Judul: Aktivitas Terbang dan Pertambahan Bobot Koloni Trigona laeviceps laeviceps pada Bahan Stup Berbeda Sebelum dan Setelah Introduksi Introduksi Koloni Baru
Abstrak: This study aimed to obtain the information about the flight activity, determinant environmental factors and weight gain of Trigona laeviceps colonies which were placed in different materials of cages (sengon wood/ KS and plywood/ KL) after introduction of new ten colonies. Completely Randomized Design in a factorial experiment 2x2x13 was used. The first, second and third factors were materials, introduction of new colonies and time of observation respectively. Flight activity data were analyzed using Analysis of variance (ANOVA) and colony weight gain data were analyzed by T-test of 95% confidence interval. Observations on flight activity were conducted for every 10 minutes within an hour, from 06.00-18.00. Temperature, relative humidity, light intensity and wind speed were measured. The colonies average initial weight was 30-59 grams and then were weighed once a week. The range of daily flight activity was 0-20. Temperature, relative humidity and wind speed were not significantly influenced flight activity. Light intensity (R2=0.688) especially after introduction of new colonies was significantly influenced (P<0.05) flight activity. Flight activity and colony weight gain were not significantly influenced by stup material, but after introduction new colonies (P<0.05), flight activity was lower. Flight activity was significantly influenced (P<0.05) by time which form the specific pattern at peak time between 07.00-16.00
Keyword: colony weight gain, environment factor, flight activity, stup, Trigona.

Judul: Aktivitas Terbang dan Perkembangan Bobot Koloni Lebah Kelulut (Tetragonula laeviceps) di Kampus IPB Darmaga Bogor.
Abstrak: Lebah kelulut (Tetragonula laeviceps) merupakan salah satu jenis lebah yang tidak memiliki sengat (stingless bee) dan termasuk serangga sosial tingkat tinggi yang hidup berkoloni. Penelitian ini bertujuan untuk menguji aktivitas terbang keluar-masuk lebah kelulut dari sarang, pengaruh faktor lingkungan terhadap aktivitas terbang lebah kelulut, perkembangan bobot koloni, dan melihat potensi sumber pakan yang ada di sekitar lokasi penelitian. Hasil penelitian menunjukkan bahwa aktivitas terbanyak terjadi pada pukul 09.00 WIB (keluar sarang), 11.00 WIB (masuk sarang), 07.00 WIB (membawa polen). Analisis korelasi Spearman menunjukkan bahwa aktivitas keluar dan masuk sarang dipengaruhi oleh intensitas cahaya. Nilai korelasi yang diperoleh yaitu rs = 0.414, p > 0.01 (keluar sarang) dan rs = 0.470, p < 0.01 (masuk sarang). Aktivitas membawa polen dipengaruhi oleh kelembaban relatif dengan nilai rs = 0.705, p < 0.05. Selama dua bulan pengamatan, perkembangan bobot koloni didapatkan hasil sebesar 8.1%. Potensi sumber pakan di sekitar lokasi penelitian cukup melimpah. Didapatkan sebanyak 20 jenis tanaman bunga maupun tegakan yang mengandung nektar, polen, serta resin.
Keyword: aktivitas, lingkungan, sumber pakan, Tertagonula laeviceps

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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