Judul: Sistem pakar Fuzzy untuk diagnosis penyakit pada tanaman cabai merah
Abstrak: Chili plant is one plant that has high economic value for farmers in Indonesia. The risk of plants that have high economic value was also high. Production of the national average chili plants is still not maximized. One reason is the number of pests and pathogens that can attack chili plants and cause plants can not grow optimally. This study developed an expert system that uses the concept of Fuzzy Inference System with Mamdani method to diagnose disease in chili plants. This system can provide early diagnosis of diseases affecting the chili plant from the symptoms caused without having to ask directly to the specialist or expert. The parameters used as input parameters consist of fuzzy and non-fuzzy parameters. Fuzzy parameters such as leaf color, the color or pattern of leaf spot, leaf spot diameter, number of leaf spot, stem color, pH, and moisture. The non-fuzzy parameters used are the location of plant, leaf condition, position of leaf spot, stem rottenness, spots on the stems, bumps on the stem, blackish brown ring at the base of the stem, and dead shoots. The results showed that the Fuzzy Inference System can be used as a way to cope uncertainty for the case of chili plant disease diagnosis.
Keyword: 

Judul: Sistem pakar untuk identifikasi penyakit tanaman cabai besar merah (Capsicum annuum L.)
Abstrak: Tanaman cabai besar merah (Capsicum annuum L.) cukup rentan terhadap penyakit sejak dalam bentuk benih sampai tanaman tersebut menghasilkan buah. Serangan penyakit dapat menimbulkan kerugian dalam kualitas maupun kuantitas. Untuk meminimalkan kerugian tersebut maka serangan penyakit perlu dikendalikan secara tepat dan cepat sesuai dengan jenis penyakitnya. Identifikasi jenis penyakit beserta tindakan pengendaliannya dapat dilakukan oleh orang yang telah berpengalaman hanya dengan memperhatikan gejalanya saja. Kemajuan sains dan teknologi komputer saat ini memungkinkan kemampuan seorang yang berpengalaman tersebut dipindahkan ke sebuah perangkat lunak komputer yang disebut sistem pakar. Penelitian ini bertujuan untuk membangun suatu alat bantu (tool) berupa sistem pakar yang dapat digunakan untuk mengidentifikasi penyakit yang menyerang tanaman cabai besar merah (Capsicum annuum L.) pada berbagai tahap pertumbuhan. Sistem pakar ini diharapkan dapat dimanfaatkan oleh para petani, penyuluh pertanian, Pengamat Hama dan Penyakit (PHT) serta Laboratorium Pengamatan dan Peramalan Hama dan Penyakit Tanaman Pangan dan Hortikultura (Laboratorium PPHPTPH). ...
Keyword: 

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.
Keyword: