Judul: The Influence of Chief’s Leadership Style on the Efectivity of Farmer Group in Pangkal Jaya Village, Nanggung Sub-distrcit, Bogor Disctrit
Abstrak: Dalam mengelola sebuah kelompok, diperlukan seorang ketua untuk mengajak anggota mencapai tujuan bersama. Gaya kepemimpinan ketua menjadi faktor yang mempengaruhi efektivitas kelompok tani. Tujuan penelitian ini adalah menganalisis pengaruh karakteristik individu petani dan kepemimpinan ketua terhadap efektivitas kelompok tani. Penelitian ini dilaksanakan di Desa Pangkal Jaya, Kecamatan Nanggung, Kabupaten Bogor. Jumlah responden dalam penelitian ini yaitu 70 responden yang ditentukan dengan proportional random sampling. Data yang diperoleh kemudian diolah dan dianalisis menggunakan metode SEM-PLS. Hasil penelitian menunjukkan bahwa kelompok tani di Desa Pangkal Jaya memiliki tingkat efektivitas yang tinggi. Karakteristik individu secara keseluruhan memiliki pengaruh yang tidak signifikan terhadap efektivitas kelompok tani. Kepemimpinan partisipatif memiliki pengaruh yang signifikan hanya terhadap kemampuan bekerja kelompok dan kepemimpinan orientasi prestasi memiliki pengaruh yang signifikan terhadap kepuasan anggota, kemampuan bekerja kelompok, dan produktivitas kelompok., In managing a group, a leader is needed to influence members to achieve common goals. The chairman’s leadership style is a factor that influences the effectiveness of farmer groups. The aim of this research is to analyze the influence of individual farmer characteristics and the leader's leadership on the effectiveness of farmer groups. This research was conducted at Pangkal Jaya Village, Nanggung District, Bogor Regency. The number of respondents in this research is 70 respondents who were determined by proportional random sampling. The data obtained was then processed and analyzed using the SEM-PLS method. The research results show that farmer groups in Pangkal Jaya have a high level of effectiveness. Individual characteristics have an insignificant influence on the effectiveness of farmer groups.Participative leadership has a significant influence only on group work ability and achievement-oriented leadership has a significant influence on member satisfaction, group work ability and group productivity.
Keyword: farmer group, group effectiveness, leadership style

Judul: Hubungan Gaya Kepemimpinan Terhadap Efektivitas Kelompok (Kasus: Kelompok Tani Mekarsari, Desa Purwasari, Kecamatan Dramaga, Kabupaten Bogor)
Abstrak: Revitalization of Agriculture, Fisheries and Forestry (RPPK) launched by President on June 11, 2005 is as one of the Triple Track Strategy of the United Indonesia Cabinet in order to reduce poverty and unemployment and improving national economic competitiveness and preserving the resources of agriculture, fisheries , and forestry. Effective farmer groups to support the achievement of one of the Revitalization of Agriculture, Fisheries and Forestry. Appropriate leadership style in carrying out group activities support the achievement of the effectiveness of farmer groups. The purpose of this study is to describe the chairman's leadership style, identifying the factors that drive leadership style chair, analyzing the effectiveness of the group, and analyze the relationship with the chairman's leadership style effectiveness Mekarsari Farmers Group, Village Purwasari, Dramaga Subdistrict, Bogor Regency. The research was conducted in farmer groups located in the Village Mekarsari Purwasari, Dramaga district, Bogor regency. From this research can be seen that there is a relationship between individual factors with the leader's leadership style. It is also known there is a relationship between factor group with the leadership style of the group leader. In this study also can be seen that there is a relationship between leadership style group heads to the achievement of the group effectiveness.
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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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