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: Analysis of Factors Causing Residual Chloramphenicol (CAP)  Antibiotic Contamination and Its Control (Case Study of PT Kelola Mina Laut  Cikande)
Abstrak: Rajungan kaleng pasteurisasi merupakan produk olahan dari daging rajungan dengan target pasar ekspor ke luar negeri. Proses produksi yang kompleks menjadikan produk olahan rajungan mudah mengalami penyimpangan kualitas. Salah satu penyimpangan kualitas yang dapat terjadi berupa kontaminasi residu antibiotik chloramphenicol yang dapat berakibat pada penolakan produk oleh konsumen. Perlu adanya analisis untuk mengetahui faktor yang menyebabkan terjadinya kontaminasi tersebut agar dapat dilakukan pengendalian. Analisis dilakukan menggunakan metode Failure Mode Effect Analysis (FMEA). Analisis metode FMEA menekankan pada penilaian aspek severity, occurrence, dan detection dari faktor penyebab kegagalan. Kemudian dilakukan perhitungan Risk Priority Number (RPN) untuk mengetahui tingkat prioritas atau kepentingan faktor terhadap kejadian kegagalan. Hasil analisis menunjukkan bahwa kualitas air yang digunakan pada proses pengukusan dan pencucian peralatan, kepatuhan pekerja dalam melaksanakan SOP, dan penggunaan bahan kimia untuk proses higiene dan sanitasi menjadi faktor prioritas atau utama penyebab kontaminasi. Perbaikan dapat dilakukan untuk aspek kualitas air dengan pengawasan yang ketat dan menjaga kualitas air. Kemudian terkait kemampuan pekerja bisa diterapkan pelatihan pengembangan kebiasaan baik pekerja serta evaluasi penggunaan bahan kimia pada proses higiene dan sanitasi., Pasteurized canned crab is a processed product from crab meat with the target market for export abroad. The complex production process makes processed crab products easy to experience quality deviations. One of the quality deviations that can occur is residual chloramphenicol antibiotic contamination which can result in product rejection by consumers. It is necessary to analyze to find out the factors that cause the contamination so that control can be carried out. The analysis was carried out using the Failure Mode Effect Analysis (FMEA) method. The FMEA method analysis emphasizes the assessment of severity, occurrence, and detection aspects of the factors that cause failure. Then the calculation of Risk Priority Number (RPN) is carried out to determine the level of priority or importance of factors to the failure event. The results of the analysis show that the quality of water used in the process of steaming and washing equipment, worker compliance in implementing SOPs, and the use of chemicals for hygiene and sanitation processes are the priority or main factors causing contamination. Improvements can be made to the water quality aspect with strict supervision and maintaining water quality. Then related to the ability of workers, training can be applied to develop good habits of workers and evaluate the use of chemicals in the hygiene and sanitation process.
Keyword: Failure Mode and Effect Analysis (FMEA), rajungan, antibiotik chloramphenicol

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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