检索结果-南通市图书馆

Reconstructing coherent dynamics of bound states induced by strong attosecond XUV pulses

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第2期22卷 56-63页

作者：贾利娟刘明清王新强徐龙闫培光姜维超傅立斌 Institute of Quantum Precision Measurement College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Department of Physics Xiamen UniversityXiamen 361005China Graduate School of China Academy of Engineering Physics Beijing 100193China

We propose a scheme that utilizes weak-field-induced quantum beats to investigate the electronic coherences of atoms driven by a strong attosecond extreme ultraviolet(XUV)*** technique involves using a strong XUV pump pulse to excite and ionize atoms and a time-delayed weak short pulse to probe the photoelectron *** theoretical analysis demonstrates that the information regarding the bound states,initiated by the strong pump pulse,can be precisely reconstructed from the weak-field-induced quantum beat *** examine this scheme,we apply it to the attosecond XUV laser-induced ionization of hydrogen atoms by solving a three-dimensional time-dependent Schr?dinger *** work provides an essential reference for reconstructing the ultrafast dynamics of bound states induced by strong XUV attosecond pulses.

关键词： attosecond pulse bound-state dynamics quantum beats

Solving the time-dependent Schrödinger equation by combining smooth exterior complex scaling and Arnoldi propagator

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第1期31卷 227-234页

作者： Shun Wang wei-chao jiang College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

Abstract We develop a highly efficient scheme for numerically solving the three-dimensional time-dependent Schrödinger equation of the single-active-electron atom in the field of laser pulses by combining smooth exterior complex scaling(SECS)absorbing method and Arnoldi propagation *** combination has not been reported in the *** proposed scheme is particularly useful in the applications involving long-time wave *** SECS is a wonderful absorber,but its application results in a non-Hermitian Hamiltonian,invalidating propagators utilizing the Hermitian symmetry of the *** demonstrate that the routine Arnoldi propagator can be modified to treat the non-Hermitian *** efficiency of the proposed scheme is checked by tracking the time-dependent electron wave packet in the case of both weak extreme ultraviolet(XUV)and strong infrared(IR)laser *** perfect absorption and stable propagation are observed.

关键词： time-dependent Schrödinger equation(TDSE) smooth exterior complex scaling(SECS)absorb-ing method Arnoldi propagator

Testing a solar coronal magnetic field extrapolation code with the Titov–Dmoulin magnetic flux rope model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第1期16卷 129-134页

作者： chao-wei jiang Xue-Shang Feng SIGMA Weather Group State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China

In the solar corona, the magnetic flux rope is believed to be a fundamental structure that accounts for magnetic free energy storage and solar eruptions. Up to the present, the extrapolation of the magnetic field from boundary data has been the primary way to obtain fully three-dimensional magnetic information about the corona. As a result, the ability to reliably recover the coronal magnetic flux rope is important for coronal field extrapolation. In this paper, our coronal field extrapolation code is examined with an analytical magnetic flux rope model proposed by Titov ＆ D6moulin, which consists of a bipolar magnetic configuration holding a semi-circular line-tied flux rope in force-free equilibrium. By only using the vector field at the bottom boundary as input, we test our code with the model in a representative range of parameter space and find that the model field can be reconstructed with high accuracy. In particular, the magnetic topological interfaces formed between the flux rope and the surrounding arcade, i.e., the ＂hyperbolic flux tube＂ and ＂bald patch separatrix surface,＂ are also reliably reproduced. By this test, we demonstrate that our CESE-MHD-NLFFF code can be applied to recovering the magnetic flux rope in the solar corona as long as the vector magnetogram satisfies the force-free constraints.

关键词： magnetic fields -- magnetohydrodynamics (MHD) -- methods: numerical -- Sun: corona

A comparison study of a solar active-region eruptive filament and a neighboring non-eruptive filament

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第1期16卷 151-158页

作者： chao-wei jiang Shi-Tsan Wu Xue-Shang Feng Qiang Hu SIGMA Weather Group State Key Laboratory for Space WeatherNational Space Science CenterChinese Academy of Sciences Center for Space Plasma & Aeronomic Research The University of Alabama in Huntsville Department of Mechanical & Aerospace Engineering The University of Alabama in Huntsville Department of Space Sciences The University of Alabama in Huntsville

Solar active region （AR） 11283 is a very magnetically complex region and it has produced many eruptions. However, there exists a non-eruptive filament in the plage region just next to an eruptive one in the AR, which gives us an opportunity to perform a comparison analysis of these two filaments. The coronal magnetic field extrapolated using our CESE-MHD-NLFFF code reveals that two magnetic flux ropes （MFRs） exist in the same extrapolation box supporting these two filaments, respectively. Analysis of the magnetic field shows that the eruptive MFR contains a bald-patch separatrix surface （BPSS） co- spatial very well with a pre-eruptive EUV sigmoid, which is consistent with the BPSS model for coronal sigmoids. The magnetic dips of the non-eruptive MFRs match Hα observation of the non-eruptive filament strikingly well, which strongly supports the MFR-dip model for filaments. Compared with the non-eruptive MFR/filament （with a length of about 200 Mm）, the eruptive MFR/filament is much smaller （with a length of about 20 Mm）, but it contains most of the magnetic free energy in the extrapolation box and holds a much higher free energy density than the non-eruptive one. Both the MFRs are weakly twisted and cannot trigger kink instability. The AR eruptive MFR is unstable because its axis reaches above a critical height for torus instability, at which the overlying closed arcades can no longer confine the MFR stably. On the contrary, the quiescent MFR is very firmly held by its overlying field, as its axis apex is far below the torus-instability threshold height. Overall, this comparison investigation supports that an MFR can exist prior to eruption and the ideal MHD instability can trigger an MFR eruption.

关键词： magnetic fields -- Sun: corona -- Sun: filaments -- Sun: eruptions

A magnetic bald-patch flare in solar active region 11117

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第9期17卷 51-60页

作者： chao-wei jiang Xue-Shang Feng Shi-Tsan Wu Qiang Hu Institute of Space Science and Applied Technology Harbin Institute of Technology SIGMA Weather Group State Key Laboratory for Space Weather Center for Space Science and Applied ResearchChinese Academy of Sciences Center for Space Plasma and Aeronomic Research The University of Alabama in Huntsville

With SDO observations and a data-constrained magnetohydrodynamics （MHD） model, we identify a confined multi-ribbon flare that occurred on 2010 October 25 in solar active region 11117 as a magnetic bald patch （BP） flare with strong evidence. From the photospheric magnetic field observed by SDO/HMI, we find there are indeed magnetic BPs on the polarity inversion lines （PILs） which match parts of the flare ribbons. From the 3D coronal magnetic field derived from an MHD relaxation model constrained by the vector magnetograms, we find strikingly good agreement of the BP separatrix surface （BPSS） footpoints with the flare ribbons, and the BPSS itself with the hot flaring loop system. Moreover, the triggering of the BP flare can be attributed to a small flux emergence under the lobe of the BPSS, and the relevant change of coronal magnetic field through the flare is reproduced well by the pre-flare and post-flare MHD solutions, which match the corresponding pre- and post-flare AIA observations, respectively. Our work contributes to the study of non-typical flares that constitute the majority of solar flares but which cannot be explained by the standard flare model.

关键词： Sun flares -- Sun corona- magnetic fields - magnetohydrodynamics (MHD) - methods numerical

Length Scale of Photospheric Granules in Solar Active Regions

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第8期22卷 103-110页

作者： Yan-Xiao Liu chao-wei jiang Ding Yuan Ping-Bing Zuo Wen-Da Cao Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518055China New Jersey Institute of Technology Center for Solar ResearchNewarkNJUSA Big Bear Solar Observatory 40386 North Shore LaneBig Bear CityCAUSA

Investigating the length scales of granules could help understand the dynamics of granules in the *** this work,we detected and identified granules in an active region near disk center observed at wavelength of TiO(7057?)by the 1.6 m Goode Solar Telescope(GST).By a detailed analysis of the size distribution and flatness of granules,we found a critical size that divides the granules in motions into two regimes:convection and *** length scales of granules with sizes larger than 600 km follow Gauss function and demonstrate“flat”in flatness,which reveal that these granules are dominated by *** with sizes smaller than 600 km follow power-law function and behave power-law tendency in flatness,which indicate that the small granules are dominated by ***,for the granules in active regions,they are originally convective in large length scale,and directly become turbulent once their sizes turn to small,likely below the critical size of 600 *** with the granules in quiet regions,they evolve with the absence of the mixing motions of convection and *** a difference is probably caused by the interaction between fluid motions and strong magnetic fields in active *** strong magnetic fields make high magnetic pressure which creates pressure walls and slows down the evolution of convective *** walls cause convective granules extending to smaller sizes on one hand,and cause wide intergranular lanes on the other *** small granules isolated in such wide intergranular lanes are continually sheared,rotated by strong downflows in surroundings and hereby become turbulent.

关键词： Sun:granulation Sun:photosphere Sun:faculae plages

Comparative study of photoionization of atomic hydrogen by solving the one-and three-dimensional time-dependent Schrödinger equations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第8期30卷 327-336页

作者： Shun Wang Shahab Ullah Khan Xiao-Qing Tian Hui-Bin Sun wei-chao jiang College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China

We develop a numerical scheme for solving the one-dimensional(1D)time-dependent Schrödinger equation(TDSE),and use it to study the strong-field photoionization of the atomic *** photoelectron energy spectra obtained for pulses ranging from XUV to near infrared are compared in detail to the spectra calculated with our well-developed code for accurately solving the three-dimensional(3D)*** XUV pulses,our discussions cover intensities at which the ionization is in the perturbative and nonperturbative *** pulses of 400 nm or longer wavelengths,we distinguish the multiphoton and tunneling *** and discrepancies between the 1D and 3D calculations in each regime are *** observed discrepancies mainly originate from the differences in the transition matrix elements and the energy level structures created in the 1D and 3D calculations.

关键词： time-dependent Schrodinger equation(TDSE) strong-field ionization photoelectron spectra dynamic interference

Lipid metabolism analysis in esophageal cancer and associated drug discovery

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2024年第1期14卷 1-15页

作者： Ruidi Jiao wei jiang Kunpeng Xu Qian Luo Luhua Wang chao Zhao Bionic Sensing and Intelligence Center Institute of Biomedical and Health EngineeringShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong518000China Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital&Shenzhen HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeShenzhenGuangdong518116China School of Medicine Southern University of Science and TechnologyShenzhenGuangdong518000China University of Chinese Academy of Sciences Beijing100049China Shenzhen Key Laboratory of Precision Diagnosis and Treatment of Depression Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenGuangdong518000China

Esophageal cancer is an upper gastrointestinal malignancy with a bleak *** is still being explored in depth due to its complex molecular mechanisms of occurrence and *** play a crucial role in cells by participating in energy supply,biofilm formation,and signal transduction processes,and lipid metabolic reprogramming also constitutes a significant characteristic of malignant *** and more studies have found esophageal cancer has obvious lipid metabolism abnormalities throughout its beginning,progress,and treatment *** inhibition of tumor growth and the enhancement of antitumor therapy efficacy can be achieved through the regulation of lipid ***,we reviewed and analyzed the research results and latest findings for lipid metabolism and associated analysis techniques in esophageal cancer,and comprehensively proved the value of lipid metabolic reprogramming in the evolution and treatment resistance of esophageal cancer,as well as its significance in exploring potential therapeutic targets and biomarkers.

关键词： Lipid metabolism Esophageal cancer Progression Treatment resistance New therapeutic targets

New strategy for boosting cathodic performance of low temperature solid oxide fuel cells via chlorine doping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8086-8094页

作者： ShaoHua Xu Hao Qiu Shanshan jiang Jingjing jiang wei Wang Xiaomin Xu wei Kong Tanaka Dennis Chivurugwi Arkadii Proskurin Daifen Chen chao Su School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212100China Institute of Analysis and Testing Beijing Academy of Science and TechnologyBeijing 100089China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWA6102Australia Admiral Makarov National University of Shipbuilding Heroiv Ukrainy av.9Mykolaiv54025Ukraine

To enhance the performance and widespread use of solid oxide fuel cells(SOFCs),addressing the low-temperature(<650℃)electrochemical performance and operational stability issues of cathode materials is ***,we propose an innovative approach to enhance oxygen ion mobility and electrochemical performance of perovskite oxide by substituting some oxygen sites with chlorine *** designed SrTa_(0.1)Fe_(0.9)O_(3-δ-x)Clx(x=0.05 and 0.10)exhibits improved performance compared to SrTa_(0.1)Fe_(0.9)O_(3-δ)(STF).SrTa_(0.1)Fe_(0.9)O_(2.95-δ)Cl_(0.05)(STFCl0.05)shows the lowest area-specific resistance(ASR)value on Sm0.2Ce0.8O1.9(SDC)*** 600℃,STFCl0.05 achieves an ASR value of 0.084Ω·cm^(2),and a single cell with STFCl0.05 reaches a higher peak power density(PPD)value(1143 mW·cm^(-2))than that with STF(672 mW·cm^(-2)).Additionally,besides exhibiting excellent oxygen reduction reaction(ORR)activity at lower temperatures,the STFCl0.05 cathode demonstrates good CO_(2)tolerance and operational *** cell operation lasts for 150 h,and single cell operation endures for 720 h without significant performance *** chlorine doping approach effectively enhances ORR activity and stability,making STFCl0.05 a promising cathode material for low-temperature SOFCs.

关键词： low-temperature solid oxide fuel cells(LT-SOFCs) oxygen reduction reaction(ORR) CO_(2)tolerance chlorine doping