Judul: Kontribusi Pengelolaan Kayu Putih Terhadap Penghasilan Rumah Tangga Pemetik Daun di BKPH Ciledug, KPH Kuningan
Abstrak: Pemetikan daun kayu putih adalah salah satu kegiatan pemanfaatan hasil hutan bukan kayu (HHBK). Kayu putih sebagai salah satu jenis hasil hutan bukan kayu (HHBK) yang dapat memberikan peningkatan ekonomi wilayah maupun nasional. Tujuan penelitian ini adalah menganalisis kontribusi penghasilan pemetikan kayu putih terhadap penghasilan total rumah tangga pemetik dan mengukur tingkat kesejahteraan pemetik kayu putih. Tingkat kesejahteraan dianalisis berdasarkan kriteria penghasilan menurut Bank Dunia dan UMK Kuningan, sedangkan tingkat kesejahteraan menurut Sajogyo berdasarkan tingkat pengeluaran per kapita per harga setara beras. Kontribusi kayu putih terhadap penghasilan total rumah tangga sebesar 85,43 %, sedangkan kontribusi non kayu putih sebesar 14,56 %. Menurut kriteria kesejahteraan Bank Dunia dan UMK Kuningan sebesar 100% pemetik kayu putih berada diatas garis kemiskinan, sedangkan berdasarkan kriteria kesejahteraan menurut Sajogyo sebesar 76,67% pemetik termasuk kategori cukup dan sebesar 23,33 % pemetik termasuk kategori hidup layak., Harvesting cajuput leaves is one of the non-timber forest product (NTFP) utilization activities. Cajuput is one of non-timber forest product that can increase regional or national economy. The purpose of this study was to analyze the income contribution form cajuput toward the pickers household income and quantify the level of pickers prosperity. The level of prosperity analysed based on income criteria to World Bank and UMK Kuningan, the level of prosperity according to Sajogyo based on the level expenditure per capita per rice equivalent price. Cajuput contribution toward the household total income of about 85,443 percent, whereas non cajuput contribution is about 14,557 percent. According to the prosperity criteria of the World Bank and UMK Kuningan about 100 percent of cajuput pickers is on above the proverty line, whereas according to Sajogyo the prosperity of about 76,67 percent cajuput pickers is on sufficiently categories and about 23,3 percent cajuput pickers is on decent living.
Keyword: Household Income, Income Contribution, Prosperity

Judul: Bauran Pemasaran Kayu Jati dan Kontribusinya Terhadap Masyarakat Sekitar Hutan di Perum Perhutani KPH Tasikmalaya
Abstrak: Pendapatan Perum Perhutani didominasi oleh penjualan kayu jati dan gondorukem. Penjualan kayu jati Perum Perhutani KPH Tasikmalaya mengalami penurunan selama masa pandemi Covid-19. Hal tersebut disebabkan kendala pemasaran di masa pandemi ini. Tujuan penelitian ini adalah: (1) Menganalisis efisiensi pemasaran kayu jati di Perum Perhutani KPH Tasikmalaya, (2) Menganalisis strategi bauran pemasaran kayu jati Perum Perhutani KPH Tasikmalaya, dan (3) Menganalisis kontribusi pemanfaatan kayu jati Perum Perhutani terhadap pendapatan total rumah tangga masyarakat sekitar hutan di KPH Tasikmalaya. Efisiensi pemasaran kayu jati dianalisis dengan menggunakan tiga indikator, yaitu margin pemasaran, farmer’s share, dan rasio keuntungan atas biaya pemasaran. Analisis strategi bauran pemasaran dan analisis kontribusi dilakukan menggunakan metode in-dept interview dengan responden serta teknik observasi. Hasil penelitian ini menunjukkan bahwa pemasaran kayu jati relatif efisien dan menguntungkan bagi produsen karena memiliki nilai farmer’s share dan rasio K/B (keuntungan terhadap biaya-biaya pemasaran) yang besar yaitu 100% dan 19.60%. Selain itu, margin pemasaran pada pemasaran kayu jati menghasilkan nilai yang sangat rendah yaitu sebesar Rp0. Penerapan strategi bauran pemasaran diimplementasikan dengan baik oleh Perum Perhutani KPH Tasikmalaya. Akan tetapi, perlu diperhatikan dalam aspek promosi yaitu perluasan sistem pemasaran melalui internet dan aspek produksi yaitu kebijakan mengenai garansi produk kayu jati. Pemanfaatan kayu jati di Perum Perhutani KPH Tasikmalaya memberikan kontribusi terhadap pendapatan total rumah tangga sebesar 32%. Kontribusi pemanfaatan kayu jati pada kegiatan PHBM hanya bersifat sebagai tambahan pendapatan saja karena secara keseluruhan pendapatan dari kegiatan non-PHBM lebih besar apabila dibandingkan dengan pendapatan dari kegiatan PHBM., Perum Perhutani's revenue is dominated by the sale of teak and gondorukem. Sales of teak wood from Perum Perhutani KPH Tasikmalaya has been decreasing during the Covid-19 pandemic. Due to some marketing constraints. The objectives of this study were: (1) to analyze the marketing efficiency of teak wood at Perum Perhutani KPH Tasikmalaya, (2) to analyze the marketing mix strategy of teak wood at Perum Perhutani KPH Tasikmalaya, and (3) to analyze the contribution of the utilization of teak by Perum Perhutani to the total household income of the community. around the forest in KPH Tasikmalaya. The marketing efficiency of teak wood is analyzed using three indicators, namely marketing margin, farmer's share, and the ratio of profit to marketing cost. Marketing mix strategy analysis and contribution analysis were conducted by in dept interview with respondents and observation techniques. This study indicate that the marketing of teak wood is relatively efficient and profitable for producers because it has a large farmer's share value and K/B ratio (profits to marketing costs), namely 100% and 19.60, respectively. In addition, the marketing margin on the marketing of teak produces a very low value of Rp0. The implementation of the marketing mix strategy is well implemented by Perum Perhutani KPH Tasikmalaya. However, it is necessary to pay attention to the promotion aspect, namely the expansion of the marketing system through the internet and the production aspect, namely the policy on teak wood product guarantees. The utilization of teak wood in Perum Perhutani KPH Tasikmalaya contributes to the total household income by 32%. The contribution of teak wood utilization in PHBM activities is only
Keyword: Analysis, Community Income, Marketing Mix, Perum Perhutani, Teak  Wood

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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