Judul: Penyalutan Komposit Hidroksiapatit-Kitosan pada Paduan Logam TiAlV dengan Metode Elektroforesis Deposisi
Abstrak: Implan ortopedi saat ini sering menggunakan TiAlV karena memunyai kekuatan yang tinggi, ringan serta memunyai ketahanan korosi yang sangat baik. Di samping keunggulan tersebut, TiAlV memiliki biokompatibilitas dan bioaktivitas yang rendah. Tujuan penelitian ini adalah mengompositkan hidroksiapatit dengan kitosan dan menyalutkannya pada paduan logam TiAlV dengan metode elektroforesis deposisi. Proses elektroforessis deposisi dilakukan dengan beda potensial 80 V selama 1 jam. Paduan logam yang tersalutkan diamati dengan menggunakan mikroskop elektron payaran (SEM). Hasil SEM menunjukkan bahwa telah terbentuk partikel berbentuk granula yang diyakini sebagai hidroksiapatit dan kerapatan antar granula cukup tinggi yang diyakini sebagai kemunculan kitosan. Pencirian dengan difraksi sinar-X dan spektrofotometer inframerah menunjukkan bahwa paduan logam tersebut tersalut oleh komposit hidroksiapatit-kitosan. Logam TiAlV yang tersalut oleh komposit hidroksiapatit-kitosan mengalami penurunan laju korosi dan tidak bersifat toksik terhadap sel endotel karena persen inhibisi yang hanya 35%.
Keyword: chitosan, electrophoretic deposition, hydroxyapatite, TiAlV

Judul: Pelapisan Komposit Hidroksiapatit-Kitosan Pada Paduan Logam Tial Dengan Metode Elektroforesis Deposisi
Abstrak: Aplikasi implan tulang dapat menggunakan TiAl karena biokompatibilitasnya. Namun, penggunaan dalam jangka panjang dapat membahayakan tubuh karena akan terjadi pelepasan ion logam. Untuk itu dilakukan penelitian dengan tujuan mengompositkan hidroksiapatit dengan kitosan dan melapiskannya pada paduan logam TiAl dengan metode elektroforesis deposisi (EPD). Untuk membandingkan pengaruh lamanya waktu perlakuan pada hasil pelapisan logam, metode elektroforesis dilakukan dengan interval waktu berbeda, yaitu 40 dan 60 menit dengan tegangan 200 V. Paduan logam yang telah terlapisi diamati dengan menggunakan mikroskop electron payaran (SEM). Hasil SEM menunjukkan bahwa waktu proses pelapisan selama 60 menit menghasilkan lapisan yang lebih homogen dan merata. Pencirian yang dilakukan dengan difraksi sinar-X dan inframerah menunjukkan bahwa paduan logam telah terlapisi oleh komposit hidroksiapatit-kitosan. Paduan logam TiAl yang telah terlapisi komposit hidroksiapatit-kitosan memiliki laju korosi yang lebih rendah dibandingkan dengan sebelum dilapisi oleh komposit hidroksiapatit-kitosan.
Keyword: elektroforesis deposisi, hidroksiapatit, kitosan, TiAl

Judul: Spatial Model of Developing Village Based on Road Network and Land Use in Brebes District
Abstrak: Brebes is a rural district dominated by agricultural areas. The area of Brebes Regency is 1,769.62 km2 consisting of 292 villages and 17 sub-districts. Brebes Regency is in the northern region of Central Java Province, borders West Java, and is traversed by the Pantura National Road and the Trans-Java toll road. Geographically, the location of Brebes Regency is strategic so that infrastructure development is expected to optimize geographical advantages and encourage socio-economic development. However, in fact the gross regional domestic product (GRDP) per capita in Brebes in 2022 is IDR 17.61 million lower than the average GRDP per capita in the former Pekalongan Residency districts (consisting of five districts namely Pekalongan, Tegal, Pemalang, Batang, and Brebes) amounting to IDR 22.02 million. The Human Development Index of Brebes is 67.03, the lowest in Central Java, and the poverty rate in 2022 is 16.05%, the third highest in Central Java. Another indicator in assessing the development of Brebes, according to its characteristics which are dominated by rural areas, is the Village Development Index (IDM). IDM is a village development assessment index compiled by the Ministry of Villages, Disadvantaged Regions and Transmigration. IDM is a com-posite index that assesses social resilience, economic resilience and environmental resilience. Brebes' IDM in 2022 is 0.6850 or on average they have developing village status. The value is below the Central Java’s IDM average (0.7118) and below the IDM average of the former Pekalongan Residency districts (0.6913). To overcome backwardness, it is necessary to study the spatial aspects of rural areas in Brebes Regency so that rural development can be in harmony with the spatial factors that most influence each village. The main objective of this research is to create modeling based on spatial factors in the form of road networks and land use on the level of village development in Brebes Regency. The method used is road network analysis and land use analysis, as well as regression analysis to determine the influence of the road network and land use on the IDM of Brebes Regency. The selected road network analysis is an analysis of road connectivity (alpha and beta indices), road density, and shortest route, while the land use analysis selected is an analysis of built-up land, regional compactness, and land use diversity. Both analyzes produce quantitative data which is used as an independent variable to assess village development based on IDM as the dependent variable. Correlation between variables was analyzed through geographically weighted regression (GWR) which was preceded by ordinary least squares (OLS) analysis accompanied by a com-parison of the two. The first stage of road network analysis produces an alpha index, beta index, and road network density level. The alpha index value in Brebes is in the range 0.370-0.856 with an average value of 0.455. This figure is still lower than the perfect score (α=1), which means that the road network in Brebes within the village area is not fully connected well. Meanwhile, the beta index value in Brebes is in the interval 1.682-1.944 with an average value of 1.792. This figure means that the road network
Keyword: GWR, road network, land use, village development