Judul: The Effect of Partnership on Production and Income of Sugarcane Farmers in Malang Regency
Abstrak: Krebet Baru Sugar Factory has entered into a partnership with sugar cane farmers in Malang Regency. Partnerships have a role in technical services and a separate sugarcane purchasing process which causes differences in the production and income of sugarcane farmers. Therefore, this research aims to analyze the effect of partnerships on the production and income of sugar cane farmers in Malang Regency. Respondents in this study were 70 sugar cane farmers consisting of 45 partner sugar cane farmers and 25 non-partner sugar cane farmers with a sampling method, namely random sampling for partner farmers and snowball sampling method for non-partner farmers. The analytical methods used are Income Analysis and Multiple Linear Regression Analysis. The research results show that partnerships do not have a significant effect on the production and income of sugar cane farmers in Malang Regency. However, farmers who enter into partnerships have higher average values for sugarcane production per hectare and income per hectare than farmers who do not enter into partnerships., Pabrik Gula Krebet Baru telah melakukan kemitraan dengan petani tebu di Kabupaten Malang. Kemitraan memiliki peran pada pelayanan teknis dan proses pembelian tebu tersendiri yang menyebabkan perbedaan pada produksi dan pendapatan petani tebu. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh kemitraan terhadap produksi dan pendapatan petani tebu di Kabupaten Malang. Responden dalam penelitian ini berjumlah 70 petani tebu yang terdiri dari 45 petani tebu mitra dan 25 petani tebu non-mitra dengan metode penentuan sampel yaitu random sampling untuk petani mitra dan metode snowball sampling untuk petani non-mitra. Metode analisis yang digunakan yaitu Analisis Pendapatan dan Analisis Regresi Linier Berganda. Hasil penelitian menunjukkan bahwa kemitraan tidak berpengaruh secara signifikan terhadap produksi dan pendapatan petani tebu di Kabupaten Malang. Selain itu, petani yang melakukan kemitraan memiliki nilai rata-rata yang lebih tinggi pada produksi tebu per hektare dan pendapatan per hektare dibandingkan petani yang tidak melakukan kemitraan.
Keyword: kemitraan, tebu, produksi, pendapatan, regresi linier berganda, partnership, sugar cane, production, income, multiple linier regression

Judul: Analysis of Sugarcane Farmer's Satisfaction to the Partnership with Krebet Baru Sugar Factory
Abstrak: Persaingan PG Krebet Baru untuk mendapatkan bahan baku Tebu Rakyat semakin ketat. Kemitraan dengan Petani Tebu Rakyat menjadi strategi utama PG Krebet Baru untuk memenuhi kebutuhan produksi setiap tahunnya. Tujuan penelitian ini adalah untuk mengetahui pola kemitraan PG Krebet Baru dan menganalisis tingkat kepuasan Petani Tebu Rakyat mitra terhadap kemitraan dengan PG Krebet Baru. Responden penelitian berjumlah 40 orang Petani Tebu Rakyat mitra. Pengambilan data menggunakan metode purposive sampling. Pola kemitraan PG Krebet Baru adalah semi-inti-plasma. Secara keseluruhan, analisis kepuasan dengan indikator skor Customer Satisfaction Score (CSAT) menunjukkan bahwa kepuasan Petani Tebu Rakyat terhadap kemitraan PG Krebet Baru termasuk ke dalam kategori tingkat kepuasan tinggi. Tingkat kepuasan tertinggi terdapat pada aspek kemampuan komunikasi interpersonal dan kedekatan emosional pendamping dan aspek kemudahan dalam menghubungi dan menemui pendamping. Sebaliknya, terdapat 2 aspek yang masuk ke dalam CSAT kategori kepuasan tingkat rendah, yaitu aspek transparansi informasi terkait harga dan rendemen, dan aspek kesesuaian harga jual hasil panen tebu., The competition for obtaining raw materials for sugarcane is intensifying for PG Krebet Baru. Partnering with sugarcane farmers is the main strategy of PG Krebet Baru to meet its annual production needs. This study aimed to determine the partnership pattern of PG Krebet Baru and to analyze the level of satisfaction among sugarcane farmer partners on this partnership. The research respondents consisted of 40 purposively choose sugarcane farmer partners reveals that the partnership pattern of PG Krebet Baru is semi-plasma core. Overall, a CSAT score indicates that the satisfaction of sugarcane farmers to the partnership with PG Krebet Baru falls into the high satisfaction category. The highest satisfaction was observed in the aspects of interpersonal communication skills and emotional closeness with the companion, as well as the ease of contacting and meeting the companion. In contrast, there are two aspects fall into the low-level satisfaction category: transparency of price and yields information and the suitability of the selling price of the sugarcane harvest.
Keyword: partnership, sugarcane, CSAT, partnership satisfaction

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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