Showing papers by "Dalian University of Technology published in 2022"
TL;DR: Antibiotic residues are ubiquitous in wastewater, surface water, and groundwater worldwide with concentrations ranging from 0.1 to 5.5 mM as discussed by the authors, with concentrations varying from 1.5 to 10 mM.
141 citations
TL;DR: In this paper, a comprehensive survey of the most important aspects of multi-sensor applications for human activity recognition, including those recently added to the field for unsupervised learning and transfer learning, is presented.
136 citations
TL;DR: In this paper, NiFe2O4/polypyrrole nanocomposites are prepared by a simple surface-initiated polymerization method and demonstrate negative permittivity in the low frequency regions.
86 citations
TL;DR: In this article , the authors provide a review of peptide-based self-assembly nanostructures, focusing on the driving forces that dominate peptide selfassembly and assembly mechanisms of peptides.
84 citations
01 May 2022
TL;DR: In this article , NiFe2O4/polypyrrole nanocomposites are prepared by a simple surface-initiated polymerization method and demonstrate negative permittivity in the low frequency regions.
Abstract: NiFe2O4/polypyrrole (NiFe2O4/PPy) nanocomposites are prepared by a simple surface-initiated polymerization method and demonstrate negative permittivity in the low frequency regions. These nanocomposites also exhibit significantly enhanced electromagnetic wave (EMW) absorption property in the high frequency regions. Compared with pure PPy, the enhanced negative permittivity is observed in the NiFe2O4/PPy nanocomposites with a NiFe2O4 loading of 5.0, 10.0, 20.0 and 40.0 wt%, indicating the formation of metal-like electrical conducting network in NiFe2O4/PPy nanocomposites. Moreover, the negative permittivity could be tuned by changing the NiFe2O4 loading. The minimum reflection loss (RL) of -40.8 dB is observed in the 40.0 wt% NiFe2O4/PPy composites with a thickness of only 1.9 mm. The effective absorption bandwidth below -10.0 and -20.0 dB reaches 6.08 and 2.08 GHz, respectively. The enhanced EMW absorption performance benefits from the improved independence matching, EMW attenuation capacity, and synergistic effects of conduction loss, dielectric loss (interfacial and dipole polarizations) and magnetic loss (exchange and natural resonances). This research work provides a guidance for the fabrication of nanocomposites with an excellent EMW absorption.
83 citations
TL;DR: In this article, the mass transfer characteristics of water and guest molecules across hydrate shells during their formation from water droplets were investigated using X-ray computed tomography to reveal the transport mechanism in hydrates.
75 citations
TL;DR: In this article , the mass transfer characteristics of water and guest molecules across hydrate shells during their formation from water droplets were investigated using X-ray computed tomography to reveal the transport mechanism in hydrates.
73 citations
TL;DR: In this article, the NiCo-LDH hollow spheres are assembled with frizzy NiCo -LDH nanosheets, where the hollow structure can inhibit agglomeration of the LDH nano-heets to expose more active sites and shorten the diffusion path of electrolyte ions.
59 citations
TL;DR: In this article, a decoupling effort model based on factor decomposition models was constructed to analyze the driving factors of carbon emissions and economic decoupled, which builted a foundation for achieving sustainable economic development.
54 citations
TL;DR: In this paper, an ammonium vanadium oxide framework (NVO) displaying excellent NH4+ storages was reported, and the capacitance and cycle performance of NVO were greatly improved using NH4Cl/PVA gel electrolyte.
51 citations
TL;DR: In this paper, a nonlinear control target is introduced, i.e., to ensure that the vibration amplitude is lower than a threshold value (pre-specified according to the expected structural performance) before a target wind speed.
TL;DR: In this paper, the effect of ultrafine water mist with phosphorus-containing compounds (PCCs) on the flame in CH4/coal dust explosion is experimentally and numerically investigated.
TL;DR: In this article , a photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method, which exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes.
Abstract: A photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method. X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory calculation revealed that S-BiOBr consisted of covalent [Bi2O2S]2+ layer and exchangeable bromide ions [Br2]2-. The specific layered structure of S-BiOBr exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes. Furthermore, the internal electric field enhanced by polarization effects in the [Bi2O2S]2+ layer was conducive to a lasting electron transfer in the dark condition after photoactivation. The electron of R• radical derived from oxidizing [Bi2O2S]-OOC-R persistently migrated to the S-BiOBr surface and was trapped by O2 to form O2•-, facilitating the degradation of CIP in the dark. Hence, the degradation of CIP could be realized by utilizing the R• radical triggered through transient photoinitiation with low optical energy consumption.
TL;DR: In this article, a photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method, which exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes.
Abstract: A photocatalyst of layered structural BiOBr doped with sulfur (S-BiOBr) was synthesized using a facile hydrothermal method. X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and density functional theory calculation revealed that S-BiOBr consisted of covalent [Bi2O2S]2+ layer and exchangeable bromide ions [Br2]2-. The specific layered structure of S-BiOBr exhibited excellent performance for the intercalation, adsorption and photocatalytic degradation of ciprofloxacin (CIP) by forming interlayer [Bi2O2S]2+--OOC-R complexes. Furthermore, the internal electric field enhanced by polarization effects in the [Bi2O2S]2+ layer was conducive to a lasting electron transfer in the dark condition after photoactivation. The electron of R• radical derived from oxidizing [Bi2O2S]-OOC-R persistently migrated to the S-BiOBr surface and was trapped by O2 to form O2•-, facilitating the degradation of CIP in the dark. Hence, the degradation of CIP could be realized by utilizing the R• radical triggered through transient photoinitiation with low optical energy consumption.
TL;DR: The proposed NCCS system has larger key space and exhibits better cryptographic features in dynamics than their original one-dimensional chaotic map, and the validity of the proposed algorithm in terms of high security is shown.
TL;DR: In this paper, the current state-of-the-art in metal additive manufacturing is reviewed and opportunities for a paradigm shift to PIML are discussed, thereby identifying relevant future research directions.
TL;DR: In this paper, the authors proposed a model for high-temperature fretting fatigue life prediction of dovetail structure of aero-engine compressor, which is based on the circular flat contact theory and continuous damage mechanics theory.
TL;DR: In this paper, the authors showed that the hydrate-growth rate in a system containing methylene blue molecules does not necessarily accelerate on increasing the subcooling temperature, and they proposed that these amorphous clusters act as mass transfer barriers disturbing the agglomeration of solutes.
TL;DR: In this paper, the coordination environment of single-atom catalysts (SACs) was fine-tuned by using glutamic acid as the N/C source and pyrolysis atmosphere as a regulator.
Abstract: Fine-tuning of the coordination environment of single-atom catalysts (SACs) is effective to optimize their catalytic performances, yet it remains challenging due to the vulnerability of SACs. Herein, we report a new approach to engineering the coordination environment of M-N-C (M = Fe, Co, and Ni) SACs by using glutamic acid as the N/C source and pyrolysis atmosphere as a regulator. Compared with that in N2, NH3 was able to promote the doping of N at T < 700 °C yet etch the N-species at higher temperatures, by which the M-N coordination number (CN) and the electronic structure were delicately tuned. It was found that the electron density of Ni single atoms increased with the decrease of Ni-N CN. As a consequence, the capability of Ni-N-C to dissociate H2 was greatly enhanced and a higher catalytic activity in chemoselective hydrogenation of functionalized nitroarenes was achieved. Moreover, this modulation method could be applied to other transition metals including Fe and Co. In particular, the as-synthesized Co-N-C SAC afforded a turnover frequency of 152.3 h−1 with 99% selectivity to 3-vinylaniline in the hydrogenation of 3-nitrostyrene, which was the highest ever reported thus far and was at least one order of magnitude more active than state-of-the-art noble-metal-free M-N-C catalysts, demonstrating the great potential of engineering the coordination environment of SACs.
TL;DR: In this article, an adaptive decentralized asymptotic tracking control scheme is developed for a class of large-scale nonlinear systems with unknown strong interconnections, unknown time-varying parameters, and disturbances.
Abstract: An adaptive decentralized asymptotic tracking control scheme is developed in this paper for a class of large-scale nonlinear systems with unknown strong interconnections, unknown time-varying parameters, and disturbances. First, by employing the intrinsic properties of Gaussian functions for the interconnection terms for the first time, all extra signals in the framework of decentralized control are filtered out, thereby removing all additional assumptions imposed on the interconnections, such as upper bounding functions and matching conditions. Second, by introducing two integral bounded functions, asymptotic tracking control is realized. Moreover, the nonlinear filters with the compensation terms are introduced to circumvent the issue of “explosion of complexity”. It is shown that all the closed-loop signals are bounded and the tracking errors converge to zero asymptotically. In the end, a simulation example is carried out to demonstrate the effectiveness of the proposed approach.
TL;DR: In this article, β-Mo2C was employed as an effective component to activate CO2 and collaborated with Ni/γ-Al2O3 for the dry reforming of methane (DRM) reaction to occur at low temperatures.
Abstract: Non-thermal plasma (NTP) coupled with catalysis provides a way to enable the dry reforming of methane (DRM) reaction to occur at low temperatures. While assistance of NTP brings the negative issue of coke deposition due to the faster rate of CH4 dissociation induced by NTP. Herein, β-Mo2C was employed as an effective component to activate CO2 and collaborated with Ni/γ-Al2O3 for the plasma-assisted DRM reaction. Addition of β-Mo2C facilitated the charge deposition, and Ni nanoparticles were found to re-disperse over the β-Mo2C surface due to the strong interaction between Ni and β-Mo2C. Benefiting from the new active interface of Ni-Mo2C, the mechanically mixed Mo2C-Ni/Al2O3 catalyst exhibited much better activity and stability as compared with the undoped Ni/Al2O3 catalyst. The present study reveals the crucial roles of β-Mo2C additives, providing practical solutions to depress carbon deposition, and thereby enhance the catalytic stability in plasma-assisted DRM reaction.
TL;DR: In this paper, the authors provide an overview of the application of machine learning in electrocatalyst design, including the prediction of structure, thermodynamic properties and kinetic barriers, and discuss the potential of explicit solvent model combined with machine learning molecular dynamics in this field.
TL;DR: In this article, the fundamental and technological development of photocatalytic fuel cell (PFC) is discussed with special attention to novel cell configurations with better visible-light photoelectrodes, innovative cell designs, dual-photoelectrode setup, as well as optimal control.
TL;DR: In this article , the authors provide an overview of the application of machine learning in electrocatalyst design, including the prediction of structure, thermodynamic properties and kinetic barriers, and discuss the potential of explicit solvent model combined with machine learning molecular dynamics in this field.
TL;DR: In this article , a method considering the effect of ambient water on the surface penetration needs to be established urgently, and a methodology to determine the penetration resistance factors for surface marine soils was established.
Abstract: Rapid advances in deep-sea mining engineering have created an urgent need for the accurate evaluation of the undrained strength of marine soils, especially surface soils. Significant achievements have been made using full-flow penetration penetrometers to evaluate marine soil strength in the deep penetration; however, a method considering the effect of ambient water on the surface penetration needs to be established urgently. In this study, penetrometers with multiple probes were developed and used to conduct centrifuge experiments on South China Sea soil and kaolin clay. First, the forces on the probes throughout the penetration process were systematically analyzed and quantified. Second, the spatial influence zone was determined by capturing the resistance changes and sample crack development, and the penetration depth for a sample to reach a stable failure mode was given. Third, the vane shear strength was used to invert the penetration resistance factor of the ball and determine the range of the penetration resistance factor values. Furthermore, a methodology to determine the penetration resistance factors for surface marine soils was established. Finally, the effect of the water cavity above various probes in the surface penetration was used to formulate an internal mechanism for variations in the penetration resistance factor.
TL;DR: In this paper, a covalently cross-linked PBI network using commercially available 2,6-bis(hydroxymethyl)-4-methylphenol (BHMP) as cross-linking agent through a well-established film-forming process was proposed.
TL;DR: In this article, the phthalates were detected in all the samples with total levels ranging from 115-ng/g to 37,700 ng/g, and the estimated daily intakes (EDI) of the PHthalates from the masks ranged from 3.71 to 639 ngh/kg-bw/day, while the EDI of the masks for toddlers were approximately 4-5 times higher than those for adults.
TL;DR: In this article , twelve phthalates were determined in 56 mask samples collected from different countries, with total levels ranging from 115 ng/g to 37,700 ng/g.
TL;DR: In this article, the microstructure and mechanical properties of refractory high-entropy alloys (RHEAs) were studied, and both as-cast and annealed RHEAs consisted of disordered body-centered cubic solid solution phase and metal carbide (MC) phase with a face centered cubic crystal structure (Fm-3m space group).
TL;DR: In this paper, a novel protocol of efficiently separating both synthetic and real oil nano-emulsions via specially designed robust zirconia membranes is presented. But the method is not suitable for real degreasing wastewater with very high oil content and pH (∼12.4).