Judul: Pembangunan Framework untuk Deteksi Perubahan dan Irisan Wilayah pada Data Spatiotemporal
Abstrak: Spatial data changes that occur at any time can provide information in the form of objects which are subject to changes. Change of the objects proficiency level can be analyzed using the spatiotemporal query. Spatiotemporal query requires spatial operator design and temporal operator design rely heavily on the data, so that when used on different data will lead to changes in the variables of these operators without the semantic changes. Therefore, it takes spatiotemporal operator functions which are not dependent on the data. This study implements spatiotemporal operator functions into a framework. Framework is very useful to facilitate developers in the expansion and maintenance. In designing a framework, it takes some special parameters in order to make the framework goes well. The parameters used in the design are the object id, object name, object time, object area, centroid, and object geometry. In addition, spatiotemporal data are needed in the form of data sets per time in order to use this framework. This study has implemented spatiotemporal operator functions into a framework, but for different data further research are still required
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Judul: Implementasi Operator Temporal dan Spasial pada Data Spatiotemporal
Abstrak: The spatio-temporal data models and query languages have received much attention in the database research community because of their practical importance and the interesting technical challenges they pose. The previous research has successfully implemented temporal and spatial operator to retrieve specific information of spatio-temporal data, but only an example data was used. In this research, the implementation of the temporal and spatial operator using real data was shown. There were two data used, namely the land cover data in Kalimantan island from 2000-2009, and land use data in some region of Indonesia from 1994 and 2001. The research complexity increased because of the different attributes of real data as compared with example data. The method in this research consist of data preprossesing, temporal operator implementation, spatial operator implementation, spatio-temporal operator implementation, and testing. The preprocessing include data cleaning, and data model transformation. The temporal operator used in this research were history, after, before, when, between, first, last and past. Meanwhile, the spatial operator used were intersection, equal, touches, cover, coveredby, distance, overlap, contain and within. The result showed that the spatio-temporal operator can produce a more spesific information retrieval rather than that without using spatio-temporal query. The research also verified that spatio-temporal operator can be used in real problems
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Judul: Kajian Pemurnian Gliserol Hasil Samping Biodiesel Jarak Pagar Menggunakan Asam Nitrat, Sulfat, dan Fosfat
Abstrak: About ±10% glycerol is produced as byproduct in KOH alkali-catalysis transesterification of Jatropha curcas oil and methanol. The glycerol contains some soluble impurities such as catalyst, soap, excess methanol, water, and other substances. The glycerol needs purification treatment so that glycerol can be utilized into other products. The first step in the glycerol purification is mineral acid addition to neutralize the base content and to split the soap content into salt and free fatty acid that are more easily separated from glycerol. The purposes of this research are to select the kind of acid that could separate the glycerol from the base catalyst and soap, to study the effect of the molar amount of added acid, and to identify the quality of salt as byproduct of glycerol purification with the best treatment. The experiments conducted in complete randomized factorial design, consisted of two treatment factors: kinds and molar amount of mineral acids. Kind of acids were HNO3 15.27 M, H2SO4 18.01 M, and H3PO4 14.74 M. Molar amount of acids were 54 mmol, 90 mmol, 126 mmol, 162 mmol, and 198 mmol (added into 200 g of glycerol). The observed response variables were pH of glycerol, glycerol content, and ash content of glycerol. The crude glycerol from KOH alkali-catalysis of Jatropha curcas biodiesel production contained: glycerol (40.48%), KOH (2.39%), soap (7.82%), evaporated compounds at 1050C (46.81%), and ash (5.16%). The kind and molar amount of mineral acid significantly affected the pH-value, glycerol content, and ash content. The treatment with 126 mmol H3PO4 14.74 M, in 200 grams glycerol, resulted highest glycerol content (78.77%), lowest ash content (1.085%), and pH-value 6.63. Precipitated salt produced from the best treatment contained (based on dry base, except evaporated compounds): K2O (13.17%), P2O5 (20.14%), chloride (2.67%), free acid (26.18%), and evaporated compounds at 1300C (33.93%).
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