Judul: Tingkat Pengetahuan, Sikap, dan Tindakan Petani Bawang Merah (Allium cepa L.) terhadap Penggunaan Pestisida di Kabupaten Cirebon
Abstrak: Pesticide application is the most common effort by farmers to control plant pests and diseases. However, the inappropriate use of pesticides can have a negative impact on human health and the environment. This study aimed to measure the level of knowledge, attitudes, and actions of shallot farmers on the use of pesticides in Cirebon Regency. The research was conducted from January to March 2022 through interviews with a structured questionnaire guide. Respondents were selected by purposive sampling based on the population of the farmer who work as shallot farmers in four sub-districts with a total of 60 respondents. The data was processed using Microsoft Excel 2010, then analyzed by using the X2 (chi-square) test at the level of =5% and 10%. The results showed that majority of farmers use synthetic pesticides because they can control pests and diseases more quickly. The majority of farmers used insecticides with the active ingredient chlorantraniliprole, while the fungicide active ingredients used by respondent farmers were propineb and mankozeb. The results of the chi-square test showed that the participation of farmers in the Integrated Pest Management Field School (SLPHT) had a significant relationship with the knowledge and attitudes of farmers in the use of synthetic pesticides in shallot plantations. The level of education affected the attitude of farmers in decision making and had a significant relationship with the actions of farmers in the use of synthetic pesticides in shallot plantations.
Keyword: SLPHT, synthetic pesticide, questionnaire

Judul: Knowledges, Attitudes, and Practices of Mango Farmers Regarding Pesticide Use in Mango Production Centers of Cirebon District
Abstrak: Aplikasi pestisida merupakan upaya yang paling umum dilakukan petani untuk mengendalikan hama dan penyakit tanaman. Namun, penggunaan pestisida yang tidak tepat dapat berdampak negatif bagi manusia dan lingkungan. Penelitian ini bertujuan menentukan tingkat pengetahuan, sikap dan tindakan petani mangga di Kabupaten Cirebon terhadap penggunaan pestisida. Penelitian dilakukan pada Bulan Februari hingga April 2021 menggunakan metode survei langsung di lapangan melalui wawancara dengan petani mangga menggunakan kuesioner terstruktur. Lokasi pengambilan sampel ditentukan berdasarkan populasi masyarakat yang berprofesi sebagai petani mangga di kecamatan tersebut lebih banyak dibandingkan dengan di kecamatan lainnya dengan jumlah sebanyak 45 responden. Data dimasukan ke dalam Microsoft Excel 2007, lalu dianalisis secara deskriptif dan disajikan dalam bentuk tabel. Hasil penelitian menunjukkan bahwa sebagian besar petani menggunakan pestisida secara intensif dan terjadwal serta menggunakan dosis yang tidak sesuai dengan anjuran sehingga dapat menimbulkan residu pestisida. Sebagian besar petani mangga menggunakan insektisida dengan bahan aktif lambda sihalotrin dan sipermetrin, sedangkan fungisida yang digunakan adalah prokloraz dan azoksistrobin., Pesticide application is the most frequent method to control plant pests and diseases. However, improper use of pesticides can cause negative effects on both human health and the environment. This study aimed was to evaluate the knowledge, attitudes, and behaviors of mango farmers in Cirebon Regency regarding pesticide use. The study has been conducted from February to April 2021 using a direct survey method through interviews with mango farmers using a structured questionnaire. Respondents were determined based on the farmer population who work as mango farmers in the village, with a total of 45 respondents. The data was entered into Microsoft Excel 2007, then analyzed descriptively and presented in tabular form. Results showed that most of the farmers were using pesticides intensively regularly (calendar system) using doses that are not as recommended. The active ingredients of lambda-cyhalothrin and cypermethrin (insecticides) and prochloraz and azoxystrobin (fungicides) are commonly used by mango farmers.
Keyword: active ingredient, interview, pesticide application

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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