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: 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: Implementation of security protocol is using digital cash payment system supervised
Abstrak: Digital Cash is a payment tool that stores the information a long withdigital signatures as the authentication of digital money correctness using 64-bit RS Aalgorithm. Digital Cash,in essence,needs the support from a credible third party, usually the government and the banking industry. Important properties for the implementation of Digital Cash which will support the smooth running of the transaction process, are anonymous, portable, reusable and user friendly. The study involves three groups of mutual interactionsin the process of Digital Cash implementation, where a security protocol can be done online or offline without having to involve the credit car.
Keyword: Anonymous, digitalcash, digitalsignatures, onlinetransaction, 64-bit RSA