Judul: Effect of Differences in Container Basic Materials toward Productivity of Eisenia fetida
Abstrak: Cacing adalah hewan invertebrata yang hidup di tanah dan memiliki kandungan nutrisi yang tinggi, sehingga banyak dimanfaatkan sebagai pakan ternak, industri kecantikan dan obat-obat-obatan. Tujuan penelitian ini dilaksanakan adalah untuk melihat pengaruh perbedaan material dasar penyusun wadah terhadap produktifitas cacing Eisenia fetida. Penelitian ini menggunakan tiga jenis material dasar wadah yang berbeda yaitu seng, plastik, dan kayu. Penelitian dilaksanakan pada lingkungan yang sama selama empat minggu. Variabel yang akan diteliti dalam penelitian ini adalah pertumbuhan bobot badan dan jumlah kokon pada setiap jenis wadah. Hasil penelitian menunjukan bahwa perbedaan jenis material dasar penyusun wadah tidak berpengaruh pada produktivitas cacing Eisenia fetida. Produktivitas cacing Eisenia fetida pada wadah berbahan kayu sedikit lebih tinggi dibandingkan wadah lain, hal ini dikarenakan kondisi media hidup cacing yang paling optimal dengan kondisi suhu rata-rata sekitar 23,48°C–24,76°C, pH 6,70–7,17, dan kelembapan 77%-79%. Kondisi media pada wadah seng dan plastik masih memenuhi kondisi ideal bagi hidup cacing tanah yang menyebabkan perbedaan material penyusun wadah tidak berpengaruh terhadap produktivitas cacing Eisenia fetida., Worms are invertebrates that live in soil and contains high nutrition. It used as additives in animal feed, beauty industry, and health industry. This research was conducted to see the effect of using containers with different basic materials to the productivity of Eisenia fetida. The research was conducted using three different types of container materials, which is zinc, plastic, and wood. The research was conducted experimentally in the similar environment and time for four weeks. The variables that will be tested in this study are body weight gain and number of cocoons for each container. The results showed that the different types of basic materials making up the container had no effect on the productivity of the Eisenia fetida worm. The productivity of Eisenia fetida worms in wooden containers was slightly higher than other containers, this was due to the optimal condition of the worm's living media with an average temperature of around 23,48°C–24,76°C, pH 6,70–7,17, and humidity 77%-79%. The condition of the media in the zinc and plastic containers still met the ideal conditions for earthworms to live, which caused the difference in the material that made up the container did not affect the productivity of the Eisenia fetida worm.
Keyword: Cacing tanah, Media pemeliharaan, Produktivitas, Productivity, Raising medium, Worm

Judul: Productivity of Earthworms (Pheretima sp.) with the Addition of Green Shell Flour as Maintenance Media
Abstrak: Cacing tanah memiliki banyak kemampuan, antara lain: mendekomposisi material organik, dan mengaduk material organik dan anorganik. Faktor lingkungan yang mempengaruhi kehidupan cacing tanah antara lain suhu, pH, kelembaban, tekstur, dan kandungan nutrien. Peningkatan jumlah timbunan dan masih minimnya pemanfaatan limbah cangkang kerang. Penelitian ini bertujuan untuk menganalisis produktivitas cacing tanah Pheretima sp. dengan memanfaatkan limbah cangkang kerang hijau. Penelitian ini menggunakan metode eksperimen dengan Rancangan Acak Lengkap (RAL) dengan 4 (empat) perlakuan dan 3 (tiga) ulangan dan analisis uji lanjut Tukey. Hasil penelitian menunjukkan adanya pengaruh nyata (P<0,05) pada penggunaan feses sapi sebanyak 90% dengan penambahan tepung cangkang kerang hijau 10% lebih baik dari perlakuan lain karena terbukti dapat meningkatkan bobot cacing tanah (Pheretima sp.) sebanyak 33,3 gram dan meningkatkan jumlah konsumsi media sebanyak 262,67 gram. Penambahan tepung cangkang kerang hijau dapat meningkatkan produktivitas cacing tanah pada taraf penggunaan kurang dari atau sama dengan 10%., Earthworms have many abilities, including: decomposing organic matter, and mixing organic and inorganic materials. Environmental factors that affect the life of earthworms include temperature, pH, humidity, texture, and nutrient content. Increasing the number of piles and still minimal utilization of shell waste. This study aims to analyze the productivity of the earthworm Pheretima sp. by utilizing waste green mussel shells. This study used an experimental method with a completely randomized design (CRD) with 4 (four) treatments and 3 (three) replications and Tukey's follow-up test analysis. The results showed that there was a significant effect (P<0.05) on the use of cow feces as much as 90% with the addition of 10% green mussel shell flour which was better than other treatments because it was proven to increase the weight of earthworms (Pheretima sp.) by 33.3 grams and increased the amount of media consumption by 262.67 grams. The addition of green mussel shell flour can increase the productivity of earthworms at a usage level of less than or equal to 10%.
Keyword: green mussel, Pheretima sp., productivity, shell waste

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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