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基于一致性感知特征融合的高动态范围成像方法

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计算机学报 2024年第10期47卷 2352-2367页

作者：印佳丽韩津陈斌刘西蒙福州大学计算机与大数据学院福州350108 福州大学网络系统信息安全福建省高校重点实验室福州350108

高动态范围成像(High Dynamic Range Imaging,HDRI)技术是指通过融合多张低动态范围(Low Dynamic Range,LDR)图像拓展图像动态范围、完整图像内容的方法,其为解决由于相机传感器动态范围有限而导致所拍摄图像内容丢失的问题提供了实际... 详细信息

高动态范围成像(High Dynamic Range Imaging,HDRI)技术是指通过融合多张低动态范围(Low Dynamic Range,LDR)图像拓展图像动态范围、完整图像内容的方法,其为解决由于相机传感器动态范围有限而导致所拍摄图像内容丢失的问题提供了实际的解决方案.通过数十年的研究,众多有效的HDRI方法已被提出,并在无物体运动、内容曝光良好的静态场景中取得接近最优的性能.然而,现实场景中物体移动和相机偏移无法避免,直接使用传统HDRI方法会在融合后的HDR图像中产生严重的重影和伪影.这使得仅包含简单融合过程的HDRI方法并不适用于实际应用,现实场景中的HDRI任务仍然具有一定挑战.因此,针对动态场景下的HDRI研究迅速发展.近期的方法集中在借助深度卷积神经网络(Convolutional Neural Network,CNN)的力量以期实现更好的性能.在这些基于CNN的方法中,特征融合对于恢复图像完整内容、消除图像伪影方面起着至关重要的作用.传统的特征融合方法通过借助跳跃连接或注意力模块,首先将LDR图像的特征进行拼接,并通过堆叠的卷积操作逐渐关注不同的局部特征.然而,此类方案通常忽略了LDR图像序列之间丰富的上下文依赖关系,且未充分利用特征之间的纹理一致性.为解决这一问题,本文提出了一种全新的一致性感知特征融合(Coherence-Aware Feature Aggregation,CAFA)方案,该方案在卷积过程中对输入特征中位于不同空间位置但具有相同上下文信息的特征信息进行采样,从而显式地将上下文一致性纳入特征融合中.基于CAFA,本文进一步提出了一种结合CAFA的动态场景下一致性感知高动态范围成像网络CAHDRNet.为更好地嵌合CAFA方案,本文通过设计三个额外的可学习模块来构建CAHDRNet.首先,使用基于在ImageNet上预训练的VGG-19构建可学习特征提取器,并在模型训练期间不断更新该特征提取器的参数.这种设计可实现LDR图像的联合特征学习,为CAFA中的上下文一致性评估奠定了坚实基础.接着,应用所提出的CAFA模块,通过在图像特征中采样具有相同上下文的信息进行特征融合.最后,本文提出使用一种多尺度残差补全模块来处理融合后的特征,利用不同扩张率进行特征学习,以实现更强大的特征表示并在图像缺失区域中进行可信细节填充.同时,设计一个软注意力模块来学习不同图像区域的重要性,以便在跳跃连接期间获得与参考图像互补的所需特征.多种实验验证了CAHDRNet的有效性并证实其优于现有最先进的方法.具体而言,本文所提出的CAHDRNet在Kalantari数据集上HDR-VDP-2和PSNR-L等指标相较于次好方法AHDRNet分别提升了1.61和0.68.

关键词：高动态范围成像图像融合特征融合上下文一致性卷积采样

Rapid chemical recycling of waste polyester plastics catalyzed by recyclable catalyst

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Green Chemical Engineering 2024年第2期5卷 257-265页

作者： Yu-Ji Luo jia-yin Sun Zhi li School of Physical Science and Technology ShanghaiTech UniversityShanghai201210China

Waste plastics are serious environmental threats due to their low degradability and low recycling *** and efficient waste plastics recycling technologies are urgently demanded for a sustainable ***,we report a rapid,closed-loop,and streamlined process to convert polyesters such as poly(ethylene terephthalate)(PET)back to its purified *** trifluoromethanesulfonic acid or metal triflates as the recyclable catalyst,polyesters such as PET can be completely depolymerized by simple carboxylic acids within 1 *** coupling this acidolysis with a subsequent hydrogenolysis process,the consumed carboxylic acid was recovered and the closed-loop of PET depolymerization could be *** catalysts and depolymerization agents are fully recycled while only PET and hydrogen are consumed.

关键词： Chemical recycling Waste polyester plastics Acidolysis Recyclable catalyst

SEI/dead li-turning capacity loss for high-performance anode-free solid-state lithium batteries

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Journal of Energy Chemistry 2024年第9期96卷 145-152页

作者： Qianwen yin Tianyu li Hongzhang Zhang Guiming Zhong Xiaofei Yang Xianfeng li Division of Energy Storage Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Long-Duration and Large-Scale Energy Storage Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Laboratory of Advanced Spectro-Electrochemistry and lithium-Ion Batteries Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Anode-free solid-state lithium metal batteries(AF-SSLBs)have the potential to deliver higher energy density and improved safety beyond lithium-metal ***,the unclear mechanism for the fast capacity decay in AF-SSLBs,either determined by dead li or solid electrolyte interface(SEI),limits the proposal of effective strategies to prolong cycling *** clarify the underlying mechanism,herein,the evolution of SEI and dead li is quantitatively analyzed by a solid-state nuclear magnetic resonance(ss-NMR)technology in a typical liPF6-based polymer *** results show that the initial capacity loss is attributed to the formation of SEI,while the dead li dominates the following capacity loss and the growth rate is 0.141 mA h cm^(−2)cycle−*** reduce the active li loss,the combination of inorganic-rich SEI and self-healing electrostatic shield effect is proposed to improve the reversibility of li deposition/dissolution behavior,which reduces the capacity loss rate for the initial SEI and following dead li generation by 2.3 and 20.1 folds,*** a result,the initial Coulombic efficiency(ICE)and stable CE increase by 15.1%and 15.3%in li-Cu cells,which guides the rational design of high-performance AF-SSLBs.

关键词： Solid-state lithium batteries Solid-state NMR Anode-free SEI Dead li

Fibroblast growth factor 7 is a nociceptive modulator secreted via large dense-core vesicles

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分子细胞生物学报:英文版 2015年第5期7卷 466-475页

作者： Hui liu Qing-Feng Wu jia-yin li Xing-Jun liu Kai-Cheng li Yan-Qing Zhong Dan Wu Qiong Wang yin-Jing Lu Lan Bao Xu Zhang Institute of Neuroscience and State Key Laboratory of Neuroscience CAS Center for Excellence in Brain ScienceShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China State Key Laboratory of Cell Biology Institute of Biochemistry and Cell BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China School of life Science and Technology ShanghaiTech UniversityShanghai 201210China

Fibroblast growth factor(FGF)7,a member of FGF family,is initially found to be secreted from mesenchymal cells to repair epithelial ***,its functions in the nervous system are largely *** present study showed that FGF7 was a neuromodulator localized in the large dense-core vesicles(LDCVs)in nociceptive ***7 was mainly expressed in small-diameter neurons of the dorsal root ganglion and could be transported to the dorsal spinal ***,FGF7 was mostly stored in LDCVs that did not contain neuropeptide substance *** recordings in the spinal cord slice showed that buffer-applied FGF7 increased the amplitude of excitatory post-synaptic current evoked by stimulating the sensory afferent *** tests showed that intrathecally applied FGF7 potentiated the formalin-induced acute nociceptive ***,both acute and inflammatory nociceptive responses were significantly reduced in Fgf7-deficient *** results suggest that FGF7 exerts an excitatory modulation of nociceptive afferent transmission.

关键词： fibroblast growth factor 7 dorsal root ganglion large dense-core vesicle nociceptive modulator inflammatory pain

Reconstruction of Gold Surface with Excessive Sulfur Source During Transition Metal Disulfide Growth

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Precision Chemistry 2024年第8期2卷 414-420页

作者： Yuling yin jia li Feng Ding Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced TechnologyShenzhen 518055People’s Republic of China

The inert gold substrate is one of the most commonly used substrates for synthesizing transition metal dichalcogenides(TMDCs),while the growth mechanism of TMDCs on gold substrates in a sulfur-rich environment is still *** on density functional theory calculations,we explored the reconstruction of the gold surface in a sulfur-rich environment,which is one of the conditions for the growth of *** clearly revealed that both Au(100)and Au(111)surfaces tend to form metal sulfide buffer layers between TMDCs and the metallic substrate,which are the square pattern of Au4S4 on Au(100)surface and the hexagonal pattern of Au6S6 on Au(111)surface,*** the sulfur-rich environment,both square and hexagonal patterns are energetically highly stable,greatly weakening the interaction between TMDCs and the ***,both buffer layers inherit the symmetry of the substrate and thus have no significant effect on the growth behavior of *** study explains many experimental puzzles and elucidates the growth behavior of 2D materials on various substrates.

关键词： MoS2 Au-S reconstruction Au substrate growth mechanism alignment

Intelligent Power Grid Load Transferring Based on Safe Action-Correction Reinforcement Learning

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Energy Engineering 2024年第6期121卷 1697-1711页

作者： Fuju Zhou li li Tengfei jia Yongchang yin Aixiang Shi Shengrong Xu Suqian Power Supply Branch State Grid Jiangsu Electric Power Co.Ltd.Suqian223800China

When a line failure occurs in a power grid, a load transfer is implemented to reconfigure the network by changingthe states of tie-switches and load demands. Computation speed is one of the major performance indicators inpower grid load transfer, as a fast load transfer model can greatly reduce the economic loss of post-fault powergrids. In this study, a reinforcement learning method is developed based on a deep deterministic policy *** tedious training process of the reinforcement learning model can be conducted offline, so the model showssatisfactory performance in real-time operation, indicating that it is suitable for fast load transfer. Consideringthat the reinforcement learning model performs poorly in satisfying safety constraints, a safe action-correctionframework is proposed to modify the learning model. In the framework, the action of load shedding is correctedaccording to sensitivity analysis results under a small discrete increment so as to match the constraints of line flowlimits. The results of case studies indicate that the proposed method is practical for fast and safe power grid loadtransfer.

关键词： Load transfer reinforcement learning electrical power grid safety constraints

Microbiome-friendly PS/PVP electrospun fibrous membrane with antibiofilm properties for dental engineering

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Regenerative Biomaterials 2024年第4期3卷 27-37页

作者： jiamin Chen jia Guo Xueyun Lu Derong yin Cuisong Zhou Yuqing li Xuedong Zhou State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesDepartment of Operative Dentistry and EndodonticsWest China Hospital of StomatologySichuan UniversityChengduSichuan610041China Stomatological Hospital affiliated Suzhou Vocational Health College Department of Operative Dentistry and EndodonticsSuzhou215000China College of Chemistry Sichuan UniversityChengduSichuan610064China

Dental caries is one of the most prevalent and biofilm-associated oral diseases in *** mutans,with a high ability to form biofilms by adhering to hard surfaces,has been established as an important etiological agent for dental ***,it is crucial to find a way to prevent the formation of cariogenic ***,we report an electrospun fibrous membrane that could inhibit the adhesion and biofilm formation of ***,the polystyrene(PS)/polyvinyl pyrrolidone(PVP)electrospun fibrous membrane altered the 3D biofilm architecture and decreased water-insoluble extracellular polysaccharide ***,the anti-adhesion mechanism which laid in Coulomb repulsion between the negatively charged PS/PVP electrospun fibrous membrane and *** was detected by zeta ***,metagenomics sequencing analysis and CCK-8 assay indicated that PS/PVP electrospun fibrous membrane was microbiome-friendly and displayed no influence on the cell viability of human gingival epithelial cells and human oral ***,an in vitro simulation experiment demonstrated that PS/PVP electrospun fibrous membrane could decrease colony-forming unit counts of *** effectively,and PS/PVP electrospun fibrous membrane carrying calcium fluoride displayed better anti-adhesion ability than that of PS/PVP electrospun fibrous membrane ***,this research showed that the PS/PVP electrospun fibrous membrane has potential applications in controlling and preventing dental caries.

关键词： Streptococcus mutans PS/PVP electrospun fibrous membrane biofilm(s) anti-adhesion Coulomb repulsion

Photo-promoted rapid reconstruction induced alterations in active site of Ag@amorphous NiFe hydroxides for enhanced oxygen evolution reaction

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Carbon Energy 2024年第9期6卷 210-220页

作者： Zhi Cai Mingyuan Xu Yanhong li Xinyan Zhou Kexin yin lidong li Binbin jia lin Guo Hewei Zhao School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijingChina School of Physics Beihang UniversityBeijingChina Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichangHubeiChina

The dynamic surface self-reconstruction behavior in local structure correlates with oxygen evolution reaction(OER)performance,which has become an effective strategy for constructing the catalytic active ***,it remains a challenge to understand the mechanisms of reconstruction and to accomplish it fast and ***,we reported a photo-promoted rapid reconstruction(PRR)process on Ag nanoparticle-loaded amorphous Ni-Fe hydroxide nanosheets on carbon cloth for enhanced *** photogenerated holes generated by Ag in conjunction with the anodic potential contributed to a thorough reconstruction of the amorphous *** valence state of unsaturated coordinated Fe atoms,which serve as active sites,is significantly increased,while the corresponding crystalline substrate shows little *** different structural evolutions of amorphous and crystalline substrates during reconstruction lead to diverse pathways of *** PRR utilizing loaded noble metal nanoparticles can accelerate the generation of active species in the substrate and increase the electrical conductivity,which provides a new inspiration to develop efficient catalysts via reconstruction strategies.

关键词： Ag amorphous Ni-Fe hydroxide OER photo-promoted rapid reconstruction

Comparative Experimental Study on Heat Transfer Characteristics of Building Exterior Surface at High and Low Altitudes

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Journal of Thermal Science 2024年第3期33卷 1119-1131页

作者： jia Yonghong GUO Shurui li Jin GUO Lei CHENG Zhu ZHANG yin YANG Hanyu LONG Enshen Institute for Disaster Management and Reconstruction Sichuan UniversityChengdu610065China MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China

The external surface heat transfer coefficient of building envelope is one of the important parameters necessary for building energy saving design,but the basic data in high-altitude area are ***,the authors propose a modified measurement method based on the heat balance of a model building,and use the same model building to measure its external surface heat transfer coefficient under outdoor conditions in Chengdu city,China at an altitude of 520 m and Daocheng city at an altitude of 3750 m *** results show that the total heat transfer coefficient(h_(t))of building surface in high-altitude area is reduced by 34.48%.The influence of outdoor wind speed on the convective heat transfer coefficient(h_(c))in high-altitude area is not as significant as that in low-altitude *** fitting relation between convection heat transfer coefficient and outdoor wind speed is also *** the same heating power,the average temperature rise of indoor and outdoor air at highaltitude is 41.9%higher than that at low altitude,and the average temperature rise of inner wall is 25.8%higher than that at low *** shows that high-altitude area can create a more comfortable indoor thermal environment than low-altitude area under the same energy consumption *** is not appropriate to use the heat transfer characteristics of the exterior surface of buildings in low-altitude area for building energy saving design and related heating equipment selection and system terminal matching design in high-altitude area.

关键词： altitude heat transfer characteristics convective heat transfer coefficient(h_(c)) radiative heat transfer coefficient(h_(r)) external building envelope