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: Pola penggunaan pestisida pada tanaman bawang merah di kecamatan Ciledug, kabupaten, Cirebon, Jawa Barat
Abstrak: Penelitian ini bertujuan untuk (1) mengetahui pengetahuan, sikap dan tindakan petani Sekolah Lapang Pengendalian Hama Terpadu (SLPHT) dan petani non SLPHT di Kecamatan Ciledug, Kabupaten Cirebon, Jawa Barat di dalam menerapkan teknik-teknik Pengendalian Hama Terpadu (PHT) pada tanaman bawang merah, (2) menganalisis distribusi pestisida melalui perbandingan rantai tataniaga pestisida yang terbanyak dan sedikit digunakan oleh petani responden, serta (3) menjelaskan hubungan antara lembaga pemasaran yang terlibat dalam rantai tataniaga pestisida dimulai dari produsen (pabrik) sampai pedagang pengecer tingkat 2 (PP 2). Pemilihan desa dan lembaga pemasaran contoh dilakukan secara terpilih (purposive), sedangkan pemilihan petani responden dilakukan secara acak dari setiap desa. Desa yang dipilih dalam penelitian ini adalah Pabuaran Lor, Bojongnegara dan Babakan Losari. Jumlah petani responden sebanyak 48 orang, dimana masing- masing desa dipilih sebanyak 8 orang petani SLPHT dan 8 orang petani non SLPHT. Jumlah lembaga pemasaran pestisida yang terpilih sebanyak 15 responden yaitu 3 pedagang pengecer tingkat 2 (PP 2), 6 pedagang pengecer tingkat 1 (PP 1), 3 agen dan 3 pabrik. Rantai tataniaga pestisida yang ditelusuri adalah pestisida Dursban 20 EC (b.a. Klorpirifos), Larvin 375 AS (b.a. Tiodikarb) serta Pounce 20 EC (b.a. Permetrin). Analisis pengetahuan, sikap dan tindakan (PST) dilakukan secara deskripsi, sedangkan analisis distribusi pestisida dilakukan dengan metode survei. Hasil analisis terhadap pengetahuan petani sudah cukup baik. Hal ini terlihat dari penggunaan nozel yang tidak perlu dilonggarkan saat menyemprot (95,83%), arah menyemprot yang tidak berlawanan dengan arah angin (97,92%), penggunaan penutup mulut dan hidung saat menyemprot (77,08%), penyemprotan yang tidak boleh lagi dilakukan saat menjelang panen (62,50%) serta penyimpanan pestisida di tempat tertutup dan jauh dari jangkauan anak-anak (100%). ..dst
Keyword: bawang merah, allium ascalonicum L, botani, syarat tumbuh, persepsi petani

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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