Judul: Raw materials Provision of Fish Processing Industry at Nizam Zachman Ocean Fishing Port Jakarta
Abstrak: The large medium-scale fish processing industry in Nizam Zachman Jakarta Ocean Fishing Port has low utility with reduced production frequency, the number of working days, and declining export volume. According to the information, the low utility of the industry is caused by a shortage of raw materials supply which is characterized by industry complaints related to the high price of fish caught in Muara Baru. In reality, the data shows that the volume of production and potential of fish resources is increasing. Based on these facts and information, the low utility of the Fish Processing Unit (UPI) appears not to be due to the lack of availability of grounded fish, but by other reasons that have not been identified. The initial allegation is that there are certain problems in the managerial provision of raw materials, where the processing industry must consider various factors in determining the decision to purchase raw materials. This research aims to identify the processes and mechanisms of production planning and procurement of raw materials, identify problems that occur at every stage in the raw material procurement process and develop recommendations for strategies to improve the utility of the processing industry. This research is a case study of four fish freezing companies in the form of limited liability companies with the purpose of EU exports. In-depth observations and interviews were conducted with respondents and the data were analyzed with qualitatively to describe conditions and problems. Based on the analysis of problems, then conduct literature studies (literature, theory, research results) related to problem solutions. Problem-solving that is likely to be implemented according to the company's capabilities is then formulated into a recommendation strategy to improve the utility of the fish processing industry. The results of the present study showed that there were problems in production planning and purchasing raw materials. Factors that influence the decision-making of the purchase of raw materials are the dynamics of buyer's country demand, negotiated price agreement, and completeness of quality requirements. Based on the problems faced, the recommendations of short-term policies that can be done by UPI are looking for new potential markets, making employee arrangements, and proposing that the complementary authority require quality certification in fish in suppliers. Besides, long-term recommendations that can be made by UPI are active promotion to potential buyer countries, reviewing integrated quality control systems, and employee recruitment., Industri pengolahan ikan skala menengah besar di Pelabuhan Perikanan Samudera Nizam Zachman Jakarta memiliki utilitas rendah dengan berkurangnya frekuensi produksi, jumlah hari kerja dan menurunnya volume ekspor. Menurut informasi rendahnya utilitas industri disebabkan oleh kekurangan pasokan bahan baku yang ditandai dengan adanya keluhan industri terkait tingginya harga ikan hasil tangkapan ikan di Muara Baru. Pada kenyataannya data menunjukkan bahwa volume produksi dan potensi sumber daya ikan meningkat. Berdasarkan fakta dan informasi tersebut utilitas Unit Pengolahan Ikan (UPI) yang rendah nampaknya bukan disebabkan oleh kurangnya ketersediaan ikan yang didaratkan, tetapi oleh sebab sebab lain yang belum teridentifikasi. Dugaan awal adalah adanya permasalahan tertentu pada manajerial penyediaan bahan baku, dimana industri pengolahan harus mempertimbangkan berbagai faktor dalam menentukan keputusan pembelian bahan baku. Penelitian ini
Keyword: fisheries industry; negotiated; raw material; strategy; utility.

Judul: Analisis Manfaat Ekonomi dan Alternatif Kebijakan Pengelolaan Limbah Padat Industri Ikan Tuna (Studi Kasus: Kawasan Pelabuhan Perikanan Samudera Nizam Zachman Jakarta).
Abstrak: Permintaan produk ikan tuna semakin tinggi khususnya untuk pasar ekspor sehingga aktivitas penangkapan dan pengolahan ikan tuna meningkat. Pelabuhan Perikanan Samudera Nizam Zachman Jakarta (PPSNZJ) merupakan pelabuhan perikanan terbesar di Indonesia dengan 65% ikan yang didaratkan adalah jenis ikan tuna. Industri pengolahan perikanan di Kawasan PPSNZJ menghasilkan limbah padat ikan tuna yang memiliki potensi untuk dimanfaatkan. Penelitian ini bertujuan untuk: (1) mengkaji pemanfaatan dan karakteristik usaha pengolahan limbah padat ikan tuna di Kawasan PPSNZJ; (2) mengestimasi besarnya nilai tambah dan pendapatan usaha dalam pengolahan limbah padat ikan tuna; (3) mengestimasi besarnya penyerapan tenaga kerja pada usaha pengolahan limbah padat ikan tuna, dan (4) menganalisis prioritas alternatif kebijakan pengelolaan limbah padat ikan tuna di Kawasan PPSNZJ. Penelitian ini menggunakan metode survei dan metode analisis data yang digunakan meliputi analisis deskriptif, nilai tambah dengan metode Hayami, pendapatan usaha, dan Analytical Hierarchy Process (AHP). Hasil penelitian menunjukkan bahwa limbah padat ikan tuna dimanfaatkan menjadi bahan campuran pakan dan minyak ikan, serta karakteristik usaha pengolahan limbah padat ikan tuna termasuk kelompok usaha mikro. Nilai tambah rata-rata yang dihasilkan dari usaha pengolahan limbah padat ikan tuna sebesar Rp 828/kg limbah padat ikan tuna. Pendapatan rata-rata usaha pengolahan limbah padat ikan tuna sebesar Rp 21.756.488/bulan dengan nilai R/C sebesar 1,63. Jumlah HOK yang dibutuhkan oleh usaha pengolahan limbah padat ikan tuna sebesar 96 HOK/bulan. Prioritas utama alternatif kebijakan pengelolaan limbah padat ikan tuna adalah kerjasama dalam mengolah limbah padat ikan tuna antara masyarakat dan pelaku industri.
Keyword: analisis pendapatan, analytical hierarchy process, ikan tuna, limbah padat, metode Hayami

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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