With the development of both hardware and deep neural network technologies, tremendous improvements have been achieved in the performance of automatic emotion recognition (AER) based on the video ...data. However, AER is still a challenging task due to subtle expression, abstract concept of emotion and the representation of multi-modal information. Most proposed approaches focus on the multi-modal feature learning and fusion strategy, which pay more attention to the characteristic of a single video and ignore the correlation among the videos. To explore this correlation, in this paper, we propose a novel correlation-based graph convolutional network (C-GCN) for AER, which can comprehensively consider the correlation of the intra-class and inter-class videos for feature learning and information fusion. More specifically, we introduce the graph model to represent the correlation among the videos. This correlated information can help to improve the discrimination of node features in the progress of graph convolutional network. Meanwhile, the multi-head attention mechanism is applied to predict the hidden relationship among the videos, which can strengthen the inter-class correlation to improve the performance of classifiers. The C-GCN is evaluated on the AFEW datasets and eNTERFACE 05 dataset. The final experimental results demonstrate the superiority of our proposed method over the state-of-the-art methods.
In order to expand the application of polypropylene (PP) composites in cryogenic environment, short carbon fiber (SCF) was used as the reinforcing phase and the surface of it was modified by graphene ...oxide (GO), and the maleic anhydride grafted PP (MAPP) was also used to enhance the interface compatibility between the fiber and the matrix. The effects of the GO‐modified SCF and the MAPP on the impact properties and dimensional stability of PP composites at cryogenic temperature (CT) (− 196°C) were investigated by systematic analysis of the interfacial properties and microstructure of the composites. The results show that the impact strength of the PP composites was effectively increased by 106.7% (CT) and 170.7% (room temperature), respectively, compared to pure PP. In addition, the transverse and longitudinal shrinkage of PP composites can be reduced to only 0.15% and 0.1%, respectively. The cryogenic impact strength and dimensional stability of PP composites has been greatly improved, which makes PP composites in the application under cryogenic environment is more promising.
Inspired by the 2D bilayer lipid membranes in nature, a unique supramolecular “push–pull” synergetic strategy toward self‐assembled 2D organic crystals (2DOCs) is proposed in this work, which can ...effectively suppress the interlayer 3D stacking while maintaining the assembly of the intralayer for 2D growth. For this purpose, a model molecule PF‐Py consisting of a planar supramolecular “attractor” and a nonplanar steric “repellor” is designed for the solution self‐assembly process. Well‐defined 2DOCs including crystal nanosheets and millimeter‐sized crystal films with layered amphiphile‐like packing are obtained, which is analogical to the cell membranes of living organisms. Thanks to the special packing mode, the 2DOCs have fascinating integrated photoelectric property, with high mobility of 7.8 × 10−2 cm2 V−1 s−1, high crystalline state photoluminescence quantum yield of 55%, and superior deep‐blue laser characteristics with a low threshold of 5.51 µJ cm−2. This supramolecular synergetic strategy advances the design of 2D organic semiconductor crystals for high performance optoelectronics.
Rational molecular design strategy toward 2D organic crystals (2DOCs) is necessary but rare. Here, a novel supramolecular “push–pull” strategy to guide the molecular design by integrating a planar segment and a nonplanar group into one molecule is developed. Thanks to the synergetic effect of the two groups, size controllable 2DOCs with superior integrated photoelectric property are realized.
The brittleness of epoxy resin (EP) and the smooth, inert surface of carbon fiber (CF) affects their interfacial interaction, making the composite exhibit poor interlaminar shear properties that ...significantly limit its practical application. In this paper, a 4,4‐diphenylmethane diisocyanate (MDI) layer was uniformly coated on short‐cut carbon fiber (SCF) by chemical bonding and physical cladding. The reaction of the isocyanate group of MDI with the active hydrogen in the epoxy system was used to form a strong chemical bond between EP and SCF to enhance the interfacial interaction. Moreover, the introduced SCF as filler can play a better connecting and anchoring role in the CF/EP composite, enabling better stress transfer and enhancing the integrity inside the composite. The coating of MDI on the surface of SCF and the efficient synergistic effect that it brings were successfully demonstrated by Fourier‐transform infrared, thermogravimetric analyzer, dynamic mechanics analyzer, scanning electron microscopy, and interlaminar shear strength characterization. Compared with the untreated SCF reinforced CF/EP composite, MDI@SCF enhanced the interlaminar performance of the material by 10.06%. When the concentration of MDI treatment solution and SCF content was adjusted to the optimal value, the interlayer performance of the material increased by 17.01% compared to the pure CF/EP composite.
To improve interlaminar shear strength (ILSS) of ramie fiber (RF) reinforced polypropylene (PP) composites, graphene oxide (GO) with different particle sizes (ca. 1, 5 and 40 μm) are employed to ...treat the RF surfaces. Untreated and GO-treated RF/PP composites are then prepared by hot press. The combined effect of the GO size and content is examined on the ILSS of the RF reinforced PP composites. Moreover, the wrinkle morphology of GO surfaces is considered to play a mechanical interlocking role in improving the interfacial bonding between RFs and PP matrix, thus enhancing stress transfer from the PP matrix to the RFs. Consequently, the observed maximum improvement of about 40% in the ILSS of the PP composite by GO treatment of appropriate size and content is reasonably interpreted mainly via GO aspect ratio, GO aggregation and PP crystallinity.
Microhaplotypes are an emerging type of forensic genetic marker that are expected to support multiple forensic applications. Here, we developed a 124-plex panel for microhaplotype genotyping based on ...next-generation sequencing (NGS). The panel yielded intralocus and interlocus balanced sequencing data with a high percentage of effective reads. A full genotype was determined with as little as 0.1 ng of input DNA. Parallel mixture experiments and in-depth comparative analyses were performed with capillary-electrophoresis-based short tandem repeat (STR) and NGS-based microhaplotype genotyping, and demonstrated that microhaplotypes are far superior to STRs for mixture deconvolution. DNA from Han Chinese individuals (n = 256) was sequenced with the 124-plex panel. In total, 514 alleles were observed, and the forensic genetic parameters were calculated. A comparison of the forensic parameters for the 20 microhaplotypes with the top A
values in the 124-plex panel and 20 commonly used forensic STRs showed that these microhaplotypes were as effective as STRs in identifying individuals. A linkage disequilibrium analysis showed that 106 of the 124 microhaplotypes were independently hereditary, and the combined match probability for these 106 microhaplotypes was 5.23 × 10
. We conclude that this 124-plex microhaplotype panel is a powerful tool for forensic applications.
Fiber-reinforced polymer composite laminate is weak in the
Z
-direction, which limits its application. Herein, short carbon fiber (SCF) was decorated with graphene oxide (GO) to form GO@SCF, which ...was used to improve epoxy matrix and thereby the interlaminar shear strength (ILSS) of carbon fiber fabric (CFF)-reinforced epoxy composites. The effect of GO@SCF on the ILSS of the composite has been examined. It showed that the optimal content of GO@SCF was 0.1 wt%, and the maximum value of ILSS reached 59.4 MPa, which was 14.7% higher than the pure CFF/epoxy composite. The neat SCF was also employed to enhance the ILSS for the purpose of comparison. The results indicate that GO@SCF has better effect on reinforcing the ILSS than the neat SCF. This study provides an effective approach for the reinforcement of the ILSS of CFF-reinforced epoxy composites.
Person re-identification plays important roles in many practical applications. Due to various human poses, complex backgrounds and similarity of person clothes, person re-identification is still a ...challenging task. In this paper, we mainly focus on the robust and discriminative appearance feature representation and proposed a novel multi-appearance method for person re-identification. First, we proposed a deep feature fusion method and get the multi-appearance feature by combining two Convolutional Neural Networks. Then, in order to further enhance the representation of the appearance feature, the multi-part model was constructed by combining the whole body and the six body parts. Additionally, we optimized the feature extraction process by adding a pooling layer. Comprehensive and comparative experiments with the state-of-the-art methods over publicly available datasets demonstrated that the proposed method can get promising results.
In this study, nano Fe3O4 functionalized graphene oxide (Fe3O4@GO) was employed to enhance the interlaminar shear strength (ILSS) of carbon fabric/epoxy (CF/EP) composites. The composite was ...fabricated via a vacuum-assisted resin transfer molding process under a magnetic field. The microstructure and reinforcement mechanism of the CF/EP composite was further investigated. The results indicate that the Fe3O4@GO can increase the ILSS of the CF/EP composite by 12.9%, and it can further enhance it to 41% under the magnetic field orientation. Furthermore, it was observed that the oriented Fe3O4@GO can also improve the flexural strength and tensile strength of the CF/EP composite by 29.7% and 40.9%, respectively. The main reason is that the oriented GO arrangement is better ordered and thus can withstand more lateral loads inside the composite.
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•The interlaminar shear strength (ILSS) of a CF/EP composite can be effectively improved by oriented Fe3O4@GO.•The Fe3O4@GO can form an oriented structure in the CF/EP composites by magnetic field orientation.•The optimal content of oriented Fe3O4@GO for enhancing the ILSS of the CF/EP composite is 1 wt%.•The optimal molar ratio of Fe2+ and Fe3+ for preparing Fe3O4@GO was found to be 1:1.25.
Sepsis is an acute inflammatory reaction and a cause of acute respiratory distress syndrome (ARDS). In the present study, we explored the roles and underlying mechanism of the lncRNA Nuclear enriched ...abundant transcript 1 (NEAT1) in ARDS. The expression levels of genes, proteins and pro-inflammatory cytokines in patients with ARDS, LPS-stimulated cells and septic mouse models were quantified using qPCR, western blotting and ELISA assays, respectively. The molecular targeting relationship was validated by conducting a dual-luciferase reporter assay. Cell proliferation was assessed using the Cell Counting Kit-8 (CCK-8) assay. The cell cycle phase was determined by flow cytometry assay. The expression levels of NEAT1 and pro-inflammatory cytokines were higher in patients with ARDS and septic models than in controls. Knockdown of NEAT1 significantly increased cell proliferation and cycle progression and prolonged mouse survival in vitro and in vivo. Mechanistically, miR-27a was identified as a downstream target of NEAT1 and directly inhibited PTEN expression. Further rescue experiments revealed that inhibition of miR-27a impeded the promoting effects of NEAT1 silence on cell proliferation and cycle progression, whereas inhibition of PTEN markedly weakened the inhibitory effects of NEAT1 overexpression on cell proliferation and cycle progression. Altogether, our study revealed that NEAT1 plays a promoting role in the progression of ARDS via the NEAT1/miR-27a/PTEN regulatory network, providing new insight into the pathologic mechanism behind ARDS.
Sepsis-induced acute lung injury has been clinically defined as acute respiratory distress syndrome (ARDS). In the present study, the authors reveal that NEAT1 plays a role in the inflammation and cell cycle progression of ARDS via the NEAT1/miR-27a/PTEN regulatory network, providing new insight into the pathologic mechanism behind ARDS.
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