Judul: Kajian Habitat dan Aktivitas Kemunculan Kunang-Kunang dengan Observasi Cuaca Skala Mikro di Kawasan Situ Gunung, Kabupaten Sukabumi
Abstrak: Kunang-kunang merupakan serangga yang menghasilkan cahaya alami dan berperan sebagai indikator lingkungan. Beberapa negara seperti Jepang, Thailand, dan Malaysia telah memanfaatkan potensi kunang-kunang di bidang pariwisata. Kunang-kunang membutuhkan kondisi habitat yang sesuai dari segi ekologis maupun unsur-unsur fisiknya, termasuk unsur iklim dan cuaca. Penelitian ini bertujuan untuk mengetahui keterkaitan unsur-unsur cuaca skala mikro dan karakteristik lokasi dengan kemunculan kunang-kunang. Metode yang digunakan adalah observasi cuaca, visual encounter survey (VES) time search, dan identifikasi spesies. Observasi cuaca dan pengamatan kemunculan dilakukan secara bergiliran di jalur Wisma Kantor, Curug Sawer, Danau, dan Curug Cimanaracun pada malam hari pukul 19.30–22.00 WIB. Suhu optimum untuk kemunculan kunang-kunang berkisar pada 17.5–19.5 °C dengan kemunculan tertinggi pada RH 93–95%. Penurunan suhu udara, kejadian presipitasi, dan RH yang semakin tinggi dapat menghambat pergerakan sayap, sehingga kurang sesuai untuk kemunculan kunang-kunang. Karakteristik wilayah juga berkaitan dengan kunang-kunang. Hal ini ditunjukkan dengan adanya perbedaan spesies, penyebaran dan tingkat kemunculan kunang-kunang di setiap wilayah. Tingkat kemunculan kunang-kunang paling tinggi berada di jalur Curug Cimanaracun dengan tutupan tajuk yang lebih rapat, kelembaban cukup tinggi, dan terdapat badan air yang mendukung kunang-kunang, terutama fase telur dan larva. Kondisi yang lembab di jalur Curug Cimamaracun juga sesuai untuk kelangsungan hidup siput yang menjadi makanan larva kunang-kunang.
Keyword: Lampyridae, presipitasi, RH, suhu udara, VES

Judul: Kajian Habitat dan Aktivitas Kemunculan Kunang-Kunang dengan Observasi Cuaca Skala Mikro di Kawasan Situ Gunung, Kabupaten Sukabumi
Abstrak: Firefly is an insect that produces bioluminescence and serve as environmental indicator. Several countries such as Japan, Thailand, and Malaysia have use the potential of a firefly for tourism. Fireflies require suitable habitat conditions in terms of ecological and physical elements, including weather elements. This study aimed to determine the linkage elements of micro-scale weather with the emergence of fireflies. The methods used in this study include the weather observation, visual encounter surveys (VES) time search, and identification of species. Weather and emergence observation were conducted in rotation on four lanes (Wisma Kantor, Curug Sawer, Danau and Curug Cimanaracun) at night (19.30–22.00). The optimum temperature of emergence at range 17.5–19.5 °C and most found at RH 93–96%. Decreasing of air temperature, precipitation events, and higher RH can inhibit the movement of the wings, making they less suitable for the emergence of fireflies. Besides weather elements, the characteristics of any area related to the fireflies. Those indicated by the difference in species, the spread and the rate of appearance of fireflies in each region. The highest emergence of fireflies is located on Curug Cimanaracun lane where has denser canopy cover, humidity is quite high, and there is a body of water that supports the fireflies, especially eggs and larval phase. Humid conditions in Curug Cimanaracun lane also suitable for habitat of snails as prey of firefly larvae.
Keyword: Bogor Agricultural University (IPB), VES, RH, precipitation, Lampyridae, air temperature

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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