Judul: Addition of Whiteweed (Ageratum conyzoides) to Improve Water Quality Media and Survival Juvenile Patin Fish (Pangasionodon hypopthalmus) in a Closed Transportation System
Abstrak: Produksi ikan patin (Pangasionodon hypopthalmus) di beberapa daerah belum optimal, diperlukan kegiatan transportasi ikan dalam rangka meningkatkan produksi patin di berbagai daerah. Daun bandotan (Ageratum conyzoides) diketahui memiliki kegunaan dalam transportasi ikan. Tujuan penelitian ini adalah menganalisis penambahan daun bandotan terhadap peningkatan kualitas air media dan sintasan juvenil ikan patin pada transportasi tertutup. Penelitian ini menggunakan rancangan acak lengkap terdiri atas tiga perlakuan dan tiga ulangan. Perlakuan terdiri dari kontrol (K), perlakuan dosis 1 g/L (B1), dan perlakuan dosis 2 g/L (B2). Hasil penelitian menunjukkan penambahan daun bandotan tidak berpengaruh nyata terhadap kualitas air dan sintasan namun dapat menurunkan konsentrasi glukosa darah ikan pada saat transportasi. Penambahan daun bandotan 1 g/L memiliki keuntungan ekonomi yang paling besar. Berdasarkan penelitian ini, dosis terbaik dalam penambahan daun bandotan pada media transportasi yaitu 1 g/L., Production of Asian catfish (Pangasionodon hypopthalmus) in some areas is not optimal, fish transportation activities are needed in order to increase catfish production in various regions.. Whiteweed (Ageratum conyzoides) are known to have been benefits in fish transportation. The purpose of this study was to analyze the addition of whiteweed to the improvement of water quality media and juvenile survival of catfish in closed transportation. This study used a completely randomized design consisting of three treatments and three replications. The treatments consisted of control (K), treatment dose 1 g/L (B1), and treatment dose 2 g/L (B2). The results showed that the addition of whiteweed did not significantly affect the survival rate and water quality but could reduce the blood glucose concentration of fish during transportation. The addition of 1 g/L whiteweed has the greatest economic advantage. Based on this research, the best dose for adding whiteweed to transportation media is 1 g/L.
Keyword: Ageratum conyzoides, Pangasionodon hypopthalmus,, Survival, Transportation, Water quality

Judul: Study of Addition of Different Additives in  Closed System Transportation Media Against Survival Rate Catfish Seeds  Pangasius sp.
Abstrak: Ikan patin Pangasius sp. merupakan komoditas budidaya dengan nilai ekonomi dan tingkat konsumsi yang tinggi, sehingga diperlukan teknik transportasi ikan yang baik untuk penyebaran benihnya. Sistem transportasi yang digunakan pada penelitian adalah transportasi benih ikan patin dengan sistem tertutup. Penambahan bahan aditif dalam media transportasi perlu dilakukan karena dapat menunjang kondisi ikan yang ditransportasikan dengan cara menurunkan metabolisme dan mempertahankan keadaan lingkungan media selama pengangkutan berlangsung. Penelitian dilakukan dengan metode studi pustaka terkait transportasi benih ikan patin dengan sistem tertutup. Bahan aditif yang dievaluasi adalah a. bahan berbentuk padatan, yaitu zeolite, arang aktif, dan garam yang berperan sebagai stabilizer kualitas air dan b. bahan yang berbentuk cairan, yaitu akar tuba, minyak cengkeh, dan minyak sereh yang berperan sebagai anestesi ikan. Hasil terbaik berdasarkan literatur adalah kombinasi penambahan bahan stabilizer kualitas air dan anestesi dengan kepadatan tinggi dan durasi waktu transportasi yang panjang efektif meningkatkan sintasan pascatransportasi., Catfish Pangasius sp. is a cultivated commodity with a high economic value and high consumption, so good fish transportation techniques are needed for the spread of seeds. The transportation system used is the transportation of catfish seeds with a closed system. The addiction of additives in transportation media needs to be done because it can support the condition of fish transported by lowering metabolism and maintaining the state of the media environment during transportation. The research was conducted by literature study method related to catfish seeds transportation with closed system. Additives evaluated are a. solids in the form of zeolite, activated charcoal and salt that serves as a water quality stabilizer and b. materials in the form of liquids namely tubal roots, clove oil and citronella oil that acts as fish anesthesia. The best result based on the literature is a combination of addition of water quality stabilizer and anesthesia with high density and long duration of transportation time effectively improving post-transport survival rate.
Keyword: additives, closed systems transportation, survival rate, water quality

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
Keyword: