Judul: Pengaruh Persepsi dan Motivasi Petani terhadap Pemanfaatan Kartu Tani
Abstrak: Pemerintah telah mencanangkan Program Kartu Tani untuk mengelola penyaluran pupuk bersubsidi kepada petani. Akan tetapi, sejauh ini Program Kartu Tani sebatas pada pembagian kartu saja kepada petani dan belum dimanfaatkan oleh petani. Persepsi positif dan motivasi yang kuat diperlukan agar petani mau memanfaatkan Kartu Tani. Tujuan penelitian ini adalah untuk menganalisis pengaruh persepsi dan motivasi petani terhadap pemanfaatan Kartu Tani. Penelitian ini menggunakan metode survei dengan menggunakan kuesioner sebagai alat pengumpulan data dari 60 petani pemilik Kartu Tani di Desa Pohijo, Kecamatan Margoyoso, Kabupaten Pati yang dipilih melalui teknik accidental sampling. Data yang terkumpul dianalisis menggunakan analisis regresi berganda yang menunjukkan bahwa petani mempunyai persepsi yang positif dan motivasi yang kuat dalam pemanfaatan Kartu Tani. Adapun tingkat pemanfaatan Kartu Tani berada pada kategori sedang. Penelitian ini membuktikan bahwa persepsi dan motivasi petani mempunyai pengaruh signifikan terhadap pemanfaatan Kartu Tani., The government has launched Kartu Tani Program to manage the distribution of subsidized fertilizers to farmers. But, the Kartu Tani has just been distributed to farmers and the card has not yet been utilized by farmers. Therefore, it is assumed that positive perceptions and strong motivation are needed in order farmers would take advantage of the Kartu Tani. The purpose of this study was to analyze the affect of farmers' perceptions and motivations on the Kartu Tani utilization. The study was conducted in survey methodology using questionnaire in collecting data from 60 farmers selected accidentally in Pohijo Village, Margoyoso District, Pati Regency. Data collected was analyzed using multiple regression analysis which show that farmers have positive perceptions and strong motivation in using Kartu Tani. Although the level of Kartu Tani utilization is in the moderate level. The study revealed that farmers' perceptions and motivations have a significant influence on the use of the Kartu Kartu Tani.
Keyword: motivation, use of Kartu Tani, perception

Judul: Adoption Process of Farmer Card Innovation by Rice Farmers (Case: Wates Farmer Group, Pangkal Jaya Village, Nanggung District, Bogor Regency)
Abstrak: Kartu Tani adalah sebuah kartu yang digunakan untuk menebus pupuk bersubsidi. Inovasi Kartu Tani bertujuan untuk menjamin transparansi dan akuntabilitas dalam penyaluran pupuk bersubsidi kepada petani. Namun, beberapa penelitian menunjukkan bahwa implementasi program Kartu Tani masih mengalami beberapa kendala. Desa Pangkal Jaya merupakan salah satu desa yang relatif berhasil menerapkan inovasi Kartu Tani. Tulisan ini bertujuan untuk menganalisis hubungan antara karakteristik petani, persepsi petani mengenai karakteristik inovasi, dan dukungan penyuluhan dengan proses adopsi inovasi Kartu Tani. Penelitian ini menggunakan metode survei dengan instrumen kuesioner yang didukung dengan data kualitatif yang dikumpulkan melalui wawancara mendalam. Responden dalam penelitian ini berjumlah 51 orang anggota Kelompok Tani Wates di Desa Pangkal Jaya yang dipilih menggunakan teknik simple random sampling. Hasil penelitian menunjukkan bahwa tingkat pendidikan, luas penguasaan lahan, dan tingkat pendapatan berhubungan nyata dengan tahap pengetahuan. Persepsi petani mengenai karakteristik inovasi Kartu Tani berhubungan nyata dengan tahap persuasi. Dukungan penyuluhan berhubungan nyata dengan tahap pengetahuan dan tahap persuasi., Kartu Tani is a card used to redeem subsidized fertilizer. Kartu Tani innovation aims to ensure transparency and accountability in the distribution of subsidized fertilizer to farmers. However, several studies have shown that the implementation of Kartu Tani program still faces several obstacles. Pangkal Jaya Village is one of the villages that has been relatively successful in implementing Kartu Tani innovation. This paper aims to analyze the relationship between farmer characteristics, perception of innovation characteristics, and extension support with the adoption process of Kartu Tani innovation. This research uses a survey method with a questionnaire instrument supported by qualitative data collected through in-depth interviews. Respondents in this study amounted to 51 farmer members of the Wates farmer group in Pangkal Jaya Village who were selected using simple random sampling technique. The results showed that education level, land tenure size, and income level are significantly related to the knowledge stage. Farmers' perceptions of the characteristics of Farmer Card innovation are significantly related to the persuasion stage. Extension support is significantly related to the knowledge stage and persuasion stage.
Keyword: adoption, innovation, kartu tani

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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