Judul: Mobile Application for Monitoring Feed and Weight  Gain of Cattle Using Flutter
Abstrak: Sapi merupakan penyedia utama kebutuhan daging merah di Indonesia, dengan kontribusi signifikan terhadap kebutuhan gizi masyarakat. Berdasarkan data sektor pertanian, kehutanan, dan perikanan, kontribusi sapi potong mencapai 18 juta ekor dan sapi perah 582,2 ribu ekor pada tahun 2021, mengalami peningkatan dari tahun sebelumnya. Pemeliharaan ternak sapi di Indonesia sebagian besar dilakukan oleh peternak skala kecil dengan metode pencatatan yang belum terintegrasi secara digital. Oleh karena itu, diperlukan sistem pencatatan yang lebih praktis dan efisien. Penelitian ini bertujuan mengembangkan sebuah aplikasi mobile berbasis Flutter untuk memantau pakan dan kenaikan berat badan sapi. Aplikasi ini dirancang untuk mencatat data pakan dan berat badan sapi secara digital agar peternak dapat memantau secara lebih akurat. Penelitian ini menggunakan metode agile dengan framework Scrum yang melibatkan tahapan perencanaan product backlog, sprint planning, daily scrum, sprint review, dan sprint retrospective. Sistem pencatatan digital ini diharapkan dapat meningkatkan efisiensi dan efektivitas dalam pengelolaan ternak sapi., Cattle are the primary source of red meat in Indonesia, making a significant contribution to the nutritional needs of the population. According to data from the agriculture, forestry, and fisheries sectors, the contribution of beef cattle reached 18 million heads, and dairy cattle 582.2 thousand heads in 2021, showing an increase from the previous year. Livestock farming in Indonesia is mostly carried out by small-scale farmers with record-keeping methods that are not yet digitally integrated. Therefore, a more practical and efficient record-keeping system is needed. This study aims to develop a mobile application based on Flutter to monitor cattle feed and weight gain. This application is designed to digitally record cattle feed and weight data so that farmers can monitor it more accurately. This study uses the agile method with the Scrum framework, involving stages of product backlog planning, sprint planning, daily scrum, sprint review, and sprint retrospective. This digital record-keeping system is expected to improve efficiency and effectiveness in cattle management.
Keyword: aplikasi mobile, flutter, pencatatan ternak, pemantauan pakan

Judul: Pengembangan Aplikasi Mobile SiTernak untuk Pelaporan Kesehatan pada Hewan Ternak
Abstrak: Pelayanan informasi digital dapat menjadi salah satu upaya peningkatan pengawasan kondisi hewan ternak untuk mengantisipasi kemungkinan penurunan produksi dan kualitas hewan ternak. Akan tetapi, layanan sistem informasi bagi hewan ternak di sejumlah daerah belum dilakukan secara efisien. Di banyak daerah di Indonesia, pengawasan kondisi hewan ternak oleh pemerintah setempat masih dilakukan secara manual sehingga berakibat pada panjangnya proses pelaporan kasus kepada dinas-dinas yang melakukan tindak lanjut terhadap masalah peternakan. Hal ini menunjukkan bahwa diperlukan improvisasi dalam proses pelaporan penyakit pada ternak agar data yang didapat lebih aktual dan terpusat. Penelitian ini berhasil merancang aplikasi mobile yang berguna untuk membantu pelaporan kesehatan hewan ternak melalui fitur utama berupa pelaporan kesehatan. Dengan menggunakan Kotlin pada sisi front end dan JavaScript pada sisi back end, aplikasi memanfaatkan REST API untuk meneruskan permintaan dari sisi pengguna ke database. Pengembangan selesai dilakukan dengan menghasilkan 9 endpoint API dan melewati 18 skenario kasus dengan output sesuai dengan yang diharapkan., Digital information service can be a way to improve the livestock condition monitoring to anticipate the possibility of decreased production and quality of livestock. However, the information system services for livestock in many regions have not been implemented efficiently yet. In some regions we can find in Indonesia, the livestock condition’s monitoring process is still carried out manually by the government, causing a long process of cases reporting until it can be heard by those who take responsibilities of doing the follow-ups toward livestock’s problems (dinas). This shows that improvisation is needed in the process of acquiring disease data on livestock so that the data obtained is more actual and centralized. This research has succeeded in designing a mobile application as a tool for acquiring livestock’s health data through health reporting feature as the main feature. Using Kotlin for the client side and JavaScript for the server side, this application utilizes REST API to forward requests from the user side to the database. This development resulted 9 API endpoints and had going through 18 case scenarios with expected outputs.
Keyword: hewan ternak, mobile android, penyakit ternak, sistem pelaporan kesehatan

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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