Judul: Pengaruh Manajemen Naungan Stup terhadap Aktivitas Terbang `Galo-galo (Trigona drescheri) di Sumanik Sumatera Barat
Abstrak: Trigona drescheri merupakan spesies stingless bees yang berpotensi memproduksi propolis dan produktivitasnya dipengaruhi oleh aktivitas terbang pekerja. Atap asbes dan PVC digunakan sebagai naungan dalam penelitian ini dengan tujuan memperoleh informasi tentang aktivitas terbang lebah Trigona. Pengamatan dilakukan selama 10 menit per jam, yakni dari pukul 07.00-18.00. Suhu udara, kelembaban relatif, dan intensitas cahaya juga diukur. Waktu pengamatan pada pukul 07.00-17.00 meningkatkan aktivitas terbang lebah dan mencapai jumlah tertinggi antara pukul 15.00-17.00, kemudian menurun hingga pukul 18.00. Suhu udara (r=0.980 dan R2 =0.962 pada asbes; r=0.976 dan R 2 =0.953 pada PVC) dan kelembaban relatif (r=0.979 dan R2 =0.960 pada asbes; r=0.984 dan R2 =0.970 pada PVC) nyata (P<0.05) mempengaruhi aktivitas terbang T. drescheri. Intensitas cahaya tidak berpengaruh terhadap aktivitas terbang. Suhu 25-30 oC dan kelembaban relatif 60%-78% merupakan kondisi optimal bagi T. drescheri untuk beraktivitas terbang. Stup yang diletakkan di bawah atap PVC menghasilkan aktivitas terbang lebah yang nyata lebih tinggi (P<0.05) dari pada atap asbes.
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Judul: Aktivitas Terbang dan Produktivitas Lebah Trigona laeviceps pada Bahan Stup Kayu Sengon dan Kayu Lapis (Plywood)
Abstrak: Trigona laeviceps is one of stingless bees species which produce propolis and its productivity influenced by flight activity of the workers. This study aimed to obtain stup material place Trigona hive which may improve the weight of bees colony and increase production of propolis. The weight gain of colony was counted every week while propolis+bee pollen and honey was measured at the end of the study. Temperature, internal temperature, relative humidity, light intensity and wind speed were also measured. Daily flight activity of Trigona for obtain pollen/resin and nectar/water on sengon stup was very significantly higher (p<0.01) compared to the bees kept in plywood stup (80.40±41.40 vs 42.33±21.90 bees/day). The light intensity affect the daily flight activity (R2=78.3% in sengon stup and R2= 85.6% in stup plywood). Colony weight gain on sengon stup was significantly higher (p<0.05) as compared to those on plywood stup (23.70 vs -−8.44 g/week). Whereas the production of propolis+bee pollen and honey were not significantly different (24.77 and 19.66 vs 19.92 and 17.61 g/8 weeks).
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Judul: Sistem Ijazah Digital dengan Layanan Keamanan Perlindungan Hak Cipta Menggunakan Watermark dan Digital Signature
Abstrak: The vulnerability of digital files against unauthorized use of copyright such as duplication, distribution, and modification of digital files illegally causing its validity is not guaranteed. Research is underway to design a security system granting copyright protection in the digital diploma file to accommodate the digital diploma proving the validity of the file. Security system in this study applies watermarking and digital signature techniques. DCT and PVMA algorithm is used to process watermarking and Tiger Hash and RSA algorithms to obtain a digital signature. The study focused on the digital signature of subsystems as well as system integrity. Security services provided data integrity and authentication with the marking. This security system has been implemented on a web-based client server system.
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