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Electron vortex generations in photoionization of hydrogen atoms by circularly-polarized chirped attosecond pulses

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Communications in Theoretical Physics 2024年第1期76卷 111-118页

作者： Bingshuang Zhang Xiaoyu liu Fengzheng zhu liguang Jiao Aihua liu Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China School of Mathematics and Physics Hubei Polytechnic UniversityHuangshi 435003China College of Physics Jilin UniversityChangchun 130012China Helmholtz-Institut Jena D-07743 JenaGermany State Key Laboratory of Transient Optics and Photonics Chinese Academy of SciencesXi'an 710119China

By numerically solving the time-dependent Schr?dinger equation and employing the analytical perturbative model,we investigated the chirp-induced electron vortex in the photoionization of hydrogen atoms by a pair of counter-rotating circularly polarized chirped attosecond extremely ultraviolet *** demonstrated that single-photon ionization of hydrogen atoms generates photoelectron momentum distributions(PMDs)with distinct helical vortex structures either with or without a time delay between two counter-rotating circularly polarized laser *** structures are highly sensitive to both the time delay between the pulses and their chirp *** analytical model reveals that the splitting of vortex spirals is caused by the sign changing of the chirp-induced frequency-dependent time *** showed that to obtain the counterpart of the PMD under a pair of counter-rotating circularly polarized chirped pulses,both chirp parameters and ordering of pulses need to be reversed.

关键词： photoionization ultrafast processes ultrafast dynamics electron vortex

Anti-biofilm and anti-virulence potential of cell free supernatant of Akkermansia muciniphila against Salmonella

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Food Science and Human Wellness 2024年第5期13卷 2677-2689页

作者： Jiaxiu liu Wenxiu zhu Huanhuan liu Xiaomeng Ren Ningbo Qin xiaodong Xia National Engineering Research Center of Seafood School of Food Science and TechnologyDalian Polytechnic UniversityDalian 116034China

Akkermansia muciniphila is one of the commensals residing within the mammalian gut and co-evolving with the *** studies have demonstrated the benefits of *** in ameliorating metabolic disorders,while little is known about the antimicrobial potential of *** against ***,we examined the antimicrobial and anti-virulence properties of cell free supernatant(CFS)of *** against Salmonella *** retarded bacterial growth and inhibited the motility of *** SL1344 and *** *** dose-dependently reduced cell hydrophobicity and auto-aggregation of both ***,CFS from *** significantly attenuated biofilm *** with untreated bacteria,CFS-treated bacteria significantly decreased adhesion and invasion to Caco-2 cells,and reduced intracellular survival in *** maintained antimicrobial properties after treatment with high temperatures and various proteases,while it lost its antimicrobial activity after pH *** chromatography-mass spectrometry(GC-MS)confirmed that *** produced a certain amount of acetate and propionate,and ultra-high-performance liquid chromatography-mass spectrometry(UHPLCMS)identified other organic acids and metabolites in *** summary,CFS from *** exhibited anti-biofilm and anti-virulence properties against Salmonella and could be potentially utilized in the food industry for controlling Salmonella contamination and reducing infection.

关键词： Akkermansia muciniphila Salmonella Biofilm Motility Short-chain fatty acid Adhesion Invasion

Strong nonlinear optical processes with extraordinary polarization anisotropy in inversionsymmetry broken two-dimensional PdPSe

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Light(Science & Applications) 2024年第8期13卷 1524-1533页

作者： Song zhu Ruihuan Duan xiaodong Xu Fangyuan sun Wenduo Chen Fakun Wang Siyuan Li Ming Ye Xin Zhou Jinluo Cheng Yao Wu Houkun Liang Junichiro Kono Xingji Li Zheng liu Qi Jie Wang School of Electrical and Electronic Engineering Nanyang Technological University639798 SingaporeSingapore School of Material Science and Engineering Nanyang Technological University639798 SingaporeSingapore CINTRA CNRS/NTU/THALES UMI 3288Research Techno PlazaNanyang Technological University637371 SingaporeSingapore School of Materials Science and Engineering Harbin Institute of Technology150001 HarbinChina Department of Chemistry National University of Singapore117543 SingaporeSingapore GPL Photonics Lab State Key Laboratory of Applied OpticsChangchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina School of Electronics and Information Engineering Sichuan University610064 ChengduSichuanChina School of Physical and Mathematical Sciences Nanyang Technological University637371 SingaporeSingapore Departments of Electrical and Computer Engineering Physics and Astronomyand Materials Science and NanoEngineeringRice UniversityHoustonTXUSA

Nonlinear optical activities,especially second harmonic generation(SHG),are key phenomena in inversion-symmetrybroken two-dimensional(2D)transition metal dichalcogenides(TMDCs).On the other hand,anisotropic nonlinear optical processes are important for unique applications in nano-nonlinear photonic devices with polarization functions,having become one of focused research topics in the field of nonlinear ***,the strong nonlinearity and strong optical anisotropy do not exist simultaneously in common 2D ***,we demonstrate strong secondorder and third-order susceptibilities of 64 pm/V and 6.2×10^(-19)m^(2)/V^(2),respectively,in the even-layer PdPSe,which has not been discovered in other common TMDCs(e.g.,MoS2).Strikingly,it also simultaneously exhibited strong SHG anisotropy with an anisotropic ratio of~45,which is the largest reported among all 2D materials to date,to the best of our *** addition,the SHG anisotropy ratio can be harnessed from 0.12 to 45(375 times)by varying the excitation wavelength due to the dispersion ofχ^(2)*** an illustrative example,we further demonstrate polarized SHG imaging for potential applications in crystal orientation identification and polarization-dependent spatial *** findings in 2D PdPSe are promising for nonlinear nanophotonic and optoelectronic applications.

关键词： materials anisotropy nonlinear

Towards wafer-scale growth of two-dimensional cerium dioxide single crystal with high dielectric performance

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Nano Research 2024年第9期17卷 8592-8599页

作者： zhuofeng Shi Muhammad Imran Xiaohui Chen Xin liu Yaqi zhu Zhaoning Hu Saiyu Bu Jialin Zhang Chunhu Li xiaodong Zhang Li Lin College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266000China School of Materials Science and Engineering Peking UniversityBeijing 100871China Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China

Owing to the atomically thin nature,two-dimensional(2D)oxide materials have been widely reported to exhibit exciting transport and dielectric properties,such as fine gate controllability and ultrahigh carrier mobility,that outperform their bulk ***,unlike the successful synthesis of bulk oxide single crystals,reliable methods for synthesizing large-area single crystal of 2D oxide,that would suppress the negative influence from defective grain boundaries,remain unavailable,especially for nonlayered ***,we report that the lattice symmetry between the substrate and cerium dioxide(CeO_(2))would allow for the aligned nucleation and epitaxial growth of CeO_(2)on sapphire substrates,enabling the wafer-sized growth of CeO_(2)single *** careful tuning of the growth temperature and oxygen flow rate contributed to the harvesting of CeO_(2)wafer with reduced thickness and enhanced growth *** removal of grain boundaries improved the dielectric performance in terms of high dielectric strength(E_(bd)≈8.8 MV·cm^(-1)),suppressed leakage current,along with high dielectric constants(ε_(r)≈24).Our work demonstrates that with fine dielectric performance and ease of synthesizing wafer-sized single crystals,CeO_(2)can function as potential candidate as gate insulator for 2D-materials based nanoelectronics,and we believe the reported protocol of aligned nucleation can be extended to other 2D oxides.

关键词： dielectric materials two-dimensional materials chemical vapor deposition cerium dioxide

Advanced modeling of the absorption enhancement of black carbon particles in chamber experiments by considering the morphology and coating thickness

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Frontiers of Environmental Science & Engineering 2024年第9期18卷 129-142页

作者： xiaodong Wei Jianlin Hu Chao liu xiaodong Xie Junjie Yin Song Guo Min Hu Jianfei Peng Huijun Wang Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory of Meteorological Disaster(Ministry of Education)Nanjing University of Information Science and TechnologyNanjing 210044China Nansen−zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China East China Air Traffic Management Bureau CAAC Shanghai 200335China State Key Joint Laboratory of Environmental Simulation and Pollution Control International Joint Laboratory for Regional Pollution Control(IJRC)(Ministry of Education)College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China Tianjin Key Laboratory of Urban Transport Emission Research&State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin 300071China

Measurements studies have shown that the absorption of radiation by black carbon(BC)increases as the particles ***,there are significant discrepancies between the measured and modeled absorption enhancement(E_(abs)),largely due to the simplifications used in modeling the mixing states and shape *** took advantage of chamber experiments on BC aging and developed an efficient method to resolve the particle shape based on the relationship between the coating fraction(ΔD_(ve)/D_(ve),0)and fractal dimension(D_(f)),which can also reflect the variations of D_(f)during the whole BC aging *** with externally and partly mixed states(0≤ΔD_(ve)/D_(ve),0≤0.5)can be considered to be uniformly distributed with the D_(f)values of 1.8–2.1,whereas the Df values are constrained in the range 2.2–2.8 for fully mixed states(ΔD_(ve)/D_(ve),0>0.5).The morphological parameters(i.e.,the effective density and the dynamic shape factor)were compared with the measured values to verify the simulated *** simulated mean deviations of morphological parameters were smaller than 8%for the method resolving the particle *** applying a realistic shape and refractive index,the mass absorption cross for fully mixed states can be improved by 11%compared with a simplified core–shell *** on our understanding of the influence of D_(f)andΔD_(ve)/D_(ve),0 on E_(abs),we propose a two-stage calibration equation to correct the E_(abs)values estimated by the core–shell model,which reduces the simulation error in the Mie calculation by 6%–14%.

关键词： Black carbon Mixing states Fractal dimension Dynamic shape factor Absorption enhancement

Electron vortices generation of photoelectron of H_(2)^(+) by counter-rotating circularly polarized attosecond pulses

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Chinese Physics B 2024年第1期33卷 362-367页

作者：杨浩婧刘晓煜朱风筝焦利光刘爱华 Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China School of Mathematics and Physics Hubei Polytechnic UniversityHuangshi 435003China College of Physics Jilin UniversityChangchun 130012China Helmholtz-Institut Jena D-07743 JenaGermany State Key Laboratory of Transient Optics and Photonics Chinese Academy of SciencesXi'an 710119China

Molecular-frame photoelectron momentum distributions(MF-PMDs) of an H_(2)^(+) molecule ion in the presence of a pair of counter-rotating circularly polarized attosecond extreme ultraviolet laser pulses is studied by numerically solving the two-dimensional time-dependent Schrodinger equation within the frozen-nuclei approximation. At small time delay, our simulations show that the electron vortex structure is sensitive to the time delay and relative phase between the counterrotating pulses when they are partially overlapped. By adjusting time delay and relative phase, we have the ability to manipulate the MF-PMDs and the appearance of spiral arms. We further show that the internuclear distance can affect the spiral vortices due to its different transition cross sections in the parallel and perpendicular geometries. The lowest-order perturbation theory is employed to interpret these phenomena qualitatively. It is concluded that the internuclear distancedependent transition cross sections and the confinement effect in diatomic molecules are responsible for the variation of vortex structures in the MF-PMDs.

关键词： photoelectron momentum distribution attosecond pulse vortex

Beneficial Effects of Traditional Chinese Medicine Fuzheng Huayu on the Occurrence of Hepatocellular Carcinoma in Patients with Compensated Chronic Hepatitis B Cirrhosis Receiving Entecavir:A Multicenter Retrospective Cohort Study

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Journal of Clinical and Translational Hepatology 2024年第5期12卷 505-515页

作者： Haina Fan Shujuan Lei Zhimin Zhao Yan Huang Hui Wang Xudong liu xiaodong Li Min Xu Wei Zhang Kewei sun Huichun Xing Yang Mei Jiaquan Huang Chuanwu zhu Kejun Zhang Yali Zong Xizhong Shen Qing Xie Chenghai liu Institute of Liver Diseases Shanghai Key Laboratory of Traditional Chinese Clinical MedicineKey Laboratory of Liver and Kidney Diseases(Ministry of Education)Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese MedicineShanghaiChina Department of Infectious Diseases Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina Department of Infectious Diseases Ruikang Hospital Affiliated to Guangxi University of Chinese MedicineNanningGuangxiChina Institute of Liver Diseases Hubei Provincial Hospital of Traditional Chinese MedicineWuhanHubeiChina Department of Infectious Diseases Huaian Fourth People’s HospitalHuai’anJiangsuChina Institute of Liver Diseases Shijiazhuang Fifth HospitalShijiazhuangHebeiChina Department of Liver Diseases The First Hospital of Hunan University of Chinese MedicineChangshaHunanChina Center of Hepatology Capital Medical University Affiliated Beijing Ditan HospitalBeijingChina Department of Hepatology The Fifth People’s Hospital of AnyangAnyangHenanChina Department and Institute of Infectious Disease Tongji Hospital of Tongji Medical College of Huazhong University of Science and TechnologyWuhanHubeiChina Department of Hepatology The Fifth People’s Hospital of SuzhouSuzhouJiangsuChina Department of Gastroenterology The First People’s Hospital of JingmenJingmenHubeiChina Department of Integrated Traditional and Western Medicine The Ninth Hospital of NanchangNanchangJiangxiChina Department of Gastroenterology Zhongshan HospitalFudan UniversityShanghaiChina

Background and Aims:The application of antifibrotic drugs to treat patients with chronic liver diseases who are receiving antiviral therapies for hepatocellular carcinoma(HCC)has not been ***,we aimed to assess the impact of the Traditional Chinese Medicine Fuzheng Huayu(FZHY)on the occurrence of HCC in patients with hepatitis B virus-related compensated cirrhosis receiving the antiviral drug entecavir(ETV).Methods:A multicenter retrospective cohort study was *** liver cirrhosis patients were divided into the ETV+FZHY group or the ETV group according to *** cumulative incidence of HCC was analyzed using Kaplan-Meier and log-rank *** score matching was used for confounding *** analysis and Cox regression were used to determine the effects of FZHY on the occurrence of HCC and liver function ***:Out of 910 chronic hepatitis B patients,458 were in the ETV+FZHY group and 452 were in the ETV *** propensity score matching,the 5-year cumulative incidence of HCC was 9.8%in the ETV+FZHY group and 21.8%in the ETV group(p36 ***,diabetes,alanine aminotransferase,􀇄-glutamyl transpeptidase,albumin,hepatitis B e-antigen,and fibrosis 4 score were associated with the occurrence of *** decreased the risk of HCC in patients aged>45 years with a hepatitis B virus DNA level of􀂕2,000 IU/***:Adjunctive FZHY treatment reduced HCC occurrence in patients with hepatitis B virus cirrhosis who were treated with ETV,possibly due to the antifibrotic properties of FZHY.

关键词： Entecavir Fuzheng Huayu Hepatitis B virus Cirrhosis Hepatocellular carcinoma Traditional Chinese Medicine

Synthesis of Large-Sized van der Waals Layered MoO_(3)Single Crystals with Improved Dielectric Performance

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Precision Chemistry 2024年第8期2卷 406-413页

作者： Yaqi zhu Beiming Yu Xin liu Jialin Zhang zhuofeng Shi Zhaoning Hu Saiyu Bu Chunhu Li xiaodong Zhang Li Lin College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266000P.R.China School of Materials Science and Engineering and Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871P.R.China School of Materials Science and Engineering Peking UniversityBeijing 100871P.R.China Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100P.R.China

The applications of two-dimensional semiconductors strictly require the reliable integration of ultrathin high-κdielectric materials on the semiconductor surface to enable fine gate control and low power *** layered oxide materials,MoO_(3)can be potentially used as a high-κtwo-dimensional material with a larger bandgap and high electron *** this work,relying on the oxidization of molybdenum chlorides,we have synthesizedα-MoO_(3)single crystals,which can be easily exfoliated into flakes with thicknesses of a few nanometers and sizes of hundreds of micrometers and fine thermal *** on measurement results of conventional metal/insulator/metal devices and graphene based dual-gate devices,the as-received MoO_(3)nanosheets exhibit improved dielectric performance,including high dielectric constants and competitive breakdown field *** work demonstrates that MoO_(3)with improved crystalline quality is a promising candidate for dielectric materials with a large gate capacitance in future electronics based on two-dimensional materials.

关键词： high-κ dielectric materials layered oxide materials single crystal high dielectric constants breakdown field strength

Stimulation of gaseous phosphine production from Antarctic seabird guanos and ornithogenic soils

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Journal of Environmental Sciences 2009年第2期21卷 150-154页

作者： zhu renbin liu Yashu sun Jianjun sun liguang GENG Jinju Institute of Polar Environment University of Science and Technology of China Hefei 230026 China State Key Laboratory of PoUution Control and Resource Reuse Nanjing University Nanjing 210093 China

Matrix-bound phosphine （MBP） is a general term used to indicate non-gaseous reduced phosphorus compounds that are transformed into phosphine gas upon reaction with bases or acids. Antarctic seabird guanos and ornithogenic soils were used as materials to compare the different digestion methods for transforming matrix-bound phosphine into phosphine gas. The results demonstrated that more phosphine gas in most of Antarctic environmental materials was formed of matrix-bound phosphine by caustic digestion than by acidic digestion. The comparative study on different digestion methods also revealed that the fraction of MBP converted to gaseous phosphine during the digestion depended on the temperature. The optimal digestion temperature was close to 70℃and the optimal digestion time was about 20 min. Acidic conditions were more favorable for the release of matrix-bound phosphine compared to the neutral conditions. A proper water dilution can increase the production and emission of phosphine from the Antarctic penguin guanos.

关键词： phosphine matrix-bound phosphine ornithogenic soil Antarctica penguin guano