Judul: Kontribusi Pembinaan Usaha Kebun Karet Rakyat Terhadap Kesejahteraan Masyarakat Desa Hutan di PT. Sarpatim, Kalimantan Tengah
Abstrak: Forest Village Community Development (PMDH) is a community development to improve welfare of community who live in and surronding forest area and to prevent deforestation. This study was aimed to determine contribution of small holder rubber palantation business (KKR) to the income of the people and the relation to forest encroachment by public. The main data used are the characteristics of the respondent, the respondent's total incomes and expenditure, and data rate of forest encroachment. KKR activities conducted by PT. Sarpatim has contributed to improve the welfare of society approximately 50% of total incomes. The factors that significantly influence to farmer income from rubber business is the rubber gum production, gum collection frequency, and employment status of rubber farmers. KKR has been successful to increasing people's income, but have not been able to reduce the rate of forest encroachment by people, it could be caused by increase population and ill-defined property rigths of state forest.
Keyword: forest encroachment., welfare, KKR, PMDH

Judul: Study of the socio-economic condition of the village communities around the IUPHHK-HA PT. Sarmiento Parakantja Timber in Central Kalimantan
Abstrak: Perusahaan sebagai salah satu pelaku dalam pembangunan ekonomi, sudah selayaknya tidak hanya bertujuan memperoleh keuntungan finansial, namun juga perlu berkontribusi bagi masyarakat dan lingkungan di sekitarnya. Oleh karena itu perlu dilakukan penelitian keadaan sosial ekonomi masyarakat sekitar hutan PT. Sarmiento Parakantja Timber yang merupakan perusahaan IUPHHK-HA. Tujuan dari penelitian ini adalah mendapatkan informasi kondisi demografi, keadaan social ekonomi-budaya, mata pencaharian dan pendapatan, opini mengenai peran hutan, dan opini bentuk kemitraan dan partisipasi masyarakat dalam pengelolaan hutan. Tahapan penelitian ini terdiri dari pengumpulan data, pemilihan responden, pengolahan dan analisis data. Hasil penelitian menunjukkan perusahaan selama ini telah melakukan pembinaan terhadap masyarakat desa di sekitarnya melalui program kesehatan, pendidikan, pengembangan masyarkat, keagaman dan adat. Sosial-ekonomi masyarakat sekitar PT. Sarmiento Parakantja Timber tergolong ke dalam masyarakat sejahtera, dengan pendapatan di atas Upah Minimum Kabupaten (UMK), mata pencaharian utama adalah usaha tani ladang berpindah dan tingkat pendidikan masih rendah. Opini mengenai peran hutan 70% menyatakan fungsi hutan sebagai pencegah bencana banjir dan tanah longsor, 90% menyatakan hutan sebagai tempat untuk mengambil kayu dan hasil hutan lainnya. Opini bentuk kemitraan dan partisipasi masyarakat dalam pengelolaan hutan adalah sangat baik., The company as one of the actors in economic development, should not only aim to obtain financial benefits, but also needs to contribute to the community and the surrounding environment. Therefore, it is necessary to conduct research on the socio-economic conditions of the community around the PT. Sarmiento Parakantja Timber which is an IUPHHK-HA company. The purpose of this study was to obtain information on demographic conditions, socio-economic-cultural conditions, livelihoods and incomes, opinions on the role of forests, and opinions on forms of partnership and community participation in forest management. The stages of this research consist of collecting data, selecting respondents, processing and analyzing data. The results of the study show that the company has been providing guidance to the surrounding village communities through health, education, community development, religion and custom programs. Socio-economic community around PT. Sarmiento Parakantja Timber belongs to a prosperous society, with income above the Regency Minimum Wage (UMK), the main livelihood is shifting farming and the level of education is still low. Opinion on the role of forests 70% stated the function of the forest as preventing floods and landslides, 90% stated the forest as a place to collect wood and other forest products. The opinion of the form of partnership and community participation in forest management is very good.
Keyword: Aspirasi dan Opini, Masyarakat, Sosial-ekonomi, aspirations and opinions, society, socio-economy

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.
Keyword: