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On Optical Polarons in One Dimensional Molecular-Crystal Chains

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Chinese Physics Letters 1996年第8期13卷 617-620页

作者： chen Hao chen yuan Department of Physics South China Normal UniversityGuangzhou 510631

An improved solution for the optical polarons in the molecular-crystal model with the dispersion term in one dimensional chains is *** approximation neglecting the dispersion term,the improved solution tends to usual ... 详细信息

关键词： solution dispersion polaron

Path-Dependent Progressive Failure Analysis for 3D-Printed Continuous Carbon Fibre Reinforced Composites

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Chinese Journal of Mechanical Engineering 2024年第4期37卷 84-93页

作者： yuan chen Lin Ye School of System Design and Intelligent Manufacturing(SDIM) Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Intelligent Manufacturing for Continuous Carbon Fibre Reinforced Composites Southern University of Science and TechnologyShenzhen 518055China

In order to predict the damage behaviours of 3D-printed continuous carbon fibre(CCF)reinforced composites,when additional short carbon fibre(SCF)composite components are employed for continuous printing or special functionality,a novel path-dependent progressive failure(PDPF)numerical approach is ***,a progressive failure model using Hashin failure criteria with continuum damage mechanics to account for the damage initiation and evaluation of 3D-printed CCF reinforced polyamide(PA)composites is developed,based on actual fibre placement trajectories with physical measurements of 3D-printed CCF/PA ***,an elastic-plastic model is employed to predict the plastic damage behaviours of SCF/PA ***,the accuracy of the PDPF model was validated so as to study 3D-printed CCF/PA composites with either negative Poisson's ratio or high *** results demonstrate that the proposed PDPF model can achieve higher prediction accuracies in mechanical properties of these 3D-printed CCF/PA *** analyses show that the stress distribution is generally aggregated in the CCF areas along the fibre placement paths,and the shear damage and matrix tensile/compressive damage are the key damage *** study provides a new approach with valuable information for characterising complex 3D-printed continuous fibre-matrix composites with variable mechanical properties and multiple constituents.

关键词： 3D printing Continuous carbon fibre Modelling Energy absorption Negative Poisson's ratio

Module-relative-Hochschild （co）homology of tensor products

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Frontiers of Mathematics in China 2012年第3期7卷 415-426页

作者： yuan chen School of Mathematics and Computer Science Hubei UniversityWuhan 430062China School of Mathematical Sciences Beijing Normal UniversityBeijing 100875China

In this paper, we consider the module-relative-Hochschild homology and cohomology of tensor products of algebras and relate them to those of the factor algebras. Moreover, we show that the tensor product is formally s... 详细信息

关键词： Tensor product module-relative-Hochschild (co)homology formalsmoothness

First-principles study on superconductive properties of compressive strain-engineered cryogenic superconducting heavy metal lead(Pb)

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Communications in Theoretical Physics 2021年第3期73卷 156-161页

作者： Qing-yuan chen School of Physical Science and Technology Kunming UniversityKunming650214China

As one of the main materials in the practical *** superconductor,lead(Pb)has been used to manufacture superconducting AC power cable,and some weak current *** the development of manufacturing,technology,more and more researchers focus on exploring the physical and chemical properties of cryogenic superconducting materials,instead of blindly pursuing the improvement of the superconducting transition temperature(T_(c)).In this paper,the structural properties and superconducting transition temperature under high pressure of Pb have been studied by first-principles *** has shown that Pb can withstand the compressive strain up to 10%while the lattice structure remains stable,indicated by the calculations of phonon band *** 0%to 10%compressive strain,there is neither a band-gap nor changing of the band *** of electronic *** the Fermi level leads to a decreasing of T_(c).Our calculations show that Pb is a stable elemental metallic superconductor even under high pressure,which explains the reason why it has been used in practical productions.

关键词： first-principles study superconductive properties strain Pb

Skew Derivations with Power Central Values on Commutators

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Algebra Colloquium 2015年第3期22卷 479-494页

作者： Hung-yuan chen Department of Mathematics National Changhua University of Education Changhua City 500 Taiwan

Let R be a prime ring with center Z, 5 ： R → R a nonzero skew derivation, and n a fixed positive integer. In this paper, we show that R is a commutative ring if （i） [（δ（[x, y]）, [x, y]]n = 0 for all x, y ∈ R ... 详细信息

关键词： automorphism prime ring Martindale quotient ring skew derivation Minner

Landslide and Basin Self-organized Criticality in the Lushan Hot Spring Area

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Journal of Mountain Science 2012年第4期9卷 463-471页

作者： Chien-yuan chen Department of Civil and Water Resources Engineering Taiwan Chiayi University

Defining a basin under a critical state （or a self-organized criticality） that has the potential to initiate landslides, debris flows, and subsequent sediment disasters, is a key issue for disaster prevention. The Lushan Hot Spring area in Nantou County, Taiwan, suffered serious sediment disasters after typhoons Sinlaku and Jangmi in aoo8, and following Typhoon Morakot in 2009. The basin＇s internal slope instability after the typhoons brought rain was examined using the landslide frequency-area distribution. The critical state indices attributed to landslide frequency-area distribution are discussed and the marginally unstable characteristics of the study area indicated. The landslides were interpreted from Spot 5 images before and after disastrous events. The results of the analysis show that the power-law landslide frequency-area curves in the basin for different rainfall-induced events tend to coincide with a single line. The temporal trend of the rainfall- induced landslide frequency-area distribution shows 1If noise and scale invariance. A trend exists for landslide frequency-area distribution in log-log space for larger landslides controlled by the historical maximum accumulated rainfall brought by typhoons. The unstable state of the basin, including landslides, breached dams, and debris flows, are parts of the basin＇s self-organizing processes. The critical state of landslide frequency-area distribution could be estimated by a critical exponent of 1.0. The distribution could be used for future estimation of the potential landslide magnitude for disaster mitigation and to identify the current state of a basin for management.

关键词： Landslide Debris flow Power law Self-organized criticality

Non-tensorial gravitational wave background in NANOGrav 12.5-year data set

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Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 84-89页

作者： Zu-cheng chen chen yuan Qing-Guo Huang CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

We perform the first search for an isotropic non-tensorial gravitational-wave background(GWB) allowed in general metric theories of gravity in the North American Nanohertz Observatory for Gravitational Waves(NANOGrav) 12.5-year data set. By modeling the GWB as a power-law spectrum, we find strong Bayesian indication for a spatially correlated process with scalar transverse(ST) correlations whose Bayes factor versus the spatially uncorrelated common-spectrum process is 107 ± 7, but no statistically significant evidence for the tensor transverse, vector longitudinal, and scalar longitudinal polarization modes. The median and the 90% equal-tail amplitudes of ST mode are ■ , or equivalently the energy density parameter per logarithm frequency is ■, at frequency of 1/year.

关键词： gravitational wave scalar transverse polarization pulsar timing array

Explicit-form complex orthogonal design for space-time block codes

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Science China(Information Sciences) 2013年第6期56卷 15-24页

作者： LI yuan yuan chen KAN HaiBin School of Computer Science Fudan University

In this paper,we present a construction of complex orthogonal design for space-time block codes in any number of *** construction achieves both the maximal rate and minimal *** far as we know,our construction is the first explicit-form construction,which has asymptotically optimal time complexity and space *** new representation of complex orthogonal design might bring advantages in analyzing some *** addition,when the number of antennas n ≡ 1,2,3(mod 4),our construction satisfies transceiver signal linearization property,which allows for design of low complexity channel equalizers and interference suppressing filters.

关键词： space-time block codes complex orthogonal design explicit-form construction maximal rate minimal delay

Nanoelectrochemical architectures for high-spatial-resolution single cell analysis

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Science China Chemistry 2017年第10期60卷 1277-1284页

作者： Junyu Zhou Dechen Jiang Hong-yuan chen State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

The analysis of single cells instead of cell populations is important for characterizing cellular heterogeneity and elucidating the cellular signalling pathways. Nanoelectrodes have emerged as an increasingly important tool for biomolecule analyses at the single-cell level with high spatial or temporal resolution. Various electrochemical methods, such as amperometry and scanning electrochemical microscopy(SECM), have been applied. Research to date has focused on the development of new nanoelectrochemical architectures, such as arrays, to achieve higher spatial resolution and faster analysis rates for single-cell analysis. In this review, the fabrication of these new nanoelectrochemical architectures and their applications in high spatial resolution single-cell analyses are discussed. The recent progress of Chinese researchers is highlighted.

关键词： nanoelectrochemical architectures single-cell analysis high spatial resolution high throughput