Judul: Diversity Of Soil Mesostigmata In Dry And Rainy Season  On Tropical Landuse Systems In Jambi Province
Abstrak: Mesostigmata merupakan salah satu fauna tanah yang banyak dijumpai di dalam maupun di permukaan tanah (top soil) dan hidup secara bebas yang termasuk ke dalam kelompok arthropoda tanah ordo dari subkelas Acari. Mesostigmata merupakan salah satu predator yang paling efektif dalam jaring makanan tanah, karena memiliki kepadatan yang tinggi untuk secara efektif mengendalikan populasi mangsa. Hutan hujan tropis di pulau Sumatera memiliki sejarah panjang perubahan penggunaan lahan. Provinsi Jambi merupakan salah satu daerah yang memiliki hutan hujan tropis dataran rendah. Perubahan hutan hujan tropis menjadi perkebunan kelapa sawit (Elaeis guineensis) dan karet (Hevea brasiliensis) menciptakan ekosistem baru bagi Mesostigmata. Penelitian ini bertujuan untuk membandingkan kelimpahan Mesostigmata di hutan hujan, perkebunan karet dan kelapa sawit di Provinsi Jambi. Tiga sistem penggunaan lahan yang digunakan;, hutan hujan, perkebunan karet dan perkebunan kelapa sawit dipelajari di lanskap Harapan di provinsi Jambi, Sumatera, Indonesia. Pengambilan sampel dilakukan pada bulan Maret, Juni, September dan Desember tahun 2017. Setiap plot sampel diambil pada tanah dan serasah. Hasil penelitian ini menunjukkan bahwa Total 3214 individu ditemukan dan diidentifikasi menjadi 12 famili. Urodinychidae adalah famili yang paling melimpah di seluruh sistem penggunaan lahan, dan Rhodacaridae adalah yang kedua. Penggunaan lahan memiliki efek yang sama pada semua famili Mesostigmata yang mendominasi., Mesostigmata is one of the many free-living soil arthropods found in the soil and litter and represents an order of mites (Acari). Mesostigmata is one of the most effective predators in soil food webs, because it has a high density to effectively control prey populations. Tropical rainforests on Sumatera island have a long history of land use change. Jambi Province is one of the areas has lowland tropical rainforests. The changing of tropical rainforests into oil palm plantations (Elaeis guineensis) and rubber (Hevea brasiliensis) creates a new ecosystems to Mesostigmata. This research aims for compare the abundance and diversity of Mesostigmata in rainforest, rubber and oil palm plantations in Jambi Province. Three land-use systems, rainforest, rubber plantations and oil palm plantations were studied in Harapan landscapes in Jambi province, Sumatera, Indonesia. Samples were taken during March, June, September and December 2017. Each plot of sample were take on soil and litter. The result of this research showed that in total 3214 individuals were found and were identified to 12 families. Urodinychidae was the most abundant family across land-use systems, and Rhodacaridae was the second. Land use had similar effect on all dominating Mesostigmata families.
Keyword: Mesostigmata, land-use system, dry season, rainy season

Judul: Diversity and Abundance of Two Canopy Beetle Families in Four Landuse Types at Harapan Rainforest, Jambi.
Abstrak: Pembukaan lahan hutan menjadi kawasan perkebunan menyebabkan penurunan berbagai spesies flora dan fauna di wilayah tropis, tidak terkecuali di Indonesia. Salah satu yang terdampak besar adalah penurunan kelimpahan dan kekayaan spesies serangga, diantaranya kumbang Elateridae dan Staphylinidae. Penelitian ini bertujuan memelajari pengaruh perbedaan waktu dan perubahan tata guna lahan terhadap keanekaragaman dan komposisi kumbang Elateridae dan Staphylinidae di beberapa wilayah Hutan Harapan, Jambi, Sumatra. Pengambilan sampel dilakukan dengan menggunakan metode pengasapan kanopi pohon pada empat tipe penggunaan lahan: hutan, hutan karet, perkebunan karet, dan perkebunan kelapa sawit. Pada masing-masing tipe penggunaan lahan, terdapat empat plot inti dan pada setiap plot terdapat tiga subplot sebagai ulangan. Serangga dikumpulkan dalam delapan perangkap (ukuran 1 m × 1 m) yang dipasang di bawah tajuk tanaman sebelum proses pengasapan. Sampel yang telah dikumpulkan, disortir, dan diidentifikasi. Kumbang Elateridae ditemukan sebanyak 527 individu yang terdiri dari 3 subfamili, 10 genus, dan 18 morfospesies, sedangkan kumbang Staphylinidae ditemukan sebanyak 694 individu yang terdiri dari 11 subfamili, 16 genus, dan 47 morfospesies. Perbedaan tipe penggunaan lahan mempengaruhi kekayaan spesies kumbang Elateridae dan Staphylinidae, tetapi perbedaan tipe penggunaan lahan tidak mempengaruhi kelimpahan spesies kumbang Elateridae dan Staphylinidae., Transformation of forest land into plantation areas has resulted in the decline of various species of flora and fauna in the tropics, including Indonesia. One of the major impacts is the decrease in the abundance and richness of insect species, including Elateridae and Staphylinidae beetles. This reserach was aimed to study the effect of time and landuse change toward the diversity and abundance of Elateridae and Staphylinidae beetles in Hutan Harapan landscape in Jambi, Sumatra. Sampling was carried out using the tree canopy fogging method on four types of land use: forest, jungle rubber, rubber plantation, and oil palm plantation. In each land use type, there are four core plots and in each core plot, there are three subplots. Insects were collected in 8 traps (1 m × 1 m) installed under the plant canopy before the fumigation process. Samples that have been collected, sorted, and identified. The Elateridae beetles were found in as many as 527 individuals consisting of 3 subfamilies, 10 genera, and 18 morphospecies. While Staphylinidae beetles were found as many as 694 individuals consisting of 11 subfamilies, 16 genera, and 47 morphospecies. Different types of land use affect the species richness of Elateridae and Staphylinidae beetles, but differences in land use types do not affect the abundance of Elateridae and Staphylinidae beetles species.
Keyword: arboreal, keanekaragaman hayati, transformasi habitat, arboreal, biodiversity, habitat transformation

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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