Judul: Keterdedahan dan Pemanfaatan Informasi oleh Petani Sayuran
Abstrak: Konsep pembangunan pertanian semakin berkembang menuju pertanian modern seiring dengan perkembangan ilmu pengetahun dan teknologi (IPTEK) dalam bidang teknologi dan manajemen pertanian yang didukung oleh perkembangan teknologi komunikasi yang sangat cepat. Pada masyarakat pertanian saat ini, informasi menjadi bagian yang signifikan bagi usahataninya. informasi berperan dalam mendukung tujuan usahatani petani untuk meningkatkan efektifitas dan efisiensi proses usahatani, mendukung pengambilan keputusan, serta mendukung inovasi untuk berkembang. Tujuan dari penelitian ini adalah menghasilkan (1) Deskripsi keterdedahan petani sayuran terhadap sumber-sumber informasi; (2) Analisis hubungan antara karakteristik petani dengan keterdedahan sumber informasi; (3) Analisis hubungan antara keterdedahan sumber informasi dengan pemanfaatan informasi. Penelitian didesain sebagai penelitian survei yang bersifat deskriptif korelasional yang dilaksanakan di Desa Tugu Selatan, Kecamatan Cisarua, Kabupaten Bogor. Menggunakan teknik random sampling. diperoleh 50 petani. Analisis data untuk mengetahui hubungan antar peubah menggunakan rank spearman (rs). Hasil penelitian menunjukkan bahwa Petani dalam mengakses sumber informasi rata-rata 2 kali dalam satu bulan. Petani dalam mengakses informasi yang tertinggi kelompok tani dan penyuluh. Petani banyak memperoleh ragam materi dari penyuluh dan kelompok tani. Pemanfaatan informasi yang terbanyak adalah motivasi dan pemecahan masalah yang bersumber dari kelompok tani dan penyuluh. Umur berhubungan nyata dengan frekuensi mengakses informasi dari penyuluh, pengalaman berhubungan nyata dengan frekuensi dan durasi mengakses informasi yang bersumber dari penyuluh, pengalaman berhubungan sangat nyata dengan peubah mengakses informasi yang bersumber dari kelompok tani, pengalaman berhubungan nyata dengan durasi mengakses informasi yang bersumber dari kelompok tani. Frekuensi, durasi dan jenis ragam materi yang bersumber dari penyuluh dan kelompok tani berhubungan sangat nyata dengan pemanfaatan informasi oleh petani. frekuensi mengakses informasi dari surat kabar berhubungan nyata dengan pencerahan. Frekuensi mengakses informasi dari majalah dan brosur berhubungan nyata dengan pencerahan, pemecahan masalah, konfirmasi, proyektif dan motivasi. Durasi mengakses informasi yang bersumber dari surat kabar berhubungan positif dengan pencerahan., The concept of agricultural development towards modern agriculture keeps growing along with the development of science and technology in the field of farming technology and management, supported by the fast development of communication technology. In the current agricultural community, information becomes a significant part since it plays a vital role in supporting farmers to improve the effectiveness and efficiency of farming processes, decision making, and innovation to flourish. The aims of this study were (1) to describe vegetable farmers exposure to information sources, (2) to analyze the relationship between the characteristics of farmers and exposure to information sources, and (3) to analyze the relationship between exposure to information sources and the utilization of information sources. This research, which was conducted in Tugu Selatan village, Cisarua Sub-district, Bogor Regency, was designed as a descriptive-correlational survey using a simple random sampling obtained from 50 farmers. The data analysis to determine the relationship between variables used Spearman rank (rs). The research result showed that the farmers accessed information sources on the average of 2 times in a month. The farmer groups and extension officers were the highest in accessing information sources. The farmers gained various materials from extension officers and farmer groups. The highest information utilization was motivation and problem solving from the farmer groups and extension officers. Ages were significantly
Keyword: Keterdedahan Sumber Informasi, Pemanfaatan informasi, Petani sayuran, Information sources, farmer groups, Cyber extension

Judul: Utilization of information by the vegetable farmers (Case of Ciaruteun Ilir Village, Cibungbulang Subdistrict, Bogor Regency, West Java Province)
Abstrak: Utilization of vegetable farming informations is one of important matter for the farmers in practicing a variety of information relating to farming of vegetables obtained from different types of information sources, including land-use pratices, regular irrigation, seed selection, fertilization, pest eradication and crop diseases, post-harvest processing , marketing and other information relevant to vegetable farming. This study objectives were (1) To analyze the utilization of information by the vegetable farmers, (2) To analyze relationship characteristics of vegetable farmers to the level of exposure to sources of information, (3) To analyze relationship of perception of farmers to agricultural services with the level of exposure to sources of information; and (4) to analyze relationship between the level of exposure to sources of information to the level of utilization of information. The number of samples was 50 vegetable farmers. The important results showed (1) The utilization rate of farm information in most vegetable growers (54 percent) were categorized as being the average of one to two information practices, (2) There is significant correlation between characteristic of vegetable farmers to levels of exposure sources information those are age, education, income, experience of vegetable farming, the number of dependents and the perception of farmers towards agriculture (affective dimension) by the number of information sources, (3) There is significant correlation between the vegetable farmer perceptions of agricultural services to the levels of exposure to multiple sources information that is the perception of farmers to extension agents, farmers, merchants and traders of agricultural production, (4) There is significant correlation between the rate exposure to sources of information that is the number of sources of information and variety of information obtained from various sources of information to the level of utilization of informations
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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