Judul: The Influence of Land Size and Performance of Partnership Assistance on Sugarcane Farming Income (Case Study of PG Jatitujuh Partner Farmers).
Abstrak: Pabrik Gula Jatitujuh menjalin kemitraan dengan petani di Desa Sumber Kulon. Petani mengelola lahan dengan berbagai luasan. Adanya ketentuan dan pendampingan kemitraan menyebabkan perbedaan pendapatan pada pendapatan petani tebu. Oleh karena itu, penelitian ini bertujuan untuk menganalisis pengaruh luas lahan dan kinerja pendampingan kemitraan terhadap pendapatan. Data yang digunakan adalah data sekunder tahun 2022. Metode analisis yang digunakan yaitu analisis pendapatan, uji anova, analisis regresi linear berganda, analisis standar deviasi, dan koefisien variasi. Hasil penelitian menunjukan bahwa terdapat perbedaan pendapatan pada kelompok luas lahan. Selain itu, kemitraan yang dijalankan oleh PG belum sesuai dengan SOP (Standard Operating Procedure) dari kementrian pertanian., Jatitujuh Sugar Factory has established partnerships with farmers in Sumber Kulon Village. Farmers manage lands of various sizes. The existence of partnership provisions and assistance results in differences in income for sugarcane farmers. Therefore, this study aims to analyze the effect of land area and partnership assistance performance on income. The data used are secondary data from 2022. The analysis methods used are income analysis, ANOVA test, multiple linear regression analysis, standard deviation, and coefficient of variation. The results of the study show that there are differences in income among different land area groups. In addition, the partnerships run by the sugar factory are not in accordance with the Standard Operating Procedure (SOP) of the Ministry of Agriculture.
Keyword: anova, Kinerja, pendapatan, regresi berganda, tebu

Judul: Analysis of Sugarcane Farmers' Satisfaction to the Partnership with PT PG Rajawali II Jatitujuh Unit
Abstrak: Penerapan kemitraan antara PT PG Rajawali II Unit Jatitujuh dengan petani tebu menjadi dasar dari penilaian kepuasan petani terhadap kemitraan. Penelitian ini bertujuan menganalisis karakteristik usahatani dan petani mitra, menganalisis pola kemitraan, mengukur tingkat kepuasan petani tebu terhadap kemitraan PG Jatitujuh, dan merumuskan implikasi manajerial. Metode yang digunakan adalah analisis deskriptif, crosstab, Importance Performance Analysis (IPA), dan Customer Satisfaction Index (CSI). Karakteristik usahatani dan petani mitra dianalisis berdasarkan usia, jenis kelamin, tingkat pendidikan, jumlah tanggungan keluarga, luas areal lahan, pekerjaan di luar bertani tebu, lama bermitra, dan alasan petani mengikuti kemitraan. PG Jatitujuh menerapkan sistem pola inti plasma dalam kemitraan dengan petani. Hasil analisis IPA, atribut prioritas utama yaitu penanganan hama dan penyakit serta transparansi pemberian sharing. Skor CSI 73,85% menyatakan petani puas dengan kemitraan yang berjalan dengan perbaikan dalam segi pengawasan, komunikasi, dan bimbingan secara langsung kepada petani., The implementation of the partnership between PT PG Rajawali II Unit Jatitujuh and sugarcane farmers is the basis for assessing farmer satisfaction. This research aims to analyze the characteristics of farmers, analyze the partnership patterns, measure the level of satisfaction of sugarcane farmers with the PG Jatitujuh partnership, and formulate managerial implications. The methods used are descriptive analysis, crosstab, Importance Performance Analysis (IPA), and Customer Satisfaction Index (CSI). The characteristics of farmers were analyzed based on age, gender, education level, number of family dependents, land area, another job besides sugarcane farming, length of farmers joining the partnership, and reasons why farmers joined the partnership. PG Jatitujuh implements a plasma core pattern system in collaboration with farmers. The results of the IPA analysis show that the main priority attributes are pest and disease management and transparency in sharing. A CSI score of 73.85% states that farmers are satisfied with the ongoing partnership with improvements in supervision, communication, and direct guidance to farmers.
Keyword: IPA, CSI, kemitraan, tingkat kepuasan, partnership, PG Jatitujuh, satisfaction level

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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