A Table Detection Method for Multipage PDF Documents via Visual Seperators and Tabular Structures

Table detection is always an important task of document analysis and recognition. In this paper, we propose a novel and effective table detection method via visual separators and geometric content layout information, targeting at PDF documents. The visual separators refer to not only the graphic ruling lines but also the white spaces to handle tables with or without ruling lines. Furthermore, we detect page columns in order to assist table region delimitation in complex layout pages. Evaluations of our algorithm on an e-Book dataset and a scientific document dataset show competitive performance. It is noteworthy that the proposed method has been successfully incorporated into a commercial software package for large-scale Chinese e-Book production.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000343450700153&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Computer Science, Artificial IntelligenceEngineering, Electrical & ElectronicCPCI-S(ISTP)

Investigating Underlying Mechanisms for Nonfullerene Hybrid Bulk Heterojunctions‐Based Organic Magnetoresistance

Abstract Nonfullerene acceptors (NFAs) are potential candidates for high‐performance organic solar cells. As a group of promising organic optoelectronic materials, it is of particular importance to further explore while establishing their novel functionalities for other critical applications such as low power consumptions and high‐speed organic spintronic devices for data storage and memories. Here, a joint of experimental and theoretical studies are performed for the magneto‐transport in PM6:Y6 and PBDB‐T: ITIC‐based prototypical nonfullerene hybrid bulk heterojunction (BHJ) systems. Robust magnetic‐driven behaviors can be realized due to the existence of charge transfer states (CTS) for the systems. Largely stable high and low resistive states can be well achieved through a wide temperature range from 300 K to 4 K. Magneto‐responses are dealt with at different field strengths separately based on microscopically theoretical models. The interior spin dynamics lay primarily on field‐induced coherent spin mixing mechanisms. The main channels for pronounced OMR effects with negative signs stem from the triplet exciton‐polaron interaction and coulomb blockade hopping transport upon charge injection. More importantly, the polaron back transfer (PBT) turns out to be desirable for nonfullerene molecular spintronics. This study opens a new avenue for novel applications of NFAs in organic spintronics

A metal-free and recyclable synthesis of benzothiazoles using thiourea as a sulfur surrogate

[Display omitted] Using odorless thiourea as the S source, benzothiazoles and asymmetric disulfides could be obtained from thioformanilides through the tandem cyclization/nucleophilic addition/hydrolysis/nucleophilic substitution reaction. Furthermore, the obtained asymmetric disulfides could readily transfer to benzothiazoles after nitro-reduction and amide formation reaction. This metal-free and recyclable synthetic methodology offered a time-efficient, less expensive, and environmentally friendly alternative to multifunctional benzothiazoles