Judul: Energy Consumption of Tuna, Skipjack, Tuna Frigate Fishing Vessels Operations at Pondokdadap Beach Fishing port
Abstrak: Armada penangkapan TCT di Indonesia masih didominasi dengan ukuran <60 GT, sehingga membutuhkan industrialisasi. Namun, industrialisasi dapat berdampak negatif bagi lingkungan karena identik dengan peningkatan armada yang lebih besar sehingga mengkonsumsi lebih banyak energi. Agar industrialisasi sesuai prinsip sustainability, diperlukan perhitungan konsumsi energi relatif terhadap produksi TCT. Tujuan penelitian ini adalah menghitung jumlah konsumsi BBM terhadap hasil tangkapan armada handline di PPP Pondokdadap. Penelitian ini menggunakan metode purposive sampling serta accidental sampling dengan jumlah sampel sebanyak 32 buah kapal. Hasil penelitian menunjukkan rata-rata nilai FUI kapal handline membutuhkan BBM sebesar 0,66 kg untuk mendaratkan 1 kg ikan dan mengeluarkan biaya BBM sebesar Rp137,55 untuk setiap Rp1.000,00 pendapatan kotor yang diperoleh. Emisi gas buang CO, CO2, PM, NOx, dan SOx per 1 kg ikan berturut-turut sebesar 0,004 kg; 0,002 kg; 0,0002 kg;0,006 kg; dan 0,011 kg. Hasil yang diperoleh dari penelitian ini selanjutnya dapat dijadikan acuan untuk industrialisasi kapal penangkapan tuna skala kecil., The vast majority of TCT fishing fleet in Indonesia is fishing vessels <60 GT, thus requiring industrialization. However, industrialization can have a negative impact on the environment as it involves larger, thats consuming more energy. In order to keep industrialization in line with the principle of sustainability, it is necessary to calculate the energy consumption relative to TCT production. The purpose of this study is to calculate the amount of fuel consumption against the catch of the handline fleet at PPP Pondokdadap. This study used purposive sampling and accidental sampling methods with a total sample size of 32 vessels. The results of FUI calculation show that handline vessels require 0,66 kg of fuel to land 1 kg of fish and spend Rp137,55 of fuel costs for every Rp1.000,00 of gross revenue earned. Exhaust emissions of CO, CO2, PM, NOx, and SOx per kilogram of landed fish were 0.004 kg; 0.002 kg; 0.0002 kg; 0.006 kg; and 0.011 kg, respectively. The results obtained from this study can then be used as a reference for the industrialization of small-scale tuna fishing vessels.
Keyword: FUI, Gas emission, Handline, Fuel consumption, Fisheries industrialization

Judul: Efficiency of Fishing Supply Production Factors on Drift Gillnet Fishing Vessels of 41-60 GT in Tegalsari Coastal Fishing Port
Abstrak: Dalam kegiatan penangkapan ikan, permasalahan yang sering kali terjadi ialah kurangnya perbekalan saat operasi kegiatan penangkapan. Penelitian ini bertujuan untuk mengidentifikasi kondisi umum, menghitung kebutuhan perbekalan aktual, dan menganalisis efisiensi faktor produksi perbekalan melaut unit penangkapan jaring insang hanyut berukuran 41-60 GT di Pelabuhan Perikanan Pantai (PPP) Tegalsari. Penelitian dilakukan melalui observasi secara langsung dan wawancara terhadap nelayan, pengurus, dan pemilik kapal menggunakan metode purposive sampling. Hasil penelitian ini menunjukkan bahwa unit penangkapan tersebut beroperasi selama 2-3 bulan dengan hasil tangkapan utama berupa ikan tongkol dan ikan tenggiri. Jenis perbekalan yang digunakan ialah perbekalan operasional yang terdiri dari solar, oli, air bersih, dan perbekalan konsumsi yang terdiri dari konsumsi dan lainnya. Perbekalan melaut yang dibawa masih tergolong tidak efisien, karena efisiensi Nilai Produksi Marginal (NPM) yang diperoleh masing-masing sebesar 1,153 pada solar, 10,866 pada air bersih, dan 0,010 pada perbekalan konsumsi., In fishing activities, a common issue that often occurs is the lack of supplies during the operation of fishing activities. This research aims to identify the general conditions, calculate the actual supply needs, and analyze the efficiency of fishing supplies on drift gillnet fishing vessels sized on 41-60 GT at the Tegalsari Coastal Fishing Port. The research was conducted through direct observation and interviews with fishermen, managers, and ship owners using the Purposive Sampling method. The results of this study indicate that the fishing vessels operate for 2-3 months with the main catch being skipjack tuna and mackerel. The types of supplies used are operational supplies consisting of diesel, oil, fresh water, and consumable supplies consisting of food and others. The supplies carried are still classified as subefficient, as evidenced by the Marginal Production Value (MPV) efficiency obtained each of the variabels at 1.153 for diesel, 10.866 for fresh water, and 0.010 for consumable supplies.
Keyword: drift gillnet, drift gillnet fishing supply, efficiency

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.
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