Judul: Rancangan Produksi Pati Umbi Talas (Colocasia esculenta L.)
Abstrak: Talas adalah umbi lokal yang mudah dibudidayakan dengan potensi produksi hingga 40 ton per hektar. Pati talas dapat berpeluang sebagai pati substitusi untuk memenuhi permintaan pati dalam negeri karena kandungan pati umbi talas yang tinggi. Tujuan dari penelitian ini adalah mendapatkan rancangan proses produksi pati talas serta mendapatkan tingkat kelayakan proyek produksi pati talas. Penelitian diawali dengan mengumpulkan data dan memilih metode yang tepat dengan mempertimbangkan beberapa parameter. Kemudian dilakukan perancangan proses dan perhitungan neraca massa. Berikutnya adalah analisis produksi secara rinci meliputi penentuan mesin dan peralatan, perhitungan energi, penjadwalan sederhana, dan perancangan tata letak. Serta diakhiri dengan analisis kelayakan rancangan produksi secara finansial. Produksi pati talas dirancang dengan bahan baku 30,000 ton umbi talas setiap tahunnya dengan hasil pati sebanyak 6,258 ton. Proses produksi meliputi pengupasan, pencucian, perendaman, pembilasan, penghancuran, pemerasan, penyaringan, pengeringan, serta pengemasan. Kebutuhan biaya investasi sebesar Rp2,461,387,500 dan biaya produksi Rp158,703,449,352 per tahun. Industri pati talas layak secara finansial dan memiliki nilai NPV Rp85,662,370,592; IRR 23.93%; B/C ratio 1.53; dan Payback Period 5.17 tahun., Taro is a local tuber that is easy to cultivate with potential production up to 40 tonnes per hectare. Taro starch has an opportunity as a substitute starch to meet domestic demand for starch due to the high starch content of taro tubers. The purpose of this research is to get the design of the taro starch production process and to get the feasibility level of the taro starch production project. The research begins with collecting data and selecting the appropriate method by considering several parameters. Then do the process design and mass balance calculations. Next is a detailed production analysis covering the determination of machines and equipment, energy calculations, simple scheduling, and layout design. And ended with a financial feasibility analysis of the production design. The production of taro starch is designed with a raw material of 30,000 tons of taro tubers each year with a starch yield of 6,258 tons. The production process includes stripping, washing, soaking, rinsing, crushing, squeezing, filtering, drying, and packaging. The investment cost required is IDR 2,461,387,500 and the production cost is IDR 158,703,449,352 per year. The taro starch industry is financially viable and has an NPV value of IDR 85,662,370,592; IRR 23.93%; B/C ratio 1.53; and Payback Period 5.17 years.
Keyword: financial analysis, production design, taro starch

Judul: Design Process of Sago Starch Industry
Abstrak: The existence of sago in Indonesia is very abundant with one of the derivative products it produces is sago starch. Sago starch has very good business prospects with increasing demand every year. However, the sago industry in Indonesia is still unable to maximize the production of sago starch to cope with the high demand. This study aims to determine the design sago starch production process, as well as to analyze it from a financial aspect. The stages of this study consist of selecting an alternative process, calculating the mass balance, selecting suitable machines and equipment, scheduling products, determining the plant layout, and analyzing financial feasibility. This industry run in batch system with a production target of 1000 kg of sago starch per day, the stages of the production process include shredded sago pith with a rasper machine, mixed with water in the mixing tank, filtered and dried with a rotary drum vacuum dryer, size uniformed by milling and sifting machine, and packed with a packaging machine. The financial feasibility analysis obtained shows that the sago starch industry is feasible to run and developed with Rp 1.464.364.966 of NPV, 1,97 of Net B/C, 37,74% of IRR and 4,23 years of payback period., Keberadaan sagu di Indonesia sangat melimpah dengan salah satu produk turunan yang dihasilkannya adalah pati sagu. Pati sagu memiliki prospek bisnis yang sangat bagus dengan permintaan yang terus meningkat setiap tahunnya. Namun, industri sagu di Indonesia masih belum mampu memaksimalkan produksi pati sagu untuk mengatasi tingginya permintaan. Studi ini bertujuan menentukan desain proses produksi pati sagu, sekaligus menganalisisnya dari segi aspek finansial. Tahapan dari studi ini terdiri dari pemilihan proses alternatif, perhitungan neraca massa, pemilihan mesin dan peralatan yang sesuai, penjadwalan produk, penentuan tata letak pabrik, dan analisis kelayakan finansial. Industri ini dijalankan secara sistem batch dengan target produksi 1000 kg pati sagu per hari, tahapan proses produksi yang dilakukan diantaranya yaitu batang sagu diparut dengan mesin parut, dicampur dengan air di tangki pencampur, disaring dan dikeringkan dengan rotary drum vacuum dryer, penyeragaman ukuran dengan mesin pengayak dan penggiling, dan dikemas dengan mesin pengemas. Analisis kelayakan finansial yang didapatkan menunjukkan industri pati sagu layak diusahakan dan dikembangkan dengan indikator NPV sebesar Rp 1.464.364.966, Net B/C 1,97, IRR 37,74% dan payback period 4,23 tahun.
Keyword: Analisis Kelayakan, Desain Proses, Pati Sagu

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
Keyword: