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<![CDATA[Physically modified of sweet potato flour (Ipomea batatas) by variation of steaming time and drying method ]]>
<![CDATA[Anshar Patria]]>;
<![CDATA[Nida El Husna]]>;
<![CDATA[Yanti Meldasari Lubis]]>;
<![CDATA[Melly Novita]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[The major component of sweet potato flour is carbohydrate presented as starch. As other types of native starch that lack of physical and chemical characteristics, the sweet potato flour then is very limited in use. To improve the starch characteristics, it can be made by modifying the starch physically. This study was focused on modification of starch phisically by using autoclaving-cooling method with differ in steaming times (15 and 30 minutes) and drying methods (oven and sun drying). The results showed that the modified flour of sweet potato by autoclaving-cooling for one cycle has produce sweet potato flour with a granular structure that can expand and break, lower in starch content, higher in freezing and thawing stability, higher in water absorption index, and lower in hot and cooling viscosities]]>
<![CDATA[The effect of temperature on cr (vi) removal by using guava leaves as a biosorbent ]]>
<![CDATA[. Mariana]]>;
<![CDATA[Farid Mulana]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Preliminary research on Cr(IV) removal in a liquid waste using guava leaves (Psidium Guajava) as a bio-sorbent has been done. The experiments were conducted in a stirred batch reactor. The effect of temperature on efficiency and absorption capacity has been studied. Both the efficiency and absorptioncapacity are directly proportional to the temperature under the current experimental conditions. The results showed that optimum absorption capacity and absorption efficiency of Cr(VI) use of guava leaves obtained at stirring time 30 minutes.]]>
<![CDATA[Waste shells of cockle (Clinocardium nuttalli) as solid catalysts for transesterification of calophyllum inophyllum L. oil to biodiesel production ]]>
<![CDATA[Husni Husin]]>;
<![CDATA[. Zuhra]]>;
<![CDATA[Fikri Hasfita]]>;
<![CDATA[Wahyu Rinaldi]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[In this work, cockle (Clinocardium nuttalli) shell waste is massively produced by many restorant in Banda Aceh Indonesia. The cockle (Clinocardium nuttalli) shell is known high calcium; therefore it is potential to be used as calcium source of catalyst for transesterification reaction. The aim of thisresearch is to study the synthesis and characterization of Clinocardium nuttalli shell. Clinocardium nuttalli shell was prepared by calcinating the shell at 500 and 800°C. Synthesis of solid catalys was employed for transesterification reaction of calophyllum inophyllum L. oil. The reaction was carried out in batch reactor at temperature of 65oC and ratio of mrthanol:oil of 3:1 - 12:1. The synthesized samples were characterized by X-ray diffraction (XRD). Analysis data by XRD confirmed that the obtained crystal calcined at 500 oC areCaCO3 calcite, CaCO3 veterite, and CaO. XRD patterns of the colcined shell at 800 oC shows sharp peaks of crystalline phase of CaO. The best characteristics is obtained at calcined catalyst of 800oC with molar ratios of methanol:oil of 12:1, i.e. density 0.832 g/cm3, viscosity 4.92 cst, and yield 84.1%.]]>
<![CDATA[An optimization technique to prepare nurse schedule for a monthly time horizon ]]>
<![CDATA[Paramacutty Paramathevan]]>;
<![CDATA[W. B. Daundasekera]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Nurse scheduling problem is one of the most difficult scheduling problems to solve since its solution space is large and it expects to comply many constraints. There is no standard model or a method of solution for nurse scheduling. The main objective of this study is to search for a scientific method to prepare a monthly working schedule for a group of nursing officers employed in a hospital. We propose an optimization method to prepare an optimal schedule. Initially, we develop an optimization model by formulating the objective and the constraints of the problem. The optimization model that we are interestedin is a 0-1 Integer Linear Programming problem. We apply the Branch-and-Bound technique to solve the problem using the optimization software package LINGO. Finally, the solution to the optimization problem is formulated to a regular nurse schedule. The methodology is illustrated by preparing a monthly schedule for a private hospital in Sri Lanka.]]>
<![CDATA[The profiles of science and technology culture (STC) indicators ]]>
<![CDATA[A. Halim]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Culture of science and technology is the way of life of the academic community that includes ways of thinking, understanding and use of technology, beliefs, habits, how to use the language, attitudes, and judgments based on scientific methods and knowledge. Survey of 10 indicators of science and technologyculture conducted to 467 high school students in Indonesia and 784 students in Malaysia. Based on 10 indicators, developed an instruments of Likert attitude scale and a multiple choice tests as a basis for indicators of science and technology culture. The survey results showed that students SM Malaysia andIndonesia have the same ability and views about; Knowledge of Science and Technology Basic, Understanding the limitations of human reason, and understanding of science and technology indicators, and the student chooses more amenable Science and Technology activities conducted outside school hours. Overall, the profiles of Science and Technology culture among students SM SM Indonesia Malaysia and there is no significant difference at the 1% significance level (t = 0:04). Based on the interpretation of the scalesuggested by Green Akey, the results of this study showed that the culture of Science and Technology indicators proposed in this study include both categories, namely 0.75 (high) Indonesian and 0.74 (high) Malaysian. Therefore it can be said that Malaysian and Indonesian students have a positive attitude towards Science and Technology. In the context of the Science and Technology Education, the results of this study provide some indicators that can be used as learning objectives in the curriculum of Science and Technology in the Secondary School]]>
<![CDATA[Global Warming: Global warning for local actions ]]>
<![CDATA[Abdul Malek]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[After decades of global warming many are still in the dark as what needs to bedone to overcome this world threat that affects single citizen of the planet earth. The word ‘sustainability’ has been used very loosely, some not knowing the exact meaning of it only with intentions to gain research grant for the academics, profit making by keeping by the general business environment, thus leading to dumping the market with green-washing products. Those who seriously know the true meaning are not many and many times frustrated with the doings of the many which do not. This presentation hopefully providesome useful insights as to what sustainability means and for the necessary green initiatives that need to be taken to reduce further aggravation of the borderless geographical environment. Future growth in all countries are converging into a common trend and therefore efforts need to be in tandem and synchronized for a more effective win against this pervasive war of the world. Most tangible efforts are normally easily observed in the socio economic trend that affects the built environment of individual countries. The commoncues of the world are that it is getting hot, flat and crowded and to overcome this force is no easy task for any nation since the rhythm and tempo of growth of each nation differs. But one thing is common, that the rate of urbanization is rapid throughout the world. It was reported that by about 2030 the land-use for urbanization will be about 75% all over the world and so a relook at the socio economic policies must be geared towards how urbanization do not worsen the already bad situation from global warming.]]>
<![CDATA[Study on formation and mechanical properties of rice husk/natural bentonite prepared composites ]]>
<![CDATA[Farid Mulana]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[In this study, composites were made from source of virgin HDPE and rice husk/natural bentonite as combined filler and mechanical properties of composites were measured. The purpose of study is to find the best condition of the ratio of rice husk/natural bentonite as matrix and the percentage of polyethylene-graft-maleic anhydride (MAPE) as coupling agent on quality of formed composites. In order to form these composites a hot press method was performed. The composite formation process was conducted at temperature of 170 oC for half hour. After pressed and heated then composites was cooled to room temperature and finally composites were tested to know its mechanical properties of tensile strength and bending strength. The results showed that addition of natural bentonite into matrix of rice husk have increased mechanical properties of composite compared to composites prepared by using only rice husk and virgin HDPE. Percentage of added MAPE also affect values of tensile and bending strength of composites. The effect of MAPE and natural bentonite which added during formation of composites caused the increasing adhesion bond between matrix and filler and as a result also increased the mechanicalproperties of composites. The highest tensile strength value of 18.2 MPa was found on composite with filler rice husk/natural bentonite ratio of 70:30 with addition of 5 wt% MAPE. While the highest bending strength value of 9.2 Mpa was obtained on composite with filler rice husk/natural bentonite ratio of 70:30and addition of 5 wt% MAPE]]>
<![CDATA[Central composite design applied to purify lemongrass essential oil using vacuum distillation ]]>
<![CDATA[Muhammad Dani Supardan]]>;
<![CDATA[Dewi Ermaya]]>;
<![CDATA[Hesti Meilina]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Vacuum distillation process can be applied for purification of lemongrass essential oil by increasing the concentration of citral in lemongrass essential oil. In this study, the relationship between experimental parameters of purification of lemongrass oil was investigated. The effect of pressure, temperature and pH was examined to determine the best performance of the product yield. CentralComposite Design was applied to optimize the operating parameters of the process. It was found that the product yield of bottom product achieved an optimum level of 98.4% yield at the following reaction conditions, i.e. pressure of 55.9 mbar, temperature of 104.6oC and pH of 4.8]]>
<![CDATA[Teaching descriptive statistics using R ]]>
<![CDATA[Dedi Rosadi]]>;
<![CDATA[Khabib Mustofa]]>;
<![CDATA[Iman Sanjaya]]>;
<![CDATA[Hendra Perdana]]>;
<![CDATA[Krisna Mutiara Wati]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[In this paper, we introduce the application of R for teaching statistics descriptive subject which is usually given in the undergraduate statistics course. As an illustration, we will consider the use of R for teaching the subject frequency distribution table, both using the R-CLI and R-GUI version. The R-GUIversion used here is a part of Rplugin.SPSS which is currently under our extensive development. Rplugin.SPSS is a R Commander Plugin, which is a reorganized and an extented version of the menu of Statistics in R-Commander, a SPSS-like version menu. It can be also considered as the extended version of Rplugin.Econometrics (Rosadi, 2010). Further details and further examples can be found in Rosadi (2011,2013).]]>
<![CDATA[Effect of MHD on unsteady boundary layer flow past a sphere ]]>
<![CDATA[Nurul Farahain Mohammad]]>;
<![CDATA[Abdul Rahman Mohd Kasim]]>;
<![CDATA[Anati Ali]]>;
<![CDATA[Sharidan Shafie]]>
<![CDATA[ Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 3, No 2 (2013): Engineering ]]>
Publisher : <![CDATA[Syiah Kuala University ]]>
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<![CDATA[Magnetohydrodynamics (MHD) is a field of study which dealing with understanding the dynamic of fluid under the influence of magnetic presence. The effect of MHD in a fluid flow has the potential in controlling the separation of flow, optimizing the heat transfer involved or manipulate the velocity of fluidflow. In this paper, the separation times and flow characteristics of a viscous fluid flow past a sphere are investigated in the presence of magnetic field. In order to solve this problem, the dimensional equations that govern the fluid flow and heat transfer are transformed into dimensionless equations by usingappropriate dimensionless variables. The stream functions are introduced to connect and thus having a function that can represent both velocity u and v. Similarity variables are used to deduce the dimensionless governing equations into a system of nonlinear partial differential equations. This system of equations is solved numerically by using numerical scheme known as the Keller-Box method. The results attained are presented graphically and in tabular form]]>
