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Ultrathin sulfur-doped g-C3N4 porous nanosheets (SCNNSs) with large lateral size and carbon vacancies were obtained by directly collecting the gaseous product of thiourea under a self-generated NH3 atmosphere. The NH3 atmosphere promoted the formation of sulfur doped g-C3N4 nanosheets with a hierarchical pore structure and a high specific surface area. Carbon vacancies were also generated in the SCNNSs...
This paper introduces our system competing in MSR-Bing Image Retrieval Challenge at ICME 2014. The task of the challenge is to rank images by their relevance to a given topic, by leveraging cues hidden in search engine's click log. With the successful trial in last year's challenge, search-based method is shown to be effective in this task. We reserve the basic idea of search-based method in our new...
In relational databases and their applications, an important issue is to evaluate a stream of top-N selection queries. For this issue, we propose a new method with learning-based strategies and region clustering techniques in this paper. This method uses a knowledge base to store related information of some past queries, groups the search regions of the past queries into larger regions and retrieves...
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