Dongfeng Qi
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View article: Shear Behavior of Curved Concrete Structures Repaired with Sustainability-Oriented Trenchless Polymer Grouting
Shear Behavior of Curved Concrete Structures Repaired with Sustainability-Oriented Trenchless Polymer Grouting Open
Urban underground infrastructure is increasingly challenged by material aging, environmental degradation, and structural deterioration. In response, trenchless polymer grouting technologies employing sustainability-oriented two-component f…
View article: Enhancing optical integration: One-step fabrication of multilevel and bifocal Fresnel diffractive microlenses with high focusing efficiency via two-photon polymerization
Enhancing optical integration: One-step fabrication of multilevel and bifocal Fresnel diffractive microlenses with high focusing efficiency via two-photon polymerization Open
View article: Analysis of the Influence of Bearing Plate Position on the Uplift Bearing Capacity of Low-Header CEP Single-Pile Foundations
Analysis of the Influence of Bearing Plate Position on the Uplift Bearing Capacity of Low-Header CEP Single-Pile Foundations Open
This study investigates the impact of the bearing plate position on the uplift bearing capacity of low-header concrete expanded pile (CEP) foundations using the ANSYS finite element simulation method. Nine models of low-header CEP single p…
View article: Scaffolds fabricated via two-photon polymerisation for regulating cell morphology and differentiation
Scaffolds fabricated via two-photon polymerisation for regulating cell morphology and differentiation Open
Three-dimensional (3D) cell culture scaffolds play a key role in guiding cell fate. The fine-tunability of these scaffolds is essential for accurately replicating in vivo conditions and revealing cellular behaviours. In this study, two-pho…
View article: AI-integrated wearable strain sensors: advances in e-skin, robotics, and personalized health monitoring
AI-integrated wearable strain sensors: advances in e-skin, robotics, and personalized health monitoring Open
Flexible, skin-like wearable sensor (e-skin) for health monitoring dashboard ( e.g. , heart rate, muscle activity, motion tracking) neural network nodes, medical, robotics, sports/fitness.
View article: Design and fabrication of microfluidic device used for concentration screening of targeted-drugs
Design and fabrication of microfluidic device used for concentration screening of targeted-drugs Open
View article: Facile fabrication of THz metasurfaces by a spatially shaped femtosecond laser printing system
Facile fabrication of THz metasurfaces by a spatially shaped femtosecond laser printing system Open
Terahertz (THz) metasurfaces provide unprecedented abilities to realize versatile THz wavefronts manipulations. Nevertheless, these high degree of freedom, non-periodic, densely arranged subwavelength unit cells pose numerous extreme param…
View article: Investigation into fabrication and optical characteristics of tunable optofluidic microlenses using two-photon polymerization
Investigation into fabrication and optical characteristics of tunable optofluidic microlenses using two-photon polymerization Open
Optofluidic systems, integrating microfluidic and micro-optical technologies, have emerged as transformative tools for various applications, from molecular detection to flow cytometry. However, existing optofluidic microlenses often rely o…
View article: Feasibility of simultaneous multi-element analysis of quartz sand with impurities by calibration-free laser-induced breakdown spectroscopy and its potential for guiding glass manufacturing
Feasibility of simultaneous multi-element analysis of quartz sand with impurities by calibration-free laser-induced breakdown spectroscopy and its potential for guiding glass manufacturing Open
As the main raw material in glass manufacturing, quartz sand and its elementary contents play an important role in glass quality. As raw quartz sand contains a variety of impurities such as metal oxides, which makes traditional chemical an…
View article: Effect of Laser Pulse Width and Intensity Distribution on the Crystallographic Characteristics of GeSn Film
Effect of Laser Pulse Width and Intensity Distribution on the Crystallographic Characteristics of GeSn Film Open
Germanium-tin (GeSn) alloy is considered a promising candidate for a Si-based short-wavelength infrared range (SWIR) detector and laser source due to its excellent carrier mobility and bandgap tunability. Pulsed laser annealing (PLA) is on…
View article: Study on the Periodic Structure of Polycrystalline Gesn Prepared by Femtosecond Pulse Laser Direct Writing
Study on the Periodic Structure of Polycrystalline Gesn Prepared by Femtosecond Pulse Laser Direct Writing Open
View article: Charging Station Planning of Electric Vehicle in Battery Swapping Scene
Charging Station Planning of Electric Vehicle in Battery Swapping Scene Open
In response to the national green development concept, the electric vehicles quantity continues to surge. However, the cost of electric vehicle charging facilities is hindering the development of electric vehicles. Considering charging fac…
View article: Spatially modulated femtosecond laser direct ablation-based preparation of ultra-flexible multifunctional copper mesh electrodes and its application
Spatially modulated femtosecond laser direct ablation-based preparation of ultra-flexible multifunctional copper mesh electrodes and its application Open
Multifunctional electrodes possess superior properties such as high photoelectric properties and high stability. Laser manufacturing process is one of the widely used method for electrode fabrication. However, the current multifunctional e…
View article: Near-Interface Defects in Graphene/H-BN In-Plane Heterostructures: Insights into the Interfacial Thermal Transport
Near-Interface Defects in Graphene/H-BN In-Plane Heterostructures: Insights into the Interfacial Thermal Transport Open
Based on nonequilibrium molecular dynamics (NEMD) and nonequilibrium Green’s function simulations, the interfacial thermal conductance (ITC) of graphene/h-BN in-plane heterostructures with near-interface defects (monovacancy defects, 585 a…
View article: Temporal-Spatial Measurement of Surface Morphological Evolution Time in Nanosecond Laser Irradiation on the Copper Film
Temporal-Spatial Measurement of Surface Morphological Evolution Time in Nanosecond Laser Irradiation on the Copper Film Open
In this research, the pump-probe imaging technology and the time-resolved transmittance measurements are used to investigate the transient time scale of the oxidation area, the dewetted melt pool, and the ablation-induced mass transport, a…
View article: On the use of Extended Finite Element Method (XFEM) for jointed rock slope problems
On the use of Extended Finite Element Method (XFEM) for jointed rock slope problems Open
Finite element method as an advanced numerical technique has been used widely for modeling jointed rock mass, where both joint and intact rock would be modeled explicitly. One of the major challenges that is associated with this approach i…
View article: Transient Study of Femtosecond Laser–Induced Ge2Sb2Te5 Phase Change Film Morphology
Transient Study of Femtosecond Laser–Induced Ge2Sb2Te5 Phase Change Film Morphology Open
Femtosecond laser-induced crystallization and ablation of Ge2Sb2Te5 (GST) phase change film is investigated by reflectivity pump-probing technology. Below the ablation threshold, the face-centered cubic structure (FCC) state in the central…
View article: Fabrication of flexible transparent Ag square-shaped mesh electrode by top-flat nanosecond laser ablation
Fabrication of flexible transparent Ag square-shaped mesh electrode by top-flat nanosecond laser ablation Open
We report a facile top-flat square nanosecond (ns) laser direct writing ablation technique in a thin silver film substrate to fabricate the silver square-shaped cell structure of flexible transparent electrodes. Square silver cell structur…
View article: Progress in preparation and applications of Te-As-Se chalcogenide glasses and fibers
Progress in preparation and applications of Te-As-Se chalcogenide glasses and fibers Open
View article: In situ and ex-situ physical scenario of the femtosecond laser-induced periodic surface structures
In situ and ex-situ physical scenario of the femtosecond laser-induced periodic surface structures Open
Laser-induced periodic surface structures (LIPSS) are a universal phenomenon that can allow tailoring nanoelectronics and nanophotonics devices. However, there is an issue about the formation mechanism of LIPSS, and the current research ma…
View article: In-Situ and Ex-Situ Characterization of Femtosecond Laser-Induced Ablation on As2S3 Chalcogenide Glasses and Advanced Grating Structures Fabrication
In-Situ and Ex-Situ Characterization of Femtosecond Laser-Induced Ablation on As2S3 Chalcogenide Glasses and Advanced Grating Structures Fabrication Open
Femtosecond laser pulse of 800 nm wavelength and 150 fs temporal width ablation of As2S3 chalcogenide glasses is investigated by pump-probing technology. At lower laser fluence (8.26 mJ/cm2), the surface temperature dropping to the melting…
View article: Enhanced indirect-to-direct inter-valley scattering in germanium under tensile strain for improving the population of electrons in direct valley
Enhanced indirect-to-direct inter-valley scattering in germanium under tensile strain for improving the population of electrons in direct valley Open
A theoretical model is proposed to analyze the inter-valley electron transferring between direct Γ and indirect L valleys, which sheds light on the electron conduction dynamics in (0 0 1) tensile strained Ge. Inter-valley scattering is inc…
View article: Suppression for an intermediate phase in ZnSb films by NiO-doping
Suppression for an intermediate phase in ZnSb films by NiO-doping Open
View article: Controlling Mn Depth Profiles in GaMnAs During High-Temperature Molecular Beam Epitaxial Growth
Controlling Mn Depth Profiles in GaMnAs During High-Temperature Molecular Beam Epitaxial Growth Open
Mn-doped GaAs thin films were grown at a high substrate temperature of 580 C. During the growth process, the Mn cell temperature was ramped at different rates, resulting in a variety of different Mn concentration depth profile slopes, as m…
View article: Atomic Control of Strain in Freestanding Graphene
Atomic Control of Strain in Freestanding Graphene Open
In this study, we describe a new experimental approach based on constant-current scanning tunneling spectroscopy to controllably and reversibly pull freestanding graphene membranes up to 35 nm from their equilibrium height. In addition, we…
View article: High-Percentage Success Method for Preparing and Pre-Evaluating Tungsten Tips for Atomic-Resolution Scanning Tunneling Microscopy
High-Percentage Success Method for Preparing and Pre-Evaluating Tungsten Tips for Atomic-Resolution Scanning Tunneling Microscopy Open
A custom double-lamella method is presented for electrochemically etching tungsten wire for use as tips in scanning tunneling microscopy (STM). For comparison, tips were also manufactured in-house using numerous conventional methods and ex…
View article: A Pathway between Bernal and Rhombohedral Stacked Graphene Layers with Scanning Tunneling Microscopy
A Pathway between Bernal and Rhombohedral Stacked Graphene Layers with Scanning Tunneling Microscopy Open
Horizontal shifts in the top layer of highly oriented pyrolytic graphite, induced by a scanning tunneling microscope (STM) tip, are presented. Excellent agreement is found between STM images and those simulated using density functional the…
View article: New Scanning Tunneling Microscopy Technique Enables Systematic Study of the Unique Electronic Transition from Graphite to Graphene
New Scanning Tunneling Microscopy Technique Enables Systematic Study of the Unique Electronic Transition from Graphite to Graphene Open
A series of measurements using a novel technique called electrostatic-manipulation scanning tunneling microscopy were performed on a highly-oriented pyrolytic graphite (HOPG) surface. The electrostatic interaction between the STM tip and t…
View article: Atomic-Scale Movement Induced in Nano-Ridges by Scanning Tunneling Microscopy on Epitaxial Graphene Grown on 4H-SiC(0001)
Atomic-Scale Movement Induced in Nano-Ridges by Scanning Tunneling Microscopy on Epitaxial Graphene Grown on 4H-SiC(0001) Open
Nanoscale ridges in epitaxial multilayer graphene grown on the silicon face of 4 degree off-cut 4H-SiC (0001) were found using scanning tunneling microscopy (STM). These nano-ridges are only 0.1 nm high and 25-50 nm wide, making them much …