Judul: Pola Penggunaan Radio Komunitas untuk Pemenuhan Kebutuhan Informasi Petani
Abstrak: Farmer’s community radio is organized by, from, and for farmer community, expected can be exist as an institution of broadcasting that be able to fulfill their information needs. It can be achieved when its existence is utilized by community members who are joined in the establishment of the community radio. The aims of this research are to analyze the usage pattern of community radio in fulfillment the farmer information needs, and to analyze the fulfillment rate of farmer information needs through community radio. This research was designed as a correlational descriptive survey i.e. the research that was described the farmer action in using the community radio, analyzed and explain the factors related to the usage patterns. Research was conducted in December 2012 – May 2013, to Radio Remaja and Radio Whisnu listeners. The size of sample was 25 % of each listener’s community. Hypothesis test used Spearman Rank correlation and Chi Square. The results showed that 42% of respondents have listening frequency very high, and 31% of respondents have listening duration to the community radio was high, while their participation was low. The most popular program was the entertainment program and interspersed with information, such as Selamat Pagi Petani and Latar Pantura. The factors that significantly correlated with the usage pattern of community radio were age, education level, farming status, and ownership of the mass media. There was 98% of respondents selected information about the experience of fellow farmers as a motive that drive them in listening to community radio. The rate of fulfillment information farmer needs through community radio is high. There were 60% of respondents declared that the obtaining information through community radio was adapted to their needs.
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Judul: Hubungan Perilaku Komunikasi dengan Pemahaman Petani terhadap Fungsi Radio Komunitas (Kasus Radio Komunitas Petani Trisna Alami Desa Kaliagung, Kecamatan Sentolo, Kabupaten Kulon Progo, Provinsi D.I Yogyakarta).
Abstrak: Community radio plays role as advocate of social change at the community level. “Trisna Alami” community radio was one kind of radio-based or sector-specific issues, that was built by a community from the same interests about agricultural issues. Typology of Trisna Alami community radio listeners consist of the selective and a passive listener. Trisna Alami community radio broadcasted agricultural information and entertainment. The functions of community radio are not only as an entertainer and educators, but also as community empowerment. Communication behavior in this research were: interpersonal channels exposure, cosmopoliteness, contact with extension agent, the other mass media exposure, and community radio exposure. The purposes of this research were to investigate and analyze the relationship between communication behaviors and farmers understanding of the community radio’s function. The research was designed by explanatory type. The sample in this research has done by simple random sampling. The total respondents were 40 persons. Respondents was chosen by judgement sampling. Techniques of data collection were using questionnaires, interviews, and observation. The result of this research showed that community radio’s exposure consist of frequency and duration of Trisna Alami Community Radio listened connected with farmer’s understanding the functions of community radio such as: an internal communication, public education and religious facilities, and also public sphere. The indicators of communication behaviors were not all connected with the third function of community radio.
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Judul: Ti-6Al-4V Terlapis Hidroksiapatit-Gelatin menggunakan Metode Dip-Coating Termodifikasi sebagai Implan Tulang
Abstrak: Titanium dan paduannya telah digunakan secara luas sebagai implan tulang. Akan tetapi, logam memiliki sifat adhesi yang buruk dan ketahanan korosi yang rendah sehingga diperlukan suatu pelapisan dengan material biokompatibel seperti hidroksiapatit (HAp). HAp yang akan dilapiskan pada logam harus memiliki ukuran pori yang kecil sehingga perlu dikompositkan dengan gelatin terlebih dahulu untuk menurunkan ukuran porinya. Oleh karena itu, tujuan dari penelitian ini adalah melapiskan HAp-gelatin pada paduan logam Ti-6Al-4V menggunakan metode dip-coating termodifikasi dan mencirikannya. Komposit HAp-gelatin 30% yang disintesis dengan metode in-situ dapat disalutkan pada paduan logam Ti-6Al-4V dengan metode dip-coating termodifikasi, yaitu dengan perendaman selama satu pekan. Sebelum dilapiskan logam Ti-6Al-4V dipotong menjadi kepingan bulat berdiameter 1.3 cm dengan tebal 3 mm. Kemudian logam dihaluskan, dicuci dengan etanol lalu akuades. Setelah itu, logam direndam dalam larutan NaOH yang diikuti dengan pembilasan dengan akuades. Implan Ti-6Al-4V-HAp-gelatin yang dihasilkan memiliki sifat ketahanan korosi yang lebih baik daripada logam Ti-6Al-4V yang tidak dilapis karena laju korosinya menurun dari 0.4152 mpy menjadi 0.2369 mpy. Ti-6Al-4VHAp- gelatin memiliki kekuatan mekanik yang baik karena hanya mengalami penurunan kekerasan sebesar 0.67% setelah dilapis. Implan juga dapat merangsang mineralisasi pada tulang melalui pelepasan ion Ca2+ dan terjadi pengendapan terlihat dari penurunan konsentrasi ion terlarutnya hingga 98.65%. Namun, Ti-6Al-4V-HAp-gelatin bersifat toksik di dalam sel endotel pada pengujian secara in-vitro. Hal ini disebabkan terlepasnya lapisan komposit HApgelatin yang menyebabkan sel endotel tertindih dan mengakibatkan kematian sel hingga 94.87%. Hasil analisis pola difraksi sinar-X pada Ti-6Al-4V-HAp-gelatin menunjukkan fase HAp dan Ti. Analisis spektrum inframerah menunjukkan keberadaan gugus fungsi hidroksil dan fosfat yang berasal dari HAp, karbonil dari gelatin, dan gugus karbonat yang berasal dari CaCO3 yang masih tersisa dalam sampel. Pemindaian elektron memperlihatkan morfologi Ti-6Al-4V-HAp-gelatin berbentuk granula-granula dan ukurannya beragam karena fasenya yang amorf. Sebagai saran, perlu diuji lebih lanjut metode pelapisan HAp-gelatin pada logam Ti-6Al-4V yang dapat menghasilkan penempelan yang lebih baik.
Keyword: dip-coating, gelatin, hidroksiapatit, implan, Ti-6Al-4V