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Structural design and controllable preparation of SiC NWs@Fe_(3)O_(4)@NC nanocomposites for electromagnetic wave absorption

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 520-533页

作者： Wenxin Zhao Meng Zhang Yukun Miao Chang wang Anguo Cui Liying Yuan Zeqing Miao xiaoqing wang Zhibo wang Haoyu Pang Alan Meng Zhenjiang Li Ting wang College of Materials Science and Engineering Qingdao University of Science and TechnologyQingdao 266042China Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-Materials College of Electromechanical EngineeringQingdao University of Science and TechnologyQingdao 266061China Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOEShandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266042China

Using SiC nanowires(SiCNWs)as the substrate,reflux-annealing and electrodeposition-carbonization were sequentially applied to integrate SiC nanowires with magnetic Fe_(3)O_(4) nanoparticles and amorphous nitrogen-doped carbon(NC)for the fabrication of SiCNWs@Fe_(3)O_(4)@NC *** testing and characterization of this product provided valuable insights into the im-pact of structural and composition changes on its electromagnetic wave absorption *** optimized SiCNWs@Fe_(3)O_(4)@NC nanocomposite,which has 30wt%filler content and a corresponding thickness of 2.03 mm,demonstrates exceptional performance with the minimum reflection loss(RL_(min))of-53.69 dB at 11.04 GHz and effective absorption bandwidth(EAB)of 4.4 *** synergistic effects of the enhanced nanocomposite on electromagnetic wave absorption were thoroughly elucidated using the theories of multiple scattering,polarization relaxation,hysteresis loss,and eddy current ***,a multicomponent electromagnetic wave attenu-ation model was established,providing valuable insight into the design of novel absorbing materials and the enhancement of their absorp-tion *** research demonstrated the significant potential of the SiCNWs@Fe_(3)O_(4)@NC nanocomposite as a highly efficient electromagnetic wave-absorbing material with potential applications in various fields,such as stealth technology and microwave absorption.

关键词： electromagnetic attenuation mechanism multicomponent nanocomposite SiC nanowires structural design

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Triaxial compression behavior of large-scale jointed coal: a numerical study

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International Journal of Coal Science & Technology 2022年第5期9卷 81-95页

作者： xiaoqing wang Fuqiang Gao CCTEG Coal Mining Research Institute BeijingChina Mining&Designing Branch China Coal Research InstituteBeijingChina State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute) BeijingChina

Accurate estimation of the triaxial compression behavior of jointed coal is essential for coal *** studies addressed the triaxial compression behavior of large-scale rock mass,especially with real joint *** employed a numerical synthetic rock mass(SRM)method to study the triaxial compression behavior of jointed ***-coal specimens were constructed based on in-situ joint measurements and microparameter calibration against laboratory experiments.A series of triaxial compression tests under different loading orientations and confining pressures were numerically performed to obtain joint and confining-pressure effects on the triaxial compression behavior and reveal the failure mechanism of jointed *** suggest that the triaxial compression behavior of the jointed coal has strong joint and confining-pressure *** weaken the strength and elastic modulus,reduce the lateral deformation,and affect the geometries of the shear-rupture *** increase in the confining pressure causes the peak and residual strength increase *** an increase in the confining pressure,the elastic modulus increases sharply at low confining pressure,the mechanical behavior transitions from brittleness to ductility,the failure mode transitions from shear-rupture surface to plastic flow,and the joint effect diminishes and even *** jointed coal fails by means of a shear-rupture surface under triaxial compression loading with a confining pressure(which is not too high),and the geometries of the shear-rupture surface vary with the distribution of joints.

关键词： Jointed coal Triaxial compression Synthetic rock mass Failure mode

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N-酰基高丝氨酸内酯降解菌的筛选及其群体感应淬灭活性研究

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食品工业科技 2025年第2期46卷 159-166页

作者：檀茜倩王晓晴崔方超王当丰吕欣然李学鹏励建荣渤海大学食品科学与工程学院/海洋研究院辽宁锦州121013 天津科技大学食品科学与工程学院天津300457

为了研究土壤中具有群体感应淬灭作用的细菌类型以及其群体感应淬灭活性,本研究对土壤中可降解蜂房哈夫尼菌(Hafnia alvei)所产N-酰基高丝氨酸内酯的菌株进行了筛选、分离和鉴定,对群体感应淬灭菌的特性以及其对蜂房哈夫尼菌生物被膜的... 详细信息

为了研究土壤中具有群体感应淬灭作用的细菌类型以及其群体感应淬灭活性,本研究对土壤中可降解蜂房哈夫尼菌(Hafnia alvei)所产N-酰基高丝氨酸内酯的菌株进行了筛选、分离和鉴定,对群体感应淬灭菌的特性以及其对蜂房哈夫尼菌生物被膜的抑制和清除能力进行了分析,并通过特异性引物扩增判断菌株可能产群体感应淬灭酶类型。共从土壤中分离到4株对蜂房哈夫尼菌所分泌的群体感应信号分子具有较高降解活性的细菌,经鉴定分别为霍氏肠杆菌(Enterobacteri hormaechei)GS31、蜡样芽孢杆菌(Bacillus cereus)GS44、苏云金芽孢杆菌(Bacillus thuringiensis)GS48和沙雷氏菌(Serratia sp.)GS53;其中霍氏肠杆菌GS31的淬灭活性最强,其次为沙雷氏菌GS53、蜡样芽孢杆菌GS44和苏云金芽孢杆菌GS48。霍氏肠杆菌GS31和沙雷氏菌GS53的潜在群体感应淬灭活性物质存在无细胞上清液中(Cell-free supernatant,CFS),而蜡样芽孢杆菌GS44和苏云金芽孢杆菌GS48存在于细胞破碎提取物(Crude cell extract,CCE)中;结合结晶紫染色和光学显微镜分析结果发现,所分离的菌株具有不同程度的抑制和清除蜂房哈夫尼菌生物被膜能力,其中霍氏肠杆菌GS31的抑制率和清除率最高,分别为42.9%和53.0%。同源基因扩增结果表明,霍氏肠杆菌GS31、蜡样芽孢杆菌GS44、沙雷氏菌GS53中可能存在AiiA内酯酶和PvdQ酰化酶基因,苏云金芽孢杆菌GS48中可能存在AiiA内酯酶基因。通过对土壤中可降解N-酰基高丝氨酸内酯菌株的筛选及其群体感应淬灭活性研究,为进一步丰富群体感应淬灭菌资源,以及基于群体感应淬灭菌的水产保鲜剂的开发奠定了基础。

关键词： N-酰基高丝氨酸内酯群体感应群体感应淬灭生物被膜蜂房哈夫尼菌

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加热模式对Cu-Al微电阻点焊过程中电极烧损行为的影响

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材料导报 2025年第4期39卷 118-126页

作者：张志春王晓庆吴明海杨凯贵州大学现代制造技术教育部重点实验室贵阳550025

为了明确微电子封装Cu-Al引线键合工艺中加热模式对微电阻点焊电极烧损行为及焊接接头性能的影响,分别开展了单极性和双极性加热模式下微电阻点焊电极的全生命周期连续焊接和分阶段焊接试验。基于试验过程中电极的电、热和几何物理特性... 详细信息

为了明确微电子封装Cu-Al引线键合工艺中加热模式对微电阻点焊电极烧损行为及焊接接头性能的影响,分别开展了单极性和双极性加热模式下微电阻点焊电极的全生命周期连续焊接和分阶段焊接试验。基于试验过程中电极的电、热和几何物理特性以及焊接接头的形貌和拉剪力,阐述了连续焊接过程中在不同加热模式下电极的烧损规律,定量表征了分阶段焊接过程中在不同加热模式下各焊接阶段电极的烧损量,探究了在不同加热模式下电极烧损对焊接接头性能的影响,分析了在不同加热模式下电极的失效机理。结果表明,双极性加热模式能有效延长电极使用寿命、改善焊接接头表面质量及提高焊接接头拉剪强度;两种加热模式下电极的全生命周期连续烧损均呈现初始烧损、稳定烧损和剧烈烧损三个时期;在双极性加热模式下电极各焊接阶段的烧损量均小于单极性加热模式;疲劳裂纹、表层剥离、熔滴溅射、再结晶、晶粒长大及熔化是两种加热模式下电极的主要失效形式,高温氧化、热应力循环及瞬态热冲击是电极失效的主要原因。

关键词：微电阻点焊电极加热模式烧损规律失效机理接头性能

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Structure and red emissions of Eu^(3+)-doped hydrocalumite prepared in ethanol/water media

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Journal of Rare Earths 2019年第1期37卷 45-51,M0003页

作者： Kunlei Zhang Yufeng Chen xiaoqing wang Li wang College of Chemistry Nanchang University College of Materials Science and Engineering Nanchang University

Eu^(3+)-doped hydrocalumites (Eu^(3+)-doped CaAl-LDH) were prepared in an ethanol/water media. Various techniques, including inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray diffraction (XRD), and fluorescent spetctra (FL), etc., were employed to study the structure, composition,and fluorescence of samples. Compositional analyses reveal that the contents of all the elements calculated from the chemical formula are close to that of the actual found from measurement. XRD results suggest that the samples with different molar ratios of Ca^(2+)/(Al^(3+)+Eu^(3+)) present typical layered structure. Moreover, all the samples exhibit monoclinic structure. Fluorescent spectra show strong red emissions ascribed to^5D_0→~7F_J(J=1, 2) transitions of Eu3+ions for all the Eu^(3+)-doped hydrocalumites,revealing that the hydrocalumite is favorable for the emission of Eu^(3+). The Eu^(3+)-doped hydrocalumite may be a latent fluorescent material applied in biological or medical fields in consideration of the biocompatibility of Ca^(2+) ions and fluorescent property of Eu^(3+) ions.

关键词： Hydrocalumite Eu^3+ dopant Red emissions Rare earths

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Five-CpG-based prognostic signature for predicting survival in hepatocellular carcinoma patients

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Cancer Biology & Medicine 2018年第4期15卷 425-433页

作者： Feng Fang xiaoqing wang Tianqiang Song Department of Hepatobiliary Cancer Tianjin Medical University Cancer Institute and Hospital National Clinical Research Center for Cancer Key Laboratory of Cancer Prevention and Therapy Tianjin Tianjin's Clinical Research Center for Cancer

Objective:Hepatocellular carcinoma(HCC)is a common malignancy associated with high morbidity and mortality rates *** diagnosis plays an important role in the improvement of HCC ***:In this study,we conducted a comprehensive analysis of HCC DNA methylation and gene expression datasets in The Cancer Genome Atlas(TCGA),to identify a prognostic signature for HCC diagnosis and survival ***,we identified differential methylation CpG(dmCpG)sites in HCC samples and compared them with those in adjacent normal liver tissues;this was followed by univariate analysis and Sure Independence Screening(SIS)in the training *** robustness of the identified prognostic signature was evaluated using the testing *** explore the biological processes involved in HCC progression,we also performed functional enrichment analysis for overlapping genes between genes containing dmCpG sites(DMGs)and differential expression genes(DEGs)in HCC patients,using data from the Database for Annotation,Visualization,and Integrated Discovery(DAVID).Results:As a result,we identified five CpG sites that were significantly associated with HCC survival through univariate analysis and *** analysis of clinical characteristics identified age and risk factors(including alcohol consumption and smoking)as independent factors that indicated HCC *** analysis indicated that the integrated prognostic signature(weighted combination of the five CpG sites)that took age and risk factors into consideration resulted in more accurate survival ***:This study provides a novel signature for predicting HCC survival,and should be helpful for early HCC diagnosis and personalized treatment.

关键词： Hepatocellular carcinoma methylation prognosis prognostic signature TCGA

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High sidelobe effects on interferometric coherence for circular SAR imaging geometry

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Journal of Systems Engineering and Electronics 2013年第1期24卷 76-83页

作者： Leilei Kou xiaoqing wang Maosheng Xiang Minhui Zhu School of Atmospheric Physics Nanjing University of Information Science and Technology Institute of Electronics Chinese Academy of Sciences

The coherence is a measure for the accuracy of the interferometric phase, and the synthetic aperture radar （SAR） inter- ferometric coherence is affected by several sources of the decor- relation noise. For the circular SAR （CSAR） imaging geometry, the system response function is in the form of the Bessel function which brings a high sidelobe, and the high sidelobe of CSAR will be an important factor influencing the interferometric coherence. The effect of the high sidelobe on the coherence is analyzed and deduced. Based on the interferometric characteristics of the slight difference in the viewing angles and the potential pixel off- set in the interferometric SAR （InSAR） images, a relation between the radar impulse response and the coherence loss function is derived. From the relational model, the coherence loss function due to the high sidelobe of CSAR is then deduced, and compared with that of the conventional SAR. It is shown that the high sidelobe of CSAR focusing signal will severely affect the baseline decorre- lation and coregistration decorrelation. Simulation results confirm the theoretical analysis and quantitatively show the baseline and coregistration decorrelation degradation due to the high sidelobes of CSAR.

关键词： interferometric coherence circular SAR (CSAR) high sidelobe interferometric SAR (InSAR) baseline decorrelation coregistration decorrelation.

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Multi-color luminescence in Eu^3＋/Tb^3＋ co-doped ZnAl amorphous materials and their annealed samples

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Journal of Rare Earths 2018年第11期36卷 1141-1149页

作者： Yufeng Chen Jiwan Zhang Yanmei Hu xiaoqing wang Li wang College of Chemistry Nanchang University Nanchang 330031 China College of Materials Science and Engineering Nanchang University Nanchang 330031 China

Multi-color luminescence basing on amorphous Eu^3＋/Tb^3＋ co-doped Zn-A1 hydroxides and their annealed samples were studied in detail. Results suggest that excellent red emissions due to E^u3＋ and green emissions attributed to Tb^3＋ appear under the excitation of favorable wavelength for all the as- prepared amorphous samples. Moreover, the emission intensity depends on the Eu^3＋/Tb^3＋ molar ratio. The samples annealed at 300, 500, and 700 ℃ still exhibit amorphous state, and multi-color lumi- nescence kept in the samples annealed at 300 ℃, while luminescence quenched for the samples annealed at 500 and 700 ℃. However, a broad emission ranging from 450 to 650 nm occurs in some samples annealed at 900 ℃. Further, the fluorescence decay and lifetimes for the as-prepared samples and the samples annealed at 300℃ were investigated. It is found that all the decay curves of emissions due to Tb^3＋ and Eu^3＋ present characteristic double exponential function despite their different lifetimes. The present work may be a good example for developing new multi-color even white light emitting materials.

关键词： Eu^3+/Tb^3+ -dopant Multi-color luminescence Fluorescence decay Amorphous solid Rare earths

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Aggregation-amplified circularly polarized luminescence from axial chiral boron difluoride complexes

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Science China Chemistry 2019年第3期62卷 355-362页

作者： Zhiyong Jiang xiaoqing wang Jianping Ma Zhipeng Liu Key Laboratory of Flexible Electronics Institute of Advanced Materials Nanjing Tech University Institute of Advanced Synthesis School of Chemistry and Molecular Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University School of Chemistry & Cheimcal Engineering and Materials Science Shandong Normal University

The development of small organic molecules with intense and switchable circularly polarized luminescence(CPL) is currently attracting great interest due to their promising applications in chiroptical devices and sensors. In this paper, CPL-active BF2-bridged azaanthracene dimers(BA1 and BA2) were facilely synthesized by incorporating boron difluoride unit to the binaphthalene. BA1 and BA2 show moderate CPL in diluted solutions, however, BA2 exhibited aggregation-amplified red CPL with large dissymmetry factor up to 1.6×10^(-2). Moreover, acid-/base-triggered CPL switch off/on were also realized via disaggregation/aggregation of BA2 in tetrahydrofuran(THF)/water binary solvents.

关键词： aggregation-induced emission bodipy circularly polarized luminescence dyes and pigments switch

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CO_2/CH_4 and CH_4/N_2 separation on isomeric metal organic frameworks

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Chinese Journal of Chemical Engineering 2016年第12期24卷 1687-1694页

作者： xiaoqing wang Libo Li Jiangfeng Yang Jinping Li Research Institute of special Chemicals Taiyuan University of Technology Taiyuan 030024 China

Two isomeric metal-organic frameworks(MOFs) with 2-dimensional(2D) and 3-dimensional(3D) topologies both comprised of Cu(Ⅱ) and OTf(OTf = trifluoromethanesulfonate) ions were synthesized and *** CO_2,CH_4 and N_2 adsorption properties of the two isomeric MOFs were investigated from 263 K to 298 K at0.1 *** results showed that the 2D MOF exhibited a higher selectivity for CO_2 from CO_2/CH_4 and CH_4from CH_4/N_2 compared to the 3D MOF,even though it possessed a lower surface area and pore *** higher adsorption heats of gases on the 2D MOF inferred the strong adsorption potential energy in the layered *** separation experiments using CO_2/CH_4 and CH_4/N_2 mixtures on the two MOFs proved that the2 D MOF had a longer elution time than the 3D MOF as well as better separation abilities.

关键词： Metal–organic frameworks Isomeric frameworks Adsorption Separation

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