Judul: The Fern of West Timor  East Nusa Tenggara
Abstrak: Based on this study there are 58 species belonging to 36 genera. They are Achrosticum (1 species), Adiantum (5 species), Amphineuron (3 species), Asplenium (4 species), Athyrium (1 species), Belvisia (1 species), Botrycium (1 species), Ceratopteris (1 species), Christella (4 species), Ctenitis (1 species), Ctenopteris (1 species), Cyathea (1 species), Davallia (2 species), Dennstaedtia (1 species), Diplazium (2 species), Doryopteris (1 species), Drynaria (2 species), Dryopteris (1 species), Gleichenia (1 species), Heterogoniurn (1 species), Humata (1 species), Lycopodium (1 species), Microlepia (1 species), Microsorium (1 species), Nehprolepis (2 species), Oleandra (1 species), Platycerium (1 species), Pleocnemia (1 species), Pteris (5 species), Pyrrosia (1 species), Sellaginela (1 species), Selliguea (1 species), Sphaerostephanos (2 species), Tectaria (1 species), Trichomanes (1 species), and Vittaria (1 species).
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Judul: Biosystematic Study Of The Fern Genus Diplazium In West Malesia
Abstrak: Diplazium is a large genus consisting of about 400 species occur mainly in the tropics, sparingly in the subtropic and only locally extending into temperate. It was estimated that 300 species of the records were occurred in Malesia. Taxonomically, Diplazium is very difficult and quite insufficiently known. Therefore a comprehensive study on Diplazium in West Malesia was conducted by using morphological, ecological, geographic distribution, anatomical, palinological, cytological, as well as DNA analysis to understand the diversity and relationship among species. Based on gross morphological study on 1051 collection number of specimens as well as living collections, it was concluded that West Malesian Diplazium comprises of 69 species with 14 varieties. Thirteen species of them are proposed and described as new species, namely Diplazium asymmetricum, D. batuayauense, D. crameri, D. densisquamatum, D. halimunense, D. loerzingii, D. megasegmentum, D. megasimplicifolium, D. meijeri, D. parallelivenium, D. profluens, D. subalternisegmentum, and D. subvirescens. Two new varieties are poposed, namely D. accedens var. spinosum and D. silvaticum var. pinnae-ellipticum. D. pallidum var. montanum and D. accedens var. ridleyi are proposed as new status.
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Judul: Model Interaksi Gravitasi Banyak Massa Untuk Prediksi Dinamika Harga Bitcoin.
Abstrak: Penelitian ini ditujukan untuk memprediksi harga Bitcoin dengan menggunakan metode pengoptimuman berbasis interaksi gravitasi banyak massa (Gravitational Search Algorithm atau GSA) dengan parameter yang akurat berdasarkan nilai error yang kecil. Nilai parameter yang diperoleh dari metode GSA disubstitusi pada persamaan Gaussian untuk meramalkan harga Bitcoin selanjutnya. Hasil peramalan divalidasi dengan uji R2 dan uji MAPE. Hasil menunjukkan bahwa Model Gaussian Termodifikasi Orde 5 memberikan hasil terbaik dengan nilai R2 sebesar 0.8824 dan nilai MAPE minimal sebesar 8.4672%. Hasil simulasi dengan variasi rentang nilai parameter [0,8000], [0,800] dan [0,80] yaitu model 3 memberikan nilai R2 terbesar yaitu 0.89865, namun untuk nilai MAPE terkecil didapatkan dari simulasi dengan variasi rentang parameter [0,10000], [0,1000], dan [0,100] yaitu model 1. Hasil interpolasi, prediksi dan validasi harga Bitcoin menggunakan data harian selama 1 tahun dengan model 1 dan model 3 menunjukkan hasil yang kurang baik, ditunjukkan dengan nilai R2 yang kurang dari 0.50. Model 3 dapat dinyatakan sebagai model yang lebih baik dari model 1, dengan nilai koefesien deterministik (R2) sebesar 0.38944 dan nilai MAPE sebesar 21.21732% dibandingkan dengan model 1, dengan nilai R2 sebesar -0.43704 dan nilai MAPE sebesar 33.75404%.
Keyword: bitcoin, prediksi, GSA, gaussian