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Progress in Natural Science:Materials International 2020年第4期30卷 469-476页

作者： Chao Zhang Dongjin Sun Yuchun Huan Kaidi Wu Hanlin Liao College of Mechanical Engineering Yangzhou University icb umr 6303 CNRS Univ.Bourgogne Franche-Comté

This paper presents a NO2sensor operating at low temperature, which was fabricated by ZnO nanoparticlesloaded In2O3hollow microspheres composites. SEM, XRD, XPS and HRTEM were executed to determine the morphology and microstructure of ZnO–In2O3. The sensing performance of pure In2O3and ZnO–In2O3composite sensors was tested. The NO2sensing properties of the composite were greatly improved in contrast with the pure In2O3sensor at the optimized operating temperature（75 °C）. ZnO–In2O3composite sensor exhibited an obviously higher response（805.2 for 100 ppb NO2） than that of the pure In2O3sensor（14 for 100 ppb NO2）. In particular, the response/recovery rate of ZnO–In2O3composite sensor was greatly improved in contrast with the pure In2O3sensor. The n-n heterojunctions created at ZnO–In2O3interfaces improved the sensing performance.

关键词： ZnO-In 2 O 3 Hollow microspheres Gas sensor NO 2 sensor Low operating temperature

Smart lasers tame complex spatiotemporal cavity dynamics

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Light(Science & Applications) 2020年第1期9卷 181-183页

作者： Philippe Grelu Laboratoire icb umr 6303 cnrs Universite Bourgogne-Franche-Comte21000 DijonFrance

By associating multimode fibers,optical wavefront manipulation,and a feedback loop controlled by a genetic algorithm,researchers have demonstrated that nonlinear spatiotemporal dynamics can be flexed within the laser cavity to achieve a user-specified objective,such as the lasing wavelength,output power,beam profile or pulsed operation.

关键词： cavity dynamics lasing

Central role of altered phosphodiesterase 2-dependent signaling in the pathophysiology of cognition-based brain disorders

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Neural Regeneration Research 2025年第8期20卷 2302-2303页

作者： Asma Boulksibat Alessandra Tempio Barbara Bardoni Institut de Pharmacologie Moléculaire et Cellulaire CNRS UMR7275Inserm U1323ValbonneFrance

The second messengers 3',5'-cyclic adenosine monophosphate(cAMP)and 3',5'-cyclic guanosine monophosphate(cGMP)modulate molecular pathways that are involved in a large variety of cellular *** the brain,these processes include neurogenesis,neuronal differentiation,activation and function of microglia,and synaptic plasticity,finally resulting in memory formation.

关键词： formation processes finally

Combining infrared and mode synthesizing atomic force microscopy： Application to the study of lipid vesicles inside Streptomyces bacteria

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Nano Research 2016年第6期9卷 1674-1681页

作者： Pauline Vitry Rolando Rebois Eric Bourillot Ariane Deniset-Besseau Marie-Joelle Virolle~ Eric Lesniewska Alexandre Dazzi icb umr cnrs 6303 University ofBourgogne Franche Comte 21078 Dijon France LCP umr cnrs 8000 University Paris-Sud 91405 Orsay France 12BC umr cnrs 9198 University Paris-Sud 91190 Gif-Sur-Yvette France

We propose a new analytical approach combining vibrational spectroscopy and acoustic tomography for the detection and characterization of vesicles inside Streptomyces bacteria. Using atomic force microscopy and infrared spectroscopy （AFM-IR）, we detect the presence of triglyceride vesicles. Their sizes in depth are measured with high accuracy using mode synthesizing atomic force microscopy （MS-AFM）. We conducted a comparative study of AFM-IR and MS-AFM, and highlighted the advantages of the coupling of these techniques in having a full characterization （chemical, topographical, and volumetric） of a biological sample. With these complementary techniques, a complete access to the vesicle size distribution has been achieved with an accuracy of less than 50 nm. A 3D reconstruction of bacteria showing the in-depth distribution of vesicles is given to underline the great potential of the acoustic method.

关键词： nanoscale suDsurtace imaging atomic force microscop~ acoustic microscopy infrared microscopy biology

Preparation of ZnO_(1-x) by peroxide thermal decomposition and its room temperature gas sensing properties

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Rare Metals 2022年第3期41卷 871-876页

作者： Chao Zhang Ying Li Gui-Fang Liu Han-Lin Liao College of Mechanical Engineering Yangzhou UniversityYangzhou 225127China icb umr 6303 CNRSUniversity Bourgogne Franche-ComtéUTBMBelfort 90010France

The excessive concentration of NO_(2) in the atmosphere has gained considerable attention due to its damage to the environment and human health. Gas sensor technology has important application prospects in detecting atmospheric NO_(2) concentration. Restricted by its wide bandgap, pristine ZnO needs additional energy to power the electronic transition as a gas sensing material.

关键词： Restricted gained damage

In-situ formation of Ni-Al intermetallics-coated graphite/Al composite in a cold-sprayed coating and its high temperature tribological behaviors

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Journal of Materials Science & Technology 2017年第6期33卷 507-515页

作者： Chunjie Huang Wenya Li Marie-Pierre Planche Hanlin Liao Ghislain Montavon icb umr 6303 CNRS Univ.Bourgogne Franche-ComtéUTBM State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University

In this study, cold spraying（CS） was used to deposit a mixture of nickel-coated graphite and 40 vol.% Al powder（Ni-Gr/Al） on a steel substrate aiming to effectively preserve a certain volume fraction of graphite in the deposited Ni-Gr/Al composite coating. The microstructure of the as-sprayed coating and the effect of post-spray heat-treatment（PSHT） temperatures on the in-situ formation of Ni-Al intermetallic phases in coating were studied. The tribological behaviors of the as-sprayed coating and the PSHTed coating under 450？C were tested at 25？C, while the as-sprayed coating was tested at 450？C for *** a result, the Ni-Gr particles showed a homogenous distribution in the coating. The multilayer Ni-Al intermetallics-coated graphite/Al composite coating was achieved in situ after the PSHT of 450？C, where the graphite did decompose at 550？C leaving big pores in the coating. The coefficients of friction（COF）of the CSed coating and the PSHTed coating were measured at 450？C as well as 25？C, which showed a similar tendency, much higher than that of the CSed coating tested at 25？C. The lubrication phase（graphite） improved the formation of a graphite film during sliding friction and decreased the COF, while the hard Ni-Al intermetallic phases contributed to the increase of COF.

关键词： Cold spraying Ni-coated graphite powder Post-spray heat-treatment Intermetallics Tribological performance

MARIE:One-Stage Object Detection Mechanism for Real-Time Identifying of Firearms

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 279-298页

作者： Diana Abi-Nader Hassan Harb Ali Jaber Ali Mansour Christophe Osswald Nour Mostafa Chamseddine Zaki Computer Science Department Faculty of SciencesLebanese UniversityBeirut146404Lebanon College of Engineering and Technology American University of the Middle EastEgaila54200Kuwait Lab-STICC CNRS UMR 6285ENSTA-BretagneBrest29200France

Security and safety remain paramount concerns for both governments and individuals *** today’s context,the frequency of crimes and terrorist attacks is alarmingly increasing,becoming increasingly intolerable to ***,there is a pressing need for swift identification of potential threats to preemptively alert law enforcement and security forces,thereby preventing potential attacks or violent *** advancements in big data analytics and deep learning have significantly enhanced the capabilities of computer vision in object detection,particularly in identifying *** paper introduces a novel automatic firearm detection surveillance system,utilizing a one-stage detection approach named MARIE(Mechanism for Realtime Identification of Firearms).MARIE incorporates the Single Shot Multibox Detector(SSD)model,which has been specifically optimized to balance the speed-accuracy trade-off critical in firearm detection *** SSD model was further refined by integrating MobileNetV2 and InceptionV2 architectures for superior feature extraction *** experimental results demonstrate that this modified SSD configuration provides highly satisfactory performance,surpassing existing methods trained on the same dataset in terms of the critical speedaccuracy *** these innovations,MARIE sets a new standard in surveillance technology,offering a robust solution to enhance public safety effectively.

关键词： Firearm and gun detection single shot multi-box detector deep learning one-stage detector MobileNet inception convolutional neural network

Dispersion-less Kerr solitons in spectrally confined optical cavities

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Light(Science & Applications) 2023年第1期12卷 136-146页

作者： Xiaoxiao Xue Philippe Grelu Bofan Yang Mian Wang Shangyuan Li Xiaoping Zheng Bingkun Zhou Department of Electronic Engineering Beijing National Research Center for Information Science and TechnologyTsinghua University100084 BeijingChina Laboratoire icb UMR 6303 CNRSUniversitéBourgogne Franche-Comté21000 DijonFrance

Solitons are self-reinforcing localized wave packets that manifest in the major areas of nonlinear science,from optics to biology and Bose-Einstein ***,optically driven dissipative solitons have attracted great attention for the implementation of the chip-scale frequency combs that are decisive for communications,spectroscopy,neural computing,and quantum information *** the current understanding,the generation of temporal solitons involves the chromatic dispersion as a key enabling physical effect,acting either globally or locally on the cavity dynamics in a decisive ***,we report on a novel class of solitons,both theoretically and experimentally,which builds up in spectrally confined optical cavities when dispersion is practically absent,both globally and ***,the interplay between the Kerr nonlinearity and spectral filtering results in an infiinite hierarchy of eigenfunctions which,combined with optical gain,allow for the generation of stable dispersion-less dissipative solitons in a previously unexplored *** the filter order tends to infinity,we find an unexpected link between dissipative and conservative solitons,in the form of Nyquist-pulse-like solitons endowed with an ultra-flat *** contrast to the conventional dispersion-enabled nonlinear Schr?dinger solitons,these dispersion-less Nyquist solitons build on a fully confined spectrum and their energy scaling is not constrained by the pulse ***-less soliton molecules and their deterministic transitioning to single solitons are also *** findings broaden the fundamental scope of the dissipative soliton paradigm and open new avenues for generating soliton pulses and frequency combs endowed with unprecedented temporal and spectral features.

关键词： solitons soliton confined

Relaxor behaviour and phase transition of perovskite ferroelectrics-type complex oxides(1–x)Na_(0.5)Bi_(0.5)TiO_3–xCaTiO_3 system

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Journal of Advanced Ceramics 2018年第2期7卷 124-142页

作者： Roy ROUKOS Nissrine ZAITER Denis CHAUMONT Laboratoire Interdisciplinaire Carnot de Bourgogne umr 6303 cnrs Université de Bourgogne

Polycrystalline powders of (1–x)Na_(0.5)Bi_(0.5)TiO_3–xCaTiO_3 ((1–x)NBT–xCT, 0 ≤ x ≤ 0.55) have been synthesized by solid state route. The effects of simultaneous substitution of Na^+/Bi^(3+) at A-site in NBT on structural and dielectric properties were investigated. X-ray diffraction analysis revealed the phase transition from rhombohedral structure(x = 0) to orthorhombic structure(x ≥0.15). A distinct behaviour in dielectric properties was obtained, where for x = 0, a normal ferroelectric behaviour was observed, whereas for x ≥ 0.15, a broad dielectric anomaly was revealed such that the maximum temperature(T_m) strongly depended on the frequency and shifted towards low temperature with CT. The dielectric dispersion indicated a relaxor behaviour revealed by the degree of diffuseness and modelled via Vogel–Fulcher relation. The study highlighted the relaxor behaviour as a function of frequency and proved the transformation from a relaxor high-frequency dependence to a paraelectric phase at temperature T_s. The distinct variation of the Raman spectra at room temperature was correlated with X-ray diffraction results and proved the already mentioned transition. On heating(-193–500 ℃), the Raman spectra confirmed the structural stability(Pnma) of the materials. The phonon behaviour for x = 0.15 was discussed in terms of the appearance of polar nanoregions(PNRs) into a non-polar orthorhombic matrix responsible of the relaxor behaviour. For x = 0.20, unchanged phonon behaviour confirmed the variation in dielectric behaviour where the solids transformed from a relaxor to a paraelectric state without structural phase transition.

关键词： relaxor behaviour dielectric properties Vogel–Fulcher relationship polar nanoregions (PNRs) X-ray diffraction Raman spectroscopy

Effect of Substrate Type on Deposition Behavior and Wear Performance of Ni-Coated Graphite/Al Composite Coatings Deposited by Cold Spraying

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Journal of Materials Science & Technology 2017年第4期33卷 338-346页

作者： Chunjie Huang Wenya Li Yingchun Xie Marie-Pierre Planche Hanlin Liao Ghislain Montavon icb umr 6303 CNRSUniversite Bourgogne Franche-ComteUTBMF-90100 BelfortFrance State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi'an 710072China

This work focused on the deposition characteristics and wear behavior of Ni-coated graphite mixed with40 vol.% Al（Ni-Gr/Al） composite coatings sprayed on an Al alloy and a steel substrate by cold spraying（CS）. The morphology of the flattened Ni-Gr particles was examined by single-impact tests. Crosssectional microstructure and wear performance of the Ni-Gr/Al composite coatings were studied. Results showed that a larger number of Ni-Gr particles were finally bonded with the steel substrate, whereas many craters existed on the Al alloy substrate after the single-impact tests. The coating on the steel substrate had a high thickness, high graphite content and low coeficient of friction（COF） compared to those on the Al alloy substrate. In addition, the CS coatings presented a homogeneous distribution and uniform morphology of graphite, and a comparative COF to that of conventional thermal sprayed coatings. It was shown that CS could avoid the decomposition and transformation of graphite phase.

关键词： Cold spraying Ni-coated graphite Deposition behavior Microstructure Wear performance