Judul: Machine Vision Design to Evaluate Performance of Purwoceng (Pimpinella pruatjan)  with Nutrition Dosage and Photo Periodicity
Abstrak: Tanaman purwoceng merupakan salah satu tanaman herba asli Indonesia yang berkhasiat obat dan dikategorikan hampir punah yang tumbuh di dataran tinggi. Budidaya tanaman purwoceng dilakukan pada ruang terkendali plant factory. Penelitian ini bertujuan membangun program computer untuk mengamati bentuk fisik tanaman purwoceng menggunakan dimensi fraktal, luas tajuk tanaman, dan luminosity untuk mengevaluasi keragaan tanaman purwoceng pada berbagai perlakuan dosis nutrisi dan lama penyinaran. Tahapan penelitian ini mengacu pada tahapan pembangunan program komputernya. Mengevaluasi keragaan tanaman purwoceng pada berbagai perlakuan dosis nutrisi dan lama penyinaran dengan menggunakan image processing. Terdapat 9 perlakuan untuk nutrisi dan lama penyinaran. Program luas daun mengacu pada nilai jumlah piksel yang memiliki presentase MAPE sebesar 5,67%. Pada 9 perlakuan nutrisi dan pencahayaan, perlakuan 1000 ppm-14 jam memiliki nilai rata-rata dimensi fraktal terbesar dan perlakuan 1000 ppm-16 jam memiliki luas tajuk daun terbesar, dan nilai luminosity terkecil ada pada perlakuan 1500 ppm-16 jam. Melalui nilai luas daun, luminosity, dan dimensi fraktal sistem ini mampu memberikan informasi perlakuan terbaik untuk pertumbuhan tanaman purwoceng., Purwoceng is one of Indonesia's native herbaceous plants that has medicinal efficacy and categorized as almost extinct that grows in the plateau. Cultivation of purwoceng is carried out in the Plant Factory. This research aims to build a computer program to observe the physical form of purwoceng using fractal dimensions, leaf area, and luminosity to performance of purwoceng with nutrition dosage and photo periodicity. The stages of the research refers to computer development program. Evaluate the performance of purwoceng on nutrition dosage and photo periodicity using image processing. There are 9 treatments for nutrition and photo periodicity. The leaf area program refers to the value of the total pixels that have Mean Absolut Percentage error of 5.67%. In 9 nutrient and lighting treatments, the 1000 ppm-14 hours treatment has the largest fractal dimension value and the 1000 ppm-16 hours treatment has the largest leaf area, and the smallest luminosity value is in the 1500 ppm-16 hours treatment. This system is able to provide the best treatment information for the growth of purwoceng through the leaf area, luminosity, and fractal dimensions.
Keyword: fractal dimension, image processing, leaf area, luminosity, purwoceng

Judul: Design and Build Automatic Nutrient Mixing Control System in Drip Irrigation Purwoceng Plant Cultivation System
Abstrak: Purwoceng merupakan tanaman obat asli Indonesia yang tumbuh secara endemik di Dieng, Jawa Tengah. Purwoceng memiliki senyawa yang digunakan pada industri obat. Produksi purwoceng dipengaruhi oleh parameter lingkungan tumbuhnya. Maka dari itu, dalam rangka pelestarian purwoceng, perlu kajian budidaya purwoceng dalam lingkungan terkontrol sehingga purwoceng dapat dibudidayakan secara optimal dan terlindungi dari kepunahan serta membantu ketersediaan bahan baku obat. Penelitian ini bertujuan untuk membuat sistem controlling parameter nutrisi pada tanaman purwoceng dalam plant factory. Purwoceng ditanam dengan tiga kondisi konsentrasi larutan nutrisi yang berbeda yaitu 1000 ppm, 1500 ppm, dan 2000 ppm. Plant factory mampu mengkondisikan lingkungan sesuai kebutuhan purwoceng dengan suhu udara 15–26 °C dan kelembaban udara 60–75%. Luaran yang diharapkan dari penelitian ini adalah hasil uji coba dan ketelitian sistem kontrol otomatis pencampuran nutrisi di plant factory berupa nilai error untuk setiap nilai electricity conductivity yang telah ditentukan., Purwoceng is a native Indonesian medicinal plant that grows endemic in Dieng, Central Java. Purwoceng has compounds used in the drug industry. Purwoceng production is influenced by the environmental parameters of its growth. Therefore, in the context of preserving purwoceng, it is necessary to study the cultivation of purwoceng in a controlled environment so that purwoceng can be cultivated optimally and protected from extinction and help the availability of medicinal raw materials. This study aims to create a system for controlling the nutritional parameters of the. Purwoceng is planted with three conditions nutrient solution concentrations, namely 1000 ppm, 1500 ppm, and 2000 ppm. The plant factory can be conditioning the environment according to Purwoceng's needs with an air temperature of 15–26 °C and air humidity of 60–75%. The expected output of this research is the results of testing and accuracy of the automatic control system for mixing nutrients in factories, the error value for each predetermined electrical conductivity value.
Keyword: electricity conductivity, irigasi tetes, nutrisi, plant factory, purwoceng

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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