Judul: Perubahan Tutupan Lahan di Taman Nasional Bukit Barisan Nama NIM Selatan Provinsi Lampung
Abstrak: National Park is a conservation nature area which has function to protect life support system, maintain flora fauna and its ecosystem, which is managed by zonation system. The zonation can be divided into core zone, utilization zone and other based on the necessity. However, National Park is still facing problem such as illegal poaching, illegal logging, forest encroachment, and agrarian conflict to national park border. One of national park which has such kind of problem is Bukit Barisan Selatan National Park. The research is aimed at investigation of land use/land cover and its causes. After conducted the research by using GIS and interviewed some participants, the result showed that forest cover is decreased during period of 1991 to 2013. This decrease is due to forest encroachment, in which forest was converted into coffee plantation. In fact, it was happened before the National Park establishment.
Keyword: Bogor Agricultural University (IPB), land cover change., forest encroachment, Bukit Barisan Selatan national park

Judul: Pengaruh peubah sosial ekonomi terhadap perubahan penggunaan dan penutupan Lahan di Taman Nasional Gunung Halimun Salak
Abstrak: Gunung Halimun Salak is one of national park in Indonesia, located in West Java and Banten Province. In 2003, government has expanded its area by more than 70000 hectares. It caused a lot of conflicts between local communities and national park officials. Many case studies showed that the local communities has used the natural resources for construction materials, fuel wood, medicine, food, cultural needs, forages, hunting, handicraft, gold mining, agriculture land, and settlement. There was clear evidence that in Gunung Halimun Salak National Park, during 15 years period (1989-2004), forest cover area decreased by more than 25%. The objectives of the research are: 1) to identify socio-economic variables causing landuse and landcover change; 2) to estimate influence of key socio-economic variables; 3) to estimate the need of agricultural land and settlement for local communities; and 4) to estimate the direct benefit value of the national park. Selection of sampling location was used by stratified cluster sampling. Socio-economic data collected from interviews with 900 head of households which lived in 30 villages in and around the national park. The technique of data processing analysis were done using spatial analysis, descriptive analysis, linear regression analysis, population pressure analysis, and substitution and market price analysis. The result of analysis showed that the population growth, population density, land ownership, agricultural land and settlement expansion are the key variables that influenced landuse and landcover change. The need of agricultural land was 0.54 hectares per person, and the direct benefit value of the national park was more than IDR 237 billion per year.
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Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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