Judul: Pengaruh Penyinaran Light Emitting Diode (LED) dan Beda Aplikasi Hormon terhadap Pertumbuhan Stroberi di Dataran Rendah
Abstrak: Perlakuan pencahayaan LED sudah cukup banyak dilakukan pada tanaman sayuran daun, sedangkan pada tanaman stroberi masih sangat terbatas. Pengaplikasian hormon pada tanaman dapat membantu pertumbuhan, perkembangan, serta pertahanan terhadap hama dan penyakit. Penelitian ini bertujuan mengetahui jenis cahaya dan beda hormon terhadap pertumbuhan dan fisiologi tanaman stroberi. Penelitian dilakukan di dalam screenhouse pada bulan Desember 2021 hingga Februari 2022 di Dramaga, Bogor, Jawa Barat yang memiliki elevasi sekitar 178,6 m dpl. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) dengan dua faktor berupa jenis cahaya LED Biru, Merah, dan Kombinasi Merah:Biru (1:1) selama 21 jam dan beda hormon (Metil Salisilat 0,50 mmol l-1 dan Metil Jasmonat 0,25 mmol l-1). Hasil penelitian menunjukkan bahwa LED biru-Metil Jasmonat memiliki pengaruh terbaik dalam meningkatkan pertumbuhan pucuk daun baru. Seluruh perlakuan tidak berpengaruh nyata terhadap pertumbuhan bunga dan stolon. Penggunaan LED kombinasi dengan hormon Metil Salisilat memiliki hasil terbaik dalam akumulasi klorofil. Pengaruh perlakuan LED Merah-Metil Salisilat paling efektif dalam akumulasi glukosa dan fruktosa pada daun., LED lighting application has been done on vegetable plants, while on strawberry plants it is still very limited. The application of hormones effects to plants can help growth, development, and defense against pests and diseases. This study aimed to determine the type of light and hormones on the growth and physiology of strawberry plants. The research was conducted in a screenhouse from December 2021 to February 2022 in Dramaga, Bogor, West Java, which has a height of about 178.6 m above sea level. The study used a completely randomized block design (RKLT) with two factors, namely the type of LED light Blue, Red, and Combination of Red:Blue (1:1) for 21 hours and different hormones (Methyl Salicylate 0.50 mmol l-1 and Methyl Jasmonate 0.25 mmol l-1). The results showed that LED blue-Methyl Jasmonate had the best effect in increasing the growth of new shoots. All treatments had no significant effect on flower and stolon growth. The use of LED in combination with Methyl Salicylate had the best results in chlorophyll accumulation. Effect of LED Red-Methyl Salicylate treatment was most effective in the accumulation of glucose and fructose in leaves.
Keyword: Chlorophyll, Light Emitting Diode, Methyl Jasmonate, Methyl Salicsylate, Strawberry

Judul: Effects of Spectrum and Ilumination Time of Light Emitting Diode (LED) on Physiology and Secondary Metabolite Profiles of Strawberries in Lowlands
Abstrak: Stroberi sebagai buah dengan antioksidan tinggi memiliki perbedaan fisiologi dan metabolit sekunder yang bergantung dengan teknik budidayanya. Salah satu perlakuan modifikasi lingkungan yang dapat dilakukan adalah penggunaan LED sebagai cahaya buatan. Penelitian bertujuan mengetahui jenis cahaya dan waktu penyinaran LED terhadap fisiologi dan metabolomik stroberi. Penelitian menggunakan rancangan acak kelompok (RAK) dengan dua faktor berupa jenis cahaya LED (biru, merah, kombinasi merah-biru dan putih) dan waktu penyinaran (15 jam, 18 jam dan 21 jam). Hasil penelitian menunjukkan bahwa LED biru 18 jam memiliki efektivitas dalam meningkatkan pertumbuhan pucuk. Penggunaan LED kombinasi dengan waktu penyinaran 15 jam dan 21 jam memiliki hasil terbaik dalam akumulasi klorofil, glukosa dan fruktosa. Senyawa metabolit umum yang ditemukan berupa, tyrasol, phytol, asam linoleat, asam palimtat, vitamin E dan clionasterol. Senyawa spesifik banyak ditemukan di perlakuan kontrol dan LED merah., Strawberries are a fruit with high antioxidants, have differences in physiology and secondary metabolite profiles that depend on their cultivation technique. One of the cultivation technique treatments is the use of LEDs as artificial light. This research was aimed to determine the type of light and photoperiod that can optimize the physiology and metabolomics of strawberries using LEDs. The study used a randomized block design (RBD) with two factors, the type of LED light (blue, red, combination of red-light, and White) and photoperiod (15 hours, 18 hours, and 21 hours). The results showed that the 18 hours blue LED was effective in increasing shoot growth. The combination of LED uses with 15 hours and 21 hours has the best results in the accumulation of chlorophyll, glucose, and fructose. Common metabolite compounds found are tyrasol, phytol, linoleic acid, palmitic acid, vitamin E and clionasterol. Specific compounds were found in the control and red LED treatments.
Keyword: chlorophyll, glucose, LEDs, secondary metabolite, strawberry

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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