Judul: The Effects of Light Emitting Diode (LED) Spectrum and Hormone Treatment by Cooling the Root Zone on The Growth of Strawberries in The Lowlands
Abstrak: Modifikasi lingkungan tumbuh stroberi yang dapat dilakukan dengan penggunaan LED sebagai cahaya buatan dan aplikasi chiller untuk pendinginan daerah perakaran. Penelitian ini bertujuan mengetahui pengaruh perbedaan spektrum warna LED dan aplikasi hormon terhadap pertumbuhan tanaman stroberi dengan pendinginan daerah perakaran. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan dua faktor berupa jenis cahaya LED biru, merah, kombinasi merah-biru (1:1) selama 21 jam dan pemberian hormon metil jasmonat 0,50 mmol l-1 dan metil salisilat 0,25 mmol l-1. Hasil penelitian menunjukkan bahwa pertumbuhan tunas daun baru terbanyak pada perlakuan LED biru-metil jasmonat sebanyak 31 tunas daun. LED biru-metil salisilat memiliki nilai pertumbuhan pucuk tertinggi, yaitu 16 cm. Pengukuran kandungan glukosa yang tertinggi pada perlakuan LED biru-metil Salisilat, yaitu 0,260 µg ml-1, nilai kandungan fruktosa tertinggi terdapat pada perlakuan biru-metil jasmonat yaitu sebesar 0,139 µg ml-1., Environmental modification for strawberry cultivation can be done by using LED as artificial light and chiller application for cooling the root area. This study aims to determine the differences in the LED light spectrum and hormone application on the growth of strawberry plants under cooling the root zone. This study used a Completely Randomized Block Design (CRBD) with two factors, namely the types of LED light blue, red, red-blue combination (1:1) for 21 hours and application of 0.50 mmol l-1 of methyl jasmonate and methyl salicylate 0.25 mmol l-1. The results showed that the highest growth of new leaf shoots in the LED blue-methyl jasmonate treatment was 31 leaf shoots. LED blue-methyl salicylate had the highest shoot growth value, which was 16 cm. The measurement of the highest glucose content in the LED blue-methyl salicylate treatment was 0.260 µg ml-1, the highest fructose content value was found in the blue-methyl jasmonate treatment, was in 0.139 µg ml-1.
Keyword: chlorophyll, fructose, glucose, methyl jasmonate, methyl salicsylate

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: 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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