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 of Dominant Diptera in Tree Canopies in Lowland Rainforest Landscapes, Jambi Province
Abstrak: Hutan hujan tropis dataran rendah di wilayah Jambi mengalami penurunan tutupan kanopi secara masif akibat alih fungsi lahan menjadi perkebunan monokultur. Konversi lahan menyebabkan penurunan kelimpahan dan kekayaan spesies serangga seperti semut, Hymenoptera parasitoid, dan kumbang. Sampai saat ini, belum ada laporan penelitian mengenai dampak konversi lahan terhadap kelimpahan dan kekayaan spesies Diptera di Sumatra, khususnya di Bukit Duabelas dan Hutan Harapan, Jambi. Penelitian ini bertujuan mengetahui dampak konversi hutan menjadi perkebunan karet dan sawit, pengaruh musim, habitat riparian, dan lanskap terhadap kelimpahan dan kekayaan spesies Diptera kanopi, khususnya di Jambi. Pengambilan sampel dilakukan dengan teknik pengasapan di empat tipe penggunaan lahan (hutan alami, hutan karet, perkebunan karet, dan perkebunan sawit), dua musim (kemarau dan hujan), dua habitat (riparian dan nonriparian), dan dua lanskap (Bukit Duabelas dan Hutan Harapan). Jumlah Diptera kanopi yang diperoleh yaitu 42 333 individu dari 29 subfamili, 109 genus, dan 947 spesies yang diketahui. Penelitian ini menunjukkan bahwa konversi hutan menjadi perkebunan menurunkan kelimpahan dan kekayaan spesies Diptera kanopi. Kelimpahan Diptera kanopi terendah ditemukan pada perkebunan sawit, sedangkan kekayaan spesies terendah ditemukan pada perkebunan karet. Komposisi Diptera kanopi paling mirip yaitu pada hutan alami dan hutan karet, sedangkan komposisi Diptera kanopi paling berbeda ditemukan pada hutan alami dan perkebunan sawit. Musim hujan meningkatkan kelimpahan dan kekayaan spesies Diptera kanopi. Keberadaan habitat riparian meningkatkan kelimpahan Diptera kanopi, tetapi tidak memengaruhi kekayaan spesiesnya. Lanskap Bukit Duabelas memiliki kelimpahan dan kekayaan spesies Diptera kanopi yang lebih tinggi daripada Hutan Harapan., The lowland tropical rainforests in Jambi have experienced a massive decline in canopy cover, a direct consequence of land conversion into monoculture plantations. This drastic change in land conversion reduced the abundance and species richness of canopy insects, including ants, butterflies, parasitoid wasps, and beetles. It is crucial to note that, to date, research has yet to be conducted on the abundance and species richness of Diptera in Sumatra, particularly in Bukit Duabelas and Harapan Rainforest, Jambi, in the context of land conversion. This research aims to determine the impact of forest conversion into rubber and oil palm plantations, the effect of seasons, riparian habitats, and landscapes on the abundance and species richness of canopy Diptera, especially in Jambi. Canopy Diptera samples were collected using fogging in four land-use systems (forest, jungle rubber, rubber plantation, and oil palm plantation), two seasons (dry and rainy), two habitats (riparian and nonriparian), and two landscapes (Bukit Duabelas and Harapan Rainforest). A total of 42 333 individuals were collected and identified to morphospecies level, belonging to 10 families, 29 subfamilies, 109 genera, and 947 known species. The finding of this study indicates that the conversion of forests into plantations reduces the abundance and species richness of canopy Diptera. The lowest abundance of canopy Diptera was found in oil palm plantations, while the lowest species richness was in rubber plantations. Canopy Diptera in forests has a similar composition to those in jungle rubbers, while it was most different in oil palm plantations. The rainy season increases the abundance and the species richness of canopy Diptera. The riparian habitat increased the abundance of canopy Diptera but did
Keyword: arboreal insects, biodiversity, flies, food web, mosquitos

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.
Keyword: