Judul: Application Development of Determination of Organic and Inorganic Fertilizing Doses on Red Chili (Capsiccum annuum L.) plants based on Android Offline
Abstrak: Pupuk adalah salah satu faktor penting pada budidaya tanaman untuk menentukan jumlah hasil panen. Aplikasi pupuk organik dapat digunakan ke berbagai tanaman hortikultura seperti pada cabai merah. Cabai merah organik memiliki nilai lebih tinggi di mata masyarakat karena dibudidayakan secara organik dan dapat dijual dengan harga lebih tinggi. Aplikasi pemupukan cabai berbasis Android ini digunakan untuk mengelola penggunaan pupuk organik maupun anorganik berdasarkan jenis tanah dan kondisi kesuburan tanah serta menghitung kebutuhan kapur berdasarkan tingkat keasaman tanah. Aplikasi ini dapat berjalan secara offline sehingga tidak memerlukan koneksi internet setelah aplikasi di instal. Aplikasi ini dibangun menggunakan bahasa C# dalam platform Xamarin yang disediakan dalam program Visual Studio., Fertilizer is one of the crucial factor in determining the quantity of harvest in cultivation. Application of organic fertilizer can be used in a variety of crops like in red chili. Organic red chili have a higher value in the public eyes and can be sold at a higher price. The purpose of Android-based chili fertilizer application is to manage the use of organic and inorganic fertilizer based on the type of soil and soil fertility condition while also able to calculate calcification requirement based on the level of acidity. This application can be operated while offline, therefor it doesn’t require an internet connection after the application is installed. This application is built using C# language in Xamarin platform provided in Visual Studio program.
Keyword: Android, Cabai, Pupuk, chilli, fertilizer, inorganic, offline, organic

Judul: Pengembangan Aplikasi Mobile Cross-Platform Budidaya Cabai Merah (Capsicum annuum L.)
Abstrak: Today there are many farmers are aware of the internet to search and obtain relevant information for their work using a mobile device. The development of information and mobile-based communication technologies has been accelerating, making the availability of various operating systems on mobile devices such as smartphones, tablets, and gadgets that make it difficult for users when the website that is accessible made only for particular platforms. This research aims to develop mobile application cultivation of red peppers that can be run on multiplatform (cross-platform) mobile devices. The research of this study is a mobile application that is able to adapt in variety of browser operating system on mobile device platforms with a screen resolution size different, using HTML5 and CSS3 techniques. Functional features which have been developed in the system include choosing the chili pepper variety, chili cultivation which includes determination of fertilizer dosage, pest and deasese handly, cultivation knowledge, post-harvest. Module outside of cultivation include farming bussiness analysis, forecasting weather, government policies, and chili pepper price information. Based on the compatibility test is in three native platform browsers (iOS, Android and Windows Phone) at the level of resolution of different screen sizes that can consistently run well.
Keyword: Bogor Agricultural University (IPB), red chilli, mobile application, cross-platform application

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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