Judul: Analisis sikap dan kepuasan konsumen traktor tangan (studi kasus : di Kecamatan Bojongpicung, Kabupaten Cianjur Jawa Barat)
Abstrak: Ketersediaan padi di Indonesia sebagai kebutuhan pokok menjadi titik perhatian khusus dalam pemenuhan kebutuhan pangan manusia, oleh karena itu dilakukan berbagai cara untuk meningkatkan produksi padi. Salah satu cara yang dilakukan adalah penggunaan teknologi berupa traktor tangan, ketersediaan traktor tangan di Indonesia didukung oleh delapan perusahaan besar diantaranya adalah PT Kubota Indonesia dan PT Yanmar Agriculture Indonesia yang memiliki penjualan cukup baik di Jawa Barat. Penggunaan traktor tangan berlangsung di seluruh kabupaten se- Jawa Barat dan salah satunya adalah Kabupaten Cianjur dimana tingkat penggunaan dan pembelian traktor tahun 2010 merek Kubota merupakan pemimpin pasar sebesar 80 persen sedangkan Yanmar 20 persen dan hanya sebagai pengikut pasar, salah satu kecamatan yang menggunakan traktor tangan terbanyak adalah Kecamatan Bojongpicung sebesar 117 unit. Berdasarkan kondisi tersebut PT Yanmar Agriculture Indonesia perlu melakukan kajian perilaku konsumen untuk meningkatkan penjualan dan image merek Yanmar.
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Judul: Analisis Sikap, Preferensi dan Kepuasan Petani terhadap Atribut Traktor Roda Empat di Provinsi Banten dan Jawa Barat
Abstrak: Indonesia is one of the countries with a very low level of agricultural mechanization when compared to neighboring countries such as Malaysia and Thailand, where in 2015 the level of agricultural mechanization in Malaysia was 2.4 HP/ha, Thailand 2.5 HP/ha, and Indonesia 0 ,5 HP/ha. Agricultural mechani-zation in Indonesia has experienced significant growth in the last five years, this can be seen from the level of mechanization which has increased to 236 percent in 2018, which is 1.68 HP/ha. This condition occurs because of the agricultural modernization program through mechanization which continues to be carried out intensively by the Ministry of Agriculture by providing agricultural tools and machinery to farmers. Agricultural mechanization is one of the government's efforts to increase national food production and productivity. Population growth that continues to increase has an impact on the large demand for food, especially rice as a staple food in Indonesia, which continues to increase from year to year. Through the assistance program for agricultural tools and machinery, it is hoped that farmers will be able to increase their production and productivity so that farmers' welfare will increase, and food self-sufficiency will be achieved as a national one. The budget for assistance for agricultural tools and machinery continues to increase every year, especially four-wheel tractor engines which have the largest budget value due to the high price of these machines. Based on the brand, some of the four-wheel tractors that are most widely used by farmers are the Ku-bota L3800, Quick A360, and Yanmar EF393T. The increase in assistance for agricultural tools and machinery has not been in line with the increase in rice production and productivity at the farmer level. This condition can be seen from data on rice production and productivity in Indonesia, which has not increased as expected. The use of agricultural tools and machines such as four-wheel tractors by farmers has not been carried out optimally, because farmers face various chal-lenges in using these machines in the field. Demographic, social, economic and cultural conditions affect farmers' attitudes towards the agricultural tools and machines they use. The attitude of farmers regarding the attributes of the four-wheel tractor they use will be different from one another, therefore researchers want to know how the attitude of farmers towards the attributes of the four-wheel tractor they use will be known through the results of attitude analysis. This study also wants to know the preferences and satisfaction of farmers with the attributes of the four-wheel tractor they use. Based on the description above, the objectives of this study are: (1) analyzing farmers' attitudes towards the attributes of four-wheel tractors, (2) analyzing farmers' preferences for four-wheel tractors, (3) analyzing farmers' satisfaction with the attributes of four-wheel tractors. The research was conducted in two provinces, namely Banten and West Java, where the determination of the location and research respondents was car-ried out purposively. Data collection was carried out in March-May 2021, the research respondents were rice farmers who had used four-wheel tractors with the Kubota L3800, Quick A360 and Yanmar EF393T brands, a total of 120 peo-ple. The
Keyword: agricultural mechanization, conjoint, fishbein, Important Performance Analysis, product attributes

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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