Judul: Perencanaan Penggunaan Lahan Berkelanjutan untuk Tanaman Bawang Putih (Allium sativum L) di Kabupaten Tegal Provinsi Jawa Tengah
Abstrak: Garlic is one of the most popular agricultural commodities by the community in daily life. The benefits of garlic other than as the main seasoning in food can also be used as raw materials for herbal medicines. The average consumption of Garlic per capita from 2013 to 2017 is 0.231 ounces, 0.300 ounces, 0.355 ounces and 0.359 ounces, and 0.313 ounces. The national garlic development program by the Ministry of Agriculture in 2017 is conducting an acceleration program for self-sufficiency in garlic with the goal of fulfilling consumption needs, reducing imports, and self-sufficiency independently. Tegal Regency is one of the regions in Indonesia that has the potential to develop Garlic. This research has the aim of planning sustainable land use for garlic plants. To achieve the main objectives, objectives such as (1) delineating land use/cover in Tegal Regency, (2) analyzing the potential of land for garlic, (3) analyzing the sustainability of garlic farming, (4) formulating strategies to increase garlic production. Delineation of land cover/land use using SPOT 6 image interpretation in 2018. Analysis of land availability is carried out using forest area status maps, land cover/land use maps, and spatial plan maps that are overlaid to obtain land information available. Land suitability evaluation is done by matching the plant growth requirements with the characteristics and quality of garlic plant land. Sustainability analysis is carried out using Multidimensional Scaling (MDS) through the MDS questionnaire, and analysis of production improvement strategies using AHP-SWOT with Expert choice. The results of satellite imagery interpretation show that the largest area of land cover is in a paddy field and built-up land with an area of 54 143 hectares and 14 533 hectares, respectively. The actual land suitability analysis shows that the land in Tegal Regency is in the appropriate marginal class (S3) covering an area of 65 103 hectares, and not suitable (N) covering an area of 29 914 hectares. After an effort was made to improve the limiting factor in each land suitability into potential land suitability, the land suitability class increased to S2 and S3. The potential land area in class S2 is 69 329 hectares and the land area in class S3 is 24 414 hectares. Availability of land for the development of garlic covering an area of 3 419 hectares. The available land area suitable for garlic development is on an area of 3 419 hectares, with a fairly suitable land suitability class (S2) and according to marginal (S3). The most extensive land for S2 class is in Bojong District with an area of 744.9 hectares and the largest land for class S3 is in Kedungbanteng District with an area of 512.5 hectares. The results of the multidimensional analysis of the sustainability of garlic farming in Tegal district show that its sustainability status is in the fairly sustainable category with an index of 62.66. The sensitive attributes obtained from the sustainability analysis are the use of waste, use of pesticides, agricultural extension, land management, productivity, marketing reach. Product storage technology, technology suitability and assistance, marketing agencies, import policies. The intervention was carried out
Keyword: Analitical hierarchy process, kesesuaian lahan, Multidimentional scalling

Judul: Development of a Spatial Decision Support System for Evaluation of Garlic Lands Suitability
Abstrak: Direktur Jenderal Hortikultura Indonesia saat ini melakukan program pembangunan berswasembada pada komoditas bawang putih. Program yang dilakukan untuk meningkatkan luas lahan bawang putih menjadi 72.249 Ha pada tahun 2019 dari semula yang hanya 23.900 Ha pada tahun 2018. Peningkatan luas lahan dikarenakan jumlah produksi bawang putih yang menurun 2,5% per tahun. Namun, jumlah tersebut belum maksimal untuk menutupi jumlah konsumsi bawang putih di Indonesia yang meningkat mencapai 10,6% per tahun. Pengambilan keputusan yang tepat dalam evaluasi kesesuaian lahan bawang putih sangat penting dalam perencanaan peningkatan luas lahan bawang putih. Keputusan yang baik akan diperoleh apabila data pendukung yang dibutuhkan terpenuhi dan menggunakan metode yang tepat. Penelitian ini bertujuan untuk mengembangkan suatu sistem pendukung keputusan spasial, yang dapat digunakan untuk melakukan evaluasi kesesuaian lahan bawang putih di Kabupaten Magetan dan Kabupaten Solok. Sistem yang dibangun menggunakan model pohon keputusan spatial decision tree. Model spatial decision tree dihasilkan pada penelitian sebelumnya dengan akurasi 94,36%, dengan jumlah aturan 66 pada Kabupaten Magetan dan menghasilkan akurasi 60,29% dengan jumlah aturan 33 pada Kabupaten Solok. Pada pengembangan sistem berbasis web ini digunakan metode iterative system development cycle. Pengembangan sistem pada penelitian ini terdiri atas empat tahapan pokok yaitu perencanaan, analisis, desain dan implementasi. Penelitian ini berhasil membangun sistem pendukung keputusan spasial (SPKS) untuk evaluasi kesesuaian lahan bawang putih. Hasil pengujian menggunakan blackbox testing menunjukkan bahwa fitur utama yaitu menu klasifikasi lahan dan peta visualisasi lahan. Serta fitur pendukung dalam SPKS kesesuaian lahan bawang putih yaitu menu data master, kriteria lahan, menu basis aturan dan menu bantuan mampu berjalan dengan baik sesuai dengan analisis-analisis kebutuhan sistem, The Directorate Jenderal of Horticulture (Indonesia) carried out a self sufficient development program on garlic commodities by increasing the garlic land area to 72.249 Ha in 2019 from 23.900 Ha in 2018. The expansion of cultivated land caused by the fact that gralic production in 2017 decreases 2,5% per year, meanwhile this number couldn't cope with the garlic consumption rate in Indonesia which increased 1,06% per year. The proper decision making in evaluating the suitability of garlic cultivation land is crucial for the expansion planning. Good decision will be achieved if the supporting data are complete and developed using the proper method. This study aims to develop a decision support system for garlic land suitability in Magetan and Solok districts spacial data. This system is developed using the spatial decision trees. On the Magetan dataset, the best model has 33 rules with accuracy of 94,34% and relief variable as the root node. Whereas on the Solok dataset, the best model has 66 rules with accuracy of 60,29% and soil texture variable as the root node. This web-based system is developed using the iterative system development cycle method. System development in this study consist of four main phases: plan, analysis, design and implementation. This study has successfully produced a spatial decision support System for Evaluation of Garlic Lands Suitability. Knowledge base of the system is created based on the spatial decision tree resulted in the previous study. The results of the blackbox testing show that the five features of the system: land criteria
Keyword: spatial decision tree, decision support system, garlic, iterative system development cycle, land suitability spatial, spatial decision tree model

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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