Judul: Analisis Risiko dan Kebijakan Sumber Pasokan Ikan Hias Clown Loach pada PT. Qian Hu Joe Aquatic Indonesia
Abstrak: Clown loach is a species of fish that most preferred by customers but its availability is still limited. In order to meet the request, the company should work with various suppliers. There are two kinds of suppliers, external suppliers and internal suppliers (companies produce their own fish). The best supplier policy is set by company to maintain the flow of inputs and outputs in order to remain efficient. The aim of the study is to identify the characteristics of the Clown Loach’s supplier and analyze sources of supply that is beneficial to the company. Method of data analysis using decision diagram for two kinds of policy scenarios. Meanwhile, the calculations using Microsoft Excel. The results of supplier’s policy analysis when uncertain policy is a company gains a higher profit if relying on external suppliers as the major supplier. The cost is Rp 842.465.792 with fish mortality risk of Rp 10.273.973 and profit gains Rp 280.993.163. External suppliers ensure that they offer fish with better quality, ready to be shipped, and the company does not need to pay operational charge.
Keyword: Bogor Agricultural University (IPB), supply, risk, policy, decision diagram, clown loach

Judul: Evaluasi dan Pemilihan Pemasok Ikan Hias Cardinal Tetra pada PTQian Hu Joe Aquatic Indonesia
Abstrak: Supplier is one of important part in supply chain for manufacture. Selecting inappropriate suppliers can disturb the manufacture operational’s activity, whereas selecting the appropriate one can reduce the purchasing cost, improves competitiveness of the market and the satisfaction of end-user product. The selecting of the rightsuppliers also can be used by the company in the longterm cooperation. The purpose of this research is to identify and determine the weight of the criteria in suppliers assessment performance with the result suppliers performance rank by using AHP (Analytic HierarcyProcess) method. The criteria of assesment performance is adjusted with manufacture’s condition include some criteria such as quality, cost, delivery, flexibility, and responsiveness. The assesment result of criteria is Quality as highest priority with of weight 0.373. The assesment result of subciteria is Price of Fish as highest priority with of weight 0.833. Suppliers rank with highest priority are Irwan rosdi (0.281), Farm (0.219), Catur (0.215), Kodrat (0.123), Sukirman (0.082) and Jo aquatic (0.080).
Keyword: Bogor Agricultural University (IPB), selecting suppliers, SCM, AHP

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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