Judul: Efektivitas Pengawetan Kayu pada Industri Mebel di Kabupaten Jepara
Abstrak: Furniture industry in Jepara Regency using juvenile wood and fast-growing timber species as raw material because of the limited supply from natural forest. Preservation is applied in the production process to protect from wood destroying organism attacks like termites that are easier to attack juvenile wood. The objective of this research was to determine the effectiveness of preservative that applied in furniture industry Jepara Regency against subterranean termites (Coptotermes curvignathus) attacks. The preservative contain active permethrin, chlorpyrifos, and a solution of hydrogen peroxide. Preservation methods used were brushing and soaking methods. Termites testing in laboratory scale method that used according to JIS K 1571-2004 standard. The results indicated that preservative used very effective to improve wood durability against subterranean termites (Coptotermes curvignathus) attacks. The effectiveness was shown by the average of preservation treatments samples were significantly different from the control sample at the 95% level for mortality, weight loss, and feeding rate termites. The average of retention of wood preservation in Jepara furniture industry was 4.69 kg/m3 it was still below the minimum standard of SNI 03-5010.1-1999 there was 8 kg/m3 for using under roof and 11 kg/m3 for using without the roof.
Keyword: termite, wood preservation, preservative

Judul: Identifikasi Kondisi Lingkungan Kerja dan Persepsi Pekerja Industri Mebel Kayu Jati terhadap Perlindungan K3 di Kabupaten Jepara
Abstrak: The forestry sector is an activity that has a high level of risk because of work must be faced with the difficult working conditions. One of the works included in the forestry sector is the timber industry, or better known as the furniture industry. Event furniture industry consists of activities forming component (sawmill), sanding and finishing. These activities can lead to potential accidents at work if the worker does not understand the dangers that can occur from these activities, and therefore required considerable knowledge of occupational safety and health (OSH) protection to prevent accidents. This study aims to describe the working conditions and the general perception of the teak wood furniture industry workers about OSH protection in the Mulyoharjo Village Regency of Jepara. Collecting data in this study was obtained through in-depth interviews about the occupational safety and health protection against 90 respondents were included in the category of workers with the types of activities such as the formation of the components (sawmill), sanding and finishing. The results obtained in this study showed a dangerous working conditions with physical and chemical factors values above threshold value and the presence of significant difference between the value of self-assessment and control value-based assessment in which respondents are overestimates and has a poor level of knowledge.
Keyword: working conditions, occupational health and safety, industry

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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