Judul: Skenario untuk Lahan Pertanian Terlantar di Kabupaten Karawang
Abstrak: The land plays a significant role in world life to continue its journey and fulfill living things’ needs. It becomes unarguable if the land use is then defined as the varying activities executed by humans to exploit the landscape. However, the dynamic of land use has recently caused irregularities in its original behavior. A noticeable increasing trend in farmland abandonment, directly affecting farmers’ livelihood and food security. However, there is lack study in Indonesia that describe, diagnostic, and floor the prescription to encounter the issue. Essentially, the Indonesian Central Statistics Agency has shown numbers to be able to describe farmland abandoned. However, the data does not have a spatial attribute, which in the future can result in errors in analyzing especially related to the distance. Therefore, the objectives of the study is to map farmland abandonment spatial distribution, followed by classifying the driving factors, and then the last objective is to endorse the scenario in Karawang as the second largest rice-producing district in Indonesia. Remote sensing technique by the maximum likelihood method worked to map the farmland abandoned. In addition, besides employing high resolution satellite imagery as an example data, study also manages a pattern of normalize different built-up index values to validate the quality of the sample data. Random forest analysis, as a part of machine learning, is used to sort out the importance degree of driving factors. Finally, the narrative scenario is employed to floor the prescriptive to prevent farmland abandonment issue in the future. As the result, all the districts and subdistricts in Karawang Regency have abandoned land with varying numbers and more distributed more intensely in the hub of the region. The study has discovered that the total number of farmland abandonment is 28 times of the Central Bureau Statistics has claimed. 75% producer accuracy, minimum unit data collected, terminology, land ownership, and the ability of remote sensing to read all earth reflections are the possible answer to the disparity. Machine learning informed that the top three essential variables are the irrigation service, the hillside, and the spatial plan that drives farmland abandonment. Thus, developing a new irrigation service to access the remote farmland and reviewing the spatial with more flavor to the agriculture is the scenario proposed by this study, while the hillside remains a constraint.
Keyword: Farmland Abandonment, geographic information system, land use, machine learning, regional planning, remote sensing

Judul: Analisis perubahan penggunaan lahan dalam kaitannya dengan keinginan petani untuk mempertahankan lahan pangannya di Kabupaten Karawang
Abstrak: Construction activities and population growth led to increased demand for land, while the availability of land basically unchanged. Conversion of agricultural land into other uses that are not controlled will cause a negative impact in the economic, social and environmental aspects. To overcome these negative impacts requires enormous cost. This study aims to identify the dinamic of land use change in Karawang Regency in 2001, 2006 and 2012, to analyse factors that influence land use change in Karawang, to know determinants of land sustainability of food at farmers' income levels and to identify spatial distribution of the concentration of rice area in Karawang. Data analysis used spatial analysis, binary logistic regression analysis and the G statistic analysis. Analysis of land use change results in 2001-2012 showed that the area of wetland, forest, dryland agriculture and plantations decreased 10,046.8 ha (5.22%), 2,307.8 ha (1.20%), 391.6 ha (0.20%) and 136.1 ha (0.07%), respectively . On the other hand, undeveloped land and bush increased 11,021.8 ha (5.73%), and 1,860.3 ha (0.97%). Extensive water bodies and ponds remain the same in the amount of 263.1 ha (0.14%) and 18,748.4 ha (9.75%) over the period of analysis. In general, factors that increase the chances of changes in land use in Karawang Regency in the period of 2001-2012 are the distance to the center of town, population growth and the growth of the economy. In contrast, growth variables diversity of social facilities, the establishment of regional spatial plans are strictly instrumental decrease the chances of land use change. Determinants significant sustainability of food land are tenure (rental property), the area of land owned, and the percentage contribution of agriculture to meet the needs. In 2001 there were four significant sub-districts have a large and assamble plot of land that Cibuaya, Pedes, Jayakerta and Cilebar. In 2006 and 2012 convergence with large plot only in two Kecamatan Pedes and Cibuaya. Meanwhile in the three periods of the same small plot consistently spread in the area of South Karawang includes, Pangkalan, Ciampel, Telukjambe Timur, Tegalwaru, and Klari
Keyword: paddy field sustainability., land use change, Karawang Regency, G statistics, binary logistic regression

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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