An Impact Assessment Method of Dam/Sluice on Instream Ecosystem and its Application to the Bengbu Sluice of China

A method is presented for impact evaluation of dams/sluices on their downstream aquatic ecosystems in the absence of detailed long-sequence ecosystem data It is based on the analysis of relations between indices of water quality and aquatic organisms It can be applied to a river section lack of water ecosystem data For this study it was used to evaluate the effects of the Bengbu Sluice (BS), a typical sluice in the Huai River in China Results indicate that in April and May the impact of BS on different downstream aquatic organisms varied The most significant impact was on phytoplank ton, with 91 7% of phytoplankton indices showing a 100% increase in quantity and biomass The second most significant was on zooplankton with 60 0% of zooplank ton showing greater increase in quantity and biomass The least significant impact was on zoobenthos, with only 33 3% showing greater increase in quantity and biomass Most of these organisms have higher pollution-resistibility These findings suggest that the present operation scheme will gradually lead to biodiversity decrease in the downstream aquatic ecology system, which will harm the instream aquatic ecology Overall, BS has a negative impact on the downstream aquatic ecology system It is argued that, in order to reduce the negative impact on the downstream aquatic ecology system, the operation of BS needs to be improved so that the discharge into the downstream river course is increased Data comparison of the aquatic ecosystem condition between 1982 and 2006 also demonstrates the decreasing aquatic ecosystem quality downstream of B

Sichere Videokommunikation fuer Multimedia Collaboration Teleservices (MMC). Teilvorhaben: Sicherheitsaspekte Schlussbericht

1. Current State: The running system is the only one we know, including security services. The method providing the security are state of the art. Goal of the Project: The goal was introducing security into a running conference system without disturbing it to much. It was evaluated whether it is possible to build a security envelope around a system or not to achieve this goal. During the project it was also evolved which features are required and how they can be introduced into the system. 2. Methods: In order to define what methods are necessary a security profile was developed. Well known security methods were tested whether they fit to the profile or not and implemented prototypically. During the development of the system new methods were checked and compared to the implemented ones. To avoid unnecessary work, similar methods were reused for similar tasks. 3. Results: The conference system fulfils all the requirements that where specified. It provides a prototypical implementation of a secure multimedia conference system. This conference system enables the user to choose between several security policies and changing security levels during a running conference. It is possible to change these levels without changing the system itself. It was taken care to enable easy enhancements to the crypto algorithms used. During the project problems came up because the unsecure MMC did not take into account security in the specification and design of the system. Following recommendation can be derived: trying to introduce security into a system later on, is only meaningful if the system at least has design options to do so. If not it is better to implement a system from the scratch. 4. Conclusion: We suggest to develop a new conference system, based on the results of this project. A diploma thesis trying to develop first specifications is currently worked on at the PRZ. The developed prototype is designed to use broad band networks. Since most of the customers are unable to pay a broad band network to run a conference system on, it should be one goal of a new project to develop a system that runs on whatever net configuration a customer might have. (orig.)SIGLEAvailable from TIB Hannover: DtF QN1(74,43) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Proceedings of the Frontiers of Retrovirology Conference 2016

The emergence of pandemic retroviral infection in small ruminant