Triple critical feature capture network: A triple critical feature capture network for weakly supervised object detection

Weakly supervised object detection (WSOD) is becoming increasingly important for computer vision tasks, as it alleviates the burden of manual annotation. Most WSOD techniques rely on multiple instance learning (MIL), which tends to localise the discriminative parts of salient objects instead of the whole object. In addition, network training is often supervised using simple image-level annotations, without including object quantities or location information. However, this can lead to ambiguous differentiation of object instances, both in terms of location and semantics. To address these issues, propose an end-to-end triple critical feature capture network (TCFCNet) for WSOD is proposed. Specifically, a multi-task branch, which can perform fully supervised classification and regression task, was integrated with a PCL in an end-to-end network for refining object locations in an online method. A cyclic parametric dropblock module (CPDM) was then designed to help the detector focus on the contextual information by using cyclic masking techniques to maximise the removal of the discriminative components of an object instance to alleviate the part domination problem. Finally, a feature decoupling module (FDM) is proposed to further reduce the ambiguous distinction of object instances by adaptively constructing robust critical features that adapt to multi-task branch for classification and regression tasks, which contains a feature enhancement module and task-specific polarisation functions. Comprehensive experiments are carried out on the challenging Pascal VOC 2007 and VOC 2012 datasets. The proposed method achieves a 54.6% mAP and a 44.3% mAP on the Pascal VOC 2007 and VOC 2012 datasets respectively, showed that our method outperformed existing mainstream techniques by a considerable margin

Green and Efficient Acquirement of Unsaturated Ether from Direct and Selective Hydrogenation Coupling Unsaturated Aldehyde with Alcohol by Bi-Functional Al-Ni-P Heterogeneous Catalysts

In view of the industrial importance of high-grade unsaturated ether (UE) and the inconvenience of acquiring the compound, herein, a series of low-cost Al-Ni-P catalysts in robust AlPO4/Ni2P structure possessing novel bi-functional catalytic features (hydrogenation activation and acid catalysis) were innovated, and testified to be efficient for directly synthesizing UE with a superior yield up to 97% from the selective hydrogenation coupling carbonyl of unsaturated aldehyde (cinnamaldehyde or citral) with C1–C5 primary or secondary alcohol under 0.1 MPa H2 and 393 K. The integrated advantages of high efficiency, green manner and convenient operation of the present heterogeneous catalytic system gave the system potential for feasibly harvesting high-grade unsaturated ether in related fine chemical synthesis networks

A supramolecular organic framework with ant topology featuring interdigitation and interpenetration

<div><p>H₄BOPTC reacts with IMI to yield a supramolecular organic framework, formulated as [IMIH⁺]₂√[H₂BOPTC^2 −]√0.5H₂O (<b>1</b>) (IMI = imidazole, H₄BOPTC = benzophenone-3,3′,4,4′-tetracarboxylic acid). Single-crystal X-ray diffraction analysis reveals that <b>1</b> shows a novel architecture with two-level hierarchical entanglement. H₂BOPTC^2 − connects to IMIH⁺ through hydrogen bonds, providing 1D ribbon. The basic ribbons are entangled into a 3D net with <b>ant</b> topology. Then the <b>ant</b> nets further interpenetrate to give the final entangled framework. The thermal stability, optical band gap energy and photoluminescent property of <b>1</b> have also been investigated.</p></div