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The Mexican hat effect on the delamination buckling of a compressed thin film

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Acta Mechanica Sinica 2014年第6期30卷 927-932页

作者： Yin Zhang yun liu State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences Faculty of Information and Automation Kunming University of Science and Technology

Because of the interaction between film and substrate,the film buckling stress can vary significantly,depending on the delamination geometry,the film and substrate mechanical *** Mexican hat effect indicates such *** analytical method is presented,and related dimensional analysis shows that a single dimensionless parameter can effectively evaluate the effect.

关键词： Buckling Delamination Elastic foundation Thin film Compliant substrate

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洛氏硬度现场检测与实验室检测对比

物理测试 2018年第1期36卷 42-45页

作者：刘云霞刘晓强赵鑫赵乃胜周志超北京首钢股份有限公司质量检验部河北迁安064400 北京首钢股份有限公司硅钢事业部河北迁安064400

针对洛氏硬度现场检测与实验室检测存在差异的问题，进行了大量试验。对试验结果进行统计分析，总结和探讨各因素对洛氏硬度试验结果的影响。通过试验得出，试样尺寸过大难以保证检测面的平直度是导致产品硬度测量值偏高的主要原因，对... 详细信息

针对洛氏硬度现场检测与实验室检测存在差异的问题，进行了大量试验。对试验结果进行统计分析，总结和探讨各因素对洛氏硬度试验结果的影响。通过试验得出，试样尺寸过大难以保证检测面的平直度是导致产品硬度测量值偏高的主要原因，对于粗糙度已经达标的板材试样进行打磨处理对试验数据影响不大。因此在制备洛氏硬度试样时，应选取适当尺寸以保证试样平直度。

关键词：洛氏硬度现场检测实验室检测平直度粗糙度

Quantum Chemistry Calculation of Quercetin-silver Complex

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Chinese Journal of Structural Chemistry 2005年第11期24卷 1340-1346页

作者： JIANG liu-yun liu Yu-Ming Analytical and Testing Center of Sichuan University Chengdu 610064 China

Three possible molecular structures of quercetin-silver complexes obtained from the reaction of quercetin and Ag^＋ in equivalent molar ratio were designed and optimized by using Gaussian 98 program at the B3LYP/LanL2DZ basis set. Through theoretical analysis, one of the three designed structures is discovered to have the most stable coordination position. Then its geometry structure, natural bond orbital analyses, vibrational frequency and biological activity were performed. The results show that it has good stability and relatively stronger antioxidative activity because it is favorably attacked by O2^-. Therefore theoretical foundation is provided for the development of new quercetin metal complexes with higher activity antioxidants.

关键词： quercetin,silver-complex quantum chemistry

取代基对IDICR系列分子激发态性质的影响

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原子与分子物理学报 2025年第4期42卷 15-19页

作者：陈舒文昝凤娇王镛涵刘国魁韦瑶瑶李云志周广丽冷霞夏其英临沂大学化学化工学院临沂276000

有机太阳能电池中受体材料的研究是当今热门研究方向之一,其中非富勒烯受体材料因具有良好的平面性以及较强的分子内电荷转移效应,在近年来受到了更为广泛的关注.IDICR系列分子为一种新型的非富勒烯受体,通过改变它的分子结构可以达到... 详细信息

有机太阳能电池中受体材料的研究是当今热门研究方向之一,其中非富勒烯受体材料因具有良好的平面性以及较强的分子内电荷转移效应,在近年来受到了更为广泛的关注.IDICR系列分子为一种新型的非富勒烯受体,通过改变它的分子结构可以达到使其具有更高效能的目的,本文构建IDICR、IDIC1和eh-IDTBR分子,用密度泛函理论(DFT)和含时密度泛函理论(TDDFT)方法计算了三种分子的基态和激发态性质,发现取代基改变会引起附近原子间键长发生变化,最低激发态的能量值以及激发态主要发生的跃迁类型也发生了改变,并且随着溶剂的极性增大,分子的最高吸收峰会发生红移.

关键词：有机太阳能电池激发态非富勒烯受体

Entanglement Dynamics and Bell Violations of Two Atoms in Tavis-Cummings Model with Phase Decoherence

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Communications in Theoretical Physics 2008年第6期49卷 1505-1514页

作者： SHAN Chuan-Jia CHENG Wei-Wen liu Tang-Kun GUO De-Jun xia yun-Jie Department of Physics Hubei Normal University Huangshi 435002 China Department of Physics Qufu Normal University Qufu 273165 China

Considering the dipole-dipole coupling intensity between two atoms and the field in the Fock state, the entanglement dynamics between two atoms that are initially entangled in the system of two two-level atoms coupled to a single mode cavity in the presence of phase decoherence has been investigated. The two-atom entanglement appears with periodicity without considering phase decoherence, however, the phase decoherence causes the decay of entanglement between two atoms, with the increasing of the phase decoherence coefficient, the entanglement will quickly become a constant value, which is affected by the two-atom initial state. Meanwhile the two-atom quantum state will forever stay in the maximal entangled state when the initial state is proper even in the presence of phase decoherence. On the other hand, the Bell violation and the entanglement do not satisfy the monotonous relation, a large Bell violation implies the presence of a large amount of entanglement under certain conditions, while a large Bell violation corresponds to a little amount of entanglement in certain situations. However, the violation of Bell-CHSH inequality can reach the maximal value if two atoms are in the maximal entangled state, or vice versa.

关键词： entanglement dynamics stable entanglement phase decoherence

Riemann-Hilbert problems and N-soliton solutions of the nonlocal reverse space-time Chen-Lee-liu equation

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Communications in Theoretical Physics 2023年第3期75卷 12-19页

作者： Tongshuai liu Tiecheng xia Department of Mathematics Shanghai UniversityShanghai200444China

In this paper,the N-soliton solutions to the nonlocal reverse space-time Chen-Lee-liu equation have been *** the nonlocal symmetry reduction to the matrix spectral problem,the nonlocal reverse space-time Chen-Lee-liu equation can be *** on the spectral problem,the specific matrix Riemann-Hilbert problem is constructed for this nonlocal *** solving this associated Riemann-Hilbert problem,the N-soliton solutions to this nonlocal equation can be obtained in the case of the jump matrix as an identity matrix.

关键词： Riemann-Hilbert problem nonlocal reverse space-time Chen-Lee-liu equation N-soliton solution

Galvanic Corrosion Behavior of Copper-Drawn Steel for Grounding Grids in the Acidic Red Soil Simulated Solution

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Acta Metallurgica Sinica(English Letters) 2020年第11期33卷 1571-1582页

作者： xiao-Lei Fan yun-xiang Chen Jun-Xi Zhang De-Yuan Lin Xuan-Xuan liu xiao-Jian xia Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power Shanghai University of Electric PowerShanghai 200090China Electric Power Research Institute of State Grid Fujian Electric Power Company Limited Fuzhou 350007China

The influence of pH and metallographic structure on the corrosion behavior of copper-drawn steel is studied with the simulated *** effect of pH on the corrosion behavior of copper-drawn steel has been investigated using open-circuit potential,potentiodynamic polarization,galvanic current measurement,scanning electron microscopy and scanning vibrating electrode technique *** steel is corroded as anode,while the corrosion of copper plate is protected as *** the results revealed that pH and metallographic structure had a significant influence on the corrosion behavior of copper-drawn *** the decrease in pH value from 6 to 2.4,the corrosion rate of copper-drawn steel galvanic couple(Cu-Fe GC)obviously increased in the simulated solution of acidic red *** electric field formed by the Cu-Fe GC changes the direction of ion migration between the copper and drawn steel electrodes,which impacts the composition and microstructure of corrosion products formed on the electrode surface.

关键词： Cu-Fe galvanic couple Electrochemical test Scanning vibrating electrode technique(SVET)measurement Soil corrosion

Boundedness of some integral operators and commutators on homogeneous Herz spaces with three variable exponents

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Frontiers of Mathematics in China 2021年第1期16卷 211-237页

作者： xia YU Zongguang liu School of Sciences China University of Mining and TechnologyBeijing 100083China

We obtain the boundedness of some integral operators and commutators on homogeneous Herz spaces with three variable exponents K^(˙α(⋅))_(p(⋅),q(⋅)),such as some sublinear operators,the fractional integral and its co... 详细信息

关键词： Sublinear operator fractional integral commutator homogeneous Herz space variable exponent

Investigate the Wake Flow on Houseflies with Particle-Tracking-Velocimetry and Schlieren Photography

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Journal of Bionic Engineering 2023年第2期20卷 656-667页

作者： yun liu Angel David Lozano Department of Mechanical and Civil Engineering Purdue University NorthwestWestvilleIN46323USA

Utilizing high-speed schlieren photography and particle-tracking-velocimetry,the wake flow of tethered houseflies is *** high-speed schlieren photography is implemented on tethered houseflies inside an air container with a stable vertical temperature gradient to visualize the disturbed wake flow from the *** resulting photography images were then processed with the physics based optical flow method to derive the light-path averaged flow ***,the state of the art:Shake-the-Box system is implemented on a tethered housefly to measure the volumetric flow field in the wake of the insect,revealing interesting flow behavior and structures that can also be observed and correlated to the schlieren photography *** the dimensionless velocity magnitude of the wake flow from the two experiments,a good qualitative agreement is reached,suggesting the viability of high-speed schlieren photography in investigating the wake flow of small ***,the high-speed schlieren photography is successfully applied on a housefly that is taking off from the ground,visualizing the disturbed wake flow on the freely flying insect that is challenging to visualize with other methods.

关键词： Insect flight Schlieren photography Shake-the-Box Wake flow