Judul: Pola Spasial Struktur Pasar Jasa Seks Komersial
Abstrak: The main objectives of this study are to map areas with the most attractive power to lure sex workers and areas with the most generative power to supply sex workers; to describe characteristics of those areas and their characterized indicators. The methods of analyses used in this study are descriptive analysis, Entropy Spatial Interaction Model, and Geographic Information System (GIS). The study shows that the regions with highly positive attractive power are Jayapura, Sorong and Merauke and those with highly negative attractive power are Karawang and Bekasi. These mean that an increase in commercial sex market development in Jayapura, Sorong and Merauke will induce the development of commercial sex market in other areas, meanwhile an increase in commercial sex market development in Karawang and Bekasi, will make the concentration of sex market only in these two areas, and therefore tend to diminish sex market in other areas. Moreover, it is found that the generative power is more powerful than the attractive power. This is because of poverty and lack of job opportunity in the source areas. Meanwhile, tight work competition in destination areas and relative low education level make to become sex workers is the only option available for young women. Therefore, alleviating poverty is one of the most powerful ways to diminish sex market development, beside localization.
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Judul: Accessibility to economic activities using geographic information system in DKI Jakarta Province
Abstrak: The urban spatial structure basically considers the location activities as well as their relationship. Accessibility interprates systematic relationship between spatial distribution and the intensity of development, and the quality of travel within a region. This study appraises the accessibility to economic activities for different socio-economic group, with specific reference to work trip in the Jakarta Metropolitan city. Accessibility has become a part of transport planning discusion but it is nor part of traditional transport model, therfore, it lacks formal definition. The research was conducted in three part. The fisrt step, theoretical aspect of accessibility and its measurement were reviewed. Second step, data was collected during fieldwork both from primary and secondary data. Third step, accessibility analysis was done to appraise the level of accessibility. Results of the analysis shown that high-income area that located around the main CPA (Centers of Primary Activity) as well as Glodok Primary Centre, Tanah Abang Primary Centre, Kuningan Sudirman and Casablanca Trade Center, and Mangga Dua Trade Center. Then come middle-income area followed by the low- income suburbs. Investigation of distribution of economic activities shows that the city having centralised form in the past has experienced decentralisation. Still it is concentrated in high-income suburbs. Travel pattern of commuters in two sample areas reveals that bus, rail and taxi are the available modes of public transport, which are mostly used by low and middle-income suburbs. Use of multi-modal transport not found in the study area. High-income suburbs are highly dependent on car. Crime on public transport is the major factor to deter the high-income groups from using it. Walk as a mode is done by low paid job living in nearby area of the activities. Result from proximity analysis highlights that low and middle-income can access public transport better than high-income suburbs on average. Taxi serves maximum arsa followed by bus. Rail service is concentarted in limited areas. The percentage of low-income suburbs which can have access to the activities by public transport is compared based on income, in spite of having better access to public transport to low-income suburbs, people can access very low percent of the activities on average within the standard considered for this study. Middle- income suburbs can access more than low-income group. Among the three income group, high-income suburbs can access the highest number of activities. Pedestrian of any income group have poor access, however high-income suburbs lead in this aspect also. It is concluded that the results strengthen the argument that there is imbalance in uistribution of activities. Provision of integrated fare structure may improve the accessibility especially for low and middle-income suburbs. Pedestrian accessibility result highlights how activities are concentrated in Centers of primary Activity (CPA) nodes. Finally, transportation is not the sole factor that affect the accessibility but the distribution of activities has also influenced it.
Keyword: GIS, main CPA

Judul: Sintesis Paduan Ti-6Al-4Nb sebagai Matrial Implan Pengganti Komponen Tibial
Abstrak: Synthesis of Ti-6Al-4Nb alloy was done by melting using Tri Arc Melting Furnace. Each sample was remelted five times to ensure the homogenity. Aluminum and niobium addition were expected to stabilize α phase and β phase until the αβ-titanium alloy was resulted. Yet based on the experiment, it was α-titanium alloy resulted. α-titanium alloy was a Hexagonal Close Packed (HCP) crystalline structure which would be cracked if deformation non-uniaxial happens. The presence of oxygen in pure titanium significantly increased the hardness of titanium. The addition of aluminum was also able to increase the hardness of titanium alloy because aluminum more stabilize the α phase in the α-titanium alloy. The corrosion ressistance of titanium could be increased by adding aluminum and niobium. Titanium coating with HA/chitosan composite was also proved in decreasing the corrosion rate because it barried direct interaction between titanium alloy and corrotion solution.
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