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MTTSNet:Military time-sensitive targets stealth network via real-time mask generation
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作者 Siyu Wang xiaogang yang +4 位作者 Ruitao Lu Zhengjie Zhu Fangjia Lian Qing-ge Li Jiwei Fan 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第3期601-612,共12页
The automatic stealth task of military time-sensitive targets plays a crucial role in maintaining national military security and mastering battlefield dynamics in military applications.We propose a novel Military Time... The automatic stealth task of military time-sensitive targets plays a crucial role in maintaining national military security and mastering battlefield dynamics in military applications.We propose a novel Military Time-sensitive Targets Stealth Network via Real-time Mask Generation(MTTSNet).According to our knowledge,this is the first technology to automatically remove military targets in real-time from videos.The critical steps of MTTSNet are as follows:First,we designed a real-time mask generation network based on the encoder-decoder framework,combined with the domain expansion structure,to effectively extract mask images.Specifically,the ASPP structure in the encoder could achieve advanced semantic feature fusion.The decoder stacked high-dimensional information with low-dimensional information to obtain an effective mask layer.Subsequently,the domain expansion module guided the adaptive expansion of mask images.Second,a context adversarial generation network based on gated convolution was constructed to achieve background restoration of mask positions in the original image.In addition,our method worked in an end-to-end manner.A particular semantic segmentation dataset for military time-sensitive targets has been constructed,called the Military Time-sensitive Target Masking Dataset(MTMD).The MTMD dataset experiment successfully demonstrated that this method could create a mask that completely occludes the target and that the target could be hidden in real time using this mask.We demonstrated the concealment performance of our proposed method by comparing it to a number of well-known and highly optimized baselines. 展开更多
关键词 Deep learning Military application Targets stealth network Mask generation Generative adversarial network
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石墨烯/酒石酸掺杂态聚苯胺的制备及防腐性能 被引量:4
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作者 王传洁 杨小刚 +1 位作者 李斌 陈浩岩 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2019年第6期143-148,156,共7页
在酒石酸体系下,采用原位聚合法合成还原氧化石墨烯(RGO)/一次掺杂态聚苯胺(PANI)纳米复合材料,经氨水解掺杂后,再对其进行二次掺杂得到RGO/二次掺杂态PANI纳米复合材料。利用傅里叶变换红外光谱、紫外光谱和扫描电子显微镜测试技术,分... 在酒石酸体系下,采用原位聚合法合成还原氧化石墨烯(RGO)/一次掺杂态聚苯胺(PANI)纳米复合材料,经氨水解掺杂后,再对其进行二次掺杂得到RGO/二次掺杂态PANI纳米复合材料。利用傅里叶变换红外光谱、紫外光谱和扫描电子显微镜测试技术,分析了不同配比RGO/PANI纳米复合材料的官能团及表面形态特征。并通过电化学测试技术研究了RGO/PANI薄膜在模拟海水体系中的防腐性能。结果表明,还原氧化石墨烯与苯胺质量比为1∶15时产物形貌及防腐效果最佳,其中,RGO/一次掺杂态PANI的缓蚀效率可达70.2%;RGO/二次掺杂态PANI防腐性能更优,缓蚀率高达75.6%。 展开更多
关键词 还原氧化石墨烯 聚苯胺 酒石酸 二次掺杂 防腐
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Enhanced production of glycyrrhetic acid 3-O-mono-β-D-glucuronide by fed-batch fermentation using p H and dissolved oxygen as feedback parameters 被引量:2
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作者 Bo Lu xiaogang yang +1 位作者 Xudong Feng Chun Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第4期506-512,共7页
Glycyrrhetic acid 3-O-mono-β-D-glucuronide (GAMG), the major functional ingredient in licorice, has widespread applications in food, pharmacy and cosmetics industry. The production of GAMG through Penicillium purpu... Glycyrrhetic acid 3-O-mono-β-D-glucuronide (GAMG), the major functional ingredient in licorice, has widespread applications in food, pharmacy and cosmetics industry. The production of GAMG through Penicillium purpurogenum Li-3 cultivation was for the first time performed through both batch and fed-batch processes in bioreactors. In batch process, under optimal conditions (pH 5.0, temperature 32℃, agitation speed 100 r. rain 1), 3.55 g. L^-1 GAMG was obtained in a 2.5 L fermentor. To further enhance GAMG production, a fine fed-batch process was developed by using pH and DO as feedback parameters. Starting from 48 h, 100 m190 g-L 1 substrate Glycyrrhizin (GL) was fed each time when pH increased to above 5.0 and DO was increased to above 80%. This strategy can significantly enhance GAMG production: the achieved GL conversion was 95.34% with GAMG yield of 95.15%, and GAMG concentration was 16.62 g. L^-1 which was 5 times higher than that of batch. Then, a two-step separation strat- egy was established to separate GAMG from fermentation broth by crude extraction of 15 ml column packed with D10I resin followed by fine purification with preparative C18 chromatography. The obtained GAMG purity was 95.79%. This study provides a new insight into the industrial bioprocess of high-level GAMG production. 展开更多
关键词 Glycyrrhetic acid 3-O-mono-β -D-glucuronideFed-batch fermentationPenicillium purpurogenum Li-3D1 O1 resin separation
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Synergetic bimetallic catalysts:A remarkable platform for efficient conversion of CO_(2) to high value-added chemicals 被引量:1
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作者 Jundie Hu Fengyi yang +3 位作者 Jiafu Qu Yahui Cai xiaogang yang Chang Ming Li 《Journal of Energy Chemistry》 SCIE EI CSCD 2023年第12期162-191,I0006,共31页
Carbon dioxide reduction reaction(CO_(2)RR) represents an efficient approach to achieving carbon neutrality and simultaneously generating clean energy.However,the strong stability of CO_(2) molecules and the diversity... Carbon dioxide reduction reaction(CO_(2)RR) represents an efficient approach to achieving carbon neutrality and simultaneously generating clean energy.However,the strong stability of CO_(2) molecules and the diversity of products pose significant challenges.As an emerging material,bimetallic catalysts have been widely reported for their unique advantages,such as tunable electronic structures,suitable adsorption/desorption of CO_(2) and intermediates,and optimizable d-band centers of active sites through bimetallic synergy.These catalysts provide a remarkable platform for converting CO_(2) into high value-added chemicals.This review comprehensively summarizes recent research advances in bimetallic catalysts for CO_(2)RR.Firstly,the challenges associated with CO_(2)RR,including activity and selectivity are analyzed,followed by a discussion on the unique advantages of bimetallic catalysts.Next,their synthesis strategies are categorized into dual-atom site catalysts(DACs),bimetallic nanoparticles and nanoclusters,binary metal semiconductors,and layered double hydroxides(LDHs).Additionally,advanced characterization techniques of bimetallic catalysts and their applications in CO_(2)RR are thoroughly introduced.Finally,the prospects and challenges for the application of bimetallic materials are highlighted.This review aims to provide inspiration for CO_(2)RR into high-value chemicals and shed light on the research of bimetallic materials. 展开更多
关键词 CATALYSIS Carbon dioxide BIMETALLIC Dual-atom site catalysts SYNERGY
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Multi-Modal Scene Matching Location Algorithm Based on M2Det
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作者 Jiwei Fan xiaogang yang +2 位作者 Ruitao Lu Qingge Li Siyu Wang 《Computers, Materials & Continua》 SCIE EI 2023年第10期1031-1052,共22页
In recent years,many visual positioning algorithms have been proposed based on computer vision and they have achieved good results.However,these algorithms have a single function,cannot perceive the environment,and ha... In recent years,many visual positioning algorithms have been proposed based on computer vision and they have achieved good results.However,these algorithms have a single function,cannot perceive the environment,and have poor versatility,and there is a certain mismatch phenomenon,which affects the positioning accuracy.Therefore,this paper proposes a location algorithm that combines a target recognition algorithm with a depth feature matching algorithm to solve the problem of unmanned aerial vehicle(UAV)environment perception and multi-modal image-matching fusion location.This algorithm was based on the single-shot object detector based on multi-level feature pyramid network(M2Det)algorithm and replaced the original visual geometry group(VGG)feature extraction network with the ResNet-101 network to improve the feature extraction capability of the network model.By introducing a depth feature matching algorithm,the algorithm shares neural network weights and realizes the design of UAV target recognition and a multi-modal image-matching fusion positioning algorithm.When the reference image and the real-time image were mismatched,the dynamic adaptive proportional constraint and the random sample consensus consistency algorithm(DAPC-RANSAC)were used to optimize the matching results to improve the correct matching efficiency of the target.Using the multi-modal registration data set,the proposed algorithm was compared and analyzed to verify its superiority and feasibility.The results show that the algorithm proposed in this paper can effectively deal with the matching between multi-modal images(visible image–infrared image,infrared image–satellite image,visible image–satellite image),and the contrast,scale,brightness,ambiguity deformation,and other changes had good stability and robustness.Finally,the effectiveness and practicability of the algorithm proposed in this paper were verified in an aerial test scene of an S1000 sixrotor UAV. 展开更多
关键词 Visual positioning multi-modal scene matching unmanned aerial vehicle
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Metal-organic-frameworks passivated CuBi_(2)O_(4)photocathodes boost CO_(2)reduction kinetics
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作者 Jiaqi Jin Guangming Cao +4 位作者 Yanjie Liu Yingying Shu Zhiyuan Deng Wei Sun xiaogang yang 《Materials Reports(Energy)》 EI 2023年第4期60-70,共11页
Photoelectrochemical reduction of CO_(2)to produce CO with metal-organic frameworks(MOFs)is recognized as a desirable technology to mitigate CO_(2)emission and generate sustainable energy.To achieve highly efficient e... Photoelectrochemical reduction of CO_(2)to produce CO with metal-organic frameworks(MOFs)is recognized as a desirable technology to mitigate CO_(2)emission and generate sustainable energy.To achieve highly efficient electrocatalyst,it is essential to design a new material interface and uncover new reaction mechanisms or kinetics.Herein,we developed two metal-organic Cu-MOF and Bi-MOF layers using benzene tricarboxylic acid(H_(3)BTC)ligands on CuBi_(2)O_(4) photocathodes.Both MOF layers drastically improved the photoelectrochemical stability by suppressing the photo-corrosion through conformal surface passivation.The Cu-MOF modified CuBi_(2)O_(4) showed more significant charge separation and transfer efficiencies than the Bi-MOF modified control.Based on the transient photocurrent curves under the applied potential of 0.6 V vs.RHE,the rate-law analysis showed the CO_(2)photoreduction took place through a first-order reaction.Further,the photoelectrochemical impedance spectra(PEIS)revealed this reaction order,representing an“operando”analysis.Moreover,the reaction rate constant on Cu-MOF modified sample was higher than that on Bi-MOF modified one and bare CuBi_(2)O_(4).Combined with the density functional theory calculation,the surface absorption of CO_(2)and CO molecules and the higher energy barrier for*COOH intermediates could significantly determine the first order reaction. 展开更多
关键词 Copper bismuth oxide Carbon dioxide photoelectrochemical reduction Metal-organic framework Rate-law kinetics
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Survey on an Old "Glistening Technology" on Gold and Silver Gilt in Chinese Three Gorges Region during Han Dynasty
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作者 xiaogang yang Birui Xiao +1 位作者 Houxi Zou Pujun Jin 《Journal of Earth Science and Engineering》 2014年第7期438-444,共7页
Three copper wares of Han Dynasty, decorated with golden and silvery pattems in Chongqing Municipal, Three Gorges Region, were analyzed by SEM (scanning electron microscope) and EDAX (energy dispersive X-ray analy... Three copper wares of Han Dynasty, decorated with golden and silvery pattems in Chongqing Municipal, Three Gorges Region, were analyzed by SEM (scanning electron microscope) and EDAX (energy dispersive X-ray analysis). The results reveal that mercury was used to melt gold or silver to form amalgam as late as Chinese Han Dynasty. Ancient craftsmen sheared gold foils to attain tiny gold trips that make them easy to melt into liquid mercury. After gilded, artefacts were well polished to show the brilliance of gold. As an important discovery, the silver amalgam was also detected on one copper ware. It is worth noting that silver was mixed with gold in liquid mercury to form silver amalgam which is apt to form amalgam and make silver amalgam layer stick to bronze surface tightly. This successful technology is derived from a prolonged accumulation of Chinese craftsmen on mining and metallurgical handicraft, 展开更多
关键词 Gilding bronze gold mercury silver mercury amalgam.
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Robust Performance of Scene Matching Algorithm
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作者 Zhaohui Xia xiaogang yang +1 位作者 Fei Meng Shicheng Wang 《Journal of Software Engineering and Applications》 2013年第5期6-10,共5页
Performance analysis is very important in the study and design of scene matching algorithm. Based on the analysis of the common performance parameters, robustness of scene matching algorithm is defined, including the ... Performance analysis is very important in the study and design of scene matching algorithm. Based on the analysis of the common performance parameters, robustness of scene matching algorithm is defined, including the definitions of robust stability and robust performance, and the corresponding evaluation parameters matching margin and matching adaptability are given. With application of these robustness parameters on 8 scene matching algorithms, quantitative analysis results of algorithm robustness are obtained. The paper provides an important theoretical reference to the performance evaluation of scene matching algorithm. 展开更多
关键词 SCENE MATCHING MATCHING ALGORITHM PERFORMANCE PARAMETERS ROBUSTNESS PERFORMANCE Evaluation
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Dual-channel redox reactions for photocatalytic H_(2)-evolution coupled with photoreforming oxidation of waste materials
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作者 Huan Liu Shaoxiong He +4 位作者 Jiafu Qu Yahui Cai xiaogang yang Chang Ming Li Jundie Hu 《Chinese Journal of Catalysis》 SCIE CAS 2024年第10期1-39,共39页
Dual-channel redox reaction system is advantageous for photocatalytic hydrogen(H_(2))production when coupled with photoreforming oxidation of waste materials,benefiting both thermodynamically and kinetically.However,e... Dual-channel redox reaction system is advantageous for photocatalytic hydrogen(H_(2))production when coupled with photoreforming oxidation of waste materials,benefiting both thermodynamically and kinetically.However,existing reviews primarily focus on specific oxidation reactions,such as oxidative organic synthesis and water remediation,often neglecting recent advancements in plastic upgrading,biomass conversion,and H_(2)O_(2)production,and failing to provide an in-depth discussion of catalytic mechanisms.This review addresses these gaps by offering a comprehensive overview of recent advancements in dual-channel redox reactions for photocatalytic H_(2)-evolution and waste photoreforming.It highlights waste-to-wealth design concepts,examines the challenges,advantages and diverse applications of dual-channel photocatalytic reactions,including photoreforming of biomass,alcohol,amine,plastic waste,organic pollutants,and H_(2)O_(2)production.Emphasizing improvement strategies and exploration of catalytic mechanisms,it includes advanced in-situ characterization,spin capture experiments,and DFT calculations.By identifying challenges and future directions in this field,this review provides valuable insights for designing innovative dual-channel photocatalytic systems. 展开更多
关键词 Photocatalysis Dual-channel Hydrogen evolution Photoreforming oxidation In situ characterization
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Enabling practical electrocatalyst-assisted photoelectro- chemical water splitting with earth abundant materials 被引量:12
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作者 xiaogang yang Rui Liu +3 位作者 Yumin He James Thorne Zhi Zheng Dunwei Wang 《Nano Research》 SCIE EI CAS CSCD 2015年第1期56-81,共26页
Sustainable development and continued prosperity of humanity hinge on the availability of renewable energy sources on a terawatts scale. In the long run, solar energy is the only source that can meet this daunting dem... Sustainable development and continued prosperity of humanity hinge on the availability of renewable energy sources on a terawatts scale. In the long run, solar energy is the only source that can meet this daunting demand. Widespread utilization of solar energy faces challenges as a result of its diffusive (hence low energy density) and intermittent nature. How to effectively harvest, concentrate, store and redistribute solar energy constitutes a fundamental challenge that the scientific community needs to address. Photoelectrochemical (PEC) water splitting is a process that can directly convert solar energy into chemical energy and store it in chemical bonds, by producing hydrogen as a clean fuel source. It has received significant research attention lately. Here we provide a concise review of the key issues encountered in carrying out PEC water splitting. Our focus is on the balance of considerations such as stability, earth abundance, and efficiency. Particular attention is paid to the combination of photoelectrodes with electrocatalysts, especially on the interfaces between different components. 展开更多
关键词 photoelectrochemical water splitting efficiency stability interface earth abundance
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Mechanisms of water oxidation on heterogeneous catalyst surfaces 被引量:3
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作者 xiaogang yang Yuanxing Wang +1 位作者 Chang Ming Li Dunwei Wang 《Nano Research》 SCIE EI CSCD 2021年第10期3446-3457,共12页
Water oxidation,an essential step in photosynthesis,has attracted intense research attention.Understanding the reaction pathways at the electrocatalyst/water interface is of great importance for the development of wat... Water oxidation,an essential step in photosynthesis,has attracted intense research attention.Understanding the reaction pathways at the electrocatalyst/water interface is of great importance for the development of water oxidation catalysts.How the water is oxidized on the electrocatalyst surface by the positive charges is still an open question.This review summarizes current advances in studies on surface chemistry within the context of water oxidation,including the intermediates,reaction mechanisms,and their influences on the reaction kinetics.The Tafel analyses of some electrocatalysts and the rate-laws relative to charge consumption rates are also presented.Moreover,how the multiple charge transfer relies on the intermediate coverage and the accumulated charge numbers is outlined.Lastly,the intermediates and rate-determining steps on some water oxidation catalysts are discussed based on density functional theories. 展开更多
关键词 water oxidation INTERMEDIATE rate-determining step rate-law Tafel analysis density functional theory
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Advances in metal-organic frameworks for efficient separation and purification of natural gas 被引量:4
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作者 Haiming yang Linhao Xue +2 位作者 xiaogang yang Hui Xu Junkuo Gao 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2023年第2期57-68,共12页
Natural gas is an essential chemical raw material and a promising clean energy source,which is widely used and increasingly in demand.Gas separation processes significantly impact the current needs of human society.Th... Natural gas is an essential chemical raw material and a promising clean energy source,which is widely used and increasingly in demand.Gas separation processes significantly impact the current needs of human society.The traditional low temperature liquefaction distillation method of natural gas has high cost of gas separation and purification,which limits its wide application.As a new kind of porous materials,metal-organic frameworks(MOFs)have shown excellent gas separation and purification prospects due to their ultra-high specific surface area,easily modified pore surface,structural design,and functionalization.Here,we summarize the recent research progress of using MOFs adsorbent for the separation of natural gas,including C_(3)H_(8)/CH_(4),C_(2)H_(6)/CH_(4),H_(2)S/CH_(4),CO_(2)/CH_(4),and CH_(4)/N_(2).Furthermore,bottlenecks and possible research directions for further exploration are discussed. 展开更多
关键词 Metal-organic frameworks ADSORPTION SEPARATION Natural gas
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An in-situ room temperature route to CuBiI_4 based bulk-heterojunction perovskite-like solar cells 被引量:2
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作者 Busheng Zhang Yan Lei +4 位作者 Ruijuan Qi Haili Yu xiaogang yang Tuo Cai Zhi Zheng 《Science China Materials》 SCIE EI CSCD 2019年第4期519-526,共8页
Both bismuth and copper are non-toxic and earth-abundant elements suitable for lead-free halide perovskite-like photovoltaic devices. Here, we report a highly facile route for in-situ producing copper-bismuth-iodide(C... Both bismuth and copper are non-toxic and earth-abundant elements suitable for lead-free halide perovskite-like photovoltaic devices. Here, we report a highly facile route for in-situ producing copper-bismuth-iodide(CuBiI4) thin films directly on ITO substrate at room temperature, by utilizing a Bi-Cu alloy layer as precursor. X-ray diffraction and transmission electron microscopy(TEM) results verified the formation of well crystallized CuBiI4 thin films with [222] orientation. The transient photovoltage(TPV) analysis revealed that the CuBiI4 is an n-type semiconductor with a suitable band gap of ~1.81 eV, preferable to photoelectric conversion compared with CH3NH3PbI3. It is very interesting that the subsequent spin-coating process of the classical Spiro-MeOTAD organic solution with TBP and acetonitrile resulted in a dense and smooth CuBiI4:SpiroMeOTAD bulk-heterojunction film. The preliminarily fabricated simple sandwich structures of ITO/CuBiI4:Spiro-MeOTAD/Au hybrid solar cell devices displayed efficient photovoltaic performance with the PCE up to 1.119% of the best sample. The room temperature direct metal surface elemental reaction(DMSER) method may provide a new insight for all-inorganic lead free perovskite-like AaBbXx compounds and high performance photovoltaic devices. 展开更多
关键词 copper-bismuth-iodide CuBiI4 room temperature LEAD-FREE perovskite-like BULK-HETEROJUNCTION solar cells
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Growth,serum biochemical parameters,salinity tolerance and antioxidant enzyme activity of rainbow trout(Oncorhynchus mykiss)in response to dietary taurine levels 被引量:2
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作者 Ming Huang xiaogang yang +5 位作者 yangen Zhou Jian Ge DAllen Davis Yunwei Dong Qinfeng Gao Shuanglin Dong 《Marine Life Science & Technology》 2021年第4期449-462,共14页
This study evaluated the effect of dietary taurine levels on growth,serum biochemical parameters,salinity adaptability,and antioxidant activity of rainbow trout(Oncorhynchus mykiss).Four diets were formulated with tau... This study evaluated the effect of dietary taurine levels on growth,serum biochemical parameters,salinity adaptability,and antioxidant activity of rainbow trout(Oncorhynchus mykiss).Four diets were formulated with taurine supplements at 0,0.5,1,and 2%w/v(abbreviated as To,T05,Tt,and T2,respectively).Rainbow trouts(initial weight of 80.09±4.72 g)were stocked in tanks(180 L capacity),and were fed these diets for six weeks and subsequently underwent salinity acclimation.Physiological indicators were determined before salinity acclimation at 1,4,7,and 14 days afterwards.Results showed that there were no significant differences in growth performance(final mean weight ranged from 182.35 g to 198.48 g;percent weight gain was between 127.68%and 147.92%)of rainbow trout in freshwater stage,but dietary taurine supplement significantly increased serum-free taurine content.After entering seawater,the Na+-K+-ATPase activity of T2 group returned to its freshwater levels,and the serum cortisol content was significantly higher than To and To 5 groups.At the end of this experiment,the liver superoxide dismutase activity in the To and To 5 groups was significantly lower than in the Tj and T2 groups,and the liver catalase in the To group was the lowest whereas that in the T2 group was the highest.Muscle malondialdehyde content was the highest in the To group,and the lowest in the T2 group.Based on the results of this study,supplement of dietary taurine(0.5-2%)enhanced the salinity tolerance in rainbow trout,which increased with the higher taurine concentration. 展开更多
关键词 Antioxidant status Health status Rainbow trout Salinity adaptation TAURINE
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Low temperature fabrication for high-performance semitransparent CsPbI_(2)Br perovskite solar cells
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作者 xiaogang yang Jiejia Han +5 位作者 Wei Ruan Yanqiang Hu Zhengyan He Xiangrui Jia Shufang Zhang Dehua Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2022年第3期1425-1429,共5页
All-inorganic CsPbI_(2)Br perovskite with suitable bandgap and excellent thermal stability has been reported as the most promising candidate for efficient perovskite solar cells (PSCs). However, the high annealing tem... All-inorganic CsPbI_(2)Br perovskite with suitable bandgap and excellent thermal stability has been reported as the most promising candidate for efficient perovskite solar cells (PSCs). However, the high annealing temperature (> 250 ℃) and poor stability of α-CsPbI_(2)Br greatly limit the future application in photovoltaic field. Herein, a facile method is reported to prepare α-CsPbI_(2)Br perovskite film with high stability at low temperature (70 ℃) by incorporating a small amount of γ-aminobutyric acid (GABA) in the precursor solutions. The devices exhibit reproducible photovoltaic performance with a champion efficiency up to 15.16%, along with the excellent stability, maintaining more than 80% of its initial efficiency after stored in ambient condition for 600 h without any encapsulation. Most importantly, the method enables fabrication of semitransparent CsPbI_(2)Br PSCs with a PCE of 6.76%, as well as an average visible transparency (AVT) of 25.38%. To the best of our knowledge, this is the first attempt to apply CsPbI_(2)Br to the semitransparent solar cells. 展开更多
关键词 CsPbI_(2)Br perovskite γ-Aminobutyric acid Stability Low-temperature fabrication Semitransparent solar cells
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