Judul: Quality Improvement of Fermentation Straw Forage with Plukentia volubilis L and Gynura procumbens leaf powder
Abstrak: Penelitian dengan tujuan menguji kualitas silase jerami padi baik kualitas fisik, kimia, dan mikrobiologi dengan penambahan bungkil sacha inchi dan tepung daun sambung nyawa menggunakan metode rancangan acak lengkap dengan 9 perlakuan dan 5 ulangan. Peubah yang diamati adalah kualitas fisik (Warna, aroma, tekstur, jamur), kualitas kimia (pH, kandungan berat kering, kandungan abu, kandungan protein kasar, kandungan serat kasar, kandungan lemak kasar), dan kualitas mikrobiologi (populasi bakteri pada media MRS, NA, PDA, dan BLB). Hasil uji kualitas fisik menunjukan bahwa pemberian bungkil sacha inchi dan tepung daun sambung nyawa tidak berbeda nyata (P>0,05) terhadap kualitas silase jerami padi. Hasil uji kualitas kimia menunjukan bahwa pemberian bungkil sacha inchi dan tepung daun sambung nyawa berpengaruh nyata meningkatkan kandungan nutrisi silase jerami padi (P<0,05). Hasil uji mikrobiologi menunjukan bahwa pemberian bungkil sacha inchi dan tepung daun sambung nyawa berpengaruh mempertahankan silase dari mikroba patogen., The research aimed to testing the quality of rice straw silage in terms of physical, chemical and microbiological quality with the addition of sacha inchi meal and Gynura procumbens leaf powder used a completely randomized design with 9 treatments and 5 replications. The observed variables were physical quality (color, flavour, texture, mold), chemical quality (pH, dry matter, ash, crude protein, crude fiber, crude fat), and microbiological quality (bacterial population on media De Man Rogosa an Sharpe, nutrient agar, potato dextrose agar and Blue light broth. The results of the physical quality test showed that the addition of sacha inchi meal and Gynura procumbens leaf powder was not significantly different (P>0.05) on the quality of rice straw silage. The results of the chemical quality test showed that the addition of sacha inchi meal and Gynura procumbens leaf powder had a significant effect on increasing the nutritional content of rice straw silage (P<0.05). The results of microbiological tests showed that the addition of sacha inchi meal and Gynura procumbens leaf powder had an effect on maintaining silage from pathogenic microbes.
Keyword: Gynura procumbens leaf powder, sacha inchi meal, silage, strain

Judul: Evaluation of The Quality of  Rice Straw Silage Enriched with Indigofera Leaves and Longevity Spinach Leaf Flour
Abstrak: Penelitian ini bertujuan mengevaluasi kualitas silase jerami padi yang diperkaya daun Indigofera dan tepung daun sambung nyawa yang terdiri dari 5 perlakuan dengan 5 ulangan menggunakan rancangan acak lengkap (RAL) untuk kualitas silase, dan rancangan acak kelompok (RAK) untuk uji in vitro. Perlakuan terdiri dari T0 = jerami padi 100%; T1 = jerami padi 75% + daun Indigofera 25%; T2 = jerami padi 50% + daun Indigofera 50%; T3 = T1 + tepung daun sambung nyawa 10% (w/w); T4 = T2 + tepung daun sambung nyawa 10% (w/w). Setiap perlakuan ditambahkan dedak padi, molases, dan inokulum L. plantarum. Parameter yang diamati yaitu karakteristik fisik dan fermentatif, kandungan nutrien, fermentabilitas, kecernaan dan kinetika gas. Data diuji menggunakan ANOVA dan perbedaan nyata dilanjutkan uji Duncan. Penambahan daun Indigofera dan tepung sambung nyawa memberikan pengaruh nyata (p<0,05) terhadap kualitas silase, kandungan nutrien, kecernaan, dan kinetika gas rumen. Penambahan daun Indigofera dan tepung daun sambung nyawa mampu meningkatkan kualitas silase namun belum mampu meningkatkan kecernaan secara in vitro., This study aimed to evaluate the quality of rice straw silage enriched with Indigofera leaves and longevity spinach (Gynura procumbens) leaf flour that consisted of 5 treatments with 5 replications, using (1) a completely randomized design (CRD) for the quality of silage, and (2) a randomized block design (RBD) for the in vitro analysis. The treatments consisted of T0 = rice straw 100%; T1 = 75% rice straw + 25% Indigofera leaves; T2 = 50% rice straw + 50% Indigofera leaves; T3 = T1 + longevity spinach flour 10% (w/w); T4 = T2 + longevity spinach flour 10% (w/w). Each treatment was added rice bran, molasses, L. Plantarum inoculum. The parameters analyzed were physical, fermentative characteristics, nutrient content, fermentability, digestibility, and gas kinetics. Data were analyzed using ANOVA and significantly different treatments would be further analyzed with Duncan test. The results showed the addition of Indigofera leaves and longevity spinach flour had a significant effect (p<0.05) silage qualities, nutrient content, digestibility, and gas production. It concluded that the addition of Indigofera leaves and longevity spinach flour increased the quality of the silage but had not been able to increase the in vitro digestibility.
Keyword: Indigofera, in vitro, jerami padi, silase, tepung daun sambung nyawa, Indigofera, in vitro, longevity spinach, rice straw, silage

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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