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The acoustic properties including sound speed and the attenuation coefficient are important factors which determine the efficacy of acoustic equipments and targets detection of seafloor sediments. This paper presents a multi-mode acoustic in situ measurement system to be used in the deep sea. We analyzed the major system framework and relevant hardware and software. The proposed system provides two...
An advanced three-dimensional finite-element S-parameter-simulation tool for microwave tubes is designed. This simulator is based on the second order hierarchical vector finite element method and the proposed combining p-type multigrid and multifrontal block incomplete Cholesky preconditioner. This simulator has shown the high available accuracy and the high-efficiency computational performance for...
With the proliferation of virtualization and cloud related technologies, computing, storage and network resources provided by physical devices are virtualized and integrated into a resource pool. For cloud resources tenants, they can apply these resources for use in a self-service style. The resources applying process is much simpler than ever. However, for the data center administrator, in confronting...
Cloud services decouple cloud applications from IT infrastructure in cloud environment. On demand resources provisioning pattern makes high efficient resource utility and application dynamic scaling possible. Hence Cloud data center could provide infrastructure capabilities in a more energy efficient way. However, there exists a tradeoff between energy efficiency and application service level objectives...
With the increased requirements of environmental protection, the problem of industrial boiler NOx emissions become more and more notable. The practical coal and the same air-distribution method as the one in the actual stoker boiler were applied to study the NOx formation characteristics in a unit-boiler with the purpose of studying the NOx formation characteristics in the chain-boiler. Measuring...
Relying on the background of large section soil tunnel engineering, the numerical simulation on three excavation methods for soil tunnel including bench method, arch heading method and cross diaphragm were carried out. Results show that the arch heading method is confirmed as optimum for this project by comparative analysis. And then, according to the monitoring results of the arch heading method,...
Clustering is an energy efficient method for wireless sensor network monitoring. Existed algorithms are mostly location-based, where physical temporal-spatial correlations are considered, leading to a poor data compression rate. This paper proposes a novel data correlation based clustering approach. A greedy algorithm, minimum degree first clustering algorithm, is introduced to cluster the sensor...
The circulating current method can judge whether the multipoint earthing fault happens by monitoring the variety of metal sheath's circulating current value. This article introduce an on-line monitoring system which use the circulating current method to monitor the multipoint earthing fault of the metal sheath. In the hardware layer, we use distributed current sensors and microcontroller's acquisition...
Research results on the sample decision service systems based on China's Next Generation Internet (CNGI) environment are related. There are sub-systems, i.e. the system on CNGI application management, on natural resource-environment & sustainable development, on disease preventing, controlling and emergency reaction, on bio-diversity and ecological safety, and on regional tourism service and decision...
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