Judul: Android Based Sugarcane Cultivation Information System Design
Abstrak: Gula merupakan salah satu bahan pokok yang memiliki tingkat kebutuhan tinggi di Indonesia. Ketersediaan gula di Indonesia belum mencukupi kebutuhan nasional. Salah satu bahan pembuatan gula adalah tebu. Produksi tebu sebagai bahan pembuatan gula yang maksimal pada tingkat desa dapat membantu pemerintah dalam memenuhi kebutuhan gula nasional. Produksi tebu yang maksimal dapat dipenuhi dengan melakukan manajemen data lahan tebu pada tingkat desa. Penelitian ini bertujuan untuk merancang sistem informasi berbasis android pada budidaya tebu tingkat desa yang dapat memaksimalkan manajemen data lahan tebu. Tahapan penelitian ini terdiri dari identifikasi masalah, analisis sistem, desain sistem, implementasi sistem, dan pengujian sistem. Penyususnan basis data menggunakan bahasa pemrograman terstruktur pada webhost untuk menyusun basis data, relasi antar data, dan akses pengguna. Sistem informasi budidaya tanaman tebu berbasis android telah diimplementasikan berbasis android dan telah diuji sistem. Berdasarkan uji sitem aplikasi ini dapat menampilkan informasi berupa data pengguna, data lahan, data pengolahan lahan, data pemupukan, data panen, dan data penjualan bekerja dengan baik., Sugar is a staple that has a high level of need in Indonesia. The availability of sugar in Indonesia is not sufficient for national needs. One of the ingredients for making sugar is sugar cane. Sugar cane production as a material for making maximum sugar at the village level can assist the government in meeting national sugar needs. Maximum sugarcane production can be met by managing data on sugarcane fields at the village level. This study aims to design an Android-based information system for sugarcane cultivation at the village level that can maximize sugarcane land data management. The stages of this research consist of problem identification, system analysis, system design, system implementation, and system testing. Database development uses structured query language on the webhost to compile databases, relationships between data, and user access. An Android-based information system for sugar cane cultivation has been implemented based on Android and the system has been tested. Based on the system test, this application can display information in the form of user data, land data, land processing data, fertilization data, harvest data, and sales data.
Keyword: android, information system, sugarcane cultivation

Judul: Web-Based Sugarcane Geographic Information System for Farmers at Village Level
Abstrak: Tebu adalah komoditas penting di Indonesia, namun manajemen data lahan tebu pada level petani di desa sangat sulit dilakukan. Sistem Informasi Geografis (SIG) berbasis web diperlukan oleh pemerintah desa dan petani untuk mengelola dan memantau budidaya tebu. Penelitian ini bertujuan untuk membangun SIG petani tebu berbasis web pada level desa yang dapat diakses secara daring. Tahapan penelitian ini terdiri dari persiapan, identifikasi lahan, penyusunan basis data, permodelan sistem, desain web mapping, pembuatan desain interface, validasi dan penyajian. Penyusunan basis data menggunakan menggunakan MySQL untuk menyusun basis data, tabel, bidang, atau fields, relasi, indeks, dan pengguna. SIG petani tebu berbasis web telah diimplementasikan berbasis web dan diuji kepada pengguna di Desa Bedug, Kabupaten Kediri. Berdasarkan uji usabiity dan pengolahan data dengan skala likert terhadap 35 responden yang terdiri dari pengguna, admin dan pemerintah desa diperoleh nilai kelayakan 77.6., Sugarcane are important agriculture commodity in Indonesia. However, manage the sugarcane information in farmers level in village are difficult. WebBased Geographical Information System (GIS) is important to manage and monitor Sugarcane productions in farmer’s level. The aim of this study was to develop webbased GIS for sugarcane farmers in village level. The methodology was used in this research consist of preparation, land identification, database construction, system modelling, web mapping design, user interface design, validation, and delivery. Database was developed using MySQL to construct table, entity relations, indeks and user. GIS was implemented in web based and tested by users in Bedug Village, Kediri Regency, East Java, Indonesia. The result of the usability index from 35 respondents (user, admin and village administrator) was 77.6.
Keyword: database, program test, sugarcane farmer, usability test, web-based GIS

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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