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A General Linguistic Steganalysis Framework Using Multi-Task Learning

Computer Systems Science & Engineering 2023年第8期46卷 2383-2399页

作者： Lingyun Xiang Rong Wang yuhang liu Yangfan liu Lina Tan School of Computer and Communication Engineering Changsha University of Science and TechnologyChangsha410114China School of Computer Science and Electronic Engineering University of EssexColchesterCO43SQUK School of Computer Science Hunan University of Technology and BusinessChangsha410205China

Prevailing linguistic steganalysis approaches focus on learning sensitive features to distinguish a particular category of steganographic texts from non-steganographic texts,by performing binary *** it remains an unsolved problem and poses a significant threat to the security of cyberspace when various categories of non-steganographic or steganographic texts *** this paper,we propose a general linguistic steganalysis framework named LS-MTL,which introduces the idea of multi-task learning to deal with the classification of various categories of steganographic and non-steganographic ***-MTL captures sensitive linguistic features from multiple related linguistic steganalysis tasks and can concurrently handle diverse tasks with a constructed *** the proposed framework,convolutional neural networks(CNNs)are utilized as private base models to extract sensitive features for each steganalysis ***,a shared CNN is built to capture potential interaction information and share linguistic features among all ***,LS-MTL incorporates the private and shared sensitive features to identify the detected text as steganographic or *** results demonstrate that the proposed framework LS-MTL outperforms the baseline in the multi-category linguistic steganalysis task,while average Acc,Pre,and Rec are increased by 0.5%,1.4%,and 0.4%,*** ablation experimental results show that LS-MTL with the shared module has robust generalization capability and achieves good detection performance even in the case of spare data.

关键词： Linguistic steganalysis multi-task learning convolutional neural network(CNN) feature extraction detection performance

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Discrimination of maleic hydrazide polymorphs using terahertz spectroscopy and density functional theory

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Optoelectronics Letters 2023年第8期19卷 493-497页

作者： ZHENG Zhuanping ZHAO Shuaiyu liu yuhang GONG Jiamin School of Electronic Engineering Xi’an University of Posts&TelecommunicationXi’an 710121China

The terahertz(THz) absorptions of maleic hydrazide polymorphs(MH2 and MH3) have been measured utilizing terahertz time-domain spectroscopy(THz-TDS).MH2 and MH3 have displayed totally different THz absorption features compared to their basically identical infrared spectral *** THz spectrum of MH2 showed six distinct absorption features while MH3 demonstrated five characteristic absorption peaks in the range of 10—160 cm^(-1).Spectral interpretation has been carried out in the framework of density functional theory(DFT) using periodic unit cell *** simulation yields a good quality with respect to the measured *** analysis into the mode of vibration showed that the low-frequency THz spectral features(<112 cm^(-1)) are contributed by intermolecular interactions mediated by in-plane/out-of-plane collective *** varied intermolecular interactions and crystal habits are the primarily reason for the THz spectral differences of MH2 and MH3.

关键词： absorption spectroscopy functional

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Perturbation of the Weighted T-Core-EP Inverse of Tensors Based on the T-Product

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Communications in Mathematical Research 2021年第4期37卷 496-536页

作者： yuhang liu Haifeng Ma School of Mathematical Science Harbin Normal UniversityHarbin 150025P.R.China

In this paper,we extend the notion of the T-Schur decomposition to the weighted T-core-EP ***,the weighted T-core-EP inverse of rectangular tensors is defined by a system,and its existence and uniqueness are ***,the perturbation of the weighted T-core-EP inverse is studied under several conditions,and the relevant examples are provided to verify the perturbation bounds of the weighted T-core-EP inverse of tensors.

关键词： T-product tensor perturbation analysis weighted T-core-EP inverse

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Promoting Electrocatalytic CO_(2) Reduction to CO via Sulfur-Doped Co-N-C Single-Atom Catalyst

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Chinese Journal of Chemistry 2023年第24期41卷 3553-3559页

作者： Zhiming Wei yuhang liu Jie Ding Qinye He Qiao Zhang Yueming Zhai The Institute for Advanced Studies Wuhan UniversityWuhanHubei430072 China School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhouJiangsu215009 China

Electrocatalytic reduction of CO_(2) to fuels and chemicals possesses huge potential to alleviate current environmental *** doping in metal-nitrogen-carbon(M-N-C)single-atom catalysts(SACs)has been found to be capable to promote the electrocatalytic CO_(2) reduction reaction(CO_(2)RR).However,the origin of the enhanced activity is still ***,we report that sulfur-doped cobalt-nitrogen-carbon single-atom catalyst(Co1-SNC)exhibits superior CO_(2)RR performance compared to sulfur-free counterpart(Co1-NC).On the basis of in situ attenuated total reflectance surface-enhanced infrared absorption spectroscopy(ATR-SEIRAS),kinetic isotope effect(KIE)and theoretical calculation,it is demonstrated that sulfur doping can promote water activation,elevate the d-band center of Co active site,and reduce the free energy of*COOH intermediate *** work deepens the understanding of the CO_(2)RR chemistry over heteroatom-doped SACs for designing efficient CO_(2)RR processes.

关键词： Electrocatalytic CO_(2)reduction Doping Heterogeneous catalysis Single-atom catalysts ATR-SEIRAS

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Synthesis and Characterization of Phenyl Camellia oleifera Seed Oil Ester Plasticizing PVC

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Journal of Renewable Materials 2024年第3期12卷 615-628页

作者： Wenqing Xiao yuhang liu Yuxin He Qiaoguang Li Yongquan Li College of Chemistry and Chemical Engineering Zhongkai University of Agriculture and EngineeringGuangzhou510225China College of Chemical Engineering Zhejiang University of TechnologyHangzhou310000China Key Laboratory of Germplasm Platform and Ornamental Plants College of Horticulture and Landscape ArchitectureZhongkai University of Agriculture and EngineeringGuangzhou510225China

Plasticizers are essential additives in the processing of polyvinyl chloride(PVC),with phthalate plasticizers being widely ***,these conventional plasticizers have been shown to be harmful to human health and environmentally unfriendly,necessitating the exploration of eco-friendly bio-based *** this study,Camellia oleifera seed oil,a specialty resource in China,was utilized as a raw material and reacted with 4,4′-Methylenebis(N,N-diglycidylaniline)(AG-80)to synthesize Phenyl Camellia seed Oil Ester(PCSOE).PCSOE was employed as a plasticizer to prepare modified PVC films with varying concentrations,with the conventional plasticizer dioctyl phthalate(DOP)serving as a *** results demonstrate that PSCOE-plasticized PVC films exhibit enhanced hydrophilicity,tensile strength,and thermal stability compared to DOP-modified PVC *** contact angle of PSCOE-plasticized PVC films ranges from 66.26°to 78.48°,which is generally lower than the contact angle of DOP-modified PVC films at 78.40°,indicating improved hydrophilicity due to the modification with *** tensile strength of PSCOE-plasticized PVC films ranges from 17.73 to 20.17 MPa,all surpassing the value of 16.41 MPa for DOP-modified PVC ***,the temperatures corresponding to 5%,10%,and 50%weight loss for PVC samples modified with PCSOE are higher than those for ***,PCSOE presents a viable alternative to DOP as a plasticizer for PVC materials.

关键词： Polyvinyl chloride(PVC) Camellia oleifera seed oil 4,4′-Methylenebis(N,N-diglycidylaniline) bio-based plasticizer

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Mechanically robust and dynamic supramolecular polymer networks enabled by[an]daisy chain backbones

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Science China Chemistry 2024年第12期67卷 4234-4241页

作者： Yongming Wang Yi Ding yuhang liu Shaolei Qu Wenbin Wang Wei Yu Zhaoming Zhang Feng liu Xuzhou Yan School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Supramolecular polymer networks(SPNs)have garnered significant research interest due to their dynamic ***,while current developments primarily focus on managing supramolecular crosslinks,the role of polymer backbones—equally crucial to SPN properties—has not yet been sufficiently ***,we utilize mechanically interlocked[an]daisy chain as backbone to prepare a class of SPNs,where the force-induced motion of successive mechanical bonds toughens and reinforces the *** specific,the[an]daisy chain backbones connect with polynorbornene chains through quadruple H-bonding in the SPN *** to the control with non-slidable backbone,The representative SPN-2 exhibits a robust feature in tensile tests with high maximum stress(14.7 vs.7.89 MPa)and toughness(83.8 vs.48.6 MJ/m^(3)).Moreover,it also has superior performance in energy dissipation benefitting from the[an]daisy chain backbones as well as supramolecular ***,the SPN-2 displayed exceptional self-healing and reprocessing capabilities due to their dynamic quadrable H-bonding *** findings demonstrate the untapped potential of[an]daisy chain as a polymer skeleton to develop SPNs and open the door to design mechanically robust supramolecular materials with diverse smart functions.

关键词： supramolecular polymer networks mechanical bond [an]daisy chains self-healing dynamic materials

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Approaching Ultimate Synthesis Reaction Rate of Ni-Rich Layered Cathodes for Lithium-Ion Batteries

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Nano-Micro Letters 2024年第10期16卷 392-402页

作者： Zhedong liu Jingchao Zhang Jiawei Luo Zhaoxin Guo Haoran Jiang Zekun Li yuhang liu Zijing Song Rui liu Wei-Di liu Wenbin Hu Yanan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072People's Republic of China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590People's Republic of China Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt LuciaQLD 4072Australia

Nickel-rich layered oxide LiNi_(x)Co_(y)MnzO_(2)(NCM,x+y+z=1)is the most promising cathode material for high-energy lithium-ion ***,conventional synthesis methods are limited by the slow heating rate,sluggish reaction dynamics,high energy consumption,and long reaction *** overcome these chal-lenges,we first employed a high-temperature shock(HTS)strategy for fast synthesis of the NCM,and the approaching ultimate reaction rate of solid phase transition is deeply investigated for the first *** the HTS process,ultrafast average reaction rate of phase transition from Ni_(0.6)Co_(0.2)Mn_(0.2)(OH)_(2) to Li-containing oxides is 66.7(%s^(-1)),that is,taking only 1.5 *** ultrahigh heating rate leads to fast reaction kinetics,which induces the rapid phase transition of NCM *** HTS-synthesized nickel-rich layered oxides perform good cycling performances(94%for NCM523,94%for NCM622,and 80%for NCM811 after 200 cycles at 4.3 V).These findings might also assist to pave the way for preparing effectively Ni-rich layered oxides for lithium-ion batteries.

关键词： Nickel-rich layered oxides High-temperature shock Solid reaction kinetics Phase transition Reaction rate

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Carbon dots-enhanced pH-responsive lubricating hydrogel based on reversible dynamic covalent bondings

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Chinese Chemical Letters 2024年第5期35卷 232-237页

作者： Jianye Kang Xinyu Yang Xuhao Yang Jiahui Sun yuhang liu Shutao Wang Wenlong Song State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China CAS Key Laboratory of Bio-inspired Materials and Interfacial Science CAS Center for Excellence in NanoscienceTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Due to the various pH liquid environment in nature,the pH-responsive lubricating hydrogel is widely investigated and developed for tissue interface ***,the applied liquid environment will lead to poor mechanical property and weaken the pH-responsive *** this work,a carbon dotsenhanced pH-responsive lubricating hydrogel is developed by combining a pH-responsive section of dynamic PVA-borax network into a PAAm covalent polymer *** formed hydrogel presents a partial gel-sol transition under controlled pH *** low pH environments(<6.0),the formed lubricating layer originated from dynamic disassembly of PVA-borax hydrogel,and brings the lubricating properties on the hydrogel ***,the mechanical strength and lubrication properties are well promoted by introducing the carbon dots into the hydrogel,the blue sol layer can be observed more visually under the fluorescence *** pH-response also exhibits well *** prepared hydrogel broadens the idea for designing pH-responsive soft materials for soft lubricating actuator or robot.

关键词： pH-responsive Carbon dots Dynamic covalent bonding Lubrication

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Chemically tailored molecular surface modifiers for efficient and stable perovskite photovoltaics

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SmartMat 2021年第1期2卷 33-37页

作者： yuhang liu Bitao Dong Anders Hagfeldt Jingshan Luo Michael Graetzel Laboratory of Photonics and Interfaces École Polytechnique Fédérale de LausanneLausanneSwitzerland Laboratory of Photomolecular Science École Polytechnique Fédérale de LausanneLausanneSwitzerland Institute of Photoelectronic Thin Film Devices and Technology Solar Energy Research CenterKey Laboratory of Photoelectronic Thin Film Devices and Technology of TianjinMinistry of Education Engineering Research Center of Thin Film Photoelectronic TechnologyRenewable Energy Conversion and Storage CenterNankai UniversityTianjinChina

Perovskite solar cells(PSCs)have attracted intense attention based on their high power conversion efficiency and low production ***,due to the polycrystalline nature and the intrinsic hydrophilicity of the metal halide perovskite moieties,the photovoltaic performance of PSCs is largely limited by defects within the polycrystalline perovskites and the sensitivity to *** this perspective,we focus on the chemically tailored interface materials to passivate the defects and improve the moisture stability of ***,we provide a brief overview of various molecular interface *** we provide examples from our recent work on organic ammonium halide‐based passivation materials as representatives to illustrate the design strategies and the modification *** the end,we shed light on the future devel-opment of organic ammonium halides for applications in PSCs.

关键词： organic ammonium halide perovskite solar cell surface modification

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Advances in the Emerging Gradient Designs of Li Metal Hosts

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Research 2022年第4期2022卷 741-756页

作者： Wanqing Guan Xiaoqi Hu yuhang liu Jinmeng Sun Chen He Zhuzhu Du Jingxuan Bi Ke Wang Wei Ai Frontiers Science Center for Flexible Electronics(FSCFE) Xi'an Institute of Flexible Electronics(IFE)and Xian Institute of Biomedical Materials Engineering(IBME)Northwestern Polytechnical University(NPU)127 West Youyi RoadXi'an710072China School of Materials Science and Engineering Nanyang Technological University50 Nanyang AvenueSingaporeSingapore 639798

Developing host has been recognized a potential countermeasure to circumvent the intrinsic drawbacks of Li metal anode(LMA),such as uncontrolled dendrite growth,unstable solid electrolyte interface,and infinite volume *** realize proper Li accommodation,particularly bottom-up deposition of Li metal,gradient designs of host materials including lithiophilicity and/or conductivity have attracted a great deal of attention in recent ***,a critical and specialized review on this quickly evolving topic is still *** this review,we attempt to comprehensively summarize and update the related advances in guiding Li nucleation and ***,the fundamentals regarding Li deposition are discussed,with particular attention to the gradient design principles of host ***,the progress of creating diferent gradients in terms of lithiophilicity,conductivity,and their hybrid is systematically ***,future challenges and perspective on the gradient design of advanced hosts towards practical LMAs are provided,which would provide a useful guidance for future studies.

关键词： conductivity unstable electrolyte

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