Judul: Communication Network and Improving Coconut Farming Productivity (Case: Coconut Farmers in Central Concong Village, Concong District, Indragiri Hilir Regency, Riau)
Abstrak: Petani sebagai pengelola utama memegang peranan erat dalam keberhasilan sebuah usahatani. Keterlibatan petani dalam suatu jaringan komunikasi menandakan adanya kegiatan berbagi informasi dan proses interaksi antara petani satu dengan yang lainnya. Perilaku berbagi informasi tersebut dapat menunjang peningkatan pengetahuan, sikap dan keterampilan petani yang pada akhirnya akan meningkatan pendapatan dan kesejahteraan petani. Tujuan dari penelitian ini adalah menganalisis hubungan jaringan komunikasi terhadap peningkatan produktivitas usahatani. Penelitian ini merupakan descriptive research dengan 90 orang responden yang dipilih menggunakan metode sensus. Penelitian ini menggunakan pendekatan kuantitatif yang didukung oleh data kualitatif. Pendekatan kuantitatif menggunakan kuesioner dengan metode free recall pada jaringan komunikasi dan wawancara mendalam dalam memperoleh data kualitatif. Hasil penelitian menunjukkan terdapat hubungan yang nyata antara karakteristik individu pada aspek tingkat kekosmopolitan dengan jaringan komunikasi usahatani. Kemudian terdapat hubungan yang nyata antara jaringan komunikasi dan perilaku petani pada aspek kognitif dan terdapat hubungan nyata antara perilaku petani pada aspek kognitif dengan produktivitas usahatani., Farmers became the main managers, playing a crucial role in a farm's success. The involvement of farmers in a communication network indicates the existence of information sharing activities and the process of interaction between farmers with one another. Farmers can benefit from this information-sharing behavior by improving their knowledge, attitudes, and skills, so improving their revenue and welfare. The purpose of this study was to analyze the relationship between communication networks and increase farm productivity. This research uses a quantitative approach that is supported by qualitative data. The quantitative approach uses a questionnaire with the free recall method for the social network and in-depth interviews in obtaining qualitative data. The results of study indicate that there was a significant correlation between individual characteristics at the cosmopolitan level and the marketing communication network of farming. Then there is a significant correlation between the communication network and the behavior of farmers on the cognitive aspect and there is a significant correlation between the behavior of farmers on the cognitive aspect and farm productivity.
Keyword: communication network, farmers’ behaviors, productivity

Judul: Study of communication network in the implementation of milking hygiene and sanitation in dairy farmers’ group (case in Subdistrict of Pamulihan, District of Sumedang)
Abstrak: The main goal of dairy farming is to produce a high quality of milk which free from any residue and meet the minimum bacteria standard. One of the efforts to achieve it by doing milking hygiene and sanitation correctly. Dairy farmers need trusted and reliable information about milking hygiene and sanitation to increase the quality of milk. They established a communication network among them to meet their demand of milking hygiene and sanitation information. The research of Communication Network in the Implementation of Milking Hygiene and Sanitation in Dairy Farmers’ Group refered to the convergen communication model which defined communication as process of sharing dan creating information between communicant. The study area of communication network include the individual roles in communication network such as star, bridge, liason, cosmopolite and isolate in their group and communication network variables such as local centrality, global centrality and betweeness. The objectives of this research were: (1) to describe communication network among dairy farmers (2) to analyze the relationship between individual characteristics and dairy farming characteristics to the communication network (3) to analyze the relationship between individual characteristics and dairy farming characteristics to the implementation of milking hygiene and sanitation (4) to analyze the relationship between communication network and the implementation of milking hygiene and sanitation. The research was designed as a correlational and descriptive which used dairy farmers as unit of analysis. The research has been carried out from August to November 2012 at Desa Haurngombong and Mekar Bakti, Subway Pamulihan, Sumedang District which determined by purposive. There are 87 dairy farmers taken as sample by using sampling intact system. Data was analyzed by UCINET VI to calculate the communication network variabels index and Rank Spearman Correlation was applied to analyze the relationship among variables. The result of this research showed that : (1) communication network about milking hygiene and sanitation in Harapan Jaya farmer’s group was radial individual network but communication network with the same theme in Mekar Sari farmer’s group was interlocking individual network, (2) there was a significant relationship between farmers’ experience level, group involvement, cooperation involvement, cosmopolitant and dairy ownership to the local and global centrality, (3) There was also a significant correlation between cosmopolitant and dairy ownership with the implementation of milking hygiene and sanitation (4) there was a significant relationship between local centrality, global centrality and the implementation of milking hygiene and sanitation.
Keyword: 

Judul: Sintesis Dan Pencirian Perovskit Lantanum Manganit La0.8ba0.2(Femn)(1-Z)/2tizo3 (Z = 0.1–0.8).
Abstrak: Penelitian ini bertujuan menyintesis fase tunggal perovskit lantanum manganit La0.8Ba0.2(FeMn)(1-z)/2TizO3 (z = 0.1–0.8) sebagai bahan penyerap gelombang elektromagnetik. Metode yang digunakan adalah reaksi keadaan padat dengan menggunakan alat penggilingan energi tinggi. Material dicirikan dengan spektrofotometer inframerah transformasi Fourier, difraktometer sinar-X, mikroskop elektron payaran-spektroskopi dispersif energi, magnetometer material getar, dan alat analisis jaringan vektor. Fase tunggal terbentuk pada material dengan komposisi z = 0.2 dan 0.3. Material tersebut memiliki sifat feromagnetik yang dibuktikan oleh nilai koersivitas (Hc) 387 Oersted dan komposisi yang mendekati reaksi stoikiometri. Bentuk morfologi material bulat seragam dan memiliki ukuran 961.5 nm yang dibuktikan dengan pencirian alat penganalisis ukuran partikel. Material memiliki kemampuan menyerap gelombang elektromagnetik pada 8-12 GHz dengan absorpsi 85.55%. Material La0.8Ba0.2Fe0.35Mn0.35Ti0.3O3 telah berhasil disintesis dan memiliki kemampuan sebagai bahan penyerap gelombang elektromagnetik.
Keyword: feromagnetik, LaMnO3, penyerap gelombang elektromagnetik, perovskit