Judul: Analysis of Potential Application of Cleaner Production and Water Footprint Analysis in Small-Scale Sweet Potato Flour Industry
Abstrak: Penggunaan air pada industri tepung ubi jalar masih belum diketahui. Identifikasi penggunaan air dilakukan dengan menghitung water footprint pada proses produksi dan penanaman ubi jalar. Penggunaan air pada penanaman ubi jalar sebanyak 33,33 liter/ton dan untuk produksi tepung ubi jalar sebanyak 666,67 liter/ton, Sekali produksi membutuhkan 300 kg ubi jalar untuk menghasilkan tepung sebanyak 152,4 kg. Pembuatan tepung ubi jalar menghasilkan rendemen sebesar 50,8%. Produksi tepung ubi jalar masih memiliki beberapa masalah seperti kerusakan pada mesin penggilingan, pengeringan yang belum efisien dan masih belum diterapkannya SOP yang jelas dalam proses produksi serta masih menghasilkan limbah berupa kulit ubi jalar. Perlu metode untuk menangani proses yang menghasilkan limbah. Identifikasi alternatif produksi bersih dilakukan dengan metode quick scan dan pembobotannya menggunakan metode AHP. Kelayakan rancangan produksi bersih dianalisa dengan kelayakan teknis, lingkungan, ekonomi, dan sosial. Alternatif yang diberikan setelah dilakukan pembobotan dan analisis kelayakan adalah pelatihan pemilihan bahan baku ubi jalar dan SOP pembuatan tepung, pelaksanaan pelatihan good manufacturing practice, perbaikan mesin penggilingan, penerapan pengeringan menggunakan pengering efek rumah kaca, dan pemanfaatan limbah kulit ubi jalar cacat menjadi ransum ternak. Dengan penerapan produksi bersih dan diketahuinya total penggunaan air diharapkan industri tepung ubi jalar dapat menjadi industri yang berkelanjutan., The use of water in the sweet potato flour industry is still unknown. Identification of water use is done by calculating the water footprint in the process of producing and planting sweet potatoes. The use of water in the planting of sweet potatoes as much as 33.33 liters / ton and for the production of sweet potato flour as much as 666.67 liters / ton. Once production requires 300 kg of sweet potatoes to produce flour as much as 152.4 kg. The manufacture of sweet potato flour produces a yield of 50.8%. The production of sweet potato flour still has some problems such as damage to the milling machine, drying that has not been efficient and still has not applied a clear SOP in the production process and still produces waste in the form of sweet potato skin. It needs a method to handle the processes that produce waste. Identification of clean production alternatives is done by quick scan method and weighting using the AHP method. The feasibility of a clean production design is analyzed with technical, environmental, economic, and social feasibility. Alternatives provided after weighting and feasibility analysis are the training of the selection of sweet potato raw materials and sop of making flour, the implementation of good manufacturing practice training, repair of milling machines, the application of drying using greenhouse effect dryers, and the utilization of stained sweet potato skin waste into livestock rations. With the application of clean production and the known total use of water, it is expected that the sweet potato flour industry can become a sustainable industry.
Keyword: Produksi bersih, Tepung ubi jalar, Ubi jalar, Water Footprint

Judul: Perancangan Tata Letak Pabrik Pengolahan Tepung Ubi Jalar (Ipomoea batatas).
Abstrak: Sweet potato productivity is not balanced with proper utilization. The current utilization sweet potato in Indonesia are still many processed into refined products household. Sweet potato potential can be maximized when processed into semi-finished materials that sweet potato flour is more economically valuable. Sweet potato flour industry has not been quite a lot and still dominated by small and medium industries. Problems which are commonly among other processed that are not hygienic, fluctuating product quality, and sewage treatment potluck. The problems is caused by there is no awareness of owners implement systems plant layout. This research aims to make the design plant layout of the processing plant sweet potato flour that has layout and material flow so that the process is faster dan tidy. The research is divided into two stages, the planning and implementation stages of the design plant layout. Design of plan layout made at the planning stages. From the design plant layout then caried out the aplication form of trial production. Ends with technological analysis and product analysis. Result of the analysis set Ciampea worthy as the plant site. Based on the selection process of the production and selection of equipment generating plant with an installed capacity of 107 kg/day and a maximum capacity of 214 kg/day. Design the layout using a systemic approach to see the connection between the activity and the relationship between space. The result of design layout is factory site plan along with the material flow from the receipt of raw materials to product storage (Lampiran 5). Based on the result of product analysis indicates that the product has been produced according to the standard flour products dan standard sweet potato flour product in Indonesia.
Keyword: design, layout, plant layout, flour, sweet potato

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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