Judul: Analisis Kandungan dan Jenis Mikroplastik pada Tutut (Filopaludina javanica) di Waduk Cirata, Jawa Barat
Abstrak: Waduk Cirata digunakan oleh nelayan sekitar sebagai kegiatan perikanan budidaya dan perikanan tangkap. Alat tangkap tersebut pada umumnya berbahan fiber atau plastik. Mikroplastik masuk ke lingkungan perairan dengan dua cara yaitu secara primer dan sekunder. Penelitian ini dilakukan juga karena informasi mikroplastik pada tutut yang habitatnya di Waduk Cirata belum tersedia. Penelitian ini menggunakan analisis data berupa analisis statistik deskriptif dengan menggunakan software PAST 4 dan Ms. Excel. Uji normalitas dilakukan untuk menentukan data non parametrik. Berdasarkan uji statistik didapatkan bahwa karakteristik warna mikroplastik dan ukuran mikroplastik memiliki perbedaan nyata (p>0,05), dan pada bentuk mikroplastik terdapat perbedaan nyata p<0,05). Plastik dari industri perikanan terlihat jelas dalam berbagai penelitian terkait kontaminasinya di sekitar lingkungan. Mikroplastik bentuk fiber yang berasal dari bahan tekstil adalah subkelompok dari mikroplastik. Ukuran mikroplastik terbanyak yang ditemukan dalam Gastropoda adalah <300 µm. Tutut pada waduk Cirata telah tercemar mikroplastik, khususnya bentuk fiber dan fragmen dengan tipe polimernya nylon dan polyethylene (PE)., Cirata Reservoir is used by local fishermen for aquaculture and capture fisheries. The fishing gear is generally made of fiber or plastic. Microplastics enter into environment in two ways, primary and secondary. This research was also conducted because information on microplastics in tutut whose habitat is in the Cirata Reservoir is not yet available. This study used data analysis in the form of descriptive statistical analysis using PAST 4 software and Ms. Excel. A normality test was conducted to determine non-parametric data. Based on statistical tests, it was found that the color characteristics of microplastics and sizes of microplastics had significant differences (p>0.05), and in the shape of microplastics, there were significant differences between p<0.05). Plastics from the fishing industry can be seen clearly in various studies related to their contamination around the environment. Microplastics in the form of fibers derived from textile materials are a subgroup of microplastics. The size of the most microplastics found in gastropods was <300 m. Tutut in the Cirata reservoir has been contaminated with microplastics, especially in the form of fibers and fragments with polymer types of nylon and polyethylene (PE).
Keyword: microplastics, plastic waste, reservoirs, tutut

Judul: Microplastic Content in the Digestive Tract of Caught Fish in the Jatigede Reservoir, Sumedang Regency, West Java
Abstrak: Waduk Jatigede adalah perairan tergenang yang menampung massa air dan material yang terbawa aliran Sungai Cimanuk, seperti nutrien, sedimen, dan sampah yang di dalamnya termasuk mikroplastik. Tujuan penelitian ini adalah untuk mengidentifikasi keberadaan mikroplastik yang ditemukan dalam saluran pencernaan ikan tangkapan di Waduk Jatigede, Kabupaten Sumedang, Jawa Barat. Pengamatan mikroplastik dilakukan pada lambung dan usus ikan melalui tahapan pengamatan kebiasaan makan ikan, ekstraksi, yang dilanjutkan dengan analisis FTIR untuk mengetahui keberadaan, kelimpahan, dan jenis polimer. Data diolah menggunakan Ms. Excel dan program R. Mikroplastik telah ada dalam saluran pencernaan pada setiap spesies ikan yang dianalisis. Kelimpahan mikroplastik terbesar dijumpai pada spesies Hemibagrus nemurus yang merupakan ikan karnivora, sebanyak 40 partikel/gram. Serat berwarna biru dan polimer nilon memiliki proporsi terbesar., The Jatigede Reservoir is a reservoir of stagnant water that holds masses of water and materials carried by the Cimanuk River's flow, such as nutrients, sediments, and waste, including microplastics. The goal of this study was to find microplastics in the digestive tracts of fish taken in the Jatigede Reservoir in Sumedang Regency, West Java. Microplastic observations have been collected in fish stomachs and intestines by examining fish eating behaviors, extraction, and FTIR analysis to assess the presence, amount, and kind of polymer. Data was processed using Microsoft Excel and R software. Microplastics were found in the digestive tracts of all of the fish species examined. The species Hemibagrus nemurus, a predatory fish, has the highest concentration of microplastics, with as much as 40 particles per gram. Blue-colored fibers and nylon polymers have the largest proportion.
Keyword: fish, FTIR, Jatigede Reservoir, microplastic

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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