Judul: Business Development Model of the Tawangmangu  Baru Garlic Variety (Selo District)
Abstrak: Bawang putih varietas Tawangmangu Baru dengan kualitas super dalam tahap uji coba tanam di Kecamatan Selo. Kemudian, Kelompok Tani Argo Ayuningtani dipercayakan dalam uji coba pengembangan varietas bawang putih yang baru. Tujuan penelitian ini adalah: (i) menganalisis kondisi internal dan eksternal; (ii) merumuskan strategi pengembangan usaha hulurisasi; (iii) merumuskan rancangan model bisnis untuk mengembangkan komoditas bawang putih; dan (iv) menganalisis kelayakan bisnis untuk mengembangkan komoditas bawang putih varietas Tawangmangu Baru di Kelompok Tani Argo Ayuningtani. Penelitian ini dimulai dari Oktober 2021-Maret 2023. Lokasi penelitian dilaksanakan pada Desa Senden, Kecamatan Selo. Metode analisis yang digunakan yaitu analisis deskriptif, analisis SWOT, dan analisis kelayakan finansial. Hasil penelitian menunjukkan bahwa Kelompok Tani Argo Ayuningtani berada pada posisi grow dan build berdasarkan analisis menggunakan matriks IE. Pada perhitungan matriks SWOT, menghasilkan 12 alternatif strategi. Sedangkan kelayakan bisnis pada PT Kelompok Tani Argo Ayuningtani menunjukkan NPV yang positif, IRR lebih besar dari tingkat pengembalian, Net B/C diatas 1 dan PP sebesar 2 tahun., Tawangmangu Baru garlic variety with super quality in the trial stage in Selo district. Then, the Argo Ayuningtani Farmers Group was entrusted with the trials of developing new garlic varieties. The objectives of this research are: (i) to analyze the internal and external conditions; (ii) to formulate a strategy for developing the upstreamization business; (iii) to formulate a business model design; and (iv) to analyze the business feasibility of developing the Tawangmangu Baru variety garlic commodity in the Argo Ayuningtani Farmer Group. This research starts from October 2021-March 2023. The research location was carried out in Senden Village, Selo District. The analytical method used were descriptive analysis, SWOT analysis, and financial feasibility analysis. The results showed that Argo Ayuningtani Farmer Group is in a grow and build position based on an analysis using the IE matrix. In calculation of the SWOT matrix, it produces 12 alternative strategies. While, business feasibility at Argo Ayuningtani Farmer Group shows a positive NPV, IRR is greater than the rate of return, Net B/C is above 1 and PP is 2 years
Keyword: business model canvas, garlic, financial feasibility

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: 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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