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Direct synthesis of moirésuperlattice through chemical vapor deposition growth of monolayer WS_(2)on plasma-treated HOPG

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Nano Research 2022年第9期15卷 8587-8594页

作者： Xiaowen Zhou zongnan zhang Xinlong Zeng Yaping Wu Feiya Xu Chunmiao zhang Xu Li Zhiming Wu Junyong Kang Department of Physics Engineering Research Center for Micro-Nano Optoelectronic Materials and Devices at Education MinistryOSEDFujian Provincial Key Laboratory of Semiconductor Materials and ApplicationsXiamen UniversityXiamen 361005China

Vertical van der Waals(vdW)heterostructures composed of two-dimensional(2D)layered materials have recently attracted substantial interests due to their unique ***,the direct synthesis of moirésuperlattice remains a great challenge due to the difficulties in heterogeneous nucleation on smooth vdW ***,we report a controllable chemical vapor deposition growth of complete monolayer WS_(2)on highly ordered pyrolytic graphite(HOPG)substrates through the plasma *** results show that the morphologies of the grown WS_(2)have a strong dependence on the plasma parameters,including gas composition,source power,and treatment *** is found that the surface C–C bonds are broken in the plasma pretreated HOPG,and the formed small clusters can act as the nucleation sites for the subsequent growth of WS_(2).Moreover,the height of clusters dominates the growth mode of WS_(2)islands.A transition from a 2D mode to three-dimensional(3D)growth mode occurs when the height is higher than the interlayer spacing of the ***,diverse moirésuperlattices with different twist angles for WS_(2)/HOPG heterostructures are observed,and the formation mechanism is further analyzed by firstprinciples calculations.

关键词： chemical vapor deposition plasma pretreatment van der Waals(vdW)heterostructures moirésuperlattice

Photoinduced FeCl_(3)-Catalyzed Alkyl Aromatics Oxidation toward Degradation of Polystyrene at Room Temperature

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Chinese Journal of Chemistry 2021年第12期39卷 3225-3230页

作者： Guoxiang zhang zongnan zhang Rong Zeng School of Chemistry MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Key Laboratory of Sustainable Energy Materials ChemistryXi'an Jiaotong University(XJTU)Xi'anShaanxi 710049China Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhenGuangdong 518055China

While polystyrene is widely used in daily life as a synthetic plastic,the subsequently selective degradation is still very challenging and highly ***,we disclose a highly practical and selective reaction for the catalytically efficient oxidation of alkyl aromatics(including 1°,2°,and 3°alkyl aromatics)to carboxylic *** dioxygen was used as the sole terminal oxidant,this protocol was catalyzed by the inexpensive and readily available ferric compound(FeCl_(3))with irradiation of visible light(blue LEDs)under only 1 atmosphere of O_(2) at room *** system could further facilitate the selective degradation of polystyrene to benzoic acid,providing an important and practical tool to generate high-value chemical from abundant polystyrene wastes.

关键词： Iron catalysis PS degradation Photocatalysis Oxidation Radical reactions

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俄语存在句结构-语义分析

外国语文 2021年第3期37卷 97-106页

作者：张宗男黑龙江大学俄罗斯语言文学与文化研究中心/俄语学院黑龙江哈尔滨150080

俄语存在句是一种基本而极为重要的句子类型。本文引入话题视角及与此相关的空间性、个体方位语和类方位语以及语义次范畴化等较具新意的概念和分析手段,对俄语存在句的结构、语义问题进行研究。具体分析中,一方面将对俄语存在句的基本... 详细信息

俄语存在句是一种基本而极为重要的句子类型。本文引入话题视角及与此相关的空间性、个体方位语和类方位语以及语义次范畴化等较具新意的概念和分析手段,对俄语存在句的结构、语义问题进行研究。具体分析中,一方面将对俄语存在句的基本结构、空间性结构特征以及结构-语义分类问题展开讨论,另一方面将重点对俄语动态存在句的语义次范畴化进行分析和描写,借此深入挖掘俄语存在句的结构性能和语义特征及语义次范畴表现,多维度探察俄语存在句的语义性能和语言实质。文中研究突破了传统存在句分析视角和方法的窠臼,有助于深入探索俄语存在句的功能语义关系和性质、推动存在句子结构-语义问题的细化研究。

关键词：俄语存在句空间性分类范畴动态存在句语义次范畴化结构—语义

N-doped graphene quantum dot-decorated N-TiO2/P-doped porous hollow g-C_(3)N_(4) nanotube composite photocatalysts for antibiotic photodegradation and H2 production

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 165-178页

作者： Jingshu Yuan Yao zhang Xiaoyan zhang Junjie zhang Shen’gen zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Xi’an Fanyi University Xi’an 710105China Shunde Graduate School of University of Science and Technology Beijing Foshan 528399China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao SAR 820000China

Exclusive responsiveness to ultraviolet light (~3.2 eV) and high photogenerated charge recombination rate are the two primary drawbacks of pure TiO_(2). We combined N-doped graphene quantum dots (N-GQDs), morphology regulation, and heterojunction construction strategies to synthesize N-GQD/N-doped TiO_(2)/P-doped porous hollow g-C_(3)N_(4) nanotube (PCN) composite photocatalysts (denoted as G-TPCN). The optimal sample (G-TPCN doped with 0.1wt% N-GQD, denoted as 0.1% G-TPCN) exhibits significantly enhanced photoabsorption, which is attributed to the change in bandgap caused by elemental doping (P and N), the improved light-harvesting resulting from the tube structure, and the upconversion effect of N-GQDs. In addition, the internal charge separation and transfer capability of0.1% G-TPCN are dramatically boosted, and its carrier concentration is 3.7, 2.3, and 1.9 times that of N-TiO_(2), PCN, and N-TiO_(2)/PCN(TPCN-1), respectively. This phenomenon is attributed to the formation of Z-scheme heterojunction between N-TiO_(2) and PCNs, the excellent electron conduction ability of N-GQDs, and the short transfer distance caused by the porous nanotube structure. Compared with those of N-TiO_(2), PCNs, and TPCN-1, the H2 production activity of 0.1%G-TPCN under visible light is enhanced by 12.4, 2.3, and 1.4times, respectively, and its ciprofloxacin (CIP) degradation rate is increased by 7.9, 5.7, and 2.9 times, respectively. The optimized performance benefits from excellent photoresponsiveness and improved carrier separation and migration efficiencies. Finally, the photocatalytic mechanism of 0.1% G-TPCN and five possible degradation pathways of CIP are proposed. This study clarifies the mechanism of multiple modification strategies to synergistically improve the photocatalytic performance of 0.1% G-TPCN and provides a potential strategy for rationally designing novel photocatalysts for environmental remediation and solar energy conversion.

关键词： N-doped TiO_(2) N-doped graphene quantum dots P-doped g-C_(3)N_(4) porous hollow nanotube heterojunction photocatalysis

The ALMaQUEST Survey XV: The dependence of the molecular-to-atomic gas ratios on resolved optical diagnostics

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Niankun Yu Zheng Zheng Chao-Wei Tsai Pei Zuo Sara L.Ellison David V.Stark Di Li Jingwen Wu Karen L.Masters Ting Xiao Yinghui Zheng zongnan Li Kai zhang Hongying Chen Shu Liu Sihan Jiao Fanyi Meng School of Physics Zhejiang University National Astronomical Observatories Chinese Academy of Sciences Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University School of Astronomy and Space Science University of Chinese Academy of Sciences Department of Physics & Astronomy University of Victoria Departments of Physics and Astronomy Haverford College Space Telescope Science Institute Zhejiang Laboratory New Cornerstone Science Laboratory

The atomic-to-molecular gas conversion is a critical step in the baryon cycle of galaxies,which sets the initial conditions for subsequent star formation and influences the multi-phase interstellar *** compiled a sample of 94 nearby galaxies with observations of multi-phase gas contents by utilizing public H i,CO,and optical IFU data from the Ma NGA survey together with new FAST H i *** agreement with previous results,our sample shows that the global molecular-to-atomic gas ratio Rmol=log MH2/MH1is correlated with the global stellar mass surface density μ*with a Kendall’sτcoefficient of 0.25and p<10-3,less tightly but still correlated with stellar mass and NUV-r color,and not related to the specific star formation rate （sSFR）.The cold gas distribution and kinematics inferred from the H i and CO global profile asymmetry and shape do not significantly rely on *** to the availability of kpc-scale observations of Ma NGA,we decompose galaxies into H ii,composite,and AGN-dominated regions by using the BPT *** increasing Rmol,the fraction of H ii regions within1.5 effective radius decreases slightly;the density distribution in the spatially resolved BPT diagram also changes significantly,suggesting changes in metallicity and ionization *** with high Rmoltend to have high oxygen abundance,both at one effective radius with a Kendall’sτcoefficient of 0.37 (p<10-3) and their central *** all parameters investigated here,the oxygen abundance at one effective radius has the strongest relation with global *** dependence of gas conversion on gas distribution and galaxy ionization states is *** contrast,the observed positive relation between oxygen abundance（μ*） and Rmolindicates that the gas conversion is efficient in regions of high metallicity （density）.

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Reversing free-electron transfer of sulfide cocatalyst for exceptional photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第4期171卷 147-149页

作者： Yanfeng zhang Zhenyi zhang National Experimental Chemistry Teaching Center Hebei Key Laboratory of Inorganic Nano-materialsCollege of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024China Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission Key Laboratory of Photosensitive Materials and Devices of Liaoning ProvinceSchool of Physics and Materials EngineeringDalian Minzu UniversityDalian 116600China

Recently,Yu and co-workers deeply explore the potential impact of free electron transfer between co-catalysts and photocatalyst carriers on H_(2)evolution efficiency of active sites over MoS_(2+x).They pro-pose an electron-reversal tactics to evade the unexpected electron transfer and synchronously regulate the above transfer in a beneficial orientation for weakening hydrogen adsorption on S ***,this highlight not only discusses and summarizes the essences of electron reversal and the optimized H ad-sorption/desorption mechanism,but also emphasizes the significance of femtosecond transient absorp-tion spectroscopy(fs-TAS)and in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS)for revealing charge transfer dynamics and *** anticipate that this highlight can disseminate a new per-spective on the roles of photocatalyst carriers in improving cocatalytic H_(2)-production kinetics.

关键词： Photocatalysis Cocatalyst Electron reversal Antibonding-orbital occupancy S–H bonds

Deep Guided Attention Network for Joint Denoising and Demosaicing in Real Image

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Chinese Journal of Electronics 2024年第1期33卷 303-312页

作者： Tao zhang Ying FU Jun zhang School of Computer Science and Technology Beijing Institute of Technology Advanced Reasearch Institute of Multidisciplinary Science Beijing Institute of Technology

Denoising(DN) and demosaicing(DM) are the first crucial stages in the image signal processing pipeline. Recently, researches pay more attention to solve DN and DM in a joint manner, which is an extremely undetermined inverse problem. Existing deep learning methods learn the desired prior on synthetic dataset, which limits the generalization of learned network to the real world data. Moreover, existing methods mainly focus on the raw data property of high green information sampling rate for DM, but occasionally exploit the high intensity and signalto-noise(SNR) of green channel. In this work, a deep guided attention network(DGAN) is presented for real image joint DN and DM(JDD), which considers both high SNR and high sampling rate of green information for DN and DM, respectively. To ease the training and fully exploit the data property of green channel, we first train DN and DM sub-networks sequentially and then learn them jointly, which can alleviate the error accumulation. Besides, in order to support the real image JDD, we collect paired raw clean RGB and noisy mosaic images to conduct a realistic dataset. The experimental results on real JDD dataset show the presented approach performs better than the state-of-the-art methods, in terms of both quantitative metrics and qualitative visualization.

关键词： Training Visualization Inverse problems Green products Noise reduction Pipelines Signal processing

Value Iteration-Based Cooperative Adaptive Optimal Control for Multi-Player Differential Games With Incomplete Information

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 690-697页

作者： Yun zhang Lulu zhang Yunze Cai the Department of Automation Shanghai Jiao Tong UniversityShanghai 200240 the Key Laboratory of System Control and Information Processing Ministry of Education of ChinaShanghai 200240China

This paper presents a novel cooperative value iteration(VI)-based adaptive dynamic programming method for multi-player differential game models with a convergence *** players are divided into two groups in the learning process and adapt their policies *** method removes the dependence of admissible initial policies,which is one of the main drawbacks of the PI-based ***,this algorithm enables the players to adapt their control policies without full knowledge of others’ system parameters or control *** efficacy of our method is illustrated by three examples.

关键词： Adaptive dynamic programming incomplete information multi-player differential game value iteration

Host plant traits play a crucial role in shaping the composition of epiphytic microbiota in the arid desert,Northwest China

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Journal of Arid Land 2024年第5期16卷 699-724页

作者： zhang Jun zhang Yuanming zhang Qi State Key Laboratory of Desert and Oasis Ecology Key Laboratory of Ecological Safety and Sustainable Development in Arid LandsXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Xinjiang Key Laboratory of Biodiversity Conservation and Application in Arid Lands Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Xinjiang Field Scientific Observation Research Station of Tianshan Wild Fruit Forest Ecosystem Yili Botanical GardenXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China College of Life Sciences Shihezi UniversityShihezi 832003China

Phyllosphere microorganisms are a crucial component of environmental microorganisms,highly influenced by host characteristics,and play a significant role in plant health and ***,the impact of host characteristics on shaping phyllosphere microbial communities of plants with different life forms remains *** high-throughput sequencing technology,this study analyzed the diversity and community composition of phyllosphere epiphytic microorganisms(e.g.,bacteria and fungi)of various plant life forms in the hinterland of the Gurbantunggut Desert,Northwest *** annotation of prokaryotic taxa(FAPROTAX)and fungi function guild(FUNGuild)were employed to assess the ecological functions of microorganisms and to investigate the role of stochastic and deterministic processes in shaping phyllosphere microbial *** showed a diverse array of phyllosphere epiphytic microorganisms in the desert plants,with Proteobacteria,Cyanobacteria,and Actinobacteriota dominating bacterial community,while Ascomycota and Basidiomycota were prevalent in fungal *** across different plant life forms highlighted distinct microbial communities,indicating strong filtering effects by plant *** prediction identified intracellular parasites(accounting for 27.44%of bacterial community abundance),chemoheterotrophy(10.12%),and phototrophy(17.41%)as the main functions of epiphytic bacteria on leaves of different life form *** prediction indicated that phyllosphere epiphytic fungi primarily served as Saprotrophs(81.77%),Pathotrophs(17.41%),and Symbiotrophs(0.82%).Co-occurrence network analysis demonstrated a predominance of positive correlations among different microbial ***-Crick dissimilarity index analysis revealed that deterministic processes predominantly influenced phyllosphere bacterial and fungal community *** partitioning analysis and random forest modeling suggested that pla

关键词： phyllosphere epiphytic bacteria phyllosphere epiphytic fungi community structure community diversity functional diversity plant life form plant functional traits