- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Graphene Foam: Hole-Flake Network for Uniaxial Supercompression and Recovery Behavior
摘要： We employed the coarse-grained molecular dynamics simulation method to systematically study the uniaxial supercompression and recovery behavior of multi-porous graphene foam, in which a mesoscopic three-dimensional network with hole-graphene flakes was proposed. The network model not only considers the physical cross-links and interlayer van der Waals interactions, but also introduces a hole in the flake to approach the imperfection of pristine graphene and the hierarchical porous configuration of real foam material. We first recreated a typical two-stage supercompression stress?strain relationship and the corresponding time-dependent recovery as well as a U-type nominal Poisson ratio. Then the recovery unloading at different strains and multicycle compression?uncompression were both conducted; the initial elastic moduli in the multicycles were found to be the same, and a multilevel residual strain was disclosed. Importantly, the residual strain is not exactly the plastic one, part of which can resurrect in the subsequent loading?unloading?holding. The mesoscopic mechanism of viscoelastic and residual deformation for the recovery can be attributed to the van der Waals repulsion and mechanical interlocking among the hole-flakes; interestingly, the local tensile stress was observed in the virial stress distribution. Particularly, an abnormal turning point in the length-time curve for the mean bead-bond length was captured during the supercompression. After the point, the length abnormally increases for different size ratios of the hole to the flake, which is in line with the mesostructure evolution. The finding may provide a mesoscopic criterion for the supercompression of graphene foam related materials.
关键词： supercompression,strain history,recovery behavior,mesoscale,van der Waals interaction,viscoelastoplasticity,graphene foam,coarse-grained molecular dynamics
更新于2025-09-23 15:21:01
-
[IEEE 2018 International Conference Laser Optics (ICLO) - St. Petersburg (2018.6.4-2018.6.8)] 2018 International Conference Laser Optics (ICLO) - Compact CPA Laser System Based on Yb Fiber Seeder and Yb:YAG Amplifier
摘要： A coarse-grained reconfigurable processing unit (RPU) consisting of multi-functional processing elements (PEs) interconnected by an area-efficient line-switched mesh connect (LSMC) routing is implemented on a die in TSMC 65 nm LP1P8M CMOS technology. A hierarchical configuration context (HCC) organization scheme is proposed to reduce the implementation overhead and the energy dissipation spent on fast reconfiguration. The proposed RPU is integrated into two system-on-a-chips (SoCs), targeting multiple-standard video decoding. The high-performance chip, comprising two RPU processors (named REMUS_HPP), can decode H.264 video streams at 30 frames per second (fps) under 200 MHz. REMUS_HPP achieves a 25% performance gain over the XPP-III reconfigurable processor with only 280 mW power consumption, resulting in a improvement on energy efficiency. The other chip (named REMUS_LPP), targeting low power applications, integrates only one RPU processor. REMUS_LPP can decode H.264 video streams at 35fps with 24.5 mW under 75 MHz, achieving a 76% reduction in power dissipation and improvement on energy efficiency compared with the ADRES reconfigurable processor.
关键词： reconfigurable computing,video decoding,Coarse-grained reconfigurable array
更新于2025-09-23 15:19:57
-
[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Improved Maximum Power Point Tracking of Partially Shaded PV Arrays Using Particle Swarm Optimization with Zone Initialization
摘要： A coarse-grained reconfigurable processing unit (RPU) consisting of multi-functional processing elements (PEs) interconnected by an area-efficient line-switched mesh connect (LSMC) routing is implemented on a die in TSMC 65 nm LP1P8M CMOS technology. A hierarchical configuration context (HCC) organization scheme is proposed to reduce the implementation overhead and the energy dissipation spent on fast reconfiguration. The proposed RPU is integrated into two system-on-a-chips (SoCs), targeting multiple-standard video decoding. The high-performance chip, comprising two RPU processors (named REMUS_HPP), can decode H.264 video streams at 30 frames per second (fps) under 200 MHz. REMUS_HPP achieves a 25% performance gain over the XPP-III reconfigurable processor with only 280 mW power consumption, resulting in a improvement on energy efficiency. The other chip (named REMUS_LPP), targeting low power applications, integrates only one RPU processor. REMUS_LPP can decode H.264 video streams at 35fps with 24.5 mW under 75 MHz, achieving a 76% reduction in power dissipation and improvement on energy efficiency compared with the ADRES reconfigurable processor.
关键词： reconfigurable computing,video decoding,Coarse-grained reconfigurable array
更新于2025-09-23 15:19:57
-
[Methods in Enzymology] Intrinsically Disordered Proteins Volume 611 || Accurate Transfer Efficiencies, Distance Distributions, and Ensembles of Unfolded and Intrinsically Disordered Proteins From Single-Molecule FRET
摘要： Intrinsically disordered proteins (IDPs) sample structurally diverse ensembles. Characterizing the underlying distributions of conformations is a key step toward understanding the structural and functional properties of IDPs. One increasingly popular method for obtaining quantitative information on intramolecular distances and distributions is single-molecule F?rster resonance energy transfer (FRET). Here we describe two essential elements of the quantitative analysis of single-molecule FRET data of IDPs: the sample-specific calibration of the single-molecule instrument that is required for determining accurate transfer efficiencies, and the use of state-of-the-art methods for inferring accurate distance distributions from these transfer efficiencies. First, we illustrate how to quantify the correction factors for instrument calibration with alternating donor and acceptor excitation measurements of labeled samples spanning a wide range of transfer efficiencies. Second, we show how to infer distance distributions based on suitably parameterized simple polymer models, and how to obtain conformational ensembles from Bayesian reweighting of molecular simulations or from parameter optimization in simplified coarse-grained models.
关键词： Intrinsically disordered proteins,Coarse-grained models,Conformational ensembles,Polymer models,Single-molecule FRET,Distance distributions,Bayesian inference
更新于2025-09-10 09:29:36
-
Two-dimensional Monte Carlo simulations of coarse-grained poly(3-hexylthiophene) (P3HT) adsorbed on striped substrates
摘要： We investigate the structural phases of single poly(3-hexylthiophene) (P3HT) polymers that are adsorbed on a two-dimensional substrate with a striped pattern. We use a coarse-grained representation of the polymer and sophisticated Monte Carlo techniques such as a parallelized replica exchange scheme and local as well as non-local updates to the polymer’s configuration. From peaks in the canonically derived observables, it is possible to obtain structural phase diagrams for varying substrate parameters. We find that the shape of the stripe pattern has a substantial effect on the obtained configurations of the polymer and can be tailored to promote either more stretched out or more compact configurations. In the compact phases, we observe different structural motifs, such as hairpins, double-hairpins, and interlocking “zipper” states.
关键词： coarse-grained,striped substrates,Monte Carlo simulations,poly(3-hexylthiophene),P3HT,structural phases
更新于2025-09-10 09:29:36