computational fluid dynamics (CFD) to modelling the crosswind effect on a turbulent non-premixed flame. A pre-processor software GAMBIT was employed to set up the configuration, discretisation, and boundary conditions of the flame being investigated.  The commercial software Fluent 6.3 was used to perform the calculations of flow and mixing fields as well as combustion. Standard k-ε and eddy dissipation models were selected as solvers for the representation of the turbulence and combustion, respectively.  The results of all calculations are presented in the forms of contour profiles.  During the investigation, the treatment was performed by setting a constant velocity of fuel at 20 m/s with varied cross-wind velocity and by keeping the cross-wind velocity constant at 1.1 m/s with varied fuel velocity.  The results of the investigation showed that the standard k-ε turbulence model in conjunction with Eddy Dissipation Model representing the combustion was capable of producing reliable phenomena of the flow field and reactive scalars field in the turbulent non-premixed flame being investigated. Other results of the investigation showed that increasing the velocity of the crosswind, when the fuel velocity was kept constant, significantly affected the flow field, temperature and species concentrations in the flare flame. On the other hand, when the velocity of the fuel was varied at the constant crosswind velocity, the increasing velocity of the fuel gave positive impact as it enabled to counteract the effect of crosswind on the flare flame
Preparations of chemical sensors for simple formalin detection in contaminated food (A model for final project works for pre-service teachers in chemistry subject) M. Adlim; . Hasan; Zarlaida Fitri; Yulida Amri; Martina Sari; Saiful Mahya
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Teaching chemistry must include some learning skills in scientific works. The students must have experience conducting small research in chemistry to train them the scientific methods. Some chemistry projects have been carried out by the students of teaching training college (FKIP) as called pre-service teachers in chemistry subject.  The students were given research problem that is how to formulate a simple sensor for detection of formalin in contaminated food. The students were asked to review literature on the composition and analysis technique of formalin. The students wrote the research proposal and presented their proposal in front of four reviewers before they start conducting research. The project of formalin sensor preparation was started with studies of the active reagent composition in liquids phase, immobilizing the active reagent in soft media, and following with studies of the sensor sensitivity toward formalin contamination in food. The Schiff Fuchsine (SF) and NASH methods for aldehyde determination were chosen as the basic theory for formalin determination.  Schiff Fuchsine (SF) in diluted sulfuric acid solution was kept overnight before use.  The media for holding of the reagent was cotton coated with chitosan, then it was pasted in tacon foil, this sensor was called forpastrip (student project-1). It could detect formalin as low as 2% (v/v) of formalin or equivalent with 0,8% of formaldehyde in contaminated food and the expired date was 10 weeks. The forpastrips was tested on food and the chemical interference was also studied (student project-2). Another project was also carried by replacing the cotton with synthetic felt and this formula was recorded as student project-3. The SF reagent immobilized in synthetic felt coated by chitosan was inserted into narrow-plastic straws. The sensitivity of this sensor increased and the detection limit as low as 0.25% (v/v) of formalin in contaminated food and the expired date was more than 12 weeks. The forth project was replacing SF with NASH reagent immobilized in cotton coated by chitosan and inserted in narrow-plastic straws. The detection limit was 0.015% (v/v) of formalin in contaminated food. All Sensors were still effective to detect formalin in sample although the sample contained of sugar, salt, fat and protein as the impurity. The research findings were written by students in their final report (script, like a thesis) after approved by the two supervisors. They students then presented their research in comprehensive exam in front of reviewers before they were graduated. Having interviews with students, they claimed that they have experience in conducting research, have followed all scientific methods. They said the research theme is very interesting, simple, contextual and it might be applied in high schoo
The performance of asphalt-concrete wearing-course (AC-WC) mixture by using rice husk ash as filler with the addition of asbuton in asphalt pen 60/70 as binder Maizal Kamil; Renni Anggraini; Fitrika Mita Suryani
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

The supply of stone dust as filler and asphalt as binder is limited, therefore it is necessary to use an alternative to filler and asphalt import. The problem is expected to be overcome by the presence of rice husk ash as a filler and natural asphalt of Buton Island (Asbuton) as a binder. This study aims to evaluate the performance of Asphalt Concrete-Wearing Course (AC-WC) mixture by using rice husk ash as a filler and asphalt penetration 60/70 as binder with the addition of Asbuton. The specimens were made into two major groups: (i) the specimens using stone dust and asphalt pen 60/70 (ABA), and (ii) the specimens using rice husk ash and asphalt pen 60/70 with the addition of asbuton (ASA). The last group was performed with four variations: 0% (ASA 0), 5% (ASA 5), 10% (ASA 10), and 15% (ASA 15) over the total weight of the mixture. Total specimens were 75, each has 15 specimens. Asphalt contents used were 4.5% to 6.5%. Specifications used the standards of the Departemen Permukiman dan Prasarana Wilayah (2005) by using Marshall method Optimum asphalt contents (OAC) for each mixture were 5.6% (ABA), 6.0% (ASA 0), 6.3% (ASA 5), 5.9% (ASA 10), and 5.8% (ASA 15). In sum, the asphalt concrete mixture using rice husk ash as filler was able to compete with the one using stone dust as filler, and therefore can be used as alternative materials to road pavement construction.
Exact solutions for a class of matrix Riemann-Hilbert problems Amir T. Payandeh Najafabadi; . Kucerovsky
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Consider the matrix Riemann-Hilbert problem. In contrast to scalar Riemann-Hilbert problems, a general matrix Riemann-Hilbert problem cannot be solved in term of Sokhotskyi-Plemelj integrals. As far as the authors know,  the only known exact solutions known are for a class of  matrix Riemann-Hilbert problems with commutative and factorable kernel, and a class of homogeneous problems. This article employs the well known Shannon sampling theorem to provide exact solutions for a class of matrix Riemann-Hilbert problems. We consider matrix Riemann-Hilbert problems in which all the partial indices are zero and the logarithm of the components of the kernels and their nonhomogeneous vectors are functions of exponential type (equivalently, band-limited functions). Then, we develop exact solutions for such matrix Riemann-Hilbert problems. Several well known examples along with a remark on the case of functions not of exponential type  are given. 
Preliminary study on the adsorption of lead (II) ions from aqueous solution with breadfruid’s bark (Artocarpus altilis) by un-modified and modified with citric acid Lia Mairiza; Muhammad Zaki; . Nurhayati; Evi Juliyanti
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

The adsorption of lead(II) ions from aqueous solution with breadfruit’s bark by unmodified and modified with citric acid was investigated. The results by using adsorbent dosage 20 g/L indicated the   adsorption efficiency was up to 99%, and the best result is obtained about 99,963% when adsorbate is  conducted with modified bark for 90 minutes. The adsorption behavior by modified bark followed the Langmuir isotherm model and the Freundlich isotherm model for modified bark. The maximum adsorption capacity of lead(II) ions are 34,98 mg adsorbate/g adsorbent for unmodified bark when contact time is 60             minutes. The influence of contact time showed that adsorption reached the equilibrium rapidly. A batch adsorption model followed the pseudo second order kinetic.
Frequency of use minute concentrations of cadmium in aqueous solution by near infrared spectroscopy and aquaphotomics Hesti Meilina; A. Putra; R. Tsenkova
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Cadmium (Cd) is a common industrial pollutant with long biological half-life, which makes it a cumulative toxicant. Near-infrared spectroscopy has been successfully used for quick and accurate assessment of Cd content in agricultural materials, but the development of a quick detection method for ground and drinking water samples is of equal importance for pollution monitoring. Metals have no absorbance in the NIR spectral range, thus the methods developed so far have focused on detection of metal-organic complexes. This study uses Aquaphotomics to measure Cd in aqueous solutions by analyzing the changes in water spectra that occur due to water-metal interaction. Measurements were performed with Cd (II) in 0.1 M HNO3, in the 680-1090 nm (water second and third overtones) and 1110-1800 nm (water first overtone) spectral regions, and were subjected to partial least-square regression analysis. A concentration of Cd from 1 mg L-1 to 10 mg L-1 could be predicted by this model with average prediction correlation coefficient of 0.897. The model was tested by perturbations with temperature and other metal presence in the solution. The regression coefficient showed consistent peaks at 728, 752, 770, 780, 1362, 1430,1444, 1472/1474 and 1484 nm under various perturbations, indicating that these water absorbance changes were due to Cd presence. The residual predictive deviation values (RPD) were greater than 2, indicating that the model is appropriate for practical use
Planning and analyzing DVB-T technology in Pulo Aceh using high altitude platform station Rizal Munadi; Anwar Siddiq; . Roslidar
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

 Abstact. The development of telecommunication technologies has shown remarkable improvement rapidly in this decade, one of which is in information computer and telecommunication technology. On the other hand, the services can be provided with the advance of information technology has not reached all levels of society. In Indonesia, geographic and demographic factors are among the obstacles that limit the dissemination of information. This generally occurs in remote areas such as Pulo Aceh region. To solve the problem, this study proposes a solution to overcome the isolation of information. The technology chosen for the dissemination of information is the Digital Video Broadcasting-Terrestrial (DVB-T) using High Altitude Platform Station (HAPS) technology to provide the services. The implementation of HAPS technology is expected to be able to be used as an alternative for minimizing the high cost of terrestrial infrastructure investment. This discussion is devoted to the planning of implementing HAPS in Pulo Aceh to serve the needs of communication to that community. Based on ITU recommendation, the results show that the analysis of link budget calculation with elevation angle, 34.060 has met the standard requirement. It can be concluded that Pulo Aceh can be served by a single HAPS both in terms of capacity and coverage area.
Optimization of cyclone geometry for maximum collection efficiency . Yunardi; Ilham Maulana; . Elwina; . Wusnah; Novi Sylvia; Yazid Bindar
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

This paper presents the results obtained from the application of both computational fluid dynamics (CFD) Fluent 6.3 and Design Expert codes to modelling and optimizing a gas-solid cyclone separator based upon its geometrical parameters. A pre-processor software GAMBIT was employed to set up the configuration, discretisation, and boundary conditions of the cyclone.  A commercial CFD code FLUENT 6.3 was employed to simulate the flow field and particle dynamics in the cyclone. The optimization study was performed under either a constant gas inlet flow rate of 0.075 m3/s or a constant inlet gas velocity of 18 m/s. A response surface methodology with three levels (-1, 0, and +1) was employed as the experimental design. Independent variables to be optimized include the ratio of inlet gas width to diameter of the cyclone, W/D, the ratio of conical length to diameter, Lc/D and the ratio outlet diameter to cyclone diameter De/D. The response variables of collection efficiency and pressure drop were correlated in the forms of quadratic polynomial equations. The simultaneous optimization of the response variables has been implemented using a desirability function (DF) approach, computed with the aid of Design Expert software.  The results of investigation showed that at constant flow rate, the following optimum ratios of W/D =0,28, Lc/D =1,5,  and De/D =0,52 were obtained to give a collection efficiency of 90% and a pressure drop of 155 Pa. At the constant inlet gas velocity, the following optimum ratios of W/D =0,25, Lc/D =1,5,  and De/D =0,57 were obtained to give a collection efficiency of 90% and a pressure drop of 190 Pa. This findings indicate that gas inlet treatment at either constant flow rate or constant inlet gas velocity does not produce significant difference on the collection efficiency, but does give significant influence on the pressure drop.
Microbial community analysis during start-up of anaerobic co-digestion based on quinone profiles using supercritical fluid extraction Asri Gani; Ahmed Fall; Hiroyuki Daimon
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

Quinone profile is well known as a useful tool for the analysis of microbial community dynamics in mixed cultures in terms of quantification, simplicity, and reproducibility. The application of quinone profile method in anaerobic digestion is to monitor and overcome instability during fermentation process. A lab-scale anaerobic digestion treating a mixture of milk cow manure (CM) and simulated food waste (FW) during start-up process at mesophilic conditions was used to monitor the change of microbial community dynamics and stability. Supercritical fluid extraction (SFE) experiments using CO2 and ultra-high performance liquid chromatography (UPLC) was applied for extract and determination of ubiquinones (UQ) and menaquinones (MK) species. Quinone can be a helpful tool to make the link between microbial community and anaerobic digestion parameters in order to overcome digester instability during the start-up process.

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