Judul: Pengaruh Media dan Lama Pengangkutan yang Berbeda terhadap Performa Cacing Tanah Lumbricus rubellus.
Abstrak: Cacing tanah Lumbricus rubellus mulai digemari oleh masyarakat karena memiliki banyak manfaat sehingga banyak produsen cacing yang mendistribusikan cacing tanah, namun tidak memperhatikan pengangkutan cacing tanah yang dapat mempengaruhi performanya. Penelitian ini bertujuan untuk menganalisis pengaruh media dan lama pengangkutan yang berbeda terhadap performa cacing tanah Lumbricus rubellus. Penelitian ini menggunakan cacing tanah Lumbricus rubellus sebanyak 13.5 kg, kotoran sapi perah dan kotoran sapi potong yang diangkut selama 1 jam, 2 jam, dan 3 jam. Peubah yang diamati meliputi susut cacing, persentase susut, suhu, kelembaban, dan pH. Penelitian ini menggunakan Rancangan Acak Lengkap dua faktor. Data dianalisis ragam (ANOVA) dan hasil analisis yang berbeda nyata dilanjutkan dengan uji Tukey. Hasil penelitian menunjukan bahwa jenis media dan lama pengangkutan berpengaruh nyata (P<0.05) terhadap performa cacing tanah. Hasil penelitian didapatkan bahwa media kotoran sapi potong dan lama pengangkutan 1 jam memiliki performa terbaik., Lumbricus rubellus is one type of earthworm that are starting to be liked by the community because it has many benefits so many worm producers distribute earthworms, but do not pay attention to the transportation of earthworms which can affect their performance. This study aims to determine the effect of different media and transportation time on the performance of Lumbricus rubellus earthworm. This study used 13.5 kg of Lumbricus rubellus, dairy dung, and beef dung transported for 1 hour, 2 hours, and 3 hours. The observed variables included weight loss, percentage of weight loss, temperature, humidity, and pH. The data were analyzed for variance (ANOVA) and the results of the analysis were significantly different, followed by the Tukey test. The results showed that the type of media and transportation time had a significant effect (P<0.05) on the performance of Lumbricus rubellus earthworms. The results showed that beef dung media and 1 hour transportation had the best performance.
Keyword: kotoran sapi, Lumbricus rubellus, lama pengangkutan, cattle dung, transportation time

Judul: Performa Cacing Tanah (Lumbricus rubellus) pada Media Kotoran Sapi dengan Penambahan Tepung Kulit Kakao
Abstrak: Cacing tanah merupakan salah satu organisme pengurai, penguraian oleh cacing tanah dapat 3-5 kali lebih cepat dibandingkan mikroba. Media cacing tanah dari kotoran sapi dapat ditambahkan pada limbah lain yang telah difermentasi atau diurai. Limbah kotoran sapi dan kulit kakao dapat digunakan sebagai media tumbuh cacing tanah. Penelitian ini bertujuan menganalisis performa cacing (Lumbricus rubellus) terhadap kotoran sapi dengan penambahan kulit kakao sebagai media hidup dengan taraf yang berbeda. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap (RAL) dengan 4 (empat) perlakuan dan 1 (satu) kontrol yang masing-masing diulang sebanyak 3 (tiga) kali dan dianalisis dengan uji lanjut Tukey. Media pemeliharaan dengan penambahan tepung kulit kakao berpengaruh (P<0,05) meningkatkan performa cacing tanah (Lumbricus rubellus). Penambahan tepung kulit kakao pada media kotoran sapi sampai 15% lebih baik dari perlakuan yang lainnya karena dapat meningkatkan performa cacing tanah (Lumbricus rubellus) diantaranya yaitu bobot total cacing 111,67 gram, produksi kokon 134,00 butir dan media yang berkurang rata-rata 569,33 gram, Earthworms are one of the decomposer organisms, decomposition by hworms can be 3-5 times faster than microbes. Earthworm media from cow ng can be added to other wastes that have been fermented or decomposed. Cow ng and cocoa shell waste can be used as a medium for growing earthworms. s study aims to analyze the performance of worms (Lumbricus rubellus) on le manure with the addition of cocoa shell as a living medium with different els. The design used in this study was a completely randomized design (CRD) h 4 (four) treatments and 1 (one) control, each of which was repeated 3 (three) es and analyzed by Tukey's follow-up test. The rearing medium with the ition of cocoa shell flour had an effect (P<0.05) on improving the performance earthworms (Lumbricus rubellus). The addition of cocoa shell powder to cow ng media is up to 15% better than other treatments because it can improve the formance of earthworms (Lumbricus rubellus) including the total worm weight 111.67 grams, cocoon production of 134.00 grains and an average reduced dia of 569.33 grams.
Keyword: cattle manure, cocoa shell, earthworm, performance

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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