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: Kebutuhan Perbekalan Melaut pada Unit Penangkapan Cast Net 51-100 GT di Pelabuhan Perikanan Samudera Nizam Zachman Jakarta.
Abstrak: Kegiatan penangkapan pada kapal cast net 51-100 GT membutuhkan berbagai komponen perbekalan. Perbekalan yang dibawa selama ini selalu mengalami kekurangan karena trip operasinya cukup lama, yaitu sekitar 3-4 bulan. Penelitian ini bertujuan untuk mendeskripsikan kondisi umum, mengidentifikasi jenis perbekalan, menghitung kebutuhan perbekalan aktual, dan mendeskripsikan penanganan perbekalan pada unit penangkapan cast net. Penelitian yang dilaksanakan di Pelabuhan Perikanan Samudera Nizam Zachman Jakarta dilakukan dengan metode survei menggunakan teknik wawancara. Teknik pengambilan sampel dengan purposive sampling. Analisis data yang digunakan adalah analisis deskriptif secara kuantitatif dan kualitatif. Hasil penelitian menunjukkan bahwa kapal cast net 51-100 GT menggunakan alat tangkap jala jatuh dengan target tangkapan utamanya adalah cumi-cumi. Jenis perbekalan yang digunakan pada unit penangkapan cast net terdiri perbekalan solar, air bersih, minyak pelumas, dan konsumsi. Kebutuhan biaya untuk perbekalan kapal cast net 51-100 GT adalah Rp 1.708.072.500,00/unit/tahun yang dialokasikan untuk solar 88,72%, minyak pelumas 1,54%, air bersih 0,18%, dan perbekalan konsumsi 9,56%. Tindakan yang dilakukan jika perbekalan tidak mencukupi selama kegiatan penangkapan yaitu pengiriman perbekalan dari fishing base ke fishing ground oleh pemilik kapal. Adapun tindakan saat perbekalan berlebih dibagikan kepada rombongan nelayan lain saat menuju fishing base., Fishing activities on 51-100 GT cast net vessels require various components of supplies. The supplies carried during this time always experience a shortage because the operation trip is around 3-4 months long. The study aims to describe the general condition of cast net fisheries, identify the types of supplies in the cast net fishing unit, calculate the actual supply needs in the cast net fishing unit, and describe the handling of supplies in the cast net fishing unit. The research was conducted at the Nizam Zachman Ocean Fishing Port Jakarta using a survey method using interview techniques. The sampling technique was purposive sampling. The data analysis used was descriptive quantitative and qualitative analysis. The results showed that 51-100 GT cast net vessels use fall net fishing gear, with the main target catch being squid. The supplies used in cast net fishing units consist of diesel fuel, clean water, lubricating oil, and consumption. The cost requirement for supplies for 51-100 GT cast net vessels was IDR 1,704,232,500.00/unit/year, allocated for diesel fuel 88.52%, lubricating oil 1.76%, clean water 0.18%, and consumption supplies 9.54%. The action taken if there are insufficient supplies during fishing activities is the delivery of supplies from the fishing base to the fishing ground by the boat owner. The actions are taken when the excess supplies are distributed to other fishing groups heading to the fishing base.
Keyword: cast net, supplies, consumption, handling, PPSNZ

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology