Judul: Type of Packaging and Storage  Temperature to Increase the Shelf Life of Aster Flower (Callistephus chinensis L.)
Abstrak: Bunga Aster (Callistephus chinensis L.) merupakan salah satu bunga yang dapat dimakan (edible flower). Sifat bunga yang mudah rusak menjadi kendala dalam bisnis bunga khususnya edible flower. Alternatif teknologi pascapanen yang dapat dilakukan terkait penyimpanan edible flower yaitu pengemasan dan penyimpanan pada suhu rendah. Penelitian ini bertujuan mengkaji pengaruh jenis kemasan dan suhu penyimpanan terhadap perubahan mutu dan umur simpan edible flower pada bunga Aster sehingga didapatkan kombinasi jenis kemasan dan suhu penyimpanan terbaik untuk mempertahankan mutu bunga. Tahapan penelitian dimulai dari persiapan sampel, analisis kemasan, pengemasan sampel (pada kemasan PP, PET, aluminium foil, dan kontrol), penyimpanan (pada suhu 10 ºC dan 20 ºC), dan pengamatan selama 6 hari masa simpan. Hasil penelitian menunjukkan kombinasi kemasan PP dan suhu penyimpanan 10 ºC (A1B1) merupakan perlakuan terbaik yang mampu mempertahankan mutu. Hasil uii organoleptik sampai hari ke-6 untuk perlakuan A1B1 masih bisa diterima panelis dari segi warna, kesegaran dan kesukaan secara keseluruhan. Pada hari ke-6, mutu dari perlakuan A1B1 terdiri dari kadar air sebesar 76.38% dari nilai awal 80.35%, susut bobot sebesar 25.66%, nilai L sebesar 25.28 dari nilai awal 31.52, dan nilai ºhue sebesar 321.63º dari nilai awal 322.13º, Aster (Callistephus chinensis L.) are one of the flowers that can be consumed by humans (edible flower). Flowers are easily damaged is an obstacles in the edible flower business. Alternative post-harvest technology that can be done related to edible flower storage is packaging and storage at low temperatures. This study aims to examine the effect of packaging type and storage temperature on changes in quality and shelf life of edible flowers on. The research stages started from sample preparation, packaging analysis, sample packaging (PP, PET, aluminum foil, control), storage (temperatures 10 ºC and 20 ºC), and observation for 6 days of storage. The results showed that the combination of PP packaging and storage temperature of 10 ºC (A1B1) was the best treatment that was able to maintain quality. The results of the A1B1 organoleptic test on the 6th day can still be accepted by panelists in terms of color, freshness and overall preference. On day 6, the quality of A1B1 consisted of a water content of 76.38% from an initial value of 80.35%, weight loss of 25.66%, an L value of 25.28 from an initial value of 31.52, and a hue value of 321.63º from an initial value of 322.13º.
Keyword: Bunga Aster, edible flower, kemasan, suhu penyimpanan, Aster flower, edible flower, packaging, storage temperature

Judul: Implementation of Active Packaging Technology to Extend The Shelf Life of Carnation Flowers (Dianthus Caryophyllus L.)
Abstrak: Pemanfaatan edible flower anyelir dalam beberapa tahun terakhir semakin populer di kalangan masyarakat. Kandungan air yang tinggi dalam bunga menimbulkan permasalahan karena bunga menjadi cepat rusak selama penyimpanan. Coating kitosan 0,1% terbukti mampu mempertahankan kualitas bunga anyelir selama 6 hari. Namun, penerapan edible coating cukup rumit sehingga dibutuhkan teknologi pascapanen lain yang lebih efisien. Oleh karena itu, teknologi kemasan aktif dengan bahan penyerap dapat dikembangkan pada bunga anyelir. Pada penelitian ini digunakan oxygen absorber untuk mengurangi konsentrasi O2 dalam kemasan dan silika gel untuk mengurangi H2O yang tertahan di dalam kemasan. Penelitian ini bertujuan untuk mengkaji pengaruh penggunaan kedua bahan penyerap pada kemasan bunga anyelir dan menentukan kombinasi yang terbaik. Perlakuan yang diberikan pada bunga adalah coating kitosan 0,1%, kemasan G1O1 (0,5 g silika gel dan 60 cc oxygen absorber), dan kemasan G2O2 (0,25 g silika gel dan 130 cc oxygen absorber). Hasil penelitian menunjukkan bahwa coating masih menjadi upaya terbaik untuk menjaga mutu bunga hingga hari ke-8 dengan nilai kadar air, susut bobot, nilai L, dan °hue selama penyimpanan sebesar 81,73%; 14,47%; 18,12; dan 12,64. Sementara itu, kemasan G1O1 merupakan perlakuan kemasan aktif terbaik dimana dapat mempertahankan kadar air, susut bobot, nilai L, dan °hue bunga sebesar 81,14%; 22,50%; 17,35; dan 14,40. Sebagai pembanding, nilai masing-masing parameter mutu pada kontrol pada akhir penyimpanan (8 hari) adalah 79,12%; 25,65%; 16,30; dan 9,26., The utilization of carnation as edible flower has been gaining popularity, but their high water content causes them to deteriorate quickly during storage. Previous research has shown that coating with 0,1% chitosan can maintain their quality for up to 6 days. However, the application of edible coatings is complex, so alternative postharvest technologies are needed. This study explores the use of active packaging technology with absorbent materials for carnation flowers. Oxygen absorbers were used to reduce oxygen concentration in the packaging, while silica gel was used to reduce water retention. The study aimed to determine the best composition of absorbent materials for the packaging. The treatments given to the flowers were coating with 0,1% chitosan, G1O1 packaging (0,5 g silica gel and 60 cc oxygen absorber), and G2O2 packaging (0,25 g silica gel and 130 cc oxygen absorber). The results showed that coating was still the most effective method for maintaining flower quality up to 8 days with values of moisture content, weight loss, L-value, and °hue during storage of 81,73%; 14,47%; 18,12; and 12,64. Meanwhile, G1O1 packaging is the best active packaging treatment which can maintain the moisture content, weight loss, L-value, and °hue of flowers by 81,14%; 22,50%; 17,35; and 14,40. For comparison, the values of each quality parameter in the control at the end of storage (8 days) were 79,12%; 25,65%; 16,30; and 9,26.
Keyword: Active packaging, carnation, edible flower, oxygen absorber, silica gel

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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