A5100421811- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Metal and Thin Film Mechanics
- Laser-Plasma Interactions and Diagnostics
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Diamond and Carbon-based Materials Research
- Boron and Carbon Nanomaterials Research
- Advanced materials and composites
- GaN-based semiconductor devices and materials
- Semiconductor materials and devices
- Carbon Nanotubes in Composites
- Tribology and Wear Analysis
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Cavitation Phenomena in Pumps
- Advanced Machining and Optimization Techniques
- Synthesis and Properties of Aromatic Compounds
- Metal Alloys Wear and Properties
- Microstructure and mechanical properties
- High-Velocity Impact and Material Behavior
- Energetic Materials and Combustion
- Advanced ceramic materials synthesis
- High-pressure geophysics and materials
- Advanced Surface Polishing Techniques
Nanjing University of Science and Technology
2024
Liaoning University of Technology
2017-2023
Argonne National Laboratory
2022-2023
China University of Geosciences (Beijing)
2022-2023
Xuzhou Construction Machinery Group (China)
2018
Beihang University
2017
Xinjiang Institute of Engineering
2017
Taiyuan University of Technology
2013-2014
Zhejiang Sci-Tech University
2012
National University of Singapore
2005
Abstract The multiple acceleration–recombination process in high-order harmonic generation (HHG) has been investigated and discussed. Generally, the HHG can be explained through ionization–acceleration–recombination each half-cycle waveform of laser field. In this article, control via two-colour frequency-chirping field, free electron a specific “W” structure found, which will lead to larger emitted photon energies. Moreover, with optimization by changing frequency chirps, carrier envelope...
An effective scheme to extend the harmonic cutoff and enhance yield from ion by using nano-plasmonic-pump-probe technology has been proposed. The essence of present is use pump pulse steer multi-photon-resonance-ionization region, where ionization probability can be remarkably enhanced. Then, a sequential probe with proper delay time yield. Furthermore, properly choosing injected position adding controlling pulse, single emission event broader plateau obtained. Finally, Fourier...
Two high-pressure stable phases (I41/a-CeN4 and R3̅m-CeN6) two metastable (P6mm-CeN14 P6mm-CeN17) were proposed in Ce–N compounds at 150–300 GPa. The polymeric nitrogen units include quadruple helical chains, N6 rings, first reported layered molecular sieves structures. I41/a-CeN4 can be quenched to ambient conditions its thermal stability maintained up 500 K. P6mm-CeN14 is dynamically mechanically pressure. electronic properties analyses show that charge transfer between the Ce N atoms...
The evolution mechanisms of phase, microstructure and vacuum tribological properties for Ti–20Zr-6.5Al–4V under different laser beam diameters have been investigated by using surface nitriding (LSN). Results indicate that all the LSN samples are mainly composed α phase Ti(Zr)N besides, Ti(Zr)N0.3 can also be obtained, which is based on a change in ratio liquefied nTi(Zr)/nN. With diameter decreasing from 3 to 1 mm, thickness density nitride layer increase significantly, contribute increased...
A larger harmonic cutoff with a higher yield is necessary requirement for producing intense ultrashort extreme ultraviolet (XUV) and X-ray sources. In this paper, we present potential method to improve the from superposition of initial states in He atom driven by low-intensity homogeneous inhomogeneous combined field. The results can be separated into two parts, that is, (i) extension via optimization three-color field (covering carrier envelope phase, delay time, intensity ratio, effect);...
Based on the three-step model of high harmonic generation, we propose a scheme to improve spectra and produce intense water window attosecond pulses. It is found that, firstly, by introducing single chirp two chirps modulations, instantaneous frequency falling part laser field decreased. As result, electron can obtain larger energy during acceleration-recombination process, showing broad plateau in region. Secondly, properly adding third controlling IR or UV pulse, ionization process be...
Titanium nitride is a material of interest for many superconducting devices such as nanowire microwave resonators and photon detectors. Thus, controlling the growth TiN thin films with desirable properties high importance. This work aims to explore effects in ion beam-assisted sputtering (IBAS), were an observed increase nominal critical temperature upper fields are tandem previous on Niobium (NbN). We grow titanium by both, conventional method DC reactive magnetron IBAS method, compare...
The Ag-N system is enriched by proposing four polymeric structures in first-principles calculations at high-pressure. proposedP-1-AgN2andP21/c-AgN2not only break the new record configuration of MN2compound, but also energy density. In MN2stoichiometric ratio, infinite armchair-antiarmchair chain and layered polymer structure are reported for first time inP-1-AgN2andP21/c-AgN2, indicating that highly polymerized can be formed nitrides with low nitrogen content high pressure. mechanism...
High-order harmonic spectra and attosecond pulse generation from Rydberg atom (He[Formula: see text]) driven by the spatially inhomogeneous field have been theoretically investigated. (i) Firstly, with an electron initially in a single excited state (nth), yield can be enhanced due to decreased ionization potential, maximum enhancement obtained when initial is prepared as third (n = 3). However, low cutoff energy unbeneficial of higher photon pulse. Thus, further introduction laser chirp,...
Molecular high-order harmonic generation (MHHG) from in the bowtie-shaped nanostructure has been investigated. The results show that (i) due to surface plasmon polaritons nanostructure, laser intensity can be enhanced and present nonhomogeneous effect space. As a result, extension of cutoff achieved when position is injected away gap center nanostructure. However, limited size inherent threshold value found. (ii) Due asymmetric enhancement space, extended higher harmonics come E(t) > 0 or <...
The generation of the high-order harmonic and attosecond pulse from He atom driven by near-infrared (NIR) field combined with XUV has been theoretically investigated solving three-dimensional time-dependent Schrödinger equation. results show that properly adding into NIR field, (i) not only yield is enhanced, caused laser-induced excited state effect; but also multi-cutoff extension harmonics can be found, absorption extra photons during its recombination process. (ii) With introduction...
High-order harmonic spectra and attosecond source generation from Ar atom driven by the inhomogeneous laser field in frequency space have been theoretically investigated. The results showed that (i) for case of modulation laser, cutoff can be remarkably extended with introduction chirp field, (ii) further using positive spatial (iii) properly adding a terahertz controlling intensity yield enhanced 2 orders magnitude, showing 775[Formula: see text]eV supercontinuum. As result, five isolated...
Abstract Since the millennium, incremental breakthroughs in aerospace have attracted widespread attention from countries around world on deep space exploration. Technological innovations ceramic and superhard materials also played a key role Inspired by this, tribological ball-disk experiment of polycrystalline cubic boron nitride (PcBN) sliding against aluminum oxide (Al2O3) was implemented air vacuum conditions, order to evaluate friction wear properties PcBN based drilling environment....
Titanium coatings are widely used to improve surface hardness and wear resistance of the substrate. Self-propagatinghigh-temperaturesynthesis (SHS) Vacuum-Expendable Pattern Casting (V-EPC) were develop titanium carbide in this paper. The present work attempts explore tribology behaviour coating deposited on steel. Wear tests carried a pin-on-disc tester under different loads sliding speed. mechanism for speeds addressed
Abstract It is pivotal to predict the multiaxial vibration fatigue life during mechanical structural dynamics design. An algorithm of finite element method implementation for high cycle evaluation proposed, on basis elastic evolution model continuum damage mechanics. By considering dynamic characteristics, namely, resonant frequencies and mode shapes, this includes a modal analysis harmonic analysis, which makes different from existing prediction methods. A 10% decrease in frequency regarded...
An efficient method of producing KeV single-attosecond pulses (SAPs) is proposed and investigated through the combination a multi-cycle two-color mid-infrared field few-cycle near-infrared in metal nanostructure. It found that by properly controlling carrier envelope phases (CEPs) delay time three-color field, not only can quantum path harmonic emission be controlled, but yield also enhanced 2 orders magnitude, leading to high-intensity supercontinuum with contribution from one event....
The helicity of encapsulated single, double, and triple helical iodine chains inside single-walled silicon carbide nanotubes is studied using the van der Waals interaction potential density functional theory (DFT). Our results show that optimal radius chain increases linearly with tube radius, which produces a constant separation between wall. angle cannot be determined single chain, due to absence inter-chain interaction. For double chains, small can induced by large for same tubes or...