Judul: Risk Analysis and Mitigation of Discoloration in the  Supply Chain of Blue Swimming Crab (Case Study: PT Kelola Mina Laut Cikande)
Abstrak: Rajungan merupakan salah satu komoditas perikanan yang memiliki potensi ekonomi yang bernilai tinggi. Daging rajungan diolah menjadi produk olahan pasteurisasi kaleng. Daging rajungan mudah mengalami penurunan mutu. Salah satu penurunan mutu dalam industri rajungan kaleng pasteurisasi adalah perubahan warna (diskolorasi) daging. Faktor-faktor perubahan warna daging dapat dipengaruhi selama aktivitas pengolahan. Penelitian ini bertujuan mengidentifikasi rantai pasok rajungan dan mitigasi terkait terjadinya perubahan warna daging pada produk olahan rajungan kaleng pasteurisasi, serta strategi pengendaliannya. Identifikasi rantai pasok menggunakan metode Food Supply Chain Network (FSCN), sedangkan untuk mitigasi risiko diskolorasi pada daging dengan House of Risk (HOR). Pada titik miniplant teridentifikasi 8 sumber risiko penyebab diskolorasi daging, sedangkan pada miniplant 11 sumber risiko. Terdapat 7 tindakan mitigasi prioritas pada miniplant dan 6 pada tingkat plant . Strategi pengendalian diskolorasi, diantaranya pemahaman dan penerapan SOP bongkar muat ke pekerja secara rutin serta mengevaluasi SOP penyimpanan dan penambahan terhadap bahan pencegah diskolorasi., Blue-swimming crab is one of the fisheries commodities with high economic potential. Blue-swimming crab meat is processed into pasteurized canned products. This type of crab meat is prone to quality degradation. Quality degradation in the pasteurized canned blue swimming crab industry is characterized by the discoloration of the meat. The factors contributing to meat discoloration can be influenced during processing activities. This research aims to identify the blue swimming crab supply chain and mitigate the occurrence of meat discoloration in pasteurized canned blue swimming crab products, as well as develop kontrol strategies. The identification of the supply chain utilizes the Food Supply Chain Network (FSCN) method, while the risk mitigation for discoloration uses the House of Risk (HOR) method. At the miniplant level, 8 sources of risk causing meat discoloration have been identified, while at the main plant level, 11 sources have been identified. There are 7 priority mitigation actions at the miniplant level and 6 at the plant level. The discoloration control strategy includes understanding and routinely implementing unloading SOPs to workers and evaluating storage SOPs and adding discoloration-preventing materials
Keyword: Kualitas, diskolorasi, rajungan, rantai pasok, risiko

Judul: Potensi Pengelolaan dan Pemanfaatan Limbah Rajungan
Abstrak: Pasteurized Crab Meat merupakan salah satu ekspor terbesar hasil perikanan di Indonesia. Unit Pengolahan Ikan (UPI) menerima bahan baku berupa daging rajungan dari miniplant, hal ini menyisakan limbah rajungan yang cukup besar karena sekitar 60% bagian tubuh rajungan adalah cangkang. Penelitian terdahulu telah memberikan informasi bahwa limbah rajungan memiliki potensi pemanfaatan dan dapat meningkatkan nilai ekonomi limbah rajungan tersebut. Penelitian ini bertujuan memetakan rantai pasok terkait pemanfaatan limbah rajungan, termasuk menghitung potensi limbah, kapasitas produksi, nilai ekonomi dan identifikasi alternatif pemanfaatan limbah rajungan. Metode yang dilakukan dengan deskripsi kualitatif, benefit transfer, dan analisis pendapatan. Data hasil penelitian berhasil memetakan rantai pasok terkait pemanfaatan limbah rajungan di 8 Provinsi berdasarkan pada 37 Unit Pengolahan Ikan yang mengolah pasteurized crab meat dan 148 miniplant pemasok bahan baku. Responden memilih kitosan sebagai alternatif pemanfaatan limbah cangkang rajungan. Tempat pengelolaan limbah terpadu (TPLT) merupakan rencana implementasi pemanfaatan dan pengelolaan untuk meningkatkan nilai ekonomi limbah rajungan. Hal ini didukung oleh dimensi pentahelix yang terdiri dari pemerintah, industri, akademisi, media dan masyarakat. Kata Kunci: limbah, pemanfaatan, pengelolaan, pentahelix, rajungan , Pasteurized Crab Meat is one of the largest exports of fishery products in Indonesia. The Fish Processing Unit (UPI) raw materials in the form of whole crab from the miniplant, thus leaving a fairly large crab waste because about 60% of the crab is the shell. Previous research has provided information that crab waste has potential utilization and can increase the economic value of the crab waste. This study aims to mapping supply chains related to the utilization of crab waste, including calculating the waste potential, production capacity, economic value and alternative utilization of crab waste. The method used is qualitative description, benefit transfer, and income analysis. Data from the research were able to map the supply chain of crab waste utilization in 8 provinces based on 37 fish processing units that process pasteurized crabmeat and 148 miniplant suppliers of raw materials. Respondents chosing chitosan as an alternative of shell waste utilization. Integrated waste management site (IWMS) is an implementation plan for utilization and management to increase the economic value of crab waste. This is supported by the pentahelix dimension consisting of government, industry, academia, media and society. Keywords: crab, management, utilization, pentahelix, waste
Keyword: limbah, pemanfaatan, pengelolaan, pentahelix, rajungan

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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