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激光场中原子阈上电离的强场近似方法研究

原子与分子物理学报 2025年第2期42卷 111-116页

作者：仝小刚薛玉峰张治国杨淑萍陇南师范高等专科学校机电工程学院陇南742500 陕西理工大学数学与计算机科学学院汉中723000

强激光与原子相互作用的基本现象是原子的电离,其中阈上电离是一种非常重要的强场电离现象,许多方法被用于研究激光场中原子的阈上电离性质,其中强场近似方法是十分重要的理论方法之一.本文利用时间演化算符及鞍点近似论述了激光场中单... 详细信息

强激光与原子相互作用的基本现象是原子的电离,其中阈上电离是一种非常重要的强场电离现象,许多方法被用于研究激光场中原子的阈上电离性质,其中强场近似方法是十分重要的理论方法之一.本文利用时间演化算符及鞍点近似论述了激光场中单原子阈上电离行为的二级强场近似理论,其中一阶近似项给出低能电子的直接电离振幅,二阶近似项描述电子与母离子的重散射过程,表示高能光电子的电离振幅.文章给出了强场近似理论下线性极化的激光场中光电子能谱和电离概率,为应用强场近似方法模拟研究激光场中单原子的动力学行为提供了一定的理论参考和依据.

关键词：阈上电离强场近似 Schr9dinger方程时间演化算符鞍点近似

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Protective effects of acupuncture and LGNHFD on expressions of vascular endothelial growth factor, basic fibroblast growth factor,and cluster of differentiation 34 in rats with cerebral ischemia-reperfusion injury

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Journal of Traditional Chinese Medicine 2021年第3期41卷 463-469页

作者： yang Le yang Baocun ZHANG Caixia tong Jie FENG Geli xiao Gaiqin Department of Traditional Chinese Medicine the first Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710061China School of Foreign Languages Shaanxi Normal UniversityXi'an Shaanxi Normal UniversityXi'an 710062China Newcastle University Newcastle upon Tyne NE17RUUK 不详

OBJECTIVE: To investigate the protective effects of electroacupuncture and LGNHFD on cerebral ischemia-reperfusion injury, and their effects on the expression of cluster of differentiation 34(CD 34), vascular endothelial growth factor(VEGF), and basic fibroblast growth factor(b FGF) in the peripheral tissue of the cerebral ischemic semi-dark zone in *** influence and mechanism of ***: Healthy male Sprague-Dawley rats were randomly divided into the sham operation group, model group, Traditional Chinese Medicine (TCM) group, electroacupuncture group, and acupuncture group. The cerebral ischemia model was prepared by middle artery occlusion. The electroacupuncture and TCM groups received electroacupuncture at the "Neiguan(PC6)", "Baihui(GV20)", and "Renzhong(GV26)" acupoints from 4 h after modeling, once daily for 14 d. After modeling,the acupuncture and TCM groups were administered LGNHFD once daily for 14 d. After treatment,the infarct volume and regional cerebral blood flow(r CBF) were measured in each group, the expression of CD34 in the surrounding ischemic penumbra was determined using immunohistochemistry,and the expression of angiogenesis-related factors in the ischemic hemisphere was detected by western ***: Compared with the sham operation group, r CBF was significantly decreased(P < 0.01)and cerebral infarction volume was significantly increased(P < 0.01) in the model group at four time points(5 min and 3, 7, and 14 d after modeling). At three postoperative time points(3, 7, and 14 d), the number of CD34 + cells in the model group were significantly increased(P < 0.01), and the relative expression levels of VEGF, b FGF, and CD34+ in the ischemic hemisphere were significantly increased(P < 0.01, P < 0.05). Compared with the model group, the r CBF of the acupuncture group was significantly increased at 3, 7, and 14 d after intervention(P < 0.01), while the r CBF of the electroacupuncture and TCM groups was significantly increased a

关键词： Electroacupuncture LGNHFD brain ischemia antigens CD34 vascular endothelial growth factors fibroblast growth factors

Gut microbiome composition in patients with liver cirrhosis with and without hepatic encephalopathy: A systematic review and metaanalysis

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World Journal of Hepatology 2025年第1期17卷 96-111页

作者： xiao-tong Xu Min-Jie Jiang Yun-Lai Fu Fang Xie Jian-Jun Li Qing-Hua Meng Beijing Institute of Hepatology Beijing YouAn HospitalCapital Medical UniversityBeijing 100069China Interventional Therapy Center for Oncology Beijing YouAn HospitalCapital Medical UniversityBeijing 100069China Department of Infectious Diseases Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinan 250000Shandong ProvinceChina

BACKGROUND The gut microbiome is associated with hepatic encephalopathy(HE),but research results on the gut microbiome characteristics of patients with liver cirrhosis with and without HE are *** To study the gut microbiota characteristics of patients with liver cirrhosis with and without *** We searched the PubMed,Web of Science,EMBASE,and Cochrane databases using two keywords,HE,and gut *** to the inclusion and exclusion criteria,suitable literature was screened to extract data on the diversity and composition of the fecal microbiota in patients with liver cirrhosis with and without *** data were analyzed using RevMan and *** Seventeen studies were included:(1)A meta-analysis of 7 studies revealed that the Shannon index in liver cirrhosis patients with HE was significantly lower than that in patients without HE[-0.20,95%confidence interval(CI):-0.28 to-0.13,I2=20%];(2)The relative abundances of Lachnospiraceae(-2.73,95%CI:-4.58 to-0.87,I2=38%)and Ruminococcaceae(-2.93,95%CI:-4.29 to-1.56,I2=0%)in liver cirrhosis patients with HE was significantly lower than those in patients without HE;(3)In patients with HE,Enterococcus,Proteobacteria,Enterococcaceae,and Enterobacteriaceae proportions increased,but Ruminococcaceae,Lachnospiraceae,Prevotellaceae,and Bacteroidetes proportions decreased;(4)Differences in the fecal metabolome between liver cirrhosis patients with and without HE were detected;and(5)Differential gut microbiomes may serve as diagnostic and prognostic *** The gut microbiomes of patients with liver cirrhosis with and without HE *** gut microbiomes may distinguish liver cirrhosis patients with or without HE and determine patient prognosis.

关键词： Gut microbiome Cirrhosis Hepatic encephalopathy Review Meta-analysis

VOC characteristics and their source apportionment in a coastal industrial area in the yangtze River Delta, China

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Journal of Environmental Sciences 2023年第5期127卷 483-494页

作者： Mengrong yang Fengxia Li Cenyan Huang Lei tong xiaorong Dai Hang xiao Center for Excellence in Regional Atmospheric Environment&Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo(Beilun)Zhongke Haixi Industrial Technology Innovation CenterNingbo 315800China University of Chinese Academy of Sciences Beijing 100049China Department of Neuro-and Sensory Physiology University Medical Center GotingenHumboldtallee 2337073 GotingenGermany Center for Biostructural Imaging of Neurodegeneration University Medical Center Gotingenvon-Siebold-Straβ3α37075GotingenGermany College of Biological and Environmental Sciences Zhejiang Wanli UniversityNingbo 315100China

Volatile organic compounds(VOCs)are important precursors of secondary organic compounds and ozone,which raise major environmental *** investigate the VOC emission characteristics,measurements of VOCs based on proton transfer reaction-mass spectrometry during 2017 were conducted in a coastal industrial area in Ningbo,Zhejiang Province,*** on seasonal variation in species concentration,the positive matrix factorization(PMF)receptor model was applied to apportion the sources of VOCs in each *** PMF results revealed that unknown acetonitrile source,paint solvent,electronics industry,biomass burning,secondary formation and biogenic emission were mainly attributed to VOC *** burning and secondary formation were the major sources of VOCs and contributed more than 70%of VOC emissions in spring and ***-related sources contributed 8.65%–31.2%of the VOCs throughout the *** unknown acetonitrile source occurred in winter and spring,and contributed 7.6%–43.73%of the VOC emissions in the two *** probability function(CPF)analysis illustrated that the industry sources came from local emission,while biomass burning and biogenic emission mainly came from the northwest *** potential source contribution function(PSCF)model showed that secondary formation-related source was mainly from Jiangsu Province,northeastern China and the surrounding *** potential source areas of unknown acetonitrile source were northern Zhejiang Province,southern Jiangsu Province and the northeastern coastal marine environments.

关键词： Volatile organic compounds Proton transfer reaction-mass spectrometry PMF source apportionment Seasonal characteristics

Polydopamine-modified biochar supported polylactic acid and zero-valent iron affects the functional microbial community structure for 1,1,1-trichloroethane removal in simulated groundwater

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Chinese Chemical Letters 2025年第1期36卷 420-426页

作者： Haitao Yin Liang Meng Li Li Jiamu xiao Longrui Liang Nannan Huang Yansong Shi Angang Zhao Jingwen Hou School of Environmental and Geographical Sciences Shanghai Normal UniversityShanghai 200234China yangtze River Delta Urban Wetland Ecosystem National Field Scientific Observation and Research Station Shanghai 201722China Instrumental Analysis Center Shanghai Jiao Tong UniversityShanghai 200240China

In-situ enhanced bioreduction by functional materials is a cost-effective technology to remove chlorinated hydrocarbons in ***,a novel polydopamine(PDA)-modified biochar(BC)-based composite containing nanoscale zero-valent iron(n ZVI)and poly-l-lactic acid(PLLA)(PB-PDA-Fe)was synthesized to enhance the removal of 1,1,1-trichloroethane(1,1,1-TCA)in simulated groundwater with actual site *** impact on functional microbial community structure in system was also *** typical characterizations revealed uniform dispersion of PLA and n ZVI particles on the BC surface,being smoother after PDA *** composite exhibited a significantly higher performance on 1,1,1-TCA removal(82.38%,initial concentration 100 mg/L)than Fe-PDA and PB-PDA *** diversity and richness of the microbial community in the composite treatment consistently decreased during incubation due to a synergistic effect between PLLA-BC and n ***,Pedobacter,Sphaerochaeta,Shewanella,and Clostridium were identified as enriched genera by the composite through DNA-stable isotope probing(DNA-SIP),playing a crucial role in the bioreductive dechlorination *** the above results demonstrate that this novel composite selectively enhances the activity of microorganisms with extracellular respiration functions to efficiently dechlorinate 1,1,*** findings could contribute to understanding the responsive microbial community by carbon-iron composites and expedite the application of in-situ enhanced bioreduction for effective remediation of chlorinated hydrocarbon-contaminated groundwater.

关键词： Biochar-based composite Bioreductive dechlorination 1,1,1-TCA Extracellular respiration microorganisms Groundwater

Characteristics and efficiency of a new vibrating screen with a swing trace

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Particuology 2013年第5期11卷 601-606页

作者： Jianzhang xiao Xin tong School of Mechanical Engineering and Automation Huaqiao University

A new vibration type and motion characteristics were proposed according to the principle of manual sie- ving. A mechanical model of the new motion was established and the characteristics of the new vibrating screen were analyzed to establish its equation of motion by using the vibration theory, to include as tech- nological parameters, amplitude, movement velocity, and throwing index through theoretical calculation. The efficiency of particle screening was studied at different values of frequency and swing declination angle. The discrete element method （DEM） was used to simulate the screening with the swing trace. The functional relationship between screening efficiency and the parameters was fitted with the least square method. The results show that high frequency and large swing angle are suitable for small particles, while small values are suitable for particles close to the aperture size. Compared to the linear vibration trace, both screening efficiency and processing capacity were effectively improved.

关键词： Motion characteristicSwing traceScreening efficiencySimulation

Recent progress on nanostructure-based broadband absorbers and their solar energy thermal utilization

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Frontiers of Chemical Science and Engineering 2021年第1期15卷 35-48页

作者： tong Zhang Shan-Jiang Wang xiao-yang Zhang Ming Fu Yi yang Wen Chen Dan Su Joint International Research Laboratory of Information Display and Visualization School of Electronic Science and EngineeringSoutheast UniversityNanjing 210096China Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of EducationSchool of Instrument Science and EngineeringSoutheast UniversityNanjing 210096China Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology Suzhou Research Institute of Southeast UniversitySuzhou 215123China

Nanostructure-based broadband absorbers are prominently attractive in various research fields such as nanomaterials,nanofabrication,nanophotonics and energy utilization.A highly efficient light absorption in wider wavelength ranges makes such absorbers useful in many solar energy harvesting *** this review,we present recent advances of broadband absorbers which absorb light by *** start from the mechanism and design strategies of broadband absorbers based on different materials such as carbon-based,plasmonic or dielectric materials and then reviewed recent progress of solar energy thermal utilization dependent on the superior photo-heat conversion capacity of broadband absorbers which may significantly influence the future development of solar energy utilization,seawater purification and photoelectronic device design.

关键词： nanostructured broadband absorbers solar energy harvesting thermal utilization

High Purity Hydrogen Production by Metal Hydride System:A Parametric Study Based on the Lumped Parameter Model

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Journal of Wuhan University of Technology(Materials Science) 2021年第1期36卷 127-135页

作者： KOUA Koua Alain Jesus tong Liang yang Tianqi xiao Jinsheng School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Advanced Technology for Automotive Components Hubei Collaborative Innovation Center for Automotive Components Technology and Hubei Research Center for New Energy&Intelligent Connected VehicleWuhan University of TechnologyWuhan 430063China Reliability Engineering Institute School of Energy and Power EngineeringWuhan University of TechnologyWuhan 430070China Hydrogen Research Institute Universitédu QuébecàTrois-RivièresQC G9A 5H7Canada

The simulation of hydrogen purification in a mixture gas of hydrogen/carbon dioxide (H2/CO2) by metal hydride system was *** lumped parameter model was developed and *** validated model was implemented on the software Matlab/Simulink to simulate the present *** simulation results demonstrate that the purification efficiency depends on the external pressure and the venting *** increase in the external pressure and enough venting time makes it possible to effectively remove the impurities from the tank during the venting process and allows to desorb pure *** impurities are partially removed from the tank for low external pressure and venting time during the venting process and the desorbed hydrogen is *** parameters such as the overall heat transfer coefficient,solid material mass,supply pressure,and the ambient temperature influence the purification system in terms of the hydrogen recovery *** increase in the overall heat transfer coefficient,solid material mass,and supply pressure improves the hydrogen recovery rate while a decrease in the ambient temperature enhances the recovery rate.

关键词： hydrogen production hydrogen purification carbon dioxide metal hydride lumped parameter parametric study

In situ polymerization preparation and mechanical properties of nanocomposites based on PA10T/10I-block-PEG copolymer and graphene oxide

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Nano Materials Science 2022年第3期4卷 276-284页

作者： xiao-bo Fu Xin tong Jia-cao yang Gang Zhang Mei-lin Zhang xiao-jun Wang Jie yang College of Polymer Science and Engineering Sichuan UniversityChengdu610065China Analytical and Testing Center Sichuan UniversityChengdu610064China Jiangsu JITRI Advanced Polymer Materials Research Institute Co. LtdChina State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu610065China

Poly(decamethylene terephthalamide/decamethylene isophthalamide)-block-polyvinyl alcoho)(PA10 T/10 IPEG) copolymer/graphene oxide(GO) composites were prepared via in-situ melt polymerization and two different nano-filler addition approaches were compared. The relationship between the micro-structure and performance of the elastomer composites prepared by one-step and two-step methods was explored. The results show that the two-step method significantly promoted the dispersion of the GO in a polymer matrix, and facilitated the grafting of more hard molecular chains. Thus, the elastic modulus and tensile strength of the nanocomposite have been significantly improved by the presence of GO. This was because of the strong interaction between the functional groups on the surface of the GO and the hard molecular chains. This would be also be favorable to load transfer across the interface. Additionally, the elongation at the break of composites increased by 10% with the addition of a small amount of GO(0.2% wt). This is because hard domains tend to be enriched on the surface of GO in composites and act as a lubricating layer at the interface between the GO and matrix, leading to increased deformation ability. This work provides an effective strategy to prepare elastomer composites with high strength and toughness.

关键词： Graphene oxide Thermoplastic elastomer In-situ polymerization Composite