Judul: Dinamika Kelompok dan Diseminasi Informasi Urban Farming pada Kelompok Tani (Kasus di Kecamatan Pesanggrahan, Jakarta Selatan, DKI Jakarta)
Abstrak: Keterbatasan lahan merupakan salah satu permasalahan yang dihadapi oleh petani di Kecamatan Pesanggrahan, Jakarta Selatan. Oleh karena itu, terdapat upaya yang dilakukan pemerintah berupa diseminasi informasi mengenai program urban farming. Dalam menentukan keberhasilan kegiatan diseminasi informasi bergantung pada penerima informasi yaitu anggota kelompok tani. Tujuan penelitian ini yaitu untuk menganalisis hubungan dinamika kelompok dengan tingkat diseminasi informasi urban farming. Variabel dalam penelitian ini yaitu karakteristik anggota kelompok (X1), faktor-faktor dinamika kelompok (X2), dinamika kelompok (Y1), dan tingkat diseminasi informasi (Y2). Penelitian ini menggunakan tabulasi silang untuk menganalisis hubungan antar variabel. Hasil penelitian ini menunjukkan bahwa tidak terdapat korelasi antara karakteristik anggota kelompok dengan dinamika kelompok. Namun, terdapat korelasi antara faktor dinamika kelompok dengan dinamika kelompok dan dinamika kelompok dengan tingkat keberhasilan diseminasi informasi., Land limitation is one of the problems faced by urban farmers in Pesanggrahan District, South Jakarta. Therefore, there are efforts made by the government in the form of information dissemination regarding the urban farming program. In determining the success of information dissemination activities, it depends on the recipient of the information which is the member farmer groups. The purpose of this study is to analyze the relationship between group dynamics and the level of dissemination of urban farming information. The variables in this study were members characteristics (X1), group dynamics factors (X2), group dynamics (Y1), and level of information dissemination (Y2). This study used crosstab to analyze the relationship between variables. The results showed that there is no correlation between member groups characteristics and group dynamics. However, there is a correlation between group dynamics factors and group dynamics and the success rate of information dissemination.
Keyword: dissemination information, farmers group, group dynamics

Judul: Correlation between Group Dynamics and the Success Rate of Urban Farming Technology Dissemination to Farmers in Medan City
Abstrak: Permasalahan utama yang dihadapi oleh petani perkotaan adalah keterbatasan lahan, seperti halnya yang dialami oleh petani di Kota Medan. Oleh karena itu, Dinas Pertanian dan Perikanan Kota Medan melakukan kegiatan diseminasi teknologi mengenai program urban farming. Keberhasilan kegiatan diseminasi teknologi tidak hanya bergantung pada sumber dan materi informasi namun bergantung pada penerima informasi. Penelitian ini bertujuan untuk menganalisis hubungan dinamika kelompok dan tingkat keberhasilan diseminasi teknologi. Penelitian ini menggunakan metode kuantitatif melalui kuesioner yang diberikan kepada responden yang dipilih secara sensus serta didukung dengan data kualitatif yang diperoleh melalui wawancara mendalam. Pengolahan data pada penelitian ini menggunakan korelasi Rank Spearman. Hasil penelitian memperlihatkan bahwa dinamika kelompok pada dua kelompok tani tergolong dinamis dan tingkat keberhasilan diseminasi teknologi tergolong berhasil. Tidak terdapat korelasi antara karakteristik individu dan dinamika kelompok, namun terdapat korelasi yang nyata antara dinamika kelompok dan tingkat keberhasilan diseminasi teknologi., The main problem faced by urban farmers is limited land, as experienced by farmers in the city of Medan. Therefore, the Department of Agriculture and Fisheries of Medan City carried out technology dissemination activities regarding urban farming programs. The success of technology dissemination activities does not only depend on the sources and materials of information but also on the recipients of the information. This study aims to analyze the relationship between group dynamics and the success rate of technology dissemination. This study uses quantitative methods through questionnaires given to respondents selected by census and is supported by qualitative data obtained through in-depth interviews. Data processing in this study uses Spearman Rank correlation. The results showed that the group dynamics of the two farmer groups are dynamic, with the success rate of technology dissemination being high. There is no correlation between individual characteristics and group dynamics, but there is a significant correlation between group dynamics and the success rate of technology dissemination.
Keyword: farmers group, group dynamics, technology dissemination, urban farming

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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