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: Kunang-kunang (Coleoptera: Lampyridae) di Cikampek Kabupaten Karawang dan Dramaga Kabupaten Bogor
Abstrak: Kunang-kunang sebagai anggota famili Lampyridae merupakan kumbang berukuran kecil hingga sedang yang terdistribusi hampir di seluruh dunia, terutama di lingkungan dengan tingkat kelembaban yang cukup tinggi. Bioluminescence merupakan salah satu fitur yang dimiliki oleh famili Lampyridae, walaupun tidak semua spesies ini memiliki kemampuan bioluminescence. Kemampuan bioluminescence pada kunang-kunang digunakan sebagai alat komunikasi dan sinyal tanda untuk menarik pasangannya. Penelitian ini bertujuan mengidentifikasi dan mendeskripsi kunang-kunang yang ada di Kecamatan Dramaga Kabupaten Bogor dan Cikampek Kabupaten Karawang. Metode penelitian dilakukan dengan menangkap kunang-kunang dewasa dan larva kunang-kunang pada malam hari. Identifikasi sampai tingkat genus menggunakan kunci determinasi yang sesuai. Kunang-kunang dewasa dan larva yang terkoleksi berasal dari famili Lampyridae subfamili Luciolinae, genus Luciola dengan ciri elitra dan pronotum berwarna coklat, bagian ventral tubuh berwarna jingga kecoklatan, dan warna cahaya yang dihasilkan berwarna kehijauan.
Keyword: kunang-kunang, Lampyridae, Luciola, bioluminescence, Cikampek, Dramaga

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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