Judul: Pengetahuan, Sikap, dan Tindakan Petani Sayuran dalam Penggunaan Pestisida di Kecamatan Batur, Kabupaten Banjarnegara
Abstrak: The use of pesticides in vegetables is done intensively. One strategy in order to reduce the use of pesticides is by implementation of the concept of Integrated Pest Management (IPM) which it has been introduced by government through the Integrated Pest Management Field School (IPMFS). This study aimed to identify differences in knowledges, attitudes, and practices IPMFS and non IPMFS farmers in the use of pesticides, as well as the relation to the characteristics of the farmers. The research data obtained directly by interviews using a structured questionnaire in seven villages in District of Batur, with 105 IPMFS farmers and 105 non IPMFS farmers from February to April 2013. The data was then analyzed using the Mann-Whitney test and chi-square. The results show that there is a difference between knowledges, attitudes, and practices at IPMFS and non- IPMFS farmers, and have relationship with each other. Knowledges and attitudes of non IPMFS farmers, as well as the attitudes of IPMFS farmers have a relationship with the farmer education, while practices IPMFS farmers have a relationship with the land ownership status and total income
Keyword: non IPMFS, IPM, IPMS

Judul: Pengetahuan, Sikap dan Tindakan Petani Padi dalam Penggunaan Pestisida di Kabupaten Indramayu Jawa Barat
Abstrak: Pests and diseases of rice are one of the biotic stresses that are able to reduce rice production. Knowledge of the population dynamics of pests is the first step in makingstrategy of insect pest control that should be effective, efficient, and environmentally friendly. Integrated Pest Management (IPM) is a pest management system based on an understanding of the population dynamics and the environment of a pest species, using a variety of compatible control techniques to keep pest populations below the economic threshold and to prevent the population to achieveeconomic injury level. Theobjective of the study wasto know the knowledge, the attitude, and the actions of the IPM field school (SLPHT) andnon-SLPHT farmers. Results showed that knowledge, attitude and action of rice farmers in the use of pesticides in Indramayu district West Java were similar between SLPHT and Non-SLPHT farmers.Both farmers still intensively use pesticides, even those farmers who have attended SLPHT. Farmer characteristics, such as age, education, side job, income, and farming experience did not correlate with the use of pesticides. The use of pesticides was only influenced by habit, praticality in use, and the effectiveness of it.
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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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